Shanghai Daoqin Plastics Co., Ltd.

　　 polyethylene (PE) is most structure simple polymer/macromolecule, is application most polymer/macromolecule material.
　　 it is heavy 复 –CH2– mono 元连接而 formed. polyethylene (PE) is through ethylene （ CH2=CH2 ） add formed polymerization formed.
　　 polyethylene (PE) plastics raw materials property can 取决于 it polymerization methods. in in and other pressure (15-30 large gas pressure), has machine combined material catalytic conditions lower 进行Ziegler-Natta polymerization formed is high density polyethylene (PE) (HDPE). this type of conditions lower polymerization polyethylene (PE) separation is property, separation very long, molecular weight high 达几十万. if is in high pressure (100-300MPa), high temperature (190–210°C), oxidation material catalytic conditions lower free radical polymerization, production 出 则 is low density polyethylene (PE) (LDPE), it is structure.
　　 polymerization pressure large small : high pressure, in pressure, low pressure;
　　 polymerization methods : method, solvent liquid method, gas versus method;
　　 product density large small : high density, in density, low density, property low density;
　　 product molecular weight : low molecular weight, molecular weight, ultra-high molecular weight.
　　 polyethylene (PE) features
　　 polyethylene (PE) 无臭, 无毒, 手感似 wax, tool has excellent low temperature resistance property can (most low use temperature degree can 达-70～-100℃), chemical stability property good, can resistant large more acid alkali 侵蚀(不 resistant tool has oxidation property acid), normal temperature lower solvent generally solvent agent, water property small, electrical insulation property can excellent 良; polyethylene (PE) for/regarding ring force (chemical and machine function) is very 敏感, heat resistant aging property 差.
　　 polyethylene (PE) property product types 而异, main/primary 取决于 separation structure and density.
　　 polyethylene (PE) types type
　　（1） LDPE: low density polyethylene (PE), high pressure polyethylene (PE)
　　（2） LLDPE: low density polyethylene (PE)
　　（3） MDPE: in density polyethylene (PE), di resin
　　（4） HDPE: high density polyethylene (PE), low pressure polyethylene (PE)
　　（5） UHMWPE: ultra-high molecular weight polyethylene (PE)
　　（6） modified polyethylene (PE): CPE, crosslinked polyethylene (PE) （PEX）
　　（7） ethylene copolymer: ethylene - propylene copolymer （ plastics ）, EVA, ethylene -丁烯 copolymer, ethylene - its it 烯烃（如辛烯POE, ring 烯烃） copolymer, ethylene -不 saturated and ester copolymer （EAA, EMAA, EEA, EMA, EMMA, EMAH）
　　 molecular weight to 3, 000, 000-6, 000, 000 线 property polyethylene (PE) is ultra-high molecular weight polyethylene (PE) (UHMWPE). ultra-high molecular weight polyethylene (PE) strong/high degree non high, can use anti elastic 衣.
　　 main/primary methods:
　　 liquid versus method （ also separation is solvent liquid method and method ） and gas versus method （ material material in reaction device in versus type type ）. main/primary using/adopting 齐格勒 catalytic agent method.
　　 conditions and process 描述: pure degree 99% above ethylene in catalytic agent chlorine titanium and chlorine 二乙基 aluminum in lower, in pressure 0.1-0.5MPa and temperature degree 65-75℃ 汽油 in polymerization to HDPE 淤浆. alcohol understanding bad catalytic agent, in and, water 洗, recycling and polymerization ethylene, drying, pelletizing to product.
　　HDPE
　　（1）淤浆 method HDPE production process/workflow
　　（2）HDPE features
　　 basic property can: 无臭, 无味, 无毒 不 transparent white powder 末, pelletizing rear is white pellets;
　　玻璃化 temperature degree: -78℃;
　　 melting point: ratio low density polyethylene (PE) high, 约126～136℃;
　　 density: 0.942-0.950（无定 type density (25℃): 0.855 g/cm3, density (25℃): 1.00 g/cm3. ）;
　　 is separation is type structure, very less phenomenon, is relatively type crystallization high poly material. mechanical properties excellent low density polyethylene (PE), melting point, its temperature degree ratio low density polyethylene (PE) low, 约-100～-140℃.
　　 advantages:
　　（1）良 good heat resistant property （ soft 化点120-125℃） and resistant property （脆化 temperature degree: -70℃）, use temperature degree can 达100℃.
　　（2） mechanical properties （ tensile, bending, pressure shrink, strong/high degree and hardness excellent 于LDPE, wear resistance good.
　　（3）介 electrical property can excellent 良（ insulation material! ）.
　　（4） chemical stability property good, room temperature lower solvent 于任何 has machine solvent agent, resistant acid, alkali, salt.
　　（5）吸 water property and water 蒸汽透 rate very low （ packaging good material! ）.
　　 disadvantages:
　　（1） resistant aging property can （ hot oxygen aging ） relatively 差—— antioxidant and outer absorption agent;
　　（2） in force function lower, heat deflection temperature (HDT) very low.
　　线形 low density polyethylene (PE) （LLDPE）
　　线形 low density polyethylene (PE) production process main/primary through solvent liquid method and gas versus method, will ethylene and belt/tape has 烷基 支化烯烃, 如4-甲基-戊烯(4-methyl-1-pentene), 己烯, and other copolymer can to property low density polyethylene (PE) (LLDPE). can is other copolymer mono 体LLDPE features? type low density polyethylene (PE), separation in generally has short 支链存 in; mechanical properties high density and low density polyethylene (PE) between; melting point ratio low density polyethylene (PE) high 15℃; low temperature resistance property can ratio low density polyethylene (PE) good; resistant ring force cracking property ratio low density polyethylene (PE) high 数十倍.
　　 low density polyethylene (PE) （LDPE）
　　 low density polyethylene (PE) （LDPE） production process use oxygen or oxidation material and other as agent, make ethylene polymerization is low density polyethylene (PE) methods.
　　 ethylene grade pressure shrink rear reaction device, in pressure 100～300MPa, temperature degree 200～300℃ and agent function lower polymerization is polyethylene (PE), reaction material decrease pressure separation 离, make reaction ethylene recycling rear ring use, melt polyethylene (PE) in add plastics additives rear extrusion pelletizing.
　　LDPE features: low density polyethylene (PE), is color, semi transparent pellets, separation in has long 支链, separation 子间排列不紧密; low temperature tough property very high.

　　 polyethylene (PE) processing and application
　　 polyethylene (PE) can use blow molding, extrusion, injection molding and other methods processing, widely used in manufacturing film, in products, fiber and day use product and other.
　　（1） polyethylene (PE) application film
　　 low density polyethylene (PE) output/production volume semi above blow molding made formed film, this type of film has good transparent property and resistant strong/high degree, used as various food, material, 医药, 化肥, industrial product packaging materials and use film. can use extrusion method processing formed composite/compounding film used for packaging heavy material.
　　1975 year 以, high density polyethylene (PE) film to development, it strong/high degree high, low temperature resistance, anti 潮, has good printing property and can processing property.
　　线 type low density polyethylene (PE) most large applications is made formed film, its strong/high degree, tough property excellent low density polyethylene (PE), resistant property and rigid property relatively good, transparent property relatively 差, still excellent high density polyethylene (PE).
　　 in addition, also can in 纸, aluminum or other plastics film upper extrusion coating polyethylene (PE) coating, made formed polymer/macromolecule composite/compounding material.
　　（2） polyethylene (PE) application in products
　　 high density polyethylene (PE) strong/high degree relatively high, as in products. 如牛奶 bottle, agent bottle; can use blow molding method made formed bottle, 桶, 罐, and other container, or use method made formed 槽车罐 and and other large type container.
　　（3） polyethylene (PE) application tube/pipe sheet/plate 材
　　 extrusion method can production polyethylene (PE) pipe/tube, high density polyethylene (PE) tube/pipe strong/high degree relatively high, lower 铺设; extrusion sheet/plate can 进行二次 processing; can use foaming extrusion and foaming injection method will high density polyethylene (PE) made formed low foam plastics, as sheet/plate and construction material; anti sleeve/set （例如缆索护 sleeve/set ）.
　　（4） polyethylene (PE) application fiber
　　 China is 乙纶, generally using/adopting low pressure polyethylene (PE) as raw materials, made formed combined formed fiber. main/primary used for production and 绳索, or formed short fiber rear used as sheet/slice, can used for industrial resistant acid alkali material.
　　 currently already made ultra- high strength polyethylene (PE) fiber （ strong/high degree can 达3～4GPa）, can used as anti elastic 背心, automotive and upper as use composite/compounding material.
　　（5） polyethylene (PE) application product
　　 use injection molding method production product day use product, 人造花卉, turnover box, small type container, 自行车 and machine parts and other; electrical container, container, use tool, cover/cap and other; manufacturing structural parts need use high density polyethylene (PE).
　　LLDPE application
　　 film, sheet/slice 材—— main/primary;
　　 injection molding products;
　　 electrical cable;
　　 rotational molding products —— high speed 公路指示路标桶;
　　 tube/pipe and pipeline;
　　 other.
　　LDPE application
　　 low density polyethylene (PE) plastics material property versus for soft 一, main/primary used for manufacturing plastics film; electrical cable; hot shrinkage sleeve/set

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