Analysis of flame-retardant property of hemp needle felt

The environmentally friendly flame retardant of magnesium hydroxide(Mg(OH)_2) was used in the flame?-retardant finishing of hemp needle felt,and the optimal technology is: mass concentration of flame retardant is 300 g/L,volume concentration of binder is 20%,and the soaking time is 20 min.The flame-retardant property of the hemp needle felt treated by this process was analyzed by means of cone calorimetric analysis,and the results showed that the peak of heat release rate of the felt decreased by 61.6%,average heat release rate decreased by 62.6%;the total heat release and the effective burning at the early burning stage reduced remarkably;ignition time delayed for 18 s,fire occurance index enhanced by 3 times.It can be concluded that: environment friendly flame retardant Mg(OH)_2 has rendered good flame-retardant property to the treated hemp needle felt.