Pp is what material can be used to wash basin
Can be used to do washbasin.
Process features:
PP in the melting temperature has good mobility, good molding performance, PP in the processing of two characteristics: First: PP melt viscosity with the shear rate increased significantly decreased (less affected by the temperature ); Second: a high degree of molecular orientation and a greater shrinkage.
PP processing temperature is about 200-300 ℃ is better, it has good thermal stability (decomposition temperature of 310 ℃), but the high temperature (270-300 ℃), for a long time to stay in the barrel will be degraded possible. Because the viscosity of PP decreases significantly with the increase of shear rate, the increase of injection pressure and injection speed will improve its fluidity and improve shrinkage deformation and depression. Mold temperature should be controlled in the range of 30-50 ℃. PP melt can pass through a very narrow mold gap and appear Phi front. PP in the melting process, to absorb a lot of heat of melting (greater than the heat), the product is more hot after the mold. PP material processing without drying, PP shrinkage and crystallinity lower than PE.
PP scientific name polypropylene. Is a relatively safe polymer plastic. Can be used for packaging, food, drug containers.
PP can be used to do washbasin, is a relatively safe polymer plastic. The following do more explanation for PP.
PP is a semi-crystalline material. It is harder than PE and has 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 PP increases with increasing ethylene 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 does not exist environmental stress cracking problem. In general, PP is modified by the addition of glass fibers, metal additives or thermoplastic rubbers. PP 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 aromatics (such as benzene) solvents, chlorinated hydrocarbons (carbon tetrachloride) solvents and the like. PP is not like PE as at high temperatures still have antioxidant properties.
