稀土镧盐改性液体复合热稳定剂的性能研究

通过热烘法、电导率法、热重分析（TG）研究了液体镧盐与钙、锌、钡之间的热稳定剂协同效应。结果表明，稀土镧盐可减缓锌烧，但La／Ca／Zn三元复合热稳定剂用于PVC时，其初期着色现象明显：稀土镧用于高锌配方中发挥优良的抗锌烧性能，当锌含量3％，稀土镧4％时，PVC试片40min后才出现锌烧；La／Ba／Zn三元复合体系有显著的协同效应，La4．5％，Ba4．5％，Zn1％时，180℃下，静态热稳定时间可达45min，PVC的塑化时间、塑化温度、平衡扭矩分别为159S、177℃、18．4N·m。

Research on Property of Liquid Complex Heat Stabilizer Modified by Rare Earth Larium Salt

The synergism of liquid larium salt, as a thermal stabilizer, with calcium, zinc and barium was studied, by using the means of discoloration method , electrical conductivity measuring and TG. The results showed that larium salt could delay zinc burning, but while La/Ca/Zn ternary system as PVC thermal stabilizer, the coloration was taken place in the early period. Larium salt with high content of zinc had excellent characteristic of zinc burning resistance, when 3% content of Zn, 4% of La, zinc burning is occurred after 40 rain. There are remarkable synergism among La/Ba/Zn system, when 4.5% content of La, 4.5% of Ba, and 1% of Zn, stability time at 180℃could be 45 min, and the plasticization time, temperature, and equilibrium torque of PVC are 159 s, 177 ℃, 18.4 N·m respectively.