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A cationic dyeable polyurethane elastic fiber and its preparation method

A polyurethane elastic and cationic technology, applied in fiber chemical characteristics, single-component synthetic polymer rayon, textiles and papermaking, etc., can solve the problems of less research on coloring properties, achieve bright color, reduce energy consumption, and improve quality effect

Active Publication Date: 2018-11-06
华峰重庆氨纶有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, most of the current research focuses on improving the colorability of acid dyes and disperse dyes for spandex fibers, while there are fewer studies on improving the colorability of cationic dyes for spandex fibers.

Method used

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  • A cationic dyeable polyurethane elastic fiber and its preparation method
  • A cationic dyeable polyurethane elastic fiber and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Polytetrahydrofuran ether glycol PTMG (molecular weight 1810) 375.95Kg, small molecule sulfonate-based diol 0.451Kg (dimethyl isophthalate-5-sodium sulfonate and 1,4-butanediol The reactant, which is equivalent to 1200ppm small molecule sulfonate-based diol in 1Kg PTMG) and 87.95Kg of diphenylmethane-4,4'diisocyanate are placed in the reactor and reacted at 86±2°C for 120min. Obtaining isocyanate group-terminated prepolymers;

[0027] (2) Add 692.8Kg of DMAC to the prepolymer to fully dissolve the prepolymer in DMAC;

[0028] (3) Add 7.841Kg ethylenediamine, 0.509Kg propylenediamine, 1.522Kg diethylamine dissolved in 187.567Kg DMAC to the prepolymer solution to form an amine mixed solution to carry out chain extension reaction and chain termination reaction , to obtain polyurethane urea stock solution;

[0029] (4) adding matting agent, anti-yellowing agent, ultraviolet absorber, antioxidant and lubricating release agent to polyurethane urea stock solution to obta...

Embodiment 2

[0032] The preparation method is the same as in Example 1, except that every 1Kg of PTMG contains 3500ppm of small molecule sulfonate-based glycol.

Embodiment 3

[0034] The preparation method is the same as in Example 1, except that every 1Kg of PTMG contains 7500ppm of small molecule sulfonate-based glycols.

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Abstract

The invention relates to a preparation method of a cationic dyeable polyurethane elastic fiber. The preparation method includes the specific steps of 1), at a prepolymerization reaction stage, preparing an isocyanate-group-terminated prepolymer from diphenyl methane-4,4'-diisocyanate and polytetrahydrofuran glycol, wherein the polytetrahydrofuran glycol contains 1,200-125,000 ppm micromolecular sulfonate-based diol; 2), dissolving the prepolymer prepared in the step 1 by a nonprotic polar solvent so as to obtain a prepolymer solution; 3), adding a chain extender and a chain terminator into the prepolymer solution obtained in the step 2, and conducting polymerization reaction so as to obtain a polyurethaneurea solution; 4), curing a spandex spinning solution prepared in the step 3, and performing a dry spinning method so as to obtain the cationic dyeable polyurethane elastic fiber. The cationic dyeable polyurethane elastic fiber has a cationic dye dyeable function and can be dyed with cationic dyeable blended polyester at an ordinary pressure, so that a 'bare' phenomenon during spandex stretching is prevented.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a cationic dyeable polyurethane elastic fiber and a preparation method thereof. The polyurethane elastic fiber prepared by the invention has the function of being dyeable with cationic dyes, and can be blended with cationic dyeable polyester to be dyed under normal pressure, and has high dye uptake, good color fastness and bright colors. Background technique [0002] Due to the advantages of high breaking strength, high elongation at break and good elastic recovery rate, polyurethane elastic fiber has been widely used in elastic fabric materials, such as tights, fitness clothes, underwear, high elastic socks and swimwear. [0003] Usually, the fabrics blended with spandex fibers and other synthetic fibers or natural fibers have to go through the dyeing process, but due to the chemical structure of spandex fibers, that is, there are not enough func...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/94C08G18/66C08G18/48C08G18/32C08G18/12
CPCC08G18/12C08G18/3855C08G18/4854C08G18/6666D01F6/94C08G18/3206
Inventor 薛士壮钱锦晋中成刘珊珊费长书杨晓印
Owner 华峰重庆氨纶有限公司
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