Focus on hollow board industry

Pp is a high-density, no side chain, high crystalline linear polymer, with excellent overall performance. PP has a good resistance to solvents, oil, resistant to weak acid, weak base and other properties. POM has a high hardness and rigidity, with a high degree of creep resistance and stress relaxation ability, excellent wear resistance, self-lubricating, and fatigue, other engineering plastics can not be compared.

Pp hollow board

The processing temperature (° C) for polypropylene production is 180 to 240 ° C. So boiling water will not break it, is a semi-crystalline material. PP hollow board raw materials than PE to be more hard and have a higher melting point. Since the homopolymer PP temperature is higher than 0 ° C is very brittle, so many commercial PP material is added 1 ~ 4% ethylene random copolymer or higher ratio of ethylene content of the claw-type copolymer. Copolymer PP material has a low thermal distortion temperature (100 ° C), low transparency, low gloss, low rigidity, but has a stronger impact strength. The strength of the PP hollow plate increases with the increase of the propylene content. PP Vicat softening temperature of 150 ℃. Due to the high degree of crystallinity, the surface stiffness and scratch resistance of this material is very good. PP hollow plate does not exist environmental stress cracking problem. In general, PP is modified by the addition of glass fibers, metal additives or thermoplastic rubbers. PP hollow plate flow rate MFR range of 1 to 40. Low MFR PP material has better impact resistance but lower ductility. For the same MFR material, the copolymer type has a higher strength than the homopolymer type. As a result of crystallization, PP shrinkage is quite high, generally 1.8 to 2.5%. And the direction of the uniformity of shrinkage than PE-HD and other materials much better. Adding 30% of the glass additive reduced the shrinkage to 0.7%. Both homopolymer and copolymer PP materials have excellent resistance to moisture absorption, acid and alkali corrosion resistance, anti-solubility. However, it has no resistance to aromatic hydrocarbons (such as benzene) solvents, chlorinated hydrocarbons (carbon tetrachloride) solvents and the like. PP hollow plate is not like PE as at high temperatures still have antioxidant properties. Polypropylene (PP) is a relatively common kind of plastic, its excellent electrical properties, can be used as heat-resistant high-frequency insulation materials applications. PP is a crystalline polymer, melt condensation due to specific changes in volume, molecular orientation and a high degree of contraction (1.0% -1.5%). PP in the molten state, with the temperature to reduce the viscosity of the role of little. Therefore, in the molding process, should be to improve the injection pressure and shear rate-based, in order to improve the quality of products.