复合水滑石热稳定剂对PVC热稳定性能的影响  

Effect of MgAl-CO_3-LDH/ZnAl-CO_3-LDH composites on thermal stability of PVC

作　　者：刘庆艳[1,2] 杨占红[1] 易师[1] 

机构地区：[1]中南大学化学化工学院,长沙410083 [2]湖南环境生物职业技术学院,衡阳421005

出　　处：《中国有色金属学报》2010年第2期363-370,共8页The Chinese Journal of Nonferrous Metals

基　　金：国家科技支撑计划资助项目(2006BAE03B03);湖南省教育厅资助项目(08D056)资助

摘　　要：采用共沉淀法制备镁铝水滑石和锌铝水滑石,采用XRD、FT-IR对其进行表征,同时将其按不同比例进行复配应用到聚氯乙烯(PVC)中。利用静态热老化法研究复合水滑石稳定剂在聚氯乙烯中的热稳定性能。结果表明:合成的镁铝水滑石和锌铝水滑石结晶度高,结构规整;镁铝水滑石和锌铝水滑石复配物的热稳定性能优于单一镁铝水滑石、锌铝水滑石,其最佳复配摩尔比为x(MgAl-CO3-LDH):x(ZnAl-CO3-LDH)=1:0.7。当该复配物与同样金属含量的ZnMgAl-CO3-LDH(x(Zn):x(Mg):x(Al)=0.7:1:1.7)相比时,前者热稳定性能更好。另外,制备该复配物的工艺较制备ZnMgAl-CO3-LDH的工艺更简单。MgAl-CO3-LDH and ZnAl-CO3-LDH were prepared by co-precipitation method. The synthesized materials were analyzed and characterized by XRD and FT-IR. Then the PVC composites containing MgAl-CO3-LDH and ZnAl-CO3-LDH were prepared with different ratios. The effects of MgAl-CO3-LDH/ZnAl-CO3-LDH composites on the thermal stability of PVC were investigated by static thermal aging test. The results show that MgAl-CO3-LDH and ZnAl-CO3-LDH have high crystallization degree and uniform structure. Compared with single LDH such as MgAl-CO3-LDH, ZnAl-CO3-LDH or ZnMgAl-CO3-LDH, the MgAl-CO3-LDH/ZnAl-CO3-LDH composites have a better long-term stability, and the best adding molar ratio of MgAl-CO3-LDH/ZnAl-CO3-LDH in the composites is 1：0.7 at which the composites of MgAl-CO3-LDH and ZnAl-CO3-LDH have better thermal stability than ZnMgAl-CO3-LDH（x（Zn）：x（Mg）：x（Al）=0.7：1：1.7）. Furthermore, the preparation process of MgAl-CO3-LDH/ZnAl-CO3- LDH composites is not so difficult as that of ZnMgAl-CO3-LDH.

关 键 词：复合水滑石 热稳定剂 PVC 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]