环氧大豆油-癸二酸低分子量聚酯对PVC增塑性能的研究  

Plasticizing effect of low molecular weight polyesters synthesized from epoxidized soybean oil for poly(vinyl chloride)

作　　者：杨洋[1] 韩宇 翁云宣[1] 宋鑫宇 黄志刚[1] 张彩丽 YANG Yang;HAN Yu;WENG Yunxuan;SONG Xinyu;HUANG Zhigang;ZHANG Caili(Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics,College of Chemistry and Materials Engineering,Beijing Technology and Business University,Beijing 100048,China)

机构地区：[1]北京工商大学化学与材料工程学院,塑料卫生与安全质量评价技术北京市重点实验室,北京100048

出　　处：《中国塑料》2023年第11期87-94,共8页China Plastics

基　　金：国家重点研发计划(2019YFD1101201、2022YFB3704900);北京市属高校教师队伍建设支持计划优秀青年人才项目(BPHR202203050);北京市科协2023-2025年青年人才托举工程(BYESS2023052);国家自然科学基金项目(52073004、32172277)。

摘　　要：将环氧大豆油(ESO)与癸二酸(SA)进行开环固化反应,通过控制反应时间得到3种不同分子量的环氧大豆油-癸二酸低分子聚酯(ESO-SA_(5)、ESO-SA_(9)和ESO-SA_(13)),并对其化学结构进行了表征;再以ESO-SA_(n)为增塑剂,研究其分子量和添加量对聚氯乙烯(PVC)增塑效果、热性能及力学性能的影响;此外,对比了不同成型方式(溶剂流延膜和熔融压制膜)对PVC增塑膜性能的影响;最后,分析了热稳定剂的加入对熔融压制膜性能的影响。研究表明,不同成型方式制备的PVC增塑膜中,均为添加30份ES0-SA_(9)的增塑膜具有最好的性能,包括增塑效果、力学性能(断裂伸长率269.6%,拉伸强度28.7 MPa)及热性能(初始热分解温度284.3℃)等;熔融压制使PVC与增塑剂分子之间能到达更好的混合效果,可实现分子水平的混合;由于钙锌稳定剂与基体的相容性较差且同时破坏了ESO-SA_(n)在PVC中形成的增塑网络结构,热稳定剂的加入反而导致增塑膜的力学性能及热性能等出现一定程度的降低。The epoxide functional groups of epoxidized soybean oil(ESO)were cross-linked with succinic acid(SA)through a ring opening reaction,and three types of epoxidized soybean oil-succinic acid copolymers(ESO-SA_(5),ESO-SA_(9) and ESO-SA_(13))with different molecular weights were obtained through regulating the reaction time,and their chemical structures were characterized.The thermal and mechanical properties of poly(vinyl chloride)(PVC)modified by using ESO-SA_(n) as a plasticizer were studied,and the effects of the molecular weight and addition amount of ESO-SA_(n) on the plasticizing effect were investigated.In addition,the effect of molding method(solvent casting film and melt pressing film)on the properties of plasticized PVC film was compared.Finally,the effect of thermal stabilizer on the properties of melt-pressing film was investigated.The results indicated that among the plasticized films prepared by different molding methods,the plasticized film containing 30 phr ESO-SA_(9) exhibited the best performance,including plasticizing effect,mechanical properties(elongation at break of 269.6% and tensile strength of 28.7 MPa),and thermal properties(initial thermal degradation temperature of 284.3℃).A better mixing effect between the PVC and plasticizer at a molecular level could be achieved.Owing to the poor compatibility between calcium-zinc stabilizer and matrix as well as the destruction of the plasticizing network structure formed by ESO-SA_(n) in PVC,the addition of thermal stabilizer resulted in a decrease to some extent in the mechanical and thermal properties of the plasticized films.

关 键 词：聚氯乙烯 环氧大豆油 生物基增塑剂 低分子量聚酯 

分 类 号：TQ314.24[化学工程—高聚物工业]