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Preparation method of polyphenylene sulfide

The technology of polyphenylene sulfide and polymerization kettle is applied in the field of preparation of polyphenylene sulfide, which can solve the problems of low molecular weight polymer, influence the stability of polyphenylene sulfide resin, and many inorganic impurities, and achieves the concentration of molecular weight distribution range, To achieve automatic operation, high purity effect

Pending Publication Date: 2021-02-02
长治市霍家工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the defects in the prior art that when producing polyphenylene sulfide, many inorganic impurities are introduced and a large amount of low-molecular polymers exist, thereby affecting the stability of polyphenylene sulfide resin, the invention provides a polyphenylene sulfide The purpose of the preparation method is to solve the technical problems of large fluctuations in resin quality and many impurities due to the use of solid sodium sulfide in the production process of polyphenylene sulfide resin

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  • Preparation method of polyphenylene sulfide
  • Preparation method of polyphenylene sulfide
  • Preparation method of polyphenylene sulfide

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Embodiment 1

[0023] Embodiment one: a kind of preparation method of polyphenylene sulfide provided by the present invention comprises the following steps:

[0024] (1) Add liquid sodium hydrosulfide and liquid sodium hydroxide into the polymerization kettle and stir evenly through the high-level metering tank, so that sodium hydrosulfide and sodium hydroxide are fully reacted to generate water and sodium sulfide;

[0025] (2) through the catalyst metering tank and the mother liquor metering tank, respectively add the catalyst lithium chloride and the mother liquor NMP into the polymerization kettle;

[0026] (3) Turn on the electric heating system of the polymerization kettle, feed in nitrogen, open the dehydration valve of the polymerization kettle, start the dehydration of the temperature rise, the excess water will be released from the polymerization kettle, and after being condensed by the tail gas condenser, the condensate will be sent to the dehydration liquid collection tank, contain...

Embodiment 2

[0033] Embodiment two: a kind of preparation method of polyphenylene sulfide provided by the present invention comprises the following steps:

[0034] (1) Add liquid sodium hydrosulfide and liquid sodium hydroxide into the polymerization kettle and stir evenly through the high-level metering tank, so that sodium hydrosulfide and sodium hydroxide are fully reacted to generate water and sodium sulfide;

[0035] (2) through the catalyst metering tank and the mother liquor metering tank, respectively add the catalyst lithium chloride and the mother liquor NMP into the polymerization kettle;

[0036] (3) Turn on the electric heating system of the polymerization kettle, feed in nitrogen, open the dehydration valve of the polymerization kettle, start the dehydration of the temperature rise, the excess water will be released from the polymerization kettle, and after being condensed by the tail gas condenser, the condensate will be sent to the dehydration liquid collection tank, contain...

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Abstract

The invention discloses a preparation method of polyphenylene sulfide. The preparation method comprises the following steps of: (1) adding liquid sodium hydrosulfide and liquid sodium hydroxide into apolymerization kettle through a high-level metering tank, and uniformly stirring; (2) respectively adding a catalyst and mother liquor into the polymerization kettle through a catalyst metering tankand a mother liquor metering tank; (3) heating and dehydrating; (4) adding p-dichlorobenzene, sealing the polymerization kettle, and heating; and (5) heating the material in the polymerization kettleto 260-270 DEG C, reacting for 5-7 hours, starting to cool, and purifying after cooling to obtain the final product polyphenylene sulfide. The method has the advantages that the process problems of large resin quality fluctuation and more impurities caused by the use of solid sodium sulfide in the production process of polyphenylene sulfide resin are solved.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, in particular to a preparation method of polyphenylene sulfide. Background technique [0002] Because most domestic polyphenylene sulfide manufacturers choose sodium sulfide crystal water as the solid sulfur source, the mother liquor must be dissolved before adding to the reactor, which will easily cause an imbalance in the ratio of materials, and the process of solid feeding will bring too much Inorganic impurities lead to large fluctuations in the molecular weight of the resin, and there are many low-molecular polymers, which affect the stability of the resin and bring inconvenience to the resin purification in the subsequent process, thus affecting the quality of the finished resin. Contents of the invention [0003] In order to solve the defects in the prior art that when producing polyphenylene sulfide, many inorganic impurities are introduced and a large amount of low-molecular...

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Application Information

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IPC IPC(8): C08G75/0254
CPCC08G75/0254
Inventor 钟俊敏霍翔宙霍伟伟霍冰冰苗泽慧董栋芳
Owner 长治市霍家工业有限公司