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A kind of production method of moisture-proof modified urea-formaldehyde resin adhesive

A technology of urea-formaldehyde resin glue and urea-formaldehyde resin, used in adhesives, adhesive additives, aldehyde/ketone condensation polymer adhesives, etc., can solve the problems of poor moisture resistance and corrosion resistance, low bonding strength, slow curing speed, etc. Good performance, improve moisture resistance, improve water resistance

Active Publication Date: 2017-06-23
广西崇左市中港木业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adhesive has disadvantages such as poor water resistance, low initial adhesion, low bonding strength, slow curing speed, and poor moisture and corrosion resistance.

Method used

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  • A kind of production method of moisture-proof modified urea-formaldehyde resin adhesive

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Experimental program
Comparison scheme
Effect test

Embodiment l

[0027] The production of modified urea-formaldehyde resin comprises the steps:

[0028] Initial stage of reaction: add formaldehyde solution to the polymerization reactor at one time, raise the temperature from room temperature to 50°C, adjust the pH value to 7.5-8.0 with NaOH solution, add urea with 12% weight of formaldehyde solution, and complete the addition within 35-45 minutes , keep warm for 50min.

[0029] Middle stage of reaction: After the initial stage of reaction, add formic acid solution to adjust the pH value of the reaction to 4.8-5.2, add urea with 28% weight of formaldehyde solution, finish adding within 40-50min, then add oxidized starch with 5% weight of formaldehyde solution, and heat up the reaction Liquid to 110 ~ 120 ℃, heat preservation reaction 120min.

[0030] Late stage of reaction: the polymerization stage in the middle stage of the reaction is over, adjust the pH value to 7.5 to 8.5 with NaOH solution, add urea with 40% to 50% of the weight of for...

Embodiment 2

[0033]First prepare polyvinyl acetate emulsion, the preparation method of polyvinyl acetate emulsion is: add polyvinyl alcohol solution with a mass fraction of 5.5% in the reactor, and add emulsifier OP-10 with 33% polyvinyl alcohol mass, stir to adjust the temperature To 60°C, add vinyl acetate with 4.5 times the mass of polyvinyl alcohol to the emulsion and add 44% of the mass of polyvinyl alcohol with a mass fraction of 10% ammonium persulfate solution, replace the air with nitrogen, and keep the temperature at 60°C and reflux React for 45 minutes, then raise the temperature to 85-90°C, then add vinyl acetate 17 times the mass of polyvinyl alcohol drop by drop and ammonium persulfate solution with a mass fraction of 66% of the mass of polyvinyl alcohol and 10% ammonium persulfate solution, keep warm After reacting for 60 minutes, lower the temperature to 50°C, adjust the pH to 5-6 with sodium bicarbonate solution, then add dibutyl phthalate 1.7 times the mass of polyvinyl al...

Embodiment 1

[0034] 55 parts of the modified urea-formaldehyde resin obtained in Example 1, add 5 parts of polyvinyl acetate emulsion and 0.5 part of isobutyltriethoxysilane under stirring, after stirring and mixing evenly, add 25 parts of flour, grind with a three-roll mill 30min to obtain a moisture-proof urea-formaldehyde resin adhesive.

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Abstract

The invention provides a moisture-proof urea-formaldehyde resin adhesive. The raw materials and parts by weight include: 55-75 parts of modified urea-formaldehyde resin, 4-8 parts of polyvinyl acetate emulsion, 0.4-0.9 parts of vinyltrimethoxysilane, 25 to 35 parts of filler; the preparation method is to first prepare modified urea-formaldehyde resin, add formaldehyde at one time, add urea three times, and add oxidized starch and furfuryl alcohol as modifiers during the reaction process, and the production of modified urea-formaldehyde resin There are three stages: the initial stage of the reaction, the middle stage of the reaction, and the late stage of the reaction; after the late polymerization, polyvinyl acetate emulsion and isobutyl triethoxysilane are added, and the filler is added after mixing evenly. Through this process, the gel phenomenon in the polymerization process is avoided. The resulting urea-formaldehyde resin has improved water resistance and low residual formaldehyde. It is used for the production of wood-based panels and can be used in places with high humidity in the south, and the formaldehyde emission is low.

Description

technical field [0001] The invention belongs to the field of modified urea-formaldehyde resin adhesives, and relates to a production method of a modified urea-formaldehyde resin adhesive with good waterproof and moisture-proof properties and low residual formaldehyde. Background technique [0002] Urea-formaldehyde resin or modified urea-formaldehyde resin adhesive is the most widely used adhesive in my country's wood industry, accounting for more than 60% of the total consumption of adhesives in the wood processing industry, accounting for about 90% of the glue used in wood-based panels. Urea-formaldehyde resin adhesive has many advantages, such as high bonding strength, high cold water resistance, rapid curing, good miscibility with water, easy to adjust appropriate viscosity and concentration, etc. In today's society, in order to save wood, protect For forests, the state encourages the use of the three leftovers in forestry production, sawdust, shavings, bark, sanding pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/32C09J103/02C09J11/08C09J11/06C08G12/40
Inventor 谢刚甘伟平韦冠川李珠肖
Owner 广西崇左市中港木业有限公司
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