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

CN1974625AInactive Publication Date: 2007-06-06ZHEJIANG FORESTRY UNIVERSITY

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: ZHEJIANG FORESTRY UNIVERSITY
Publication Date: 2007-06-06
Estimated Expiration: Not applicable · inactive patent

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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.

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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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