镁铝水滑石及其复合体系对PVC热稳定性能的调控_张莉.pdf

19 5 Vol. 19,No.5 2005 5 CHINA PLASTICS May, 2005 PVC * 张 莉, 乔 辉 , 高 翔, 刘忠磊, 吴立峰 ( , 100029) : (LDHs) PVC , 234 , 2 LDHsPVC ; ,, PVC , PVC/ Mg-Al LDHs/ Sn 100B 1. 5B1. 5 ( , ) ,, : ; ; ; : TQ325.3 : : 1001O9278(2005) 05O0079O05 Retardation of Thermo-oxidative Degradation of Paste PVC Resin by Mg-Al Layered Double Hydroxides * ZHANG Li, QIAO Hui , GAO Xiang, LIU Zhong-lei, WU L-i Feng (School of Materials Science and Engineering , eijing University of Chemical Technology, eijing 100029, China) 2+ 3+ Abstract T he effect of molar ratio of Mg / Al in hydrotalcites (LDHs) , a layered double hydroxide, on the thermal stability of paste PVC resin was investigated using colorimeter and TGA. It was found 2+ 3+ that the molar ratio Mg / Al = 2 constituted the optimum one. When the hydrotalcite was used to- gether with lead salt or organotin, a synergistic effect on the thermal stability was observed. A system with weight ratios of PVC/ LDHs/ organotin= 100/ 1. 5/ 1. 5, better higher tensile strength and lower viscosity were achieved in addition to excellent thermal stability. Key words Mg-Al layered double hydroxide; poly(vinyl chloride) ; thermal stability; synergistic effect ( Layered Double Hydrotalcides, LDHs) , , ; [ M2+ M3+ ( OH) ] ( An - ) # mH O, Mg(OH) Al(OH) , PVC 1- x x 2 x/ n 2 2 3 2+ 3+ n - ; PVC M M ,A 2- 2- -