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Refined purification method of high-quality phenol-formaldehyde resin for casting

A phenolic resin, refining and purification technology, applied in the direction of casting molding equipment, casting molds, manufacturing tools, etc., can solve problems such as endangering the health of on-site operators, condensation performance of phenolic resin, affecting product quality, etc., to improve product quality, improve The effect of mass transfer and small equipment size

Pending Publication Date: 2018-08-24
圣戈莱(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current synthesis process of phenolic resin for casting, the product still contains relatively high content of free phenol and free aldehyde monomers. These "impurities" seriously affect the quality of the product and have a strong odor during use, and also endanger the site. Physical health of operating workers
It is difficult to remove free phenol and free aldehyde monomers from the phenolic resin by conventional distillation methods; in addition, the conventional distillation method operates at a higher temperature, which will cause further condensation of the phenolic resin and change its properties

Method used

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  • Refined purification method of high-quality phenol-formaldehyde resin for casting

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Effect test

Embodiment approach 1

[0017] Embodiment 1: Process for synthesis of thermoplastic phenolic resin by acid catalysis

[0018] Add phenolic substances such as phenol and acid catalysts such as oxalic acid at one time according to the metering, and start to heat up after stirring for 2-5 minutes. Liquid formaldehyde with a concentration of 37%, after adding, keep it warm for 1-4 hours. After the reaction, start normal pressure and vacuum dehydration. When the vacuum reaches -0.1Mpa and the temperature reaches 100-180°C, add the reaction product continuously to the molecule In the still, the pressure inside the molecular still is -0.1Mpa, and the temperature is 120-220°C. After the material is added, the high-purity phenolic resin product is collected with a collection bottle.

Embodiment approach 2

[0019] Embodiment 2: Alkali-catalyzed synthesis of thermosetting phenolic resin

[0020] Add phenolic substances such as phenol and alkali catalysts such as triethylamine at one time according to the metering, and start to heat up after stirring for 2-5 minutes. When the temperature reaches 70-95°C, add all the metered aldehydes continuously within 2-3 hours. Substances such as liquid formaldehyde with a concentration of 37%, after the addition, keep warm for 1-4 hours, then add acid substances such as sulfuric acid to the reactant to adjust the pH value to neutral, and start vacuum dehydration after the reaction ends. When the vacuum degree reaches -0.1 Mpa, after the temperature reaches 70-100°C, the reaction product is continuously added to the molecular still, the pressure inside the molecular still is -0.1Mpa, and the temperature is 100-160°C. After the material is added, the high-purity phenolic resin product is collected with a collection bottle.

Embodiment approach 3

[0021] Embodiment 3: Metal salt catalyzed synthesis of high ortho phenolic resin process

[0022] According to the metered one-time input of phenolic substances such as phenol, aldehydes such as paraformaldehyde of 92% purity, alcohols such as butanol, and metal salt catalysts such as zinc acetate, start to heat up after stirring for 2-5 minutes, when the temperature reaches Insulate and react for 1-5 hours at 70-100°C. After the reaction is over, start normal pressure and vacuum dehydration. When the vacuum degree reaches -0.1Mpa and the temperature reaches 110-140°C, the reaction product is continuously added to the molecular still. The internal pressure is -0.1Mpa, and the temperature is 130-180°C. After the material is added, the high-purity phenolic resin product is collected with a collection bottle.

[0023] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only for the present inve...

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Abstract

The invention discloses a refined purification method of high-quality phenol-formaldehyde resin for casting, and particularly provides a refined purification method of phenolic resin which contains free phenol with content of 0.01% or lower, is quite high in purity and free of peculiar smell in a using process. According to the method, metered phenol compounds, aldehyde compounds and a catalyst are added to a reaction kettle and subjected to an acid catalyzed reaction, a base-catalyzed reaction and a metal salt catalyzed reaction under certain technological conditions, and thermoplastic phenol-formaldehyde resin, thermosetting phenol-formaldehyde resin and high-ortho phenol-formaldehyde resin are obtained respectively. After a polymerization reaction is finished, normal-pressure or vacuumdewatering is performed, refined purification treatment is performed with a molecular distillation technology finally, and the phenol-formaldehyde resin with quite low free phenol and free formaldehyde content is prepared. The method adopts a simple process, is good in repeatability and high in energy efficiency, required equipment size is small, mass transfer and heat transfer efficiency can be effectively improved, besides, product quality can be substantially improved, and the method is particularly suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a method for refining and purifying a phenolic resin for casting, in particular to a method for refining and purifying a phenolic resin whose free phenol content is less than 0.01% and has extremely high purity and no peculiar smell during use. Background technique [0002] Phenolic resin is made by polycondensation reaction of phenols and aldehydes under the action of acid or alkaline catalyst. In the current synthesis process of phenolic resin for casting, the product still contains relatively high content of free phenol and free aldehyde monomers. These "impurities" seriously affect the quality of the product and have a strong odor during use, and also endanger the site. The health of operating workers. It is difficult to remove free phenol and free aldehyde monomers from phenolic resins by conventional distillation methods; in addition, conventional distillation methods operate at high temperatures, which will lead to furt...

Claims

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Application Information

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IPC IPC(8): C08G8/10B22C1/22
CPCC08G8/10B22C1/2253
Inventor 位欢欢其他发明人请求不公开姓名
Owner 圣戈莱(北京)科技有限公司
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