Study on flame retardant modification of ramie fabrics by ultraviolet grafting

Flame retardant modified ramie fabrics were prepared by grafting glycidyl methacrylate( GMA) via ultraviolet,followed by amination using ethylene diamine and phosphorylation. The influence of illumination time,concentration of the intiator benzophenone( BP),and concentration of GMA on the grafting yield was investigated. The grafting yield of GMA increased with the increase of illumination time and the concentrations of GMA and BP. The grafting yield reached 35. 61% when the concentrations of BP and GMA were 0. 3 mol / L and 30%( V / V),respectively,grafting for 20 min. Phosphorus modified ramie fabrics promoted the formation of charcoal in combustion process of ramie fabrics and thereby improved the flame retardance of the ramie fabrics significantly. The LOI of the ramie fabrics with grafting yield of GMA 50. 65% after amination and phosphorylation reached 38. 6%.