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Process for producing phenolic resin by secondary throwing method

A phenolic resin and process technology, applied in the field of phenolic resin production methods, can solve problems such as difficult control, phenolic resin application and reprocessing obstacles, phenolic resin performance instability, etc., to achieve concentration reduction, stability improvement, and solution stability problem effect

Inactive Publication Date: 2006-08-16
覃强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional phenolic resin synthesis method uses phenol, formaldehyde, catalyst, etc. to be put into the reaction equipment in a certain proportion at one time, and then synthesized according to a certain process. The molecular weight distribution of the phenolic resin produced by the reaction is relatively wide, which is difficult to control. Unstable performance, which hinders the application and reprocessing of phenolic resins

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1), in the reactor that agitator, condenser, vacuum system, temperature control measuring device are housed, drop into 500 grams of purity and be 99% phenol, 1 gram of cashew nut shell oil, 0.6 gram of tung oil, 498 gram of formaldehyde and 2 gram of sodium hydroxide, stop heating when the temperature rises to 60°C, control the heating rate of 1°C per minute, after reaching 80°C, control the heating rate of the material to about 1°C per 1.5 minutes, and count when the temperature reaches 80°C, and last for 20 minutes;

[0014] (2) After 20 minutes, add the remaining 203 grams of formaldehyde and 2 grams of sodium hydroxide, and raise the temperature to 100 ° C ~ 103 ° C at a heating rate of 1 ° C per minute for 55 minutes;

[0015] (3), after 55 minutes, find the emulsification point at 40°C, start dehydration, cool to 60°C after dehydration is complete, add 20 grams of urea, and when the temperature is lowered to below 50°C, the finished product phenolic resin is obtai...

Embodiment 2

[0017] (1), in the reactor that stirrer, condenser, vacuum system, temperature control measuring device are housed, drop into 500 grams of pretreated phenol, 1 gram of cashew nut shell oil, 0.6 gram of tung oil, 515 gram of formaldehyde and hydrogenation Sodium 2.2 grams, heating reaction to 60 ° C to stop heating, control the heating rate of 1 ° C per minute, after reaching 80 ° C, control the heating rate of the material to be about 1 ° C every 1.5 minutes, when the temperature reaches 80 ° C, count and continue for 20 minutes. The pretreatment of the above-mentioned pretreated phenol is carried out with a purity of 99% phenol and resorcinol or o-cresol or p-cresol or hydroquinone in an amount of 0.2% to 10% of the phenol weight. mixed treatment.

[0018] (2) After 20 minutes, add the remaining 196 grams of formaldehyde and 1.8 grams of sodium hydroxide, and raise the temperature to 100 ° C ~ 103 ° C at a heating rate of 1 ° C per minute for 63 minutes;

[0019] (3), after ...

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PUM

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Abstract

Production of phenolic resin by second-inputting method has centralized molecular weight distribution peak, lower active-base concentration and is stable. The phenolic resin consists of phenic acid 495~505, oil of cashew nut shell 0.7~1.5, tung oil 0.4~1, formaldehyde 710~730, sodium hydrate 1.6~1.8 and urea 18~22. The process is carried out by putting phenic acid, oil of cashew nut shell, tung oil and 70~75% formaldehyde and 50~55% sodium hydrate into reactive kettle, heating, putting the residual phenic acid and sodium hydrate into reactive kettle, heating, inspecting to milk cloud point at 40~42 degrees C while dewatering, lowering temperature, adding into urea and lowering temperature continuously to obtain final product.

Description

technical field [0001] The invention relates to a production method of a phenolic resin with phenol and formaldehyde as main raw materials, and belongs to the technical field of macromolecular organic compounds. Background technique [0002] Phenolic resins in the prior art have good acid resistance, alkali resistance, heat resistance and electrical insulation, and are widely used in the fields of telecommunications, electrical appliances, instruments, daily necessities, and lightweight building materials. However, the traditional phenolic resin synthesis method uses phenol, formaldehyde, catalyst, etc. to be put into the reaction equipment in a certain proportion at one time, and then synthesized according to a certain process. The molecular weight distribution of the phenolic resin produced by the reaction is relatively wide, which is difficult to control. Unstable performance hinders the application and reprocessing of phenolic resins. Contents of the invention [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/32C08G8/10
Inventor 谢建军覃强
Owner 覃强
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