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Preparation method of polyurethane elastic fiber suitable for low-temperature setting

A polyurethane elasticity and fiber technology, which is applied in the preparation field of polyurethane elastic fibers, can solve the problems of inability to meet the requirements of heat-sensitive fibers, and the use of chain extenders is not disclosed, and achieves excellent heat-setting efficiency and widens the effect of application fields.

Active Publication Date: 2013-08-21
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the temperatures with better setting efficiency in these patents are all around 170°C or above, which cannot meet the requirements of some heat-sensitive fibers that require lower temperature setting, and do not disclose the use of chain extenders N-methylethylenediamine, N-ethylenediamine, etc. Ethylenediamine, N-isopropyl-1,3-propanediamine

Method used

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  • Preparation method of polyurethane elastic fiber suitable for low-temperature setting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 9.0kg of PTMG with a number average molecular weight of 1810 and 5.5kg of DMAC in a reactor equipped with a stirrer, add 2.486kg of MDI, react and polymerize for 135min, and then add 12.8kg of DMAC to adjust the prepolymer concentration.

[0040] Then add DMAC solution containing 84.8g (0.962mol) of N-ethylethylenediamine, 231g (3.850mol) of ethylenediamine and 23.4g of diethylamine for chain extension reaction, and finally add 0.7% by weight anti-yellowing Agent, 1.0% by weight of antioxidant, 0.35% by weight of ultraviolet absorber, 0.3% by weight of lubricating and detaching agent to obtain the spinning stock solution, the concentration of the stock solution is 35%, after aging, defoaming, and filtering, it is formed into spandex by dry spinning. Dry spinning is spun into 20D (Denier) polyurethane elastic fiber. Then its heat setting efficiency was examined.

[0041] Heat setting efficiency detection method: stretch the polyurethane elastic fiber by 100% (from 1...

Embodiment 2

[0044] Polyurethane elastic fibers were prepared according to the same method described in Example 1, except that 212.1 g (2.406 mol) of N-ethylethylenediamine, 144.4 g (2.406 mol) of ethylenediamine and 23.4 g of diethylenediamine were added. Ethylamine in DMAC solution for chain extension reaction.

Embodiment 3

[0046] Polyurethane elastic fibers were prepared according to the same method described in Example 1, except that 339.4 g (3.850 mol) of N-ethylethylenediamine, 57.7 g (0.962 mol) of ethylenediamine and 23.4 g of diethylenediamine were added. Ethylamine in DMAC solution for chain extension reaction.

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Abstract

The invention relates to a preparation method of polyurethane elastic fiber suitable for low-temperature setting. The preparation method uses one or more of N-methylethylenediamine, N-ethylethylenediamine, and N-isopropyl-1,3-propanediamine, the content of which is 20-80 mole% of a chain extender, wherein the chain expander further comprises one or more of ethylenediamine, 1,2-propanediamine, 1,3-propanediamine, hexamethylenediamine or 2-methylpentanediamine. The polyurethane elastic fiber prepared by the preparation method provided by the invention has excellent heat setting efficiency below the setting temperature of 170 DEG C; and compared with the prior art, when the polyurethane elastic fiber prepared by the preparation method provided by the invention is woven with heat sensitive fiber, the obtained product can be heat-set at a temperature lower than 170 DEG C, and has excellent heat-setting efficiency, so that the field of spandex application is broadened.

Description

technical field [0001] The present invention relates to a preparation method of polyurethane elastic fiber suitable for low-temperature setting, in particular, it provides a preparation method of polyurethane elastic fiber with high heat-setting efficiency at a setting temperature below 170°C, which belongs to a technology of polymer material manufacturing field. Background technique [0002] Polyurethane elastic fiber has the characteristics of high resilience, high breaking strength and high elongation at break, and is widely used in various fields. With the continuous expansion of its use, customers have higher and higher requirements for elastic fibers. [0003] Usually, polyurethane elastic fibers will be heat-set at high temperature (about 190°C) during post-processing, and high temperature will cause thermal degradation of heat-sensitive fibers, such as nylon, wool, polypropylene, rayon, cotton yarn, etc. When wool, cotton and nylon blended fabrics need to be heat-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/94D01F1/10D01D5/04C08G18/66C08G18/48C08G18/32C08G18/10
CPCY02P20/10
Inventor 李建通梁红军邵晓林冯益虎许图远吴国华
Owner ZHEJIANG HUAFENG SPANDEX