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Easy-coloring polyurethane elastic fiber and production method thereof

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

Active Publication Date: 2016-08-10
LIANYUNGANG DUZHONG NEW AOSHEN SPANDEX
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 CN104141176 A 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 Isocyanate (2,4-MDI) is mixed in the solvent dimethylacetamide or dimethylacetamide, and the mixture of N-methyldiethanolamine and N,N-dimethylethanolamine is added under certain conditions and stirred for reaction. It is It has good compatibility, the active ingredients contained in the unit mass are high, and will not migrate, but the improvement of the spandex dyeing performance is very limited, and the dyeing fastness is poor; in addition, the spandex structure can also be modified. Add an easy-dyeable structure to the main chain of the spandex polymer. Chinese patent CN101096779A discloses a preparation method of a polyether-type easy-dye spandex, directly using a binary primary ammonia containing a tertiary amine structure as a co-extender. Although the spandex produced by the method has reached a relatively ideal dyeing percentage and color fastness, because the molecular structure of the spandex has been changed, the physical properties of the spandex cannot meet the requirements of most varieties, so it cannot be widely promoted.

Method used

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  • Easy-coloring polyurethane elastic fiber and production method thereof

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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 24Kg N,N-dimethylethyl In the amide, the mixed amine solution was prepared, and it was slowly added to the prepolymer solution cooled to 9°C for chain extension reaction, stirring while adding, and stopped adding when the viscosity of the reaction system reached 3800 poise (20°C) Mixed amine, continue to stir until the viscosity is stable, add 0.81Kg mixed amine solution to obtain...

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 Kg MDI-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-hydroxyl-2,2,6,6-tetramethylpiperidine in 30Kg N,N-dimethyl In acetamide, the 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 was stopped. Continue to stir until the viscosity is stable, add 0.81Kg mixed amine so...

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 28.07Kg N,N-di Prepare mixed amine solution in methyl acetamide, slowly add it to the prepolymer solution cooled to 10°C for chain extension reaction, stop adding mixed amine when the viscosity of the reaction system reaches 3900 poise (20°C) , continue to stir until the viscosity is stable, add 0.81Kg mixed amine solution to obtain a stable stock solution with a viscosity of 3600 p...

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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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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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