In this work, a non-volatile solid organotin thermal stabilizer, pentaerythritol stearate ester-based tin (II) metal alkoxides (PSE-Sn) was synthesized with a very simple process and its impact on the thermal stability and processing performance of PVC was evaluated by conductivity measurement, thermal aging, thermogravimetric analysis, and torque rheometer test. The results showed that the addition of PSE-Sn not only could significantly enhance the thermal stability of PVC, accelerate plasticization, but also improve lubrication performance during PVC processing. Thus, PSE-Sn played the role of tri-functional additives: thermal stabilizer, plasticizer, and lubricant. The joint effects of PSE-Sn with ZnSt₂ and CaSt₂ on the thermal stability of PVC were also evaluated. Results indicate that there is a good synergistic effect between PSE-Sn and ZnSt₂ on the initial color and long-term thermal stability of PVC. However, such synergistic effect was not observed between PSE-Sn and CaSt₂. In addition, the working mechanism of PVC stabilization by PSE-Sn was also explored. Furthermore, the thermal stability and processing performance of PSE-Sn and methyl tin mercaptide (MTM) on PVC were comparatively tested. PVC stabilized by MTM possessed the longest color stability. The addition of PSE-Sn could also improve the initial color stability and long-term thermal stability of PVC significantly. The results of tensile test showed that both PSE-Sn and MTM could reduce the average tensile strength of PVC but increase the average elongation at break of PVC.

在这项工作中，以非常简单的方法合成了一种非挥发性固体有机锡热稳定剂，季戊四醇硬脂酸酯基锡（II）金属醇盐（PSE-Sn），并评估了其对PVC的热稳定性和加工性能的影响。通过电导率测量，热老化，热重分析和扭矩流变仪测试。结果表明，添加PSE-Sn不仅可以显着提高PVC的热稳定性，加速塑化，还可以提高PVC加工过程中的润滑性能。因此，PSE-Sn起到了三功能添加剂的作用：热稳定剂，增塑剂和润滑剂。PSE-Sn与ZnSt ₂和CaSt ₂的联合作用还评估了PVC的热稳定性。结果表明，PSE-Sn和ZnSt ₂对PVC的初始颜色和长期热稳定性具有良好的协同作用。但是，在PSE-Sn和CaSt ₂之间未观察到这种协同作用。。另外，还探讨了PSE-Sn稳定PVC的作用机理。此外，还对PSE-Sn和甲基锡硫醇盐（MTM）在PVC上的热稳定性和加工性能进行了比较测试。MTM稳定的PVC具有最长的颜色稳定性。加入PSE-Sn还可以显着提高PVC的初始颜色稳定性和长期热稳定性。拉伸试验结果表明，PSE-Sn和MTM均可降低PVC的平均拉伸强度，但增加了PVC的平均断裂伸长率。