Environment-friendly urea resin adhesive and preparation method thereof

An environmentally friendly, urea-formaldehyde resin technology, applied in adhesives, aldehyde/ketone condensation polymer adhesives, starch adhesives, etc., can solve the problems of excessive formaldehyde content, endangering human health, polluting the environment, etc., and achieve stable storage Long-term, easy to operate and control, simple production process

Inactive Publication Date: 2012-12-26
HUBEI HONGYUAN PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of formaldehyde, methylol and hemiacetal in urea-formaldehyde resin due to the equilibrium reaction, its free formaldehyde will be slowly released from the wood-based panels, causing the indoor formaldehyde content to exceed the standard for a long time, which not only pollutes the environment, but also seriously endangers human health.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] An environment-friendly urea-formaldehyde resin adhesive is prepared from the following raw materials: 30 parts of urea, 67 parts of glyoxal, 1 part of melamine, 0.5 part of cornstarch and 1.5 parts of borax.

[0017] The preparation method is:

[0018] (1) Take 30Kg of urea, 67Kg of glyoxal, 1Kg of melamine, and 0.5Kg of cornstarch into the reaction kettle in turn, stir, heat the temperature of the reaction system to 80°C, and condense and reflux for 1.5h;

[0019] (2) Add 1.5 parts of borax to the reaction system of step (1), then adjust the pH value of the system with NaOH to be 5.0, cool and discharge, and obtain the viscous liquid of light yellow and non-irritating smell, which is the environmentally friendly preparation Type urea-formaldehyde resin adhesive.

Embodiment 2

[0021] An environment-friendly urea-formaldehyde resin adhesive is prepared from the following raw materials: 35 parts of urea, 62 parts of glyoxal, 0.6 part of melamine, 0.9 part of cornstarch and 1.5 parts of borax.

[0022] The preparation method is:

[0023] (1) Add urea 35Kg, glyoxal 62Kg and melamine 0.6Kg cornstarch 0.9Kg into the reaction kettle in turn, stir, heat the temperature of the reaction system to 55°C, condense and reflux for 3.5h;

[0024] (2) Add 1.5Kg of borax to the reaction system of step (1), then adjust the pH of the system with KOH to be 7.0, cool and discharge the material, and obtain the viscous liquid of light yellow, non-irritating smell, which is the environmentally friendly preparation Type urea-formaldehyde resin adhesive.

Embodiment 3

[0026] An environment-friendly urea-formaldehyde resin adhesive is prepared from the following raw materials: 38 parts of urea, 58 parts of glyoxal, 1.5 parts of melamine, 2 parts of cornstarch and 1 part of borax.

[0027] The preparation method is:

[0028] (1) Add 38Kg of urea, 58Kg of glyoxal, 1.5Kg of melamine, and 2Kg of cornstarch into the reaction kettle in sequence, stir, heat the temperature of the reaction system to 70°C, and condense and reflux for 3 hours;

[0029] (2) add borax 1Kg in step (1) reaction system, regulate this system pH value with ammoniacal liquor then and be 5.5, cooling discharge, obtain the viscous liquid of light yellow, non-irritating smell and be the environment-friendly type of preparation Urea-formaldehyde resin adhesive.

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PUM

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Abstract

The invention discloses an environment-friendly urea resin adhesive, prepared from the following components in parts by weight: 30-38 parts of urea, 58-67 parts of oxalaldehyde, 0.5-2 parts of corn starch, 0.5-1.5 parts of borax, 0.6-2 parts of tripolycyanamide. The invention also discloses a preparation method of the environment-friendly urea resin adhesive. The environment-friendly urea resin adhesive prepared by the invention contains no formaldehyde and no irritant smell, is beneficial to human health and environmental protection and has the characteristics of long stable storage period and simple production process.

Description

technical field [0001] The invention relates to a urea-formaldehyde resin adhesive, in particular to an environment-friendly urea-formaldehyde resin adhesive and a preparation method thereof. Background technique [0002] Ordinary urea-formaldehyde resin is a thermosetting adhesive formed by polycondensation of urea and formaldehyde under catalyzed (alkali-catalyzed or acid-catalyzed) conditions. Urea-formaldehyde resin has many advantages such as high bonding strength, fast curing rate, and can be mixed with water, easy to manufacture, etc. It is widely used in the wood-based panel and wood processing industry, accounting for about 80% of the adhesive usage in this industry, and showing continuous growth momentum. However, due to the existence of formaldehyde, methylol and hemiacetal in urea-formaldehyde resin due to the equilibrium reaction, its free formaldehyde will be slowly released from the wood-based panels, causing the indoor formaldehyde content to exceed the stan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/30C09J103/02C09J11/04C08G12/38
Inventor 吕智国
Owner HUBEI HONGYUAN PHARMA
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