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Method for producing spandex filament by using recycled spandex filament wastes

A technology of spandex waste and spandex yarn, which is applied in the manufacture of rayon, single-component synthetic polymer rayon, textiles and papermaking, etc., can solve the problems of single product variety, low qualification rate, high energy consumption and material consumption, and achieve The effect of high qualification rate, great economic benefit and less investment

Inactive Publication Date: 2012-11-28
吴中虎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Occasionally there is a method to recycle waste spandex yarn into normal spandex yarn, but there are problems of high energy consumption and material consumption, low pass rate, and single product variety.

Method used

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  • Method for producing spandex filament by using recycled spandex filament wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1, a kind of method utilizing spandex waste silk to recycle and produce spandex yarn, its steps are as follows:

[0013] (1) Use PTMEG and MDI to prepolymerize to form a prepolymer; the prepolymer and the chain extender perform a chain extension reaction to form a polymer; at the same time, add an organic solvent to make a stock solution with a mass concentration of 15%, and keep the temperature at 50°C ;

[0014] (2) Spandex waste silk is crushed into spandex staple fibers with a length of 5 cm, and vacuum-dried at 50°C;

[0015] (3) Add spandex staple fiber to the stock solution at 50°C, and the spandex staple fiber accounts for 10% of the mass of the stock solution; then add an appropriate amount of organic solvent DMAC at 60°C while stirring, and adjust it to a mass ratio of solid content of 25 %, the spinning stock solution with a viscosity of 3000 poise, let it stand for 12 hours, filter, add additives to the filtrate, defoam, spin and recover the solv...

Embodiment 2

[0016] Embodiment 2, a kind of method that utilizes spandex waste silk recycling to produce spandex yarn, its steps are as follows:

[0017] (1) Use PTMEG and MDI to prepolymerize to form a prepolymer; the prepolymer and the chain extender perform a chain extension reaction to form a polymer; at the same time, add an organic solvent to make a stock solution with a mass concentration of 30%, and keep the temperature at 85°C ;

[0018] (2) Spandex waste silk is crushed to make spandex staple fibers with a length of 30cm, and vacuum-dried at 85°C;

[0019] (3) Add spandex staple fiber to the stock solution at 85°C, and the spandex staple fiber accounts for 90% of the mass of the stock solution; then add an appropriate amount of 80°C organic solvent DMAC while stirring, and adjust it to a mass ratio of solid content of 35 %, viscosity of 6000 poise spinning stock solution, 5 rev / min stirring for 24 hours, filtering, adding additives to the filtrate, defoaming, spinning and recycl...

Embodiment 3

[0020] Embodiment 3, a method for utilizing spandex waste silk to recycle and produce spandex yarn, the steps are as follows:

[0021] (1) Use PTMEG and MDI to pre-polymerize to form a pre-polymer; the pre-polymer and the chain extender undergo a chain extension reaction to form a high-molecular polymer; at the same time, add an organic solvent to make a stock solution with a mass concentration of 20%, and keep the temperature at 80°C ;

[0022] (2) Spandex waste silk is crushed to make spandex staple fibers with a length of 10cm, and vacuum-dried at 80°C;

[0023] (3) Add spandex staple fiber to the stock solution at 80°C, and the spandex staple fiber accounts for 30% of the mass of the stock solution; then add an appropriate amount of 80°C organic solvent DMAC while stirring, and adjust it to a mass ratio of solid content of 30 %, viscosity of 4000 poise spinning stock solution, 30 rpm stirring for 12 hours, filtering, adding additives to the filtrate, defoaming, spinning a...

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Abstract

The invention discloses a method for producing a spandex filament by using recycled spandex filament wastes. The method is characterized by comprising the following steps of: 1, generating a prepolymer by using prepolymerization of polytetramethylene ether glycol and diphenylmethane diisocyanate, generating a high molecular polymer by carrying out chain extension reaction of the prepolymer and a chain extender, and adding a solvent to prepare a stock solution of which the mass concentration is 15-30 percent and maintaining the temperature at 50-85 DEG C; 2, smashing the spandex filament wasteto prepare a spandex short fiber with a length of 5-30 cm and vacuum drying; and 3, adding the spandex short fiber into the stock solution and adding dimethylacetamide and then compounding to obtain a spinning solution, standing or stirring, filtrating, adding an auxiliary agent into the filtrate, defoaming, spinning and recycling the solvent and winding to obtain a finished product of spandex. According to the method disclosed by the invention, the operation process is simple and convenient, the investment is small, the problem of environmental pollution can be solved and larger economic benefits can also be obtained; moreover, spandexes with various sizes of 20-1680 d (degree of fitness) can be produced, the performance of the produced spandexes is same as the performance of a normal spandex and the qualification rate is higher.

Description

technical field [0001] The invention relates to a production method of spandex yarn, in particular to a method for producing spandex yarn by recycling spandex waste silk. Background technique [0002] In the prior art, the conventional dry-spinning spandex production process is generally as follows: first, PTMEG and MDI are used to pre-polymerize to form a prepolymer, and the prepolymer and a chain extender perform a chain extension reaction to form a high-molecular polymer, which is made by adding a solvent. Raw liquid, adding various additives to improve the performance of finished spandex yarn, defoaming, spinning and recycling solvent, and winding into finished product packaging. Spandex waste silk will be produced in the spandex production process of general dry spinning method. In the prior art, the processing of spandex waste silk is generally discarded and no longer utilized. Occasionally there is a method for recycling spandex waste silk to regenerate normal spand...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/94D01F1/10
Inventor 吴中虎
Owner 吴中虎