Method for desalting purification of polymer product in polyphenylene sulfide production

A polyphenylene sulfide and polymer technology, which is applied in the field of demineralization and purification of polymer products, can solve the problems of poor product quality stability, complicated procedures and high production costs, and achieves the promotion of mutual movement, efficient dehydration and desalination, and reduction of inorganic salts. The effect of the content of

Active Publication Date: 2015-08-05
CHANGZHOU UNIV
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Problems solved by technology

Therefore, the above method has complex procedures in actual production, poor product quality stabil

Method used

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  • Method for desalting purification of polymer product in polyphenylene sulfide production

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Experimental program
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Effect test

Embodiment 1

[0025] Weigh 6g of PPS mixture, filter it while it is hot at 100°C, wash the filter cake once with hydrochloric acid, then add 60g of mixed solvent of N-methylpyrrolidone and water, at a temperature of 60°C, power 280W, ultrasonic frequency 25kHz Ultrasonic cleaning was performed in an ultrasonic cleaner for 1 hour, the solvent was flashed, the filtrate was washed once with deionized water, and dried to obtain a high-purity polyphenylene sulfide product. The solvent recovery rate during the above treatment was 90%, and the salt content of the purified polymer was determined to be 0.07%.

Embodiment 2

[0027] Weigh 6g of the PPS mixture, filter it while it is hot at 105°C, wash the filter cake twice with hydrochloric acid, then add 72g of a mixed solvent of N-methylpyrrolidone, N,N-dimethylacetamide and water. 80 ℃, power 280W, ultrasonic frequency 25kHz ultrasonic cleaning time 2h in the ultrasonic cleaner, flash solvent, the filtrate was washed twice with deionized water, and dried to obtain high-purity polyphenylene sulfide products. The solvent recovery rate in the above treatment process was 93%, and the salt content of the purified polymer was determined to be 0.06%.

Embodiment 3

[0029] Weigh 6g of PPS mixture, filter it while it is hot at 110°C, wash the filter cake with hydrochloric acid three times, then add 90g of mixed solvent of N-methylpyrrolidone, acetone and water, at a temperature of 90°C, power 280W, ultrasonic frequency Ultrasonic cleaning was performed in an ultrasonic cleaner at 25 kHz for 3 hours, the solvent was flashed, the filtrate was washed with deionized water three times, and dried to obtain a high-purity polyphenylene sulfide product. The solvent recovery rate in the above treatment process was 95%, and the salt content of the purified polymer was determined to be 0.03%.

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Abstract

The present invention relates to a method for desalting purification of the polymer product in polyphenylene sulfide production, and belongs to the technical field of chemical industry materials. A purpose of the present invention is to provide a method for efficiently removing salts, water, solvents and other impurities from the polymer product during a polyphenylene sulfide synthesis process so as to achieve solvent recovery and efficient polymer desalting. According to the present invention, the method can be applied in the post-treatment process, wherein the post-treatment process comprises: adopting anhydrous sodium sulfide and p-dichlorobene as raw materials, and carrying out a high temperature high pressure solution condensation polymerization reaction to produce a polyphenylene sulfide resin product; the method is characterized in that after completing the condensation polymerization reaction, the polyphenylene sulfide mixture in the reaction system is subjected to filtration separation, and the separated filter cake is subjected to acid washing, ultrasonic washing, water washing and drying to obtain the purified product; and with the method, the inorganic salt content in the polymer product can be significantly reduced, and the quality and the performance of the PPS product can be improved and enhanced.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, and in particular relates to a method for desalting and purifying polymer products containing impurities such as salt, water and solvents produced during the synthesis of polyphenylene sulfide. Background technique [0002] Polyphenylene sulfide (PPS) is a white or beige powder with a structural formula of (C 6 h 4 S) n . In its polymer molecular structure, benzene rings and sulfur atoms are repeatedly connected, and sulfur atoms and benzene rings are arranged alternately and neatly. Due to the rigidity and heat resistance of the benzene ring structure and the stability of the chemical bond between the benzene ring and sulfur, the molecule is endowed with highly stable chemical bond characteristics, and has excellent thermal stability, chemical stability, dimensional stability and electrical properties. PPS resin can be made into various parts through filling modification, various ...

Claims

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Application Information

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IPC IPC(8): C08G75/02
Inventor 樊白白王瑶瑶胡睿张进王利群刘建武马晓明沈介发吴雨豪丁瑞仪张跃严生虎辜顺林
Owner CHANGZHOU UNIV
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