长余辉发光Lyocell纤维的制备与性能研究

Study on the preparation and properties of the long afterglow luminescent Lyocell fibers

通过采用不同偶联剂对长余辉发光粉末进行表面处理,比较其在NMMO水溶液中的沉降性变化,优选出合适的钛酸酯偶联剂以提高发光粉在NMMO水溶液中的分散稳定性,并采用干湿法纺丝,成功制备了长余辉绿色发光Lyocell纤维。结果表明,通过对发光粉的偶联剂处理,所得发光Lyocell纤维强度略有提高。随着发光粉含量的增加,纤维的热性能和结晶度有所降低,初始发光亮度提高。当发光粉含量>10%(质量分数)时,纤维的衰减时间常数迅速增大,余辉性能提高。

In this paper,different coupling agents were used to modify the luminescent powder and the change of sedimentation properties of luminescent powder in aqueous NMMO solution was compared,and then a suitable titanate coupling agent was chosen to improve the dispersion stability of luminescent powder in NMMO solution.Moreover,the long afterglow luminescent Lyocell fibers were spun by the dry-jet wet spinning process.The results showed that the tensile strength of fibers was improved after the treatment of the coupling agent.With the increase of luminescent powder content,the degree of crystallinity and the thermal property of fibers were decreased slightly,whereas the initial luminescent intensity was improved.When the content of the uminescent powder was more than 10wt%,the afterglow decay-time constants of luminescent Lyocell fibers were increased significantly,and the afterglow property of fibers was improved.