Preparation and application method of a main agent of age-modified PVAC formaldehyde-free adhesive

An aldehyde adhesive and modification technology, applied in the direction of adhesives, adhesive types, epoxy resin adhesives, etc., can solve the problems of unsuitability for large-scale production, low bonding strength, fast curing speed, etc., to increase the solid content and emulsion stability, increased strength, and increased scale effects

Active Publication Date: 2022-05-06
DEHUA TB NEW DECORATION MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are two commonly used methods in the prior art. One is to form a protective colloid by adding polyvinyl alcohol to the emulsion system to improve the stability of the emulsion, and to add 2-hydroxyethyl acrylate and vinyl tertiary carbonate to carry out ternary copolymerization in the later stage of synthesis. , reduce the colloidal particle size increase caused by a single VAC reaction, and produce a stable emulsion with low viscosity and high solidity, but this stable emulsion has low bonding strength and poor water resistance
The other is that when synthesizing polyvinyl acetate emulsion, N-methylolacrylamide and other chain segments containing amino groups and hydroxyl groups are introduced. When used, the polyvinyl acetate emulsion is mixed with a certain proportion of polyurethane prepolymer, The NCO in the polyurethane prepolymer reacts with the hydroxyl and amine groups in the polyvinyl acetate adhesive and the adhered material to improve the bonding strength, but this method has a fast curing speed and a short pot life, which is not suitable for large-scale production

Method used

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  • Preparation and application method of a main agent of age-modified PVAC formaldehyde-free adhesive
  • Preparation and application method of a main agent of age-modified PVAC formaldehyde-free adhesive
  • Preparation and application method of a main agent of age-modified PVAC formaldehyde-free adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of preparation method of AGE modified PVAc formaldehyde-free adhesive main agent, concrete steps are as follows:

[0037] S1. Add 0.3 parts of polyvinyl alcohol PVA17-88 dropwise to 32 parts of hot water, heat to about 90°C to fully dissolve, then cool down to 50°C for later use;

[0038] S2. Continuously add the mixture of allyl glycidyl ether AGE, vinyl acetate and initiator dropwise into 80°C methyl ethyl ketone solvent for reflux reaction within 3 hours, and heat up to 85°C to continue reflux after the mixture is added dropwise React for 1.5 hours, then further heat up to 90°C, distill off the solvent under vacuum, and cool down the distilled solvent to 43°C to obtain a prepolymer for use;

[0039]S3. Add the prepolymer prepared in the step S2 to 3 parts of non / anionic composite emulsifiers, stir at high speed for 10 minutes, and add the polyvinyl alcohol-containing polyvinyl alcohol prepared in the step S1 dropwise. Then continue to stir at high speed for 1...

Embodiment 2

[0048] A kind of preparation method of AGE modified PVAc formaldehyde-free adhesive main agent, concrete steps are as follows:

[0049] S1. Add 0.3 parts of polyvinyl alcohol PVA17-88 dropwise to 32 parts of hot water, heat to about 90°C to fully dissolve, then cool down to 50°C for later use;

[0050] S2. Continuously add the mixture of allyl glycidyl ether AGE, vinyl acetate and initiator dropwise into 80°C methyl ethyl ketone solvent for reflux reaction within 3 hours, and heat up to 85°C to continue reflux after the mixture is added dropwise React for 1.5 hours, then further heat up to 90°C, distill off the solvent under vacuum, and cool down the distilled solvent to 43°C to obtain a prepolymer for use;

[0051] S3. Add the prepolymer prepared in the step S2 to 3 parts of non / anionic composite emulsifiers, stir at high speed for 10 minutes, and add the polyvinyl alcohol-containing polyvinyl alcohol prepared in the step S1 dropwise. Then continue to stir at high speed for ...

Embodiment 3

[0060] A kind of preparation method of AGE modified PVAc formaldehyde-free adhesive main agent, concrete steps are as follows:

[0061] S1. Add 0.3 parts of polyvinyl alcohol PVA17-88 dropwise to 32 parts of hot water, heat to about 90°C to fully dissolve, then cool down to 50°C for later use;

[0062] S2. Continuously add the mixture of allyl glycidyl ether AGE, vinyl acetate and initiator dropwise into 80°C methyl ethyl ketone solvent for reflux reaction within 3 hours, and heat up to 85°C to continue reflux after the mixture is added dropwise React for 1.5 hours, then further heat up to 90°C, distill off the solvent under vacuum, and cool down the distilled solvent to 43°C to obtain a prepolymer for use;

[0063] S3. Add the prepolymer prepared in the step S2 to 3 parts of non / anionic composite emulsifiers, stir at high speed for 10 minutes, and add the polyvinyl alcohol-containing polyvinyl alcohol prepared in the step S1 dropwise. Then continue to stir at high speed for ...

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Abstract

The invention discloses the preparation and application method of a main agent of AGE-modified PVAC aldehyde-free adhesive. Anionic composite emulsifiers are mixed with PVA protective colloid aqueous solutions containing different molecular weights for inverse emulsification, and the remaining PVAC, functional monomer ethylene carbonate, and isooctyl acrylate are added to obtain a high-solid content modified PVAC emulsion adhesive. Anionic / PVA composite emulsification system and inverse emulsification process can improve the uniformity of micelles, thereby increasing the solid content and emulsion stability. During use, epoxy curing agent is added according to the requirements of use, and the cross-linking between PVAC molecular chains is formed through the reaction of epoxy and curing agent to improve the strength of PVAC adhesive. Epoxy groups are more stable than isocyanate in water and react relatively mildly. The pot life of the adhesive can be adjusted by selecting different curing agents, so as to effectively solve the problem of improving strength and prolonging pot life.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a preparation method of an AGE-modified PVAc formaldehyde-free adhesive main agent and a method for using the same. Background technique [0002] As a paint emulsion, polyvinyl acetate (PVAc) is a kind of modified polyvinyl acetate adhesive, which is low in price, high in bonding strength, and free of environmental pollution. It is suitable for wood processing, but it has the disadvantages of poor water resistance and aging resistance and soft coating film. Adhesives used in the traditional wood industry are mainly pulse formaldehyde resin (UF), phenolic resin (PF), melamine-formaldehyde resin (MF) and polyvinyl acetate emulsion (PVAc). With the improvement of the industry, aldehyde-free adhesives such as polyurethane adhesives, biomass protein adhesives, and modified polyvinyl acetate adhesives have been gradually introduced into the wood industry, and certain research progre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J163/00C08G59/32C08F263/04C08F218/08C08F218/10C08F220/18C08F2/32
CPCC09J163/00C08G59/3209C08F263/04C08F2/32C08F218/08C08F218/10C08F220/1808
Inventor 贾焕亮吴华冲程明娟张晓伟丁涛赵建锋冯越敏
Owner DEHUA TB NEW DECORATION MATERIAL CO LTD
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