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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 effects of Al (OH) 3 and Mg (OH) 2 on the pyrolysis characteristics of PVC were investigated by thermogravimetric analyzer and conductivity measurement. The mechanism was analyzed briefly. The results showed that the maximum pyrolysis rate and residual carbon content of PVC in the first stage increased with the addition of Al (OH) 3 and Mg (OH) 2, the maximum pyrolysis rate increased about 1 time and the residual carbon amount increased by about 4 Times And the crystallization of water generated by decomposition to absorb a lot of heat, inert metal oxides are also conducive to the nucleation, carbon layer growth and agglomeration, with obvious flame retardant and smoke suppression. The release of HCl gas mainly concentrated in the first stage of the system. Al (OH) 3 promoted the early release of HCl, the total amount of HCl released and Mg (OH) 2 promoted the release of HCl in advance. However, It is reduced.