High molecular weight polyphenylene sulfide resin and its preparation method and use

Abstract

The present invention relates to high molecular weight polyphenylene sulfide resin and its preparation method and application. The present invention uses sulfur-containing compounds and halogenated aromatic compounds as raw materials, basic compounds and fatty acids as polycondensation assistants, carries out polycondensation reaction, and obtains primary polyphenylene sulfide after purification treatment. It reacts with chain extender at high temperature to form high molecular weight polyphenylene sulfide resin. The preparation method of the invention has the advantages of high yield and low cost, and has the characteristics of selectively and controllably preparing polyphenylene sulfide resins with different melt viscosities and molecular weights, and the obtained polyphenylene sulfide resins have excellent heat resistance. The linear high-molecular-weight polyphenylene sulfide resin with high thermal stability obtained by the present invention can be used for producing plates, pipes and rods, and can be processed like metal for machining such as cutting, grinding, polishing, drilling, etc., and can also be used for making fibers, Diaphragms and films are especially suitable for automotive parts, electronic / electrical equipment, chemical and mechanical industries and other fields.

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