JPH07138536A - Bonding method and adhesive - Google Patents

Abstract

PURPOSE:To greatly improve bonding speed at a good workability in a bonding step by applying the first adhesive component to an adherend and then bonding using a paper, etc., impregnated with the second adhesive component. CONSTITUTION:Bonding is conducted by applying the first adhesive component (e.g. a moisture-curable urethane or silicone resin adhesive) to an adherend and then using a paper, a cloth or net, or a thread or string impregnated with the second adhesive component (e.g. water or water contg. a cure accelerator of the first component). An example of the first component is an isocyanate prepolymer; that of the second component, water or an urethane adhesive mainly comprising a polyol. A cure accelerators may be added to the first and/or the second component (e.g. a tin or zinc salt for an urethane resin adhesive and a Lewis acid for an epoxy resin adhesive).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bonding method and an adhesive, and an object of the invention is to provide a bonding method and an adhesive exhibiting excellent bonding performance by fixing in a short time. .

[0002]

2. Description of the Related Art Conventionally, as a bonding method, (1) a method using a solvent type one-component adhesive, for example, a method using a rubber type solvent type adhesive or a vinyl acetate resin type solvent type adhesive.
(2) A method using a moisture-curable adhesive, for example, a method using a moisture-curable urethane resin adhesive or a moisture-curable silicone resin adhesive. (3) A method using a solvent-type two-component adhesive, for example, an epoxy resin-based adhesive or a urethane resin-based adhesive. (4) A method using an emulsion or latex adhesive, for example, a method using a vinyl acetate resin emulsion adhesive or a rubber latex adhesive.
(5) A method using a natural product adhesive such as starch or protein.
(6) A method using a hot melt adhesive. (7) There is a method using an instant adhesive, for example, a method using a cyanoacrylate adhesive.

In the bonding by the method (1), the bonding speed is high, but the heat resistance, solvent resistance and creep resistance are not sufficient. In the bonding by the method (2), if the adherend does not have sufficient moisture necessary for curing, the curing is delayed, and long-time compression is required until sufficient bonding is obtained. In the method (3), the problem of the pot life after mixing the main agent and the curing agent, that is, the pot life for increasing the curability is shortened, and it becomes difficult to use.
In the methods (4) and (5), it takes a long time to dry, so that it is difficult to perform the bonding by compression for a short time. According to the method of (6), it is possible to carry out bonding by compression for a short time, but the heat resistance of the bonding layer is not sufficient and it is expensive.

A two-liquid separation coating system (honeymoon type adhesive) in which a main agent (first component) and a curing agent (second component) are applied to each one of the adhesive surfaces in order to achieve quick adhesion is also used. In this case, in order to perform sufficient mixing in the adhesive layer,
The viscosity of the base compound and the curing agent is an important factor. When the viscosity is low, when it is used for a substance having permeability, the component permeates before the adhesive surfaces are overlapped with each other and the main agent and the curing agent are not mixed well, so that strong adhesion cannot be obtained. Also,
The work is complicated because the main agent and the curing agent must be separately applied on site.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an adhesive method and an adhesive exhibiting excellent adhesive properties, which have both good workability and improvement of the adhesive rate, which were difficult to achieve at the same time. It is what

[0006]

According to the present invention, a first component of an adhesive is applied to an adhesive surface, and the second component of the adhesive is impregnated through a paper / cloth or a net or thread / string. The present invention relates to a bonding method characterized by bonding and a two-component adhesive used for the same.

The adhesive used in the present invention includes:
(1) Isocyanate prepolymer as the first component, urethane resin-based adhesive containing the second component as water or polyol as the main component, (2) silicone resin as the first component, water as the second component, aminoxysiloxane, etc. Silicone resin adhesive as the silicone resin curing agent of (3), the first component is an epoxy resin, the second component is an epoxy resin adhesive containing amines, polyamides, polythiols, etc. as main components, (4) First Amino resin adhesive as a component, amino resin adhesive as a second component, or an ammonium resin or the like as a curing agent that reacts with free formaldehyde in the resin to form an acid, and (5) first component is an aqueous resorcinol resin solution, Resorcinol-based resin adhesive containing the second component as an aqueous solution containing formaldehyde, (6) Emulsifying the first component with PVA, or PV
MD the second component such as vinyl acetate resin emulsion containing A, EVA emulsion, or various latexes.
An aqueous vinyl-urethane resin-based adhesive containing an isocyanate monomer such as I or TDI or a prepolymer thereof, (7) a vinyl-modified urethane resin emulsion as the first component, and a water-dispersible aziridine as the second component An aqueous adhesive, (8) a modified vinyl emulsion as the first component, and an aqueous adhesive in which the second component is an amine pendant polymer can be used.

Further, in order to accelerate the reaction, it is possible to add a curing accelerator of each system to the first component and / or the second component, and in this case, the adhesion speed can be made extremely high. . As the curing accelerator used here, in the case of urethane-based resin adhesive, metal salts such as tin and zinc,
In the case of epoxy resin adhesives such as amines such as tertiary amines, there are tertiary amines, metal salts such as tin and zinc, Lewis acids and the like, and in the case of resorcinol resin adhesives there are alkalis etc. .

The ratio of the coating amount of the first component to the amount of the second component per unit area of the adhesive surface is generally within the allowable mixing range of each adhesive system. Of course, it is also possible to apply the first component to the adherend and to impregnate the second component into the paper / cloth / mesh material for the purpose of streamlining the work, not to accelerate the adhesion speed. Is.

It is also possible to reverse the above-mentioned first component and second component, apply the second component to the adherend, and impregnate the first component into paper, cloth or the like for use. . As the paper / cloth or thread / string-like or net-like substance, a paper / cloth-like substance which easily impregnates and holds the second component excellent in water absorption or oil absorption and a net-like substance which easily holds the second component are suitable, Paper such as filter paper, Japanese paper, kraft paper, non-woven fabric, cotton cloth, blanket, linen cloth, polyester cloth, nylon cloth, rayon cloth, etc., mesh made of fibers such as spinner, glass fiber, metal fiber, etc. A net or the like made of inorganic fibers can be used, and a simple thread or string can also be used. It goes without saying that the bonding operation by the method of the present invention can be carried out by cold compression or heat compression.

[0011]

EXAMPLES Examples will be described below. «Example 1» A 12 mm thick 5 ply lawan plywood and a high-pressure melamine decorative board (Sumitomo Bakelite 1.6 mm thick “decola”) were adhered to the plywood side with a moisture-curing urethane resin adhesive (Sumitomo Bakelite Sumitac GA-82
5g of 150g / m ² and 100gr / m ^{2 of the} same adhesive on the melamine decorative board side, and a cotton cloth (90g / m ² cloth impregnated with 140g / m ² water) impregnated with water is applied. Via a compression pressure of 7 kg / m ² . The ambient temperature is
It was 22 ° C. In addition, a tertiary amine (Pharmine DM-20 manufactured by Kao) is used as a curing accelerator in the water used to impregnate the cotton cloth.
Was also carried out when 5 g was dissolved per 100 g of water. Table 1 shows the rising speed of the adhesive strength when the cotton cloth impregnated with water was not used.

[0012]

[Table 1]

Example 2 Polyester F having a thickness of 3 mm
RP plate and 1.5 mm aluminum plate (JIS H400
0. A-1050P) per To adhere the base compound and 100 gr / m ^2, the same adhesive base material to the aluminum plate side 100 gr / m ² coating of epoxy resin adhesive (manufactured by Sumitomo Bakelite EA-110-12) on FRP side did. Next, 5 g of polyester non-woven fabric (25 g / m ² ) impregnated with 200 g / m ² of the adhesive curing agent and 5 g of tertiary amine (Henkel Hakusui EH-30) as a curing accelerator were added to 100 g of the curing agent. Each of them was bonded at a compression pressure of 10 kg / m ² via the polyester nonwoven fabric impregnated with 200 g / m ² . The ambient temperature was 22 ° C. As a comparison, the case where the main component of the epoxy resin and the curing agent were mixed and applied to each adhesive surface was also carried out as usual. Table 2 shows the relationship between the compression time and the adhesive strength.

[0014]

[Table 2]

Example 3 When laminating a 10 mm thick birch board, a urea resin adhesive for woodworking (Getalime UA-104 manufactured by Sumitomo Bakelite Co., Ltd.) on both sides of the grind board was 150 g / m ²
It was applied and adhered at a compression pressure of 10 kg / m ² through a Japanese paper (15 g / m ² ) impregnated with a 2% hydrochloric acid aqueous solution 15 g / m ² . The ambient temperature was 20 ° C. Table 3 shows the results of a comparison test with the case where 5 g of a 20% ammonium chloride aqueous solution of a curing agent was added and mixed per 100 g of the urea resin as a usual use method. The adhesion test was based on JISK 6801 (normal state test).

[0016]

[Table 3]

[0017]

As is clear from the above examples, the bonding method and adhesive of the present invention have good workability in the bonding step and can significantly improve the bonding speed.

Claims (3)

[Claims] 1. Adhesion, characterized in that a first component of an adhesive is applied to an adhesive surface, and the second component of the adhesive is impregnated to bond it through a paper / cloth or a net or thread / string. Method. 2. The first component is a moisture-curable urethane resin adhesive or a moisture-curable silicone resin adhesive, and the second component contains water or a curing accelerator for the resin adhesive. The bonding method according to claim 1, which is water. 3. An adhesive comprising two components, wherein one component is impregnated into a paper / cloth or a net-like or thread / string-like material.