AI(OH)3和Mg(OH)2对PVC热解特性的影响研究.pdf

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1、第28卷第1期无机化学学报V0J．28No．12012年1月CHINESEJOURNALOFINORGANICCHEMISTRY207．212AI(OH)3和Mg(OH)2对PVC热解特性的影响研究何翊(中国人民武装警察部队学院训练部，廊坊065000)摘要：利用热重分析仪并借助电导率测定法探讨了AI(OH)，和Mg(OH)2对PVC热解特性的影响，简要分析了其机理。结果表明：加入AI(OH)，和Mg(OH)：后均能增加PVC体系在第一阶段的最大热解速率和残炭量，最大热解速率增加约1倍，残炭量增加约4倍。并且分解产生的结晶水吸收大量的热量，惰性金属氧化物

2、也有利于成核、炭层生长和凝聚，有着明显的阻燃和抑烟作用。HCI毒性气体的释放主要集中在体系的第一阶段，AI(OH)，能促使HC1提前释放，HC1的释放总量增加，Mg(0H)也能促使HC1提前释放．但HC1的释放总量却是减少的。关键词：聚氯乙烯(PVC)；金属氢氧化物；热解特性；氯化~(HC1)中图分类号：TK121：X924文献标识码：A文章编号：1001—4861(2012)01—0207—06ThermalDegradationPropertiesofFlexiblePVCFilledwithAluminaTrihydrateandMagnesium

3、HydroxideHEYi(StaffOffice，TheChinesePeoplesArmedPoliceForcesAcademy,Langfang,Hebei065000,China)Abstract：ThethermaldegradationbehaviorsandtheHCltoxicgasreleasecharacteristicsofflexiblePVCanditsfillerstreatedwithaluminatrihydrate(ATH)andmagnesiumhydroxide(MH)werestudiedbythermalana

4、lysisandconductancemethod．Themechanicalpropertieswerealsoinvestigatedbriefly．ComparedwiththesamplesofplasticizedPVCpolymerwithoutmetalhydroxideadditives，inthetreatedsamplestherearemoreratesofmaximalpyrogenationatthefirststage，enhancingbothaboutonetime，andhighermassofresidualchar，

5、advancingaboutfourtimes．Thewatergeneratedisturnedintosteamandsteamalsotakesheatawayfromthedegradationpoints，andtheinertoxidesdecomposedfrommetalhydroxidesarebeneficialtotheprocessofnucleation，growthandaggregation．Thesearealsoindicatedthatthemetalhydroxidesweretheveryeffectiveflam

6、eretardantandsmokesuppressionactionforflexiblePVC．ThethermaldecompositionbehaviorsofPVCanditsfillersatthefirststagearemainlyduetotheemissionofHC1，themaximalabsorptivityofsmokeVSlight，thetimeofmaximalsmokedensityandthemassofresidueafterburningchangemarkedly．Metalhydroxidescanbetak

7、enaseffectivecatalyzersfortheevolutionofhydrogenchlorideandcharformationinthethermaldegradationprocessofPVC．Keywords：poly(vinylchloride)；metalhydroxide；thermaldecomposition；hydrogenchloridePoly(vinylchloride)(PVC)isakindofwell—knownstrip，electricalwire，andcable，etc【1JIThehighchlo

8、rideandeconomicalthermoplastic，whichhasb