摘要
本文将偏三甲苯制备偏苯三酸酐产生的偏酐重组分(黑渣)与甲醇经过酯化反应得到一系列甲酯,然后对甲酯进行精馏分离,将得到的二甲酯和三甲酯与2-乙基己醇进行酯交换得到二(2-乙基)己酯和(2-乙基)辛酯.进行分离后获得两种偏苯三甲酸三(2-乙基)己酯和一种均苯三甲酸三(2-乙基)己酯.将两种不同的偏苯三甲酸三(2-乙基)己酯和均苯三甲酸三(2-乙基)己酯以及正常合成的偏苯三甲酸三(2-乙基)己酯与常见增塑剂增塑的PVC薄膜的热稳定性、力学性能和相容性等应用性能进行对比.结果表明,偏苯三甲酸三(2-乙基)己酯和均苯三甲酸三(2-乙基)己酯具有良好的增塑性能和热稳定性.
Abstract
This study presents a series of methyl esters obtained by esterification of the heavy component(black residue)of trimellitic anhydrides produced by the preparation of trimellitic anhydrides from 1,2,4-Trimethyl benzene with methanol.The methyl esters are then separated by distillation,and the resulting dimethyl and trimethyl esters are exchanged with 2-Ethylhexanol to bis(2-ethylhexyl)ester and tri(2-ethylhexyl)esters.Two kinds oftris(2-ethylhexyl)benzene-1,2,4-tricarboxylate and one kind of tris(2-ethylhexyl)benzene-1,3,5-tricarboxylate were obtained after separation.The thermal stability,mechanical properties,and compatibility of two different kinds of tris(2-ethylhexyl)benzene-1,2,4-tricarboxylate and one kind of tris(2-ethylhexyl)benzene-1,3,5-tricarboxylate and normally synthesized tris(2-ethylhexyl)benzene-1,2,4-tricarboxylate plasticizer plasticized PVC films were compared.The results indicate that tris(2-ethylhexyl)benzene-1,2,4-tricarboxylate and tris(2-ethylhexyl)benzene-1,3,5-tricarboxylate have good plasticizer properties and thermal stability.
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