表面改性剂对Zn-Mg-Al水滑石热稳定剂的性能影响

Effect of Surface modifier on the thermal stability of Zn-Mg-Al hydrotalcite

摘要:

对共沉淀法合成的Zn-Mg-Al水滑石进行表面改性，并采用转矩流变仪、静态热老化法评价其作为PVC热稳定剂的性能，重点考察了表面改性剂的种类对其热稳定性能的影响。结果表明，以聚乙二醇为表面改性剂，制备的改性Zn-Mg-Al水滑石抑制PVC的初期着色效果最佳，长期热稳定性能较优。此外，考察了Zn/Mg摩尔比对聚乙二醇改性Zn-Mg-Al水滑石热稳定性能的影响。当Zn/Mg摩尔比为1：3或1：7时，制备的改性Zn-Mg-Al水滑石对PVC的热稳定性能较好。与传统Mg-Al水滑石相比，聚乙二醇改性Zn-Mg-Al水滑石抑制PVC的初期着色性能力更佳。

Abstract:

Surface modified Zn-Mg-Al hydrotalcite was prepared by coprecipitation. And its performance, as a PVC thermal stabilizer, was evaluated by torque rheometer and static thermal aging method. Effect of Surface modifier on the thermal stability of Zn-Mg-Al hydrotalcite was specially investigated in this paper. The results showed that Zn-Mg-Al hydrotalcite, modified by polyethylene glycol, performed the best property for the inhabitation of PVC initial coloration and long-term thermal stability. In addition, effect of Zn/Mg molar ratio on the thermal stability of Zn-Mg-Al hydrotalcite was also investigated. Polyethylene glycol modified Zn-Mg-Al hydrotalcite performed relatively better thermal stability when Zn/Mg is 1:3 or 1: 7. Compared with traditional Mg-Al hydrotalcite, modified Zn-Mg-Al hydrotalcite showed better property for the inhabitation of PVC initial coloration.