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Preparation method of phenolic resin

A phenolic resin and resin technology, applied in the field of preparation of phenolic resin, can solve the problems of increasing time and power consumption, and achieve the effect of saving preparation time

Inactive Publication Date: 2014-09-03
朱泳年 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And add two hours of time and power consumption, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 100kg of phenol, 45kg of 36.6wt% liquid formaldehyde and 0.5kg of NaOH into the reaction kettle, heat it, and slowly add 50kg of paraformaldehyde and 0.5kg of NaOH catalyst when the temperature in the kettle reaches 70°C. Heating, controlling the reaction temperature to 90°C for 4 hours and then ending the reaction, the solid content of the resin is above 76%, and the viscosity of the resin is above 1200mPa·s (25°C). After cooling, the finished product of phenolic resin is obtained.

Embodiment 2

[0022] Add 600kg of phenol and 36.6wt% liquid formaldehyde 270kg and 3kg of NaOH into the reaction kettle, heat it, and slowly add 280kg of paraformaldehyde and 3kg of NaOH catalyst when the temperature in the kettle reaches 75°C, and control the temperature in the kettle at 90 After 4 hours of reaction at ℃, the reaction ends, the solid content of the resin reaches more than 76%, and the resin viscosity is above 1200mPa·s (25℃). After cooling, the finished product of phenolic resin is obtained.

Embodiment 3

[0024] Add 800kg of phenol and 36.6wt% liquid formaldehyde 390kg and 4.5kg of NaOH into the reaction kettle, heat it, and when the temperature in the kettle reaches 80°C, slowly add 330kg of paraformaldehyde and 4.5kg of NaOH catalyst, and the temperature in the kettle is controlled at 90 After 4 hours of reaction at ℃, the reaction ends, the solid content of the resin reaches more than 76%, and the resin viscosity is above 1200mPa·s (25℃). After cooling, the finished product of phenolic resin is obtained.

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Abstract

The invention discloses a method for preparing a phenolic resin by using liquid formaldehyde, paraformaldehyde and phenol as raw materials. The method comprises the following steps of (1) proportioning the following raw materials in parts by weight: 1000 parts of phenol, 350-500 parts of 36-37wt% liquid formaldehyde, 400-550 parts of paraformaldehyde and 8-13 parts of NaOH catalyst, (2) putting phenol, liquid formaldehyde and sodium hydroxide into a reaction kettle and heating for reaction, (3) slowly adding the paraformaldehyde when the temperature in the kettle is up to 70-85 DEG C and reacting under the condition that the temperature in the kettle is controlled to be within a range of 70 DEG C to 95 DEG C, and (4) ending the reaction when the reaction system reaches the viscosity required by the resin and finally cooling. According to the method, water addition and dehydration are not required, the reaction is stable and mild, dangers are hardly caused, the environment is not polluted, and the time, labor and equipment are saved.

Description

technical field [0001] The invention relates to a method for preparing phenolic resin, in particular to a method for preparing phenolic resin by using liquid formaldehyde, paraformaldehyde and phenol as raw materials. Background technique [0002] The existing preparation of phenolic resin generally mostly adopts the reaction of phenol and liquid formaldehyde. A certain amount of water should be released during the preparation process. The extracted water generally contains more than 5% phenol and formaldehyde. General manufacturers can't handle it. resulting in serious environmental pollution. [0003] In recent years, some medium and large enterprises have used phenol and paraformaldehyde to prepare phenolic resin. However, in order to meet the requirement of liquid phenolic resin for moisture, a certain amount of water must be added when adding paraformaldehyde, and in the preparation process, the reaction is too intense, the reaction temperature is difficult to contr...

Claims

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Application Information

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IPC IPC(8): C08G8/10
Inventor 朱泳年朱泳利
Owner 朱泳年
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