A kind of flat polyester fiber fdy yarn and preparation method thereof

Abstract

The invention relates to a flat polyester fiber FDY (Fully Drawn Yarn) and a preparation method thereof. The spinning melt comprises a saturated fatty acid metal salt and polyester, wherein a mass ratio of the saturated fatty acid metal salt to polyester is (0.0005-0.002):1; the filtered pressure during spinning is 84-126kg / cm<2>; a die-swell ratio of the spinning melt is 1.22-1.34; and the saturated fatty acid metal salt refers to a fatty acid metal salt with the carbon atom number of 12-22, the melting point of 100-180 DEG C and the dynamic viscosity of less than or equal to 1Pa.s. The saturated fatty acid metal salt is added into the spinning melt, and the filtered pressure and extrudate swelling during spinning can be effectively reduced, so that the product has an excellent shape preserving effect; meanwhile, the saturated fatty acid metal salt can serve as a nucleating agent, so that the fiber curing speed is increased, and the fiber shape preserving effect is improved. In addition, the fiber structure regularity is not greatly damaged by the saturated fatty acid metal salt, and excellent performances of the polyester fibers are maintained.

Description

technical field [0001] The invention belongs to the field of polyester fibers, and in particular relates to a flat polyester fiber FDY filament and a preparation method thereof. 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 ...

AI Technical Summary

Problems solved by technology

[0006] 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 flat polyester fiber FDY filament and a preparation method thereof. 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 little effect on the regularity of polyester fibers The destruction of the polyester fiber maintains the excellent performance of the polyester fiber. Its refractive index is 1.49, which is lower than that of polyester 1.52-1.54, and does not affect the final transparency of the product.

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