Sell pp granules

详情

PP: Non-toxic, tasteless, low density, strength, stiffness, hardness, heat resistance are superior to low-pressure polyethylene, can be used in **0 degrees. Has good electrical properties and high-frequency insulation from humidity, but the low temperature brittle, do not wear, easy to aging. Suitable for production of general machinery parts, corrosion-resistant parts and insulating parts. Common acid and alkali organic solvents it almostdoes not work, can be used for utensils. PP is a semi-crystalline materials, it is to be morerigid than PE and has a higher melting point. As the type of PP homopolymer is higher thanthe temperature above 0C very brittle, and many commercial PP materials is to add 1 to4% ethylene random copolymer or a higher ratio of ethylene content copolymer. PPcopolymer-based material has a lower heat distortion temperature (**0 ℃), lowtransparency, low gloss, low rigidity, but a stronger impact strength, PP, the impact strengthincreases with increasing ethylene content . Vicat softening temperature of PP is **0C. Asa high degree of crystallinity, the surface of the material properties of stiffness and goodresistance to scratches. PP non-existent environmental stress cracking problems.Typically, the use of glass fiber, metal additives or thermoplastic rubber modified PPmethod. MFR PP turnover ranges from 1 to *0. Low MFR of the PP material impactcharacteristics of a good extension, but lower strength. Material for the same MFR,copolymer-based homopolymer-type intensity ratio to be higher. As the crystal, PPcontraction rate is very high, typically 1.8 to 2.5%. And uniformity of shrinkage in the direction other than PE-HD material is much better. With *0% glass additive allowsshrinkage to 0.7%. Homopolymer and copolymer type of PP-based materials haveexcellent resistance to moisture absorption, resistance to acid corrosion, anti-solubility.However, it aromatic hydrocarbons (eg benzene) solvents, chlorinated hydrocarbons(carbon tetrachloride) solvents such as no resistance. PP did not like PE still has a high temperature oxidation resistance.