PPS plastic is a kind of thermoplastic engineering plastics with excellent comprehensive properties. Its outstanding features are high temperature resistance, corrosion resistance and superior mechanical properties. At present, the domestic PPS vendors have Shanghai model chemical industry, etc., by 2000, the world's PPS production can reach 50 thousand tons / year.
Polyphenylenesulphide density: 1.36 g / cubic centimeter molding shrinkage: 0.7% molding temperature: 300-330 degrees C. It is a kind of thermoplastic engineering plastics with excellent comprehensive properties, which is characterized by high temperature resistance, corrosion resistance and superior mechanical properties. PPS is a sulfur-containing aromatic polymer. Linear PPS is crosslinked at 350 DEG C and is thermosetting plastic. The branched structure PPS is thermoplastic. PPS was the first industrialized producer of the Phillips company in the United States in 1971. After the patent expired, Japanese enterprises began to develop and manufacture. Japanese companies are more typical of Japan's Dongli companies. At this stage, Japan's production has been greater than that of the United states. Other manufacturers are also concentrated in the United States, Japan and europe.
Five of the world's largest PPS producer, Phillips, Dongli, and Japan Polyplastics taikena ink. Tianjin synthetic material research institute, China Guangzhou chemical reagent factory two, Sichuan Zigong chemical reagent factory, Hebei Institute of chemical engineering department and Guangzhou Chemical Research Institute and other units have a small scale, but are not stable and continuous production. At present, the domestic PPS vendors have Shanghai model chemical industry, etc., by 2000, the world's PPS production can reach 50 thousand tons / year. PPS's largest demand for Japan accounted for 33%, North America accounted for 32%, Western Europe accounted for 19%, Asia Pacific accounted for 16%.
PPS is a white powder with an average molecular weight of 0.4-0.5 million and a density of 1.3-1.8 grams per cubic centimeter, and PPS has very excellent thermal properties. Add the thermal performance of glass fiber reinforced after the higher, at 232 degrees Celsius by 5000h after heat aging, such as glass fiber, carbon fiber and filler to enhance the mechanical properties of the modified PPS can maintain high mechanical properties and dimensional stability in the long-term work load and thermal load. It can be used in high temperature stress environment.
The dielectric constant of PPS is very small, very low dielectric loss, surface resistivity and volume resistivity is not sensitive to the change of frequency, temperature, humidity, electrical insulating materials is excellent, the arc time is longer, the chemical stability of PPS is quite good, in addition to the strong oxidizing acid such as sulfuric acid, concentrated erosion nitric acid and aqua regia, most of it from the erosion of acid salt, chemical stability is close to PTFE. At less than 175 degrees Celsius, insoluble in any known organic solvents, PPS and general organic solvent contact, no plastic parts cracking phenomenon.
Chemical resistance: it has not been found that solvent of polyphenylene sulfide can be dissolved below 200 DEG C, and its resistance to inorganic acids, alkalis and salts is very strong. Not resistant to chlorinated biphenyl and oxidizing acid, oxidant, aqua regia, hydrogen peroxide and sodium hypochlorite etc..
PPS radiation resistance, radiation resistance to Gy 1 * 108, is a new material for other engineering plastics are incomparable, in electronics, electrical, mechanical, instrumentation, aerospace, military and other atomic bomb, especially in the field of fine materials as bullets, radiation resistant only ideal.
The chemical structure of PPS is quite stable and contains flame retardant element sulfur, so PPS has excellent flame resistance. The test piece is ignited, and the flow rate of oxygen and nitrogen is adjusted to observe the combustion situation. The oxygen concentration that makes the test piece burn continuously is the limiting oxygen index, and the higher the value, the better the flammability. The limiting oxygen index of pure PPS can be as high as 44, and it also has good flame resistance. The limiting oxygen index of PPS with filler or glass fiber is higher, and its flame resistance is better.
Pure PPS can be passed UL-94 V0 grade when the thickness is 0.8mm. Basically, in addition to a small number of grades, such as the ultra tough series, the UL94 flammability of all grades of PPS is V-0, and has been the best in the flammability of UL 94. The tough series PPS contains some toughening agents that will sacrifice some flammability.
The PPS grades of pure PPS and no added conductors have excellent electrical insulation properties. The PPS grade of the carbon fiber has a rather low volume resistivity.
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