Polyphenylene Sulfide(pps)

Polyphenylenesulfide (PPS) is a new kind of functional engineering plastics containing p-phenylenesulfide repeating structural units. Polyphenylene sulfide is a thermoplastic engineering plastic with benzene sulfur group S on the main chain of its molecular weight is 10000~50000, is a kind of branched chain, no crystallization melting point, high viscosity polymer. Before crosslinking, it is a linear structure. After crosslinking, it is thermosetting. If given sufficient heating and cooling, it can also soften to a certain extent. Polyphenylene sulfide is the condensation of sodium sulfide and dichlorobenzene in a strong polar solvent (hmethylphosphonic amine) at 220A C~225A C. The production methods include maitian method, Fourier method, polycondensation of p-halide Chemicalbook phenylthiophenol salt, polycondensation of aromatic polyhalide and alkali metal sulfide solution, etc. Polyphenylene sulfide relative density is 1.36, resin is white powder or granular, hard and brittle, high crystallinity, melt viscosity (303A C)7? 03 ~ 2? 05Pa? S. polyphenylene sulfide has two kinds of low molecular weight and high molecular weight, low molecular weight polyphenylene sulfide, its molecular weight is between 4000~5000, melting flow value is between 3000~4000. Because of the high melt flow value, it is difficult to directly mold, so in addition to spraying, for other methods of forming must go through a certain degree of cross-linking, and infiltrate a certain amount of glass fiber or inorganic filler, used for injection molding, molding and extrusion molding. High molecular weight polyphenylene sulfide can be directly used to process plastics without cross-linking. Application field In the international market, POLYphenylene sulfide PPS resin is mainly used in engineering plastics, fibers, coatings and films and other fields, each field in the market accounted for the following proportion: plastic 80% fiber 10% coating 5% film 5%. PPS alloys with high wear resistance and self-lubrication properties are widely used in mechanical, automotive, aerospace and military fields. PPS alloys with excellent impact strength and flame retardant properties are mainly used in mechanical industry, electronic and electrical industry and automobile industry. In addition, there are used for wire and cable communication information industry. Plastic grade PPS in PPS resin accounted for the largest proportion, the most widely used. PPS made of devices without flame retardant, small moisture absorption, excellent electrical insulation, can withstand the corrosion of cleaning agent, welding fluid and other corrosive media; PPS has outstanding adhesion and can be made into electronic packaging material, which is used for the packaging of electronic components and integrated circuits with special requirements. In addition, PPS alloy can replace some metal materials, made into some auto parts, such as water tank, carburetor, clutch, oil pump, etc. PPSChemicalbook is even used in landing gear and wing parts of aerospace and commercial aircraft. PPS is also widely used in food and pharmaceutical industry due to physiological inertia. PPS coating has good density, corrosion resistance, the highest use temperature of 300A C after crosslinking, widely used in petrochemical, pharmaceutical food, military, electronic instrument and other industries, such as pipelines, valves, kettle bodies, storage tanks, non-stick pans in corrosive environment. Pure PPS film or PPS composite film prepared by lamination technology can be used for electrical insulation materials, electronic parts, auto parts, diaphragm materials, decorative materials, as well as adhesive tape, printer parts, heat-resistant food packaging materials, etc., can also be made into conductive film. PPS fiber heat resistance is good, similar to PET, PA resin, PPS resin after tensile treatment, its strength and modulus and other properties have been improved, so it can develop new applications in film