沙特6821NELLDPE6821NESABIC6821NE***供应LLDPE是什么材料、LLDPE加工成型、超透明LLDPE、高抗冲击LLDPE、抗UVLLDPE、抗静电LLDPE、高韧性LLDPE、LLDPE塑料、LLDPE粉末、LLDPE塑胶材料、LLDPE塑胶原料、薄膜级LLDPE、LLDPE涂料、纤维级LLDPE。我们直接从厂家提货，属一级***级有限公司货源稳定品种齐全、价格优惠因LLDPE塑胶原料加工成型技术较复杂不成熟的成型技术会使产品性能降低应用受到限制，或成型后达不到制品要求因此本公司有数名***从事化学I业技术的人员为顾客解决加工成型中的技术难题!StructureandcharacteristicsofLLDPE:thestructuralchainofLLDPEisflexibleandlinearlongchain,soLLDPEisathermoplasticpolymerwithexcellentflexibility.Accordingtoitschemicalcompositionandmolecularchainstructure,itisessentiallyahighmolecularweightalkanechainhydrocarbonwithoutpolargroups,sotheattractionbetweenmolecularchainsis***all.ThespatialarrangementofLLDPEchainsisplanarserrated.Becauseoftheregularityandflexibilityofthemolecularchain,themolecularchaincanbefoldedrepeatedlyandarrangedorderlytoformcrystals.InfraredspectrumshowsthatLLDPEmolecularchaincontainsveryfewshortbranches,butthenumberanddegreeofthebranchesofLLDPEobtainedbydifferentpolymerizationmethodsarequitedifferent.TheamountofbranchedchainisexplainedbytheamountofChinLLDPEmolecularchainmeasuredbyinfraredspectroscopy.Theresultsshowthatthereareabout5-10Chinevery1000carbonatomsoflldpchain.ThemolecularchainofHDPEobtainedbylowpressuremethodcontainsonly5-7chper1000carbonatoms,andthechainofHDPEbymediumpressuremethodhaslessch.Ifthemolecularchainofpolyethyleneisacompletelinearstructure,itshouldcontainonly1-2chper1000carbonatoms,becauseinthisidealcase,chcanonlyexistatbothendsofthemolecularchain.TheexistenceofbranchedchainswillinevitablyaffecttherepeatedfoldingandtightstackingofLLDPEmolecularchains,resultinginthedecreaseofcrystallinityanddensity.TheexistenceofbranchedchainwillnotonlyaffectthedensityofLLDPE,butalsoaffectthefluidityofLLDPEmelt.TheabovestructuralcharacteristicsofLLDPEdeterminethatLLDPEhasaseriesofexcellentproperties,suchaschemicalinertia,goodtoughnessandlowtemperatureresistance,excellentdielectricandelectricalinsulation,excellentsolventresistance,etc.,butthemechanicalpropertiesotherthantoughnessarenotveryhigh.LLDPEperformance:LLDPEcanberegardedashighmolecularweightstraightchainalkane,whichiswhitewaxysolidinappearance,slightlyhorny,odorless,tastelessandnon-toxic.Exceptforthefilm,otherproductsareopaque,whichisduetothehighcrystallinityofLLDPEproducts.Accordingtotheshapeofstress-straincurve,LLDPEisatypicalsoftandtoughpolymer.Amongtheindexesofmechanicalproperties,exceptforthehighimpactstrength,othermechanicalpropertiesarelowerinplasticmaterials.ThisisbecauseLLDPEmolecularchainisaflexiblechain,andthereisnopolargroup,andtheattractionbetweenmolecularchainsis***all.Atroomtemperature,theamorphouspartofLLDPEmolecularchainisinahighelasticstate,whichshouldnoth***ebearingcapacity.However,becauseLLDPEisapolymerwithhighcrystallinity,thecrystallinestructureofthecrystallinepart,thatis,thetightstackingofmolecularchainsgivesthematerialacertainbearingcapacity.ThestructuralfactorsthataffectthemechanicalpropertiesofLLDPEare:firstly,thedensityofLLDPEincreases,themechanicalpropertiesexcepttoughness,includinghardnessandstiffness.LLDPE'sthermaldeformationtemperatureisverylowinplasticmaterials,andtherearealsodifferencesindifferentpolyethylene'sthermaldeformationtemperature.Itshygroscopicityisvery***all,lessthan0.01%,whichmakesitselectricalperformancenotaffectedbythechangeofenvironmentalhumidity.Thedielectricc***tantofLLDPEis***all,about2.25-2.35.LLDPEischemicallyinert,notaffectedbynonoxidizingacids,amines,salts,etc.,norbydilutesulfuricacidordilutenitricacidatroomtemperature.However,themechanicalandelectricalpropertiesofLLDPEaredeterioratedbytheoxidationofconcentratedsulfuricacid,concentratednitricacidsulfuricacidandchromicacid.LLDPEundertheactionofmanyactivesubstanceswillproduce"stresscrackingphenomenon,knownasenvironmentalstresscracking,whichisauniquephenomenonofpolyolefinplastics,especiallypolyethylene.LLDPEapplication:LLDPEisoneoftheplasticvarietieswithlargeoutputandwideapplication.LLDPEwasoriginallyusedforhigh-frequencyinsulation.Nowadays,inadditiontohigh-frequencyinsulation,itsmainusesincludethefollowingaspects:(1)extrusionorcalenderingofvariousfilms.LLDPEiswidelyusedinagricultural,seedlingraising,vegetablegreenhouse,horticultural,packagingandpublicationplasticfilmcovers.InadditiontoLLDPE'sownsingle-layerfilm,itcanalsobelaminatedwithothermaterialstoformcompositefilms.(2)LLDPEcanmakevariousindustrialanddailycontainers,suchasoilbarrels,beercans,materialbarrels,bottles,beveragebottles,milkbottles,drugpackagingbottles,detergentbottlesandotherpackagingcontainersofvariousshapesandsizes,whicharemadeofpolyethylene.(3)LLDPEcanbeextrudedintoplates,sheetsandbars,especiallypipes,whichcanbeusedinchemicalplants,c***tructionindustryanddailylife,suchasgaspipelines,waterpipelines,farmlandirrigationpipes,medicalinfusionpipes,etc.LLDPEcanalsobeextrudedintomonofilamentformakingropes,fishingnets,screens,etc.(4)Injectionmoldingintovariousindustrialanddailyproducts,LLDPEcanbeinjectionmoldingintoavarietyofdailyproducts,suchas***ets,basins,bowls,lampshades,bottleshells,teaplates,combs,ricebaskets,toys,stationeryandentertainmentproducts,andcanalsobeusedtopreparesomepartsofbicycles,automobiles,tractors,instrumentsandmeters.(5)Extrusionmoldingwireandcablesheath(-generallyneedtobemodified),highfrequencyinsulationstructure(commonlyusedcross-linkedgrade),y-classelectricalinsulationproducts.(6)Anticorrosivecoatingofvariousequipmentanddevices(sprayingmethodisadopted).(7)foamproducts,suchasshockproofandthermalinsulation,soundabsorbingmaterials,shockproofcushioningpackagingmaterials,furnitureproducts,sportinggoodssuchascushi***,helmetlining,etc.)