PVC用热稳定剂镁铝铈类水滑石的合成  

Preparation of MgAlCe-CO_3-HTLcs as heat stabilizer for PVC

作　　者：杨占红[1] 易师[1] 贺红梅[1,2] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]郑州电力高等专科学校,河南郑州421005

出　　处：《中南大学学报（自然科学版）》2011年第4期897-902,共6页Journal of Central South University:Science and Technology

基　　金：国家科技支撑计划项目(2006BAE03B03);湖南省教育厅科学研究项目(08D056);国家自然科学基金资助项目(91023031)

摘　　要：采用低过饱和沉淀法制备具有水滑石结构的镁铝铈类水滑石,探索pH、不同铈铝的物质的量比n(Ce3+)/n(Al3+)、陈化温度和陈化时间对产物晶型的影响,利用XRD,SEM,FT-IR和TG-DTA等对其进行表征,将聚氯乙烯(PVC)、邻苯二甲酸二正辛酯(DOP)、镁铝铈类水滑石(MgAlCe-CO3-HTLcs)按一定比例复配,进行静态热老化试验和刚果红法试验,并对其热稳定性能进行研究。研究结果表明:控制溶液中pH≥11,0.025≤n(Ce3+)/n(Al3+)≤0.050,n(M2+)/n(M3+)=2:1,于110℃陈化8 h,能制备出具有典型的水滑石结构、结晶度高、结构完整、晶型单一的镁铝铈类水滑石。镁铝铈类水滑石能将PVC的热稳定时间延长至约110 min。MgAlCe-CO3-HTLcs were prepared by low saturated precipitation.The effects of many conditions such as pH,different molar ratios of n（Ce3＋）/n（Al3＋）,aging temperature and aging time on the crystal form of MgAlCe-CO3-HTLcs were investigated.The synthesized materials were analyzed and characterized by using XRD,SEM,FT-IR and TG-DTA.The composites consisting of PVC,DOP and MgAlCe-CO3-HTLcs were prepared with specific ration,and the thermal stability of polyvinyl chloride（PVC） composites was studied by static thermal aging test and Congo Red method.The results show that MgAlCe-CO3-HTLcs has high crystallization degree and uniform structure when the preparation condition is as follows： pH≥11,n（M2＋）/n（M3＋）=2：1,0.025≤n（Ce3＋）/n（Al3＋）≤0.050,aging at 110 ℃ for 8 h.The thermal stability of the PVC composites with MgAlCe-CO3-HTLcs is significantly enhanced with the onset of blackening lasting to about 110 min.

关 键 词：镁铝铈水滑石 热稳定剂 聚氯乙烯 热稳定性 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]