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Low-color-difference polyester differential shrinkage composite yarn and preparation method thereof

A different shrinkage and composite yarn technology, which is applied in the direction of single-component polyester rayon, dyeing method, rayon manufacturing, etc., can solve the problems of troublesome dyeing and post-processing, not easy to wash off, hindering liquid flow circulation, etc. Achieve the effects of eliminating aurora defects, excellent dyeing performance, and excellent shading performance

Active Publication Date: 2016-04-20
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 differential shrinkage composite yarn and preparation method thereof
  • Low-color-difference polyester differential shrinkage composite yarn and preparation method thereof
  • Low-color-difference polyester differential shrinkage composite yarn and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] A method for preparing low-chromatic-difference polyester different-shrinkage composite yarn, the main process comprising:

[0072] (1) Preparation of catalyst magnesium ethylene glycol:

[0073] 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;

[0074] (2) Preparation of polyester, including esterification reaction and polycondensation reaction:

[0075] Esterification reaction:

[0076] 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 ace...

Embodiment 2

[0097] A method for preparing low-chromatic-difference polyester different-shrinkage composite yarn, the main process comprising:

[0098] (1) Preparation of catalyst magnesium ethylene glycol:

[0099] 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;

[0100] (2) Preparation of polyester, including esterification reaction and polycondensation reaction:

[0101] Esterification reaction:

[0102] Using terephthalic acid and ethylene glycol as raw materials, the molar ratio of ethylene glycol to terephthalic acid is 2.0:1, adding...

Embodiment 3

[0123] A method for preparing low-chromatic-difference polyester different-shrinkage composite yarn, the main process comprising:

[0124] (1) Preparation of catalyst magnesium ethylene glycol:

[0125] 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 7V, the cathode current density is 160mA, and electrolyze for 11 hours at 55°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;

[0126] (2) Preparation of polyester, including esterification reaction and polycondensation reaction:

[0127] Esterification reaction:

[0128] Using terephthalic acid and ethylene glycol as raw materials, the molar ratio of ethylene glycol to terephthalic acid is 1.5:1, adding anti-ether agent sodiu...

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Abstract

The invention relates to low-color-difference polyester differential shrinkage composite yarn and a preparation method thereof. The low-color-difference polyester differential shrinkage composite yarn is obtained by compounding polyester POY (Partially Oriented Yarn) and polyester FDY (Fully Drawn Yarn); the polyester POY and the polyester FDY are obtained by spinning after dissolving-washing of polyester; the low-color-difference polyester differential shrinkage composite yarn is greater than or equal to 1.9cN / dtex in breaking strength, is 30.0+ / -5.0 percent in elongation at break, is 2.50+ / -3.0 percent in crimp contraction, is 20+ / -5 pieces per meter in interlacing degree, and is less than 0.200 in color difference deltaE. Ethylene glycol magnesium in the composite yarn is relatively mild and is very small in thermal degradation coefficient, oligomers produced in a polymerization process are reduced, and oligomers produced in a dissolving-washing process are further reduced, so that the occurrence of color spots and stripes in polyester fiber dyeing and post-processing heat setting is reduced, and the fiber levelling property and rubbing fastness are ensured. The differential shrinkage composite yarn has excellent shading performance, superior dyeing performance, high bulkiness and soft handfeel; meanwhile, a large quantity of loops exist on the surfaces of fibers, so that the aurora defect of chemical fiber yarn is overcome.

Description

technical field [0001] The invention belongs to the technical field of polyester preparation, and relates to a low-chromatic-difference polyester different-shrinkage composite yarn and a preparation method thereof, in particular to a polycondensation catalyst using a mixture of ethylene glycol magnesium and ethylene glycol antimony, as well as polyester chips washed with water and Low-color-difference polyester different-shrinkage composite yarns boiled and washed with a solvent-washing agent at 120-130°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 symmetri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/92D01F1/10C08G63/183C08G63/83C08G63/86D01D5/08D06P1/16D06P3/54D02G1/18C25B3/13
CPCC08G63/183C08G63/83C08G63/866D01D5/08D01F1/10D01F6/92D02G1/18D06P1/16D06P3/54C08G63/86D01F6/62C25B3/13
Inventor 金管范邵义伟张烨王力军卓怀智丁竹君
Owner JIANGSU HENGLI CHEM FIBER
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