What is the performance of PPS plastics for heat resistance and flame retardancy?
Excellent heat resistance: its melting point exceeds 280 ° C, the heat distortion temperature exceeds 260 ° C, and the long-term use temperature is 220-240 ° C. Degradation in air at 700 ° C at 40 ° C inert gas still maintains 40% weight, short-term heat resistance and long-term continuous use of thermal stability are better than all current engineering plastics. The specially modified varieties have a heat distortion temperature of over 350 °C.
It has flame retardancy: polyphenylene sulfide can achieve UL94-0 flame retardancy and LOI >57%. Polyphenylene sulfide itself has a chemical structure that makes it difficult to burn, without the need to add a flame retardant.
Good mechanical properties: extremely rigid, high surface hardness, Rockwell hardness >100HR, tensile strength >170 MPa, flexural strength >220MPa, notched impact strength >16 MPa, flexural modulus >3.5×104, and excellent Creep resistance and fatigue resistance.
Excellent chemical resistance: No solvent has been found to dissolve polyphenylene sulfide below 200 °C, and it is highly resistant to inorganic acids, alkalis and salts.
Good dimensional stability: the molding shrinkage rate is very low, less than 0.0025%, the absorption rate is less than 0.05%, and the linear thermal expansion coefficient is also small. It still exhibits good dimensional stability under high temperature and high humidity conditions. Therefore, it has a wide range of uses in machinery, chemicals, instruments, instruments and aviation, aerospace, ships and other aspects.
Excellent electrical properties: Polyphenylene sulfide still has excellent electrical properties under high temperature, high humidity and high frequency conditions. Its volume resistivity is 1×1016Ω·cm, surface resistivity is 1×1015Ω, and electrical strength is >18KV/mm. .
Outstanding wear resistance: By filling with lubricants such as fluororesin and carbon fiber, the wear resistance can be greatly improved, and the friction coefficient is 0.01-0.02.
Radiation resistance: Resistant to radiation reaches Gy 1×108. It is a new material unmatched by other engineering plastics. It is the only ideal for radiation resistance in the fields of electronics, electrical, mechanical, instrumental, aerospace, aerospace, military, etc., especially atomic bombs and neutron bombs. material.
Good processing performance: PPS resin has low melt viscosity, good fluidity, and easy to wet contact with glass fiber. Therefore, it is easy to fill filler. The glass fiber or inorganic filler prepared by it enhances injection-grade pellets and has extremely high resistance to expansion and contraction. Sex, impact resistance, resistance to bending and ductility. It can be uniformly formed above its melting point.
Good adhesion to metal and non-metal: PPS has a very high bond strength to glass, aluminum, titanium, stainless steel, etc., and adhesion reaches level 1. Good adhesion to glass, it is very suitable for lining of chemical equipment.
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