Preparation method of melt spinning polyurethane fiber thin denier filament

Abstract

The method includes following steps. (1) With being added in the screw extruder, the thermoplastic polyurethane is melted and mixed. (2) The crosslinking agent is added in the metering section of the extruder or between the extruder and mixer. (3) The melted woven material through the nozzle plate is ejected, spun and wound. The invention solves the issue of the mating use between the thermoplastic polyurethane and the crosslinking agent and prevents the thermal degradationand the carbonization so as to obtain the product with excellent combination property.

Description

technical field [0001] The method for preparing fine-denier spandex filaments disclosed by the present invention refers to the preparation of melt-spun spandex filaments with deniers in the range of 10-30 deniers. Background technique [0002] In the prior art, melt-spun spandex generally includes two processes: [0003] The typical representative of the first process is the product of Kuraray Co., Ltd. in Japan. The elastic recovery rate of the fine-denier spandex yarn spun out of it is obviously low. This technology simplifies the production process on the surface, but it has high requirements on the thermal stability, hydrolysis stability and precise ratio of raw materials of thermoplastic polyurethane, and the elastic recovery rate is not high. The typical representative of the second process is Bell Spinning Company in Japan. The breaking strength of the inner melt-spun spandex filaments spun out by it is relatively low. In this technology, thermoplastic polyurethane w...

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Problems solved by technology

[0003] The typical representative of the first process is the product of Kuraray Company in Japan, and the elastic recovery rate of the fine-denier spandex yarn spun by it is obviously low

This technology simplifies the production process on the surface, but it has high requirements on the thermal stability, hydrolysis stability and precise ratio of raw materials of thermoplastic polyurethane, and the elastic recovery rate is not high.

The typical representative of the second process is Bell Spinning Company in Japan. The breaking strength of the inner melt-spun spandex filaments spun out by it is relatively low. In this technology, thermoplastic polyurethane with low molecular weight and viscosity can be used, which can avoid the raw materials in the process to a certain extent. Phenomena such as degradation and carbonization occur during the spinning process, but the end-capping compound releases small molecular compounds when it is unblocked, which affects the physical and mechanical properties of the obtained fiber on the one hand, and causes environmental pollution on the other hand

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