油酸锌/脲嘧啶复合热稳定剂对PVC性能的影响  

Influence of Zinc Oleate/Uracil Composite Heat Stabilizer on Properties of PVC

作　　者：宋莉芳[1] 李开元 黄卓辰 霍慧文 夏慧芸[1] 牛艳辉 SONG Lifang;LI Kaiyuan;HUANG Zhuochen;HUO Huiwen;XIA Huiyun;NIU Yanhui(School of Materials Science and Engineering,Chang'an University,Xi'an,Shaanxi 710061,China)

机构地区：[1]长安大学,材料科学与工程学院,陕西西安710061

出　　处：《塑料》2024年第1期42-47,共6页Plastics

基　　金：长安大学中央高校基本科研业务费专项资金(300102310301);大学生创新创业训练计划(G202210710085)。

摘　　要：为了改善软质聚氯乙烯(PVC)的初始白度和长期热稳定性,制备由具有不饱和链的油酸锌和含氨基的脲嘧啶(6-氨基-1,3-二甲基脲嘧啶,DAU)组成的复合热稳定剂,添加合适的辅助稳定剂和增塑剂,进行聚氯乙烯热加工。采用刚果红试验法和干燥箱热老化试验法分析复合稳定剂对PVC静态热稳定性的影响;采用转矩流变测试评价其对PVC动态热稳定性的影响;利用红外光谱法研究复合稳定剂的热稳定机理。结果表明,油酸锌与脲嘧啶复合后,稳定剂与PVC的相容性提高,初始白度得到改善;复合稳定剂中DAU与油酸锌(DAU/Zn)的最佳比例为4∶1,长期热稳定性可达100 min;另外,加入辅助稳定剂和增塑剂使PVC的热稳定效果得到进一步改善。In order to improve the initial whiteness and long-term thermal stability of soft polyvinyl chloride(PVC),zinc oleate with unsaturated chains and uracil containing amino groups(6-amino-1,3-dimethyluracil,DAU)was composed of a composite heat stabilizer.The appropriate amount of auxiliary stabilizer and plasticizers was used additional for the processing of polyvinyl chloride.The effect of composite stabilizer on static thermal stability of PVC was investigated by Congo red test and drying oven heat aging test.The dynamic thermal stability of PVC was evaluated by torque rheology test.The thermal stability mechanism of the composite stabilizer was studied by infrared spectroscopy.The results showed that the compatibility of the stabilizer with PVC was improved by introducing zinc oleate and uracil.The initial whiteness was improved also.When the optimal ratio of DAU/zinc oleate(DAU/Zn)was determined to be 4∶1,the long-term thermal stability could reach 100 min.It was found that the appropriate amounts of plasticizers and auxiliary heat stabilizer could improve the thermal stability of PVC.

关 键 词：聚氯乙烯 油酸锌 脲嘧啶 热稳定性 热稳定机理 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]