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[Chemical Knowledge]：Manufacturing method and process of polyester diaphragm

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The manufacturing method
of polyester diaphragm
1. Introduction

polyester diaphragm is a polymer material widely used in chemical industry, electronics, food packaging and other fields. It has excellent mechanical properties, thermal stability, electrical insulation and resistance Chemical corrosion and other characteristics. This article will introduce the manufacturing method of polyester diaphragm, including raw material preparation, polymerization reaction, melt extrusion, two-way stretching, heat treatment and winding steps.

2. raw material preparation

polyester diaphragm main raw material is terephthalic acid and ethylene glycol. First of all, the two raw materials need to be mixed together according to a certain molar ratio, and then auxiliary materials such as catalyst and stabilizer are added, stirred evenly and sent into the polymerization reactor.

3. polymerization

In a polymerization reactor, the raw materials undergo esterification and polycondensation reactions under high temperature and high pressure conditions to generate polyester polymers. This process needs to control the reaction temperature and pressure to ensure the smooth progress of the reaction and the quality of the product.

4. Melt Extrusion

After the completion of the polymerization reaction, the polyester polymer melt obtained is extruded through an extruder head to form a sheet with a certain thickness. During the extrusion process, the temperature, pressure and flow rate of the melt need to be controlled to ensure the uniformity and surface finish of the sheet.

5. biaxial stretching
The
extruded sheet is subjected to longitudinal and transverse stretching by a biaxial stretching machine to increase its strength and toughness. During the stretching process, it is necessary to control the stretching ratio and stretching speed to ensure the mechanical properties and service life of the sheet.

6. heat treatment

biaxially stretched sheet requires heat treatment to relieve internal stress and improve dimensional stability. It is necessary to control the temperature and time during the heat treatment process to ensure the performance and quality of the sheet. The heat-treated sheet is wound

a
7. winding
to obtain the final polyester film product. Tension and speed need to be controlled during the winding process to ensure the quality and appearance of the product.

8. Quality Control and Testing

In the production process, quality control and testing of raw materials, semi-finished products and finished products are required to ensure that the quality of the products meets relevant standards and requirements. The test items include physical properties, chemical properties, appearance quality, etc.

9. environmental protection and safety production

The production process of polyester diaphragm needs to pay attention to environmental protection and safety production. It is necessary to take effective measures to reduce the discharge of waste gas, waste water and solid waste, reduce energy consumption and resource consumption, and improve production efficiency and economic benefits. At the same time, it is necessary to strengthen equipment maintenance and operation management to prevent safety accidents.

10. Conclusion The manufacturing method of

polyester film includes the steps of raw material preparation, polymerization reaction, melt extrusion, two-way stretching, heat treatment and winding. In the production process, attention should be paid to quality control and testing, environmental protection and safety in production. By mastering the appropriate manufacturing methods and control technology, we can produce high-quality, high-performance polyester diaphragm products to meet the application needs of different fields.

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