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膨胀型阻燃乙烯—醋酸乙烯酯复合材料制备及阻燃性能的研究 Title:PreparationandFlameRetardancyofExpandablePolyethylene-EthyleneVinylAcetateCompositeMaterials Abstract: Inrecentyears,theincreasingdemandforflameretardantmaterialshasdrivenextensiveresearchintodevelopingefficientflameretardants.Thisstudyinvestigatesthepreparationandflameretardancyofexpandablepolyethylene-ethylenevinylacetate(EVA)compositematerials.Theaimistoevaluatetheflameretardantpropertiesandexplorethepotentialforapplicationinvariousindustries. Introduction: Polyethylene(PE)andethylenevinylacetate(EVA)arewidelyusedinindustrialapplicationsduetotheiroutstandingmechanicalproperties.However,theirhighflammabilitylimitstheirpotentialincertainfields,suchasconstructionandtransportation.ToimprovetheflameretardancyofPEandEVA,variousflameretardantsystemshavebeendeveloped.Amongthem,theexpandablepolyethylene(EPE)isaneffectiveoptionduetoitsexcellentthermalinsulationandfire-resistantcharacteristics. Methods: Thepreparationoftheexpandablepolyethylene-ethylenevinylacetate(EPE-EVA)compositematerialsinvolvedtheblendingofEVAwithEPEbeads.Theblendratiowasoptimizedtoachievethedesiredbalancebetweenflameretardancyandmechanicalproperties.Themixedresinwasthensubjectedtoextrusionandcompressionmoldingtoobtaincompositesheetsofuniformthickness.Theflameretardantpropertieswereevaluatedusingaverticalburningtest(UL94)andconecalorimetertests. Results: TheadditionofEPEtoEVAsignificantlyimprovedtheflameretardancyofthecompositematerials.TheUL94testresultsindicatedthattheEPE-EVAcompositesachievedaV-2rating(self-extinguishing)whentheEPEcontentwasabove30%.Moreover,theconecalorimeterresultsdemonstratedasignificantreductioninpeakheatreleaserate(PHRR)andtotalheatrelease(THR)withincreasingEPEcontent.Thehighestflameretardancywasachievedwith50%EPEcontent,wherethePHRRandTHRwerereducedby40%and35%,respectively,comparedtopureEVA. Discussion: TheimprovedflameretardancyoftheEPE-EVAcompositematerialscanbeattributedtothecombinationofthechar-formingabilityofEPEandtheflame-retardantprope