JP2010120378A - Vulcanized rubber sheet, composite vulcanized rubber sheet and method of manufacturing them - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vulcanized rubber sheet which permits the bonding of a plurality of sheets while keeping bonding strengths in the lengthwise and widthwise directions by using a press molding without reforming a hot board, to provide a composite vulcanized rubber sheet obtained by bonding the vulcanized rubber sheets to each other, and to provide a method of manufacturing the vulcanized rubber sheet and the composite vulcanized rubber sheet. <P>SOLUTION: The vulcanized rubber sheet 6 has an edge part which is bondable, the edge part includes an unvulcanized belt part 2c containing no vulcanizing agent, and the unvulcanized belt part 2c is bonded to an unvulcanized rubber sheet containing a vulcanizing agent on the edge surface and is vulcanized to produce a belt part having a width serving as vulcanized rubber. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vulcanized rubber sheet, a composite vulcanized rubber sheet, and a method for producing them.

Vulcanized rubber sheets are manufactured by cutting or joining unvulcanized sheets that have been made into sheets with a dispenser such as a calendar or roller head, and then press vulcanizing using a press hot platen. . In this manufacturing method, a sheet having a size within the press hot platen can be manufactured by integral molding, but a sheet larger than the press hot plate used for waterproof sheets, roofing, grass prevention sheets, etc., can be manufactured by integral molding. Absent.
So, for the expansion in the length direction so far, by making a cooling zone at the end of the hot platen, the end of the vulcanized rubber sheet is made into an unvulcanized state and the unvulcanized parts are pressed together in the next step. An integrally molded vulcanized bonded sheet was manufactured by bonding.

In addition, expansion of the vulcanized rubber sheet in the width direction requires modification such as providing a cooling zone on the end face in the width direction of the hot plate, and depending on the size of the required vulcanized rubber sheet, It is necessary to make a special press by remodeling and it is practically difficult to implement industrially.
For this reason, conventionally, after cutting and polishing the ends of the vulcanized rubber sheet and applying the adhesive, the ends of the vulcanized rubber sheet are sandwiched between the unvulcanized sheets (patch sheets) that have been thinly dispensed. A method of manufacturing a rubber sheet having a size exceeding the heating plate by joining is known (Patent Document 1).

  However, in the method of joining between the end portions of the vulcanized rubber sheet, as shown in FIG. 8 which is a partially enlarged view of the joining portion, the joining portion 9 rises to form a step or deform. . If it is molded so that it does not rise, there will be product quality issues such as inability to ensure strength. Further, in manufacturing, it may take time and effort (cutting time) such as cutting / polishing / adhesive application of the joint portion, and the delivery date requested by the user may not be answered.

Japanese Patent Laid-Open No. 10-46758

  The present invention relates to a vulcanized rubber sheet capable of joining a plurality of sheets while maintaining the joining strength in the length and width directions by press molding without remodeling the hot platen, and the composite vulcanization obtained by joining the vulcanized rubber sheets together. The present invention provides a vulcanized rubber sheet and a production method thereof.

  After examining the method of integrating by press molding without remodeling the hot platen, the end of the vulcanized rubber sheet was left unvulcanized without the vulcanizing agent, and between the unvulcanized zone parts The unvulcanized rubber sheet containing the vulcanizing agent is joined to the unvulcanized rubber sheet containing the vulcanizing agent and the unvulcanized belt portions are simultaneously vulcanized and integrated, or end face joining. By applying a vulcanizing agent solution to the uncured zone part of the part and drying it, the unvulcanized band parts are simultaneously vulcanized and integrated to maintain the joint strength in the length and width directions. It has been found that a composite vulcanized rubber sheet that can be joined together is obtained. The present invention has been made based on such findings.

That is, the vulcanized rubber sheet of the present invention is a vulcanized rubber sheet that can join the end portion, the end portion includes an unvulcanized band portion that does not contain a vulcanizing agent, the unvulcanized band portion, The width of the vulcanized rubber becomes a vulcanized rubber by vulcanization by end bonding with an unvulcanized rubber sheet containing a vulcanizing agent or by joining the unvulcanized belt portion with a vulcanizing agent present at the joining portion. It is a belt portion having a length.
Further, the end of the vulcanized rubber sheet including the unvulcanized band portion not containing the vulcanizing agent is characterized in that one sheet surface is vulcanized.

  Further, the composite vulcanized rubber sheet of the present invention is a composite vulcanized rubber sheet obtained by joining at least one end of a plurality of vulcanized rubber sheets, or one end of the vulcanized rubber sheet is joined end-to-end to form a sleeve shape. Or a composite vulcanized rubber sheet having an endless belt shape, wherein the vulcanized rubber sheet is the vulcanized rubber sheet described above, and between the unvulcanized belt portions at the end of the vulcanized rubber sheet, An unvulcanized rubber sheet containing a vulcanizing agent is joined, and the unvulcanized rubber sheet and the unvulcanized belt portions are simultaneously vulcanized and integrated.

  Another composite vulcanized rubber sheet of the present invention is a composite vulcanized rubber sheet obtained by joining at least one end of a plurality of vulcanized rubber sheets, or one end of the vulcanized rubber sheet is end-face joined to form a sleeve shape. Or an endless belt-shaped composite vulcanized rubber sheet, wherein the vulcanized rubber sheet is the vulcanized rubber sheet described above, and the unvulcanized belt portions at the ends of the vulcanized rubber sheet are end-to-face joined. Thus, the unvulcanized band portions of the end surface joint portion are applied and dried, and then the unvulcanized band portions are simultaneously vulcanized and integrated.

In particular, the composite vulcanized rubber sheet of the present invention is characterized in that the thickness of the joint portion obtained by simultaneous vulcanization and integration is the same as the thickness of the vulcanized rubber sheet.
Further, the composite vulcanized rubber sheet is a cloth-containing rubber sheet.

The method for producing a vulcanized rubber sheet of the present invention is a method for producing a vulcanized rubber sheet that includes an unvulcanized band portion that does not contain a vulcanizing agent and that can join the end portions of the unvulcanized band, Bonding the unvulcanized rubber sheet not containing the vulcanizing agent to the end of the unvulcanized rubber sheet containing the agent, and at least one surface of the unvulcanized rubber sheet not containing the vulcanizing agent. The step of covering with a mold film, the unvulcanized rubber sheet containing the vulcanizing agent, and the unvulcanized rubber sheet not containing the vulcanizing agent are simultaneously press vulcanized.
Further, the step of covering at least one surface of the unvulcanized rubber sheet not containing the vulcanizing agent with a release film is a step of covering the surface with the release film and applying and drying the vulcanizing agent solution on the back surface. It is characterized by that.

  A method for producing a composite vulcanized rubber sheet according to the present invention is a method for producing a composite vulcanized rubber sheet by joining the unvulcanized rubber sheets together, wherein the unvulcanized end of the vulcanized rubber sheet is not added. A step of bonding an unvulcanized rubber sheet containing a vulcanizing agent between the vulcanized band portions, and a step of simultaneously vulcanizing and integrating the unvulcanized rubber sheet and the unvulcanized band portions. It is characterized by including.

  Another method for producing the composite vulcanized rubber sheet of the present invention includes the step of joining the unvulcanized band portions of the end portions of the vulcanized rubber sheet to each other, or the step of joining the end portions, and the joint portion of the end surfaces or the end portions. And a step of simultaneously vulcanizing and integrating the unvulcanized band parts after applying and drying the vulcanizing agent solution to the unvulcanized band parts.

  By joining a plurality of the vulcanized rubber sheets of the present invention in the length and width directions by the above-described method, the joint portion is flat and the joint strength can stably ensure a strength higher than that of the vulcanization joint. Further, in the manufacturing process of vulcanization joining, the polishing process of the joining surface that requires the most man-hour is not required, and the man-hour can be greatly reduced.

It is a figure which shows the manufacturing process of a vulcanized rubber sheet. It is a figure which shows the manufacturing process of a composite vulcanized rubber sheet. It is a figure which shows the other shape of an unvulcanized rubber sheet. It is a figure which shows the other form of a composite vulcanized rubber sheet. It is a figure which shows the manufacturing process of the composite vulcanized rubber sheet using a vulcanizing agent solution. It is a figure which shows the manufacturing process of another vulcanized rubber sheet. It is sectional drawing which joins the vulcanized rubber sheets by which the one sheet | seat surface is vulcanized. It is a partial enlarged view of the junction part of a prior art example.

  Rubbers that can be used in the present invention include ethylene propylene rubber (EPDM), nitrile rubber (NBR), natural rubber (NR), styrene butadiene rubber (SBR), isobutylene isoprene rubber (IIR), halogenated IIR, and silicone rubber. It can be selected according to the use of the vulcanized rubber sheet such as waterproof sheet and roofing.

A vulcanizing agent, a vulcanizing aid, a vulcanization accelerator, a vulcanization retarder, an anti-aging agent, a reinforcing agent or a filler, a processing aid or a lubricant, a colorant, and the like are blended and kneaded in a sheet form with the rubber. A vulcanized rubber sheet is obtained by molding and vulcanizing.
The vulcanized rubber sheet of the present invention is the same as the A sheet except that only the vulcanizing agent is removed from the end of an unvulcanized rubber sheet (hereinafter also referred to as A sheet) in which other compounding agents are blended together with the vulcanizing agent. A band-shaped unvulcanized rubber sheet having the same proportion, or a band-shaped unvulcanized rubber sheet (hereinafter also referred to as a B sheet) vulcanized under the same or similar conditions as the A sheet, It can be obtained by press vulcanization.
As long as the A sheet can be vulcanized under the same or similar conditions, a plurality of sheets having the same or different composition may be joined in the width direction. Since the A sheet is an unvulcanized rubber sheet, it can be easily integrated by pressing or the like before vulcanization. For example, an A sheet having a width of 2100 mm and a length of 4200 mm can be produced by pressing two unvulcanized silicone rubber sheets having a width of 1100 mm and a length of 4200 mm in an unvulcanized state by overlapping 10 mm in the width direction. Similarly, different types of rubber sheets can be joined.

  The vulcanizing agent can be selected depending on the rubber material used. A preferable vulcanizing agent is that when the end faces of the A sheet and the end faces of the B sheet are joined and press vulcanized, the vulcanizing agent moves or diffuses from the end face of the A sheet to the end face of the B sheet at the joining face. It is a vulcanizing agent that provides a vulcanized joint surface.

For example, in the case of silicone rubber, ethylene propylene rubber, or brominated butyl rubber as a vulcanizing agent, a peroxide vulcanizing agent such as 2,5 dimethyl-2,5 bis (t-butylperoxy) -hexane. In the case of chlorinated butyl rubber and butyl rubber, a vulcanizing system combining sulfur and a sulfur-based vulcanization accelerator, a resin vulcanizing agent such as a brominated alkylphenol formaldehyde resin, and the like can be given.
By blending these vulcanizing agents, the vulcanizing agent easily migrates or diffuses from the end surface of the A sheet to the end surface of the B sheet at the joint surface.

Further, the blending ratio of the vulcanizing agent can be selected depending on each rubber material and the kind of the vulcanizing agent to be used. Specifically, it is a blending ratio capable of maintaining the characteristics of a normal rubber sheet. The type and ratio of the compounding agent other than the vulcanizing agent are not particularly limited, and can be compounded within a range in which the characteristics of a normal rubber sheet can be maintained. However, as described above, it is preferable that the A sheet and the B sheet have the same type and ratio of other compounding agents excluding the vulcanizing agent. By being the same, a vulcanized rubber sheet that retains the integrity of the A sheet and the B sheet and includes an unvulcanized portion at the end is obtained by press vulcanization after end face joining or end joining.
In the case where physical properties different from those of the A sheet are imparted to the joint, the type and ratio of the blending of the A sheet and the B sheet can be changed.

A method for producing a vulcanized rubber sheet will be described with reference to FIG. 1 (a) to 1 (e) or 6 (a) to 6 (e) are diagrams showing a process for producing a vulcanized rubber sheet including an unvulcanized band portion not including a vulcanizing agent. 1 to 8, the size and thickness of the rubber sheet are partially changed and enlarged for explanation of the joint portion.
Unvulcanized rubber sheet 1 (A sheet) is prepared by kneading rubber with a vulcanizing agent and other compounding agents using a rubber kneader such as a two-roll, Banbury mixer, or dough mixer (kneader). Similarly, an unvulcanized rubber sheet 2 (B sheet) having a composition in which only the vulcanizing agent is removed from the A sheet composition is prepared (FIG. 1A).
The end face 1a of the unvulcanized rubber sheet 1 and the end face 2a of the unvulcanized rubber sheet 2 are cut into similar shapes that can be joined without gaps when the end faces are joined together, and the end faces are pressure-bonded at the joint 3. (FIG. 1 (b)).

Press vulcanization is performed with an unvulcanized rubber sheet having end faces joined between the hot plates 4 and 4 of the press machine (FIG. 1 (c)). Since the unvulcanized rubber sheet 2 may adhere to the hot platen 4 during press vulcanization, the surface of the unvulcanized rubber sheet 2 including the joint 3 is covered with a release film 5. Press vulcanization conditions are selected based on the thickness of the unvulcanized rubber sheet, the type of rubber material, the type and proportion of the compounding agent, the desired size of the vulcanized region 2b of the unvulcanized rubber sheet 2, and the like. To do.
In the vulcanized rubber sheet 6 ′ including the unvulcanized portion 2c ′ taken out from the press, the vulcanized rubber sheet 1b is integrally vulcanized with the vulcanized portion 2b of the B sheet at the joint portion 3 (FIG. 1 (d)).

As another manufacturing method, as shown in FIG. 6, instead of covering the front and back surfaces of the unvulcanized rubber sheet 2 with the release film 5, only the one sheet surface 2 e is covered with the release film 5 and unvulcanized. The vulcanizing agent solution 2d can be applied to the entire surface or a part of the other surface 2f that is the back surface of the rubber sheet 2 and dried after pressurization (FIG. 6C).
Further, the vulcanized rubber sheet 6 ′ is not vulcanized because the vulcanized rubber sheet 1b is integrally vulcanized with the vulcanized portion 2b of the B sheet at the joint 3 and the vulcanizing agent solution 2d is applied. Vulcanization proceeds more than the other surface 2f which is the back surface of the vulcanized rubber sheet 2. Since this vulcanized 2b ′ portion has a relatively higher vulcanizing agent concentration at the joining portion 3 than the tip of the unvulcanized rubber sheet 2, the thickness of the vulcanized portion from the surface becomes thicker, The thickness of the vulcanized portion decreases as it goes in the direction of the tip of the unvulcanized rubber sheet 2 (FIG. 6 (d)).

Vulcanized rubber sheet 6 of the present invention, as the width t ₁ of the pressurized硫部component 2b and the width t ₂ of the unvulcanized硫部component 2c is substantially the length of the same width, and cutting the unvulcanized硫部min 2c ' It is obtained (FIG. 1 (e), FIG. 6 (e)). Preferably, (2c width length t ₂ ) = (2b width length t ₁ ) × (0.6 to 3). Within this range, when an unvulcanized rubber sheet containing a vulcanizing agent is joined between the vulcanized rubber sheets 6, a composite vulcanized rubber sheet is easily obtained. When the width of the unvulcanized part 2c is 0, joining of the vulcanized sheets 6 becomes difficult, and when the width of the unvulcanized part 2c is longer than the width of 2b, the vulcanized rubber sheet 6 is interposed between them. When an unvulcanized rubber sheet containing a vulcanizing agent is joined to the end face, unvulcanized portions are likely to remain during simultaneous vulcanization joining.
The width of the unvulcanized portion 2c ′ can be easily determined and measured based on the presence / absence of rubber elasticity, tear resistance, solubility in a rubber solvent, and the like.
1 and FIG. 6, the example in which the unvulcanized rubber sheet is provided on one end face of the vulcanized rubber sheet 6 has been described. However, the end face of the unvulcanized rubber sheet is joined to the other end face at the same time. By performing press vulcanization, for example, unvulcanized rubber sheet portions can also be provided on the four end surfaces of the vulcanized rubber sheet 6.
Moreover, the vulcanized rubber sheet 6 can be made into a cloth-filled sheet as required.
The vulcanized rubber sheet 6 shown in FIG. 6 (e) is an example of a vulcanized rubber sheet in which one sheet surface at the end of the unvulcanized rubber sheet is vulcanized.

The length of the width t ₂ of the unvulcanized portion 2c of the vulcanized rubber sheet 6 is (when the vulcanized rubber sheet 6 is joined by a vulcanizing agent solution, which will be described later) (2b width length t ₁ ). It is preferable that it is x0.6 or more. Even longer the length of the width t ₂ of 2c progresses vulcanization of unvulcanized硫帯part by simultaneously vulcanized after coating and drying the whole between unvulcanized硫帯portions vulcanizing agent solution.
Further, in the vulcanized rubber sheet 6 shown in FIG. 6 (e), the vulcanized thickness of the vulcanized 2b ′ portion is 10% of the rubber sheet thickness t _{3 in} the vulcanized and unvulcanized belt portions. The following thickness is preferable. Furthermore, it is preferable that the vulcanized thickness is 0 at the tip of the unvulcanized zone. Moreover, the length from a junction part is 3-50 mm, Preferably it is 3-20 mm.

The composite vulcanized rubber sheet of the present invention uses the vulcanized rubber sheet 6 and includes an unvulcanized rubber sheet containing a vulcanizing agent between the unvulcanized band portions at the end of the vulcanized rubber sheet 6. Are end-face bonded, and the unvulcanized rubber sheet and the unvulcanized belt portions are simultaneously vulcanized and integrated.
The production of the composite vulcanized rubber sheet of the present invention will be described with reference to FIG. 2 (a) to 2 (c) are diagrams illustrating a manufacturing process of a composite vulcanized rubber sheet. 2, 3, 5, and 7, the hatched portion represents a vulcanized portion.
A vulcanized rubber sheet 6 having an unvulcanized band portion 2c that does not include a vulcanizing agent at an end portion and an unvulcanized rubber sheet 7 that includes a vulcanizing agent are prepared (FIG. 2A).
The unvulcanized rubber sheet 7 may be of a different material and composition as long as it can be vulcanized under the same or similar vulcanization conditions as the unvulcanized band portion 2c. Preferably, it is an unvulcanized rubber sheet having the same material and composition as the unvulcanized rubber sheet 1 containing a vulcanizing agent for producing the vulcanized rubber sheet 6. By using unvulcanized rubber sheets of the same material and composition, a composite vulcanized rubber sheet having uniform characteristics when obtained as a composite vulcanized rubber sheet can be obtained. Moreover, the magnitude | sizes, such as the length of the width | variety of the unvulcanized rubber sheet 7, can be selected arbitrarily.

Next, the unvulcanized rubber sheet 7 containing a vulcanizing agent is end-joined between the unvulcanized belts 2c at the end of the vulcanized rubber sheet 6 (FIG. 2 (b)).
Thereafter, the composite vulcanized rubber sheet 8 can be produced by simultaneous vulcanization by press vulcanization and integration (FIG. 2 (c)).
By simultaneous vulcanization by press vulcanization, the sheet thickness of the integrated joint 8b becomes the same as the thickness of the vulcanized rubber sheet 8a.
As the press vulcanization conditions, the optimum conditions are selected according to the thickness, size, and the like of the vulcanized rubber sheet 6 and the unvulcanized rubber sheet 7.

  Other shapes of the end faces of the unvulcanized rubber sheet 7 and the vulcanized rubber sheet 6 are shown in FIG. The cross-sectional shape of the unvulcanized rubber sheet 7 can be an inverted trapezoid having a hypotenuse 7a as shown in FIG. Or it can be an inverted triangle. In these cases, the 2c ′ surface of the vulcanized rubber sheet 6 serving as the joining surface has a similar cross-sectional shape that can form a single sheet when the vulcanized rubber sheet 6 and the unvulcanized rubber sheet 7 are end-face joined. It is.

  2 and 3, an example in which one end surfaces of the vulcanized rubber sheet 6 are joined to each other has been described. For example, an unvulcanized band 2c portion is formed also on the other side of the rectangular shape of the vulcanized rubber sheet 6. And the composite vulcanized rubber sheet which has the magnitude | size which expanded the length and the width direction by joining the end surfaces can be manufactured.

Another form of the composite vulcanized rubber sheet is shown in FIG. 4A is a perspective view of the sleeve, and FIG. 4B is a perspective view of the endless belt.
An unvulcanized rubber sheet is provided on both end surfaces of the opposite side of the vulcanized rubber sheet 6, and the opposite sides are joined together via the unvulcanized rubber sheet 7 by the method shown in FIG. )) Can be manufactured.
Further, by using a plurality of vulcanized rubber sheets 6, an unvulcanized rubber sheet is provided on the end face of each opposite side, and the opposite sides of the plurality of vulcanized rubber sheets 6 are connected to each other by the method shown in FIG. The endless belt (FIG. 4 (b)) can be manufactured by joining via the belt.

In addition to the method of interposing the unvulcanized rubber sheet 7 containing the vulcanizing agent shown in FIG. 2, the vulcanizing agent solution shown in FIG. There is a method of using. FIGS. 5A to 5C are views showing a production process of a composite vulcanized rubber sheet using a vulcanizing agent solution.
A vulcanized rubber sheet 6 having an unvulcanized band portion 2c containing no vulcanizing agent at the end is prepared (FIG. 5A).
The end portions of the unvulcanized zone 2c at the end of the vulcanized rubber sheet 6 are joined to each other, and the vulcanizing agent solution 2d is applied to the unvulcanized zone 2c and dried (FIG. 5 (b)). As the vulcanizing agent, the vulcanizing agent used for the production of the vulcanized rubber sheet 6 can be used.
Thereafter, the composite vulcanized rubber sheet 8 ′ can be manufactured by simultaneous vulcanization by press vulcanization and integration (FIG. 5C).
By simultaneous vulcanization by press vulcanization, the thickness of the integrated joint 8′b becomes the same as the thickness of the vulcanized rubber sheet 8′a.
As the press vulcanization conditions, optimum conditions are selected depending on the thickness, size, etc. of the vulcanized rubber sheet 6.

FIG. 7 is a cross-sectional view in the case where the vulcanized rubber sheets whose one sheet surface is vulcanized are joined to each other at the end of the unvulcanized rubber sheet 6.
The cross section of the end portion of the unvulcanized rubber sheet 6 is cut at an acute angle with respect to the vulcanized surface (FIGS. 7A and 7B) and at the same right angle (FIG. 7C). ) And bias cut (FIG. 7D) at the same obtuse angle.
In the case of the joining shown in FIGS. 7 (a) and 7 (b), the unvulcanized rubber sheet 7 containing a vulcanizing agent is interposed between the unvulcanized belts 2c at the ends, and the unvulcanized belt 2c. A composite vulcanized rubber sheet is obtained by simultaneously vulcanizing the portion and the unvulcanized rubber sheet 7 by press vulcanization.
In the case of the joining shown in FIG. 7 (c), the end portions of the unvulcanized zone 2c are joined to each other, the vulcanizing agent solution 2d is applied to the unvulcanized zone 2c and dried, and then pressed. A composite vulcanized rubber sheet is obtained by simultaneous vulcanization by vulcanization.
In the case of the joining shown in FIG. 7 (d), the surfaces opposite to the vulcanized end surfaces are overlapped, and the vulcanizing agent solution 2d is applied and dried on the overlapping surface. Then, a composite vulcanized rubber sheet is obtained by simultaneous vulcanization by press vulcanization. In this case, since the unvulcanized portion is plastically deformed, the sheet thickness of the integrated joint can be made equal to the thickness of the vulcanized rubber sheet by press vulcanization.
Further, it is preferable to apply and dry a primer such as a silicone primer on the surfaces to be joined after applying and drying the vulcanizing agent solution. By applying and drying the primer, variations in quality such as adhesive strength can be prevented. An example of the primer is Silicone Primer No24 manufactured by Shin-Etsu Chemical Co., Ltd.

  The composite vulcanized rubber sheet of the present invention can have any thickness as long as the sheet thickness can vulcanize the unvulcanized portion. The thickness is preferably 0.5 mm to 20 mm, more preferably 1 mm to 10 mm, and still more preferably 1 mm to 5 mm. The composite vulcanized rubber sheet of the present invention can be suitably used for uses such as a vacuum press sheet, a laminator sheet, a waterproof sheet, and a herbicidal sheet.

Hereinafter, the present invention will be described in detail by way of examples. In the following description, “parts” indicates parts by weight. Example 1
Shin-Etsu Chemical Co., Ltd. contains 80% by weight of 2,5dimethyl-2,5-bis (t-butylperoxy) -hexane as a vulcanizing component in 100 parts of a silicone rubber compound (trade name: KE961U) manufactured by Shin-Etsu Chemical Co., Ltd. Industrial Co., Ltd. silicone rubber compound vulcanizing agent (trade name: C-8A) 0.5 part is blended, this compound is dispensed with a roll, 3 mm thick × 290 mm wide × 300 mm long The unvulcanized silicone rubber 1 (A sheet) containing a vulcanizing agent was produced.
On the other hand, 100 parts of a silicone rubber compound (trade name: KE961U) manufactured by Shin-Etsu Chemical Co., Ltd. is dispensed with a roll, cut into a strip size of 3 mm thickness × 10 mm width × 300 mm length, and vulcanized. Unvulcanized silicone rubber 2 (B sheet) containing no agent was produced.

The unvulcanized silicone rubbers 1 and 2 are closely arranged in a frame gauge having a thickness of 2.8 mm, a width of 300 mm, and a length of 300 mm. The unvulcanized silicone rubber 2 is covered with a separator film (cellophane) so that it can be easily peeled off from the heated platen after vulcanization because a portion that is not vulcanized even after press vulcanization remains. A 2 mm thick duralumin plate was used as the hot platen.
The molded product charged in the frame gauge was put in a press with a hot platen, and press vulcanized under conditions of a vulcanization temperature of 164 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure.
After taking out from the press machine, the separator film covering the unvulcanized silicone rubber 2 is peeled off, leaving the length of about 3 to 5 mm from the joint, and cutting the unvulcanized silicone rubber 2 to remove the end portion. A vulcanized rubber sheet that can be joined was produced. In addition, when the length from the junction part of the vulcanized part of the unvulcanized silicone rubber sheet 2 was measured by the presence or absence of rubber elasticity, it was about 2 mm.

Example 2
Two vulcanized rubber sheets obtained in Example 1 and the unvulcanized silicone rubber 1 (A sheet) prepared in Example 1 were formed into a strip size of 3 mm thickness × 5 mm width × 300 mm length. Prepare a cut sheet.
Between the two vulcanized rubber sheets, one sheet of the above-mentioned strip-shaped sheet is brought into close contact with the end surface of the strip-shaped sheet and the end surface of the unvulcanized portion of the vulcanized rubber sheet as shown in FIG. Then, the composite vulcanized rubber sheet was manufactured by putting it in a press sandwiched between hot plates and vulcanizing it under the conditions of a vulcanization temperature of 164 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. The appearance, hardness, tensile strength, and elongation of the joint portion of the obtained composite vulcanized rubber sheet were measured. The appearance was measured by visual observation, the hardness was measured by JISK6253-1997 (type A durometer), and the tensile strength and elongation were measured by JISK6251-2004. The results are shown in Table 1. In Table 1, Example 2 control is the characteristics of the vulcanized portion of the vulcanized rubber sheet obtained in Example 1. Example 2 Conventionally joined product is unvulcanized silicone prepared in Example 1 It is obtained by superposing 8 mm ends of rubber 1 and putting them in a press sandwiched between hot plates, and press vulcanizing under a vulcanization temperature of 164 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. It is the test result of the junction part of the obtained composite vulcanized rubber sheet.

Example 3
100 parts of Mitsui Chemicals Co., Ltd. EPDM rubber (trade name: Mitsui EPT3045), 10 parts of a peroxide vulcanizing agent (trade name: Baroxin KED40MB) as a vulcanizing component, and zinc oxide (manufactured by Sakai Chemical Co., Ltd.) Product name: 5 parts of zinc oxide, 1 part of stearic acid manufactured by Kao Co., Ltd., 50 parts of carbon black (trade name: Seast # 116) manufactured by Tokai Carbon Co., Ltd., softened by Nippon San Oil Co., Ltd. The compound (trade name: Sunflex 2280) is blended with 13 parts, and the compound is dispensed with a roll and cut into a size of 3 mm in thickness, 290 mm in width and 300 mm in length. A vulcanized EPDM rubber sheet 1 (A sheet) was produced.
On the other hand, 100 parts of EPDM rubber (trade name: Mitsui EPT3045) manufactured by Mitsui Chemicals Co., Ltd., 5 parts of zinc oxide (trade name: 2 types of zinc oxide) manufactured by Sakai Chemical Co., Ltd., 1 part of stearic acid manufactured by Kao Co., Ltd. And 50 parts carbon black (trade name: Seast # 116) manufactured by Tokai Carbon Co., Ltd. and 13 parts softener (trade name: Sunflex 2280) manufactured by Nippon Sun Oil Co., Ltd. The unvulcanized EPDM rubber sheet 2 (B sheet) containing no vulcanizing agent was produced by dispensing with a roll and cutting into strips having a thickness of 3 mm, a width of 10 mm, and a length of 300 mm.

The unvulcanized EPDM rubber sheets 1 and 2 are closely arranged in a frame gauge having a thickness of 2.8 mm, a width of 300 mm, and a length of 300 mm. Since the unvulcanized EPDM rubber sheet 2 remains uncured even after press vulcanization, it is covered with a separator film (cellophane) so that it can be easily peeled off from the vulcanized hot platen. A 2 mm thick duralumin plate was used as the hot platen.
The molded product charged in the frame gauge was put in a press with a hot platen, and press vulcanized under the conditions of a vulcanization temperature of 164 ° C., a vulcanization time of 20 minutes, and a vulcanization pressure of 1 MPa.
After taking out from the press machine, the separator film covering the unvulcanized EPDM rubber sheet 2 is peeled off, and the unvulcanized EPDM rubber sheet 2 is cut off by leaving about 3 to 5 mm from the joint. A vulcanized rubber sheet capable of joining the parts was produced. In addition, when the length from the junction part of the vulcanized part of the unvulcanized EPDM rubber sheet 2 was measured with or without rubber elasticity, it was about 2 mm.

Example 4
Two vulcanized rubber sheets obtained in Example 3 and a sheet obtained by cutting the unvulcanized EPDM rubber sheet 1 prepared in Example 3 into a strip shape having a thickness of 3 mm, a width of 5 mm, and a length of 300 mm. Prepare one.
Between the two vulcanized rubber sheets, one sheet of the above-mentioned strip-shaped sheet is brought into close contact with the end surface of the strip-shaped sheet and the end surface of the unvulcanized portion of the vulcanized rubber sheet as shown in FIG. Then, the composite vulcanized rubber sheet was manufactured by putting it in a press sandwiched between hot plates and vulcanizing it under the conditions of a vulcanization temperature of 164 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. The appearance, hardness, tensile strength, and elongation of the joint portion of the obtained composite vulcanized rubber sheet were measured in the same manner as in Example 2. The results are shown in Table 1. In Table 1, Example 4 control is the characteristics of the vulcanized portion of the vulcanized rubber sheet obtained in Example 3. Example 4 Conventionally joined product is unvulcanized EPDM prepared in Example 3 By overlapping 8 mm between the ends of the rubber sheet 1 and putting it in a press sandwiched between hot plates, press vulcanization under conditions of a vulcanization temperature of 164 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. It is a test result of the junction part of the obtained composite vulcanized rubber sheet.

Example 5
70 parts of Bayer chlorobutyl rubber (trade name: Chlorobutyl 1240) and 30 parts of Mitsui Chemicals' EPDM rubber (trade name: Mitsui EPT3045) are used as vulcanization components, and Sulfur manufactured by Rhein Chemie (trade name: Renogran S-80). ) 0.6 part, 0.6 parts of Renogran CBS-80 as a vulcanization accelerator, 0.6 part of Renogran CBS-80, 0.6 part of Renogran TMTD-80, and Zinc Oxide Co., Ltd. (Trade name: 2 types of zinc oxide) 3 parts, 1 part of stearic acid manufactured by Kao Corporation, 30 parts of carbon black (trade name: Seast # 116) manufactured by Tokai Carbon Co., Ltd. ) Carbon black (trade name: HTC # SL) 20 parts and Nippon Sun Oil Co., Ltd. softener (trade name: Sunflex 2280) 10 parts are blended. And cut min out to the size of the thickness of 3mm × width 290 mm × length 300mm Le was prepared unvulcanized butyl rubber sheet 1 (A sheet) containing a vulcanizing agent.
On the other hand, 70 parts of chlorobutyl rubber (trade name: chlorobutyl 1240) manufactured by Bayer and 30 parts of EPDM rubber (trade name: Mitsui EPT3045) manufactured by Mitsui Chemicals Co., Ltd. were added to zinc oxide (trade name: zinc oxide) manufactured by Sakai Chemical Co., Ltd. 2 parts) 3 parts, 1 part of stearic acid manufactured by Kao Corporation, 30 parts of carbon black (trade name: Seast # 116) manufactured by Tokai Carbon Co., Ltd., carbon black manufactured by Shin Nikka Carbon Co., Ltd. Name: HTC # SL) 20 parts and Nippon Sun Oil Co., Ltd. softener (trade name: Sunflex 2280) 10 parts, this compound is dispensed with a roll, 3 mm thick × 10 mm wide X Cut into a strip-like size of 300 mm in length to produce an unvulcanized butyl rubber sheet 2 (B sheet) containing no vulcanizing agent.

The unvulcanized butyl rubber sheets 1 and 2 are closely arranged in a frame gauge having a thickness of 2.8 mm, a width of 300 mm, and a length of 300 mm. The unvulcanized butyl rubber sheet 2 is covered with a separator film (cellophane) so as to be easily peeled off from the heated platen after vulcanization because a portion that is not vulcanized even after press vulcanization remains. A 2 mm thick duralumin plate was used as the hot platen.
The molded product charged in the frame gauge was put in a press with a hot platen, and press vulcanized under the conditions of a vulcanization temperature of 164 ° C., a vulcanization time of 20 minutes, and a vulcanization pressure of 1 MPa.
After removing from the press machine, the separator film covering the unvulcanized butyl rubber sheet 2 is peeled off, and the end portion is removed by cutting off the unvulcanized butyl rubber sheet 2 leaving a length of about 3 to 5 mm from the joint. A vulcanized rubber sheet that can be joined was produced. In addition, when the length from the junction part of the vulcanized part of the unvulcanized butyl rubber sheet 2 was measured by the presence or absence of rubber elasticity, it was about 2 mm.

Example 6
Two vulcanized rubber sheets obtained in Example 5 and a sheet 1 obtained by cutting the unvulcanized butyl rubber sheet 1 prepared in Example 5 into a strip shape having a thickness of 3 mm, a width of 5 mm, and a length of 300 mm. Prepare the sheets.
Between the two vulcanized rubber sheets, one sheet of the above-mentioned strip-shaped sheet is brought into close contact with the end surface of the strip-shaped sheet and the end surface of the unvulcanized portion of the vulcanized rubber sheet as shown in FIG. Then, the composite vulcanized rubber sheet was produced by putting it in a press sandwiched between hot plates and vulcanizing it under the conditions of a vulcanization temperature of 151 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. The appearance, hardness, tensile strength, and elongation of the joint portion of the obtained composite vulcanized rubber sheet were measured in the same manner as in Example 2. The results are shown in Table 1. In Table 1, Example 6 control is the characteristics of the vulcanized portion of the vulcanized rubber sheet obtained in Example 5. Example 6 Conventionally joined product is unvulcanized butyl rubber prepared in Example 5 It is obtained by stacking 8 mm between the end portions of the sheet 1 and putting it in a press sandwiched by a hot platen, and press vulcanizing under conditions of a vulcanization temperature of 151 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. It is the test result of the junction part of the obtained composite vulcanized rubber sheet.

Example 7
100 parts of bromobutyl rubber (trade name: bromobutyl X2) manufactured by Bayer Co., Ltd., 2 parts of a peroxide vulcanizing agent (trade name: baroxin KED40MB) as a vulcanizing component, and zinc oxide (trade name: Sakai Chemical Co., Ltd.) 1.5 parts of zinc oxide (2 types), 1 part of stearic acid manufactured by Kao Corporation, 40 parts of carbon black (trade name: Seast # 3) manufactured by Tokai Carbon Co., Ltd., and manufactured by Shin Nikka Carbon Co., Ltd. Carbon black (product name: HTC # SL) 40 parts and Nippon Sun Oil Co., Ltd. softener (product name: Sunflex 2280) 5 parts are blended, and this compound is dispensed with a roll to obtain a thickness. The unvulcanized butyl rubber sheet 1 (A sheet) containing a vulcanizing agent was produced by cutting into a size of 3 mm × width 290 mm × length 300 mm.
On the other hand, 100 parts of Bayer bromobutyl rubber (trade name: bromobutyl X2), 1.5 parts of zinc oxide (trade name: 2 types of zinc oxide) manufactured by Sakai Chemical Co., Ltd., and 1 part of stearic acid manufactured by Kao Corporation And 40 parts of carbon black (trade name: Seast # 3) manufactured by Tokai Carbon Co., Ltd., 40 parts of carbon black (trade name: HTC # SL) manufactured by Nippon Nihon Carbon Co., Ltd., and Sun Sun Oil Co., Ltd. 5 parts of a softener (trade name: Sunflex 2280) is blended, and the compound is dispensed with a roll and cut into a strip size of 3 mm thickness x 10 mm width x 300 mm length. An unvulcanized butyl rubber sheet 2 (B sheet) containing no sulfurizing agent was produced.

The unvulcanized butyl rubber sheets 1 and 2 are closely arranged in a frame gauge having a thickness of 2.8 mm, a width of 300 mm, and a length of 300 mm. The unvulcanized butyl rubber sheet 2 is covered with a separator film (cellophane) so as to be easily peeled off from the heated platen after vulcanization because a portion that is not vulcanized even after press vulcanization remains. A 2 mm thick duralumin plate was used as the hot platen.
The molded product charged in the frame gauge was put in a press with a hot platen, and press vulcanized under the conditions of a vulcanization temperature of 164 ° C., a vulcanization time of 20 minutes, and a vulcanization pressure of 1 MPa.
After removing from the press machine, the separator film covering the unvulcanized butyl rubber sheet 2 is peeled off, and the end portion is removed by cutting off the unvulcanized butyl rubber sheet 2 leaving a length of about 3 to 5 mm from the joint. A vulcanized rubber sheet that can be joined was produced. In addition, when the length from the junction part of the vulcanized part of the unvulcanized butyl rubber sheet 2 was measured by the presence or absence of rubber elasticity, it was about 2 mm.

Example 8
Two vulcanized rubber sheets obtained in Example 7 and a sheet 1 obtained by cutting the unvulcanized butyl rubber sheet 1 prepared in Example 7 into a strip shape having a thickness of 3 mm, a width of 5 mm, and a length of 300 mm. Prepare the sheets.
Between the two vulcanized rubber sheets, one sheet of the above-mentioned strip-shaped sheet is brought into close contact with the end surface of the strip-shaped sheet and the end surface of the unvulcanized portion of the vulcanized rubber sheet as shown in FIG. Then, the composite vulcanized rubber sheet was produced by putting it in a press sandwiched between hot plates and vulcanizing it under the conditions of a vulcanization temperature of 151 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. The appearance, hardness, tensile strength, and elongation of the joint portion of the obtained composite vulcanized rubber sheet were measured in the same manner as in Example 2. The results are shown in Table 1. In Table 1, Example 8 control is the characteristics of the vulcanized portion of the vulcanized rubber sheet obtained in Example 7. Example 8 Conventionally joined product is unvulcanized butyl rubber prepared in Example 7 It is obtained by stacking 8 mm between the end portions of the sheet 1 and putting it in a press sandwiched by a hot platen, and press vulcanizing under conditions of a vulcanization temperature of 151 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. It is the test result of the junction part of the obtained composite vulcanized rubber sheet.

Example 9
100 parts of Bayer's chlorobutyl rubber (trade name: chlorobutyl 1240), 10 parts of a resin vulcanizing agent (trade name: Tacicol # 250) manufactured by Taoka Chemical Co., Ltd. as a vulcanizing component, and oxidation produced by Sakai Chemical Co., Ltd. 5 parts of zinc (trade name: 2 types of zinc oxide), 1 part of stearic acid manufactured by Kao Co., Ltd., and 50 parts of carbon black (trade name: Seast # 116) manufactured by Tokai Carbon Co., Ltd. The compound was dispensed with a roll and cut into a size of 3 mm thick × 290 mm wide × 300 mm long to produce an unvulcanized butyl rubber sheet 1 (A sheet) containing a vulcanizing agent.
On the other hand, 100 parts of Bayer chlorobutyl rubber (trade name: chlorobutyl 1240), 5 parts of Zinc Chemical Co., Ltd. zinc oxide (trade name: 2 types of zinc oxide), 1 part of stearic acid produced by Kao Corporation, 50 parts of carbon black (trade name: Seast # 116) manufactured by Tokai Carbon Co., Ltd. is blended, and the compound is dispensed with a roll to obtain a strip size of 3 mm thick × 10 mm wide × 300 mm long. Cut to produce an unvulcanized butyl rubber sheet 2 (B sheet) containing no vulcanizing agent.

The unvulcanized butyl rubber sheets 1 and 2 are closely arranged in a frame gauge having a thickness of 2.8 mm, a width of 300 mm, and a length of 300 mm. The unvulcanized butyl rubber sheet 2 is covered with a separator film (cellophane) so as to be easily peeled off from the heated platen after vulcanization because a portion that is not vulcanized even after press vulcanization remains. A 2 mm thick duralumin plate was used as the hot platen.
The molded product charged in the frame gauge was put in a press with a hot platen, and press vulcanized under conditions of a vulcanization temperature of 164 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure.
After removing from the press machine, the separator film covering the unvulcanized butyl rubber sheet 2 is peeled off, and the end portion is removed by cutting off the unvulcanized butyl rubber sheet 2 leaving a length of about 3 to 5 mm from the joint. A vulcanized rubber sheet that can be joined was produced. In addition, when the length from the junction part of the vulcanized part of the unvulcanized butyl rubber sheet 2 was measured by the presence or absence of rubber elasticity, it was about 2 mm.

Example 10
Two vulcanized rubber sheets obtained in Example 9 and a sheet 1 obtained by cutting the unvulcanized butyl rubber sheet 1 prepared in Example 9 into a strip size of 3 mm thick, 5 mm wide, and 300 mm long. Prepare the sheets.
Between the two vulcanized rubber sheets, one sheet of the above-mentioned strip-shaped sheet is brought into close contact with the end surface of the strip-shaped sheet and the end surface of the unvulcanized portion of the vulcanized rubber sheet as shown in FIG. Then, the composite vulcanized rubber sheet was produced by putting it in a press sandwiched between hot plates and vulcanizing it under the conditions of a vulcanization temperature of 151 ° C., a vulcanization time of 40 minutes, and a surface pressure of 1 MPa as the vulcanization pressure. The appearance, hardness, tensile strength, and elongation of the joint portion of the obtained composite vulcanized rubber sheet were measured in the same manner as in Example 2. The results are shown in Table 1. In Table 1, Example 10 control is the characteristics of the vulcanized portion of the vulcanized rubber sheet obtained in Example 9, and Example 10 conventional bonded product is unvulcanized butyl rubber prepared in Example 9 It is obtained by stacking 8 mm between the end portions of the sheet 1 and putting it in a press sandwiched by a hot platen, and press vulcanizing under conditions of a vulcanization temperature of 151 ° C., a vulcanization time of 40 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. It is the test result of the junction part of the obtained composite vulcanized rubber sheet.

  The joint products according to the invention of the present application all had a flat appearance at the joint, and the rubber properties expressed by hardness, tensile strength, and elongation were superior to conventional joint products.

Example 11
Shin-Etsu Chemical Co., Ltd. contains 80% by weight of 2,5dimethyl-2,5-bis (t-butylperoxy) -hexane as a vulcanizing component in 100 parts of a silicone rubber compound (trade name: KE961U) manufactured by Shin-Etsu Chemical Co., Ltd. Industrial Co., Ltd. silicone rubber compound vulcanizing agent (trade name: C-8A) 0.5 parts is blended, this compound is dispensed with a roll, 2 mm thick × 280 mm wide × 300 mm long The unvulcanized silicone rubber 1 (A sheet) containing a vulcanizing agent was produced.
On the other hand, 100 parts of a silicone rubber compound (trade name: KE961U) manufactured by Shin-Etsu Chemical Co., Ltd. is dispensed with a roll, cut into a strip-like size of 2 mm thickness x 10 mm width x 300 mm length, and vulcanized. Unvulcanized silicone rubber 2 (B sheet) containing no agent was produced.

Unvulcanized silicone rubber 2 (B sheet), unvulcanized silicone rubber 1 (A sheet) containing a vulcanizing agent in a frame gauge of thickness 2.8 mm × width 300 mm × length 300 mm, and unvulcanized silicone Closely arrange rubber 2 (B sheet) in this order. The unvulcanized silicone rubber 2 at both ends remains covered with a separator film (cellophane) so that it can be easily peeled off from the heated platen after vulcanization because a portion that does not vulcanize remains even after press vulcanization. A 2 mm thick duralumin plate was used as the hot platen.
The molded product charged in the frame gauge was put in a press with a hot platen, and press vulcanized under conditions of a vulcanization temperature of 164 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure.
After removing from the press machine, the separator film covering the unvulcanized silicone rubber 2 disposed at both ends is peeled off, and the unvulcanized silicone rubber 2 is cut off leaving a length of about 3 to 5 mm from the joint. Thus, a vulcanized rubber sheet capable of joining both ends was manufactured. In addition, when the length from the junction part of the vulcanized part of the unvulcanized silicone rubber sheet 2 was measured by the presence or absence of rubber elasticity, it was about 2 mm.

Example 12
One vulcanized rubber sheet containing unvulcanized parts at both ends obtained in Example 11 and the unvulcanized silicone rubber 1 (A sheet) prepared in Example 11 were 2 mm thick × 5 mm wide × length. One sheet cut into a 300 mm strip size is prepared.
A vulcanized rubber sheet including unvulcanized portions at both ends is rolled into a ring shape so that the unvulcanized portions are joined to each other, and the unvulcanized silicone rubber 1 (A sheet) is adhered between the unvulcanized portions. . Put a cushion rubber sheet in the center of the ring with the close-up part on top, put it in a press with a hot platen, press at a vulcanization temperature of 164 ° C, a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as the surface pressure. The sleeve shown in FIG. 4A was manufactured by vulcanization.
The appearance, hardness, tensile strength, and elongation of the joint portion of the obtained sleeve were measured. The appearance was measured by visual observation, the hardness was measured by JISK6253-1997 (type A durometer), and the tensile strength and elongation were measured by JISK6251-2004. The results are shown in Table 2. In Table 2, Example 12 control is the characteristics of the vulcanized portion of the vulcanized rubber sheet obtained in Example 11, and Example 12 conventional joined product is unvulcanized silicone prepared in Example 11 The rubber 1 ends are overlapped with each other 8 mm, and are put into a press sandwiched between hot plates in the same manner as in Example 11. The press is performed under conditions of a vulcanization temperature of 164 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. It is the test result of the junction part of the sleeve obtained by vulcanizing | curing.
This sleeve can be used as a molding air bag.

Example 13
Denka Co., Ltd. chloroprene rubber (trade name: Chloroprene M-120) 60 parts and JSR Co., Ltd. oil-extended SBR rubber (trade name: JSR1723) 55 parts. Renogran S-80) 0.8 parts, Rhein Chemie brand name as a vulcanization accelerator: 0.2 parts Renogran ETU-80, 1 part Renogran TS-80E, Asahi Carbon Co., Ltd. 50 parts of carbon black (trade name: Asahi # 55), 15 parts of clay (trade name: AX kaolin clay) manufactured by Tsuchiya Kaolin Co., Ltd., 2 parts of stearic acid manufactured by Kao Co., Ltd., and Taniguchi Oil Co., Ltd. 6 parts of naphthenic plasticizer (trade name: NCL-22), 3 parts of zinc oxide (trade name: 2 types of zinc oxide) manufactured by Sakai Chemical Co., Ltd., and magnesium oxide (trade name: Nippon Sun Oil Co., Ltd.) # 150) 3 parts This compound is dispensed with a roll and cut into a size of 1.5 mm thick × 280 mm wide × 300 mm long, and an unvulcanized chloroprene rubber sheet 1 containing a vulcanizing agent (A sheet) Two sheets were manufactured.
On the other hand, 60 parts of chloroprene rubber (trade name: chloroprene M-120) manufactured by Denka Co., Ltd. and 55 parts of oil-extended SBR rubber (trade name: JSR1723) manufactured by JSR Co., Ltd. Name: 50 parts of Asahi # 55, 15 parts of clay (trade name: AX Kaolin clay) manufactured by Tsuchiya Kaolin Co., Ltd., 2 parts of stearic acid manufactured by Kao Co., Ltd., and naphthenic plasticizer manufactured by Taniguchi Oil Co., Ltd. (Product name: NCL-22) 6 parts, Sakai Chemical Co., Ltd. zinc oxide (product name: 2 types of zinc oxide) 3 parts, Nippon Sun Oil Co., Ltd. magnesium oxide (product name: # 150) 3 The compound is dispensed with a roll and cut into a size of 1.5 mm thick × 20 mm wide × 300 mm long, and an unvulcanized chloroprene rubber sheet 2 containing no vulcanizing agent ( B sheets) were manufactured . Moreover, it cut | judged to the magnitude | size of thickness 0.5mm x width (15 mm-17 mm) x length 300mm, and manufactured three unvulcanized chloroprene rubber sheets 2 (B sheet) which do not contain a vulcanizing agent.

The unvulcanized chloroprene rubber sheets 1 and 2 are placed in a frame gauge having a thickness of 2.8 mm, a width of 300 mm and a length of 300 mm, and the unvulcanized chloroprene rubber sheet 1 having a thickness of 1.5 mm and a thickness of 1.5 mm. A rubber sheet 2, a Tetoron woven fabric, an unvulcanized chloroprene rubber sheet 1 having a thickness of 1.5 mm, and a rubber sheet 2 having a thickness of 1.5 mm are arranged in close contact with each other. The unvulcanized chloroprene rubber sheet 2 is covered with a separator film (cellophane) so that it can be easily peeled off from the heated platen after vulcanization because there remains a portion that is not vulcanized even when press vulcanized. A 2 mm thick duralumin plate was used as the hot platen.
The molded product charged in the frame gauge was put in a press with a hot platen, and press vulcanized under the conditions of a vulcanization temperature of 151 ° C., a vulcanization time of 40 minutes, and a vulcanization pressure of 1 MPa as a surface pressure.
After taking out from the press machine, the separator film covering the unvulcanized chloroprene rubber sheet 2 is peeled off, leaving a length of about 3 to 5 mm from the joint, leaving the Tetoron woven fabric, and the unvulcanized chloroprene rubber sheet 2 As a result, a vulcanized rubber sheet with cloth that can join the end portions was produced. In addition, when the length from the junction part of the vulcanized part of the unvulcanized chloroprene rubber sheet 2 was measured with or without rubber elasticity, it was about 2 mm.

Example 14
Two cloth-containing vulcanized rubber sheets obtained in Example 13 and an unvulcanized EPDM rubber sheet 1 prepared in Example 13 are strips of thickness 0.5 mm × width (15 mm to 17 mm) × length 300 mm. Prepare three sheets cut into a shape.
Between the ends of two vulcanized rubber sheets, the strip-shaped sheet is formed into a strip-shaped sheet, one vulcanized rubber sheet Tetoron woven fabric, a strip-shaped sheet, the other vulcanized rubber sheet Tetoron woven fabric, Further, the strip-shaped sheet is sandwiched up and down in order, and the end surface of the strip-shaped sheet and the end surface of the unvulcanized portion of the vulcanized rubber sheet are brought into close contact with each other and placed in a press with a vulcanization temperature of 151 ° C. A vulcanized rubber sheet was manufactured by press vulcanization under the conditions of a vulcanization time of 40 minutes and a vulcanization pressure of a surface pressure of 1 MPa.
The appearance, hardness, and elongation of the bonded portion of the obtained composite vulcanized rubber sheet were measured in the same manner as in Example 12. The tensile strength was measured according to JIS L1096 (General Textile Testing Method), and the unit was expressed in N / 3 cm. The results are shown in Table 2. In Table 2, Example 14 control is the characteristics of the vulcanized portion of the cloth-containing vulcanized rubber sheet obtained in Example 13, and Example 14 conventional joined product is the unadded product prepared in Example 13. The ends of the vulcanized chloroprene rubber sheet 1 are overlapped with each other 8 mm, put into a press with a hot platen, and vulcanized under conditions of a vulcanization temperature of 151 ° C., a vulcanization time of 40 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. It is the test result of the junction part of the composite vulcanized rubber sheet obtained by this.
This composite vulcanized rubber sheet containing Tetoron fabric can be used as a waterproof sheet for dams.

Example 15
Denka Co., Ltd. chloroprene rubber (trade name: Chloroprene M-120) 60 parts and JSR Co., Ltd. oil-extended SBR rubber (trade name: JSR1723) 55 parts. Renogran S-80) 0.8 parts, Rhein Chemie brand name as a vulcanization accelerator: 0.2 parts Renogran ETU-80, 1 part Renogran TS-80E, Asahi Carbon Co., Ltd. 50 parts of carbon black (trade name: Asahi # 55), 15 parts of clay (trade name: AX kaolin clay) manufactured by Tsuchiya Kaolin Co., Ltd., 2 parts of stearic acid manufactured by Kao Co., Ltd., and Taniguchi Oil Co., Ltd. 6 parts of naphthenic plasticizer (trade name: NCL-22), 3 parts of zinc oxide (trade name: 2 types of zinc oxide) manufactured by Sakai Chemical Co., Ltd., and magnesium oxide (trade name: Nippon Sun Oil Co., Ltd.) # 150) 3 parts This compound is dispensed with a roll and cut into a size of 10 mm thick × 280 mm wide × 300 mm long to produce an unvulcanized chloroprene rubber sheet 1 (A sheet) containing a vulcanizing agent. did.
On the other hand, 60 parts of chloroprene rubber (trade name: chloroprene M-120) manufactured by Denka Co., Ltd. and 55 parts of oil-extended SBR rubber (trade name: JSR1723) manufactured by JSR Co., Ltd. Name: 50 parts of Asahi # 55, 15 parts of clay (trade name: AX Kaolin clay) manufactured by Tsuchiya Kaolin Co., Ltd., 2 parts of stearic acid manufactured by Kao Co., Ltd., and naphthenic plasticizer manufactured by Taniguchi Oil Co., Ltd. (Product name: NCL-22) 6 parts, Sakai Chemical Co., Ltd. zinc oxide (product name: 2 types of zinc oxide) 3 parts, Nippon Sun Oil Co., Ltd. magnesium oxide (product name: # 150) 3 The compound is dispensed with a roll and cut into a size of 10 mm thickness x 20 mm width x 300 mm length, and an unvulcanized chloroprene rubber sheet 2 (B sheet containing no vulcanizing agent) ) Was manufactured.

The unvulcanized chloroprene rubber sheets 1 and 2 are closely arranged in a frame gauge having a thickness of 9.8 mm, a width of 300 mm, and a length of 300 mm. The unvulcanized chloroprene rubber sheet 2 is covered with a separator film (cellophane) so that it can be easily peeled off from the heated platen after vulcanization because there remains a portion that is not vulcanized even when press vulcanized. A 2 mm thick duralumin plate was used as the hot platen.
The molded product charged in the frame gauge was put in a press with a hot platen, and press vulcanized under conditions of a vulcanization temperature of 151 ° C., a vulcanization time of 60 minutes, and a vulcanization pressure of 1 MPa as a surface pressure.
After removing from the press machine, the separator film covering the unvulcanized chloroprene rubber sheet 2 is peeled off, and the unvulcanized chloroprene rubber sheet 2 is removed leaving a length of about 3 to 5 mm from the joined portion. A vulcanized rubber sheet that can be bonded to each other was produced. In addition, when the length from the junction part of the vulcanized part of the unvulcanized chloroprene rubber sheet 2 was measured with or without rubber elasticity, it was about 2 mm.

Example 16
Two vulcanized rubber sheets containing unvulcanized portions at both ends obtained in Example 15 and unvulcanized silicone rubber 1 (A sheet) prepared in Example 15 were 10 mm thick × 15 mm to 17 mm wide (15 mm to 17 mm). ) X One sheet cut into a strip shape having a length of 300 mm is prepared.
The end face of the strip-shaped sheet and the end face of the unvulcanized part of the vulcanized rubber sheet are in close contact with each other between two vulcanized rubber sheets, put in a press with a hot platen, and vulcanized at a temperature of 151 ° C. A composite vulcanized rubber sheet was produced by press vulcanization under a condition of a vulcanization pressure of 60 MPa and a vulcanization pressure of 1 MPa as a surface pressure.
The appearance, hardness, tensile strength, and elongation of the joint portion of the obtained composite vulcanized rubber sheet were measured in the same manner as in Example 12. The results are shown in Table 2. In Table 2, Example 16 control is the characteristics of the vulcanized portion of the vulcanized rubber sheet obtained in Example 15, and Example 16 conventional joined product is unvulcanized chloroprene prepared in Example 15. By overlapping the end portions of the rubber sheet 1 with each other 8 mm, putting them in a press sandwiched between hot plates, press vulcanizing under conditions of a vulcanization temperature of 151 ° C., a vulcanization time of 60 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. It is a test result of the junction part of the obtained composite vulcanized rubber sheet.
This thick composite vulcanized rubber sheet can be used as a dam waterproof sheet.

Example 17
A strip of 2 vulcanized rubber sheets containing unvulcanized parts obtained in Example 1 and unvulcanized silicone rubber 1 (A sheet) containing a vulcanizing agent 3 mm thick × 5 mm wide × 300 mm long. A sheet cut into a size is prepared. The blending ratio of the unvulcanized silicone rubber containing this vulcanizing agent is as follows: 100 parts of silicone rubber compound (trade name: KE961U) manufactured by Shin-Etsu Chemical Co., Ltd. and 2,5 dimethyl-2,5 bis as a vulcanized component It is 1.0 part of a vulcanizing agent (trade name: C-8A) manufactured by Shin-Etsu Chemical Co., Ltd., containing 80% by weight of (t-butylperoxy) -hexane.
Between the two vulcanized rubber sheets, one sheet of the above-mentioned strip-shaped sheet is brought into close contact with the end surface of the strip-shaped sheet and the end surface of the unvulcanized portion of the vulcanized rubber sheet as shown in FIG. Then, the composite vulcanized rubber sheet was manufactured by putting it in a press sandwiched between hot plates and vulcanizing it under the conditions of a vulcanization temperature of 164 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. The appearance, hardness, tensile strength, and elongation of the joint portion of the obtained composite vulcanized rubber sheet were measured in the same manner as in Example 2. The results are shown in Table 2. In Table 2, Example 17 control is the characteristics of the vulcanized portion of the vulcanized rubber sheet obtained in Example 1, and Example 17 conventional bonded product is unvulcanized silicone prepared in Example 1. It is obtained by superposing 8 mm ends of rubber 1 and putting them in a press sandwiched between hot plates, and press vulcanizing under a vulcanization temperature of 164 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. It is the test result of the junction part of the obtained composite vulcanized rubber sheet.
The unvulcanized rubber sheet containing a vulcanizing agent used for joining has stable physical properties when the amount of the vulcanizing agent is larger than usual.

Example 18
A strip of 2 vulcanized rubber sheets containing unvulcanized parts obtained in Example 1 and unvulcanized silicone rubber 1 (A sheet) containing a vulcanizing agent 3 mm thick × 5 mm wide × 300 mm long. A sheet cut into a size is prepared. The blending ratio of the unvulcanized silicone rubber containing this vulcanizing agent is 20 parts by weight of dicumyl peroxide as a vulcanized component in 100 parts of a silicone rubber compound (trade name: KE961U) manufactured by Shin-Etsu Chemical Co., Ltd. This is 2.0 parts of a vulcanizing agent (trade name: C-3) for silicone rubber compound manufactured by Shin-Etsu Chemical Co., Ltd.
Between the two vulcanized rubber sheets, one sheet of the above-mentioned strip-shaped sheet is brought into close contact with the end surface of the strip-shaped sheet and the end surface of the unvulcanized portion of the vulcanized rubber sheet as shown in FIG. Then, the composite vulcanized rubber sheet was manufactured by putting it in a press sandwiched between hot plates and vulcanizing it under the conditions of a vulcanization temperature of 164 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. The appearance, hardness, tensile strength, and elongation of the joint portion of the obtained composite vulcanized rubber sheet were measured in the same manner as in Example 2. The results are shown in Table 2. In Table 2, Example 18 control is the characteristics of the vulcanized portion of the vulcanized rubber sheet obtained in Example 1, and Example 18 conventional bonded product is the unvulcanized silicone prepared in Example 1. It is obtained by superposing 8 mm ends of rubber 1 and putting them in a press sandwiched between hot plates, and press vulcanizing under a vulcanization temperature of 164 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. It is the test result of the junction part of the obtained composite vulcanized rubber sheet.

Example 19
Shin-Etsu Chemical Co., Ltd. containing two vulcanized rubber sheets containing an unvulcanized part obtained in Example 1 and 80% by weight of 2,5-dimethyl-2,5-bis (t-butylperoxy) -hexane A vulcanizing agent solution prepared by dissolving 1 g of a vulcanizing agent (trade name: C-8A) for silicone rubber compound manufactured by Co., Ltd. in 50 ml of toluene is prepared.
The end faces of the two vulcanized rubber sheets are brought into close contact with each other as shown in FIG. 5B, and the vulcanizing agent solution is applied to the unvulcanized portions of the two sheets with a brush. After drying, they are brought into close contact with each other, put into a press with a hot platen, and preliminarily vulcanized under the conditions of a vulcanization temperature of 100 ° C., a vulcanization time of 3 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. Furthermore, a composite vulcanized rubber sheet was produced by main vulcanization under the conditions of a vulcanization temperature of 164 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. The appearance, hardness, tensile strength, and elongation of the joint portion of the obtained composite vulcanized rubber sheet were measured in the same manner as in Example 1. The results are shown in Table 2. In Table 2, Example 19 control is the characteristics of the vulcanized portion of the vulcanized rubber sheet obtained in Example 1. Example 19 Conventionally joined product is unvulcanized silicone prepared in Example 1 It is obtained by superposing 8 mm ends of rubber 1 and putting them in a press sandwiched between hot plates, and press vulcanizing under a vulcanization temperature of 164 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. It is the test result of the junction part of the obtained composite vulcanized rubber sheet.

Example 20
50 parts of Bayer's chlorobutyl rubber (trade name: chlorobutyl 1240) and 50 parts of Mitsui Chemicals' EPDM rubber (trade name: Mitsui EPT3045) are used as sulfur components (trade name: Renogran S-80) as a vulcanization component. ) 0.6 part, 0.6 parts of Renogran CBS-80 as a vulcanization accelerator, 0.6 part of Renogran CBS-80, 0.6 part of Renogran TMTD-80, and Zinc Oxide Co., Ltd. (Trade name: 2 types of zinc oxide) 3 parts, 1 part of stearic acid manufactured by Kao Corporation, 30 parts of carbon black (trade name: Seast # 116) manufactured by Tokai Carbon Co., Ltd. ) Carbon black (trade name: HTC # SL) 20 parts and Nippon Sun Oil Co., Ltd. softener (trade name: Sunflex 2280) 10 parts are blended. And cut min out to the size of the thickness of 3mm × width 290 mm × length 300mm Le was prepared unvulcanized butyl rubber sheet 1 (A sheet) containing a vulcanizing agent.
On the other hand, 50 parts of bromobutyl rubber (trade name: bromobutyl X2) manufactured by Bayer and 50 parts of EPDM rubber (trade name: Mitsui EPT3045) manufactured by Mitsui Chemicals, 1 part of stearic acid manufactured by Kao Corporation, and Tokai Carbon ( 30 parts carbon black (trade name: Seast # 116), 20 parts carbon black (trade name: HTC # SL) made by Nisshin Carbon Co., Ltd. Name: Sunflex 2280) is blended with 10 parts, this compound is dispensed with a roll, cut into a strip size of 3 mm thickness x 10 mm width x 300 mm length, and contains no vulcanizing agent Unvulcanized butyl rubber sheet 2 (B sheet) was produced.

The unvulcanized butyl rubber sheets 1 and 2 are closely arranged in a frame gauge having a thickness of 2.8 mm, a width of 300 mm, and a length of 300 mm. The unvulcanized butyl rubber sheet 2 is covered with a separator film (cellophane) so as to be easily peeled off from the heated platen after vulcanization because a portion that is not vulcanized even after press vulcanization remains. A 2 mm thick duralumin plate was used as the hot platen.
The molded product charged in the frame gauge was put in a press with a hot platen, and press vulcanized under the conditions of a vulcanization temperature of 164 ° C., a vulcanization time of 20 minutes, and a vulcanization pressure of 1 MPa.
After removing from the press machine, the separator film covering the unvulcanized butyl rubber sheet 2 is peeled off, and the end portion is removed by cutting off the unvulcanized butyl rubber sheet 2 leaving a length of about 3 to 5 mm from the joint. A vulcanized rubber sheet that can be joined was produced. In addition, when the length from the junction part of the vulcanized part of the unvulcanized butyl rubber sheet 2 was measured by the presence or absence of rubber elasticity, it was about 2 mm.

Example 21
A vulcanizing agent solution prepared by dissolving two vulcanized rubber sheets obtained in Example 20 and 2 g of NOF peroxide (trade name: Perhexa 25B-100) as a vulcanizing agent in 50 ml of toluene is prepared.
The end faces of the two vulcanized rubber sheets are brought into close contact with each other as shown in FIG. 5B, and the vulcanizing agent solution is applied to the unvulcanized portions of the two sheets with a brush. After drying, they are brought into contact with each other, put in a press with a hot platen, vulcanized at a vulcanization temperature of 151 ° C., a vulcanization time of 40 minutes, and a vulcanization pressure of 1 MPa as a surface pressure, thereby producing a composite vulcanized rubber sheet. Manufactured. The appearance, hardness, tensile strength, and elongation of the joint portion of the obtained composite vulcanized rubber sheet were measured in the same manner as in Example 1. The results are shown in Table 2. In Table 2, Example 21 control is the characteristics of the vulcanized portion of the vulcanized rubber sheet obtained in Example 20, and Example 21 conventional bonded product is unvulcanized silicone prepared in Example 20 It is obtained by superposing 8mm ends of rubber 1 and putting them in a press sandwiched between hot plates, and press vulcanizing under conditions of vulcanization temperature of 151 ° C, vulcanization time of 40 minutes, and vulcanization pressure of 1 MPa surface pressure. It is the test result of the junction part of the obtained composite vulcanized rubber sheet.

Example 22
Two vulcanized rubber sheets including the unvulcanized portion obtained in Example 1 and the unvulcanized silicone rubber 1 (A sheet) prepared in Example 1 are 3 mm thick × 10 mm wide × 300 mm long. One sheet cut into a strip size and 80% by weight of 2,5-dimethyl-2,5-bis (t-butylperoxy) -hexane added to a silicone rubber compound manufactured by Shin-Etsu Chemical Co., Ltd. A vulcanizing agent solution in which 1 g of a vulcanizing agent (trade name: C-8A) is dissolved in 50 ml of toluene is prepared.
A vulcanizing agent solution is applied to the unvulcanized portions of the two vulcanized rubber sheets with a brush and dried. After drying, as shown in FIG. 2 (b), one strip-shaped sheet is placed between two vulcanized rubber sheets, and the end surface of the strip-shaped sheet and the end surface of the unvulcanized portion of the vulcanized rubber sheet are shown. The composite vulcanized rubber sheet was manufactured by pressing and vulcanizing under close pressure conditions with a vulcanization temperature of 164 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 1 MPa.
The appearance, hardness, tensile strength, and elongation of the joint portion of the obtained composite vulcanized rubber sheet were measured in the same manner as in Example 1. The results are shown in Table 2. In Table 2, Example 22 control is the characteristics of the vulcanized portion of the vulcanized rubber sheet obtained in Example 1, and Example 22 reference joint product is the joint result of Example 1, Example 22 Conventionally bonded product was prepared by superposing the end portions of the unvulcanized silicone rubber 1 prepared in Example 1 8 mm, and sandwiched between hot plates, put in a press, vulcanization temperature 164 ° C., vulcanization time 30 minutes, It is a test result of the joint part of the composite vulcanized rubber sheet obtained by press vulcanization under the condition of a surface pressure of 1 MPa as the vulcanization pressure.

  The joint products according to the invention of the present application all had a flat appearance at the joint, and the rubber properties expressed by hardness, tensile strength, and elongation were superior to conventional joint products.

Example 23
Shin-Etsu Chemical Co., Ltd. contains 80% by weight of 2,5dimethyl-2,5-bis (t-butylperoxy) -hexane as a vulcanizing component in 100 parts of a silicone rubber compound (trade name: KE961U) manufactured by Shin-Etsu Chemical Co., Ltd. Industrial Co., Ltd. silicone rubber compound vulcanizing agent (trade name: C-8A) 0.5 part is blended, this compound is dispensed with a roll, and the size is 3 mm thick x 1100 mm wide x 4200 mm long The unvulcanized silicone rubber 1 (A sheet) containing a vulcanizing agent was produced.
On the other hand, 100 parts of a silicone rubber compound (trade name: KE961U) manufactured by Shin-Etsu Chemical Co., Ltd. is dispensed with a roll, cut into a strip size of 3 mm thickness x 60 mm width x 4200 mm length, and vulcanized. Unvulcanized silicone rubber 2 (B sheet) containing no agent was produced.

The unvulcanized silicone rubbers 1 and 2 are closely placed in the gauge. Thereafter, the vulcanizing agent solution (C-8A / toluene = 10 g / 200 g) is applied to one surface of the B sheet and dried. The surface opposite to the surface on which the vulcanizing agent solution is applied is covered with a mat pet (polyester film having a thickness of 25 μm × 160 mm) and masked. A 2 mm thick duralumin plate was used as the hot platen.
The molded product charged in the gauge was put in a press with a hot platen, and press vulcanized under the conditions of a vulcanization temperature of 164 ° C., a vulcanization time of 30 minutes, and a vulcanization pressure of 8 MPa as a surface pressure.
After removing from the press machine, the mat pet film covering the unvulcanized silicone rubber 2 is peeled off, and the unvulcanized silicone rubber 2 is cut off with a bias cutter, leaving a length of about 3 to 20 mm from the joint. Thus, a vulcanized rubber sheet was produced in which one surface was vulcanized and the end portions could be joined.

Example 24
Two of the vulcanized rubber sheets obtained in Example 1 and the unvulcanized silicone rubber 1 (A sheet) prepared in Example 1 were cut into strips having an inverted triangle cross section and a length of 4200 mm. Prepare one sheet.
A vulcanizing agent solution (C-8A / toluene = 10 g / 200 g) is applied and dried on the surface of the two vulcanized rubber sheets, which are the unvulcanized portion, and the entire side surface subjected to bias cutting.
FIG. 7A shows one strip-shaped sheet between two vulcanized rubber sheets, two sides of the strip-shaped sheet having an inverted triangular cross section, and a bias cut surface of an unvulcanized portion of the vulcanized rubber sheet. ), And put into a press sandwiched between hot plates, vulcanized at a vulcanization temperature of 164 ° C., a vulcanization time of 60 minutes, and a vulcanization pressure of 4 to 5 MPa as surface pressure, and further 180 ° C. A composite vulcanized rubber sheet was manufactured by annealing for 3 hours. The size of the composite vulcanized rubber sheet was 3 mm thick × 2700 mm wide × 3900 mm long.
As a result of measuring the appearance, hardness, tensile strength, and elongation of the joint portion of the obtained composite vulcanized rubber sheet by the same method as in Example 1, the appearance of the joint portion was flat, the hardness was 59, and the tensile strength was The strength was 5.5 MPa and the elongation was 230%.

Example 25
50 parts of Bayer's chlorobutyl rubber (trade name: chlorobutyl 1240) and 50 parts of Mitsui Chemicals' EPDM rubber (trade name: Mitsui EPT3045) are used as sulfur components (trade name: Renogran S-80) as a vulcanization component. ) 0.6 part, 0.6 parts of Renogran CBS-80 as a vulcanization accelerator, 0.6 part of Renogran CBS-80, 0.6 part of Renogran TMTD-80, and Zinc Oxide Co., Ltd. (Trade name: 2 types of zinc oxide) 3 parts, 1 part of stearic acid manufactured by Kao Corporation, 30 parts of carbon black (trade name: Seast # 116) manufactured by Tokai Carbon Co., Ltd. ) Carbon black (trade name: HTC # SL) 20 parts and Nippon Sun Oil Co., Ltd. softener (trade name: Sunflex 2280) 10 parts are blended. And cut min out to the size of the thickness of 3mm × width 290 mm × length 300mm Le was prepared unvulcanized butyl rubber sheet 1 (A sheet) containing a vulcanizing agent.
On the other hand, 50 parts of bromobutyl rubber (trade name: bromobutyl X2) manufactured by Bayer and 50 parts of EPDM rubber (trade name: Mitsui EPT3045) manufactured by Mitsui Chemicals, 1 part of stearic acid manufactured by Kao Corporation, and Tokai Carbon ( 30 parts carbon black (trade name: Seast # 116), 20 parts carbon black (trade name: HTC # SL) made by Nisshin Carbon Co., Ltd. Name: Sunflex 2280) is blended with 10 parts, this compound is dispensed with a roll, cut into a strip size of 3 mm thickness x 10 mm width x 300 mm length, and contains no vulcanizing agent Unvulcanized butyl rubber sheet 2 (B sheet) was produced.

The unvulcanized butyl rubber sheets 1 and 2 are closely arranged in a frame gauge having a thickness of 2.8 mm, a width of 300 mm, and a length of 300 mm. Thereafter, a vulcanizing agent solution (a peroxide cross-linking agent manufactured by NOF Corporation (trade name: Perhexa 25B-100) / toluene = 2 g / 500 ml) is applied to one surface of the B sheet and dried. The surface opposite to the surface on which the vulcanizing agent solution is applied is covered with a mat pet (polyester film having a thickness of 25 μm × 160 mm) and masked. A 2 mm thick duralumin plate was used as the hot platen.
The molded product charged in the frame gauge was put in a press with a hot platen, and press vulcanized under the conditions of a vulcanization temperature of 164 ° C., a vulcanization time of 20 minutes, and a vulcanization pressure of 1 MPa.
After taking out from the press machine, the mat pet film covering the unvulcanized butyl rubber sheet 2 is peeled off, leaving a length of about 3 to 5 mm from the joining portion, and the unvulcanized butyl rubber sheet 2 is slanted using a bias cutter. The vulcanized rubber sheet which can join an edge part was manufactured by cutting out into 2 parts. In addition, when the length from the junction part of the vulcanized part of the unvulcanized butyl rubber sheet 2 was measured with or without rubber elasticity, it was 3 to 5 mm.

Example 26
Two vulcanized rubber sheets obtained in Example 25 and one sheet obtained by cutting an unvulcanized butyl rubber sheet for joining into a strip size of 3 mm thickness x 10 mm width x 300 mm length are prepared. .
In addition, the unvulcanized butyl rubber sheet for joining was manufactured by Kao Corporation on 50 parts of bromobutyl rubber (trade name: bromobutyl X2) manufactured by Bayer and 70 parts of EPDM rubber (trade name: Mitsui EPT3045) manufactured by Mitsui Chemicals, Inc. 1 part of stearic acid, 30 parts of carbon black (trade name: Seest # 116) manufactured by Tokai Carbon Co., Ltd., 20 parts of carbon black (trade name: HTC # SL) manufactured by Nippon Nikkei Carbon Co., Ltd. A blend of 10 parts of a softener (trade name: Sunflex 2280) manufactured by Petroleum Co., Ltd. and 5 parts of a peroxide cross-linking agent (trade name: Perhexa 25B-100) manufactured by NOF Corporation, roll the compound. And was cut into strips of 3 mm thickness x 10 mm width x 300 mm length.
One strip-like sheet is placed between two vulcanized rubber sheets as shown in FIG. 7B, and a vulcanizing agent solution (Nippon Oil Co., Ltd.) is placed on the unvulcanized portion of the joint. A peroxide cross-linking agent (trade name: Perhexa 25B-100) / toluene = 2 g / 500 ml) was applied and dried. Thereafter, the composite vulcanized rubber sheet was produced by putting into a press with a hot platen and press vulcanizing under conditions of a vulcanization temperature of 151 ° C., a vulcanization time of 40 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. The appearance, hardness, tensile strength, and elongation of the joint portion of the obtained composite vulcanized rubber sheet were measured in the same manner as in Example 2. The results are shown in Table 3. In Table 3, Example 26 control is the characteristics of the vulcanized portion of the vulcanized rubber sheet obtained in Example 25. Example 26 Conventionally joined product is unvulcanized butyl rubber prepared in Example 25. It is obtained by stacking 8 mm between the end portions of the sheet 1 and putting it in a press sandwiched by a hot platen, and press vulcanizing under conditions of a vulcanization temperature of 151 ° C., a vulcanization time of 40 minutes, and a vulcanization pressure of 1 MPa as a surface pressure. It is the test result of the junction part of the obtained composite vulcanized rubber sheet.

  The joint products according to the invention of the present application all had a flat appearance at the joint, and the rubber properties expressed by hardness, tensile strength, and elongation were superior to conventional joint products.

Since the vulcanized rubber sheet of the present invention has a simple joining method and can be joined in the length and width directions, a composite rubber sheet of any size can be obtained.
Therefore, in the future, it can be used in fields such as a sheet for vacuum press, a sheet for laminator, a waterproof sheet, and a weedproof sheet.

DESCRIPTION OF SYMBOLS 1 Unvulcanized rubber sheet containing vulcanizing agent 2 Unvulcanized rubber sheet not containing vulcanizing agent 3 Joint 4 Heating plate 5 Release film 6 Vulcanized rubber sheet 7 Unvulcanized rubber containing vulcanizing agent Sheet 8 Composite vulcanized rubber sheet 9 Joint

Claims (15)

  A vulcanized rubber sheet capable of joining ends, wherein the end includes an unvulcanized band portion that does not include a vulcanizing agent, and the unvulcanized band portion includes an unvulcanized rubber sheet that includes a vulcanizing agent; It is a band part having a length of a width that becomes a vulcanized rubber by vulcanization by joining the end face or joining the unvulcanized band part in the presence of a vulcanizing agent. Vulcanized rubber sheet.   The vulcanized rubber sheet according to claim 1, wherein one end surface of the end portion is vulcanized. A composite vulcanized rubber sheet having end faces joined at least one end of a plurality of vulcanized rubber sheets,
The vulcanized rubber sheet is a vulcanized rubber sheet according to claim 1 or 2, and an unvulcanized rubber containing a vulcanizing agent between unvulcanized belt portions at the end of the vulcanized rubber sheet. A composite vulcanized rubber sheet obtained by joining the unfinished rubber sheet and the unvulcanized belt part at the same time by joining the end faces of the sheet and integrating them together. A composite vulcanized rubber sheet in which one end of a vulcanized rubber sheet is joined end-to-end to form a sleeve or endless belt,
The vulcanized rubber sheet is a vulcanized rubber sheet according to claim 1 or 2, and an unvulcanized rubber containing a vulcanizing agent between unvulcanized belt portions at the end of the vulcanized rubber sheet. A composite vulcanized rubber sheet obtained by joining the unfinished rubber sheet and the unvulcanized belt part at the same time by joining the end faces of the sheet and integrating them together. A composite vulcanized rubber sheet having end faces joined at least one end of a plurality of vulcanized rubber sheets,
The vulcanized rubber sheet is a vulcanized rubber sheet according to claim 1 or 2, wherein the unvulcanized belt portions at the end portions of the vulcanized rubber sheet are end-face joined to each other, A composite vulcanized rubber sheet obtained by applying and drying a vulcanizing agent solution to a vulcanized zone portion and simultaneously vulcanizing the unvulcanized zone portions together. A composite vulcanized rubber sheet in which one end of a vulcanized rubber sheet is joined end-to-end to form a sleeve or endless belt,
The vulcanized rubber sheet is a vulcanized rubber sheet according to claim 1 or 2, wherein the unvulcanized belt portions at the end portions of the vulcanized rubber sheet are end-face joined to each other, A composite vulcanized rubber sheet obtained by applying and drying a vulcanizing agent solution to a vulcanized zone portion and simultaneously vulcanizing the unvulcanized zone portions together. A composite vulcanized rubber sheet formed by joining at least one end of a plurality of vulcanized rubber sheets,
The vulcanized rubber sheet is the vulcanized rubber sheet according to claim 1 or 2, wherein unvulcanized belt portions at the end of the vulcanized rubber sheet are joined to each other, and the unvulcanized belt of the joint is obtained. A composite vulcanized rubber sheet obtained by simultaneously vulcanizing and integrating the unvulcanized band portions after applying and drying a vulcanizing agent solution on the portions. A composite vulcanized rubber sheet in which one end of a vulcanized rubber sheet is joined to form a sleeve or endless belt,
The vulcanized rubber sheet is the vulcanized rubber sheet according to claim 1 or 2, wherein unvulcanized belt portions at the end of the vulcanized rubber sheet are joined to each other, and the unvulcanized belt of the joint is obtained. A composite vulcanized rubber sheet obtained by simultaneously vulcanizing and integrating the unvulcanized band portions after applying and drying a vulcanizing agent solution on the portions.   The composite vulcanization according to any one of claims 3 to 8, wherein the joint vulcanized and integrated joint has the same sheet thickness as that of the vulcanized rubber sheet. Rubber sheet.   The composite vulcanized rubber sheet according to claim 9, wherein the composite vulcanized rubber sheet is a cloth-filled rubber sheet. A method for producing a vulcanized rubber sheet according to claim 1 or 2,
End bonding the unvulcanized rubber sheet not containing the vulcanizing agent to the end of the unvulcanized rubber sheet containing the vulcanizing agent;
Covering at least one surface of the unvulcanized rubber sheet not containing the vulcanizing agent with a release film;
A method for producing a vulcanized rubber sheet, comprising simultaneously press-vulcanizing an unvulcanized rubber sheet containing the vulcanizing agent and an unvulcanized rubber sheet not containing the vulcanizing agent.   The step of covering at least one surface of the unvulcanized rubber sheet not containing the vulcanizing agent with a release film covers one surface of the unvulcanized rubber sheet with the release film and vulcanizing agent on the other surface. 12. The method for producing a vulcanized rubber sheet according to claim 11, which is a step of applying and drying the solution. A method for producing a composite vulcanized rubber sheet according to claim 3 or claim 4,
Between the unvulcanized belt portions at the end of the vulcanized rubber sheet, a step of joining the unvulcanized rubber sheet containing the vulcanizing agent to the end faces;
A method for producing a composite vulcanized rubber sheet, comprising the step of simultaneously vulcanizing and integrating the unvulcanized rubber sheet and the unvulcanized belt portions. A method for producing a composite vulcanized rubber sheet according to claim 5 or 6,
End face joining the unvulcanized belt portions of the end of the vulcanized rubber sheet; and
A composite vulcanized rubber sheet comprising a step of simultaneously vulcanizing and integrating the unvulcanized band portions after applying and drying a vulcanizing agent solution to the unvulcanized band portions of the end surface joining portion Manufacturing method. A method for producing a composite vulcanized rubber sheet according to claim 7 or claim 8,
A step of overlapping and joining the unvulcanized band portions at the end of the vulcanized rubber sheet;
And a step of applying and curing the vulcanizing agent solution to the unvulcanized zone portion of the overlapping surface portion and pressing and vulcanizing the unvulcanized zone portions together to integrate them. A method for producing a vulcanized rubber sheet.

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