Preparation method of flexible polyhydroxyl polyester fibers

A polyhydroxyl flexible polyester fiber technology, applied in the field of polyester, can solve problems such as the influence of downstream spinning, fierce competition in homogenization, and unreasonable product structure, and achieve increased moisture conductivity, less cost increase, and The effect of improving softness

Active Publication Date: 2014-05-07
JIANGSU DELI CHEM FIBER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although my country's polyester production capacity and output rank first in the world, my country's polyester fiber industry still faces some outstanding problems that need to be solved urgently: unreasonable product structure, fierce homogenization competition, and low profit margins in the industry
However, due to the large relative molecular weight of the polyethylene glycol added in the esterification stage, the activity of participating in the transesterification reaction is low, and there are still some unreacted polyethylene glycol after the reaction, which not only causes waste of raw materials, but also free polyethylene glycol. Vacuuming of alcohol macromolecules is prone to pipe blockage, and uneven distribution in polyester will have a serious impact on subsequent spinning and forming

Method used

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  • Preparation method of flexible polyhydroxyl polyester fibers
  • Preparation method of flexible polyhydroxyl polyester fibers

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Embodiment 1

[0061] A method for preparing polyhydroxy flexible polyester fibers, comprising successively a first esterification reaction, a second esterification reaction, polycondensation reaction and melt spinning molding, the specific steps are:

[0062] (1) The first esterification reaction:

[0063] Ethylene glycol, sorbitol and polyethylene glycol are mixed according to a molar ratio of 90:0.5:9.5;

[0064] Add terephthalic acid according to the 1.02:1 molar ratio of the carboxyl functional group of the dibasic acid to the hydroxyl functional group of the mixed polyol and polyethylene glycol;

[0065] The relative number average molecular weight of described polyethylene glycol is 400g / mol;

[0066] Put the mixed polyol, polyethylene glycol and the dibasic acid into the esterification reactor to carry out the first esterification reaction. The pressure of the first esterification reaction is 0.01MPa, and the reaction temperature is 230°C. The time is 4h; when the first esterificat...

Embodiment 2

[0079] A method for preparing polyhydroxy flexible polyester fibers, comprising successively a first esterification reaction, a second esterification reaction, polycondensation reaction and melt spinning molding, the specific steps are:

[0080] (1) The first esterification reaction:

[0081] Propylene glycol, sorbitol and polyethylene glycol are mixed according to a molar ratio of 90:0.5:9.5;

[0082] Add terephthalic acid according to the molar ratio of dibasic acid carboxyl functional group to the hydroxyl functional group of the mixed polyol at 1.02:1;

[0083] The relative number average molecular weight of described polyethylene glycol is 400g / mol;

[0084] Put the mixed polyol and the dibasic acid into the esterification reactor to carry out the first esterification reaction, the pressure of the first esterification reaction is 0.01MPa, the reaction temperature is 230°C, and the reaction time is 4h; When the water yield of the first esterification reaction reaches 90%...

Embodiment 3

[0096] A method for preparing polyhydroxy flexible polyester fibers, comprising successively a first esterification reaction, a second esterification reaction, polycondensation reaction and melt spinning molding, the specific steps are:

[0097] (1) The first esterification reaction:

[0098] Butylene glycol, sorbitol and polyethylene glycol are mixed according to the molar ratio of 90:0.5:9.5;

[0099] Add terephthalic acid and 5-sodium sulfonate-diethanol isophthalate in a molar ratio of 1.10:1 between the dibasic acid carboxyl functional group and the hydroxyl functional group of the mixed polyol;

[0100] Described terephthalic acid is mixed with 5-sodium sulfonate-diethanol isophthalate according to a molar ratio of 90:10;

[0101] The relative number average molecular weight of described polyethylene glycol is 400g / mol;

[0102] Put the mixed polyol and the dibasic acid into the esterification reactor to carry out the first esterification reaction, the pressure of the ...

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Abstract

The invention relates to a preparation method of flexible polyhydroxyl polyester fibers. The preparation method comprises the steps of mixing dihydric alcohol, polyhydroxyl and polyethylene glycol macromolecules according to certain molar ratio, esterfying in different stages, wherein slightly excessive acid is used in a first esterfying stage to ensure that parts of polyhydric alcohol, which has low ability to be involved esterification reaction, can be fully reacted and grafted into a polyester molecular chain; supplementing dihydric alcohol to regulate terminal carboxyl group of copolyester in a second esterfying stage, and then carrying out condensation polymerization to prepare flexible polyhydroxyl polyester; and performing melt spinning to the flexible polyhydroxyl polyester to prepare the flexible polyhydroxyl polyester fiber. The flexible polyhydroxyl polyester fiber has good moisture absorption performance and softening property, and the fiber can be dyed in a mild condition and has good dyeing performance due to the polyhydroxyl active sites in fiber and ether bonds in flexible chain polyethylene glycol; the flexible polyhydroxyl polyester fiber can be widely applied to preparation of antistatic moisture-absorption and sweat-releasing fibers and used as a closed-fit fabric. The modification effect is remarkable and the method is particularly suitable for melt direct-spinning process.

Description

technical field [0001] The invention belongs to the technical field of polyester, and relates to a method for preparing polyhydroxy flexible polyester fibers, in particular to a method of introducing polyhydroxy functional groups and flexible chains from the molecular level of polyester by means of polymerization, and then melt-spinning them through special-shaped spinnerets. Method for preparing polyhydroxy flexible polyester fibers by filament forming. Background technique [0002] In 2011, my country's polyester fiber output was 27.95 million tons, accounting for 83% of my country's chemical fiber output and 70% of the world's polyester fiber output. Although my country's polyester production capacity and output ranks first in the world, my country's polyester fiber industry still faces some outstanding problems that need to be solved urgently: irrational product structure, fierce homogenization competition, and low profit margins in the industry. In this case, the devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/62D01F6/92C08G63/672C08G63/688C08G63/78D01D13/00D01D5/253
Inventor 吉鹏王华平王朝生陈向玲张玉梅黄璐李静曹东
Owner JIANGSU DELI CHEM FIBER CO LTD
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