含二苯甲酮结构的稀土配合物对PVC光稳定性能的影响
Effect of Rare Earth Complexes Containing Benzophenone Structure on Light Stability of PVC
黄旭博 1柳召刚 1杜桂芳 1陈明光 2胡艳宏 1吴锦绣1
作者信息
- 1. 内蒙古科技大学材料与冶金学院,内蒙古包头 014010;内蒙古自治区稀土湿法冶金与轻稀土应用重点实验室,轻稀土资源绿色提取与高效利用教育部重点实验室,内蒙古包头 014010
- 2. 内蒙古科技大学材料与冶金学院,内蒙古包头 014010;包头稀土研究院,内蒙古包头 014010
- 折叠
摘要
兼具热和光稳定性的稀土稳定剂,对降低聚氯乙烯(PVC)加工成本,提高PVC的生产效率和打开稀土稳定剂的应用领域具有重要的意义,因此,通过人工加速紫外老化实验和户外自然光老化实验,研究了2,4-二羟基二苯甲酮镧(LBP)、2-苯甲酰苯甲酸镧(LBA)及三元复合稳定剂对PVC光稳定性能的影响.结果表明:添加含LBP和含LBA的两种三元复合稳定剂(LBP∶ZnSt2∶PE=2∶1∶2,LBA∶ZnSt2∶PE=1∶1∶3)的PVC片材,人工紫外老化10 d后,失重率分别为2.7％和6.2％,自然光老化35 d后,拉伸强度保留率分别为87.6％和81.8％,复合稳定剂提高PVC的光稳定性能最佳.稀土稳定剂可以吸收PVC降解产生的氯化氢,降低氯化氢的浓度,从而减弱氯化氢对PVC降解的催化作用,抑制PVC脱去HCl形成双键,防止双键在氧作用下,形成过氧化物生成羰基化合物.
Abstract
Rare earth stabilizers with both thermal and light stability are of great significance for reducing PVC processing costs,improving PVC production efficiency and opening up the application fields of rare earth stabi-lizers.Therefore,the effects of 2,4-dihydroxybenzophenone lanthanum(LBP),2-benzoylbenzoate lanthanum(LBA)and ternary composite stabilizers on the light stability of PVC were studied through artificial accelerated UV aging experiments and outdoor natural light aging experiments.The results show that the weight loss rates of PVC sheets with LBP and LBA(LBP∶ZnSt2∶PE=2∶1∶2,LBA∶ZnSt2∶PE=1∶1∶3)are 2.7％and 6.2％respective-ly after 10 d of artificial UV aging,and the retention rates of tensile strength are 87.6％and 81.8％respectively after 35 d of natural light aging.The composite stabilizer improves the light stability of PVC best.The rare earth stabilizer can absorb the hydrogen chloride produced by PVC degradation,reduce the concentration of hydrogen chloride,so as to weaken the catalytic effect of hydrogen chloride on PVC degradation,inhibit PVC from remov-ing HCl to form double bonds,and prevent the double bonds from forming peroxides to form carbonyl com-pounds under the action of oxygen.
关键词
聚氯乙烯/热稳定剂/光稳定剂/二苯甲酮结构/稀土Key words
polyvinylchloride/heat stabilizer/light stabilizer/benzophenone structure/rare earths引用本文复制引用
基金项目
国家自然科学基金重点项目(51634005)
出版年
2024
NETL
NSTL
万方数据