Flame-retardant anti-fibrillation Lyocell fibers prepared by online-treatment of coagulated filament

Lyocell fiber is a green synthetic fiber widely used in the twenty-first century. However, its flammability and fibrillation limit its further use. In this paper, we used online-treatment of coagulated fibers during spinning to obtain flame-retardant and anti-fibrillation Lyocell fibers with crosslinkers and flame retardants that penetrate the fiber surface easily and react more quickly with the cellulose molecular chains. The results of infrared spectroscopy, X-ray diffraction and birefringence showed that the coagulated filaments had more micropores, lower crystallinity and orientation compared to heat setting fibers. At lower concentrations of flame retardant (200 g/L) and cross-linking agent (60–80 g/L), the limit oxygen index (LOI) of Lyocell fibers treated on-line was about 30.2