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Low-temperature-resistant spandex fiber and preparation method thereof

A technology of spandex fiber and low temperature resistance, which is applied in the field of polyurethane fiber, can solve the problems such as the inability to directly apply spandex fiber, and achieve the effects of high recovery rate, excellent low temperature resistance and excellent mechanical properties

Pending Publication Date: 2022-04-08
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, there is no relevant public information on the method of improving the low temperature resistance of spandex fiber, and the above patented technology cannot be directly applied to spandex fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0037] The invention provides a method for preparing low temperature resistant spandex fibers as described above, comprising the following steps:

[0038] 1) polyether diol and diisocyanate are mixed and reacted to obtain isocyanate group-terminated polyurethane prepolymer;

[0039] 2) using an organic solvent to dissolve the polyurethane prepolymer to obtain a prepolymer solution;

[0040] 3) adding a mixed amine solution to the prepolymer solution for chain extension reaction to obtain a polyurethane urea solution, which is fully matured to obtain a spinning stock solution;

[0041] 4) The spinning dope is dry-spun to obtain low-temperature-resistant spandex fibers.

[0042] Wherein, the organic solvent is one or a combination of N,N-dimethylformamide or N,N-dimethylacetamide;

[0043] The mass concentration of the spinning stock solution is 35% to 42%;

[0044] The mass concentration of the mixed amine solution is 3-7%;

[0045] The reaction temperature of the step 1) i...

Embodiment 1

[0066] The polyether diol that adopts is poly-2-methyltetrahydrofuran diol (molecular weight 1000), and diisocyanate is diphenylmethane diisocyanate;

[0067] The mixed amines are diethylamine and 1-methyl-2,4-cyclohexanediamine respectively;

[0068] Wherein, the spandex fiber also contains polyurethane plasticizer (molecular weight: 200), and the addition amount is 0.3%, which is calculated based on the mass of the prepared spandex fiber.

Embodiment 2

[0070] The polyether diol that adopts is poly-2-methyltetrahydrofuran diol (molecular weight 1400), and diisocyanate is diphenylmethane diisocyanate;

[0071] The mixed amines are diethylamine, 3,3'-dimethyl-4,4'-diamino-dicyclohexylmethane and 4-methyl-o-phenylenediamine, in which 3,3'-dimethyl-4 , the molar ratio of 4'-diamino-dicyclohexylmethane to 4-methyl o-phenylenediamine is 2:1;

[0072] Wherein, the spandex fiber also contains polyurethane plasticizer (molecular weight: 500), and the addition amount is 1.5%, which is calculated based on the mass of the prepared spandex fiber.

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Abstract

The invention relates to a low-temperature-resistant spandex fiber and a preparation method thereof. The low-temperature-resistant spandex fiber is prepared by the following steps: reacting polyether glycol with diisocyanate to obtain a polyurethane prepolymer, reacting the polyurethane prepolymer with mixed amine to obtain a polyurethane urea solution, and carrying out dry spinning by taking the polyurethane urea solution as a raw material, wherein the polyether glycol contains a side group structure. The preparation method comprises the following steps: mixing polyether glycol and diisocyanate to react, so as to obtain an isocyanate group-terminated polyurethane prepolymer; dissolving the polyurethane prepolymer by adopting an organic solvent to obtain a prepolymer solution; adding a mixed amine solution into the prepolymer solution to carry out chain extension reaction to obtain a polyurethane urea solution, adding a plasticizer, fully curing to obtain a spinning solution, and carrying out dry spinning on the spinning solution to obtain the low-temperature-resistant spandex fiber. The prepared spandex fiber has good low temperature resistance and excellent fatigue resistance and mechanical properties.

Description

technical field [0001] The invention relates to a low-temperature-resistant spandex fiber and a preparation method thereof, belonging to the technical field of polyurethane fibers. Background technique [0002] Spandex is the abbreviation of polyurethane elastic fiber (Polyurethane), which is a polyurethane elastic fiber containing more than 85% carbamate groups and having a linear molecular chain structure. Spandex has a special phase separation structure. The hard segment microdomains formed by the urethane-urea structure are dispersed in the soft segment microdomains formed by the polyester / ether polyol, showing high elongation at break (400% to 800% ), high elastic recovery rate (recovery rate as high as 95% after 300% elongation), and other special properties, so it is often used in elastic fabrics, and expanded applications in medical, sports and other fields. However, some ammonia-containing clothing needs to be worn in an environment below zero degrees Celsius, such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/94D01F1/10C08G18/10C08G18/66C08G18/48C08G18/76C08G18/32C08G18/38
Inventor 陈铃晋中成杨晓印凌云钟姜莱钱锦周志伟
Owner ZHEJIANG HUAFENG SPANDEX
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