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Low-color-difference polyester DTY (Draw Textured Yarn) and preparation method thereof

A polyester and chromatic aberration technology, applied in the direction of single-component polyester rayon, rayon manufacturing, melt spinning, etc., can solve the problems of color flower, hindering liquid flow circulation, not easy to wash off, etc.

Active Publication Date: 2016-06-08
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature drops, like dyes, the solubility of oligomers in water decreases sharply with the decrease of temperature, so they will crystallize and precipitate, and the precipitated dyes and oligomers are attached to the surface of the fiber and are not easy to wash off, thus affecting dyeing and post-processing. It brings a lot of trouble. During the dyeing process, the aggregated dyes and oligomers adhere to the surface of the fiber, and dye spots, spots, and color flowers appear.
Deposits in the pipes and valves of the dyeing machine, hindering the circulation of the liquid flow, resulting in difficulty in dyeing

Method used

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  • Low-color-difference polyester DTY (Draw Textured Yarn) and preparation method thereof
  • Low-color-difference polyester DTY (Draw Textured Yarn) and preparation method thereof
  • Low-color-difference polyester DTY (Draw Textured Yarn) and preparation method thereof

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preparation example Construction

[0057] A kind of preparation method of polyester DTY yarn with low color difference of the present invention, terephthalic acid and ethylene glycol undergo esterification and polycondensation under the catalysis of the mixture of ethylene glycol magnesium and ethylene glycol antimony to obtain polyester, and then through Cut into pellets to obtain polyester chips, and then dissolve and wash the polyester chips to obtain polyester; then measure, extrude, cool, oil and wind to obtain POY filaments. Polyester DTY yarn with low color difference is made from POY yarn through wire guide tube, network, heating stretching, false twisting, heat setting and winding molding.

[0058] 1. Dye:

[0059] Disperse Brilliant Blue 2BLN, 5% (o.w.f)

[0060] 2. Dyeing process:

[0061] The fiber is dyed at 70-80°C for 10-15 minutes, the temperature rise rate is 1.0-2.0°C / min, the temperature is kept at 120-130°C for 40-60 minutes, the temperature is lowered, and the reduction cleaning is perfor...

Embodiment 1

[0074] A preparation method of low color difference polyester DTY yarn, the main process comprises:

[0075] (1) Preparation of catalyst magnesium ethylene glycol:

[0076] Add ethylene glycol into the single-chamber electrolytic cell, the supporting electrolyte is magnesium chloride, the metal magnesium block is the anode, and the cathode is graphite; connect direct current, the initial voltage is 6V, the cathode current density is 150mA, and electrolyze for 10 hours at 50°C. Take out the electrode to obtain a white suspension; filter under reduced pressure, wash the white solid with absolute ethanol, and dry to obtain magnesium ethylene glycol;

[0077] (2) Preparation of polyester, including esterification reaction and polycondensation reaction:

[0078] Esterification reaction:

[0079] Use terephthalic acid and ethylene glycol as raw materials, the molar ratio of ethylene glycol to terephthalic acid is 1.2:1, add anti-ether agent sodium acetate, the amount of sodium ace...

Embodiment 2

[0101] A preparation method of low color difference polyester DTY yarn, the main process comprises:

[0102] (1) Preparation of catalyst magnesium ethylene glycol:

[0103] Add ethylene glycol into the single-chamber electrolytic cell, the supporting electrolyte is magnesium chloride, the metal magnesium block is the anode, and the cathode is graphite; connect direct current, the initial voltage is 10V, the cathode current density is 200mA, electrolyze at 60°C for 12 hours, after the electrolysis ends Take out the electrode to obtain a white suspension; filter under reduced pressure, wash the white solid with absolute ethanol, and dry to obtain magnesium ethylene glycol;

[0104] (2) Preparation of polyester, including esterification reaction and polycondensation reaction:

[0105] Esterification reaction:

[0106] Using terephthalic acid and ethylene glycol as raw materials, the molar ratio of ethylene glycol to terephthalic acid is 2.0:1, adding anti-ether agent calcium ac...

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Abstract

The invention relates to low-color-difference polyester DTY (Draw Textured Yarn) and a preparation method thereof. The low-color-difference polyester DTY is prepared through carrying out spinning processing on polyester and has the rupture strength not lower than 1.9cN / dtex, the breaking elongation of 30.0+ / -5.0% and the color difference delta-E smaller than 0.200. According to the low-color-difference polyester DTY and the preparation method thereof, ethylene glycol magnesium is relatively mild, has a very small thermal degradation coefficient and causes less side reactions during reaction, so that the production of oligomers during processing is reduced; the mass percent of the oligomers is lower than 0.5%, and the mass percent of diethylene glycol is lower than 0.5%. The oligomers are reduced during polymerization and are further reduced during dissolving and washing, so that during the dyeing and postprocessing thermosetting of polyester fibers, the amount of the oligomers migrating to the outside of the fibers from the inside is reduced, the occurrence of color spots and streaks is reduced, and the level dyeability and rubbing fastness of the fibers are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of polyester preparation, and relates to a low-color-difference polyester DTY yarn and a preparation method thereof, in particular to a polycondensation catalyst using a mixture of ethylene glycol magnesium and ethylene glycol antimony and polyester chips washed with water and dissolved The low color difference polyester DTY yarn boiled and washed under the conditions of 120-130 DEG C and 0.2-0.3 MPa and a preparation method thereof. Background technique [0002] Polyethylene terephthalate (PET) is a polymer with excellent properties. PET is widely used for its high modulus, high strength, crispness, good shape retention, purity and hygiene, and good barrier properties. In the fields of fiber, bottle packaging, film and sheet, etc., the output is increasing year by year, and the industry status has been significantly improved. [0003] PET is a symmetrical linear macromolecule, the molecular chain does not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/92D01F1/10C08G63/86C08G63/83C08G63/183C08G63/90D01D5/08
CPCC08G63/183C08G63/83C08G63/866C08G63/90D01D5/08D01F1/10D01F6/92
Inventor 沈建根马文平张学东张元华温浩
Owner JIANGSU HENGLI CHEM FIBER
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