阅读说明：本技术 一种双组份拼板胶及其制备方法 (Double-component plate splicing adhesive and preparation method thereof ) 是由 郑伟洲 李佑明 于 2019-11-19 设计创作，主要内容包括：本发明公开了一种双组份拼板胶,其包括基体组分和固化组分；所述基体组分和固化组分的重量比为100；(5-15)；其中,所述基体组分主要由以下原料制成：醋酸乙烯酯、丙烯酸酯、甲基丙烯酸缩水甘油酯、甲基丙烯酸、N-羟甲基丙烯酰胺、聚乙烯醇、乳化剂、缓冲剂、消泡剂、引发剂、增塑剂和水；所述固化组分为多异氰酸酯。本发明以含活性氢的水性聚醋酸乙烯酯乳液为主剂乳液,加入多异氰酸酯为固化剂,即构成水性高分子-异氰酸酯胶粘剂,其具有优良的粘接性能和强度,可常温快速固化。(The invention discloses a two-component plate alignment adhesive, which comprises a matrix component and a curing component; the weight ratio of the matrix component to the curing component is 100; (5-15); wherein the matrix component is mainly prepared from the following raw materials: vinyl acetate, acrylic ester, glycidyl methacrylate, methacrylic acid, N-methylolacrylamide, polyvinyl alcohol, an emulsifier, a buffering agent, a defoaming agent, an initiator, a plasticizer and water; the curing component is a polyisocyanate. The invention takes the water-based polyvinyl acetate emulsion containing active hydrogen as the main agent emulsion, and polyisocyanates as the curing agent, thus forming the water-based polymer-isocyanate adhesive, which has excellent adhesive property and strength and can be rapidly cured at normal temperature.)

1. A two-component plate alignment adhesive is characterized by comprising a matrix component and a curing component; the weight ratio of the matrix component to the curing component is 100; (5-15);

the base body component mainly comprises the following components in parts by weight:

2. the two-component jigsaw of claim 1, wherein the curing component is a polyisocyanate.

3. The two-component plate alignment adhesive of claim 1, wherein the acrylate is methyl acrylate and/or butyl acrylate.

4. The two-component plate alignment adhesive of claim 1, wherein the emulsifier is selected from nonylphenol polyoxyethylene ether; the buffer is sodium bicarbonate and/or sodium acetate.

5. The two-component jigsaw of claim 1, wherein the plasticizer is selected from the group consisting of dioctyl phthalate; the initiator is selected from ammonium persulfate and/or potassium persulfate; the defoaming agent is an organic silicon defoaming agent.

6. The two-component plate alignment adhesive of claim 1, wherein the formulation of the base component further comprises:

0-2 parts of a mildew inhibitor;

0-15 parts of reinforcing agent.

7. The two-component plate alignment adhesive of claim 6, wherein the anti-mildew agent is selected from sodium benzoate; the reinforcing agent is calcium carbonate.

8. The two-component plate alignment adhesive as claimed in claim 1, wherein the base component has the following formula in parts by weight:

9. the method for preparing two-component plate alignment adhesive according to any one of claims 1 to 8, comprising the following steps:

(1) preparing 3-10 wt% of initiator solution;

(2) uniformly mixing vinyl acetate, acrylic ester, glyceryl methacrylate, N-hydroxymethyl acrylamide and acrylic acid to obtain a mixed monomer;

(3) adding polyvinyl alcohol and water into a reaction kettle, heating to 80-100 ℃, stirring and dissolving for 30-60 minutes, cooling to 50-70 ℃, adding 10-20% of initiator solution, buffering agent and defoaming agent, and emulsifying for 5-20 minutes;

(4) heating to 75-85 ℃, preserving the temperature for 30-40 minutes, and synchronously dropwise adding the rest mixed monomer and the initiator solution into the reaction kettle within 4-5 hours; heating to 80-90 ℃, reacting for 30-90 minutes under heat preservation, cooling to below 50 ℃, adding a plasticizer, continuously stirring for 20-50 minutes, and filtering to obtain a matrix component;

(5) providing a curing component, and independently packaging the matrix component and the curing component to obtain a finished product of the two-component plate alignment adhesive.

Technical Field

The invention relates to the technical field of adhesives, in particular to a two-component plate alignment adhesive and a preparation method thereof.

Background

The panel glue is an adhesive used for splicing wood products such as laminated wood and is suitable for panel bonding of non-structural materials, structural laminated materials and the like. The adhesives commonly used in the industries of various wooden articles, furniture and decoration and finishing in China mainly comprise urea formaldehyde, phenolic resin, melamine formaldehyde glue (namely, trialdehyde glue) and polyvinyl acetate emulsion (white glue).

The main formula raw materials of the products of urea formaldehyde, phenolic resin and melamine formaldehyde glue (namely, trialdehyde glue) are as follows: urea, formaldehyde, melamine, a catalyst and water. In the process of synthesizing the formaldehyde-formaldehyde glue by reacting the raw materials, the formaldehyde release amount is high, the air environment is seriously polluted, and the harm to the human body is quite large. In addition, the glue layer of the trialdehyde glue has large brittleness and short service life.

The main raw materials of the polyvinyl acetate emulsion (white glue) product comprise vinyl acetate, polyvinyl alcohol resin, OP initiator, dibutyl ester plasticizer, sodium bicarbonate and water. The main agent formed by the reaction and polymerization of the raw materials reacts with the curing agent, and the cured adhesive film layer has the advantages of large softness, poor antifreezing property, no water resistance and no heat resistance.

Disclosure of Invention

The invention aims to solve the technical problem of providing a two-component plate splicing adhesive which is strong in water resistance, high in bonding strength and high-temperature resistant.

The invention also provides a preparation method of the double-component plate alignment adhesive.

In order to solve the technical problems, the invention provides a two-component plate alignment adhesive, which comprises a matrix component and a curing component; the weight ratio of the matrix component to the curing component is 100; (5-15);

the base body component mainly comprises the following components in parts by weight:

as an improvement of the technical scheme, the curing component is polyisocyanate.

As an improvement of the technical scheme, the acrylic ester is methyl acrylate and/or butyl acrylate.

As an improvement of the technical scheme, the emulsifier is nonylphenol polyoxyethylene ether; the buffer is sodium bicarbonate and/or sodium acetate.

As an improvement of the technical scheme, the plasticizer is dioctyl phthalate; the initiator is selected from ammonium persulfate and/or potassium persulfate; the defoaming agent is an organic silicon defoaming agent.

As an improvement of the above technical solution, the formulation of the matrix component further comprises:

0-2 parts of a mildew inhibitor;

0-15 parts of reinforcing agent.

As an improvement of the technical scheme, the mildew preventive is sodium benzoate; the reinforcing agent is calcium carbonate.

As an improvement of the technical scheme, the formula of the matrix component in parts by weight is as follows:

correspondingly, the invention also discloses a preparation method of the two-component plate alignment adhesive, which comprises the following steps:

(1) preparing 3-10 wt% of initiator solution;

(2) uniformly mixing vinyl acetate, acrylic ester, glyceryl methacrylate, N-hydroxymethyl acrylamide and acrylic acid to obtain a mixed monomer;

(3) adding polyvinyl alcohol and water into a reaction kettle, heating to 80-100 ℃, stirring and dissolving for 30-60 minutes, cooling to 50-70 ℃, adding 10-20% of initiator solution, buffering agent and defoaming agent, and emulsifying for 5-20 minutes;

(4) heating to 75-85 ℃, preserving the temperature for 30-40 minutes, and synchronously dropwise adding the rest mixed monomer and the initiator solution into the reaction kettle within 4-5 hours; heating to 80-90 ℃, reacting for 30-90 minutes under heat preservation, cooling to below 50 ℃, adding a plasticizer, continuously stirring for 20-50 minutes, and filtering to obtain a matrix component;

(5) providing a curing component, and independently packaging the matrix component and the curing component to obtain a finished product of the two-component plate alignment adhesive.

The implementation of the invention has the following beneficial effects:

1. the invention takes the water-based polyvinyl acetate emulsion containing active hydrogen as the main agent emulsion, and polyisocyanates as the curing agent, thus forming the water-based polymer-isocyanate adhesive, which has excellent adhesive property and strength and can be rapidly cured at normal temperature.

2. According to the invention, glycidyl methacrylate and N-hydroxymethyl acrylamide are introduced into the formula, and after other vinyl acetate is copolymerized, the adhesive force to wood is strong, and the wood has excellent high temperature resistance, water resistance and weather resistance.

3. According to the invention, acrylic acid and methyl acrylate are introduced into the formula, and through the matching of the acrylic acid and the methyl acrylate, the water resistance of the vinyl acetate homopolymerization emulsion can be effectively improved, and the water resistance of the plate alignment adhesive is improved, so that the plate alignment adhesive still has higher strength after being soaked in water and boiled in water.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to specific embodiments.

The invention provides a two-component plate alignment adhesive, which comprises a matrix component and a curing component; the weight ratio of the matrix component to the curing component is 100; (5-15); preferably, the weight ratio of the matrix component to the curing component is 100: (5-10).

The curing component is selected from polyisocyanate, specifically selected from diphenylmethane diisocyanate or polymethylene polyphenyl polyisocyanate, but not limited thereto.

The base body mainly comprises the following components in parts by weight:

wherein the acrylate is methyl acrylate and/or butyl acrylate, which can improve the water resistance of vinyl acetate. Preferably, methyl acrylate is selected, the cross-linking effect of the methyl acrylate and the main monomer is stronger, the water resistance of vinyl acetate can be effectively improved, and the plate alignment adhesive still has good bonding strength after being soaked in water and boiled in water.

In order to further improve the water resistance of the plate alignment adhesive, methacrylic acid is combined, and hydroxyl can be introduced into a polymer through the methacrylic acid and methyl acrylate to improve the water resistance. Preferably, the ratio of the amount of methacrylic acid used to the amount of methyl acrylate used is 1: (4-10), the methacrylic acid and the methyl acrylate in the proportion range can smoothly and fully react with the main monomer, and the boiling water resistance is greatly improved. Further preferably, the ratio of the amount of methacrylic acid to methyl acrylate is 1: 5.

after the N-methylol acrylamide and the vinyl acetate are copolymerized, the cohesive strength is high, and the bonding strength and the high-temperature resistance of the plate alignment adhesive can be effectively improved; furthermore, the invention also introduces the glycerol methacrylate which can also play a role in improving the bonding strength. By the multi-component copolymerization of unsaturated acrylic acid, glyceryl methacrylate, N-hydroxymethyl acrylamide and vinyl acetate, the plate alignment adhesive with high temperature resistance, strong water resistance and excellent bonding performance can be formed.

In order to improve the water resistance of the plate alignment adhesive, RS series polyvinyl alcohol can be selected as the polyvinyl alcohol in the invention.

Wherein, the emulsifier is nonylphenol polyoxyethylene ether, but is not limited to the nonylphenol polyoxyethylene ether.

Wherein the buffer is sodium bicarbonate and/or sodium acetate; preferably, sodium bicarbonate is used.

Wherein, the plasticizer is selected from dioctyl phthalate, but is not limited to the dioctyl phthalate. The compatibility of the dioctyl phthalate and the vinyl acetate-acrylic emulsion is good.

Wherein the initiator is aqueous peroxide, such as ammonium sulfate and/or potassium persulfate; preferably, the initiator is ammonium persulfate.

Wherein, the defoaming agent is an organic silicon defoaming agent.

Preferably, the matrix component of the present invention further comprises:

0-2 parts of a mildew inhibitor;

0-15 parts of reinforcing agent.

The mildew inhibitor can effectively kill aspergillus niger, aspergillus flavus, aspergillus versicolor, trichoderma, cladosporium, paecilomyces and other molds, has a wide and long-acting bactericidal spectrum, can prevent microbial development for a long time, and prolongs the storage time of products for one year.

The reinforcing agent may be calcium carbonate and/or precipitated barium sulfate, but is not limited thereto. Preferably, calcium carbonate is selected.

Preferably, the preferred formulation of the matrix component of the present invention is as follows:

correspondingly, the invention also provides a preparation method of the double-component plate alignment adhesive, which comprises the following steps:

s1: preparing 3-10 wt% of initiator solution;

specifically, part of water is mixed with an initiator to obtain an initiator solution with the mass fraction of 3-10%, preferably, the mass fraction of the initiator solution is 5%.

S2: uniformly mixing vinyl acetate, acrylic ester, glyceryl methacrylate, N-hydroxymethyl acrylamide and acrylic acid to obtain a mixed monomer;

s3: adding polyvinyl alcohol and water into a reaction kettle, heating to 80-100 ℃, stirring and dissolving for 30-60 minutes, cooling to 50-70 ℃, adding 10-20% of initiator solution, buffering agent and defoaming agent, and emulsifying for 5-20 minutes;

s4: heating to 75-85 ℃, preserving the temperature for 30-40 minutes, and synchronously dropwise adding the rest mixed monomer and the initiator solution into the reaction kettle within 4-5 hours; heating to 80-90 ℃, reacting for 30-90 minutes under heat preservation, cooling to below 50 ℃, adding a plasticizer, continuously stirring for 20-50 minutes, and filtering to obtain a matrix component;

s5: providing a curing component, and independently packaging the matrix component and the curing component to obtain a finished product of the two-component plate alignment adhesive.

The invention is illustrated below by means of specific examples: