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introduce :pp (popyprolene )material
Dec 08, 2016

Polypropylene is a thermoplastic resin made by the polymerization of propylene. According to the arrangement of methyl groups are divided into isotactic polypropylene (atotactic polypropylene), atactic polypropylene (atactic polypropylene) and syndiotactic polypropylene (syndiotactic polypropylene) three.
Methyl arranged in the same side of the main chain of molecular isotactic polypropylene, if the methyl-orderly arrangement of the main chain in the molecule called random polypropylene on both sides, when the methyl alternately arranged in the molecular main chain on both sides of the inter-said Regulation of polypropylene. General industrial production of polypropylene resin, isotactic structure content of about 95%, the rest of the random or syndiotactic polypropylene. Industrial products to the regulation of the material as the main component. Polypropylene also includes copolymers of propylene with minor amounts of ethylene. Usually a translucent colorless solid, odorless non-toxic. Due to structured and highly crystallized, so the melting point can be as high as 167 ?. Heat, corrosion resistance, steam sterilization products can be its outstanding advantages. Density, is the lightest common plastic. The disadvantage is low temperature impact resistance is poor, easier to aging, but can be overcome by modification.
PP copolymer with low thermal deformation temperature (100 ?), low transparency, low gloss, low rigidity, but have a stronger impact strength, PP impact strength with the increase of ethylene content increases . The Vicat softening temperature of PP was 150 ° C. Due to the high degree of crystallinity, the surface rigidity and scratch resistance of the material are excellent. PP there is no environmental stress cracking problem.
The melt flow rate (MFR) of PP is generally in the range of 1 to 100. Low MFR PP material has better impact resistance but lower ductility. For materials of the same MFR, the impact strength of the copolymerization type is higher than that of the homopolymer type. Due to crystallization, PP shrinkage is very high, generally 1.6 to 2.0%.