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A kind of low melting point polyester fiber and preparation method thereof

A low-melting polyester and fiber technology, applied in fiber processing, fiber chemical characteristics, rayon manufacturing, etc., can solve problems such as limited application, and achieve the effect of improving melting performance, fast melting speed, and low melting point temperature

Active Publication Date: 2019-05-31
扬州富威尔复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of low-melting point polyester has adverse effects, especially limiting its application in automobiles and closed environments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A kind of preparation method of low melting point polyester fiber:

[0050] a) low melting point polyester polymerization;

[0051] (1) Esterification reaction;

[0052] After preparing terephthalic acid, isophthalic acid, ethylene glycol, diethylene glycol, and benzoic acid into slurry, carry out esterification reaction, pressurized reaction under nitrogen atmosphere, pressurized pressure is normal pressure, temperature is 230 ℃, when the distilled amount of water in the esterification reaction reaches more than 90% of the theoretical value, it is the end point of the esterification reaction, and the esterification product is obtained; among them, terephthalic acid, isophthalic acid, diethylene glycol and ethylene glycol The molar ratio of alcohol is 1:0.4:0.1:1.8; the addition amount of benzoic acid is 0.01% of the molar number of phthalic acid.

[0053] (2) polycondensation reaction;

[0054] Then, under the action of catalyst and stabilizer, the polycondensation ...

Embodiment 2

[0065] A kind of preparation method of low melting point polyester fiber:

[0066] a) low melting point polyester polymerization;

[0067] (1) Esterification reaction;

[0068] After preparing terephthalic acid, isophthalic acid, ethylene glycol, diethylene glycol, and p-toluic acid into a slurry, carry out esterification reaction, and pressurize the reaction under nitrogen atmosphere, and the pressurized pressure is 0.3MPa. The temperature is 250°C, when the distilled amount of water in the esterification reaction reaches more than 90% of the theoretical value, it is the end point of the esterification reaction, and the esterification product is obtained; among them, terephthalic acid, isophthalic acid, diethylene glycol The molar ratio with ethylene glycol is 1:0.6:0.3:2.5; the amount of p-toluic acid added is 0.5% of the molar number of phthalic acid.

[0069] (2) polycondensation reaction;

[0070] Then, under the action of catalyst and stabilizer, the polycondensation ...

Embodiment 3

[0081] A kind of preparation method of low melting point polyester fiber:

[0082] a) low melting point polyester polymerization;

[0083] (1) Esterification reaction;

[0084]After preparing terephthalic acid, isophthalic acid, ethylene glycol, diethylene glycol, and p-ethylbenzoic acid into a slurry, carry out esterification reaction, and pressurize the reaction under nitrogen atmosphere, and the pressurized pressure is 0.1MPa. The temperature is 240°C. When the distilled amount of water in the esterification reaction reaches more than 90% of the theoretical value, it is the end point of the esterification reaction, and the esterification product is obtained; among them, terephthalic acid, isophthalic acid, diethylene glycol The molar ratio with ethylene glycol is 1:0.5:0.2:2; the amount of p-ethylbenzoic acid added is 0.1% of the moles of phthalic acid.

[0085] (2) polycondensation reaction;

[0086] Then, under the action of catalyst and stabilizer, the polycondensatio...

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Abstract

The invention relates to a polyester fiber with a low melting point and a method for preparing the polyester fiber. The polyester fiber with the low melting point is of a skin-core structure, skin layers are made of polyester with a low melting point, and core layers are made of PET (polyethylene terephthalate); the polyester with the low melting point comprises terephthalic acid chain segments, isophthalic acid chain segments, ethylene glycol chain segments, diethylene glycol chain segments and molecular weight regulator end-capping groups; corresponding molecular weight regulators of the molecular weight regulator end-capping groups particularly comprise benzoic acid, p-toluic acid or ethylbenzoic acid, or methyl ester or ethyl ester corresponding to the benzoic acid, the p-toluic acid or the ethylbenzoic acid, or saturated fatty acid or methyl ester or ethyl ester corresponding to the saturated fatty acid; the content of acetaldehyde in the polyester fiber with the low melting point is lower than 0.5 ppm. The method includes steps of polymerizing the polyester with the low melting point and carrying out composite spinning on skin and cores; carrying out back spinning by the aid of drafting-washing processes; carrying out oil-bath drafting by the aid of added sodium sulfite; carrying out crimping, cutting-off and drying to obtain the polyester fiber with the low melting point. The polyester fiber with the low melting point and the method have the advantages that the polyester fiber prepared by the aid of the method has the low melting point and is low in acetaldehyde content.

Description

technical field [0001] The invention belongs to the field of low-melting-point polyester fibers, and relates to a low-melting-point polyester fiber and a preparation method thereof, in particular to a low-melting-point polyester fiber with low acetaldehyde content and a preparation method thereof. Background technique [0002] At present, the non-woven fabric industry is developing rapidly, especially the polyester non-woven fabric industry needs a polymer with a melting point lower than ordinary polyester, but has good compatibility with ordinary polyester as a thermal bonding fiber. Modification of ordinary polyester to prepare low melting point polyester. [0003] Low-melting point copolyester is a polyester with a lower melting point obtained by chemically modifying ordinary polyester. Because its structure is similar to that of ordinary polyester, it retains some of the characteristics of ordinary polyester. Ordinary polyester has good compatibility. This modified cop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/34D01D5/092D01F8/14D01F1/10C08G63/672C08G63/78
CPCC08G63/672C08G63/78D01D5/092D01D5/34D01F1/10D01F8/14
Inventor 高国詹勇余小平
Owner 扬州富威尔复合材料有限公司
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