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1、低密度聚乙烯(LDPE)Low-densitypolyethylene(LDPE)主要用途低密度聚乙烯是高压下乙烯自由基聚合而获得的合成树脂,低密度聚乙烯主要用于做薄膜产品,在农业用薄膜(如地面故又称“高压聚乙烯”。由于分子链中含有较多的长短支覆盖薄膜、大棚膜等)、包装用膜(可用于糖果、蔬菜、冷链,因此产品密度较小,柔软,耐低温性、耐冲击性较好;冻食品等包装)、液体包装用吹塑(涂覆)薄膜(可用于牛具有良好的化学稳定性,除强氧化酸外,一般情况下耐酸、奶、酱油、果汁、豆腐、豆奶等包装)、重包装袋、收缩包碱、盐类的腐蚀作用,具有优异的电
2、绝缘性能,水蒸气透过装薄膜、弹性薄膜、内衬薄膜、建筑用薄膜以及一般工业包率低,流动性好,具有良好的成型加工性能,适合注塑、挤装薄膜和食品袋等方面有广泛的应用;低密度聚乙烯还用于塑、吹塑、旋转成型、涂覆、发泡工艺、热成型、热风焊、电线电缆绝缘和护套,经过交联的低密度聚乙烯是高压电力热焊接等热塑性成型加工的各种工艺。电缆绝缘层的主要材料;此外,低密度聚乙烯还用于注塑制品,如塑料花、医疗器具、药品和食品包装材料;挤塑成型Low-densitypolyethylene(LDPE)isasyntheticresinusinga管材、板材、异
3、型材等制品;低密度聚乙烯也可用于生产吹highpressureprocessviafreeradicalpolymerizationofethylene塑成型中空制品,如食品容器,药物、化妆品、化工产品的andisthereforealsocalled“high-pressurepolyethylene”.Sinceitsmolecularchainhasmanylongandshortbranches,LDPEis容器,槽罐等。lesscrystallinethanhigh-densitypolyethylene(HDPE)an
4、ditsApplicationsdensityislower.Itfeatureslight,flexible,goodfreezingresistanceLDPEisprincipallyusedformakingfilms.Itiswidelyusedinandimpactresistance.LDPEischemicallystable.Ithasgoodtheproductionofagriculturalfilm(mulchingfilmandshedfilm),resistancetoacids(exceptstrong
5、lyoxidizingacids),alkali,salt,packagingfilm(foruseinpackingcandies,vegetablesandfrozenexcellentelectricalinsulationproperties.Itsvaporpenetrationratefood),blownfilmforpackagingliquid(foruseinpackagingmilk,islow.LDPEhashighfluidityandgoodprocessability.Itissuitablesoysauc
6、e,juice,beancurdsandsoymilk),heavy-dutypackagingforbeingusedinalltypesofthermoplasticprocessingprocesses,suchasinjectionmolding,extrusionmolding,blowmolding,bags,shrinkagepackagingfilm,elasticfilm,liningfilm,building-rotomolding,coating,foaming,thermoforming,hot-jetwe
7、ldingandusefilm,general-purposeindustrialpackagingfilmandfoodthermalwelding.bags.LDPEisalsowidelyusedintheproductionofwire&cableinsulationsheath.Cross-linkedLDPEisthemainmaterialusedintheinsulationlayerofhigh-voltagecables.LDPEisalsousedintheproductionofinjection-mold
8、edproducts(suchasartificialflowers,medicalinstruments,medicineandfoodpackagingmaterial)andextrusion-moldedtubes,plates,wire&ca