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Modified urea-formaldehyde resin adhesive and production method thereof

A technology of urea-formaldehyde resin glue and urea-formaldehyde resin, applied in adhesives, adhesive additives, aldehyde/ketone condensation polymer adhesives, etc., can solve problems such as low degree of polymerization, imbalance of monomer ratio, failure to polymerize and supplement monomers, etc.

Active Publication Date: 2013-12-18
广西横州丽冠环保材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a phenomenon in the polymerization reaction, called the gel phenomenon. The reason is that due to the high monomer concentration in the early stage of the polymerization reaction, the polymerization reaction is violent, the molecular weight of the polymer increases sharply, and the viscosity of the polymerization solution also increases sharply. The polymer is wrapped, and the wrapped monomer can also undergo polymerization reaction, but because the external polymerized monomer is difficult to diffuse to the inside, the polymerization reaction cannot be supplemented with monomer, resulting in a low degree of polymerization and an imbalance in the proportion of monomers, resulting in a monomer residue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The production method of modified urea-formaldehyde resin:

[0021] (1) Pre-polymerization stage: Add formaldehyde solution to the polymerization reactor at one time, adjust the pH value to 2 with formic acid, add polyvinyl alcohol with 0.5% weight of formaldehyde solution, add urea with 8% weight of formaldehyde solution, and heat up to 50°C. Insulation reaction for 30min;

[0022] (2) Middle stage of polymerization reaction: at the end of the pre-polymerization stage, add alkali to adjust the pH value of the reaction solution to 8, add urea with 22% weight of formaldehyde solution, and finish adding within 40-60 minutes, then add melamine with 1% weight of formaldehyde solution, Raise the temperature of the reaction solution to 90-95°C, and keep it warm for 90 minutes;

[0023] (3) Later stage of polymerization reaction: after the polymerization stage is over, add urea with 45% weight of formaldehyde solution, and finish adding within 40-60 minutes, then add melamine...

Embodiment 2

[0025] The production method of modified urea-formaldehyde resin:

[0026] (1) Pre-polymerization stage: add formaldehyde solution to the polymerization reactor at one time, adjust the pH value to 2.2 with formic acid, add polyvinyl alcohol with 0.55% of the weight of the formaldehyde solution, add urea with 10% of the weight of the formaldehyde solution, and heat up to 50°C. Insulation reaction for 30min;

[0027] (2) Middle stage of polymerization reaction: at the end of the pre-polymerization stage, add alkali to adjust the pH value of the reaction solution to 8.3, add urea with 25% weight of formaldehyde solution, finish adding within 40-60 minutes, then add melamine with 1% weight of formaldehyde solution, Raise the temperature of the reaction solution to 90-95°C, and keep it warm for 90 minutes;

[0028] (3) Late stage of polymerization reaction: after the polymerization stage is over, add urea with 40% weight of formaldehyde solution and finish adding within 40-60 minu...

Embodiment 3

[0030] The production method of modified urea-formaldehyde resin:

[0031] (1) Pre-polymerization stage: add formaldehyde solution to the polymerization reactor at one time, adjust the pH value to 2-2.5 with formic acid, add polyvinyl alcohol with 0.6% weight of formaldehyde solution, add urea with 12% weight of formaldehyde solution, and heat up to 50 ℃, keep warm for 30 minutes;

[0032] (2) Middle stage of polymerization reaction: at the end of the pre-polymerization stage, add alkali to adjust the pH value of the reaction solution to 8-8.5, add 20% urea by weight of formaldehyde solution, finish adding within 40-60 minutes, and then add 1% by weight of formaldehyde solution For melamine, heat up the reaction solution to 90-95°C, and keep it warm for 90 minutes;

[0033] (3) Later stage of polymerization reaction: at the end of the polymerization stage, add urea with 50% weight of formaldehyde solution and finish adding within 40-60 minutes, then add melamine with 2.0-2.5%...

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Abstract

The invention provides a modified urea-formaldehyde resin adhesive low in formaldehyde residue and a production method thereof. The modified urea-formaldehyde resin adhesive is characterized by being prepared from the following raw materials in parts by weight: 100 parts of modified urea-formaldehyde resin, 20-25 parts of reinforcing agent and 0.1-0.2 part of defoamer, wherein the reinforcing agent is any one or a composition of several of white carbon black, titanium dioxide, calcium carbonate and kaolin having the particle size greater than 300 meshes; the defoamer is polydimethylsiloxane or tributyl phosphate. The formaldehyde residue of the modified urea-formaldehyde resin adhesive provided by the invention is less than 0.1 mg / L; the modified urea-formaldehyde resin adhesive is used as an adhesive for an artificial board; as the modified urea-formaldehyde resin adhesive is low in release amount of formaldehyde, the health of customers is protected.

Description

technical field [0001] The invention relates to a modified urea-formaldehyde resin adhesive, in particular to a low formaldehyde residual polyvinyl alcohol and melamine modified urea-formaldehyde resin adhesive. Background technique [0002] Wood-based panels are boards or molded products made of wood or other non-wood plants as raw materials, separated into various unit materials by certain mechanical processing, and then glued with adhesives and other additives. The most commonly used adhesive for wood-based panels is urea-formaldehyde resin or modified urea-formaldehyde resin. The production process of urea-formaldehyde resin is simple and low in cost, but its water resistance and strength are low. Urea-formaldehyde resin modified by melamine, phenol or resorcinol, acrylate copolymer, isocyanate, polyvinyl alcohol or lignin significantly improves water resistance properties and bond strength. One of the raw materials for the production of urea-formaldehyde resin or modi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/32C09J11/04C09J11/06C09J11/08C08G12/40
Inventor 肖文飞王飞虎邱金城农志军李同雨欧阳先明谢高专
Owner 广西横州丽冠环保材料有限公司
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