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Porous flax-like polyester fiber and preparation method thereof

A technology of hemp polyester and fiber, which is applied in the field of porous hemp-like polyester fiber and its preparation, can solve the problems of uneven dyeing and poor mechanical properties of polyester fiber, improve dyeing performance, improve processing performance, and increase the degree of diffusion Effect

Active Publication Date: 2017-02-15
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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 porous linen-like polyester fiber and its preparation method

Method used

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  • Porous flax-like polyester fiber and preparation method thereof
  • Porous flax-like polyester fiber and preparation method thereof
  • Porous flax-like polyester fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] A preparation method of modified polyester, specifically comprising the following steps:

[0063] (1) Preparation of glycol terephthalate:

[0064] 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;

[0065] (2) Preparation of ethylene terephthalate:

[0066] 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

[0070] A preparation method of modified polyester, specifically comprising the following steps:

[0071] (1) Preparation of glycol terephthalate:

[0072] 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;

[0073](2) Preparation of ethylene terephthalate:

[0074] 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

[0078] A preparation method of modified polyester, specifically comprising the following steps:

[0079] (1) Preparation of glycol terephthalate:

[0080] 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;

[0081] (2) Preparation of ethylene terephthalate:

[0082] 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 porous flax-like polyester fiber and a preparation method thereof. The porous flax-like polyester fiber is prepared by spinning modified polyester by using a porous spinneret plate, wherein spinneret holes in the porous spinneret plate are elliptically arrayed; i.e., the centers of the spinneret holes are located on concentric ellipses which are series ellipses, the long axes of all the ellipses are collinear, and the short axes of all the ellipses are also collinear. The porous flax-like polyester fiber is prepared from modified polyester POY yarns and modified polyester FDY yarns through process. A preparation method for the modified polyester comprises the following steps: reacting terephthalic acid with glycol to prepare ethylene terephthalate; adding dihydric alcohol terephthalate prepared through reaction of terephthalic acid with propylene glycol containing a branched chain; and continuing reaction so as to obtain the modified polyester. The fiber prepared in the invention has following excellent properties: a linear density deviation ratio of no more than 2.0%, a breaking tenacity CV value of no more than 4.0%, a breaking elongation CV value of no more than 8.0%, and a crimp contraction variation coefficient CV value of no more than 8.0%.

Description

technical field [0001] The invention belongs to the field of polyester fibers and relates to a porous hemp-like polyester fiber 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. A series of excellent properties such as anti-corrosion, widely used in clothing, home textiles and other fields. 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. The reason for the difficulty in PET dyeing is that PET is a symmetrical straight-chain macromolecule, the molecular chain does not contain side chain groups, and its regu...

Claims

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Application Information

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IPC IPC(8): D01F6/84C08G63/183C08G63/78D01D5/253
CPCC08G63/183C08G63/78D01D5/253D01F6/84
Inventor 邓丽娜马文平李文刚汤方明张元华金管范
Owner JIANGSU HENGLI CHEM FIBER
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