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Melamine and urea modified phenolic resin and its production process

A technology of melamine and phenolic resin, applied in the field of melamine, urea-modified phenolic resin and its production, can solve the problems affecting the resin bonding strength, stability, storage period, insufficient copolycondensation reaction, poor wear resistance, fire resistance, etc. problem, to achieve the effect of good fire resistance, low cost and high bonding strength

Inactive Publication Date: 2007-06-06
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The applicant believes that it is debatable how to provide more suitable reaction conditions to make the co-condensation reaction of urea, melamine, formaldehyde and phenol more sufficient, so as to obtain a compound with higher viscosity, better stability and longer storage period. , wear-resistant, fire-resistant glue, from the analysis of the chemical reaction mechanism, the method introduced in the above two articles, the co-condensation reaction is not sufficient, which affects the potential performance of the resin bonding strength, stability, storage period, etc.
In addition, none of the above two comparison schemes involved melamine in the reaction, and the wear resistance and fire resistance were poor.

Method used

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  • Melamine and urea modified phenolic resin and its production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1 (referring to serial number and the proportioning figure of parts by weight in the table):

[0011] First melt 40 parts of phenol (P) in the reactor, add 60 parts of formaldehyde (F), 15 parts of urea (U), and 32 parts of melamine (M), adjust the pH to 6-8, and raise the temperature to 75-100°C. Insulate for 30-100 minutes, then use ammonium chloride to adjust PH=3.0-5.5, and carry out co-condensation reaction. When the viscosity is ≥20S (20°C, apply 4 cups), use NaoH to adjust PH=7.5-12.0, do not add water, and control the temperature 80-95°C, heat preservation reaction to the end, cooling and discharging.

Embodiment 2

[0013] Melt 25 parts of P in the reactor, then add 5 parts of U, 5 parts of M, 12 parts of F, and 25 parts of water, and obtain the resin in the same way as in Example 1.

[0014] Embodiment 3 and 4 are all according to the proportioning in the table, and the method with reference to embodiment 1, 2 makes this resin. Examples 1-4, molar ratio F: (P+U+M)≤1.3, F added at one time.

Embodiment 5

[0016] Melt P50 parts in the reactor, then add U15 parts, M15 parts, design the total amount of F to be 200 parts, add F95 parts for the first time, adjust the pH to 6-8, raise the temperature to 75-100°C, and keep warm for 30-100min , use hydrochloric acid to adjust PH=3.0-5.5, carry out co-condensation reaction, when the viscosity is ≥20S (20°C, apply 4 cups), use Naco 3 , adjust the pH to 7.5-12.0, add 100 parts of water, add the remaining F105 parts twice, control the temperature at 80-95 ° C, keep warm until the end of the reaction, and cool and discharge.

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Abstract

The present invention is melamine and urea modified resin and its production process. The material includes urea in 5-50 weight portions, melamine in 5-50 weight portions, phenol in 25-50 weight portions, formaldehyde in 12-300 weight portions and water in 0-250 weight portions. The production process includes the following steps: smelting phenol in the reaction kettle, adding formaldehyde, urea and melamine, regulating pH to 6-8, heating to 75-100 deg.c, maintaining for 30-100min, regulating pH to 3.0-5.5 for condensation reaction at viscosity not lower than 20S, regulating pH to 7.5-12, adding water and formaldehyde optionally, controlling temperature in 80-95 deg.c to react to terminal. The melamine and urea modified resin is yellow or brown transparent colloid liquid with pH 7.5-12, free phenol in 0.5-10 %, free aldehyde less than 2.0 %, and solid content 30-75 % and storage life over 1 month. It is used as adhesive for timber, friction plate, etc.

Description

technical field [0001] The invention relates to a resin prepared by co-condensation reaction using urea, phenol, melamine and formaldehyde as raw materials and a production method thereof. Background technique [0002] Among today's wood adhesives, phenolic resin and urea-formaldehyde resin are widely used. Phenolic resin has strong durability and is widely used in structural fields and open-air environments; while urea-formaldehyde resin is low in cost and widely used indoors. How to organically combine the advantages of the two adhesives to develop a new adhesive with high performance, wear resistance, fire resistance and low cost has become a goal for those who are willing to work hard. "Forestry Science" Volume 36, Issue 5 published the article "Synthesis and Analysis of Phenol-Urea-Formaldehyde Co-condensation Resin Development I" by Mr. Du Guanben from Southwest Forestry College, and "Journal of Fujian Forestry College" published Volume 25 of Fujian Associate Professo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C08G12/38
Inventor 傅深渊
Owner ZHEJIANG FORESTRY UNIVERSITY
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