再生聚氨酯薄膜的制备及性能

Preparation of recycled polyurethane films and their properties

以废旧棉氨混纺面料为原料,采用N,N-二甲基乙酰胺(DMAC)对氨纶进行溶解,再过滤掉溶解体系中的未溶物,将溶剂蒸发制成聚氨酯弹性薄膜。对再生聚氨酯薄膜进行红外光谱、X射线衍射、热学性能、断裂强力和水接触角分析。研究结果表明:红外光谱吸收峰的峰形与标准聚氨酯薄膜基本一致,吸收峰均为聚氨酯的特征峰;X射线衍射的峰形基本与标准聚氨酯薄膜相同,没有发生明显的位移;热重分析显示,随着温度的升高,再生聚氨酯薄膜出现明显的热失重现象,出现最大分解率时的温度为423℃;再生聚氨酯薄膜断裂伸长率高达1 012.38%,水接触角正反面均在95°以上,具有优异的弹性和良好的防水性能。

Taking waste cotton-ammonia blend fabrics as raw material, N,N-Dimethylacetamide(DMAC) is used to dissolve the spandex, and then the insoluble matter in the dissolved system is filtered out, and the solvent is evaporated to make polyurethane elastic film. The chemical structure and characteristics of regenerated polyurethane films are analyzed by infrared spectroscopy, X-ray diffraction, thermal properties, breaking strength and water contact angle. The results show that the peak shape of the absorption peak of the infrared spectrum is basically the same as that of the standard polyurethane film, and the absorption peak is the characteristic peak of polyurethane;The peak shape of X-ray diffraction is basically the same as that of standard polyurethane film, and there is no obvious displacement;The thermogravimetric analysis show that with the increase of temperature, the regenerated polyurethane film appears obvious thermogravimetric phenomenon, and the temperature at the time of the maximum decomposition rate is 423 ℃;The elongation at break of the regenerated polyurethane film is as high as 1 012.38%, and the water contact angles both on the front and back sides are above 95°, which shows excellent elasticity and good waterproof performance.