A method for preparing coarse-denier spandex fibers for sanitary materials by utilizing spandex waste silk

Abstract

The invention belongs to the field of material preparation, and relates to a preparation method for coarse denier spandex fiber, in particular to a method for preparing coarse denier spandex fiber for a hygienic material by adopting spandex silk waste. The method comprises the following steps: (1) pre-processing; (2) pre-polymerizing; (3) polymerizing; (4) spinning. In the preparing process of spandex fiber, as the spandex silk waste is treated by a cosolvent, a silicone oil removing additive and a catalyst respectively according to the method, the stable period of a prepared polymer solution is greatly improved, and is longer than 20 days, the fluidity of a polymer stock solution prepared from the spandex silk waste is improved, gelatin in the polymer stock solution is reduced, the spinnability of the polymer stock solution is improved, and the hard segments and the soft segments of the spandex fiber molecular chains obtained by adopting the method are enabled to be structured and ordered.

Description

technical field [0001] The invention belongs to the field of material preparation, and relates to a method for preparing coarse-denier spandex fibers, in particular to a method for preparing coarse-denier spandex fibers for hygienic materials by utilizing spandex waste silk. Background technique [0002] Spandex is widely used in textile, biomedical and other fields due to its excellent elasticity and physical and mechanical properties. In recent years, the spandex industry has developed rapidly, and the output of spandex in my country has exceeded 600,000 tons per year. [0003] At the same time, a large amount of waste silk has also been produced in the production and use of spandex. Currently, landfill and incineration are used to deal with these waste silks, which not only wastes a lot of chemical raw materials, but also causes land waste and air pollution, which is not in line with the global sustainable development strategy. [0004] With people's increasing attentio...

AI Technical Summary

Problems solved by technology

However, these components will accelerate the degradation rate of the raw solution of spandex waste silk, which will cause the abnormal breakage of the polyurethane molecular chain during the secondary dissolution process of the spandex waste silk, and the molecular weight distribution range will be wider, resulting in poorer processability than the normal raw solution.

[0006] The poor stability of the spinning stock solution is manifested in two aspects. On the one hand, it will accelerate the degradation, and the macromolecular chain will be severely damaged. The reaction is that the apparent viscosity is too low. In addition, some groups will undergo cross-linking reaction to produce gel particles that cannot be dissolved in the system. These particles are elastic and can pass through under a certain pressure during the spinning process. The filter enters the spinneret assembly for spinning, and when it passes through the spinneret hole of the spinneret, it will block the spinneret hole, resulting in the interruption of the polymer stock solution, and it is also difficult to process continuously.