WOOL-LIKE POLYESTER FILAMENT AND PREPARATION METHOD THEREFOR

摘要

The present invention relates to a wool-like polyester filament and a preparation method therefor. The method comprises: first, uniformly mixing terephthalic acid, 1,4-butanediol, a fluorine-containing diacid, hexanediol having a tertiary butyl side group, and 2,5,6,6-tetramethyl-2,5,-heptanediol; then sequentially performing an esterification reaction and a polycondensation reaction to prepare a modified polyester; preparing a modified polyester POY filament from a modified polyester melt according to a POY process; finally, preparing a modified polyester DTY filament, i.e., the wool-like polyester filament, from the modified polyester POY filament according to a DTY process. The dye uptake of a prepared product is 90.32-93.27% under the temperature of 100°C, and a K/S value is 22.15-23.42; after being placed at the temperature of 25°C and the relative humidity of 65% for 60 months, the intrinsic viscosity of the product decreases by 17-20%. By means of the preparation method of the present invention, the present invention is low in cost and simple in process; the prepared product has an excellent dyeing property and a fast natural degradation rate, and has great application prospects.