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Preparation method of colored spandex fibers

A spandex fiber and color technology, which is applied in dyeing, textiles and papermaking, etc., can solve the problems of decreased overall aesthetics of textile products, easy whitening of spandex fibers, and decreased performance of spandex, achieving bright color, not easy to fade, and low preparation cost Effect

Inactive Publication Date: 2017-09-29
合肥梵清电子商务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are no coloring groups in the molecular structure of spandex itself, so there are defects such as difficult dyeing, low color fastness, and easy performance degradation of spandex caused by dyeing.
In the prior art, spandex is often processed in the form of core-spun yarn, wrapped yarn, twisted yarn, etc. in the form of naked yarn. In the stretched state, spandex fiber is easy to show white, resulting in a decline in the overall aesthetics of textile products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of preparation method of colored spandex fiber that the present invention proposes, comprises the following steps:

[0021] S1. Dibasic acid and dibasic alcohol are mixed and polycondensed at 72°C to obtain a liquid oligomer, and then reacted with dibasic isocyanate at 90°C for 1.8h, while reacting at 250r / The rotating speed of min is mixed, and the prepolymer that reaction finishes, wherein the mol ratio of dibasic acid, dibasic alcohol and dibasic isocyanate is 5:7.8:2.4;

[0022] S2. Add the prepolymer obtained in step S1 into dimethylacetamide, keep the speed in step S1 constant, stir until completely dissolved, add diethylaminoethanol and neopentyl glycol while stirring, and stir After mixing for 30 minutes, add a cross-linking agent and stir until the reaction is completed to obtain a reaction liquid, wherein the molar ratio of prepolymer, dimethylacetamide, diethylaminoethanol, neopentyl glycol and cross-linking agent is 7:20:1:0.8 :1.5;

[0023] S3. Af...

Embodiment 2

[0027] A kind of preparation method of colored spandex fiber that the present invention proposes, comprises the following steps:

[0028] S1. Dibasic acid and dibasic alcohol are mixed and polycondensed at 78°C to obtain a liquid oligomer, and then reacted with dibasic isocyanate at a temperature of 100°C for 2.2 hours, while reacting at 280r / The rotating speed of min is mixed, and the prepolymer that reaction finishes, wherein the mol ratio of dibasic acid, dibasic alcohol and dibasic isocyanate is 5.8:6.9:2.8;

[0029] S2. Add the prepolymer obtained in step S1 into dimethylacetamide, keep the speed in step S1 constant, stir until completely dissolved, add diethylaminoethanol and neopentyl glycol while stirring, and stir After mixing for 40 minutes, add a cross-linking agent and stir until the reaction is completed to obtain a reaction liquid, wherein the molar ratio of prepolymer, dimethylacetamide, diethylaminoethanol, neopentyl glycol and cross-linking agent is 9:26:1.2:...

Embodiment 3

[0034] A kind of preparation method of colored spandex fiber that the present invention proposes, comprises the following steps:

[0035] S1. Dibasic acid and dibasic alcohol are mixed and polycondensed at 65°C to obtain a liquid oligomer, and then reacted with dibasic isocyanate at a temperature of 80°C for 1.5h, while reacting at 220r / The rotating speed of min is mixed, and the prepolymer of reaction completion, wherein the mol ratio of dibasic acid, dibasic alcohol and dibasic isocyanate is 4.2:6.5:2;

[0036] S2. Add the prepolymer obtained in step S1 into dimethylacetamide, keep the speed in step S1 constant, stir until completely dissolved, add diethylaminoethanol and neopentyl glycol while stirring, and stir After mixing for 20 minutes, add a cross-linking agent and stir until the reaction is completed to obtain a reaction liquid, wherein the molar ratio of prepolymer, dimethylacetamide, diethylaminoethanol, neopentyl glycol and cross-linking agent is 5:15:0.7:0.5 :1;...

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PUM

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Abstract

The invention discloses a preparation method of colored spandex fibers, which comprises the following steps of: after carrying out mixed polycondensation on dibasic acid and dihydric alcohol, performing a reaction on an obtained product and binary isocyanate to obtain prepolymer; dissolving the prepolymer into dimethylacetamide, stirring, adding diethylaminoethanol and neopentyl glycol, after stirring and mixing, adding a cross-linking agent to stir, and until the reaction is completed, obtaining reaction liquid; after grinding an additive, adding the ground additive into the reaction liquid, and after uniform mixing, preparing spandex bare filaments by dry spinning; adding the spandex bare filaments into a shaking water bath kettle filled with staining fluid to dye so as to obtain dyed spandex; after sequentially cleaning the dyed spandex by hot water and cold water, air-drying and rolling to obtain the colored spandex fibers. The preparation method disclosed by the invention is simple, low in preparation cost, high in preparation efficiency and mild in preparation condition; reduction of spandex performance cannot be caused; the obtained colored spandex is bright in color and lustre, high in color fastness and difficult to fade, can be directly used for subsequent production processing without being dyed again, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of chemical fibers, in particular to a method for preparing colored spandex fibers. Background technique [0002] Chemical fibers refer to those fibers that are made from natural or synthetic high polymers and processed by chemical methods. Spandex is the abbreviation of polyurethane fiber, which is a kind of elastic fiber, which is a kind of chemical fiber. It is highly elastic and can be stretched 6-7 times, but it can quickly return to its original state as the tension disappears. Its molecular structure is a chain-like, soft and extensible polyurethane. Hard segments link together to enhance its properties. The strength of spandex fiber is 2 to 3 times higher than that of latex silk, the linear density is also finer, and it is more resistant to chemical degradation. Spandex has good acid and alkali resistance, sweat resistance, sea water resistance, dry cleaning resistance and abrasion resistance. It ...

Claims

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Application Information

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IPC IPC(8): D06P3/26D06P1/16D06P1/52D06P1/673D01F6/94C08G18/10C08G18/66C08G18/32
CPCD06P3/26C08G18/10C08G18/6655D01F6/94D06P1/16D06P1/5292D06P1/673C08G18/3275C08G18/3206
Inventor 不公告发明人
Owner 合肥梵清电子商务有限公司