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
CN1974624AInactive 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 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.
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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

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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