Polyester spinning method capable of reducing extrusion swelling ratio

Abstract

The invention relates to a polyester spinning method capable of reducing extrusion swelling ratio. A spinning melt comprises a saturated fatty acid metal salt and modified polyester according to a mass ratio of (0.0005 to 0.002) to 1; the extrusion swelling ratio of the spinning melt is 1.20 to 1.32; the saturated fatty acid metal salt is a fatty acid metal salt with carbon atom number of 12 to 22, melting point of 100 to 180 DEG C, and dynamic viscosity less than or equal to 1Pa.s. The polyester spinning method has the advantages that by adding the saturated fatty acid metal salt into the spinning melt, which is equivalent to adding a lubricant, the post-filtering pressure during spinning is reduced, the exit swelling is effectively reduced, and a product has good shape preserving effect; the saturated fatty acid metal salt can be used as a nucleating agent, so that the curing speed of fibers is accelerated, and the shape preserving effect of the fibers is further improved; the saturated fatty acid metal salt has no great damage to the regularity of the polyester fiber structure, and the self excellence property of the polyester fiber is maintained.

Description

technical field [0001] The invention belongs to the field of polyester fibers, in particular to a polyester spinning method for reducing the extrusion swell ratio. Background technique [0002] Polyethylene terephthalate fiber (PET fiber or polyester fiber) has a series of high breaking strength and elastic modulus, moderate resilience, excellent heat setting, good heat resistance and light resistance, acid resistance, alkali resistance and corrosion resistance. Excellent performance, and the fabric has the advantages of anti-wrinkle, non-ironing, good crispness, etc., and is widely used in clothing, home textiles and other fields. However, polyethylene terephthalate fibers also have disadvantages such as poor hygroscopicity, non-absorbent fabric, stuffy feeling when worn, and difficult coloring, which greatly restricts the application and development of polyethylene terephthalate fibers. People have been devoting themselves to the research and development of polyester fibe...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that the extrusion expansion ratio is too large and the shape retention effect of the product is not good during the existing polyester fiber melt spinning, and to provide a polyester spinning method that reduces the extrusion expansion ratio. The present invention The saturated fatty acid metal salt is added to the spinning melt, which is equivalent to adding a lubricant, which can effectively reduce the post-filtration pressure during spinning, thereby effectively reducing the outlet expansion, that is, weakening the extrusion swell ratio, so that the product has a good shape-retaining effect; at the same time, saturated fatty acid metal salts can also be used as nucleating agents to promote the crystallization of polyester fibers, increase the curing speed of fibers, and further improve the shape-retaining effect of fibers; in addition, saturated fatty acid metal salts have no effect on the regularity of polyester fibers Large damage, maintaining the excellent performance of polyester fiber, its refractive index is 1.49 less than that of polyester 1.52-1.54, and has no effect on the final transparency of the product