Method for efficiently regenerating spandex filament by dry spinning waste spandex filament

A high-efficiency regeneration technology of spandex waste silk, which is applied in the field of spinning, can solve the problems of unsatisfactory stability of finished products, high energy and material consumption, discarding and no longer using, etc., so as to alleviate the impact of additives on the environment and improve a The effect of equal product rate and process cost saving

Inactive Publication Date: 2017-05-31
绍兴柯桥中兴化纤原料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the treatment of spandex waste silk is generally discarded and no longer used. Occasionally, there is a method of recycling spandex waste silk to regenerate normal spandex silk. However, there are problems of high energy consumption and material consumption, low pass rate, and the stability of the finished product. can not meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for dry-spinning spandex waste silk to efficiently regenerate spandex yarn, comprising the following steps:

[0030] Step 1), aging the spandex waste silk, in N 2 It was heated to 120°C in an atmosphere of air and kept for 12 hours, and the humidity was controlled at 10%.

[0031] Step 2), at about 10°C, pulverize the spandex waste silk into ultra-short spandex waste silk fibers with a fiber length of ≤30 mm.

[0032] Before crushing, additives and foreign matter are attached to spandex waste; after crushing, spandex waste ultra-short fibers are separated from additives and foreign matter. Auxiliaries and foreign matter are smaller than ultra-short fibers in volume and weight, so the ultra-short fibers can be further purified through a negative pressure filter, and of course, the two can also be separated by other means. For example, when crushing, additives and foreign matter float, and the two can be separated by controlling the wind speed and setting a fil...

Embodiment 2

[0043] A method for dry-spinning spandex waste silk to efficiently regenerate spandex yarn, comprising the following steps:

[0044] Step 1), aging the spandex waste silk, in N 2 Heated to 70°C in an atmosphere of air and maintained for 17 hours, and the humidity was controlled at 35%.

[0045] Step 2) At about 0°C, the spandex waste is crushed into ultra-short spandex waste with a fiber length of ≤30mm.

[0046] Step 3), drying the ultra-short spandex waste silk fibers, and controlling moisture, so that the moisture content of the ultra-short spandex waste silk fibers is 1.0%.

[0047] Step 4), add DMAC and spandex waste ultra-short fibers into the reactor, and react at 100°C for 10 hours to obtain a spinning stock solution with stable characteristics; the mass ratio of DMAC and spandex waste ultra-short fibers is 1:1 .

[0048] Step 5) After filtering, defoaming, aging, spinning, twisting, oiling and winding, the finished spandex yarn is obtained.

[0049] The rest are the...

Embodiment 3

[0051] A method for dry-spinning spandex waste silk to efficiently regenerate spandex yarn, comprising the following steps:

[0052] Step 1), aging the spandex waste silk, spraying the aqueous solution of end-blocking polyether modified polysiloxane with a mass fraction of 1% and spraying it on the spandex waste silk, in N 2 Heated to 110°C in an atmosphere of air and maintained for 12 hours, and the humidity was controlled at 10%. The end-blocking polyether-modified polysiloxane accounts for 2% of the mass of spandex waste silk.

[0053] Under the action of aging, the end-capped polyether-modified polysiloxane adsorbed on the surface of spandex waste and gradually diffused into the interior of spandex waste. The capped polyether-modified polysiloxane on the surface of spandex waste silk is used to absorb oil and remove it in the crushing stage. The end-blocking polyether modified polysiloxane inside the spandex waste participates in changing the properties of the spandex fi...

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Abstract

The invention discloses a method for efficiently regenerating a spandex filament by a dry spinning waste spandex filament, and belongs to the technical field of spinning. The method comprises the following steps: 1) carrying out curing processing on the waste spandex filament, heating at the environment of N2 gas and keeping the temperature; 2) smashing the waste spandex filament into waste spandex filament ultrashort fibers of which the fiber length is less than or equal to 30mm; 3) drying the waste spandex filament ultrashort fibers to enable the waste spandex filament ultrashort fibers to own a certain moisture content; 4) adding DMAC (Dimethylacetamide) and the waste spandex filament ultrashort fibers into a reaction still to obtain spinning stock solution with stable characteristics; 5) carrying out filtering, defoaming, ripening, spinning, twisting, oiling and winding on the spinning stock solution to obtain the finished product spandex filament. The regenerated spandex filament produced by the method has stable performance index and high spinning speed. According to the method, through ripening and control for the moisture content of the waste spandex filament, the stability of the waste spandex filament is improved so as to reduce a situation of fracture of wire and the like and effectively improve the spinning speed and the first-class rate of the spandex filament.

Description

technical field [0001] The invention belongs to the technical field of spinning, and in particular relates to a method for efficiently regenerating spandex yarn from dry spinning spandex waste yarn. Background technique [0002] Spandex is an elastic fiber made of a polymer compound with a linear segment structure containing more than 85% polyurethane. Because it has advantages that other fibers cannot match, such as light specific gravity, high breaking strength, and elongation at break High, elastic recovery, etc., spandex fiber has been widely used in various fields. [0003] The main process used in the production of spandex is dry spinning, and the output of dry spinning is about 80% of the world's total spandex production. The main process of producing spandex by dry spinning is as follows: Polyether diol and diisocyanate form a prepolymer at a molar ratio of 1:2 under certain reaction temperature and time conditions. After the prepolymer is dissolved in a solvent, ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/94D01F6/70
CPCD01F6/94D01F6/70
Inventor 俞宗宝
Owner 绍兴柯桥中兴化纤原料有限公司
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