JPS58171463A - Bonding method - Google Patents

Abstract

PURPOSE:To increase the wettability of the articles to be bonded, and to bond the articles firmly with each other, by interposing a self-supporting polymer film containing a polymerization initiator and a liquid composition which dissolves and tackifies the film, e.g. a vinyl monomer, between the articles, and polymerizing the monomer with heat. CONSTITUTION:(A) A self-suporting polymer film (preferably a polyester resin, chlorosulfonated polyethylene resin film, etc. having a thickness of 5-200mu) and (B) a liquid composition composed mainly of (i) a vinyl monomer which dissolves or dilates at least the surface layer of said film (e.g. methyl methacrylate) and/ or its oligomer (e.g. polyester monomethacrylate) are interposed between articles to be bonded with each other, and the liquid composition is polymerized with heat to effect the bonding of the articles. The film or the liquid contains a polymerization initiator such as ketone peroxide in an amount of preferably 0.1-5wt%. The amount of the liquid composition is 10-300g per 1m<2> of the polymer film having a thickness of 100mu when the viscosity of the liquid is <=50 poise.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of bonding two or more articles of the same or dissimilar materials.

Many methods are known for bonding two or more articles together. Typical examples include a method using an adhesive tape with pressure-sensitive adhesive properties on both sides, a method using an organic solvent adhesive side, a method using an adhesive activated by water, a solvent, or heat, and a method using an adhesive that is activated by water, solvent, or heat. I) Methods using adhesives that harden, methods using adhesives that harden due to moisture absorption, etc. are known.

However, the method using adhesive tape has the disadvantage that when various types of stress are continuously applied to the adhesive layer, flow occurs inside the adhesive layer and the adhesive tape peels off from the surface of the article. Methods using solvents have safety issues such as environmental pollution due to solvent vaporization, fire, and health problems.
] When using an activated adhesive, it is necessary to completely volatilize water in order to obtain sufficient adhesive strength, and even after solidification, it absorbs moisture and the adhesive strength is significantly reduced. There is a problem with adhesives that are activated by solvents. 1! There is a problem similar to that when using an Ifs agent-based adhesive. When using an adhesive that is activated by heating or an adhesive that cures by heating, a large amount of heat storage is required, and a large amount of heat is required. There is a problem that the adhesive strength decreases significantly when exposed to high temperatures.

Adhesives of the type that harden due to moisture absorption do not pose much of a problem during the adhesion process and after adhesion, but they have the disadvantage that storage of the adhesive is complicated and the adhesive is relatively expensive.

The present invention exhibits sufficient wettability even on rough surfaces without using heating means that require a large amount of heat storage, such as heat curing type, and is strong after polymerization. To provide a new bonding method for bonding articles together without volatilization of harmful substances during bonding work.

To explain the details of the present invention in detail, when bonding two or more articles, a self-supporting polymer film and a vinyl monomer that melts or swells at least the surface layer of the film to become adhesive. using a liquid material containing polymers and/or oligomers as main components, containing a polymerization initiator in either the film or the liquid material, and providing the primary liquid material and the film between the opposing inner surfaces of the article. The object of the present invention is to provide an adhesion method characterized in that two or more articles are bonded together by heating the liquid substance in a heated state to polymerize the liquid substance.

One embodiment of the present invention includes a polymer film having self-supporting properties, and a liquid material mainly composed of a vinyl single body and/or oligomer that dissolves or swells at least the surface layer of the film to make it sticky. A polymerization initiator is contained in either the film or the liquid substance, and the liquid substance, the film, and the liquid substance are present between two or more articles for the purpose of adhesion in the order of the liquid substance, the film, and the liquid substance. The liquid substance is heated in a heated state to polymerize the liquid substance, thereby adhering the articles together. According to this method, at least the surface layer portion of the polymer film is dissolved or swollen with the liquid material and has adhesive properties, and since the liquid material is polymerized by heating, the interface portion with the article has: A microscopically non-uniform sea-island structure consisting of a part of a polymer made of a polymer film and a vulcanized rubber-like or resin-like polymer made of a polymer of a liquid substance is formed into a shape and is firmly attached to the surface of the article. It shows the adhesion state, 2
One or more articles can be firmly adhered to each other.

Therefore, the primary polymer film and the liquid substance to be present between the articles can be either coated on both sides of the film and interposed between the articles, or coated with the liquid substance on the inner surface of the article in advance and interposed with the film. It will be appreciated that the articles may be stacked. In addition, if the polymer film is made of a material or has a thickness that allows it to be almost completely dissolved or swollen in relation to a liquid substance and penetrate to the back side, the liquid substance is not present on both sides of the film, and only one side can be Even if it is present only on the side, the film will substantially support the liquid, so
It will also be understood that the adhesive strength targeted by the present invention can be obtained.

Articles that can be bonded by the bonding method of the present invention are those that have been deformed or changed in quality by the heating operation used to polymerize the liquid material (1), unless the characteristics of the article are impaired. The subject matter is not limited, and for example, plastics, rubbers, metals, stones, glasses, and processed products made from these materials can be used as side threads.

The essential materials used in carrying out the present invention are a polymer film (or sheet) whose main component is a vinyl monomer and/or oligomer that can be made sticky by dissolving or swelling at least the surface layer of the film. Of course, these materials are selected depending on the article to be bonded, and the combination of the three materials is the most effective. Combinations that exhibit remarkable effects are selected.

Vinyl monomers and/or oligomers used in the practice of the present invention may be monofunctional or polyfunctional as long as they are supported by active radicals generated by decomposition of a polymerization initiator. A specific example of what can be used is the following 6).

Monofunctional vinyl monophthalmos: e.g. methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, cyclohexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, ) acrylate.

Alkyl or cycloalkyl acrylate or methacrylate such as decyl (meth)acrylate, lauryl (meth)acrylate, vinyl acetate, vinyl propionate, (meth)acrylonitrile, styrene, vinyltoluene, (meth)acrylic acid, 2-hydroxyethyl (meth)acrylate or 2-hydroxypropyl (meth)
Hydroxy esters of (meth)acrylic acid, such as acrylates.

Polyfunctional vinyl monomers such as glycidyl (meth)acrylate and diethylaminoethyl (meth)acrylate: e.g. ethylene glycol di(
meth)acrylate, diethylene glycol di(meth)
-Functional oligomers such as acrylate, triethylene glycol di(meth)acrylate, ethylene glycol or propylene glycol diester of (meth)acrylic acid, trimethylolpropane tri(meth)acrylate, tetramethylolpropane tetra(meth)acrylate, etc. m: For example, polyester mono(meth)acrylate obtained by the reaction of polyester resin and (meth)acrylic acid, etc., polyfunctional oligomer m: For example, polyethylene glycol di(meth)acrylate, epoxy resin and (meth)acrylic acid Epoxy (meth)agelylate obtained by the reaction of, urethane (meth)acrylate obtained by the reaction of a polyisocyanate compound and hydroxyalkyl (meth)acrylate,
Liquid materials containing vinyl monomers and/or oligomers as main components, such as polyether di(meth)acrylate or polyester di(meth)acrylate obtained by the reaction of polyester resin and (meth)acrylic acid, are It is composed of one or more types of oligomers and/or oligomers, and its viscosity is 0.0000000000000000000000000000000000000000000000000000000000000000.0 The liquid substance is preferably adjusted to a range of O1 to 100 poise, practically 50 poise or less. /
rd-preferably lO~300P/y! It is applied within the range of

After being activated by being dissolved or swollen in a liquid substance whose main component is polymer, after one polymerization, microscopic Rubbers such as natural rubber, isoprene rubber, chloroprene rubber, nitrile rubber, phthadiene-styrene copolymer rubber, acrylic rubber, and/or polyester resin, glolsulfonated polyethylene resin , a film (or sheet) with a thickness of 5 to 200 fi made of synthetic resins such as polybutyral resin, polyacrylic resin, polyether resin, polyamide resin, polyurethane resin, and the above-mentioned rubbers and/or synthetic resins. Examples of processed products include foamed films, synthetic papers, non-woven fabrics, border fabrics, etc., but those selected from the group of polyester resins, chlorosulfonated polyethylene, and polyacrylic resins are particularly preferred. be.

The polymerization initiator blended into either the liquid material or the polymer film decomposes when heated, generates active radicals, and polymerizes the liquid material, which becomes ketone peroxide when it collapses. .

Peroxy ketal, hydrobar oxide, dialkyl peroxide, diasilver oxide F, peroxy ester, peroxy carbonate, benzoyl peroxide, cumenehide.

organic peroxides such as loba oxide, methyl ethyl ketone peroxide, 2,2-azobisisobutyronitrile, 2',2'-azobis-(4-methoxy-2,
Examples include azo compounds such as 4-dimethylparellonitrile, 1-1'-azobis(cyclohexane-1-carbonitrile), and the like. Before starting the polymerization, either the liquid material or the polymer film was coated with 0. It is blended in a range of 1 to 10%, preferably 0 to 5%.

However, in order to improve the storage stability of the system containing a polymerization initiator, hydroquinone, hydroquinone monomethyl ether, methylhyde [1 quinone, p-benzoquinone, catechol, phenoazine picrate, A
- Polymerization inhibitors such as butylcatechol, 2-butyl-4-hydroxyanisole, and 2,6-di-tert-butyl-p-cresol can be blended at a concentration of 1/l O or less of the polymerization initiator. can. In order to promote polymerization by heating, an appropriate amount of a polymerization promoter such as dimethylaniline or a condensate of n-butyraldehyde and aniline may be added.

Therefore, in the bonding method of the present invention, when bonding two or more articles by combining the polymer film, the liquid, and a polymerization initiator blended with each of these,
A liquid substance is present on one or both sides of the polymer film to dissolve the entire film, or
! I] by dissolving or swelling the part and making it sticky;
It is characterized in that it is brought into uniform contact with the surface of the article, and then heated at 30 to 150° C. for 5 seconds to 48 hours to polymerize and bond the liquid material.

Therefore, according to the method of the present invention, the liquid material and the dissolved or swollen polymer film can be used to increase the wettability of the article during bonding, thereby increasing the final bonding area. Since the liquid material polymerizes in a short time, strong adhesive strength can be obtained, and after adhesion, the adhesive strength does not deteriorate even under high temperature and high humidity conditions.

Examples of the present invention will be shown below. The text middle part means the weight part. Note that when measuring the shear adhesive strength in Examples, if the strength of the sample body was weaker than the adhesive strength, the sample body was reinforced with a reinforcing material and the adhesive strength of the adhesive interface was measured.

Example 1 50 parts of styrene and 50 parts of ethylagelylate were polymerized in a 15% solution of toluene, coated on a release liner to a dry thickness of 10 mm, and heated at 130°C for 10 mm.
Dry for minutes to obtain a polymer film.

On the other hand, 60 parts of ethyl acrylate, 15 parts of 2-hydroxyethyl methacrylate, polyester polymethacrylate (a reaction product consisting of 152 parts of tetrahydrophthalic anhydride, 212 parts of diethylene glycol, and 172 parts of meF-acrylic acid), 1.2 voids (at 25°C) )) and 1.5 parts of 2.2'-azobisisobroni).

Next, the film (sample shape 20uX20II)
Approximately 5 tons of the above liquid material is applied to both sides, and one end of a 2.01 thick AB8 resin sheet (width 20 mm, length 100 m) is applied to one surface, and a 100 μ thick aluminum sheet (100 μm thick) is applied to the other surface. One end of the sample (Ii20iu, length 10011) was laminated at different levels (I) and heated at 100° C. for 1 hour to prepare a sample body.

This sample was tested in a universal tensile tester (tensile speed 5jll/mi).
The shear adhesive strength was measured at 18.6K
A value of P/- was obtained.

Examples 2 to 5 Using the polymer films and liquid materials shown in Table 1, adhered articles were adhered to each other under the polymerization and heating conditions shown in Table 1.

Table 1 As is clear from the above examples, the adhesive method of the present invention is as follows:
It is suitable for adhering articles of the same or different types and has strong adhesive strength.

patent applicant Nitto Electric Industry Co., Ltd. Representative Sanbe Hijikata

Claims (1)

[Claims] When bonding two or more articles, the main components are a self-supporting polymer film and a vinyl monomer and/or oligomer that dissolves or swells at least the surface layer of the film to make it sticky. Using a liquid material, either the film or the liquid material contains a polymerization initiator, and the liquid material is polymerized by heating with the liquid material and the film present between the opposing inner surfaces of the article. let me,
A bonding method characterized by bonding two or more articles.