摘要
研究了钪、钷外其他稀土金属硬脂酸皂对PVC热稳定作用。结果表明:它们均属长期型热稳定剂,与少量硬脂酸锌并用可有效改善其抑制PVC初期着色的效能;不同硬脂酸稀土与硬脂酸锌并用稳定的PVC具有相似的初期色相,但中、长期热稳定性不同,其中镧系金属皂的中、长期热稳定性随原子序数呈现明显的奇偶效应递变规律性;硬脂酸稀土具有类似于碱土金属皂的热稳定作用机制。
The heat stabilities and transparencies of stearates of rare earth metals except scandium and promethium used as heat stabilizers as PVC were studied. It was shown that they are all the longtermtype heat stabilizers and their efficiencies in inhibiting the initial coloration of PVC can be improved effectively by combining them with a small amount of zinc stearate. PVC stabilized by various rare earth stearates in combination with zinc stearate has similar initial colorations but different mediumterm and longterm heat stability, those of the lanthanide metal soaps revealing a marked progressive change pattern of oddeven effect with the atomic number. The mechanism of heat stabilization of rare earth stearates seem to be similar to that of alkaline earth metal soaps.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2002年第z2期259-262,共4页
Journal of the Chinese Society of Rare Earths
基金
广东省教育厅资助项目(99050)
关键词
稀土
硬脂酸稀土
聚氯乙烯
热稳定剂
热稳定性
rare earths
rare earth stearate
polyvinyl chloride
heat stabilizer
heat stabilization
