A kind of three-dimensional crimped low melting point polyester fiber and its preparation method

A low-melting polyester, three-dimensional crimping technology, used in fiber processing, conjugated synthetic polymer rayon, filament/thread forming, etc., can solve the problem of slow melting speed, high melting point, and low-melting fiber development. and other problems, to achieve the effect of fast melting speed and low melting point temperature

Active Publication Date: 2018-12-11
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

[0005] The market demand for low-melting point polyester is very large. Compared with foreign countries, the development of domestic low-melting point fibers started relatively late, and the variety is relatively single. There is still a certain gap between the raw materials, technology and equipment and international leading products. At present, the domestic Most of the products are still in the development stage, and they still face many difficulties on the road to industrialization
On the one hand, the existing low-melting point polyester has a higher melting point, on the other hand, its melting speed is slow, which greatly affects the use of low-melting point polyester

Method used

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  • A kind of three-dimensional crimped low melting point polyester fiber and its preparation method
  • A kind of three-dimensional crimped low melting point polyester fiber and its preparation method
  • A kind of three-dimensional crimped low melting point polyester fiber and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A preparation method of three-dimensional crimped low-melting polyester fiber:

[0049] a) low melting point polyester polymerization;

[0050] (1) Esterification reaction;

[0051] After preparing terephthalic acid, isophthalic acid, ethylene glycol, diethylene glycol, 1,8-naphthalene dicarboxylic acid and 2-pentyl-1,12 dodecanediol into slurry, carry out esterification reaction , pressurized reaction under a nitrogen atmosphere, pressurized pressure is normal pressure, temperature is 230 ° C, when the distilled amount of water in the esterification reaction reaches more than 90% of the theoretical value, it is the end of the esterification reaction, and the esterification product is obtained ; Wherein, the molar ratio of terephthalic acid, isophthalic acid, diethylene glycol, 2-pentyl-1,12 dodecanediol, and ethylene glycol is 1:0.4:0.1:0.05:1.8; 1, The addition amount of 8-naphthalene dicarboxylic acid is 3% of the molar number of phthalic acid.

[0052] (2) polyco...

Embodiment 2

[0064] A preparation method of three-dimensional crimped low-melting polyester fiber:

[0065] a) low melting point polyester polymerization;

[0066] (1) Esterification reaction;

[0067] After preparing terephthalic acid, isophthalic acid, ethylene glycol, diethylene glycol, phthalic acid and 2-hexyl-1,12 dodecanediol into a slurry, carry out esterification reaction, in a nitrogen atmosphere Under pressurized reaction, the pressurized pressure is 0.3MPa, and 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; wherein, for The molar ratio of phthalic acid, isophthalic acid, diethylene glycol, 2-hexyl-1,12 dodecanediol, and ethylene glycol is 1:0.6:0.3:0.1:2.5; the amount of phthalic acid added It is 4.3% of the moles of phthalic acid.

[0068] (2) polycondensation reaction;

[0069]Then, und...

Embodiment 3

[0080] A preparation method of three-dimensional crimped low-melting polyester fiber:

[0081] a) low melting point polyester polymerization;

[0082] (1) Esterification reaction;

[0083] After preparing terephthalic acid, isophthalic acid, ethylene glycol, diethylene glycol, 1,2-cyclopentane dicarboxylic acid and 2-heptyl-12 dodecanediol into slurry, carry out esterification reaction , pressurized reaction under a nitrogen atmosphere, 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 of the esterification reaction, and the esterification product is obtained ; Wherein, the molar ratio of terephthalic acid, isophthalic acid, diethylene glycol, 2-heptyl-12 dodecanediol, and ethylene glycol is 1:0.5:0.2:0.07:2; 1,2- The addition amount of cyclopentane dicarboxylic acid is 4% of the mole number of phthalic acid.

[0084] (2) polycondensa...

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Abstract

The invention relates to a three-dimensional crimp low-melting-point polyester fiber and a preparation method thereof. The three-dimensional crimp low-melting-point polyester fiber is in a skin-core structure, a skin layer is made of low-melting-point polyester, and a core layer is made of PET (polyethylene terephthalate). The low-melting-point polyester is formed by a terephthalic acid chain segment, an isophthalic acid chain segment, an ethylene glycol chain segment, a diethylene glycol chain segment, a molecular weight modifier and a branched dodecanediol chain segment. The molecular weight modifier is 1,8-naphthalic acid, phthalic acid, 1,2-cyclopentanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid or corresponding dimethyl esters or diethyl esters thereof. The preparation method includes steps of low-melting-point polyester polymerization, skin-core composite spinning, crimping, oiling, cutting and drying to obtain the three-dimensional crimp low-melting-point polyester fiber. Core layer spinneret holes of a spinneret plate in the composite spinning process are crescent. The three-dimensional crimp low-melting-point polyester fiber prepared according to the method is low in melting point.

Description

technical field [0001] The invention belongs to the field of three-dimensional crimped low-melting polyester fibers, and relates to a three-dimensional crimped low-melting polyester fiber 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 copolyester not only has low melting point, good fluidity, but also moderate pri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/14C08G63/672D01D5/34
CPCC08G63/672D01D5/34D01F8/14
Inventor 余小平朱兴荣张盛
Owner 扬州富威尔复合材料有限公司
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