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Low-chlorine polyphenylene sulfide resin synthesis process

A technology of polyphenylene sulfide resin and synthesis process, which is applied in the field of chemical synthesis, can solve the problems of being unsuitable for large-scale production, low production efficiency, complicated production process, etc., so as to improve the single-pass conversion rate and the yield of products, and improve Work efficiency, the effect of overcoming many processes

Inactive Publication Date: 2016-06-08
吕艳
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  • Application Information

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Problems solved by technology

In the current synthesis process of low-chlorinated polyphenylene sulfide resin, the process flow is not easy to implement, the purity of the finished product of low-chlorinated polyphenylene sulfide resin is too low, the reaction residue cannot be recycled, the production process is complicated, the production efficiency is low and High cost, not suitable for mass production

Method used

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Embodiment

[0013] The synthetic technique of the low chlorine polyphenylene sulfide resin of the present embodiment comprises the following steps:

[0014] (1) In the sodium sulfide dehydration treatment stage, the sodium sulfide pentahydrate crystals are added to the ordinary reaction kettle, under the protection of carbon dioxide gas, and heated to 140°C to fully dissolve the sodium sulfide, and then the solution is input into the heat preservation temperature of 120°C Equipped with 5 layers of 18cm / layer 5 angstrom molecular sieve water absorption column, the sodium sulfide solution is treated by molecular sieve water absorption;

[0015] (2) After 1) water absorption treatment, after the water content in the sodium sulfide solution is 1.2mol / molNa2S, the NMP solvent is added from the top of the water absorption column of the molecular sieve, and directly flows into the high-pressure reactor, and then NaOH and the corresponding mole of NaOH are added to the reactor. Specific mass of p...

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Abstract

The present invention discloses a low-chlorine polyphenylene sulfide resin synthesis process. According to the present invention, sodium sulfide and p-dichlorobenzene are adopted as raw materials, N-methyl-2 pyrrolidone is adopted as a solvent, and a molar ratio of the sodium sulfide to the p-dichlorobenzene is 1 :1; and the synthesis process mainly comprises that at a sodium sulfide dewatering treatment stage, a water absorption column of a five-layer 18 cm / layer 5 angstrom molecular sieve is used to carry out thermal insulation water absorption on a sodium sulfide solution to obtain the sodium sulfide solution with a water content of 1.2-1.5 mol / mol Na2S, and the molar mass of added NaOH is 0.1-0.3 mol / mol Na2S, and at a condensation polymerization stage, 0.1-0.05 mol / mol Na2S of Na2SO4 and 0.01 mol / mol Na2S of H2S are added. According to the present invention, the product has characteristics of low total halogen element content, low polydispersity coefficient, narrow molecular weight distribution, high oxygen index and excellent electrical insulation property, and can be used as the packaging material of electronic devices.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a synthesis process of low-chlorine polyphenylene sulfide resin. Background technique [0002] The synthesis process of low-chlorine polyphenylene sulfide resin at least includes basic processes such as drying, absorption, and dehydration. In the current synthesis process of low-chlorinated polyphenylene sulfide resin, the process flow is not easy to implement, the purity of the finished product of low-chlorinated polyphenylene sulfide resin is too low, the reaction residue cannot be recycled, the production process is complicated, the production efficiency is low and The cost is high and is not suitable for mass production. Contents of the invention [0003] In order to overcome the above-mentioned technical problems existing in the prior art field, the purpose of the present invention is to provide a synthesis process of low-chlorinated polyphenyle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G75/02
Inventor 吕艳
Owner 吕艳
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