Process for producing polyphenyl thioether

Abstract

The invention relates to a process for producing polyphenyl thioether, comprising the following steps of:, mixing hydrogenous sodium sulfide, lithium chloride and N-methyl pyrrolidone in the weight ratio of (20-25): (2-6): (70-80), co-boiling the mixture and inert gases at 150-210 DEG C for distilling and dehydrating; separating solvent by refining; respectively adding santochlor, solvent and lithium chloride in anhydrous sodium sulfide, separating after complete reaction to obtain polyphenylene sulfide; compositely washing the polyphenylene sulfide to obtain pure polyphenylene sulfide; and reclaiming the lithium chloride by filtering, reclaiming the solvent and flashly evaporating dimethylbenzene solution in a two-period mode and cooling and crystallizing. The invention has the advantages of low cost, simple process, excellent performance of synthetic resin and high solvent recovering rate.

Description

technical field [0001] The invention relates to a production process of a polymer material, in particular to a process for producing polyphenylene sulfide. Background technique [0002] Polyphenylene sulfide is referred to as PPS, which has excellent thermal stability, short-term heat resistance and long-term continuous use thermal stability, as well as good corrosion resistance, adhesion and fluidity, while PPS has very low dielectric constant, inductance and dielectric loss factor, and has excellent insulation and dielectric properties in high temperature, high humidity and other environments. Therefore, as a special engineering plastic with excellent performance, it has been widely used in the fields of automobiles, electrical electronics and machinery. [0003] At present, there are many synthetic routes of polyphenylene sulfide, but there are only two routes that have been industrialized or have industrial value: one is the industrialized Phillips route (i.e. sodium su...

AI Technical Summary

Problems solved by technology

At present, most of the domestic units developing polyphenylene sulfide adopt the method of dehydration outside the kettle to prepare anhydrous sodium sulfide, and then mix with p-dichlorobenzene in the polar organic solvent hexamethylphosphoric triamide under normal pressure. Under such an immature process route of reaction, the production often encounters great difficulties in the refining of sodium sulfide. In addition, the reaction catalytic system is backward and the process control is difficult, resulting in low solvent recovery rate, high production cost, and product reproduction. Poor performance and low molecular weight, so these research and development and experiments have ended in failure