棉织物的离子液体溶解法回收

采用2种咪唑氯盐类离子液体溶解回收棉织物,比较棉织物在2种离子液体中不同温度下的溶解度。研究溶解温度对溶解时间和再生纤维素聚合度的影响,表征不同溶解时间下再生纤维素膜的结构及性能。结果表明,该方法可有效地回收再利用棉织物,110℃下1-烯丙基-3-甲基咪唑氯盐溶解质量分数为4%的棉织物再生纤维素膜表面平整,结构致密,断裂强度和断裂伸长率分别为38.5 MPa和6%。随着溶解时间的延长,再生纤维素膜结晶度不断降低,热稳定性变差,力学性能也随之下降。

Recycling of cotton fabrics by ionic liquid dissolution process

Cotton fabrics were recycled by dissolving in two types of imidazole chloride salt ionic liquids. Compare the dissolution concentrations of cotton fabrics in these two ionic liquids at various temperatures. Effects of dissolving temperature on dissolving time and degree of polymerization were investigated. The structure and property of the regenerated cellulose films with different dissolving time were also characterized. The results showed that the cotton fabrics can be effectively reclaimed by this method. The surface of the regenerated cellulose film from cotton fabric with mass fraction of 4% dissolving in 1- allyl-3-methylimidazolium chloride at 110 °C was neat with compact and uniform fracture, and the breaking strength and elongation of the film were 38.5 MPa and 6%, respectively. The crystallinity and thermostability decreased with the extension of dissolving time, and then mechanical property accordingly decreased.