Convenient method for recycling waste spandex filament to spin

Abstract

The invention relates to a convenient method for recycling waste spandex filaments to spin. The method comprises the following steps: stirring and dissolving a certain proportion (weight) of clean waste spandex filaments, newly-prepared raw polyurethane stoste and DMAC(dimethylacetamide) or DMF(dimethyl formamide) solvent at a certain temperature to obtain crude stoste; then filtering, defoaming, stirring and curing the crude stoste so as to obtain final spinning stoste; finally transporting the spinning stoste to a spinneret plate by a gear pump; and in a high temperature channel, volatizing the solvent in the stoste along the radial direction of the channel so as to be solidified into filaments to obtain polyurethane fibers (spandex). The dissolving process of the method is simple and rapid, the viscosity of the stoste is stable and controllable, no functional auxiliary materials (a delustering agent, an antioxidant, a lubricant and the like) need to be added in the waste filament recycling and re-spinning process, so that the method has the advantages of simple production process, low investment and the like and is controllable. In addition, the secondary influence on the environment caused by the waste filament processing is avoided, and meanwhile the purposes of reducing the production cost and improving the economic benefits are achieved.

Description

technical field [0001] The invention relates to a simple method for recycling and respinning spandex waste silk. The method is to dissolve and spin spandex waste silk again, and belongs to the technical field of polyurethane fiber. Compared with other methods, this method has the advantages of quick and easy dissolution process, no need to add other spandex auxiliary materials, and thus has the advantages of simplicity and less investment. Background technique [0002] Spandex is the abbreviation of polyurethane elastic fiber, which has good elastic properties (elongation of 500% to 800%) and breaking strength, so it is widely used in the field of textiles. According to different production methods, spandex can be divided into dry method, wet method, melting method, chemical reaction method and other methods. All of them first stretch the stock solution or solution into filaments, then wind the filaments, and finally obtain the finished spandex filament rolls. Because a lo...

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Problems solved by technology

[0003] At present, some spandex producers have carried out research work on recycling, dissolving and respinning spandex waste silk, and achieved certain research results. However, these methods all have the disadvantages that the dissolution process takes a long time and requires a certain amount of new spandex auxiliary materials ( Disadvantages such as matting agents, antioxidants, lubricants, etc.)

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