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Environment-friendly type urea-formaldehyde resin adhesive and production method thereof

A technology of urea-formaldehyde resin and production method, which is applied in the directions of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc. High strength, excellent water resistance, versatile effect

Inactive Publication Date: 2011-11-02
王喆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But the biggest disadvantage of UF adhesives is the high content of free formaldehyde, which not only pollutes the environment but also endangers people's health.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Take 175 grams of glyoxal with a content of 40% and place it in a 1000 ml three-neck flask, add 45 grams of urea and 15 grams of 10% polyvinyl alcohol 2088 solution under stirring, raise the temperature to 50°C to stop heating, and pass through the methyl alcohol in six times. Tetramine to adjust pH value 7.5~8.5 , and react for 40 minutes when the temperature is raised to 80~90°C. Then 15 grams of the remaining 25% urea was added, and the reaction was continued for 40 minutes, and then the pH was adjusted with formic acid to 5.5~6.5 And in 70~80 The end point is when a milky white thick liquid appears in the reaction at ℃ or when a drop of the reaction solution is added to a cup of water at 40 ℃ and stirred to form a cloud. Adjust the pH with NaOH to 7.0~8.0 , After cooling to below 40°C, it will be finished product after being packaged.

[0023] Relevant performance indicators of urea glyoxal resin adhesive:

[0024] Name Indicator

[0025] Appearance Brown-yell...

example 2

[0031] Take 200 grams of 40% glyoxal and place it in a 1000 ml three-necked bottle, add 54 grams of urea and 35 grams of 10% polyvinyl alcohol 2099 solution under stirring, stop heating after raising the temperature to 50 ° C, adjust with hexamethylenetetramine PH value 7.5~8.5 Then warm up to 80~90 ℃ for 40 minutes, the remaining 30% of urea 23 grams continued to add, after 40 minutes of reaction, use 1:1 hydrochloric acid to adjust the pH to 5.5~6.5 , and at 70~80 The end point is when a milky white thick liquid appears in the reaction at ℃ or when a drop of the reaction solution is added to a cup of 40 ℃ water and stirred to appear cloudy. Adjust the pH with sodium hydroxide to 7.0~8.0 , After cooling to below 40°C, it will be the finished product after being packaged.

[0032] The method of use and relevant technical parameters are the same as those of the previous photobook, so they are omitted.

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PUM

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Abstract

An environment-friendly type urea-formaldehyde resin adhesive and a production method thereof. The method comprises the following steps: mixing glyoxal with urea in a container according to a certain mol ratio; adding a 10% polyvinyl alcoholic solution prepared in advance and urea under agitation, adjusting the pH value of the solution to be 7.5 to 8.5, and heating the solution to a temperature of 80 to 90 DEG C for reaction; adding a proper amount of urea for reaction for 40 minutes, adjusting the pH value of the solution to be 5 to 6, subjecting the solution to reaction at a temperature of 70 to 80 DEG C, and stopping the reaction when opacified sticky liquid appears or when cloudy sticky liquid appears under the condition that a droplet of the reaction solution is added into a glass with water at a temperature of 40 DEG C; cooling the solution to a temperature less than 40 DEG C and packaging the discharged products so as to obtain finished products. The adhesive provided in the invention belongs to excellent environment-friendly decoration materials, has remarkable adhesive properties, little smell, great initial adhesion, high final strength, good endurance and appropriate viscosity, is easy to paint and stable to store, and enables a glue film to be tough and tensile. Woodwork glued by the adhesive has no obvious glue lines, has excellent water tolerance, and produces no cracking in long-term usage.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to an environment-friendly urea-formaldehyde resin adhesive and a production method thereof. It is mainly used for bonding woodworking furniture, various wood-based panels, glulam processing, advanced solid wood composite floor bonding, decoration and many other aspects, and has a wide range of applications. Background technique [0002] With the rapid development of my country's wood industry, it has become the world's largest wood-based panel production country. At present, most of the glue used in the domestic wood industry uses urea-formaldehyde glue, phenolic glue, melamine-formaldehyde glue and polyvinyl acetate glue. Their bonding strength is poor, the bonding surface is hard, brittle, non-tough, not waterproof, not durable, etc., and they are also poisonous. Pollution environment, hot eyes and pungent smell. Among all kinds of adhesives, urea-formaldehyde resin adhesives...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/32C08G12/40
Inventor 王喆王越王学谦
Owner 王喆
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