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利用热重分析仪并采用电导率测定法探讨了几种金属氧化物对聚氯乙烯(PVC)热解时HCl释放过程的影响。结果表明,HCl溶液在0～5.5×10-4mol/L浓度范围内浓度与电导率呈线性关系。ZnO、Fe2O3、CuO、MnO2使PVC的热解起始温度降低,从而使单位质量PVC释放HCl的起始时间缩短,对PVC热解脱HCl有明显的促进作用。而TiO2、MoO3、V2O5却使PVC的热解起始温度升高,起始脱HCl时间延长,对HCl的脱出反应有较强的抑制作用。但加入金属氧化物的PVC体系释放HCl总量并没有超过纯PVC体系。
The effects of several metal oxides on the release of HCl during pyrolysis of polyvinyl chloride (PVC) were investigated by thermogravimetric analyzer and conductivity measurement. The results showed that there was a linear relationship between the concentration and the conductivity of HCl solution in the concentration range of 0 ~ 5.5 × 10-4mol / L. ZnO, Fe2O3, CuO and MnO2 reduced the initial pyrolysis temperature of PVC, which shortened the initial time for the release of HCl per unit mass of PVC, and promoted the removal of HCl from PVC. However, TiO2, MoO3 and V2O5 increased the initial pyrolysis temperature of PVC, prolonged the initial de-HCl, and strongly inhibited the release of HCl. However, the total amount of HCl released by the metal oxide-added PVC system did not exceed the pure PVC system.