Low-shrinkage polyester drawn yarn and preparation method thereof

A polyester drawn yarn, low shrinkage technology, applied in the field of modified polyester fibers, can solve the problems of increasing process complexity, restricting grain growth, and high equipment requirements, shortening dyeing time, improving dyeing performance, reducing The effect of dyeing temperature

Active Publication Date: 2019-05-07
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing technology can also produce low-shrinkage polyester civilian yarn by controlling the overfeed rate and performing tension heat setting, the length of the fiber is fixed and cannot be changed during the tension heat setting process, which will inhibit the folding of the macromolecular chain and limit the crystallinity. The growth of grains leads to defects in crystallization, which will affect the heat shrinkage recovery performance of polyester filaments (high heat shrinkage rate)
[0005] In addition, because polyester is a hydrophobic fiber, its molecules do not contain hydrophilic groups, and its molecular structure also lacks active groups that can combine with dyes, so 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 fiber is usually dyed with disperse dyes, usually under high temperature (greater than 130°C) and high pressure. In addition to increasing the complexity of the process, this method requires high equipment, high production costs, and poor dyeing effect.

Method used

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  • Low-shrinkage polyester drawn yarn and preparation method thereof
  • Low-shrinkage polyester drawn yarn and preparation method thereof
  • Low-shrinkage polyester drawn yarn and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The preparation method of low-shrinkage polyester drawn yarn, the steps are as follows:

[0075] (1) prepare modified polyester;

[0076] (1.1) Esterification reaction;

[0077] Make a slurry of terephthalic acid, ethylene glycol, 3-trimethylsilyl-1,2-propanediol and 5-tert-butyl-1,3-phthalic acid, add antimony trioxide, titanium dioxide and triphosphate After the phenyl ester is mixed evenly, carry out the esterification reaction under pressure in a nitrogen atmosphere, the pressurized pressure is normal pressure, and the temperature of the esterification reaction is 250°C. As the end point of the esterification reaction, the molar ratio of terephthalic acid to ethylene glycol is 1:2.1, the addition of 3-trimethylsilyl-1,2-propanediol and 5-tert-butyl-1,3-phthalic acid The sum of the amounts is 4mol% of the added amount of terephthalic acid, the molar ratio of 3-trimethylsilyl-1,2-propanediol and 5-tert-butyl-1,3-phthalic acid is 1:3, di The addition of antimony, ti...

Embodiment 2

[0094] The preparation method of low-shrinkage polyester drawn yarn, the steps are as follows:

[0095] (1) prepare modified polyester;

[0096] (1.1) Preparation of 2-tert-butyl-1,6-hexanedicarboxylic acid: firstly mix tungstic acid and hydrogen peroxide, stir at room temperature for 10 minutes, then add 2-tert-butylcyclohexanol and firstly mix at 80°C React for 1 hour, then raise the temperature to 94°C and react for 2 hours. During the reaction, the reactants are always in a reflux state, and finally undergo cooling crystallization, washing and refining. The ratio is 1:35:120;

[0097] (1.2) Esterification reaction;

[0098] Make a slurry of terephthalic acid, ethylene glycol, 3-trimethylsilyl-1,2-propanediol and 2-tert-butyl-1,6-hexanedicarboxylic acid, add antimony trioxide, titanium dioxide and phosphorous acid After the trimethyl ester is mixed evenly, the esterification reaction is carried out under pressure in a nitrogen atmosphere. The pressurized pressure is 0.3M...

Embodiment 3

[0107] The preparation method of low-shrinkage polyester drawn yarn, the steps are as follows:

[0108] (1) prepare modified polyester;

[0109] (1.1) Preparation of 2-tert-butyl-1,6-hexanedicarboxylic acid: firstly mix tungstic acid and hydrogen peroxide, stir at room temperature for 12 minutes, then add 2-tert-butylcyclohexanol and firstly mix at 83°C React for 1.5 hours, then raise the temperature to 90°C and react for 2 hours. During the reaction, the reactants are always in a reflux state, and finally carry out cooling crystallization, washing and refining. The molar ratio is 1:33:120;

[0110] (1.2) prepare dihydric alcohols with trimethylsilyl side groups;

[0111] (a) Mix 3-trimethylsilyl-3-methylpropene, peracetic acid and dichloromethane at a molar ratio of 1:5:10, and react at a temperature of 35°C for 5 hours, with stirring during the reaction. After the end, the solvent is removed, and trimethylsilylpropylene epoxide is obtained through purification and refinin...

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Abstract

The invention relates to a low-shrinkage polyester drawn yarn and a preparation method thereof. The preparation method comprises the steps that modified polyester is processed according to an FDY process, a relaxation heat treatment process is added between a tension heat setting process and a winding process, and then the low-shrinkage polyester drawn yarn is obtained; a preparation method of modified polyester comprises the steps that terephthalic acid, ethylene glycol, dihydric alcohol with a trimethylsilyl side group and binary acid with a tertiary butyl side group are mixed to be uniform,and then an esterification reaction and a condensation polymerization are conducted in sequence. The boiling water shrinkage of the prepared low-shrinkage polyester drawn yarn is 3.0+ / -0.5%, the dye-uptake is 86.3-89.8% at 125 DEG C, and the K / S value is 22.32-24.34. The preparation method has the advantages of being simple in process and low in cost, and the dyeing performance and heat shrinkageof the low-shrinkage polyester drawn yarn are low.

Description

technical field [0001] The invention belongs to the technical field of modified polyester fibers, and relates to a low-shrinkage polyester drawn yarn and a preparation method thereof. Background technique [0002] Polyester is the trade name of polyester fiber in my country, and it is an important variety in synthetic fibers. It is a fiber-forming high polymer prepared from purified terephthalic acid (PTA) or dimethyl terephthalate (DMT) and ethylene glycol (EG) through esterification or transesterification and polycondensation reactions— Polyethylene terephthalate (PET) fibers made by spinning and post-processing. With the expansion of polyester production scale, its production technology has also been greatly improved. From the initial production of conventional products, it has gradually developed to the production direction of high-tech, functional and differentiated fibers. The application of polyester fibers The field has also gradually developed from the initial clo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/92D01F1/10C08G63/695C08G63/86
Inventor 王丽丽王雪孙晓华
Owner JIANGSU HENGLI CHEM FIBER
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