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High-elongation low-modulus polyurethane elastic fiber and preparation method thereof

A polyurethane elastic, low-modulus technology, applied in the direction of fiber chemical characteristics, textile/flexible product manufacturing, rayon manufacturing, etc., can solve problems such as reducing production costs, and achieve the effect of reducing production costs

Pending Publication Date: 2022-05-27
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of the present invention uses a high proportion of bulk polyester diols to replace polyether diols, which not only can greatly reduce production costs, but also helps to realize the weaving of fibers under high draft, and can overcome the disadvantages of polyester diols. Adverse effects on the spinnability, unwinding performance, and hydrolysis resistance of polyurethane elastic fibers, making it meet the needs of production, weaving, dyeing and finishing

Method used

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  • High-elongation low-modulus polyurethane elastic fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] In this example, the high elongation low modulus polyurethane elastic fiber is prepared by the following steps:

[0049] 1. Polycondensation of 50.00kg polyester diol (3-methyl-1,3-butanediol, 1,4-butanediol, adipic acid in a molar ratio of 0.27:0.28:0.45, molecular weight 1800), 50.00 kg polytetramethylene ether glycol (molecular weight 1800) is mixed with 0.80kg 5A molecular sieve to form a glycol mixture;

[0050] 2. 23.46kg of 4,4'-diphenylmethane diisocyanate and 100.80kg of diol mixture were simultaneously sent to the first reactor, the reaction time was 2.2h, and the reaction temperature was 70°C to obtain an isocyanate-terminated prepolymer, which was In the dissolving machine, 195.53 kg of N,N-dimethylacetamide was used as a solvent to fully dissolve the isocyanate-terminated prepolymer to obtain an isocyanate-terminated prepolymer N,N-dimethylacetamide solution;

[0051] 3. Mix 319.79kg isocyanate-terminated prepolymer N,N-dimethylacetamide solution and 50.40...

Embodiment 2

[0056] In this example, the high elongation low modulus polyurethane elastic fiber is prepared by the following steps:

[0057] 1. Polycondensate 40.00kg of polyester diol (3-methyl-1,3-butanediol, 1,4-butanediol, adipic acid in a molar ratio of 0.3:0.25:0.45, molecular weight 1800, molecular weight of The determination adopts gel permeation chromatography (GPC, Shimadzu LC-20AD, Japan) to measure), 60.00kg polytetramethylene ether glycol (BASF Co., Ltd. trade mark is PTHF-1800 product, molecular weight 1800) is mixed with 0.80kg5A molecular sieve, form a diol mixture;

[0058] 2. 23.46kg of 4,4'-diphenylmethane diisocyanate and 100.80kg of diol mixture were sent to the first reactor at the same time, the reaction time was 2.2h, and the reaction temperature was 70°C to obtain an isocyanate-terminated prepolymer. In the dissolving machine, 195.53 kg of N,N-dimethylacetamide was used as a solvent to fully dissolve the isocyanate-terminated prepolymer to obtain an isocyanate-ter...

Embodiment 3

[0064] In this example, the high elongation low modulus polyurethane elastic fiber is prepared by the following steps:

[0065] 1. Polycondensate 60.00kg of polyester diol (2,5-dimethyl-2,5-hexanediol, 1,4-butanediol, and adipic acid in a molar ratio of 0.27:0.27:0.45, molecular weight 1800 ), 40.00kg polytetramethylene ether glycol (molecular weight 1800) are mixed with 0.50kg ZSM-5 molecular sieve to form a glycol mixture;

[0066] 2. 23.46kg of 4,4'-diphenylmethane diisocyanate and 100.80kg of diol mixture were simultaneously sent to the first reactor, the reaction time was 2.2h, and the reaction temperature was 70°C to obtain an isocyanate-terminated prepolymer, which was In the dissolving machine, 195.53 kg of N,N-dimethylacetamide was used as a solvent to fully dissolve the isocyanate-terminated prepolymer to obtain an isocyanate-terminated prepolymer N,N-dimethylacetamide solution;

[0067] 3. Mix 319.79kg isocyanate-terminated prepolymer N,N-dimethylacetamide solution...

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Abstract

The invention provides a high-elongation low-modulus polyurethane elastic fiber and a preparation method thereof, and the preparation method comprises the following steps: mixing polytetramethylene ether glycol, polyester diol and a molecular sieve to form a diol mixture; the preparation method comprises the following steps: adding a mixture of 4, 4 '-diphenylmethane diisocyanate and dihydric alcohol into a first reactor, reacting at the temperature of 70-80 DEG C to obtain an isocyanate-terminated prepolymer, and fully dissolving the isocyanate-terminated prepolymer by adopting N, N-dimethylacetamide as a solvent to obtain an isocyanate-terminated prepolymer N, N-dimethylacetamide solution; in a second reactor, carrying out chain extension on the isocyanate-terminated prepolymer N, N-dimethylacetamide solution by adopting a mixed amine N, N-dimethylacetamide solution, so as to obtain a polyurethane-polyurea solution; and adding an auxiliary agent into the polyurethane-polyurea solution, and carrying out spinning stretching on the spinning solution through a dry spinning system to obtain the high-elongation low-modulus polyurethane elastic fiber.

Description

technical field [0001] The invention belongs to a preparation method of a dry-process polyurethane elastic fiber, in particular to a high-stretch low-modulus polyurethane elastic fiber and a preparation method thereof. Background technique [0002] In recent years, my country's polyurethane elastic fiber industry has entered a period of rapid development. With the production capacity expansion of advanced production capacity eliminating backward production capacity and the transformation of high-quality enterprises leading the competition, the output of polyurethane elastic fiber has increased significantly, and the industry concentration has continued to increase. However, the sharp increase in production capacity has brought about periodic and structural overcapacity, resulting in a sharp drop in the price of polyurethane elastic fibers, and the demand from downstream customers has become more and more demanding. In particular, in order to reduce costs, some customers put ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/94D01F1/10C08G18/76C08G18/66C08G18/48C08G18/42C08G18/32
CPCD01F6/94D01F1/10C08G18/7671C08G18/4854C08G18/4238C08G18/4018C08G18/3206Y02P70/62
Inventor 杨晓印温作杨邵晓林陈厚翔蒋曙张经瀚
Owner ZHEJIANG HUAFENG SPANDEX
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