Preparation method and use method of AGE modified PVAc formaldehyde-free environment-friendly adhesive

A technology of aldehyde adhesives and adhesives, which is applied in the field of preparation of AGE-modified PVAc aldehyde-free environmentally friendly adhesives, can solve the problems of unsuitability for large-scale production, fast curing speed, and low bonding strength, and achieve improved solidification. Effects of content and emulsion stability, scale-up, strength improvement

Active Publication Date: 2020-12-11
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 method and use method of AGE modified PVAc formaldehyde-free environment-friendly adhesive
  • Preparation method and use method of AGE modified PVAc formaldehyde-free environment-friendly adhesive
  • Preparation method and use method of AGE modified PVAc formaldehyde-free environment-friendly adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of preparation method of AGE modified PVAc formaldehyde-free environmental protection adhesive, concrete steps are as follows:

[0039] 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;

[0040]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;

[0041] 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 hi...

Embodiment 2

[0050] A kind of preparation method of AGE modified PVAc formaldehyde-free environmental protection adhesive, concrete steps are as follows:

[0051] 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;

[0052] 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;

[0053] 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 h...

Embodiment 3

[0062] A kind of preparation method of AGE modified PVAc formaldehyde-free environmental protection adhesive, concrete steps are as follows:

[0063] 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;

[0064] 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;

[0065] 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 h...

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Abstract

The invention discloses a preparation method and application method of an AGE modified PVAc formaldehyde-free environment-friendly adhesive. in the preparation process, part of PVAC is reacted with AGE to form an active prepolymer, the active prepolymer is mixed with a non- / anionic composite emulsifier, an aqueous solution containing PVA protective colloid with different molecular weights are added, and reversed-phase emulsification is carried out; the high-solid-content modified PVAC emulsion adhesive is prepared by further adding residual PVAC, functional monomer ethylene carbonate and 2-ethylhexyl acrylate. The uniformity of micelles can be improved by adopting a non-reactive anion / reactive anion / PVA composite emulsification system and a reversed-phase emulsification process, so that the solid content and the emulsion stability are improved. In the using process, the epoxy curing agent is added according to the using requirement, crosslinking between PVAC molecular chains is formedthrough the reaction of epoxy and the curing agent, and the strength of the PVAC adhesive is improved. The epoxy group is more stable in water than isocyanate, the reaction is relatively mild, and theworking life of the adhesive can be adjusted by selecting different curing agents, so that the aims of improving the strength and prolonging the working life are effectively achieved.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to the preparation and use method of an AGE-modified PVAc formaldehyde-free environmentally friendly adhesive. 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 progress has b...

Claims

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Application Information

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Patent Type & Authority Applications(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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