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High-strength activated polyester industrial yarn and preparation method thereof

A polyester industrial yarn, high-strength technology, applied in the field of polyester fibers, can solve the problems of high glass transition temperature, affecting the mechanical properties of activated polyester fibers, stress relaxation, etc. Effect

Active Publication Date: 2019-05-14
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the smooth surface of polyester and few surface active groups, although activation is effective, there is serious delamination between polyester industrial yarn and rubber, and the service life is short.
[0005] Since the finished polyester fiber has a partially crystalline supramolecular structure, the molecular chains of the crystalline parts are parallel to each other, and most of them are in the trans conformation, while the amorphous region is mostly in the cis conformation, and the molecules are arranged very closely. At the same time, the glass transition temperature of polyester Higher, in the process of industrial yarn activation, it needs to be treated at higher temperature and longer time, which will cause stress relaxation in the process and affect the mechanical properties of activated polyester fiber

Method used

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  • High-strength activated polyester industrial yarn and preparation method thereof
  • High-strength activated polyester industrial yarn and preparation method thereof
  • High-strength activated polyester industrial yarn and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The preparation method of high-strength type activated polyester industrial yarn, the steps are as follows:

[0054] (1) prepare modified polyester;

[0055] (1.1) Synthesis of 2,2,5,5-tetramethyl-3,4-hexanediol, the method is as follows: first, the molar ratio of 2,2-methylpropanal and sulfuric acid is 1.5:1 2,2-Methylpropionaldehyde solution with a concentration of 320g / L and dilute sulfuric acid solution with a concentration of 200g / L are mixed and added to the cathodic electrolytic cell, and then the mixed solution is cooled to 12°C, followed by electrolytic reduction to 2,2 -The concentration of methapropanal is 9.5wt%, and finally cooling crystallization, separation and purification are carried out, and the schematic diagram of the reaction device adopted in the synthesis process is as follows figure 1 As shown, the reaction chemical equation is as follows:

[0056]

[0057] The structural formula of the prepared 2,2,5,5-tetramethyl-3,4-hexanediol is shown in...

Embodiment 2

[0074] The preparation method of high-strength type activated polyester industrial yarn, the steps are as follows:

[0075] (1) prepare modified polyester;

[0076] (1.1) Synthetic 2,2,5,5-tetramethyl-3,4-diethyl-3,4-hexanediol, the method is: at first, press 2,2-dimethyl 3-pentanone and The molar ratio of sulfuric acid is that the ratio of 1.6:1 concentration is that the 2,2-dimethyl 3-pentanone solution of 350g / L and the dilute sulfuric acid solution of 210g / L are mixed and added in the cathodic electrolytic cell, then, the mixed Liquid cooling to 11 ° C, followed by electrolytic reduction to a concentration of 9.0 wt% of 2,2-dimethyl-3-pentanone, and finally cooling crystallization, separation and purification, the reaction device used in the synthesis process and the reaction chemical equation Consistent with Example 1, the structural formula of the prepared 2,2,5,5-tetramethyl-3,4-diethyl-3,4-hexanediol is shown in formula (I), where R for -CH 2 CH 3 ;

[0077] (1.2)...

Embodiment 3

[0088] The preparation method of high-strength type activated polyester industrial yarn, the steps are as follows:

[0089] (1) prepare modified polyester;

[0090] (1.1) Synthesis of 2,2,4,4-tetramethyl-3,4-di-tert-butyl-3,4-hexanediol, the method is: first, according to 2,24,4-tetramethyl 3- The molar ratio of pentanone to sulfuric acid is 1.7:1. Mix the 2,24,4-tetramethyl-3-pentanone solution with a concentration of 340g / L and the dilute sulfuric acid solution with a concentration of 230g / L into the cathode electrolytic cell , and then, the mixed solution was cooled to 10°C, followed by electrolytic reduction to a concentration of 9.6 wt% of 2,24,4-tetramethyl-3-pentanone, and finally cooled crystallization, separation and purification, using the The reaction device and reaction chemical equation are consistent with embodiment 1, and the structural formula of the 2,2,4,4-tetramethyl-3,4-di-tert-butyl-3,4-hexanediol that makes is as formula (Ⅰ ), where R is -C(CH 3 ) 3 ;...

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Abstract

The invention relates to high-strength activated polyester industrial yarn and a preparation method thereof. The preparation method comprises the steps: firstly, terephthalic acid, ethylene glycol andethylene glycol with tertiary butyl side groups are evenly mixed, and then an esterification reaction and a polycondensation reaction are carried out successively to prepare modified polyester; and then the modified polyester is subjected to solid phase polycondensation tackifying, fusing, metering, extruding, cooling, oil applying, stretching, heat setting, activating oil agent applying, windingand pre-activating treatment, and then the high-strength activated polyester industrial yarn is prepared. The structural formula of the ethylene glycol with the tertiary butyl side groups is as followings: (please see the specifications for the structural formula), wherein R in the formula is -H or -CH2CH3 or -C(CH3)3. The activating efficiency of the finally prepared high-strength activated polyester industrial yarn is high; the preparation method is simple, the polyester is modified through the ethylene glycol with the tertiary butyl side groups, the using efficiency of an activating agentis improved, the activating temperature is lowered, the activating time is shortened, and the influences of activating on mechanical properties of polyester fibers are lowered; and a prepared productis good in activating effect and mechanical property.

Description

technical field [0001] The invention belongs to the technical field of polyester fibers, and relates to a high-strength activated polyester industrial 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. Or the fiber-forming high polymer prepared by transesterification and polycondensation reaction - polyethylene terephthalate (PET), the fiber made by spinning and post-processing. Since its inception, PET fiber has a series of excellent properties such as breaking strength and elastic modulus, moderate resilience, excellent heat setting, good heat resistance and light resistance, acid resistance, alkali resistance and corrosion resistance, and is widely used in industries and automobiles. [0003] Activated polyester industrial filament has the advantages of high breaking strength, small elongation at break, and stable dry heat shrinkage; however,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/92D01F1/10C08G63/183C08G63/86D02J1/08D02J1/22D02J13/00
Inventor 王山水汤方明赵慧荣
Owner JIANGSU HENGLI CHEM FIBER
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