JPS6251309B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a solvent-based adhesive for building materials that uses a vinyl acetate copolymer as a vehicle. Methanol paste using polyvinyl acetate as a vehicle is widely known as a solvent-based adhesive used for applications such as building interiors because it is inexpensive and has good adhesion to a relatively wide range of adherends.
Because the initial adhesion is not always sufficient, nails are used in conjunction with ceiling materials, temporary fixing with adhesive tape is used to adhere wooden bricks, etc., and adhesive tape is used to prevent joints from lifting when adhering flooring materials. Each method requires the use of sandbags, which has the disadvantage of complicating the work. In order to overcome these drawbacks, attempts have been made to use additives such as the addition of rosin or phenolic resin tackifiers and plasticizers, but these improvements have not yet been sufficient. The present invention improves the above-mentioned drawbacks of conventional solvent-based adhesives by copolymerizing specific components into a vinyl acetate polymer. The solvent-based adhesive of the present invention contains vinyl acetate (A) 80~
99.9% by weight, 0.1 to 10% by weight of a monomer (B) having two or more polymeric unsaturated groups in the molecule selected from specific compounds diallyl phthalate, diethylene glycol dimethacrylate, trimethylolpropane triacrylate, and other than the above. It is made using a methanol solution of vinyl acetate copolymer (X) having a composition consisting of 0 to 19.9% by weight of vinyl monomer (C) as a vehicle, and the initial adhesive strength to adherends for building materials is significantly improved. This effect is achieved. The vinyl acetate copolymer (X) used in the present invention is as described above: Vinyl acetate (A) 80 to 99.9% by weight Monomer (B) having two or more polymerizable unsaturated groups in the molecule 0.1 to 10% by weight % Vinyl monomer (C) other than the above 0 to 19.9% by weight of each component. Vinyl acetate (A) component is the main component of the copolymer,
If the copolymerization ratio is less than 80% by weight, the adhesive strength itself will be insufficient, while if it exceeds 99.9% by weight, it will be relatively
Since the amount of component (B) will be too small, no effect on improving initial adhesive strength can be expected. The monomer (B) component having two or more polymerizable unsaturated groups in the molecule is a modifying component, and if its copolymerization ratio is less than 0.1% by weight, the initial adhesion strength improvement effect will not be sufficiently exhibited; When the proportion exceeds 10% by weight, the resulting paste tends to gel, making it difficult to put it to practical use. Particularly preferred range is 0.1 to 5
Weight%. Such component (B) includes diallyl phthalate, ethylene glycol dimethacrylate, trimethylolpropane triacrylate,
etc. Two or more of these can also be used in combination. The vinyl acetate copolymer of the present invention has the above (A) and (B)
It consists of two components, but in addition to these two components, there is a maximum of 19.9
Vinyl monomers (C) other than those mentioned above may be included as a remainder within a range of up to % by weight. A content of component (C) in excess of 19.9% by weight should be avoided since the properties of the vinyl acetate copolymer, such as adhesiveness, low cost, and methanol solubility, will be impaired. Component (C) includes unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid, or alkyl esters and salts thereof; unsaturated dicarboxylic acids such as maleic acid, fumaric acid, and itaconic acid, and monoalkyl esters thereof; Dialkyl esters, anhydrides and salts, acrylonitrile and methacrylonitrile, acrylamide and methacrylamide, vinyl esters other than vinyl acetate such as vinyl propionate, vinyl stearate, vinyl versatate, vinyl chloride, carbon atoms of 2 to 20 or more Examples include olefin. The adhesive of the present invention uses the above-mentioned vinyl acetate copolymer (X) as a vehicle, as well as a filler (Y).
and methanol is used as an organic solvent. As the filler (Y), various fillers including asbestos, calcium carbonate, clay, talc, titanium oxide, and fly ash are used. The amount of the filler (Y) to be blended is not particularly limited, but it is often selected from a range of 20 to 500% by weight based on the vinyl acetate copolymer (X). In addition to the above components (X), (Y), and methanol, the adhesive of the present invention may further include rosin, a rosin derivative, and polyvinyl acetate or vinyl acetate copolymer that does not contain the above component (B). , a plasticizer, a coloring agent, etc. may be added in appropriate amounts. Further, there is no problem even if water is present in an amount of about 20% or less relative to the organic solvent. The adhesive for building materials of the present invention can be used for adhesion of floors, walls, ceilings, etc., such as adhesion of PVC tiles, adhesion of long tiles, adhesion of body edges, adhesion of wooden bricks, adhesion of plastic sheets, and sound absorption boards. Used for adhesion, etc. Next, the solvent-based adhesive of the present invention will be further explained with reference to examples. Hereinafter, "parts" and "%" are expressed on a weight basis. Also, the viscosity of the paste is 25℃
This is the measured value at . Example 1 99.7 parts of vinyl acetate and 0.3 parts of dialiphthalate were solution polymerized in 100 parts of methanol by a conventional method to obtain a vinyl acetate copolymer concentration of 50% and a viscosity of 10,000 cps.
A methanol paste was obtained. An adhesive was prepared by adding and mixing 140 parts of asbestos, 60 parts of calcium carbonate, and 80 parts of methanol to 200 parts of this paste. This adhesive was applied onto a slate board using a trowel, and the hard vinyl chloride resin board was bonded with finger pressure, and the tensile adhesive strength was immediately measured. In addition, this adhesive was applied to the concrete floor surface using a trowel at a concentration of approximately 300 g/m ² , and then high-resilience floor tiles were attached, and then left to dry without applying any particular load. No lifting of the joint was observed at all. The above results are shown in Table 1. Control Example 1 An adhesive was prepared in the same manner as in Example 1 except that a methanol paste of vinyl acetate homopolymer with a polymer concentration of 49.8% and a viscosity of 10,300 cps was used. Adhesive construction was performed. The results are also shown in Table 1.

[Table] Examples 2 to 4, Control Examples 2 to 4 Adhesives were prepared in the same manner as in Example 1 except that methanol paste of the following polymer was used, and the tensile adhesive strength was measured and the adhesion of high resilience floor tiles was performed. carried out the construction. Example 2 Concentration of a copolymer with a composition of 95% vinyl acetate and 5% ethylene glycol dimethacrylate
Methanol paste with 48.5% and viscosity of 3000cps. Control example 2 Vinyl acetate homopolymer concentration 50%, viscosity
30000cps methanol paste. Example 3 Vinyl acetate 87.5%, diallyl phthalate 0.5%
and the concentration of a copolymer with a composition consisting of 12% ethylene.
45% methanol paste with a viscosity of 6000 cps. Control Example 3 Methanol paste with a concentration of 47% and a viscosity of 8000 cps of a copolymer consisting of 87% vinyl acetate and 13% ethylene. Example 4 A copolymer of 79% vinyl acetate, 1% trimethylolpropane triacrylate and 20% ethyl acrylate has a concentration of 48% and a methanol paste with a viscosity of 9800 cps has a concentration of 49.8% of the vinyl acetate homopolymer of Control Example 1. , a mixed paste made by mixing methanol paste with a viscosity of 10,300 cps at a weight ratio of 70:30. Control Example 4 Methanol paste of the vinyl acetate homopolymer of Control Example 1 with a concentration of 49.8% and a viscosity of 10,300 cps was added to a methanol paste of a copolymer with a composition of 80% vinyl acetate and 20% ethyl acrylate with a concentration of 50% and a viscosity of 6000 cps. Mixed paste mixed at a weight ratio of 70:30. The results of Examples 2 to 4 and Control Examples 2 to 4 are shown in Table 2.

[Table] Example 5 Vinyl acetate 89.5%, diallyl phthalate 0.5%
Methanol paste with a copolymer concentration of 50% and a viscosity of 35,000 cps consisting of 10% and methyl methacrylate.
An adhesive was prepared by adding and mixing 200 parts of asbestos, 150 parts of asbestos, and 50 parts of methanol, and wooden bricks were adhered to the concrete surface. Control Example 5 An adhesive was prepared in the same manner as in Example 5 except that methanol paste with a concentration of 50% copolymer consisting of 90% vinyl acetate and 10% methyl methacrylate and a viscosity of 40,000 cps was used, and was applied to a concrete surface and a wooden brick. Gluing was performed with Example 6 An adhesive was prepared in the same manner as in Example 5, except that methanol paste with a 50% concentration of a copolymer consisting of 82% vinyl acetate, 8 parts ethylene glycol dimethacrylate, and 10% vinyl versatate and a viscosity of 15,000 cps was used. , the concrete surface and the wooden brick were bonded together. Control example 6 90% vinyl acetate and 10% vinyl versatile acid
An adhesive was prepared in the same manner as in Example 5, except that a methanol paste with a copolymer concentration of 50% and a viscosity of 17,000 cps was used to bond the concrete surface and the wooden bricks. The tensile adhesive strengths of Examples 5 and 6 and Control Examples 5 and 6 were as follows. Example 5 3.21Kg/25mm×25mm Control example 5 1.93Kg/25mm×25mm Example 6 3.15Kg/25mm×25mm Control example 6 1.90Kg/25mm×25mm

Claims (1)

[Scope of Claims] 1. A monomer (B) having two or more polymerizable unsaturated groups in the molecule selected from 80 to 99.9% by weight of vinyl acetate (A), diallyl phthalate, diethylene glycol dimethacrylate, and trimethylolpropane triacrylate. ) A solvent-based adhesive for building materials, which is made of a methanol solution of a vinyl acetate copolymer (X) having a composition of 0.1 to 10% by weight and 0 to 19.9% by weight of a vinyl monomer (C) other than the above. 2. The adhesive according to claim 1, which contains a vinyl acetate copolymer (X) as a vehicle, a filler (Y), and an organic solvent (Z). 3. The adhesive according to claim 2, wherein the filler (Y) is asbestos or calcium carbonate.