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A kind of easy coloring polyurethane elastic fiber and preparation method thereof

A polyurethane elasticity and fiber technology, which is applied in the field of spandex manufacturing, can solve the problems of very limited improvement in the dyeing performance of spandex, easy migration, poor dyeing fastness, etc., and achieve the effects of improving dyeing performance, simple preparation method and convenient operation.

Active Publication Date: 2018-10-19
LIANYUNGANG DUZHONG NEW AOSHEN SPANDEX
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dyeing aid has very limited improvement in the dyeing performance of spandex, and has problems such as poor color fastness, poor compatibility with polyurethane polymers, and easy migration.
Chinese patent CN104141176A discloses a kind of dyeing aid with polyurethane structure, and this dyeing aid is first 4,4-diphenylmethane diisocyanate (4,4-MDI) and 2,4-diphenylmethane diisocyanate (2,4-MDI) is prepared by mixing in the solvent dimethylacetamide or dimethylacetamide, adding N-methyldiethanolamine and N,N-dimethylethanolamine mixture under certain conditions and stirring. It has Good compatibility, high dyeing aid active ingredients per unit mass, no migration, but the improvement of spandex dyeing performance is very limited, and there is poor color fastness; in addition, spandex structure can also be modified, in The main chain of the spandex polymer increases the easy-dyeing structure. Chinese patent CN101096779A discloses a preparation method of a polyether-type easy-dyeing spandex, directly using a binary primary ammonia containing a tertiary amine structure as a co-extending agent. This method Although the produced spandex has reached a relatively ideal dyeing percentage and color fastness, because the molecular structure of spandex has been changed, the physical properties of spandex cannot meet the requirements of most varieties, so it cannot be widely promoted

Method used

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  • A kind of easy coloring polyurethane elastic fiber and preparation method thereof
  • A kind of easy coloring polyurethane elastic fiber and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] A kind of preparation method of easy coloring polyurethane elastic fiber, comprises the following steps:

[0030] (1) Prepolymerization reaction: Add 24Kg N,N-dimethylacetamide to the reactor, add 40Kg PTMEG, stir until completely dissolved, cool the PTMEG solution to 15°C under the action of refrigerant, and then add 9.5 Kg 4,4-MDI, react at 20°C for 100 minutes, then add 72Kg N,N-dimethylacetamide, stir evenly to make a prepolymer solution;

[0031] (2), chain extension and termination: dissolve 1.37Kg ethylenediamine, 0.05Kg ethanolamine and 0.324Kg 4-amino-2,2,6,6-tetramethylpiperidine in 24KgN,N-dimethylacetamide In the mixed amine solution, the mixed amine solution was slowly added to the prepolymer solution that had been cooled to 9°C for chain extension reaction, stirring while adding, and the addition of the mixed amine solution was stopped when the viscosity of the reaction system reached 3800 poise (20°C). Amine, continue to stir until the viscosity is stabl...

Embodiment 2

[0036] A kind of preparation method of easy coloring polyurethane elastic fiber, comprises the following steps:

[0037] (1) Prepolymerization reaction: Add 30Kg N,N-dimethylformamide to the reactor, add 60Kg PTMEG, stir until completely dissolved, cool the PTMEG solution to 16°C under the action of refrigerant, and then add 17.36 KgMDI-50 (a mixture of 4,4-MDI and 2,4-MDI), react at 35°C for 120 minutes, then add 80Kg N,N-dimethylacetamide to make a prepolymer solution;

[0038](2), chain extension and termination: dissolve 2.33Kg pentamethylenediamine, 0.67Kg diethylamine and 0.396Kg 4-hydroxy-2,2,6,6-tetramethylpiperidine in 30KgN,N-dimethyl In acetamide, a mixed amine solution was prepared, which was slowly added to the prepolymer solution cooled to 8°C for chain extension reaction. When the viscosity of the reaction system reached 3900 poise (20°C), the addition of the mixed amine solution was stopped and continued. Stir until the viscosity is stable, add 0.81Kg mixed am...

Embodiment 3

[0043] A kind of preparation method of easy coloring polyurethane elastic fiber, comprises the following steps:

[0044] (1) Prepolymerization reaction: Add 27Kg N,N-dimethylacetamide to the reactor, add 50Kg PTMEG, stir until completely dissolved, cool the PTMEG solution to 20°C under the action of refrigerant, and then add 11.8 Kg of 4,4-MDI, react at 45°C for 150 minutes, then add 78Kg of N,N-dimethylacetamide to make a prepolymer solution;

[0045] (2), chain extension and termination: dissolve 1.69Kg propylenediamine, 0.09Kg cyclohexylamine and 0.333Kg 4-amino-2,2,6,6-tetramethylpiperidine in 28.07KgN,N-dimethyl In acetamide, a mixed amine solution was prepared, which was slowly added to the prepolymer solution cooled to 10°C for chain extension reaction. When the viscosity of the reaction system reached 3900 poise (20°C), the addition of the mixed amine was stopped. Continue to stir until the viscosity is stable, add 0.81Kg mixed amine solution to obtain a stable stock ...

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Abstract

The invention discloses an easy-coloring polyurethane elastic fiber and a production method thereof. The easy-coloring polyurethane elastic fiber is produced from, by weight, 40-60 parts of polytetramethylene ether glycol, 9.5-20.8 parts of a diisocyanate compound, 120-140 parts of an organic solvent, 1.37-2.33 parts of a chain extender, 0.05-0.09 parts of a termination agent, 0.324-0.396 parts of a chain extender aid, 1.02-1.78 parts of titanium dioxide, 1.02-2.23 parts of magnesium stearate, and 0.34-1.11 parts of an anti-yellowing agent. The easy-coloring polyurethane elastic fiber produced in the invention greatly improves the dyeing performance of spandex fibers, the dyeing rate of an acidic dye or a weakly acidic dye on the elastic fibers is 85-93%, and the color fastness reaches 4-5 grades.

Description

technical field [0001] The invention relates to the technical field of spandex production, in particular to an easy-to-color polyurethane elastic fiber and a preparation method thereof. Background technique [0002] Spandex is one of the important varieties of synthetic fibers. It has the advantages of large elongation and high elastic recovery rate. Dry-spun spandex has incomparable elasticity to other fibers. A small amount of addition can significantly modify the elasticity of the fabric, so it is compared to textiles. "MSG". Although spandex has many excellent properties, in terms of dyeing performance, the dyeing rate and color fastness of spandex are not ideal, and there will be color difference after dyeing and finishing with other fibers. Especially for blended fabrics with dark tones, in order to improve the dyeing effect of spandex, extreme dyeing conditions are often used, which may cause abnormal phenomena such as fusing of spandex filaments, which will affect t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/32D01F6/94D01F1/10
CPCC08G18/3246C08G18/3293C08G18/4854C08G18/6681C08G18/6685C08G18/7671D01F1/10D01F6/94
Inventor 孙振波张斌曾登杨森孙迎春王建伟王宝总
Owner LIANYUNGANG DUZHONG NEW AOSHEN SPANDEX
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