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[Chemical Knowledge]：Manufacturing method and process flow of phenolic resin for electronic insulation and composite materials

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Manufacturing methods
of phenolic resins for electronic insulation and composite materials
1. Introduction

phenolic resins are widely used in the fields of electronic insulation and composite materials due to their excellent thermal stability, electrical insulation, chemical resistance and mechanical properties. This article will detail the manufacturing methods of phenolic resins for electronic insulation and composite materials.

2. raw materials and equipment

1. raw materials: phenols (such as phenol, cresol, etc.), formaldehyde, catalyst (such as hydrochloric acid, sulfuric acid, etc.), inhibitor (such as hydroquinone, etc.).
2. Equipment: reaction kettle, stirrer, thermometer, pH meter, condenser, vacuum pump, etc.

3. Manufacturing Methods

1. The molar ratio of phenol to formaldehyde is generally between 1:1 and 1:3, adjusted according to the desired properties of the phenolic resin. The phenol and formaldehyde were added to the reactor separately, and the stirrer was started.
2. Add catalyst, generally use hydrochloric acid or sulfuric acid, the amount of catalyst is generally 1%-5% of the total amount of phenols. The role of the catalyst is to accelerate the reaction of phenol with formaldehyde.
3. The reaction is started at an appropriate temperature, generally 70-90°C, and the reaction time is adjusted according to the desired molecular weight and properties of the phenolic resin, generally between 2-6 hours.
4. When the reaction proceeds to a certain extent, a polymerization inhibitor is added to prevent further reaction. Then the reaction solution was dehydrated in vacuum to obtain the initial product of phenolic resin.
5. Post-treatment of the primary product, such as grinding, sieving, etc., to obtain the required phenolic resin for electronic insulation and composite materials.
Precautions for
4.

1. Strictly control the quality and proportion of raw materials to ensure that the reaction produces the required phenolic resin.
2. The amount of catalyst and inhibitor should be appropriate, too much or too little will affect the reaction speed and product quality.
3. The reaction temperature and time should be adjusted according to the required performance of the phenolic resin to ensure the performance and quality of the product.
4. vacuum dehydration to control the vacuum degree and temperature, to avoid product decomposition or deterioration.

5. product quality standards

the product quality standards of phenolic resins for electronic insulation and composite materials should include the following: appearance (generally yellow or brown transparent solids), softening point, viscosity, free phenol content, free formaldehyde content, Thermal stability, etc. These indicators should be determined by the corresponding detection methods to ensure that the product quality meets the relevant standards and requirements.

6. Application Field

Phenolic resin for electronic insulation and composite materials is widely used in electronic equipment, electrical insulation, composite materials and other fields. It has excellent electrical insulation, heat resistance, chemical resistance and mechanical properties, which can improve the performance and service life of electronic equipment and composite materials.

7. environmental protection and safety

should strictly abide by environmental protection and safety regulations during the production process, reduce the discharge of waste gas, waste water, waste residue and other pollutants, and ensure the safety of employees and the environment. At the same time, comprehensive risk assessment and prevention and control should be carried out in the production process to avoid safety accidents caused by improper operation or equipment failure.

8. conclusion The manufacturing method of phenolic resin for

electronic insulation and composite materials involves many links and factors, and it is necessary to strictly control the quality of raw materials, reaction conditions, post-treatment and other key factors to ensure product quality and performance. At the same time, environmental protection and safety management should be strengthened to promote the sustainable development of phenolic resin manufacturing industry.

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