High-molecular weight polyphenylene sulfide resin as well as preparation method and application thereof

Abstract

The invention relates to high-molecular weight polyphenylene sulfide resin as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: taking a sulfur-containing compound and a halogenated aromatic compound as raw materials, taking an alkali compound and fatty acids as a poly-condensation aid, performing poly-condensationreaction, obtaining a polyphenylene sulfide primary product after purification treatment and then enabling the polyphenylene sulfide primary product to react with a chain extender at a high temperature to generate the high-molecular weight polyphenylene sulfide resin. The preparation method provided by the invention is high in yield and low in cost and has the characteristic that polyphenylene sulfide resins with different melt viscosities and molecular weights are selectively and controllably prepared; the obtained polyphenylene sulfide resin has excellent heat resistance. The polyphenylenesulfide resin obtained by the preparation method provided by the invention can be used for producing plates, tubes and bars and performing cutting, grinding, polishing, drilling and other mechanical processing like metals, can also be used for making fibers, membranes and thin films and is particularly suitable for the fields such as automotive parts, electronic / electrical equipment, chemical industry and mechanical industry.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a high-molecular-weight polyphenylene sulfide resin, in particular to a linear high-molecular-weight polyphenylene sulfide resin with high thermal stability, and to a preparation method of the polyphenylene sulfide resin and uses. Background technique [0002] Polyphenylene Sulfide (PPS) is an engineering plastic with excellent heat resistance, chemical resistance, flame retardancy, mechanical strength, electrical properties, and dimensional stability. Since PPS can be formed into various molded products, films, sheets, fibers, etc. by general melt processing methods such as extrusion molding, injection molding, and compression molding, it is widely used in the fields of electronic and electrical equipment, automotive equipment, etc. High-molecular-weight polyphenylene sulfide, due to the increase in molecular weight, has more excellent performance, is more widely used, and is mor...

AI Technical Summary

Problems solved by technology

However, the polyphenylene sulfide resin obtained by the thermal cross-linking method has a deep color and cannot be used for applications requiring natural color, and the high molecular weight polyphenylene sulfide obtained by the above two methods has branched chains of different degrees, resulting in polyphenylene sulfide Changes in performance thus limiting its usefulness

High-molecular-weight polyphenylene sulfide can also be synthesized by using different sulfur sources, but the equipment is more complicated, the purity of the sulfur source is uncontrollable, and the process repeatability and safety cannot meet the production requirements.

However, increasing the water content of the polymerization system or adding reactive monomers during the polymerization process to increase the molecular weight of polyphenylene sulfide will greatly increase the reaction pressure, thereby putting forward higher requirements for the reaction device, or the loss of polyphenylene sulfide during the process is relatively large. Many, high energy consumption, complex and uncontrollable process