JP2002069406A - Adhesion method for joint sections of sponge cloth and its adhesion-structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesion method for joint sections of a sponge cloth used for a wet suit, dry suit, etc., and an adhesion-structure. SOLUTION: The adhesion method and structure are defined as such that, at a structure of sections of the sponge cloth laminated with clothes on one side or both sides of a sponge sheet, a butt-adhesion is performed using an adhesives prepared by combining a tackifying resin of 0-20 mass parts by solid- content conversion and a polychloroprene-based latex of 100 mass parts by solid-content conversion, and the structure is secured by the method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seam which is important for sewing sponge fabric used for marine sports wet suits and dry suits, fishing waders, shoes and bags, and repairing damaged parts. The present invention relates to a method of bonding parts.

[0002]

2. Description of the Related Art In marine sports products such as wet suits and dry suits, and fishing products such as waders and shoes,
In many cases, a sponge fabric in which a fabric is laminated on one or both sides of a sponge sheet such as foamed polychloroprene rubber or foamed polyurethane rubber is used. When manufacturing these products, there is a process of cutting and sewing the sponge fabric, where a polychloroprene (CR) solvent-based adhesive is applied to both sides of the cut surface of the two sponge fabrics, Glued by hand. However, since organic solvents such as toluene, ethyl acetate, and methyl ethyl ketone are used for CR solvent-based adhesives, the organic solvents volatilize in the workplace during the application of the adhesive, resulting in safety and hygiene for workers and environmental protection. Undesirably, reduction of the organic solvent has been desired.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, and has problems in health and safety and environment as in the case of using a conventional CR solvent-based adhesive. It is another object of the present invention to provide a bonding method and a bonding structure that can be bonded firmly at least as well as a conventional CR solvent-based adhesive, and that realize sufficient solvent resistance. In addition, the solvent resistance means that when the adhesive protruding from the seam of the sponge fabric is removed with an organic solvent, or when dirt attached during sewing work is wiped off with an organic solvent, the seam does not peel off. Is the required performance.

[0004]

Means for Solving the Problems As a result of repeated studies to achieve the above object, the present inventors have found that a polychloroprene-based latex is used in an amount of not less than 0 parts by mass per 100 parts by mass in terms of solid content. The above-mentioned problem is solved by a method of applying a water-based adhesive compounded in an amount of less than 20 parts by mass to a butt surface (cut surface) of a sponge dough, drying it as necessary, and then manually bonding it. That is, the present invention has been completed. That is, the present invention relates to a method of bonding cut surfaces of a sponge fabric in which a sponge sheet and a fabric are laminated, and in a structure of a joint portion of the sponge fabric, a polychloroprene-based latex is solidified on an abutting surface (cut surface). A process of applying an aqueous adhesive containing 0 to less than 20 parts by mass of a tackifier resin to 100 parts by mass in terms of solids, and optionally pressing the adhesive after drying the adhesive if necessary. And a bonding structure obtained by the bonding method. In this case, the polychloroprene-based latex contained in the adhesive is preferably a latex obtained by copolymerizing chloroprene and a carboxyl group-containing vinyl monomer.

Hereinafter, the contents of the present invention will be described in detail. As the sponge sheet in the present invention, a rubber or elastomer foam sheet is suitably used without any particular limitation. Specifically, natural rubber (NR), isoprene rubber (IR), styrene-butadiene rubber ( SB
R), butadiene rubber (BR), butyl rubber (II
R), ethylene-propylene rubber (EPM, EPD)
M), chloroprene rubber (CR), nitrile rubber (NB
R), open cells such as chlorosulfonated polyethylene (CSM), epichlorohydrin rubber, acrylic rubber, polyvulcanized rubber, silicone rubber, urethane resin, vinyl chloride resin, olefin resin, chlorinated polyolefin resin and / or the like.
Alternatively, a sheet having closed cells and having elasticity can be used. However, foamed polychloroprene having closed cells is preferred in consideration of the feeling of fit to the body, elasticity, light weight, and heat insulation and heat retaining effects when tailored into a wet suit. Further, for example, Japanese Patent Application Laid-Open No. H11-7
It may be formed by laminating foamed rubber materials having different hardness or expansion ratio as proposed and used in Japanese Patent Application No. 9078 (Applicant: Inapoli Trading Co., Ltd.).

The fabric in the present invention is a woven fabric, a knitted fabric or a non-woven fabric, but is preferably a stretchable woven fabric or a knitted fabric, and may be a two-way tricot (having both vertical and horizontal stretch properties) woven or knitted fabric. More preferred.
The material of the fiber constituting the fabric is not particularly limited, and polyester, polyurethane, acryl, polypropylene and the like can be used. In particular, for a wet suit application, a nylon jersey or a polyester jersey is most preferable.
The fabric of the present invention may be water-repellent with a water-repellent agent such as a silicone-based or fluorine-based fabric. In this case, either a fabric formed by using water-repellent fibers or a fabric that is water-repellent in a cloth state may be used.

The sponge fabric of the present invention is obtained by laminating the above-mentioned cloth on one or both sides of the above-mentioned sponge sheet. The combination and the bonding method are not limited. For example, in the case of wet suit use, a sponge fabric obtained by a manufacturing method in which an adhesive is applied to a polychloroprene-based sponge sheet, and then a nylon-based or polyester-based fabric is stacked and heated and pressed at 80 to 150 ° C. Used for

The polymer contained in the polychloroprene-based latex in the present invention is a homopolymer of 2-chloro-1,3-butadiene (hereinafter referred to as chloroprene) or one of monomers copolymerizable with chloroprene and chloroprene. It is a copolymer obtained by copolymerizing two or more types. Examples of monomers copolymerizable with chloroprene include, for example, 2,3.
-Dichloro-1,3-butadiene, 1-chloro-1,3
-Butadiene, butadiene, isoprene, styrene, acrylonitrile, acrylic acid and its esters, methacrylic acid and its esters, and the like, and if necessary, two or more kinds may be used.

In particular, if a copolymer of chloroprene and one or more carboxyl group-containing vinyl monomers is used, the flexibility of the adhesive layer can be maintained and a good touch can be obtained.
preferable. As the carboxyl group-containing vinyl monomer,
For example, methacrylic acid, acrylic acid, crotonic acid, fumaric acid, maleic acid, citraconic acid, glutaconic acid and the like can be mentioned. If necessary, two or more kinds of carboxyl group-containing vinyl monomers may be used. Among them, methacrylic acid (also referred to as 2-methylpropenoic acid or α-methylacrylic acid) is most preferable, and if it is a copolymer of chloroprene and methacrylic acid, viscosity control at the time of emulsion polymerization is easy and adhesion is also possible. The agent can have high water-resistant adhesive strength.

The amount of the carboxyl group-containing vinyl monomer charged is not particularly limited, but the carboxyl group-containing vinyl monomer is preferably 0.01 to 1 part by mass of the total 100 parts by mass of the monomer.
It is preferably 0 parts by mass. By copolymerizing a carboxyl group-containing vinyl monomer in an amount of 0.01 parts by mass or more,
The crystallinity of the polymer can be lowered, and as a result, the seam can be given flexibility. However, when the amount of the carboxyl group-containing vinyl monomer is more than 10 parts by mass, the pot life after adding the curing agent becomes short or the water resistance becomes low when used as a two-part adhesive. There is less preferred.

The emulsifier and / or dispersant used in the emulsion polymerization of the polychloroprene latex in the present invention is not particularly limited, and various anionic, nonionic and cationic types commonly used in chloroprene latex are used. it can. As an anionic emulsifier,
There are carboxylic acid type, sulfate type and the like, and examples thereof include alkali metal salts of rosin acid, alkyl sulfonates having 8 to 20 carbon atoms, alkyl aryl sulfates, and condensates of sodium naphthalene sulfonate and formaldehyde. Specific examples of the nonionic type include polyvinyl alcohol or a copolymer thereof (for example, a copolymer with acrylamide), polyvinyl ether or a copolymer thereof (for example, a copolymer with maleic acid), polyvinyl pyrrolidone or a copolymer thereof. Examples thereof include polymers (for example, copolymers with vinyl acetate), those obtained by chemically modifying these (co) polymers, and cellulose derivatives (hydroxyethyl cellulose).
Specific examples of the cationic type include an aliphatic amine salt and an aliphatic quaternary ammonium salt, and examples thereof include octadecyltrimethylammonium chloride, dodecyltrimethylammonium chloride, and dilauryldimethylammonium chloride.

Among them, polyvinyl alcohol is most desirable. When a latex containing polyvinyl alcohol is used, the tack holding time of the adhesive is long, and the allowable time from application to lamination can be lengthened. In this case, the degree of saponification and the degree of polymerization of polyvinyl alcohol are not particularly limited, but those having a saponification degree of 60 to 95 mol% and a degree of polymerization of 200 to 700 are preferable. Further, a modified type (for example, an acetoacetylated type, a type having a polyethylene unit (usually called an RS type)) may be used.

The amount of the emulsifier and / or dispersant added to the polychloroprene latex in the present invention is preferably 0.5 to 10 parts by mass based on 100 parts by mass of the initially charged monomers. If the amount is less than 0.5 part by mass, the emulsifying power is not sufficient, and if it exceeds 10 parts by mass, the water-resistant adhesive strength of the adhesive is reduced.

The method for polymerizing the chloroprene polymer to obtain the polychloroprene latex of the present invention is not particularly limited, and includes a polymerization temperature, a polymerization catalyst, a chain transfer agent, a polymerization terminator, a final polymerization rate, demonomerization, and concentration. By appropriately selecting and controlling the conditions and the like, it is possible to adjust the solid content concentration, the molecular weight of the toluene-soluble portion, the toluene-insoluble content (gel content), and the like.

[0015] The polymerization temperature of the chloroprene polymer in the present invention is not particularly limited, but the polymerization temperature is preferably 10 to 50 ° C in order to smoothly carry out the polymerization reaction. Polymerization catalysts include sulfates such as potassium persulfate,
Organic peroxides such as -butyl hydroperoxide and the like, and are not particularly limited.

The type of chain transfer agent used for the polymerization is not particularly limited, and those usually used for emulsion polymerization of chloroprene can be used. For example, long-chain alkyl such as n-dodecyl mercaptan or tert-dodecyl mercaptan can be used. Known chain transfer agents such as mercaptans, dialkylxanthogen disulfides such as diisopropylxanthogen disulfide and diethylxanthogen disulfide, and iodoform can be used.

The polychloroprene polymerization terminator (polymerization inhibitor) is not particularly limited, and for example, 2,6-tert-butyl-4-methylphenol, phenothiazine, hydroxyamine and the like can be used.

The final polymerization rate of polychloroprene is not particularly limited and can be arbitrarily adjusted. Unreacted monomers are removed by a demonomerization operation.
The method is not particularly limited. The polychloroprene-based latex of the present invention can be controlled to a required solid concentration by concentrating or diluting by adding water or the like. Examples of the method for concentration include concentration under reduced pressure, but are not particularly limited. Adhesive drying speed,
In consideration of the storage stability of the adhesive and the adhesive, the solid concentration of the polychloroprene-based latex is preferably 40 to 65% by mass.

The polychloroprene latex of the present invention has a copolymer having a toluene insoluble content (gel content) of 5%.
The content is preferably in the range of from 70% by mass to 70% by mass, and an adhesive having an excellent balance between the initial adhesive strength and the normal adhesive strength can be obtained. When the toluene insoluble content is lower than 5% by mass, the normal adhesive strength is insufficient, and when it exceeds 70% by mass, the initial adhesive force is insufficient.

The adhesive in the present invention can contain a tackifier resin in an amount of 0 to less than 20 parts by mass based on 100 parts by mass (in terms of solid content) of a polychloroprene-based latex. Is most preferred. When the adhesive is blended for the purpose of increasing the tack retention time and increasing the allowable time from application to lamination, the tackifier resin needs to be less than 20 parts by mass. The reason for this is that the tackifier resin is easily soluble in organic solvents such as toluene, and if added in an amount of 20 parts by mass or more, it may adversely affect the solvent resistance of the adhesive layer. Here, the tackifying resin specifically refers to a rosin resin, a polymerized rosin resin, an α-pinene resin, β
- pinene resins, terpene phenol resins, C ₅ fraction petroleum resin, C ₉ fraction petroleum resin, C ₅ / C ₉ fraction petroleum resin, DCPD-based petroleum resins, alkylphenol resins, xylene resins, coumarone resins, click Malon indene resin and the like.

When the tackifying resin is compounded, the compounding method is not particularly limited, but it is preferable to add the resin as an aqueous emulsion in order to uniformly disperse the resin in the adhesive. Further, in the method for producing an aqueous emulsion of a tackifying resin, a solution dissolved in an organic solvent such as toluene is emulsified / dispersed in water using an emulsifier.
There are a method of removing the organic solvent by heating while reducing the pressure, a method of pulverizing the organic solvent into fine particles and emulsification / dispersion, and the former capable of producing a fine particle emulsion is preferable.

The water-based adhesive of the present invention contains a polychloroprene-based latex and a tackifying resin as essential components. According to the required performance, a metal oxide, a thickener, a filler, a film-forming aid, an ultraviolet absorbing agent, etc. An agent, an antioxidant, a plasticizer, a vulcanizing agent, a vulcanization accelerator, an antifoaming agent and the like can be optionally added. To increase the storage stability of the adhesive, a metal oxide may be added, and specific examples include zinc oxide, magnesium oxide, and lead oxide. The metal oxide can suppress a decrease in pH due to a dehydrochlorination reaction of the polychloroprene copolymer. These metal oxides are preferably added in the form of an aqueous dispersion, but may be added in the form of a powder. Examples of an apparatus for producing an aqueous dispersion include a rotary homogenizer, a media mill, a colloid mill, and a high-pressure homogenizer, and are not particularly limited. Typical examples of the rotary homogenizer include a homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.) and Clearmix (manufactured by M Technique Co., Ltd.). Typical examples of the media mill include a Dynomill (manufactured by Shinmaru Enterprise). ). A typical example of a colloid mill is a mass colloider (manufactured by Masuko Sangyo Co., Ltd.). A typical example of a high-pressure homogenizer is Mic.
rofluidazer (manufactured by Microfluidics), Homogenizer (APV GAULIN)
Co., Ltd.), ULTIMAIZER System (manufactured by Sugino Machine Co., Ltd.), and DeBEE series (manufactured by Japan BEE Co., Ltd.).

When adjusting the viscosity of the adhesive, a thickener may be added. Specific examples of the thickener include sodium polyacrylate, water-soluble polyurethane, associative polyurethane emulsion, and alkali swelling type. Acrylic emulsion, carboxymethyl cellulose (CMC), methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HP
C), polyvinyl alcohol, synthetic smectite and the like. The amount of the thickener added is 0.01 to 1 based on 100 parts by mass of the polychloroprene latex in terms of solid content.
The amount is preferably 0 parts by mass, more preferably 0.02 to 5 parts by mass. Within this range, the viscosity of the adhesive can be adjusted to an appropriate range. In order to reduce product cost, it is effective to add a filler to the adhesive, and specific fillers include calcium carbonate, aluminum hydroxide, titanium oxide, barium sulfate, and synthetic silica. Can be As a film forming aid, propylene glycol, n-butyl ether, dipropylene glycol,
Tripropylene glycol, 2,2,4-trimethyl-
1,3-pentadiol monoisobutyrate, 2,2
4-trimethyl-1,3-pentadiol diisobutyrate and the like.

The water-based adhesive of the present invention may be used as a one-component adhesive or a two-component adhesive in combination with various curing agents. In this case, examples of the curing agent include a melamine resin, a blocked isocyanate compound, and a water-dispersed isocyanate compound. When a curing agent is used, a water-dispersed isocyanate compound which can be dispersed as fine particles in water when added and stirred in water is preferred because it is easy to handle.

The viscosity of the adhesive may be adjusted according to the specifications of the coating method and the coating apparatus.
0 [mPa · s] (B-type viscometer, 25 ° C, 30 rpm)
Is preferred. If the viscosity is less than 1000 [mPa · s],
Repelling on the surface of the application surface may be a problem, and if the viscosity is higher than 15000 [mPa · s], uniform application becomes difficult.

In the step of applying the adhesive to the sponge fabric in the bonding method of the present invention, the method of applying the adhesive and the specifications of the apparatus are not particularly limited. Spraying, curtain flow coater, bar coater, roll coater, etc. can be applied if a large number of sponge doughs are stacked to increase the application area. Further, the roll coater method includes a gravure roll coater method, a reverse gravure roll coater method and the like. However, when the application area is small, a large-sized device cannot be used, and application with a brush, a brush, or a finger is preferable. Although the amount of application is not particularly limited, it is necessary to control the adhesive so that the adhesive does not protrude from the seam portion, and preferably ^{20 to} 200 g / m ² (wet).

In the pressure bonding step of the bonding method of the present invention, the method and the specifications of the apparatus are not particularly limited. However, the most preferable method is to butt-bond after the adhesive is applied and then after the adhesive is dried. The state in which the adhesive is dried is a state in which the moisture in the adhesive layer has evaporated by 50% or more, that is, when the moisture in the adhesive before application is 100% by mass, this is preferably less than 50% by mass, and further, It preferably refers to a state of less than 20% by mass, and after the state in which a coating is formed on the surface of the adhesive layer, the butted surfaces of the sponge dough are overlapped with each other. The reason why the method of bonding after drying is suitable is that if the adhesive is butt-bonded in a wet state, the adhesive may protrude, which may impair the appearance of the product. In addition, when the sponge sheet of the cloth has closed cells, moisture in the adhesive is less likely to evaporate. The crimping method is preferably a manual operation. This is to prevent the cut surfaces from being shifted and adhered to each other. In the bonding method of the present invention, sufficient adhesive strength and water tightness can be obtained. However, in order to further enhance or reinforce water tightness, Japanese Patent Application Laid-Open No. Hei 7-331521 (Applicants: Masahiro Nagasako, Hideo Shiozawa) As proposed in Japanese Patent Application Laid-Open No. 11-61634 (applicant: Bando Chemical Co., Ltd.), sewing is performed along a seam portion, a sealing agent is applied to the seam portion, and an elastic tape is applied from above. It is also possible to adhere.

[0028]

EXAMPLES The present invention will be described below with reference to examples, but these examples do not limit the present invention. In addition,
In the following description, parts and% are expressed on a mass basis unless otherwise specified.

[Experimental Example 1] A saponification degree of 88 was added to 96 parts by mass of water in a nitrogen atmosphere using a reactor having an internal volume of 3 liters.
3.5 parts by mass of polyvinyl alcohol (Denkapovar B-05 / manufactured by Denki Kagaku Kogyo Co., Ltd.) having a mole percentage of 550 and a polymerization degree of 550 were dissolved at 60 ° C. After cooling the aqueous polyvinyl alcohol solution to near room temperature, 99 parts by mass of a chloroprene monomer, 1 part by mass of methacrylic acid, and 0.4 part by mass of octyl mercaptan were added thereto. While maintaining this at 45 ° C., polymerization was carried out using sodium sulfite and potassium persulfate as initiators to obtain a polychloroprene latex.
Next, a 20% by mass aqueous solution of diethanolamine was added to the polychloroprene latex to adjust the pH to 7, and
The mixture was concentrated by heating under reduced pressure to prepare a solid content of 55% by mass. When the solid content of this polychloroprene-based latex and the gel content of the copolymer were measured by the following methods, the solid content was 55% by mass and the gel content was 29% by mass.

[Solid Content Concentration] Only the aluminum dish was weighed and designated as A. An aluminum dish containing 2 ml of the latex sample was weighed and designated B. 110 ° C aluminum plate with latex sample
After drying in an atmosphere for 2 hours, the sample was weighed and designated C. The solid concentration (%) was determined by the following equation. Solid content concentration = {(CA) / (BA)} × 100 [Measurement of gel content (toluene-insoluble matter)] A latex sample was freeze-dried and weighed to obtain A. After dissolving with toluene (adjusted to 0.6%) at 23 ° C. for 20 hours, the gel was separated using a centrifuge and further using a 200-mesh wire net. The gel was air-dried and then dried for 1 hour in a 110 ° C. atmosphere. The gel content (%) was calculated according to the following equation. Gel content = (B / A) × 100

Example 1 The polychloroprene latex obtained in Experimental Example 1 was added to a solid content of 100 parts by mass.
5 parts by mass (in terms of solid content) of a 50% aqueous dispersion of zinc oxide (AZ-SW / Osaki Kogyo Co., Ltd.), a water-soluble polyurethane-based thickener (Primal RM-8W / Rohm and Haas Japan Co., Ltd.) 0.06 parts by mass (manufactured by the company) (in terms of solid content) was blended to prepare a one-component aqueous adhesive.
This one-component adhesive was designated as adhesive A.

Two pieces of sponge dough (thickness: 3 mm thick polychloroprene foam sheet with nylon jersey stretched on the front and back) cut into a rectangular shape having a width of 50 mm and a length of 100 mm were prepared, and each sponge dough was prepared. About 0.03 g of the adhesive A was applied to a cut surface having a length of 100 mm with a finger. After drying in an atmosphere at 23 ° C. for 5 minutes, the cut surfaces to which the adhesive A was applied were abutted to each other and bonded manually.
This bonding method is referred to as bonding method A.

The test pieces obtained by the bonding method A were subjected to the following adhesive strength evaluation tests. [Initial Adhesive Strength Evaluation Test] Ten minutes after pressing, the joint was pulled in a vertical direction at a joint speed of 200 mm / min by a tensile tester to measure the adhesive strength. [Normal Adhesion Strength Evaluation Test] Seven days after the pressure bonding, the joint was pulled in a vertical direction at a joint speed of 200 mm / min with a tensile tester to measure the adhesive strength. [Water-resistant adhesive strength evaluation test] One day after pressure bonding, immersed in pure water, immersed for 7 days, and then pulled at a tensile speed of 200 m with a tensile tester.
It was pulled in the vertical direction of the joint at m / min, and the adhesive strength was measured. [Solvent Resistance Adhesion Evaluation Test] One day after pressing, dipped in toluene for 2 seconds, and in a tensile test, the tensile speed was 200 m.
It was pulled in the vertical direction of the joint at m / min, and the adhesive strength was measured. [Evaluation test of solvent-resistant adhesive strength] Seven days after the pressure bonding, immersion in toluene for 2 seconds, and a tensile speed of 200 m in a tensile test
It was pulled in the vertical direction of the joint at m / min, and the adhesive strength was measured.

Example 2 The same sponge fabric (thickness: 3 mm thick polychloroprene foam sheet with nylon jersey stretched on the front and back) cut into a rectangular shape having a width of 50 mm and a length of 100 mm. Prepare two pieces, and cut each sponge cloth into a cut surface with a length of 100 mm,
About 0.03 g of the same adhesive A as in Example 1 was applied with a finger. After drying in an atmosphere at 23 ° C. for 2 hours, the cut surfaces to which the adhesive A was applied were abutted to each other and bonded by contact pressure. This bonding method is referred to as bonding method B. The test piece obtained by the bonding method B was subjected to the same adhesive strength evaluation test as in Example 1.

Example 3 The same sponge fabric (thickness: 3 mm, polychloroprene foam sheet with nylon jersey on both sides) cut into a rectangular shape having a width of 50 mm and a length of 100 mm. Prepare two pieces, and cut each sponge cloth into a cut surface with a length of 100 mm,
About 0.03 g of the same adhesive A as in Example 1 was applied with a finger. After drying in a 70 ° C. atmosphere for 2 minutes, the cut surfaces to which the adhesive A was applied were abutted to each other and bonded by contact pressure. This bonding method is referred to as bonding method C. The test piece obtained by the bonding method C was subjected to the same adhesive strength evaluation test as in Example 1.

Example 4 The polychloroprene latex obtained in Experimental Example 1 was added to 100 parts by mass of a solid content.
Terpene phenolic tackifying resin (Tamanol E-10)
0 / Arakawa Chemical Industry Co., Ltd.), 15 parts by mass (solid content conversion), 50% zinc oxide aqueous dispersion (AZ-SW / Osaki Industry Co., Ltd.) 5 parts by mass (solid content conversion), water solubility 0.1 part by mass (solid content conversion) of a polyurethane thickener (Primal RM-8W / manufactured by Rohm and Haas Japan KK) was blended to prepare a one-part water-based adhesive. This one-component aqueous adhesive is referred to as adhesive B. Adhesive B
, A test piece was prepared by the same bonding method A as in Example 1, and the same adhesive strength evaluation test as in Example 1 was performed.

Example 5 Using the adhesive B, a test piece was prepared by the same bonding method B as in Example 2, and the same adhesive strength evaluation test as in Example 1 was performed.

Example 6 Using an adhesive B, a test piece was prepared by the same bonding method C as in Example 3, and the same adhesive strength evaluation test as in Example 1 was performed.

Example 7 The polychloroprene latex obtained in Experimental Example 1 was added to 100 parts by mass of a solid content.
Terpene phenolic tackifying resin (Tamanol E-10)
0 / Arakawa Chemical Industry Co., Ltd.), 15 parts by mass (solid content conversion), 50% zinc oxide aqueous dispersion (AZ-SW / Osaki Industry Co., Ltd.) 5 parts by mass (solid content conversion), water solubility A polyurethane-based thickener (Primal RM-8W / manufactured by Rohm and Haas Japan KK) was compounded in an amount of 0.1 part by mass (in terms of solid content) to obtain a main agent. As the curing agent, a water-dispersible isocyanate compound having an isocyanate group content of 18.6% by mass (Takenate WD-730 / manufactured by Takeda Pharmaceutical Co., Ltd.) alone is used, and polychloroprene latex as a main component is added to 100 parts by mass as a solid content. On the other hand, the water-dispersed isocyanate compound was used by mixing with the main agent so as to be 5 parts by mass. This two-part water-based adhesive is referred to as an adhesive C.
Using Adhesive C, a test piece was prepared by the same bonding method A as in Example 1, and the same adhesive strength evaluation test as in Example 1 was performed.

Example 8 Using the adhesive C, a test piece was prepared by the same bonding method B as in Example 2, and the same adhesive strength evaluation test as in Example 1 was performed.

Example 9 Using an adhesive C, a test piece was prepared by the same bonding method C as in Example 3, and the same adhesive strength evaluation test as in Example 1 was performed.

Comparative Example 1 The polychloroprene latex obtained in Experimental Example 1 was added to 100 parts by mass of a solid content.
45 parts by mass (solid content) of a 53% aqueous emulsion of terpene phenol resin (Tamanol E-100 / Arakawa Chemical Industries, Ltd.) and a 50% aqueous dispersion of zinc oxide (AZ)
-SW / manufactured by Osaki Kogyo Co., Ltd.) in an amount of 5 parts by mass (in terms of solid content), a water-soluble polyurethane thickener (Primal®)
M-8W / Rohm & Haas Japan K.K.) was added in an amount of 0.2 part by mass (in terms of solid content) to prepare a one-component aqueous adhesive. This one-component aqueous adhesive is referred to as an adhesive D. Using Adhesive D, a test piece was prepared by the same bonding method A as in Example 1, and the same adhesive strength evaluation test as in Example 1 was performed.

Comparative Example 2 Using the adhesive D, a test piece was prepared by the same bonding method B as in Example 2, and the same adhesive strength evaluation test as in Example 1 was performed.

Comparative Example 3 Using the adhesive D, a test piece was prepared by the same bonding method C as in Example 3, and the same adhesive strength evaluation test as in Example 1 was performed.

[Comparative Example 4] The polychloroprene latex obtained in Experimental Example 1 was added to 100 parts by mass of a solid content.
45 parts by mass (solid content) of a 53% aqueous emulsion of terpene phenol resin (Tamanol E-100 / Arakawa Chemical Industries, Ltd.) and a 50% aqueous dispersion of zinc oxide (AZ)
-SW / manufactured by Osaki Kogyo Co., Ltd.) in an amount of 5 parts by mass (in terms of solid content), a water-soluble polyurethane thickener (Primal®)
M-8W / Rohm & Haas Japan K.K.) was added in an amount of 0.2 part by mass (in terms of solid content) to obtain a main ingredient. The curing agent is a water-dispersed isocyanate compound having an isocyanate group content of 18.6% by mass (takenate WD-
730 / manufactured by Takeda Pharmaceutical Co., Ltd.) alone and mixed with the main component such that the water-dispersible isocyanate compound was 5 parts by mass with respect to 100 parts by mass of the solid component polychloroprene latex. This two-part aqueous adhesive is referred to as an adhesive E. A test piece was prepared using the adhesive E by the same bonding method A as in Example 1, and the same adhesive strength evaluation test as in Example 1 was performed.

Comparative Example 5 Using the adhesive E, a test piece was prepared by the same bonding method B as in Example 2, and the same adhesive strength evaluation test as in Example 1 was performed.

Comparative Example 6 Using the adhesive E, a test piece was prepared by the same bonding method C as in Example 3, and the same adhesive strength evaluation test as in Example 1 was performed.

Comparative Example 7 Denkachloroprene A-90
(Polychloroprene rubber, manufactured by Denki Kagaku Kogyo Co., Ltd.) 1
With a composition ratio of 00 parts by weight, 460 parts by weight of toluene, 115 parts by weight of methyl ethyl ketone, 90 parts by weight of methyl methacrylate, and 0.5 part by weight of benzoyl peroxide, a graft reaction of methyl methacrylate was performed to prepare a CR solvent-based adhesive. . 2,6-t-butyl-4-methylphenol was used as a polymerization terminator, and the conversion of methyl methacrylate was controlled to about 30% by weight. This solvent-based adhesive is referred to as an adhesive F. A test piece was prepared from the adhesive F by the same bonding method A as in Example 1, and the same adhesive strength evaluation test as in Example 1 was performed.

Comparative Example 8 A test piece was prepared from the adhesive F by the same bonding method B as in Example 2, and the same adhesive strength evaluation test as in Example 1 was performed.

[Comparative Example 9] A test piece was prepared from the adhesive F by the same bonding method C as in Example 3, and the same adhesive strength evaluation test as in Example 1 was performed.

The evaluation results obtained in Examples 1 to 9 and Comparative Examples 1 to 9 are shown in Table 1.

[0052]

[Table 1]

[0053]

[Table 2]

[0054]

[Table 3]

[0055]

[Table 4]

1) Tamanol E-100 (manufactured by Arakawa Chemical Industries, Ltd.), an aqueous dispersion of a terpene phenol resin, solid content: 53%. 2) AZ-SW (manufactured by Osaki Industry Co., Ltd.), aqueous dispersion of zinc oxide, solid content 50%. 3) Primal RM-8W (manufactured by Rohm and Haas Japan KK), water-soluble polyurethane thickener, solid content 17% 4) Takenate WD-730 (manufactured by Takeda Pharmaceutical Co., Ltd.), water-dispersed isocyanate Compound, solid content 100%

[0057]

As is clear from Table 1, the bonding method of the present invention (Examples 1 to 9) is the same as the conventional bonding method (Comparative Examples 1 to 9).
9) Higher adhesive strength.

Continued on front page F term (reference) 3B154 AB18 BA48 BB63 BD14 BE06 BE08 BF12 4F071 AA12X AA32X AA53 AE22 AH19 CA03 CA05 CB03 CC06 CD05 4J040 CA141 DD022 KA26 MB02

Claims (9)

[Claims] 1. A method for adhering cut surfaces of a sponge fabric in which a sponge sheet and a fabric are laminated, wherein a polychloroprene latex is added to the cut surface in terms of solid content.
A method for bonding sponge fabric joints, comprising applying and bonding an adhesive obtained by mixing 0 to 20 parts by mass of a tackifier resin to 00 parts by mass. 2. An adhesive comprising a two-component adhesive obtained by combining a hardening agent with a main agent obtained by mixing a tackifying resin in an amount of 0 to less than 20 parts by mass with respect to 100 parts by mass of a polychloroprene-based latex in terms of solid content. 2. The bonding method according to claim 1, wherein the bonding method is an agent. 3. The method according to claim 1, wherein the adhesive or the two-component adhesive comprises 0.01 to 10 parts by mass of a thickening agent based on 100 parts by mass of the polychloroprene latex in terms of solids. Item 3. The bonding method according to Item 1 or 2. 4. The method of bonding sponge fabrics according to claim 1, wherein the adhesive is applied and then dried and bonded. 5. The polychloroprene-based latex is a latex obtained by copolymerizing chloroprene and a carboxyl group-containing vinyl monomer.
5. The bonding method according to any one of 4. 6. The polychloroprene-based latex contains polyvinyl alcohol.
The bonding method according to any one of claims 1 to 5, wherein 7. The bonding method according to claim 1, wherein the polychloroprene-based latex is a latex polymerized in the presence of polyvinyl alcohol. 8. A polychloroprene-based latex is obtained by copolymerizing a monomer mixture containing 0.01 to 10 parts by mass of a carboxyl group-containing vinyl monomer in a total of 100 parts by mass of monomers. The bonding method according to claim 1, wherein the adhesive is latex. 9. An adhesive structure bonded by the method according to claim 1. Description: