Method for separating oligomers from polyphenylene sulfide resin synthesis slurry

The technology of a polyphenylene sulfide resin and a process method is applied in the field of polyphenylene sulfide resin production technology, and can solve the problems of complete separation of oligomers, difficulty in recovery, catalyst purification, etc., so as to improve economic benefits and product quality, promote The effect of growth and shortening of coagulation and settling time
CN109705347AActive Publication Date: 2019-05-03YIBIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
YIBIN UNIV
Publication Date
2019-05-03

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Abstract

The invention discloses a method for separating oligomers from a polyphenylene sulfide resin synthesis slurry. The method comprises the following steps: (1) synthesizing polyphenylene sulfide resin; (2) washing the polyphenylene sulfide resin, separated from the synthesis slurry, with water; (3) filtering obtained washing water, and adding the filtered washing water to the synthesis slurry remaining after the separation in order to form a mixed slurry; and (4) adding a first reagent to the mixed slurry, carrying out standing settlement for 2-8 h, and separating and collecting the oligomers obtained after the settlement, wherein the first reagent is one or more selected from nitric acid, sulfuric acid, hydrochloric acid and phosphoric acid. The method can fully desorb and agglomerate the oligomers in the polyphenylene sulfide synthesis slurry, so the recovery rate and the recovery purity of raw materials, solvents, byproducts and catalysts remaining in the synthesis slurry are greatly improved.
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Description

technical field

[0001] The invention relates to the technical field of polyphenylene sulfide resin production technology. technical background

[0002] Polyphenylene sulfide (PPS) resin is a crystalline polymer with high temperature resistance, corrosion resistance, radiation resistance, flame retardancy, balanced physical and mechanical properties, excellent dimensional stability and excellent electrical properties. It is used as a special Engineering plastics are widely used in electronic appliances, aerospace, automobile transportation and other fields.

[0003] Common synthesis methods of polyphenylene sulfide resin include sodium sulfide method, sulfur solution method, hydrogen sulfide method, p-halogenated thiophenol polycondensation method, oxidative polymerization method, etc. Among them, the sulfur solution method is technically difficult and difficult to purify or remove by-products The hydrogen sulfide method has strong corrosive raw materials, serious exhaust ga...

Claims

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