A kind of preparation method of room temperature self-healing polyurethane elastic fiber

A polyurethane elastic and self-repairing technology, applied in fiber treatment, fiber chemical characteristics, dry spinning method, etc., can solve problems such as polyurethane elastic fiber breakage, achieve the effect of improving sports ability, weakening the degree of microphase separation, and ensuring timeliness

Active Publication Date: 2021-04-20
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Technical problem: The purpose of this invention is to provide a method for preparing self-repairing polyurethane elastic fibers at room temperature, which solves the problem that conventional polyurethane elastic fibers are broken due to the gradual expansion of small cracks on the surface

Method used

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  • A kind of preparation method of room temperature self-healing polyurethane elastic fiber

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preparation example Construction

[0034] A kind of preparation method of room temperature self-repairing polyurethane elastic fiber of the present invention comprises the following steps:

[0035] 1. Mix 4,4'-diphenylmethane diisocyanate with 2,4'-diphenylmethane diisocyanate to form a diisocyanate mixture, and mix polytetrahydrofuran ether glycol with 2,2'-dithiodiethanol , to form a dihydric alcohol mixture;

[0036] 2. In the first reactor, add the diisocyanate mixture and the diol mixture at the same time, place it at a temperature of 70-80°C, and fully carry out the prepolymerization reaction to obtain a type A NCO-terminated prepolymer. In the process, N,N-dimethylacetamide is used as a solvent to fully dissolve the Class A NCO-terminated prepolymer to obtain a Class A NCO-terminated prepolymer N,N-dimethylacetamide solution ;

[0037] 3. In the second reactor, the N,N-dimethylacetamide solution of mixed amines of type A is used, wherein the mixed amines of type A include diamines as chain extenders an...

Embodiment 1

[0045] 1. Mix 18.91kg of 4,4'-diphenylmethane diisocyanate with 6.30kg of 2,4'-diphenylmethane diisocyanate to form a diisocyanate mixture. Mix 100.00kg of polytetrahydrofuran ether diol (molecular weight 1800) with 0.95kg2 , 2'-Dithiodiethanol is mixed to form a diol mixture;

[0046] 2. Send 25.21kg of diisocyanate mixture and 100.95kg of diol mixture to the first reactor at the same time. The reaction time is 2.2h and the reaction temperature is 70°C to obtain a type A NCO-terminated prepolymer. In a high-speed dissolver, Using 189.26 kg of N,N-dimethylacetamide as a solvent, fully dissolving the Class A NCO-terminated prepolymer to obtain a Class A NCO-terminated prepolymer N,N-dimethylacetamide solution;

[0047] 3. Mix 315.42kg of Class A NCO-terminated prepolymer N,N-dimethylacetamide solution and 62.78kg of Class A mixed amine N,N-dimethylacetamide solution (including 0.50kg of 1,2-propylenediamine, 2.30kg ethylenediamine, 0.34kg diethylamine) are mixed in the second ...

Embodiment 2

[0055] 1. Mix 21.55kg of 4,4'-diphenylmethane diisocyanate with 7.18kg of 2,4'-diphenylmethane diisocyanate to form a diisocyanate mixture. Mix 100.00kg of polytetrahydrofuran ether diol (molecular weight 1800) with 2.86kg2 , 2'-Dithiodiethanol is mixed to form a diol mixture;

[0056] 2. Send 28.73kg of diisocyanate mixture and 102.86kg of diol mixture to the first reactor at the same time. The reaction time is 2.2h and the reaction temperature is 70°C to obtain a type A NCO-terminated prepolymer. In a high-speed dissolver, Using 197.38kg of N,N-dimethylacetamide as a solvent, fully dissolve the Class A NCO-terminated prepolymer to obtain a Class A NCO-terminated prepolymer N,N-dimethylacetamide solution;

[0057] 3. Mix 328.97kg of NCO-terminated prepolymer N,N-dimethylacetamide solution of type A and 65.38kg of mixed amine N,N-dimethylacetamide solution of type A (including 0.52kg of 1,2-propylenediamine, 2.40kg ethylenediamine, 0.34kg diethylamine) are mixed in the second...

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Abstract

The invention discloses a method for preparing a self-repairing polyurethane elastic fiber at room temperature. The method comprises: 1) preparing a N,N-dimethylacetamide solution of a type of polyurethane-polyurea containing a disulfide bond , add coagulant, ripen to obtain the core layer spinning solution; 2), prepare the N,N-dimethylacetamide solution of the second type of polyurethane-polyurea, add antioxidant, ultraviolet absorber, lubricant , matting agent, dyeing auxiliaries and other auxiliary agents, ripening to obtain the cortex spinning solution; 3), the cortex and core layer spinning solution is subjected to spinning and stretching through the skin-core spinneret, and dried at high temperature in the tunnel to prepare the skin-core Structural polyurethane elastic fiber, and finally through oiling and winding molding to obtain room temperature self-repairing polyurethane elastic fiber silk cake.

Description

technical field [0001] The invention belongs to a preparation method of polyurethane elastic fibers, in particular to a preparation method of room temperature self-repairing polyurethane elastic fibers. Background technique [0002] Polyurethane elastic fiber, referred to as spandex, is a kind of synthetic fiber with high strength, good rebound and fine size, which is widely used in the clothing industry. Polyurethane elastic fiber is a block copolymer composed of hard segments containing urethane groups, urea groups, imino groups and soft segments containing polyether groups. The hard segment is formed by the chain extension of aromatic diisocyanate and small molecule diamine, among which there are strong hydrogen bonds among the carbamate group, urea group, and imino group, and the aromatic ring structure can form a compound with a glass transition temperature higher than the ambient temperature. microcrystalline region. The existence of hydrogen bonds and microcrystalli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/16D01F1/10C08G18/66C08G18/48C08G18/32C08G18/12D01D5/34D01D5/04D01D10/06
Inventor 孔懿阳杨晓印毛植森温作杨邵晓林池晓智
Owner ZHEJIANG HUAFENG SPANDEX
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