JP2002327361A - Glass fiber-reinforced laminated non-woven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass-reinforced laminated non-woven fabric, solving an inconvenience caused by the projection of the glass fibers from the end part of a base substrate, excellent in one unit property of the base substrate with an impregnating agent such as asphalt, and suitable as the base substrate for a waterproof material having a high initial strength and excellent in processing property. SOLUTION: This laminated non-woven fabric inserted with plural glass fibers, reinforcing yarns other than the plural glass fibers and/or spun dyed yarns between two layers of the non-woven fabrics is characterized by that the plural glass fibers, reinforcing yarns other than the plural glass fibers and/or spun dyed yarns present in parallel each other in the longitudinal direction of the laminated non-woven fabric, and also the reinforcing yarns other than the plural glass fibers and/or spun dyed yarns present at least at the both end parts of the laminated non-woven fabric, and the method for producing the same is also provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonwoven fabric reinforced with glass fiber, which has high elasticity and high strength, and can be used as a base fabric in the fields of industrial materials, building materials and the like. It is a non-woven fabric which prevents glass fibers from flying out particularly at the cut end face of the base cloth and can be suitably used as a base cloth such as a waterproof material.

[0002]

2. Description of the Related Art Conventionally, asphalt waterproofing method has been widely used in the field of construction in the field of construction because it has excellent waterproofness, durability and reliability, and is easy to construct and economically advantageous. Have been. As the asphalt waterproofing fabric in the asphalt waterproofing method, a polyester nonwoven fabric is particularly often used, and recently, an asphalt waterproofing fabric obtained by combining a polyester nonwoven fabric with glass fiber is used (for example, Japanese Patent No. 3103253 and US Pat. No. 518550). Issue).

[0003] However, in the former, a polyester nonwoven fabric layer and glass fiber are entangled and laminated by a needle punch, and a heat treatment and / or a resin impregnation treatment is performed to obtain an asphalt roofing base fabric. When the base fabric is slit in the inspection step, there is a drawback that the glass fiber jumps out at the end of the slit surface (base fabric cut surface). When asphalt processing such a base cloth,
The glass fiber that jumps out to the end pierces the worker's hand, the edge position control malfunctions during the machining process, or the glass fiber jumps out to the end of the processed product,
The problem was that the appearance was poor.

Further, when resin processing is performed without inserting glass fiber in advance so that glass fiber does not fly out at the end of the slit surface (cut surface of base cloth), the influence of shrinkage stress in the drying zone and the setting step of the resin processing step. Swelling occurs in the place where the reinforcing yarn is not inserted, and the result is that the folding wrinkles are promoted from that place, and there is a disadvantage that the product yield is deteriorated, and the obtained base fabric is
Although the glass fiber does not protrude to the end of the slit surface (base fabric cut surface) in appearance, the reinforcing fiber of the glass fiber is not inserted into the end when asphalt processing, so due to the thermal stress at the time of asphalt impregnation There was a drawback that ear dripping occurred and processability deteriorated remarkably. Further, since the obtained asphalt waterproofing base fabric is also subjected to thermal distortion, there is a drawback that a wavy occurs at the end of the product and the function as a waterproofing layer cannot be achieved. In the latter case, the glass fiber is pulled out from the krill in the polyester non-woven fabric manufacturing process, and the glass fiber is inserted into the intermediate layer of the polyester non-woven fabric. Workability is very poor, and since glass fibers are inserted in the polyester nonwoven fabric manufacturing process, there are problems such as an increase in equipment cost and an installation place, and an increase in cost.

[0005]

SUMMARY OF THE INVENTION The present invention is free from the above-mentioned disadvantages of the conventional base fabric such as asphalt waterproofing, that is, the excessive increase in the cost of the glass fiber reinforcing layer.
Eliminates problems caused by glass fiber spilling out from the end of the base fabric, excels in integration between the base fabric and impregnating agents such as asphalt, and has a high initial strength and is suitable as a base fabric for waterproofing materials with excellent workability. It is an object of the present invention to provide a fiber reinforced laminated nonwoven fabric.

[0006]

That is, the present invention meeting the above-mentioned object is as follows. 1. It is a laminated nonwoven fabric in which a plurality of glass fibers, a plurality of reinforcing yarns other than glass fibers and / or a soaked yarn are inserted between two layers of nonwoven fabric, and the reinforcing fibers and / or glass fibers and non-glass fibers are inserted. Glass fiber reinforced laminate characterized in that the original yarns are present in parallel with each other in the longitudinal direction of the laminated nonwoven fabric, and the reinforcing yarns and / or the original yarns other than the glass fibers are present at least at both ends of the laminated nonwoven fabric. Non-woven fabric. 2. A plurality of glass fibers and a plurality of reinforcing yarns and / or non-woven yarns other than the glass fibers are inserted between the two layers of nonwoven fabric, needle-punched, and then heat-pressed and / or pressed.
Or a glass fiber reinforced laminated nonwoven fabric which has been subjected to a resin impregnation treatment, in which reinforcing yarns other than the glass fibers and / or original yarns are inserted according to the tailoring width so that the inserted yarns are present at both ends. A glass fiber reinforced laminated nonwoven fabric characterized in that the glass fiber is prevented from jumping out at the cut end face by cutting and tailoring. 3. The glass fiber according to any one of the above items 1 or 2, wherein the specific volume of the reinforcing yarn and / or the soaked yarn other than the glass fiber is 0.6 to 1.8 of the specific volume of the glass fiber. Reinforced laminated nonwoven fabric. 4. The total insertion amount of the reinforcing yarn is 8 to 25 g / m ² , and the ratio of the reinforcing yarn other than the glass fiber and / or the original yarn in the reinforcing yarn is 3 to 15% by mass based on the total inserted yarn. 4. The glass fiber reinforced laminated nonwoven fabric according to any one of the above items 1 to 3, wherein

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The nonwoven fabric of the present invention may be either a long-fiber nonwoven fabric or a short-fiber nonwoven fabric.
When high strength is required due to asphalt impregnation or the like, a long-fiber nonwoven fabric is preferable. The long-fiber nonwoven fabric is formed by, for example, a known spun bond method or melt blow method, and is thermocompression-bonded as necessary. As the short fiber non-woven fabric, known needle-punched non-woven fabric, thermo-compression non-woven fabric, binder-treated non-woven fabric, and the like can be used, and are not particularly limited.

Examples of the material of the nonwoven fabric include natural fibers such as cotton, wool and silk, semi-synthetic fibers such as rayon, synthetic fibers such as polyester, polyamide, polyolefin, PVA and vinylon, high-strength polyethylene fibers and aramid fibers. It is a high modulus fiber or the like, and is not particularly limited.

Among synthetic fibers, polyester fibers are preferred from the viewpoints of ease of production, balance between performance and cost, utilization of recycled materials, and the like. Polyester fibers include polyethylene terephthalate, polybutylene terephthalate, etc., as well as isophthalic acid, adipic acid, diethylene glycol, trimethylene glycol,
Copolymerized polyester such as polytetramethylene glycol, polyethylene naphthalate, and copolymers thereof can also be used.

The basis weight of the nonwoven fabric to be laminated is appropriately selected according to the required properties, but is usually 40 to 500 g / m ^2.
It is 40 ~ from the relationship of performance, product weight, cost, etc.
200 g / m ² is preferred. The fineness of the nonwoven fabric is not particularly limited, but is usually 1 to 20 denier, and preferably 2 to 15 denier from the viewpoint of ease of production.

When the non-woven fabric is a synthetic fiber, it is usually melt-spun to form a web. However, if necessary, an opening-improving agent is used in the melt-spinning step, and an oxidizing agent is used in the spinning or web-forming step. Inhibitors, stabilizers, ultraviolet absorbers and the like can be added. When the nonwoven fabric is not a synthetic fiber or non-thermoplastic, known hot-melt type binder fibers such as polyester, polyamide, and polyethylene can be mixed.

As the glass fiber inserted between the two layers of nonwoven fabric, either a multifilament or a monofilament may be used, and a known glass fiber can be used. The fineness of the glass fiber is usually about 30 to 75 tex, and the wire diameter is preferably 0.5 mm or less. If the fineness of the glass fiber is increased, the fiber is likely to be raised on the surface to cause irregularities, and if the fineness is reduced, the desired initial strength is hardly obtained.

The amount of reinforcing yarn (fiber) inserted in the present invention is preferably 8 to 25 g / m ² in terms of mass. The ratio of the reinforcing fibers (yarns) other than the glass fibers in the reinforcing fibers is preferably 3 to 15% by mass with respect to all the inserted fibers. When the ratio of the reinforcing yarn other than the glass fiber exceeds 15% by mass, it is conceivable that the edge strength of the laminated nonwoven fabric is reduced and ear dripping may occur in the asphalt impregnation step. When the ratio of the reinforcing yarn other than glass fiber is less than 3% by mass,
There is a possibility that glass fibers may fly out from the end of the laminated nonwoven fabric.

As the reinforcing fibers (yarns) other than glass fibers in the present invention, high-strength synthetic fibers, carbon fibers, metal fibers and the like can be used. Examples of the synthetic fibers include polyethylene terephthalate, polybutylene terephthalate, and polyaramid. And fibers such as polyetherketone, polyethersulfone, and polybenzoxazole. These fibers have a tensile strength of 4.0 g /
dtex or more, elongation 40% or less, 180 ° C dry heat shrinkage 3.0
% Is preferable. 4.0 g / dt tensile strength
If it is less than ex, the reinforcing effect is low, and if the dry heat shrinkage at 180 ° C. exceeds 3.0%, it may shrink due to heat history during asphalt processing, and warpage may occur as an asphalt product.

In the present invention, the reinforcing yarn other than glass fiber
The specific volume is in the range of 0.6 to 1.8 of the specific volume of the glass fiber.
It is preferable that the fineness is within the range. Specific gravity of glass fiber
Is a catalog issued in March 1998 by Nippon Sheet Glass Co., Ltd.
According to the glass density is 2.6g / cm ^ThreeAnd converted to specific volume
Then 0.385 cm^Three/ G. Gala in the detailed description above
When 34 tex is used, glass fiber is used.
The fineness of the reinforcing yarn other than fiber is (340 dtex x 0.385 cm^Three/ G ×
0.6)-(340 dtex x 0.385 cm^Three /G×1.8)=7
8 to 209 dtex. That is, the glass fiber in the present invention
The specific volume of the reinforcing yarn other than that is 0.6% of the specific volume of the glass fiber.
It is within the range of ~ 1.8. Preferably 0.8 to 1.2 range
It is in the box. Less than 0.6 of the specific volume of glass fiber
And the heat treatment, the embossing roll and flat calendar
-When thermocompression bonding is performed between
No load is applied and thermocompression bonding is not possible, and the effect as a reinforcing fiber
I can't get it. Conversely, the specific volume of glass fiber
When using reinforcing yarns other than glass fiber exceeding 1.8
Indicates that a linear pressure load is excessively applied to reinforcing yarns other than glass fiber,
The fiber reinforcement layer is broken and the effect as reinforcement fiber cannot be obtained.
No. By embodying in the appropriate area of the present invention,
When thermocompression bonding between
Linear pressure load is applied evenly to reinforcement yarns other than fibers and glass fibers.
The effects of the present invention can be obtained.

The soaked yarn in the present invention is a fiber which is colored at the stage of spinning or a fiber which has been colored after spinning. For example, a fiber spun by adding a coloring agent to a spinning dope such as polyester, Fibers that are originally colored, such as carbon fibers, can be used as long as they are inserted between the non-woven fabrics and can be visually distinguished from other fibers. Thereby, it is possible to prevent the glass fiber from flying out at the cut end face.

The plurality of glass fibers in the present invention are inserted at predetermined intervals in parallel with the longitudinal direction of the nonwoven fabric, and the insertion pitch is preferably 3 to 30 mm, more preferably 3 to 10 mm. When the insertion pitch is increased, the surface of the nonwoven fabric tends to be uneven due to shrinkage of the nonwoven fabric after impregnation with asphalt, and when the insertion pitch is decreased, there is no problem in physical properties, but the amount of fibers used is increased, which is uneconomical.

[0018] A plurality of reinforcing yarns and / or uncoated yarns other than glass fibers are inserted in the same manner as glass fibers, but when these fibers are cut into a tailoring width, these fibers are placed at both ends. Is appropriately inserted according to the tailoring width so that the glass fiber can be prevented from jumping out at the cut end face.

In the present invention, a plurality of glass fibers and a plurality of reinforcing yarns and / or non-glass yarns other than the glass fibers are inserted between the two layers of nonwoven fabric and immediately subjected to needle punching.
Needle punching is performed to improve the strength of the laminated nonwoven fabric by entanglement of the inserted yarn and the nonwoven fabric.
It is preferable to set the number to 0 / cm ² . Needle density 20 /
When the density is less than cm ² , the confounding property is poor and the laminating effect is hardly exhibited, and when the needle density exceeds 120 needles / cm ² , the unevenness of the surface of the laminated nonwoven fabric becomes large and the glass fiber is easily broken.

The laminated nonwoven fabric subjected to the needle punching is
Next, a thermocompression treatment and / or a resin impregnation treatment is performed. The purpose of further heat-treating the nonwoven fabric integrated in the needle punching step is to provide rigidity as a base fabric by fixing the fibers on the front and back and filling the distance between the fibers in the closest packing. As a heat treatment method, it is preferable to perform thermocompression bonding between the embossing roll and the flat calender. According to this method, rigidity can be imparted while suppressing a decrease in initial strength. The linear pressure during processing is 5-50kg /
cm, more preferably 10 to 30 kg / cm. In the case of a low linear pressure, the heat fixation of the two-layer fiber nonwoven fabric is insufficient, and it is difficult to obtain rigidity as a base fabric. Further, when processing is performed in a region of high linear pressure, the glass fiber inserted into the intermediate layer is cut by the embossing roll, and the initial stress of the obtained base fabric tends to be significantly reduced. Furthermore, in the thermocompression treatment, if a flat / flat calender roll is used, the two-layer nonwoven fabric can be thermocompression-bonded and the distance between the fibers can be filled in a close-packed manner, but the drapability increases.

It is preferable that the nonwoven fabric obtained by integrating the nonwoven fabric by the needle punching process and further heat-pressing the nonwoven fabric is impregnated with a binder resin in order to firmly fix the intersections between the fibers of the nonwoven fabric. However, when the binder fibers are mixed in the nonwoven fabric, the binder resin impregnation treatment can be omitted.

As the binder resin to be used, known resins such as thermosetting resins such as urea-based, melamine-based, acrylic-based, and epoxy-based resins, and thermoplastic resins can be used. Is done. The adhesion amount of the binder resin is preferably 3 to 50% by mass, and particularly preferably 5 to 30% by mass of the laminated nonwoven fabric. If the amount of the binder attached is too large, the impregnating property of asphalt or the like to be impregnated later is reduced. On the other hand, if the amount is too small, the process tension in the asphalt impregnation step or the like may not be constant and breakage or winding trouble may occur.

The glass fiber reinforced laminated nonwoven fabric of the present invention can be used as various base fabrics such as a waterproofing material, a heat insulating material, a soundproofing material, an insulating material and a reinforcing material, as a waterproofing agent such as asphalt, an epoxy resin,
Thermosetting resins such as unsaturated polyester resins, and thermoplastic resins such as polyvinyl alcohol resins and polyurethane resins are impregnated or laminated for use in various applications.

[0024]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples. Example 1 Melting point: 260 ° C., intrinsic viscosity: 0.63 (dl /
g) polyethylene terephthalate of 0.30 m in diameter
m, using a spinning nozzle having a single hole discharge rate of 1.5 g / min. and a hole number of 300 holes, discharging from the spinning nozzle at a melting temperature of 285 ° C., spinning at a spinning speed of 4500 m / min. After collection, the fibers were collected on a metal net to form a web. The web was weakly pressed with a thermocompression roll to form a nonwoven fabric. The basis weight of the obtained nonwoven fabric is 70 g /
m ² .

The two layers of the nonwoven fabric obtained by the above-mentioned production method are installed so that they can run in parallel, and between the two layers of nonwoven fabric, a glass fiber, a reinforcing yarn other than glass fiber, and a soaked yarn are inserted. The nonwoven fabric was installed so as to be able to run from the krill in a desired number and at a desired interval in parallel with the longitudinal direction of the nonwoven fabric.

The glass fiber is a glass fiber having a fineness of 34 tex (EC 934 Z28 T30 VETROTEX), and the reinforcing yarn other than the glass fiber is a polyester multifilament of 160 dtex / 48f manufactured by Toyobo Co., Ltd. 340 dtex × 0.385 cm ³ /g×1.2), and the original yarn used was a 56 dtex 24f polyester multifilament (manufactured by Toyobo Co., Ltd.) using carbon as a coloring agent. The insertion pitch is 3m parallel to each other in the longitudinal direction
m pitch, insertion amount of all inserted reinforcing yarns is 11 g
/ M ² , the amount of polyester multifilament inserted is 5
%, And the polyester multifilament yarn was set so as to be located at least at both ends (the original yarn was at the extreme end) of the laminated nonwoven fabric.

At the place where the two layers of the nonwoven fabric and the inserted yarn were overlapped while running, each was entangled with a nitrile punch machine. The needle used is a needle (FPD 1-40) manufactured by Organ Co., and the needle density is 60 needles / cm.
^{And 2} .

The laminated nonwoven fabric obtained by the needle punching treatment is heat-pressed between an embossing roll at 185 ° C. and a flat calender, and then impregnated with a mixed resin of a urea melamine resin and an acrylic resin by an ordinary method. Table 1 shows the properties of the glass fiber reinforced laminated nonwoven fabric obtained by drying and heat-treating and then cutting into a tailoring width in the longitudinal direction. On the cut end face of the obtained glass fiber reinforced laminated nonwoven fabric, no glass fiber jumped out was observed.

Comparative Example 1 Table 1 shows a glass fiber reinforced laminated nonwoven fabric obtained in the same manner as in Example 1 except that no reinforcing yarn other than glass fiber was used. Many glass fibers were found to be cut off at the cut end face of the obtained glass fiber reinforced laminated nonwoven fabric, and the appearance was poor, and the handling was dangerous.When this was used in the asphalt impregnation step, Trouble was expected.

(Comparative Example 2) In Example 1, the glass fiber at the end portion was removed in advance without using any reinforcing yarn other than the glass fiber (the removed glass fiber had a pitch of 3 mm x 1).
Table 1 shows the glass fiber reinforced laminated nonwoven fabric obtained in the same manner as in Example 1 except for 5 rows = 45 mm). The glass fiber reinforced laminated nonwoven fabric does not show any glass fiber protrusion on the cut end face, but the glass fiber at the end of the product is pulled out, so the average value of the physical properties in the width direction is reduced, and the resin impregnation is performed. Wrinkles occurred during the process, and it was not in a state where stable production was possible.
Further, when the obtained product was set in an asphalt impregnation step, ear dripping occurred at both ends in the impregnation step, and the appearance and performance as a waterproof base cloth were poor.

[0031]

[Table 1]

The measurements of the physical properties in Table 1 are based on the following methods.・ 3% elongation stress and tensile strength (N / 5c)
m): According to the cut-stripping method described in JIS L-1096, using a constant-speed elongation-type tensile tester (Tensilon manufactured by Orientec), from the product width of the laminated nonwoven fabric, 50 mm in width, 200 mm in length, and 20 points per sample , Measured at a gripping distance of 100 mm and a pulling speed of 200 mm / min.
The average values of the obtained stress at 3% elongation and tensile strength were defined as stress at 3% elongation (N / 5 cm) and tensile strength (N / 5 cm).

[0033]

According to the present invention, there is no drawback that the glass fiber jumps out at the end of the slit surface (cut surface of the base cloth), and the glass fiber that jumps out to the end at the time of asphalt processing or the like is removed. There is no problem such as piercing to the edge or malfunction of the edge position control during the machining process,
A glass fiber reinforced laminated nonwoven fabric useful as various base fabrics such as a waterproof material, a heat insulating material, a soundproof material, an insulating material, and a reinforcing material can be provided.

[Brief description of the drawings]

FIG. 1 shows a glass fiber reinforced laminated nonwoven fabric of the present invention.
It is a schematic diagram which illustrates the insertion state of the reinforcing thread before the cutting process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Reinforcing yarn other than glass fiber 2 ... Glass yarn 3 ... Original yarn 4 and 5 ... Product tailoring width 6 ... Cutting knife 7 ... Glass fiber reinforced laminated nonwoven fabric

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Satoshi Sasabe 10-24 Toyo-cho, Tsuruga-shi, Fukui Toyobo Co., Ltd. Inside Tsuruga Plant (72) Inventor Sumio Moriguchi 10-24 Toyo-cho, Tsuruga-shi, Fukui No. Toyobo Co., Ltd. Tsuruga Factory F-term (reference) 4F100 AG00C AK25 AK35 AK42 AL05 BA03 BA06 BA10A BA10B DG01C DG04 DG06 DG15A DG15B EC03 EC032 EC09 EC092 EJ42 EJ422 GB07 JD05 JL01 4L032 AA03 AB04 A04A04A04 BA03 BA16 CB01 CC13 EA10

Claims (4)

[Claims] Claims: 1. A plurality of glass fibers between two layers of nonwoven fabric,
A laminated nonwoven fabric in which a plurality of reinforcing yarns and / or non-glass yarns other than glass fibers are inserted, wherein the glass fibers and the non-glass fiber reinforcing yarns and / or non-glass yarns are parallel to each other in the longitudinal direction of the laminated nonwoven fabric. A glass fiber reinforced laminated nonwoven fabric, characterized in that reinforcing yarns and / or soaked yarns other than the glass fiber are present at least at both ends of the laminated nonwoven fabric. 2. A plurality of glass fibers and a plurality of reinforcing yarns and / or non-woven yarns other than glass fibers are inserted between two layers of nonwoven fabric, needle-punched, and then heat-pressed and / or a binder. A resin-impregnated glass fiber reinforced laminated nonwoven fabric, in which reinforcing yarns other than the glass fibers and / or original yarns are inserted according to the tailoring width, and cut so that the inserted yarns are present at both ends. A glass fiber reinforced laminated nonwoven fabric characterized in that the glass fiber is prevented from jumping out at the cut end face by tailoring. 3. The specific volume of the reinforcing yarn and / or the original yarn other than the glass fiber is 0.6 to 1.8 of the specific volume of the glass fiber.
The glass fiber reinforced laminated nonwoven fabric according to any one of claims 1 and 2, wherein 4. The total insertion amount of the reinforcing yarn is 8 to 25 g / m ^2.
And reinforcing yarns other than glass fibers among the reinforcing yarns and / or
The glass fiber reinforced laminated nonwoven fabric according to any one of claims 1 to 3, wherein the ratio of the soaked yarn is 3 to 15% by mass based on all the inserted yarns.