POLYESTER INDUSTRY FILAMENT FOR INDUSTRIAL SEWING THREAD AND PREPARATION METHOD THEREOF

摘要

The invention relates to a polyester industry filament for an industrial sewing thread and a preparation method thereof. A modified polyester melt is subjected to solid phase polycondensation and viscosification, and a spinning process, so as to prepare a polyester industry filament for an industrial sewing thread. A method for preparing the modified polyester prior to the solid phase polycondensation and viscosification comprises: evenly mixing terephthalic acid, ethylene glycol, dibasic acid having a pendant tertiary-butyl group, dihydric alcohol having a pendant trimethylsilicon group, and Sb₂O₃ powder doped with and modified by a metal oxide, and then sequentially performing an esterification reaction and a condensation reaction. The dibasic acid having the pendant tertiary-butyl group is 5-tertiary-butyl-1,3-phthalic acid, 2-tertiary-butyl-1,6-adipic acid, 3-tertiary-butyl-1,6-adipic acid or 2,5-di-tert-butyl-1,6-adipic acid. The prepared polyester industry filament has a high dyeing rate and K/S value. The method of the invention is a simple process, and the polyester industry filament prepared thereby has good dyeability.