High-value Added Application of Synthesizing Benzoic Acid Ester Plasticizers from Residual Anhydrides
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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