中国塑料 ›› 2021, Vol. 35 ›› Issue (2): 14-21.DOI: 10.19491/j.issn.1001-9278.2021.02.003

• 材料与性能 • 上一篇    下一篇

对甲基苯甲酸铈对PVC热稳定性能的影响

赵金钢, 柳召刚(), 郝伟, 李梅, 胡艳宏, 吴锦绣, 冯福山, 李帅   

  1. 内蒙古科技大学材料与冶金学院,轻稀土资源绿色提取与高效利用教育部重点实验室,内蒙古自治区稀土湿法冶金与轻稀土应用重点实验室,内蒙古 包头 014010
  • 收稿日期:2020-08-12 出版日期:2021-02-26 发布日期:2021-02-22

Effect of Cerium P⁃methyl Benzoate on Thermal Stability of PVC

ZHAO Jingang, LIU Zhaogang(), HAO Wei, LI Mei, HU Yanhong, WU Jinxiu, FENG Fushan, LI Shuai   

  1. School of Materials and Metallurgy,Inner Mongolia University of Science & Technology,Key Laboratory of Green Extraction &Efficient Utilization of Light Rare-Earth resources Ministry of Education,Inner Mongolia Key Laboratory of Rare Earth Hydrometallurgy and Light Rare Earth Application,Baotou 014010,China
  • Received:2020-08-12 Online:2021-02-26 Published:2021-02-22
  • Contact: LIU Zhaogang E-mail:liuzg65@163.com

摘要:

用复分解法制备了对甲基苯甲酸铈,确定产物的分子式为Ce(C8H7O23·2H2O。研究了对甲基苯甲酸铈对聚氯乙烯(PVC)的热稳定性能的影响。结果表明,对甲基苯甲酸铈单独作为PVC热稳定剂时,其热稳定性和抗变色性都不强。将对甲基苯甲酸铈与其他热稳定剂联合进行二元、三元及四元复配,产物的协同作用良好,热稳定性有所提升;当复合稳定剂按对甲基苯甲酸铈∶钙锌复合体系∶季戊四醇=2∶1∶2的比例添加到PVC中,PVC样品的热稳定时间和抗变色性能最好,热稳定时间为42 min;对甲基苯甲酸铈的塑化能力良好,对甲基苯甲酸铈作为热稳定剂加入PVC后,PVC混料的塑化时间缩短,动态热稳定时间增加,塑化扭矩和平衡扭矩下降;对甲基苯甲酸铈与PVC降解过程中产生的HCl反应而生成CeCl3,降低了HCl对PVC降解的催化作用,从而达到增强PVC热稳定性能的目的。

关键词: 稀土, 聚氯乙烯, 热稳定性能, 对甲基苯甲酸铈, 复配

Abstract:

Cerium pmethyl benzoate (CPB) was prepared by means of a metathesis method, and its molecular formula was determined to be Ce(C8H7O23·2H2O. The thermal stability of CPB on PVC was further investigated. The results indicated that when CPB was used alone as a thermal stabilizer for PVC, the resultant PVC compound exhibited poor thermal stability and discoloration resistance. However, there is a good synergetic effect on PVC by a combination of binary, ternary and quaternary compounds of CPB with other thermal stabilizers, resulting in an improvement in thermal stability. When the mass ratio of cerium benzoate to calcium zinc composite system and pentaerythritol was set to 2/1/2, the PVC compounds achieved an optimum thermal stability with thermal stability time of 42 min as well as optimum discoloration resistance. CPB also exhibited a good plasticizing capability. When CPB was used as a stabilizer for PVC, the resultant PVC compounds revealed a decrease in plasticizing time, plasticizing torque and equilibrium torque but a significant increase in dynamic thermal stability time. CPB can capture the HCl gas released during the degradation of PVC to generate CeCl3, reducing the catalytic effect of HCl on the degradation of PVC and improving the thermal stability of PVC accordingly.

Key words: rare earth, poly(vinyl chloride), thermal stabilizer, cerium p-methyl benzoate, compound

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