Polyethylene

Polyethylene characteristics:Polyethylene, abbreviation PE, ethylene by polymerization is made a thermoplastic resin. In industry, also including ethylene and small amounts of alpha olefins copolymer.

Polyethylene odurless, non-toxic, feel like wax, good low temperature resistance performance (minimum using temperature can reach - 70 ~ - 100 Degrees Celsius), chemistry stability is good, they most acid-base erosion (not bear with oxidative acid), under normal temperature insoluble in general solvent, water imbibition small, electrical insulating excellent performance.Polyethylene species:(1) LDPE: Low density polyethylene, high pressure polyethylene(2) LLDPE: Linear low density polyethylene(3) MDPE: Medium density polyethylene, petronas resin(4) HDPE: High density polyethylene, low pressure polyethylene(5) ultra-high molecular weight polyethylene (UHMWPE )6) modified polyethylene: CPE, crosslinked polyethylene (PEX)(7) ethylene copolymer: Ethylene propylene copolymer (- plastic), EVA, ethylene copolymer, ethylene - the world other olefins (such as essien ene concepts behind POE, ring olefins), ethylene copolymer unsaturated ester copolymer (EAA, EMAA, EEA, EMMA, EMAH), EMA.Molding character:1.

Crystallization material, moisture absorption small, need not fully dry, liquidity is extremely good liquidity of pressure sensitive, with high pressure injection molding inappropriate material, temperature uniformity, filling speed, pressure-keeping fully. Should not use direct runner, prevent shrinkage is uneven and stress increased.

Pay attention to choose gate location, prevent to produce shrinkage and deformation.2. Shrinkage range and shrinkage is big, clear direction, easily deformed. The cooling speed should be slow, mould set point, and a cold material cooling system.3. The heating time shoulds not be too long, or there may be an decomposition.4.

Soft plastic parts have a shallow groove, lateral force demoulding.5.

Possible melt body rupture, unfavorable contact and organic solvents, to prevent crazeAll kinds of polyethylene product use:High pressure polyethylene: More than half for film products, followed by tubing, the injection molding products, wire wrapped layer pushbottons,Pressure polyethylene: In injection molding products and hollow products mainly.Ultrahigh pressure polyethylene: Because of ultra-high molecular polyethylene excellent comprehensive performance, can be used as a engineering industry development:Polyethylene (PE) is China's general synthetic resin, the most widely used in varieties, mainly used to make films, containers, piping, monofilament, electric wire and cable, commodity etc, and can be used as television, radar etc of high-frequency insulating materials.

Along with the development of petroleum chemical industry, polyethylene production is rapidly developing, production accounted for about plastic production 1/4.

China's national economy sustained and rapid development of synthetic resin industry, to create a favorable atmosphere, polyethylene (PE) industry is more rapid 2008-2011 years, in the Asia-pacific region polyethylene new project located mainly in China, India and South Korea, China will continue to become power source.

China is becoming the world's largest PE film and packing exporter, large supply of North America, Western Europe and Japan. Additional impact on the film, woven bag, pipes, cable materials, hollow container, the turnover box products demand will drive the polyethylene consumption growth.

So China, polyethylene capacity will continue at a rapid growth, by 2010 China polyethylene output will reach 17 tons, demand will reach 1414 tons, market development outlook.