Al(OH)_3和Mg(OH)_2对PVC热解特性的影响研究(英文)  

Thermal Degradation Properties of Flexible PVC Filled with Alumina Trihydrate and Magnesium Hydroxide

作　　者：何翊[1] HE Yi(Staff Office,The Chinese People's Armed Police Forces Academy,Langfang,Hebei 065000,China)

机构地区：[1]中国人民武装警察部队学院训练部,廊坊065000

出　　处：《无机化学学报》2012年第1期207-212,共6页Chinese Journal of Inorganic Chemistry

基　　金：公安部应用创新计划(No.2007YYCXWJXY112)资助项目

摘　　要：利用热重分析仪并借助电导率测定法探讨了Al(OH)3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Al(OH)3和Mg(OH)2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。HCl毒性气体的释放主要集中在体系的第一阶段,Al(OH)3能促使HCl提前释放,HCl的释放总量增加,Mg(OH)2也能促使HCl提前释放,但HCl的释放总量却是减少的。The thermal degradation behaviors and the HCl toxic gas release characteristics of flexible PVC andits fillers treated with alumina trihydrate （ATH） and magnesium hydroxide （MH） were studied by thermal analysis and conductance method. The mechanical properties were also investigated briefly. Compared with the samples ofplasticized PVC polymer without metal hydroxide additives, in the treated samples there are more rates of maximal pyrogenation at the first stage, enhancing both about one time, and higher mass of residual char,advancing about four times. The water generated is turned into steam and steam also takes heat away from the degradation points, and the inert oxides decomposed from metal hydroxides are beneficial to the process ofnucleation, growth and aggregation. These are also indicated that the metal hydroxides were the very effective flame retardant and smoke suppression action for flexible PVC. The thermal decomposition behaviors of PVC andits fillers at the first stage are mainly due to the emission of HCl, the maximal absorptivity of smoke vs light, the time of maximal smoke density and the mass of residue after burning change markedly. Metal hydroxides can betaken as effective catalyzers for the evolution of hydrogen chloride and char formation in the thermal degradation process of PVC.

关 键 词：聚氯乙烯(PVC) 金属氢氧化物 热解特性 氯化氢(HCl) 

分 类 号：TK121[动力工程及工程热物理—工程热物理] X924[动力工程及工程热物理—热能工程]