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[Chemical Knowledge]：Manufacturing method and process flow of polysulfone resin

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The manufacturing method
of polysulfone resin
1. Introduction

Polysulfone resin is a high-performance engineering plastic with excellent heat resistance, chemical resistance, mechanical strength and electrical insulation properties. It is widely used in chemical industry, Electronics, machinery, automobiles, aerospace and other fields. This article will introduce the manufacturing method of polysulfone resin, including raw material preparation, polymerization reaction, post-treatment and other steps.

2. Raw Material Preparation

1. Bisphenol A: Bisphenol A is the main raw material for the preparation of polysulfone resin, which should have high purity, generally requiring purity above 99%.
2. 4,4 '-dichlorodiphenyl sulfone: 4,4'-dichlorodiphenyl sulfone is another important raw material for preparing polysulfone resin, which also requires high purity.

3. polymerization

polysulfone resins are generally prepared by solution polymerization, with bisphenol A and 4,4 '-dichlorodiphenyl sulfone as raw materials, nucleophilic substitution reaction in polar solvents. The specific steps are as follows:

1. bisphenol A and a polar solvent are added into a reactor and heated to a certain temperature to form a bisphenol A solution.
2. Under the condition of stirring, 4,4 '-dichlorodiphenyl sulfone solution is slowly added dropwise, and the dropping speed is controlled to keep the reaction temperature stable.
3. Continue stirring and heating to complete the reaction.

4. Post-treatment

1. Desolvation: After the reaction is completed, the reaction solution is poured into a distillation kettle, and the solvent is distilled off to obtain a crude polysulfone resin.
2. Washing: The crude polysulfone resin was washed with hot water to remove residual solvent and by-products.
3. Drying: The washed crude polysulfone resin is dried to obtain a finished polysulfone resin.

5. Precautions

1. Strictly control the purity and dropping speed of raw materials to avoid side reactions.
2. The temperature should be kept stable during the reaction to avoid local overheating leading to product quality degradation.
3. The washing and drying conditions should be controlled during the post-treatment process to avoid the product performance being affected.

6. Conclusion The manufacturing method of

polysulfone resin includes the steps of raw material preparation, polymerization reaction and post-treatment, and the polymerization reaction is the key link. By strictly controlling the purity of raw materials, reaction temperature and post-treatment conditions, high-performance polysulfone resin products can be produced.

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