Preparation method of polyurethane elastomeric fiber possessing excellent heat setting performance

A polyurethane elastic and heat-setting technology is applied in the field of preparation of polyurethane elastic fibers, which can solve the problems of complex process and insufficient raw material sources, and achieve the effects of simple process, excellent heat-setting performance and excellent heat-setting property.

Active Publication Date: 2014-04-16
YANTAI TAYHO ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, patents US 0193550 and US 6472494 introduce the use of copolyether diols or mixed diisocyanates to prepare polyurethane fibers with high setting efficiency, but there are insufficient sources of raw materials in the above methods
There is also patent CN101484620 which introduces to improve the heat setting efficiency of spandex by adding polyurethane compound with low softening temperature, but the compound added in this method needs new production equipment, and the process is relatively complicated

Method used

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  • Preparation method of polyurethane elastomeric fiber possessing excellent heat setting performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Polytetramethylether glycol (PTMG) with a number average molecular weight of 2000 and 4,4'-diphenylmethylene diisocyanate (MDI) equivalent to 1.8 times its equivalent, under dry nitrogen protection and mechanical stirring, React at 80°C for 3 hours to obtain prepolymer A with -NCO end cap. After cooling down to room temperature, 2.0 wt% 1,4-butanediol (BDO) in N,N-dimethylacetamide solution was added and reacted at 80° C. for 3 hours to obtain NCO-terminated prepolymer B. Wherein, the molar ratio of -OH in the alcohol chain extender to -NCO in the prepolymer A is 0.3:1. After the prepolymer B was lowered to room temperature, N, N-dimethylacetamide was added to dissolve to form a prepolymer B solution.

[0032] The temperature of the above prepolymer B solution was lowered to 10° C., and a DMAC solution of 1,2 propylenediamine and diethylamine mixed amine was added for chain extension to obtain a polyurethane solution. Wherein, the molar ratio of 1,2-propylenediamine:d...

Embodiment 2

[0034] The molar ratio of OH in the alcohol chain extender in Example 1 to NCO in the prepolymer A was adjusted to 0.2:1. The polyurethane solution is prepared by the method of Example 1, and the polyurethane fiber of 22dtex / 2f is dry-spun.

Embodiment 3

[0036] In Example 1, the molar ratio of OH in the alcohol chain extender to NCO in the prepolymer A was adjusted to 0.1:1. The polyurethane solution is prepared by the method of Example 1, and the polyurethane fiber of 22dtex / 2f is dry-spun.

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Abstract

The invention relates to a preparation method of a polyurethane elastomeric fiber possessing excellent heat setting performance, the polyurethane elastomeric fiber takes mixed alcohol and mixed amine as chain extenders, two steps are provided for chain extension to obtain a polyurethane solution. The polymer solution uses a dry method for spinning to prepare the polyurethane fiber. The softening temperature of the polyurethane elastomeric fiber is 130-180 DEG C. The finished product enables heat fixing at low temperature, and possesses excellent heat fixing performance.

Description

technical field [0001] The invention relates to a preparation method of polyurethane elastic fiber, in particular to a preparation method of polyurethane elastic fiber with low setting temperature and high setting efficiency. Background technique [0002] Polyurethane elastic fiber is a kind of textile fiber with high elasticity, which is widely used in knitted and woven elastic fabrics. After spandex and nylon, cotton and other fibers are made into fabrics, they need to be heat-set to improve the stability of the fabric. High heat-setting temperatures will cause heat-sensitive fibers (nylon, silk, wool, polytrimethylene terephthalamide) to degrade, and at the same time It will also cause certain damage to spandex, which will affect the mechanical properties and resilience of the fabric. Therefore, there is a need to develop polyurethane fibers that can be heat set at low temperatures. [0003] Various methods have been adopted to reduce the heat setting temperature of pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/94C08G18/76C08G18/48C08G18/30C08G18/10
Inventor 韩虎陈永军荣强
Owner YANTAI TAYHO ADVANCED MATERIALS CO LTD
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