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Composite differential shrinkage yarn and preparation method thereof

A composite yarn and different shrinkage technology, which is applied in the field of polyester modification, can solve the problems of destroying the regularity of the chain segment, difficulty in coloring polyester fiber, and difficulty in dyeing PET fiber.

Active Publication Date: 2015-09-02
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 chain of PET is regular, the crystallinity is good, the molecular chain is closely arranged, and there is no polar group that interacts with the dye molecule on the molecular chain, which makes the coloring of polyester fiber more difficult.
[0004] In order to solve the problem of PET fiber dyeing difficulties, the current technology or method is mainly through the introduction of dye molecule acceptors or the method of increasing the amount of polyester amorphous regions. Although the dyeing performance of polyester can be improved, the chain segment regularity of PET is destroyed. , in order to reduce the performance of polyester fiber to obtain the improvement of dyeing performance

Method used

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  • Composite differential shrinkage yarn and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0077] A preparation method of different shrinkage composite yarns, comprising the following steps:

[0078] (1) Preparation of amino fatty acid ethylene glycol ester:

[0079] 1) Add dodecanedicarboxylic acid and methanol into the reactor at a molar ratio of 1:1.5, heat to 80°C under the catalysis of concentrated sulfuric acid, reflux for esterification, cool, separate and purify to obtain dodecanedicarboxylic acid Acid monomethyl ester; Described concentrated sulfuric acid refers to the sulfuric acid that mass concentration is 70%, and the concentrated sulfuric acid add-on is 3wt% of dodecane dicarboxylic acid;

[0080] 2) Dissolve the monomethyl dodecanedicarboxylate, lead tetraacetate and lithium bromide in benzene (molar ratio 1:1:1), wherein the monomethyl dodecanedicarboxylate concentration is 0.05mol / L , under a nitrogen atmosphere, react at 80 ° C, reflux, when no more gas is produced, add a certain amount of dilute sulfuric acid to react for 2 hours, then wash, puri...

Embodiment 2

[0108] A preparation of different shrinkage composite yarns, comprising the following steps:

[0109] (1) Preparation of amino fatty acid ethylene glycol ester:

[0110] 1) Add pentacodecanedicarboxylic acid and methanol into the reactor in a molar ratio of 1:1.5, under the catalysis of concentrated sulfuric acid, heat to 110°C, reflux for esterification, cool, separate and purify to obtain pentacodecane Dicarboxylic acid monomethyl ester; Described concentrated sulfuric acid refers to the sulfuric acid that mass concentration is 70%, and the concentrated sulfuric acid add-on is 3wt% of pentacosane dicarboxylic acid;

[0111] 2) The monomethyl pentacodecanedicarboxylate, lead tetraacetate and lithium bromide are dissolved in benzene (molar ratio 1:1:1), wherein the concentration of monomethyl pentacodecanedicarboxylate is 0.07mol / L, under nitrogen atmosphere, react at 85°C, reflux, when no more gas is generated, add a certain amount of dilute sulfuric acid to react for 3 hou...

Embodiment 3

[0139] A preparation method of different shrinkage composite yarns, comprising the following steps:

[0140] (1) Preparation of amino fatty acid ethylene glycol ester:

[0141] 1) Add pentadecanedicarboxylic acid and methanol into the reactor in a molar ratio of 1:1.5, under the catalysis of concentrated sulfuric acid, heat to 85°C, reflux for esterification, cool, separate and purify to obtain pentadecanedicarboxylic acid acid monomethyl ester; described concentrated sulfuric acid refers to the sulfuric acid that mass concentration is 70%, and the concentrated sulfuric acid add-on is 3wt% of pentadecanedicarboxylic acid;

[0142] 2) Dissolve the monomethyl pentadecanedicarboxylate, lead tetraacetate and lithium bromide in benzene (molar ratio 1:1:1), wherein the concentration of monomethyl pentadecanedicarboxylate is 0.08mol / L , under nitrogen atmosphere, react at 90°C, reflux, when no more gas is produced, add a certain amount of dilute sulfuric acid to react for 2.5 hours,...

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Abstract

The invention relates to a composite differential shrinkage yarn and a preparation method thereof. The composite differential shrinkage yarn is formed by compositing of a POY (polyester pre-oriented yarn) body and an FDY (fully drawn yarn) body, both the POY body and the FDY body are made of modified polyester by means of spinning, the modified polyester is formed by polyester and amino fatty acid gylcol ester, the amino fatty acid gylcol ester is scattered among molecular chains of the polyester, and a hydrogen-bond interaction among the amino fatty acid gylcol ester and the molecular chains of the polyester enables opposite positions of the amino fatty acid gylcol ester and the molecular chains of the polyester to be fixed; in the condition with temperature ranging from 90 DEG C to 130 DEG C, free volume spaces among molecular chains inside a fiber of the composite differential shrinkage yarn are enlarged by 20-30v / v%. The composite differential shrinkage yarn has the advantages that the free volume of polyester fibers is increased by the aid of fatty acid ester, so that diffusing degree of dye is improved, dyeing property of the polyester fibers is improved, and the composite differential shrinkage yarn is applicable to fashion fabric, decorative fabric and the like formed by means of spinning, knitting and warp knitting.

Description

technical field [0001] The invention belongs to the technical field of polyester modification, and relates to a composite yarn with different shrinkage and a preparation method thereof. Background technique [0002] Since its appearance, polyethylene terephthalate (PET) fiber has developed rapidly because of its excellent performance, and its output has become the crown of synthetic fibers in the world. Polyester fiber has a series of excellent properties such as high breaking strength and elastic modulus, moderate resilience, excellent heat setting, good heat resistance and light resistance, acid resistance, alkali resistance, corrosion resistance, etc. Therefore, polyester fibers are widely used in clothing, home textiles and other fields. [0003] PET is a symmetrical linear macromolecule, the molecular chain does not contain side chain groups, and its regularity is very good. Its main chain contains a rigid benzene ring and a flexible hydrocarbon group, and the ester gr...

Claims

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Application Information

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IPC IPC(8): D02G3/02D01D5/08D01F6/92D01F1/10C08G63/183C08G63/86
Inventor 李峰金管范尹立新张烨晏金龙王力军卓怀智丁竹君
Owner JIANGSU HENGLI CHEM FIBER
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