Differential shrinkage composite filament and preparing method thereof

A composite yarn and different shrinkage technology, which is applied in the field of polyester fiber, can solve problems such as poor mechanical properties and uneven dyeing of polyester fiber, and achieve the effects of improving processing performance, improving dyeing performance, and reducing melt viscosity

Active Publication Date: 2017-02-08
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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  • Differential shrinkage composite filament and preparing method thereof
  • Differential shrinkage composite filament and preparing method thereof
  • Differential shrinkage composite filament and preparing method thereof

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 differential shrinkage composite filament and a preparing method thereof. According to the invention, modified polyester employs a porous spinneret for spinning to prepare the differential shrinkage composite filament; an arrangement mode of the spinneret holes on the porous spinneret is in an elliptical shape, the aperture center of the spinneret holes is positioned on concentric ellipses, the concentric ellipses are a series of ellipses, the long shafts of all ellipses are collinear, and the short shafts are collinear. The differential shrinkage composite filament is subjected to plying and doubling by modified polyester POY filament and FDY filament, then is composited through network, and finally reeled. A preparation method of the modified polyester comprises the following steps: terephthalic acid and glycol are subjected to a reaction to prepare ethylene glycol terephthalate, terephthalic acid and branched chain-containing dihydric alcohol are subjected to a reaction to obtain terephthalic acid glycol ester, and continuous reacting is carried out on the material to obtain the product. The filament has excellent fiber performance, the linear density deviation ratio is less than or equal to 2.0%, a breaking tenacity CV value is less than or equal to 4.0%, a breaking elongation CV value is less than or equal to 8.0%, and a crimp contraction variation coefficient CV value is less than or equal to 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 Applications(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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