钠-A型分子筛对PVC热稳定性能影响研究  

Effect of sodium⁃A molecular sieve on heat stability of PVC

作　　者：杨笑春[1,2,3] 刘会媛 张青[1,2,3] 于静[1,2,4] YANG Xiaochun;LIU Huiyuan;ZHANG Qing;YU Jing(Department of Chemistry,Tangshan Normal University,Tangshan 063000,China;Hebei Key Laboratory of Degradable Polymers,Tangshan 063000,China;Tangshan Silicone Key Laboratory,Tangshan 063000,China;Tangshan Key Laboratory of Green Specialty Chemicals,Tangshan 063000,China)

机构地区：[1]唐山师范学院化学系,河北唐山063000 [2]河北省可降解聚合物重点实验室,河北唐山063000 [3]唐山市有机硅材料重点实验室,河北唐山063000 [4]唐山市绿色专用化学品重点实验室,河北唐山063000

出　　处：《中国塑料》2025年第2期77-81,共5页China Plastics

基　　金：唐山师范学院基金项目(2022C43)。

摘　　要：通过刚果红实验发现钠-A型分子筛能够提高聚氯乙烯(PVC)的热稳定性能,其静态热稳定时间可达72 min,明显优于纯PVC(静态热稳定时间7 min)。将钠-A型分子筛分别与β-二酮、季戊四醇、亚磷酸一苯二异辛酯和环氧大豆油4种辅助热稳定剂进行复配得到复合热稳定剂,采用刚果红试纸法、热老化烘箱法和转矩流变仪法测定复合热稳定剂对PVC的静、动态热稳定性能,通过热失重法分析复合热稳定剂对PVC降解过程的影响。结果表明,当钠-A型分子筛与β-二酮质量比为1/1复配时热稳定效果最佳,静态热稳定时间可达84 min,动态热稳定时间可达1 137 s,塑化时间最短为104 s,平衡扭矩最小为37.94 N·m。The thermal stability of poly(vinyl chloride)(PVC)could be improved by a sodium-A molecular sieve accord-ing to the Congo red experiment.The static thermal stability time of the modified PVC was increased up to 72 min,which was better than that of pure PVC(7 min).The sodium-A molecular sieve was compounded withβ-diketone,pen-taerythritol,phenyl diisooctyl phosphate and epoxidized soybean oil to obtain a compounding heat stabilizer.The static and dynamic thermal stability of the PVC stabilized with this compounding heat stabilizer was measured by using Congo red test paper,thermal aging oven,and torque rheometry methods,and its thermal weight loss was analyzed by thermo-gravimetry.The results indicated that the heat-stabilized PVC achieved the best thermal stabilization effect at a mass ratio of sodium-A molecular sieve toβ-diketone of 1/1,exhibiting a static thermal stabilization time of 84 min,a dynamic ther-mal stabilization time of 1137 s,a shortest plasticization time of 104 s,and a minimum equilibrium torque of 37.94 N·m.

关 键 词：聚氯乙烯 钠-A型分子筛 热稳定剂 

分 类 号：TQ314.245.1[化学工程—高聚物工业]