Study on synthesis and application of Lyocell fiber flame retardant
In order to prepare a flame retardant for Lyocell fiber containing multiple flame retardant elements at the same time,dimethylol dihydroxy ethylene urea was modified by phosphoric acid and urea at high temperature to ob-tain a flame retardant agent containing nitrogen and phosphorus at the same time,and the flame retardant finishing of Lyocell fiber was carried out with it.By optimizing the concentration of flame retardants and catalysts,soaking time,pH of finishing solution,baking temperature and baking time,the limiting oxygen index and breaking strength of the flame-retardant finished Lyocell fiber reached 36%and 2.80 CN,and it still has good flame retardancy after washing with 10 g/L sodium carbonate and at 25 ℃ and 90 ℃ for 30 min.