A kind of different shrinkage composite yarn and its preparation method

A composite yarn and differential shrinkage technology, applied in the field of polyester fibers, can solve the problems of uneven dyeing and poor mechanical properties of polyester fibers, and achieve the effects of improving dyeing performance, improving processing performance and maintaining excellent performance.

Active Publication Date: 2018-09-14
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the problems of uneven dyeing and poor mechanical properties of existing polyester fibers, realize large-scale production and spinning, and provide a method for preparing composite yarns with different shrinkage

Method used

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  • A kind of different shrinkage composite yarn and its preparation method
  • A kind of different shrinkage composite yarn and its preparation method
  • A kind of different shrinkage composite yarn and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A preparation method of modified polyester, specifically comprising the following steps:

[0069] (1) Preparation of glycol terephthalate:

[0070] 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;

[0071] (2) Preparation of ethylene terephthalate:

[0072] 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 nor...

Embodiment 2

[0077] A preparation method of modified polyester, specifically comprising the following steps:

[0078] (1) Preparation of glycol terephthalate:

[0079]Put terephthalic acid and 2-hexyl-1,3 propanediol with a molar ratio of 1:1.38 into a slurry and add to the reactor, at a concentration of 55wt%, add concentrated sulfuric acid in an amount of 0.32% of the weight of terephthalic acid Under the catalysis of the catalyst, the esterification reaction is carried out. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurized pressure is 0.13 MPa and the temperature is 181 °C. For the end point of the esterification reaction, obtain diol terephthalate;

[0080] (2) Preparation of ethylene terephthalate:

[0081] Put terephthalic acid and ethylene glycol into a slurry with a molar ratio of 1:1.3 and add them into the reactor to carry out esterification reaction. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurized pressure...

Embodiment 3

[0086] A preparation method of modified polyester, specifically comprising the following steps:

[0087] (1) Preparation of glycol terephthalate:

[0088] Put terephthalic acid with a molar ratio of 1:1.33 and 2-heptyl-1,3 propanediol into a slurry and add it to the reactor. Under the catalysis of sulfuric acid, esterification reaction is carried out. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurized pressure is 0.12 MPa and the temperature is 183 ° C. When the amount of water distilled in the esterification reaction reaches 92% of the theoretical value Time is the end point of the esterification reaction to obtain diol terephthalate;

[0089] (2) Preparation of ethylene terephthalate:

[0090] Put terephthalic acid and ethylene glycol into a slurry with a molar ratio of 1:1.31 and put them into the reactor to carry out esterification reaction. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurized pressure is ...

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Abstract

The invention relates to a different shrinkage composite yarn and a preparation method thereof. The modified polyester is spun through a porous spinneret to obtain a different shrinkage composite yarn; the arrangement of the spinneret holes on the porous spinneret is elliptical, namely The hole centers of the spinneret holes are located on concentric ellipses, and the concentric ellipses are a series of ellipses. The major axes of all ellipses are collinear, and the minor axes are collinear. Different shrinkage composite yarn is obtained by plying and plying modified polyester POY yarn and FDY yarn, through network compounding, and finally winding. The preparation method of modified polyester is: terephthalic acid and ethylene glycol react to prepare terephthalic acid Ethylene glycol diformate is added with diol terephthalate obtained by reacting terephthalic acid with branched diols, and the reaction is continued to obtain modified polyester. The fiber prepared by the invention has excellent properties, the linear density deviation rate of the different shrinkage composite yarn is ≤2.0%, the breaking strength CV value is ≤4.0%, the breaking elongation CV value is ≤8.0%, and the crimp shrinkage rate variation coefficient CV value is ≤8.0%.

Description

technical field [0001] The invention belongs to the field of polyester fibers and relates to a different shrinkage composite yarn 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 non-ironing, and good crispness. 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/92D01F1/10C08G63/183D01D4/02D01D5/08D01D5/253D01D5/24
CPCC08G63/183D01D4/02D01D5/08D01D5/24D01D5/253D01F1/10D01F6/92D06P3/54D02G1/18D01D5/16D01F6/84D01D4/022
Inventor 范红卫金管范陈明尹立新汤方明杨超明
Owner JIANGSU HENGLI CHEM FIBER
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