A kind of preparation method of superfine denier polyester fdy yarn for high-density fabric

Abstract

The invention relates to a preparation method of superfine polyester FDY yarns for high density fabric. The preparation method comprises the following steps: firstly mixing dimethyl isophthalate-5-sodium benzenesulfonate, glycol and a catalyst, then performing ester interchange reaction, adding glycol, sodium glycol and sulfuric acid to be blended after reaction, mixing terephthalic acid, glycol,a catalyst and a stabilizer and performing esterification reaction, adding a product formed by blending after ester exchange reaction into a reaction system reaching an esterification reaction end point to be subjected to polycondensation reaction, so as to obtain spinning melt, and finally performing measuring, extruding, cooling, oil applying, stretching, heat setting and coiling on the spinningmelt, so as to obtain the superfine polyester FDY yarn for high density fabric. The method reduces impurities produced during the production of the polyester FDY yarns, thereby reducing the pressurerise of spinning components and a filter, prolongs the service cycle, guarantees the continuity and the safety of the whole production process, and has a good economic value and a popularization value.

Description

technical field [0001] The invention belongs to the field of polyester spinning, and relates to a method for preparing superfine denier polyester FDY yarns for high-density fabrics. Background technique [0002] High-density fabric refers to a type of fabric whose warp and weft yarn raw material yarn number is low and its warp and weft density is large. Fabric density can be divided into warp density and weft density. Generally, the finer the yarn count, the greater the possible density. Therefore, high-density fabrics are often based on the premise of high count. Permeable, belonging to the category of high-end fabrics. When dividing and defining fabrics according to the actual production of chemical fiber filament fabrics and their uses, it is customary to identify fabrics with a denier below 50D (55.5dtex) and a warp and weft density of 1200 threads / 10cm and above as high-count (low denier) and high-density fabrics. fabric. [0003] Polyester is generally used as a raw...

AI Technical Summary

Problems solved by technology

[0005] However, due to the addition of the third component in the CDP melt, its apparent viscosity is relatively large, and the impurities produced in the production process also increase accordingly, causing the pressure of some spinning components and the pressure difference of the filter to rise faster. There are carbonized cokes on the inner wall of the pipeline. These carbonized cokes adhere to the inner wall of the pipeline, which is easy to cause blockage of the pipeline system and is not easy to be removed, which brings great difficulties to the dredging of the pipeline. In addition, in the production of this kind of fiber In the process, the service life of the filter is greatly reduced, generally only one week, while the service life of some other spinning components is generally only 10 days, so frequent cleaning and replacement of the spinning components are required, which will not only increase the operating cost, but also Will affect the continuity and safety of the entire production process