Abstract:

In order to explore the forming conditions for Lyocell fiber fibrillation, a sufficient theoretical basis was provided for expanding the application of high-fibrillation Lyocell fiber in filter fabrics, covering fabrics and absorbent lined pad. In this paper, sodium hypochlorite (NaClO) solution was used as oxidant and Lyocell fibers with different degrees of fibrillation were prepared by steaming treatment. The influence of NaClO solution concentration and heat treatment time on Lyocell fiber structure and properties were analyzed. The results show that within the scope of this experiment, the fibrillation degree of Lyocell fiber gradually increases and the polymerization degree gradually decreases, as the concentration of NaClO solution increases. When the concentration of NaClO solution (effective Cl^- concentration) is 1.5% and the heat treatment time is 180 s, the degree of fiber fibrillation is quite obvious and uniform. The treated fibers achieve a strong moisture absorption capacity, which is 135.8% higher than before. The fiber breaking strength is 3.69 cN/dtex, elongation at break 11.3%, maintaining high mechanical properties required by the intended applications. The process is proved to be less difficult and more efficient, beneficial to the application and industrialization of high-fibrillation Lyocell fibers in the fields of spunlace fabrics and blended manufacturing textile products.

Key words: Lyocell fiber, steam treatment, fibrillation, wet friction, water retention value