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Polyphenylene sulfide preparation method

A polyphenylene sulfide and sodium sulfide technology, applied in the field of polyphenylene sulfide preparation, can solve the problems of single raw material selection and restriction of polyphenylene sulfide preparation process, etc., and achieve universal production process, easy acquisition, and easy preparation method Effect

Inactive Publication Date: 2019-11-19
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The single choice of raw materials restricts the further development of the preparation process of polyphenylene sulfide

Method used

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preparation example Construction

[0024] The invention provides a kind of preparation method of polyphenylene sulfide, comprises the following steps:

[0025] Sodium hydroxide and sodium hydrosulfide are dehydrated to obtain a mixed solution containing sodium sulfide;

[0026] The mixed solution containing sodium sulfide is mixed with p-dichlorobenzene to carry out polymerization reaction to obtain polyphenylene sulfide.

[0027] In the present invention, unless otherwise specified, all raw materials are commercially available products well known in the art.

[0028] In the invention, sodium hydroxide and sodium hydrosulfide are subjected to dehydration reaction to obtain a mixed liquid containing sodium sulfide.

[0029] In the present invention, the mass ratio of the sodium hydroxide and sodium hydrosulfide is preferably (3.0~3.4):(9.8~10.2), more preferably 3.2:10; The form participates in the dehydration reaction, and the mass concentration of the sodium hydrosulfide solution is preferably 45%. In the p...

Embodiment 1

[0040] according to figure 1 The flow process shown, in the three-neck flask equipped with condenser tube, stirrer, thermometer, add N-methylpyrrolidone 40g, mass fraction is 45% sodium hydrosulfide solution 12.445g, sodium hydroxide 4g, lithium chloride 2.1 g, start stirring and feed nitrogen (flow rate 200-300mL / min), heat up to 180-190°C and react for 2-3 hours, the dehydration rate can reach 80%-90%, and a tail gas absorption system is installed at the end of the device . After the dehydration reaction, when the temperature dropped to 100°C, 14.7 g of p-dichlorobenzene and 10 g of N-methylpyrrolidone were added to the three-necked flask, and the temperature was rapidly raised to 190°C for 5 hours. After the polymerization reaction is over, stop stirring, pour the mixed material into hot deionized water at 85°C while it is hot, and place it in a constant temperature tank for heating for 30 minutes, repeat dissolving, washing, and filtering for 6 times, and place it in a ho...

Embodiment 2

[0043] According to the method and steps of Example 1, the difference is that in Example 2: the temperature of the polymerization reaction is 200° C. for 5 hours. Infrared analysis was carried out on the product of Example 2, showing that the product was a PPS polymer; the number average molecular weight of the obtained polymer was 35156, and the yield was 44.56%.

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Abstract

The invention provides a polyphenylene sulfide preparation method, and belongs to the technical field of polymer polymerization. The preparation method comprises: carrying out a dewatering reaction onsodium hydroxide and sodium hydrosulfide to obtain a mixed solution containing sodium sulfide; and adding p-dichlorobenzene to the mixed solution containing sodium sulfide, and carrying out a polymerization reaction to obtain polyphenylene sulfide. According to the present invention, the polyphenylene sulfide is prepared by using sodium hydrosulfide as the raw materials so as to broaden the use range of the raw material; and by controlling the temperature, the polyphenylene sulfides with different molecular weights are prepared within a temperature range of 180-260 DEG C.

Description

technical field [0001] The invention relates to the technical field of polymer polymerization, in particular to a preparation method of polyphenylene sulfide. Background technique [0002] Polyphenylene sulfide (PPS) is a linear polymer compound composed of benzene rings and sulfur atoms arranged alternately. It is white or beige powder. Polyphenylene sulfide is known as the most cost-effective special engineering plastic due to its excellent heat resistance, flame retardancy, corrosion resistance and other characteristics. It has been widely used in many fields such as automobile, textile, chemical industry, aerospace, etc., such as making pump impellers, ball valves, abrasion-resistant rings, insulating sockets, optical fiber cables, etc. [0003] The research on the preparation method of polyphenylene sulfide started earlier at home and abroad. The performance of the polyphenylene sulfide product produced by the early preparation method is relatively poor, accompanied b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G75/0254C08G75/0209
CPCC08G75/0209C08G75/0254
Inventor 赵玲曾旭旭王璐甄卫军
Owner XINJIANG UNIVERSITY
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