Manufacturing Method of Phenolic Resin for Electronic Insulation and Composite Materials
I. INTRODUCTION
Phenolic resins are widely used in the field of electronic insulation and composite materials due to their excellent thermal stability, electrical insulation, chemical resistance and mechanical properties. In this paper, the manufacturing method of phenolic resin for electronic insulation and composite materials will be introduced in detail.
II. Raw materials and equipment
1. Raw materials: phenol (such as phenol, cresol, etc.), formaldehyde, catalyst (such as hydrochloric acid, sulfuric acid, etc.), polymerization inhibitor (such as hydroquinone, etc.).
2. Equipment: reactor, stirrer, thermometer, pH meter, condenser, vacuum pump, etc.
3. Manufacturing method
1. The molar ratio of phenol to formaldehyde is generally between 1:1 and 1:3, which is adjusted according to the performance of the desired phenolic resin. Add the phenol and formaldehyde into the reactor separately and turn on the stirrer.
2. Add catalyst, usually hydrochloric acid or sulfuric acid is used, the amount of catalyst is usually 1%-5% of the total amount of phenol. The function of the catalyst is to accelerate the reaction between phenol and formaldehyde.
3. Start the reaction at an appropriate temperature, the reaction temperature is generally at 70-90°C. The reaction time is adjusted according to the molecular weight and properties of the desired phenolic resin, generally between 2-6 hours.
4. When the reaction has proceeded to a certain extent, a polymerization blocking agent is added to prevent the reaction from proceeding further. The reaction solution is then vacuum dehydrated to obtain the preliminary product of phenolic resin.
5. The preliminary product is subjected to post-processing, such as grinding and sieving, to obtain the desired phenolic resin for electronic insulation and composite materials.
4. Precautions
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 polymerization 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 performance of the required phenolic resin to ensure the performance and quality of the product.
4. Vacuum dehydration should control the vacuum degree and temperature to avoid decomposition or deterioration of the product.
V. Product quality standards
The product quality standards of phenolic resin for electronic insulation and composite materials should include the following: appearance (generally yellow or brown transparent solid), softening point, viscosity, free phenol content, free formaldehyde content, thermal stability and so on. These indicators should be measured by the appropriate testing methods to ensure that product quality in line with relevant standards and requirements.
Six, application areas
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.
VII. Environmental protection and safety
In the production process, environmental protection and safety regulations should be strictly observed to reduce the emission of pollutants such as waste gas, waste water, waste residue, etc., and ensure the safety of employees and the environment. At the same time, the production process should be subject to comprehensive risk assessment and prevention and control to avoid safety accidents caused by improper operation or equipment failure.
VIII.CONCLUSION
The manufacturing method of phenolic resin for electronic insulation and composites involves a number of links and factors, and it is necessary to strictly control the quality of raw materials, reaction conditions, post-processing 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.
