JPS61225269A - Wood adhesive composition - Google Patents

Abstract

PURPOSE:To provide the titled compsn. having excellent bond strength and suitable for use in bonding wood, consisting of methyl methacrylate, other (meth)acrylate, (meth)acrylic acid, a chlorosulfonated PE, etc., an org. peroxide and a stabilizer. CONSTITUTION:40-70pts.wt. methyl methacrylate (A), 1-20pts. other (meth) acrylate ester (B) [e.g. 2-ethylhexyl (meth)acrylate], 5-15pts.wt. (meth)acrylic acid (C), a chlorosulfonated polyethylene (D) contg. 3-160mmol of sulfonyl chloride moiety and 25-75wt% chlorine per 100g of a polymer produced from PE having a coefficient of melting of 4-500 or a mixture (D) of sulfonyl chloride and a chlorinated polyethylene, 0.01-10pts. (by weight based on the quantity of compsn.; the same applies hereinbelow) org. peroxide (E) such as org. hydroperoxide and 0.01-10pts. stabilizer (F) such as 2,6-di-t-butyl-4-methylphenol are blended together.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to adhesives for wood. More specifically, the present invention relates to an acrylic reactive adhesive that is advantageous for use in bonding where at least one of the adherends is wood.

(B) Prior art and problems Reactive adhesives that do not substantially contain solvents and harden by polymerizing a 7-mer component to strongly bond various types of adherends are well known. For example, two-component adhesives are known. It is a type adhesive, and the first component consists of an acrylic monomer or methacrylic monomer and peroxide or hydroperoxide, and the second component is an activated adhesive that starts polymerization of the acrylic or methacrylic monomer at room temperature. It consists of a drug. Here, the activator is
It is advantageous to have sufficient adhesive strength even in non-stoichiometric amounts relative to the monomer.

U.S. Pat. No. 3,890,407 describes a sulfur-containing composition selected from the group consisting of chlorosulfonated polyethylene and a mixture of sulfonyl chloride and chlorinated polyethylene; Adhesive compositions are shown comprising a solution of at least one polymerizable monomer as well as a free radical generator.

However, although it is known that this type of adhesive composition adheres well to metals, glass, and plastics and exhibits excellent adhesion performance (adhesion speed and adhesive strength), there have been no reports of adhesion to wood. , sufficient adhesion cannot be obtained even if used.

As a result of intensive studies, the present inventors discovered that acrylic reactive adhesives could be advantageously used as adhesives for wood, and found that based on methyl methacrylate, other alkyl methacrylates or alkyl acrylates and methacrylic acid Alternatively, they found that the object could be achieved by using a mixture of a specific amount of acrylic acid and chlorosulfonated polyethylene, and completed the present invention.

(C) Means for Solving the Problem The wood adhesive composition of the present invention consists of (1) 40 to 70 parts by weight of methyl methacrylate, (2) methacrylic ester other than methyl methacrylate and/or acrylic ester. 1 to 20 parts by weight.

(3) Methacrylic acid or/and acrylic acid 5-15
parts by weight, (4) chlorosulfonated polyethylene or a mixture of sulfonyl chloride and chlorinated polyethylene, (5)
It is characterized by consisting of an organic peroxide and (6) a stabilizer.

Examples of methacrylic esters and acrylic esters other than methyl methacrylate used in the adhesive composition of the present invention include 2-ethylhexyl methacrylate and 2-ethylhexyl acrylate.

Tetrahydrofurfuryl methacrylate, tetrahydrofurfuryl acrylate, glycidyl methacrylate, glycidyl acrylate, ethylene glycol dimethacrylate, ethylene glycol diacrylate, triethylene glycol dimethacrylate, 1,3-dibutylene glycol dimethacrylate, trimethylolpropane trimethacrylate, Examples include trimethylolpropane triacrylate, dimethacrylate of 4,4'-diglycidyldiphenylmethane, diacrylate of 4,4'-diglycidyldiphenylmethane, and many other acrylic monomers can be used. .

In the wood adhesive composition of the present invention, the specific mixing ratio of acrylic monomers has the greatest effect on adhesive performance; ~20
It is preferable to mix 5 to 15 parts by weight of methacrylic acid or acrylic acid.

The chlorosulfonated polyethylene used in the present invention contains 25 to 75% by weight of chlorine and 3 to 16% chlorine per 100 g of polymer.
contains 0 mmol of sulfonyl chloride moieties and 4 to 50
It is made from polyethylene with a melt coefficient of 0. Suitable sulfonyl chlorides include, for example, toluenesulfonyl chloride, diphenyl ether-4,4'-disulfonyl chloride, and the like. The ratio of chlorosulfonated polyethylene to polymerizable monomer is 10 to 150 parts by weight of monomer per 100 parts by weight of polymer. The same applies to chlorinated polyethylene.

Also, in the present invention, organic peroxides and organic hydroperoxides are used as free radical generating agents. The amount of organic peroxide is from 0.01 to 10 parts by weight of the total composition. A stabilizer is also added to improve storage stability. The most preferred stabilizer is 2,6-di-t-butyl-4-methylphenol.

The preferred amount of stabilizer is 0.01 to 10 parts by weight of the total composition.

The wood adhesive of the present invention is prepared by mixing a specific amount of methyl methacrylate, other methacrylic esters or acrylic esters, methacrylic acid or acrylic acid, and then chlorinated polyethylene or sulfonyl chloride. It can be easily obtained by simply adding and mixing a mixture with polyethylene, an organic peroxide, and a stabilizer.

The active agent compounds used in the present invention include, for example, tertiary amines (e.g., N,N'-dimethylaniline, N,
N'-diisopropyl-p-toluidine) or condensation products of aldehydes with primary or secondary amines (e.g. condensation products of butyraldehyde with aniline or butylamine; exemplary compounds include Panderbild, PANAX 808 and 833).

According to the present invention, an accelerator is used in conjunction with an activator to increase the rate of adhesive curing. Suitable promoters include oxidizing compounds of transition metals, such as copper naphthenate, cobalt naphthenate.

Included are complexes of iron naphthenate, nickel naphthenate, or acetylacetone with iron, copper, cobalt, or vanadium.

(d) Effect To bond wood using the adhesive of the present invention having the above-mentioned structure, apply an appropriate amount of the active compound to one side of the adherend, and apply the present adhesive to the other side. After applying, all you have to do is press both sides together and cure.

Wood adhesion with sufficient adhesive strength, which was not previously possible with acrylic adhesives, was obtained.

(e) Examples The present invention will be illustrated by examples below, but the present invention is not limited to the examples.

Examples 1-8. Comparative Examples 1 to 2 The copolymerizable monomers shown in Table 1 were added to the amounts of methyl methacrylate shown in Table 1 and mixed well. ) were added in the amounts shown in Table 1, and 1 part each of cumene hydrobor oxide and 2,6-di-t-butyl-4-methylphenol were mixed uniformly to obtain an adhesive.

A wood adhesion test was conducted using these adhesives according to the following method, and the tensile shear strengths are shown in Table 1.

Test method: Using Mizume wood as the wood, the above adhesive was applied to one of the adhesive surfaces, and Banac 808 was applied as an activator to the other adhesive surface.
(Above) was coated with a primer containing 0.1% by weight of copper and bonded by lap (adhesion area 20 x 10 miI)
The bonding conditions were: Adhesive/Brimer: 1O/2, Adhesive application amount: 200g/aJ, Clamping pressure: 0, 25K
g/cd, compression time was 5 minutes, and curing time was 3 days.

From the results in Table 1, it can be seen that the adhesive composition of the present invention exhibits a sufficient adhesive effect on wood.

Claims (1)

[Claims] (1) 40 to 70 parts by weight of methyl methacrylate, (2) methacrylic ester other than methyl methacrylate or/
and 1 to 20 parts by weight of acrylic ester, (3) 5 to 15 parts by weight of methacrylic acid or/and acrylic acid, (4
) A wood adhesive composition comprising chlorosulfonated polyethylene or a mixture of sulfonyl chloride and chlorinated polyethylene, (5) an organic peroxide, and (6) a stabilizer.