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Production method of moisture-proof modified urea resin adhesive

A urea-formaldehyde resin glue, urea-formaldehyde resin technology, applied in the direction of 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: 2015-07-08
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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  • Production method of moisture-proof modified urea resin adhesive

Examples

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 , heat preservation reaction 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 ...

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 modified urea resin adhesive. The moisture-proof modified urea resin adhesive is prepared from the following raw materials in parts by weight: 55-75 parts of modified urea resin, 4-8 parts of polyvinyl acetate emulsion, 0.4-0.9 part of vinyltrimethoxysilane and 25-35 parts of filler; the preparation method of the moisture-proof modified urea resin adhesive comprises the following steps: firstly, preparing the modified urea resin, adding formaldehyde at a time, adding urea at three times, and adding oxidized starch and furfuryl alcohol in the reaction process as modifiers, wherein the production of the modified urea resin is divided into three stages, namely a reaction initial stage, a reaction middle stage and a reaction later stage; adding the polyvinyl acetate emulsion and triethoxyisobutylsilane after polymerication at the later stage, stirring and mixing evenly and then adding the filler; due to the process, the gelation phenomenon in the polymerization process is avoided; the obtained urea resin is improved in water resistance and low in formaldehyde residue; if the urea resin is applied to producing an artificial board, the obtained artificial board can be applied to a high-humidity environment in the south, and is low in formaldehyde release amount.

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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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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