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Urea-phenol-formaldehyde co-condensation polymer resin and its production process

A technology of co-condensation resin and phenol-formaldehyde, which is applied in the field of urea-phenol-formaldehyde co-condensation resin and its production, can solve the problems affecting resin bonding strength, stability, storage period, and insufficient co-condensation reaction, etc., and achieve cost Low, high bonding strength, sufficient co-condensation reaction effect

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 questionable how to provide more suitable reaction conditions to make the co-condensation reaction of urea, formaldehyde and phenol more sufficient, so as to obtain a glue with higher viscosity, better stability and longer shelf life. In this regard, there should be a variety of methods. From the analysis of the chemical reaction mechanism, the methods 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.

Method used

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  • Urea-phenol-formaldehyde co-condensation polymer resin and its production process

Examples

Experimental program
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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), 30 parts of urea (U), without adding water, adjust the pH to 6-8, raise the temperature to 75-100°C, and keep it warm for 30-100min , and 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, control the temperature at 80-95°C, and keep warm for the reaction To the end, cooling and discharging.

Embodiment 2

[0013] Melt 25 parts of P in the reactor, then add 5 parts of U, 12 parts of F, and 25 parts of water, and obtain this 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. Embodiment 1-4, molar ratio F: (P+U)≤1.3, F adds once.

Embodiment 5

[0016] Melt 30 parts of P in the reactor, then add 20 parts of U, design the total amount of F to be 150 parts, add 68 parts of F for the first time, adjust the pH to 6-8, raise the temperature to 75-100°C, keep it warm for 30-100min, and use hydrochloric acid 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 F82 parts twice, control the temperature at 80-95°C, keep the reaction until the end, and cool and discharge.

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Abstract

The present invention is urea-phenol-formaldehyde condensation polymer resin and its production process. The material includes urea in 5-50 weight portions, phenol in 25-50 weight portions, formaldehyde in 12-225 weight portions and water in 0-250 weight portions. The production process includes the following steps: smelting phenol in the reaction kettle, adding urea and formaldehyde, 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 urea-phenol-formaldehyde condensation polymer 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 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 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 Professor Lin Qiaojia of Agriculture and Forestry Un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/10C08G8/30C08G12/36
Inventor 傅深渊
Owner ZHEJIANG FORESTRY UNIVERSITY
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