包装用聚乙烯(PE)的性能介绍.ppt

Behaviour on contact with media Chemical resistance Water absorption Ethylene homopolymers and ethylene copolymers with -olefins are water repellent owing to their nonpolar structure. The water absorption (DIN 53 495 Method 1) is less than 0.01 % for unfilled grades and less than 0.5 % for carbon black-filled grades. Copolymers of ethylene with polar monomers have a water absorption capacity of up to 0.3 %, depending on the type and amount of the comonomer. Permeability to gases vapours and liquids Permeability of polyethylene of various densities for different liquids Fire test with plastic fuel tanks according to ECE Regulation 34, Annex 5 Fire test Density MFRI Shear modulus for uncrosslinked HDPE as a function of temperature and of HDPE crosslinked by various means. Crosslinked ？ Blown PE Detailed introduction on Polyethylene William RD, AP Propack How to produce PE from oil? 100×104 ton base oil 4 kinds basic material in petrol production: ?Alkynes (acetylene) ?Olefins (ethene, propylene, butylene, butadiene) ?Arene (benzene、toluene、dimethylbenzene) ?The mixed gas of above material ethene 15×104 t， Propylene 9.0×104 t， Butadiene 2.5×104 t， Arene 8.0×104 t， Petrol 9.0×104 t， Elding oil 47.5×104 t cracking Base oil First production Second production Commodity oil Third production Manufacture basic organise chemical production material Oil with several boiling point range PE, PP , PS and so on Distill catalyse、hydrocracking、delayed coking 、catalytic reforming、dehydrochlorination 、hydrorefining Polymerization Tank reactor Typical particle size distribution of PE granules Pellet creating LDPE is a highly branched homopolymer which contains both short-chain and long-chain branches. HDPE, MDPE and LLDPE consist of predominantly linear molecules with short-chain branches, depending on the type and amount of comonomers. PE: m=0 EVOH: R= -OH EVA: R= -COOCH3 PVA: n→0, R= -OH EAA