Polyester staple fibers and preparation method thereof

Abstract

The invention provides polyester staple fibers and a preparation method thereof, and belongs to the technical field of polyester fibers. Polyethylene terephthalate contains a nucleating agent nano barium sulfate, the particle size of the nano barium sulfate is less than or equal to 100 nm, the concentration of the nano barium sulfate in the polyethylene terephthalate is 10-1000 ppm, and the specification of the staple fibers is 0.90-1.60 dtex*38 mm; nano polyethylene terephthalate composite is prepared by esterification and polycondensation of nano barium sulfate ethylene glycol suspension anda polyester monomer, and the nucleating agent nano barium sulfate is added in the form of ethylene glycol suspension before esterification, or before polycondensation after esterification. The polyester monomer is pure terephthalic acid, ethylene glycol or medium purity terephthalic acid. The special polyester staple fibers for sewing threads are low in production cost, good in glossiness, high in strength and low in dry heat shrinkage rate, and can meet the requirements of sewing thread spinning process and dyeing and finishing processing.

Description

technical field [0001] The invention relates to the field of textiles, in particular to a method for preparing polyester staple fibers. Background technique [0002] At present, in order to meet the speed of high-speed lockstitch sewing machines, it is required that the sewing thread has high strength, uniform dryness, smooth spinning, few defects, and small and few knots, so as to obtain good sewing results. In recent years, my country's textiles have entered the international market competition, and the quality of high-speed sewing thread directly affects the quality of clothing and production efficiency. 0.90dtex~1.60dtex×38mm glossy high-strength low-elongation polyester staple fiber is the main raw material for spinning high-speed sewing thread. Due to the difficulty in reaching or meeting its quality indicators, low product qualification rate, and large quality fluctuations, etc., although Some domestic products have been put on the market, but there are disadvantages ...

AI Technical Summary

Problems solved by technology

0.90dtex~1.60dtex×38mm glossy high-strength low-elongation polyester staple fiber is the main raw material for spinning high-speed sewing thread. Due to the difficulty in reaching or meeting its quality indicators, low product qualification rate, and large quality fluctuations, etc., although Some domestic products have been put on the market, but there are disadvantages such as high cost and lower quality than similar foreign products. Therefore, my country has long relied heavily on imports for such products.