KR100341985B1 - Structural Acrylic Adhesive Composition - Google Patents

Abstract

The present invention is characterized in that the main component is composed of one or two types of acrylic monomers and syrups of acrylic polymers, polyfunctional acrylic monomers, unsaturated polycarboxylic acids, amine compounds, organic transition metal compounds, or sulfimides, and organic peroxides. As a structural acrylic adhesive composition to have an excellent adhesive strength and the curing speed is fast regardless of the ambient temperature has the advantage of having excellent workability and weather resistance.

Description

Structural Acrylic Adhesive Composition

The present invention relates to an acrylic adhesive composition, particularly to a structural acrylic adhesive composition having excellent adhesion, short reaction time, excellent weather resistance and storage property.

Structural acrylic adhesives bond surfaces of various materials by polymerization of monomers. Such an adhesive composition is usually divided into two parts. One part consists of a polymerizable acrylic or methacrylate ester and an organic peroxide which is a free radical generator, and the other part consists of a catalyst which polymerizes the monomer at room temperature. A common method of bonding two sides is to use a catalyst portion and a monomer portion of an adhesive by applying a catalyst portion to the side to be bonded and then bonding the two sides by applying a portion containing a polymerizable monomer to the other side. There is no need to mix before.

Conventional adhesives in this field are disclosed in US Pat. Nos. 3890407 and 4263419, but these adhesives have strong adhesion and functionality, but have disadvantages of poor workability due to shelf life and long curing time. This disadvantage is because the continuous polymerization of the monomer is hampered by the chemical composition of the adhesive composition and the state of the adhesive surface.

The present invention is to solve this problem, it has excellent adhesive strength to withstand long-term load, especially the curing speed is excellent regardless of the ambient temperature, excellent workability and excellent weather resistance to the initial state even after curing It is to provide an acrylic adhesive composition to maintain.

Adhesive composition of the present invention for achieving the above object is

(1) a polymerizable monomer or acrylic syrup,

(2) at least one polyfunctional acrylic monomer,

(3) unsaturated dicarboxylic acid esters,

(4) an amine compound,

(5) an organic transition metal compound or sulfimide, and

(6) It consists of organic peroxide.

The polymerizable monomer used in the present invention is preferably a vinyl monomer, preferably an acrylic monomer, and the acrylic syrup is composed of one kind of acrylic monomer or two species of monomer and a polymer thereof, and the content of the polymer in the syrup is 10 to 70% by weight, preferably 20 to 40% by weight.

As the multifunctional acrylic monomer used in the present invention, a monomer having three or more unsaturated ethylene double bonds copolymerizable with the monomer of (1) is used, preferably pentaacryltriol tetraacrylate and the content is 100 parts by weight of syrup. 5 to 20 parts by weight, preferably 5 to 15 parts by weight.

The unsaturated dicarboxylic acid ester used in the present invention is preferably an alkyl ester, preferably fumaric acid or maleic acid, and the content is 5 to 20 parts by weight and preferably 7 to 13 parts by weight based on 100 parts by weight of the monomer to syrup. to be.

An amine compound in this invention is a tertiary amine compound which has a structural formula like following formula (1).

Wherein R ₁ is hydrogen, hydroxy, amino, halogen, alkyl group or alkoxy group having 1 to 8 carbon atoms, preferably alkyl group or alkoxy group of 1 to 4,

R ² is methylene, R ₃ and R ₄ are independently alkyl or alkoxy having 1 to 4 carbon atoms,

n is 0 or 1,

m is an integer of 1-3.

For example, N, N-dimethyl aniline, N, N-diethyl aniline, and the like, preferably N, N-dihydroxyethyl-para-toluidine, and the content is 0.1 to 1 parts by weight, preferably 0.2 to 0.6 The weight part is good.

The transition metal compound used in the present invention serves to promote the polymerization reaction, cobalt, copper, iron, manganese, vanadium of naphthalic acid is used, preferably iron propionate and sulfide or a mixture thereof. The content is appropriately 0.001 to 0.01 parts by weight, preferably 0.003 to 0.007 parts by weight.

The free radical generator, which is the reaction initiator of the present invention, is used as an organic oxide, for example, cumin hydroperoxide, dibenzoyl peroxide, methyl ethyl ketone peroxide, or a mixture thereof, preferably cumin hydroperoxide, It is suitable for 5 to 30 parts by weight with respect to 100 parts by weight of silver syrup, preferably 10 to 25 parts by weight.

Unlike the prior art, the present invention having the ease of the curing mechanism can be added to the main material or the curing agent, and the curing initiator and the accelerator can be added separately from the free radical generating agent so that the mixing ratio is considered in consideration of the ambient temperature. I can regulate it.

The acrylic adhesive of the present invention has excellent adhesive strength and durability, short curing time, workability is good, and solves the disadvantage of the prior art that the adhesive strength is lowered when the time after the initial bonding is cured.

Hereinafter, the present invention will be described in detail with reference to Examples.

Examples 1-3 and Comparative Examples 1-2

Examples 1 to 3 and Comparative Examples 1 to 2 were prepared in the composition ratios shown in Table 1 and carried out according to a known production method, and the physical properties are shown in Table 2. However, each component value is a weight part.

Table 1

* Consists of acrylate, methyl acrylate, and polyacrylic acid and has a viscosity of 2000 cps.

Table 2 Physical Properties of Examples

* Tensile strength: This is the strength when two specimens of specimen (100 × 25 × 6mm) are face-to-face and after 24 hours of adhesive hardening, they are bitten by an Instron machine and pulled at a speed of 2.8 mm / min to break.

* Setting time: record the time that post-working is possible after applying adhesive to the specimen.

Claims (8)

(1) 100 parts by weight of a polymerizable monomer or acrylic syrup, (2) 5 to 20 parts by weight of one or more polyfunctional acrylic monomers, (3) 5 to 20 parts by weight of unsaturated dicarboxylic acid, (4) 0.1 to 1 part by weight of the amine compound, (5) 0.001 to 0.01 parts by weight of an organic transition metal compound or sulfimide, and (6) A structural acrylic adhesive composition comprising 5 to 30 parts by weight of an organic peroxide, wherein the parts by weight of the components (2) to (6) are based on 100 parts by weight of the component (1). The method of claim 1, The polymerizable monomer is an acrylic monomer, and the acrylic syrup is composed of one or two kinds of acrylic monomers and polymers thereof. The method of claim 2, A structural acrylic adhesive composition, wherein the composition ratio of the acrylic polymer in the acrylic syrup is 10 to 70% by weight. The method of claim 1, The structural acrylic adhesive composition, wherein the polyfunctional acrylic monomer is pentaacryltriol tetraacrylate. The method of claim 1, Structural acrylic adhesive composition, wherein the unsaturated dicarboxylic acid is selected from fumaric acid, maleic acid or mixtures thereof. The method of claim 1, A structural acrylic adhesive composition, wherein the amine compound is N, N-dihydroxyethyl-para-toluidine. The method of claim 1, Structural acrylic adhesive composition, characterized in that the organic transition metal compound is iron propionate. The method of claim 1, Structural acrylic adhesive composition, characterized in that the organic peroxide is cumin hydroperoxide.