JP2002038109A - Fever bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means by which the adhesive on an adhesive surface of a material to be heated can efficiently be heated and can rapidly be cured even if the surface of the material to be heated is a bent surface such as those of a rain gutter and a pipe or has unevenness. SOLUTION: This heating bag is obtained by storing a heating composition capable of generating the heat by contacting with oxygen in the air, in a flat bag regulated so that when the heating composition is allowed to generate the heat at 20±1 deg.C in 55-70% surrounding humidity in the air under a windless condition, the maximum temperature of the surface of the heating composition may be >=75 deg.C. The heating bag can be used as a heating means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating bag, and more particularly, to a heating bag for heating and curing an adhesive on a bonding surface of an object to be heated by bringing the adhesive into close contact with the surface of the object to be heated. Further, the present invention relates to a heating bag capable of efficiently heating even if the surface of the object to be heated has a curved surface or irregularities.

[0002]

2. Description of the Related Art Conventionally, various types of adhesives have been used in various fields. Many adhesives, when applied to the surface of the object to be bonded, in order to sufficiently act on the intermolecular force, it is necessary to give fluidity to make the adhesive molecules approach the molecules of the object to be bonded, After bonding, the solidification can be accelerated by heating. Typical examples are phenolic adhesives, epoxy adhesives, polyester adhesives, polyurethane adhesives,
Vinyl acetate adhesive, polyvinyl alcohol adhesive,
Examples include a vinyl chloride adhesive, a polyethylene adhesive, a cellulose adhesive, a chloroprene adhesive, and a nitrile rubber adhesive. Also, objects to be bonded are paper, wood,
Plastics, ceramics, metals, etc. cover a wide range. These adhesives are based on the type of object to be bonded,
Conditions such as working conditions, environment, economy, etc.
It is appropriately selected and used in consideration of heat resistance, durability, chemical resistance and the like.

[0003] The components of the above-mentioned various kinds of adhesives cannot be generally described, but an adhesive which is liquid at ordinary temperature generally comprises a binder such as resin or rubber and a binder such as water or an organic solvent. Solvents, acid catalysts, curing agents such as polymerization initiators, fillers, pigments,
It is composed of a combination of a thickener and the like. When an adhesive is used, the surface of the adhesive surface is cleaned beforehand, and then the adhesive is applied manually by a brush, a roller or the like, or by a spray gun or the like. The adhesive requires some time to cure after joining the surfaces to be bonded,
Usually, the adhesive surface is fixed so as not to move. In addition, the curing of the adhesive is preferably fast, and it is practiced to accelerate the curing by externally heating to accelerate the polymerization reaction of the binder, to absorb and diffuse the solvent in the adherend, or to evaporate the solvent. ing. Therefore, an attempt has been made to fix an object to be bonded with a jig or the like, and to heat the bonded portion by using a heater installed inside the jig or the like, or by heating from the outside through a jig or the like.

[0004]

However, if the surface of the object to be heated to be heated is curved or has irregularities, there is a gap between the jig for fixing the object to be bonded and the object to be bonded. And the bonded portion cannot be efficiently heated. For example, various adhesives are also used in the fields of construction and civil engineering, but the surfaces of gutters, pipes, etc. have curved surfaces. There was no means to speed up the bonding of the two. Therefore, the problem to be solved by the present invention is that it is possible to efficiently heat and quickly cure the adhesive even when the surface of the object to be heated is a curved surface or has irregularities such as a gutter or a pipe. Is to provide a means.

[0005]

Means for Solving the Problems The present inventors have made intensive studies to solve these problems, and as a result, the exothermic composition which generates heat upon contact with oxygen in the air has air permeability and flexibility. It is housed in a flat bag and has an ambient temperature of 20 ± 1 ° C., an ambient humidity of 55 to 70%, and a maximum temperature of the exothermic composition of 75 ° C. when the exothermic composition is heated in air in a windless state.
By using the above-mentioned heating bag and bringing it into close contact with the surface of the object to be heated, even if the surface of the object to be heated is curved or uneven, the adhesive surface is efficiently heated and the adhesive is cured quickly. It has been found that it is possible to achieve the present invention.

That is, the present invention relates to a heat generating bag for heating and curing an adhesive on an adhesion surface of an object to be heated by bringing the adhesive into close contact with the surface of the object to be heated. A heat-generating composition that generates heat by contact with oxygen in the air is stored in a flat bag having air permeability, which is created by laminating the outer peripheral portions of each other. When the exothermic composition is heated in air having a humidity of 55 to 70% and no wind, the maximum temperature of the surface of the exothermic composition is 7
An exothermic bag characterized by a temperature of 5 ° C. or higher.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The heating bag according to the present invention adheres to the surface of the object to be heated even if the surface of the object to be heated has a curved surface or has irregularities. A heating bag that can be cured by heating, wherein the heating composition that generates heat upon contact with oxygen in the air is contained in a flat bag, and has an ambient temperature of 20 ± 1 ° C. and an ambient humidity of 55 to 70%. ,
The heat generating bag has a maximum temperature of 75 ° C. or higher on the surface of the heat generating composition when the heat generating composition generates heat in air in a windless state. According to the heating bag of the present invention, the heating bag can be brought into close contact with the object to be heated even if the surface of the object to be heated is curved or uneven, so that the object to be heated can be efficiently heated and the adhesive can be quickly applied. It is possible to cure. In addition, even when the object to be heated is heated from below or from the side, the object to be heated can be efficiently heated without causing the exothermic composition to sag in the heating bag.

The objects to be heated to which the heating bag of the present invention can be applied include, for example, the above-mentioned gutters, pipes, various types of workpieces, etc., but are not particularly limited thereto. In addition, as an adhesive for bonding an object to be heated, a urea-based adhesive, a melamine-based adhesive, a phenol-based adhesive, an epoxy-based adhesive, a polyester-based adhesive, a polyurethane-based adhesive, and a polyaromatic-based adhesive are used. Adhesives, vinyl acetate adhesives, polyvinyl alcohol adhesives, polyvinyl acetal adhesives, vinyl chloride adhesives, acrylic adhesives, polyamide adhesives, polyethylene adhesives, cellulose adhesives, chloroprene adhesives And a nitrile rubber-based adhesive, a styrene rubber-based adhesive, a polysulfide-based adhesive, a butyl rubber-based adhesive, and a silicone rubber-based adhesive.

In the present invention, the exothermic composition which generates heat upon contact with oxygen in the air is a mixture of oxidizable metal powder, activated carbon, an inorganic electrolyte, water, a water retention agent, and the like. used. The oxidizable metal powder includes iron powder, aluminum powder, and the like. Usually, iron powder is used, and reduced iron powder, atomized iron powder, electrolytic iron powder, and the like are used.
Activated carbon is used not only as a reaction aid but also as a water retention agent. Usually, coconut shell charcoal, wood flour charcoal, peat charcoal and the like are used. As the inorganic electrolyte, alkali metals, alkaline earth metals, heavy metal chlorides, and alkali metal sulfates are preferable,
For example, sodium chloride, potassium chloride, calcium chloride, magnesium chloride, ferric chloride, sodium sulfate and the like are used.

The water retention agent is not particularly limited as long as it has high water retention and does not cause deterioration during long-term storage of the heat generating bag. For example, perlite powder, vermiculite, wood powder, polymer water-absorbing agent Agents and the like are used. The composition ratio of the exothermic composition varies depending on the purpose of use of the exothermic bag and cannot be specified unconditionally, but when used for accelerating the curing of the adhesive, it is set so as to obtain a relatively high temperature. . Usually, the composition ratio in the exothermic composition is 35 to 60% by weight of oxidizable metal powder and 4 to 25% by weight of activated carbon.
%, Water is 10 to 30 wt%. In addition, if desired, a hydrogen generation inhibitor, an anti-caking agent, and the like can be added.

The flat bag according to the present invention holds the exothermic composition inside the bag, does not break during use, and has air permeability necessary for obtaining heat generation performance.
A flat bag packaging material configuration comprising a flexible packaging material so that the heating bag can be in close contact with the heating object even when the surface of the heating object has a curved surface or unevenness. The configuration is such that a gas-permeable packaging material is used on one side of the bag and a non-air-permeable packaging material is used on the other side, or a gas-permeable packaging material is used on both sides of the bag. But,
When used to accelerate the curing of adhesives that are adversely affected by moisture evaporating from the heating bag, use a non-breathable wrapping material on the side in contact with the heated surface and use a permeable wrapping material on the other side. Preferably, when used for accelerating the curing of an adhesive which is not affected by moisture, a breathable packaging material may be used on both sides.

When the heating bag is used for accelerating the curing of the adhesive, the temperature is raised to 75 ° C. or more in a few minutes.
Since it is required to end the heat generation in about 0 to 60 minutes, a packaging material having a relatively large ventilation rate is used. Therefore, the breathable packaging material of the flat bag is
The pore size of the non-breathable film or the laminated packaging material of the non-breathable film and the nonwoven fabric is set to 0.05 to 0.
A packaging material provided with a needle hole of 7 mm, a packaging material made of a laminated nonwoven fabric of polyolefin fibers set to have an air permeability of 50 seconds or less according to the JIS P8117 air permeability test method, or a JIS P8117 air permeability test method It is preferable to use a packaging material having a porous film having an air permeability of 500 seconds or less and a hole having a hole diameter of 0.7 mm or less for preventing swelling of the heat generating bag during heat generation. Incidentally, one or several holes having a hole diameter of 0.7 mm or less for preventing swelling are usually provided.

Here, the above-mentioned laminated nonwoven fabric of polyolefin fibers refers to laminated fibers of polyethylene, polypropylene, etc., which are thermocompression-bonded and have pores having a maximum pore diameter of 0.1 μm to 20 μm by a methanol bubbling method, and have air permeability. The nonwoven fabric is a controlled nonwoven fabric, and commercially available products include, for example, Tyvek manufactured by DuPont. The porous film has a maximum pore size of 0.0
A film having fine through-holes of about 01 μm to 10 μm, for example, a film provided with through-holes by biaxially stretching a synthetic resin film, or an inorganic fine powder such as calcium carbonate in molten polyethylene or polypropylene. And then extruded into a film,
The obtained film is further stretched to provide a through hole. Commercially available products of these porous films include, for example, Porum and NF sheet manufactured by Tokuyama Corporation, Cellpore manufactured by Sekisui Chemical Co., Ltd., and Breslon manufactured by Nitto Denko Corporation.

The heat generating bag of the present invention has an ambient temperature of 20 ± 1 ° C. by using the heat generating composition and the packaging material described above.
The maximum temperature of the surface of the heat-generating composition when the heat-generating composition is heated in the air having an ambient humidity of 55 to 70% and no wind (0.5 m / s or less) is 75 ° C or higher, preferably 80 ° C or higher. Set to reach. In the present invention, the temperature of the surface of the heat-generating composition is measured by suspending the heat-generating bag with a thread, a string, or the like, or by a method according to the method so as not to come into contact with other objects.

In the flat bag for storing the heat-generating composition according to the present invention, the air-permeable packaging material and the non-air-permeable packaging material are usually overlapped so that the heat-fusible surfaces face each other, and The parts are bonded by heating and fusion to form a bag, and the exothermic composition is filled to form a heating bag. At this time, the bonded portion of the flat bag is preferably set to have an average width of 10 to 100 mm. When the average width is smaller than 10 mm, the adhesiveness to the object to be heated is deteriorated, and when the average width is larger than 100 mm, the handleability is deteriorated.

Here, the width of the bonded portion means the shortest distance from the opposing outer periphery at an arbitrary point on the inner circumference of the bonded portion of the flat bag. When the shape of the outer circumference and the inner circumference of the bonding portion is a circle or an ellipse, it means the shortest distance between the opposing outer circumference circle or the ellipse at an arbitrary point on the inner circumference circle or the ellipse. Further, even when the shape of the outer periphery of the bonded portion is a square or a rectangle and the shape of the inner periphery is a circle or an ellipse, the shortest distance between the opposing outer straight line at any point on the inner circle or the ellipse Means If the outer and inner shapes are other than those described above, the width of the bonded portion is set according to the above.

The shape of the flat bag according to the present invention is as follows.
A trapezoid, rhombus, circle, ellipse, etc. can also be used, but it is preferable to use a square or a rectangle in the manufacturing process. In such a case, the average width of the four sides of the flat bag should be 10 It is preferable that the distance is set to be about 100 mm. In the present invention, the lower limit of the width of the bonded portion is 5 mm regardless of the shape of the flat bag.
It is preferred that The size of the heating bag of the present invention differs depending on the purpose of use, the size of the object to be heated, the place where the heating bag is bonded, and the like, and cannot be specified unconditionally. Up to the size of the third row of the standard A row is used.

Further, the heat generating bag of the present invention is preferably provided with a pressure-sensitive adhesive layer on one surface of the flat bag to be bonded to the object to be heated. The pressure-sensitive adhesive layer has a better attachment property to the object to be heated as it covers a wider area, and preferably has a surface of 30% or more of the bonded portion on one side of the flat bag.
More preferably, it is provided on 50% or more of the surface. When one side of the flat bag is a breathable packaging material and the other side is a non-breathable packaging material, it is preferable to provide an adhesive layer on the non-breathable packaging material side.

The pressure-sensitive adhesive layer can be adhered and fixed to the object to be heated, without causing transfer to the surface of the object to be heated.
Any material can be used as long as it does not deteriorate during long-term storage until it is used as a heating bag. For example, an acrylic acid-based polymer or the like is used as a component thereof. The surface of the pressure-sensitive adhesive layer is usually covered with a release paper or the like until it is used. Further, the heat generating bag of the present invention is made of an outer air-permeable film such as polyethylene or polypropylene in order to shut off the outside air and prevent water from evaporating and escaping to the outside during use. Sealed in a bag.

[0020]

Next, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.

Example 1 A basis weight of 60 g / m ² and a thickness of 0.1 g / m ² were used.
14 mm, a laminated nonwoven fabric of polyolefin fibers having an air permeability of 2.0 seconds according to JIS P8117 air permeability test method,
A polyethylene film having a thickness of 60 μm was laminated, cut into a length of 170 mm and a width of 145 mm, and bonded by heating and welding the three peripheral portions to form a bag shape, thereby forming a flat bag. In addition, the width of one set of two opposite sides of the 170 mm long bonded portion was set to 40 mm, and the width of the other bonded portion was set to 5 mm.

Next, a pressure-sensitive adhesive layer is provided by applying an acrylic ester-based pressure-sensitive adhesive to almost the entire surface of the pair of opposed two sides on the polyethylene film side of the flat bag. A release paper was coated on the surface of the pressure-sensitive adhesive layer. In addition, iron powder 25g, activated carbon 10g, wood powder 2g,
A heating composition comprising 2 g of vermiculite, 1 g of a polymer water-absorbing agent, 2 g of sodium chloride, and 15 g of water is prepared under a nitrogen atmosphere, stored in the flat bag, and then bonded by heating and fusing the remaining one side. Was. Further, the heating bag was sealed in a non-breathable outer bag, and left in a test room at a temperature of 20 ° C. and a relative humidity of 60% for about one week.

Five of the twenty-five heating bags prepared as described above were subjected to a heating test in a test room at a temperature of 20 ° C. and a relative humidity of 60%. In the heat generation test, after the heat generation bags were taken out of the outer bag, these heat generation bags were hung with a thread so as not to contact other objects, and the temperature of the surface of the heat generation composition at the center of the heat generation bag was measured. Table 1 shows the results.
During the heat generation test, the test room was set in a windless state. Also,
Table 1 shows the average temperature of the five pieces, and the elapsed time is based on the time when the outer bag was opened.

The remaining 20 heating bags were bonded in a test room at a temperature of 20 ° C. and a relative humidity of 60% using two plastic cylindrical tubes each having an outer diameter of 5 cm, a thickness of 2 mm, and a length of 10 cm. The test was performed. To bond the plastic cylindrical pipes, two cylindrical pipes are arranged vertically so that the circular cross-sections are in contact with each other, and a liquid phenolic adhesive is applied to this cross-section and immediately pressed against each other, and the heat generating bag is pressed. This was carried out by removing the release paper from the outer bag, peeling off the release paper, and attaching the release paper to the side surface of the cylindrical tube so as to cover the cross section. Next, 10 minutes after the start of bonding, five samples were pulled with a force of 20 kg in a direction perpendicular to the bonding surface,
It was checked whether the adhesive was solidified. After another 20 minutes,
After 40 minutes and 60 minutes, the solidification state of the adhesive was similarly examined. Table 2 shows the results.

(Example 2) The laminated nonwoven fabric of the heat generating bag in Example 1 was weighed 80 g / m ² , thickness 0.16 mm, and J
Twenty heat generating bags were prepared in the same manner as in Example 1 except that the laminated nonwoven fabric of polyolefin fibers having a gas permeability of 5 seconds according to IS P8117 gas permeability test method was used. This heating bag is sealed in a non-breathable outer bag, and the temperature is 20 ° C. and the relative humidity is 60.
% Of the test room for about one week. Thereafter, a heat generation test and an adhesion test were performed in the same manner as in Example 1. Table 1 shows the results
And Table 2.

(Comparative Example 1) The laminated nonwoven fabric of the heat generating bag in Example 1 was bonded to a nylon nonwoven fabric having a basis weight of 50 g / m ² and a thickness of 0.1 mm by bonding a polyethylene film having a thickness of 60 μm to a JISP8117 air permeability. Twenty heat generating bags were prepared in the same manner as in Example 1 except that the laminated packaging material provided with a needle hole so that the air permeability according to the test method was 20 seconds was used. This heating bag is sealed in a non-breathable outer bag,
It was left in a test room at 0 ° C. and a relative humidity of 60% for about one week. Thereafter, a heat generation test and an adhesion test were performed in the same manner as in Example 1. The results are shown in Tables 1 and 2.

[0027]

[Table 1]

[0028]

[Table 2]

[0029]

The heating bag of the present invention can be brought into close contact with the object to be heated even when the surface of the object to be heated is curved or uneven, such as rain gutters or piping. Can be efficiently heated and quickly cured.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Mamoru Takahashi 5181 Tamura, Hiratsuka-shi, Kanagawa F-Terminus in Hiratsuka Plant of Japan Pionics Co., Ltd. 3E064 AA05 BA26 BA30 BB03 FA06 GA04 HD08 HE01 HN01 4J040 CA071 CA081 CA091 CA141 DC021 DD021 DF001 EA011 EB051 EB111 EB131 ED021 EG001 EJ001 EK031 HA026 HA066 HA096 HA256 JA06 JA09 JB01 KA21 LA08 MA10 MB03 NA10 NA12 PB05

Claims (4)

[Claims] 1. A heating bag for heating and curing an adhesive on an adhesion surface of an object to be heated by closely contacting the surface of the object to be heated, wherein two flexible packaging materials are laminated. A heat-generating composition that generates heat upon contact with oxygen in the air is stored in a flat bag having air permeability formed by bonding the outer peripheral portions of each other, and has an ambient temperature of 20 ± 1 ° C. and an ambient humidity of 55 to 55. 70
%, Wherein the maximum temperature of the surface of the heat-generating composition when the heat-generating composition is caused to generate heat in air with no wind is 75 ° C. or more. 2. At least one flexible wrapping material is applied to a non-breathable film or a laminated wrapping material of a non-breathable film and a nonwoven fabric so as to have a permeability of 10 seconds or less according to JIS P8117 air permeability test method. The hole diameter is 0.05-0.7m
m, a packaging material made of a laminated nonwoven fabric of polyolefin fibers set to have an air permeability of 50 seconds or less according to the JIS P8117 air permeability test method, or a JIS P8117 air permeability test method The heat generating bag according to claim 1, wherein the heat generating bag is a packaging material in which a porous film having an air permeability of 500 seconds or less is provided with a hole having a hole diameter of 0.7 mm or less for preventing swelling of the heat generating bag during heat generation. 3. An average width of the bonded portion is 10 to 100 mm.
The heating bag according to claim 1, wherein 4. The heat generating bag according to claim 1, wherein an adhesive layer is provided on one surface of the bonding portion.