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Polyester fibres and preparation method thereof

A polyester fiber and modified polyester technology, applied in the field of polyester fiber, can solve the problems of small increase in free volume, unfavorable processing, low dyeing rate, etc., to reduce melt viscosity, improve processing performance, and increase diffusion. degree of effect

Active Publication Date: 2017-02-01
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the molecular chains of PET are regular, the crystallinity is good, the molecular chains are closely arranged, and there are no polar groups that interact with dye molecules on the molecular chains, which makes the coloring of PET fibers more difficult.
[0005] Therefore, the usual dyeing of PET fibers is generally under high temperature and high pressure, and disperse dyes are selected for dyeing. When the temperature reaches above the glass transition temperature of PET fibers, the inter-molecular gaps of PET fiber polymers increase, but the degree of free volume increase is small, and dyeing The rate is not high. Therefore, the energy consumption and low dyeing rate brought by the high temperature and high pressure method are the main problems now.
In addition, the melt viscosity of PET fiber is high, which is not conducive to processing

Method used

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  • Polyester fibres and preparation method thereof
  • Polyester fibres and preparation method thereof
  • Polyester fibres and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of preparation method of polyester fiber, specifically comprises the following steps:

[0040] (1) Preparation of glycol terephthalate:

[0041] Put terephthalic acid and 2-pentyl-1,3 propanediol with a molar ratio of 1:1.3 into a slurry and add it to the reactor at a concentration of 50 wt%, and the addition amount is 0.3% of the weight of terephthalic acid. Under the catalysis of sulfuric acid, esterification reaction is carried out. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurized pressure is normal pressure and the temperature is 180°C. Time is the end point of the esterification reaction to obtain diol terephthalate;

[0042] (2) Preparation of ethylene terephthalate:

[0043] Put terephthalic acid and ethylene glycol into a slurry with a molar ratio of 1:1.2 and put them into the reactor to carry out esterification reaction. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurized pressure is...

Embodiment 2

[0052] The preparation method of the polyester fiber of embodiment 2, wherein the preparation process of modified polyester is with embodiment 1, wherein main technical parameter is referring to table 1; After step (3) adds glycol terephthalate, stir Mixed for 16 minutes, under the action of 0.011% catalyst antimony trioxide and 0.02% stabilizer triphenyl phosphate based on the total weight of terephthalic acid, under negative pressure Start the polycondensation reaction in the low vacuum stage under the condition of low vacuum, the pressure in this stage is pumped steadily from normal pressure to absolute pressure 490Pa, the temperature is controlled at 262 ° C, and the reaction time is 31 minutes; then continue to vacuum, carry out the polycondensation reaction in the high vacuum stage, so that The reaction pressure was reduced to an absolute pressure of 90 Pa, the reaction temperature was controlled at 276° C., and the reaction time was 51 minutes to prepare a modified polye...

Embodiment 3

[0056] The preparation method of the polyester fiber of embodiment 3, wherein the preparation process of modified polyester is with embodiment 1, and wherein main technical parameter is referring to table 1; After step (3) adds glycol terephthalate, stir Mixed for 16 minutes, under the action of 0.03% catalyst antimony trioxide of the total weight of terephthalic acid and 0.02% of the stabilizer triphenyl phosphate of the total weight of terephthalic acid, under negative pressure Start the polycondensation reaction in the low vacuum stage under the condition of low vacuum, the pressure in this stage is pumped steadily from normal pressure to absolute pressure 498Pa, the temperature is controlled at 263 ° C, and the reaction time is 32 minutes; then continue to vacuum, carry out the polycondensation reaction in the high vacuum stage, so that The reaction pressure was reduced to an absolute pressure of 90 Pa, the reaction temperature was controlled at 277° C., and the reaction ti...

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Abstract

The invention relates to polyester fibres and a preparation method thereof. The raw material of the polyester fibres is modified polyester which consists of a terephthalic acid chain segment, an ethylene glycol chain segment and a branched chain-containing dihydric alcohol chain segment. The preparation method of the polyester fibres comprises the following steps: performing esterification reaction on terephthalic acid and branched chain-containing dihydric alcohol under the catalysis of concentrated sulphuric acid to obtain terephthalic acid dihydric alcohol ester; then, preparing the terephthalic acid and the ethylene glycol into slurry, and performing the esterification reaction on the slurry to obtain the terephthalic acid ethylene glycol ester; finally, stirring and mixing the terephthalic acid dihydric alcohol ester and the terephthalic acid ethylene glycol ester, and performing condensation polymerization in a low vacuum stage and a high vacuum stage under the action of a catalyst and a stabilizing agent to obtain modified polyester; metering, extruding, cooling, oiling, stretching, heat-setting and winding the polyester to prepare the polyester fibres. The increasing amplitude of the spatial gaps of the polyester fibres is much higher than that of branched chain-free polyester fibres at the same temperature, which is beneficial to the degree of micro particles, such as a dye, that enter the polyester; the dyeing rate is improved.

Description

technical field [0001] The invention belongs to the technical field of polyester fibers, and relates to a polyester fiber and a preparation method thereof. Background technique [0002] Since its inception, polyethylene terephthalate (PET fiber or polyester fiber) fiber has high breaking strength and elastic modulus, moderate resilience, excellent heat setting, good heat resistance and light resistance, acid resistance, alkali resistance and corrosion resistance. It has a series of excellent performances such as anti-wrinkle and anti-wrinkle, good stiffness, etc. It is widely used in clothing, home textiles and other fields. [0003] However, due to the high crystallinity and compact structure of PET, and there is no functional group combined with the dye on the molecular chain, it is difficult for the dye molecule to enter the fiber and dyeing is difficult. Can't satisfy people to bright-coloured beautiful, the fabric demand of unique style. [0004] The reason for the di...

Claims

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Application Information

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IPC IPC(8): D01F6/84C08G63/183C08G63/78D01D4/02D01D5/08
CPCC08G63/183C08G63/78D01D4/02D01D5/08D01F6/84
Inventor 范红卫王山水王丽丽刘志立汤方明尹立新
Owner JIANGSU HENGLI CHEM FIBER
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