环氧脂肪酸多酯生物基增塑剂制备及其耐迁移性能

Preparation and migration resistance of epoxidized fatty acid multi-ester bio-plasticizer

为提高聚氯乙烯用环氧脂肪酸酯生物基增塑剂耐迁移性能,利用迈克尔加成反应,以较高产率在餐厨回收油源脂肪酸双酯α位引入第三个酯基,产物不提纯直接进行环氧化处理,制得环氧脂肪酸多酯生物基增塑剂。在此基础上,利用气相色谱-质谱、核磁共振技术,确定了产物组成和结构,并对比了环氧脂肪酸多酯、环氧脂肪酸双酯在聚氯乙烯中的耐迁移性能。结果显示,得益于第三个酯基引入,环氧脂肪酸多酯的耐挥发、耐渗出和耐萃取性能均优于邻苯二甲酸二(2-乙基己基)酯,这为聚氯乙烯用高性能生物基增塑剂结构设计与制备、餐厨回收油全组分高值利用提供了借鉴与参考。

To suppress leaching of epoxidized fatty acid ester bio-plasticizers in polyvinyl chloride matrix,a Michael addition reaction was performed to covalently attach one short ester at theα-position of waste cooking oil-derived fatty acid di-ester in relatively high yields.The resulting intermediate without purification was subjected to epoxidation,yielding a novel epoxidized fatty acid multi-ester bio-plasticizer.The composition and molecular structure of the engineered bio-plasticizer were determined by gas chromatography-mass spectrometry and 1H nuclear magnetic resonance.Then,leaching resistance of epoxidized fatty acid multi-ester and epoxidized fatty acid di-esters in polyvinyl chloride matrix was evaluated.The results demonstrate that attaching of the third ester group provide the epoxidized fatty acid ester with better resistance to volatilization,leaching and extraction to a level superior to that of di-(2-ethylhexyl)phthalate.The present efforts may provide guidance for other researchers in the molecular design and synthesis of high-performance polyvinyl chloride bio-plasticizers and all-component high-value utilization of waste cooking oil.