A kind of preparation method with high modulus high elastic polyurethane fiber

A polyurethane fiber, high elasticity technology, applied in the direction of fiber chemical characteristics, rayon manufacturing, single-component synthetic polymer rayon, etc., can solve the problems of elastic recovery loss, elastic recovery rate deviation, low modulus, etc., to achieve elasticity The effect of high retention rate, good rebound and high modulus

Active Publication Date: 2021-04-13
ZHEJIANG HUAFENG SPANDEX
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The purpose of the invention is to solve the performance problems of the existing ordinary spandex products such as low modulus, deviation of elastic recovery rate and serious loss of elastic recovery after shaping or dyeing.

Method used

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  • A kind of preparation method with high modulus high elastic polyurethane fiber
  • A kind of preparation method with high modulus high elastic polyurethane fiber

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preparation example Construction

[0024] (1). Preparation of acrylonitrile polymer solution. First place the acrylonitrile polymer in a 60-100 degree oven for dehydration and drying for 12-24 hours. Then put the acrylonitrile polymer into a mixing tank equipped with a polar organic solvent, stir and dissolve at a constant temperature of 40-80 degrees for 5-24 hours. Then, the solution was filtered using a filter to obtain an acrylonitrile-based polymer solution.

[0025] (2). Preparation of mixed spinning dope. Mix the polyurethane solution with the acrylonitrile polymer solution, add lubricant, antioxidant, UV-resistant auxiliary agent, dyeing auxiliary agent, etc. for aging, and stir at a constant temperature of 40-60 degrees for 24-48 hours to obtain the mixed spinning Silk stock solution.

[0026] (3). Dry spinning process of mixed dope. The mixed spinning stock solution is transported to the gear pump, and then through the fine holes of the spinneret to form a thin stream of the stock solution; the th...

Embodiment 1

[0034] Select 1.2Kg of polyacrylonitrile powder with a molecular weight of about 80,000 and place it in an oven at 80 degrees to dry for 24 hours. Then polyacrylonitrile was put into 6.0Kg dimethylacetamide, the temperature was raised to 60°C, and the mixture was stirred and mixed at high speed for 10 hours. Filter the solution with a 2000-3000 mesh filter to obtain a polyacrylonitrile solution with a viscosity of 3000 poise. Select 31.0 kg of a polyurethane solution with a mass fraction of 35% and a viscosity of 4000 poise, mix it with the polyacrylonitrile solution, add lubricants, antioxidants, UV-resistant auxiliaries, and dyeing auxiliaries at the same time, and stir at a constant temperature of 50 degrees for 24 hours , to obtain the mixed spinning dope. Then the mixed spinning stock solution is transported to the gear pump, and the fine stream of the stock solution is formed through the fine holes of the spinneret; the fine stream of the stock solution evaporates the s...

Embodiment 2

[0036] The method adopted in embodiment 2 is the same as that in embodiment 1, except that the consumption of polyacrylonitrile is changed to 2.7 kg, and the spandex thus obtained is designated as sample 2.

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Abstract

The invention is a preparation method of polyurethane fiber with high modulus and high elasticity. In this method, firstly, acrylonitrile polymer is dissolved in an organic solvent to form a uniform and stable solution; then it is mixed and matured with a polyurethane solution to obtain a spinning stock solution; the spinning stock solution is evaporated in a high-temperature tunnel to remove the organic solvent to form a primary fiber , and then through false twisting, drafting, oiling, winding, and finally get spandex finished product. The spandex prepared by the present invention has the characteristics of high modulus, good resilience, and high elasticity retention rate; the spandex has smooth unwinding and low end-breakage rate during the use of high-speed empty bag and circular knitting, and can effectively improve the yarn quality. And the production efficiency of fabrics; the woven fabric samples are flat and uniform, with excellent elasticity, and can still maintain the original performance after processing such as setting and dyeing.

Description

technical field [0001] The invention belongs to a method for preparing polyurethane elastic fibers, in particular to a method for preparing polyurethane fibers with high modulus and high elasticity. Background technique [0002] Polyurethane fiber (spandex for short) is a kind of synthetic fiber with good elasticity, which is widely used in underwear, sportswear, stockings, tights, diapers and other fields. However, in recent years, with the continuous expansion of spandex application fields and changes in weaving, dyeing and finishing, conventional spandex products have gradually been unable to meet the diverse post-processing requirements. For example, in the process of using high-speed empty bags or circular knitting, the insufficient modulus of spandex often leads to broken filaments during the unwinding or weaving process, which affects the smooth production of yarns and fabrics; for example, in the field of diapers, spandex Insufficient elasticity will cause the botto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/94D01F1/10
CPCD01F1/10D01F6/94
Inventor 梁红军许图远王靖陈厚翔杨晓印邵晓林
Owner ZHEJIANG HUAFENG SPANDEX
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