Method for preparing floating flax-like polyester fibers

Abstract

The invention relates to a method for preparing floating flax-like polyester fibers. The method comprises the following steps: preparing modified polyester POY yarns from modified polyester melt according to a POY process, processing the yarns according to a DTY process, arranging a trench-breaking roller and a variable frequency shifter between a zero roller and a first roller of DTY equipment, enabling modified polyester tows to pass through the surface of the trench-breaking roller, and dyeing, thereby obtaining the floating flax-like polyester fibers. The preparation method of the modifiedpolyester comprises the following steps: uniformly mixing terephthalic acid, ethylene glycol and 2,5,6,6-tetramethyl-2,5-heptandiol, and sequentially carrying out an esterification reaction and a condensation polymerization reaction so as to prepare modified polyester. The trench-breaking roller is a roller on the peripheral surface of which multiple ring grooves are formed; the variable frequency shifter is used for driving the polyester POY yarns to make a reciprocating motion on the peripheral surface of the trench-breaking roller along a center shaft of the roller; and the movement cycleof the variable frequency shifter is 5-99 reciprocal times per minute. The method disclosed by the invention is easy to operate, and the prepared fiber is excellent in dyeing property and air permeability and has excellent application prospects.

Description

technical field [0001] The invention belongs to the technical field of polyester fibers, and relates to a method for preparing a deep-floating hemp-like polyester fiber. Background technique [0002] Since the industrial production of polyester fiber, due to its high strength, good elasticity, excellent heat resistance and chemical resistance and excellent dimensional stability, it is widely used as textile raw materials, which largely relieves the natural The shortage of fibers has greatly promoted the development of the textile market. With the continuous development of society and the continuous improvement of people's consumption level, people put forward higher requirements for clothing. The differentiation and high-end of polyester fiber is an inevitable choice for the market. [0003] Compared with natural fiber fabrics, synthetic fiber fabrics are dull to wear, have poor air permeability, and lack wearing comfort. In recent years, people have studied the properties...

AI Technical Summary

Problems solved by technology

However, the method for preparing slub silk in the prior art does not have obvious color contrast in the depth of the fiber, which limits the development of slub silk to a large extent.

[0004] Furthermore, polyester is a hydrophobic fiber, the molecule does not contain hydrophilic groups, and its molecular structure also lacks active groups that can combine with dyes. The dyeing performance of polyester fibers is not good.

In addition, the finished polyester fiber has a partially crystalline supramolecular structure, and its crystalline molecular chains are parallel to each other, mostly in a trans conformation, while the amorphous region is mostly in a cis conformation, and its molecules are arranged quite closely, which further increases the Dyeing Difficulty of Polyester Fiber

Conventional PET fibers are generally dyed with disperse dyes, which usually need to be dyed under high temperature (greater than 130°C) and high pressure. In addition to increasing the complexity of the process, this method has high requirements for equipment, high production costs, and poor dyeing performance.

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