Preparation method of polyester staple fiber

Abstract

The invention aims to provide a method for preparing polyester staple fiber. The invention is characterized in that the method adopts the process route of directly spinning melt mass to manufacture, and uses purified terephthalic acid (PTA) and ethylene glycol (EG) as raw materials and adds small quantities of mono-pentaerythritol, DEG, antimony trioxide, titanium dioxide and other catalysts, flatting agents and stabilizing agents. The method uses the process flow of five autoclaves polymerization to perform polyreaction so as to receive the melt which is finally spun into tows, and prepares the polyester staple fiber via primary drawing, secondary drawing, 18 roller tension heat setting, third drawing, crimping, relaxation heat setting and cutting. The method has the advantages of stable raw material supply, high product strength, few defects, good crimp, moderate oil applying rate and stable dry-heat shrinkage percentage; products prepared by the method have good spinnability, so that yarn spun by the product is high in each quality index, and produced textile has soft and smooth hand feeling; and the manufacturing cost is lower than chip spinning, so that the marketing competitive power of the products is stronger.

Description

technical field

[0001] The invention relates to a preparation method of polyester staple fiber, which belongs to the technical field of chemical fiber. Background technique

[0002] Polyester staple fiber is widely used in high-end clothing, leather products, medical surgery, military supplies and many other fields due to its high strength, good durability, corrosion resistance and mildew resistance.

[0003] At present, the method of domestic production of polyester staple fiber mainly adopts the chip spinning process route, which is finally obtained through spinning, drawing, cutting, drying and other processes. The typical process example is: polyester with an intrinsic viscosity of 0.63-0.65 Melt spinning, the spinning process speed is between 1100 and 1250 m / min; the prepared raw yarn adopts two drafts, and is made by adjusting the temperature of the water bath, the steam box, and the ratio of the first and second draw ratios. Take medium-strength low-stretch polyester...