Plastic PPS is a kind of special engineering plastics , pps plastic called poly phenyl sulfide , polyphenylene sulfide . Molecular main chain of the thermoplastic resin with a phenylthio English called polyphenylene snlfide ( referred to as PPS), that is, we often say pps plastic .
PPS engineering plastic is crystallization type (crystallinity of 55%-65%) of the high rigid white powder polymers, high heat resistance (for using temperature of 240 ℃) and mechanical strength, rigidity, difficult to burn sex, anticorrosion chemical resistance, electrical properties, all the fine resin dimension stability, wear resistance, resistance to creep degeneration optimal, flame retardancy optimal. Have self-extinguishing RTV silicone compound. Up to UL94V-0 level, high temperature and high performance to maintain good still. Liquidity is good, easy molding, forming almost no shrinkage concave spot. And all kinds of inorganic packing material has good affinity. Enhance after modification may raise its physical and mechanical mechanical properties and heat resistance (the heat distortion temperature), strengthen material with a glass fiber, carbon fiber, and calendaring aromatic polyamide fiber, metal fibers, etc, with glass fiber primarily. Inorganic stuffing have talc, kaolin, calcium carbonate, silica, mos2, etc.Polyphenylene sulfide (PPS) is a symmetrical crystalline polymers , rigid backbone chain consisting of p-substituted benzene ring and sulfur atom on the repeat . Plasma levels for a variety of coatings, fluidized bed , electrostatic spray , and injection and compression molding was provided. Polyphenylene show excellent chemical resistance to sulfide , thermal stability , size (or size) stability , fire . PPS 's extreme inertness of organic solvents and inorganic salts and bases for the outstanding performance of corrosion coatings for food contact .
Plastic PPS- the material properties1 , electrical insulation (especially high-frequency insulation ) fine , white hard and brittle , falling on the ground with metal sound , light transmittance behind plexiglass , color of water resistance , good chemical stability . Has excellent flame resistance , as non-combustible plastic .
2 , the general strength , good rigidity , but the crisp, easy to produce brittle fracture stress , impatience benzene gasoline and other organic solvents . Long-term use temperature of up to 260 degrees , 400 degrees in the air or nitrogen to maintain stability. By adding glass fiber or other reinforcing material modification, can greatly improve the impact strength , heat resistance and other mechanical properties also increased , the density increased to 1.6-1.9 , molding shrinkage rate to 0.15-0.25 % for smaller production of heat-resistant parts . insulation and chemical equipment. optical instruments and other parts .
The first generation of commercial grade polyphenylene sulfide (PPS) introduced the Phillips Petroleum in 1968, trade name Leiden . These are of two types , the high viscosity of a thermoplastic polymer branching by PTFE-type process , and began to linear polymer compressibility modulus . Subsequently, in 1973 in Europe , is the focus of the study shifted to injection molding and coating processes.
At present, China pps plastic composite pellets with modified total market demand is greater than 8000 tons / year , and growing rapidly , the annual demand growth rate of 15% -20 % . Consumer of PPS Model GM varieties still 0% -40 % glass fiber reinforced materials mainly applied to electronic appliances, precision machinery, automobile, motorcycle and petroleum , chemical industry consumption is steadily increasing . With China's electronics, the automotive industry 's rapid development , pps engineering plastics market prospect is extremely broad , China in 2005 is expected to PPS pellets market demand will reach 10,000 tons / year.
Plastic PPS at home and abroad and new material development trends in the development of new varieties pps plastic -like material , the development of new synthetic methods based PPS should also focus their efforts on the new modified materials and special materials research and development , and actively develop new PPS composite modified varieties , as soon as possible to establish a larger -scale production devices. Among them, as quickly as possible 5000-8000 tons / year of PPS resin production line , the development of engineering plastics in China pps priority . This is the development of China's high-performance structural materials necessary for strategic initiatives, restrictions on foreign technology and to break the blockade , to meet the economic and military high-performance structural materials in various areas of the needs of extremely important significance .
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