Abstract: The thermal insulation layer is one of the most important to firefighter uniform, and its performance directly affect the effects of flame burning. In order to better develop the insulating layer spunlaced nonwovens of light thin type, high temperature and flame resistant, which is used in the retardant fire protective clothing. This paper analyzes the thermostability and flame retardant performance, mechanics performance, air permeability, bending length ,moisture regain and washing performance of spunlaced nonwovens mixed with aramid1313, aramid1414 and polysulfonamide fiber at different blended ratio. The results show that: polysulfonamide spunlaced nonwovens has poor strength. And with the increasing content of polysulfonamide, the flame retardant performance of the nonwoven is better. Meanwhile, after being dealt with the high temperature, the appearance color of the nonwoven has a little change, and the stability of dimension is better. With the rising of temperature, fabric vertical and horizontal breaking strength shows the increasing tendency generally. And the breaking elongation decreases firstly and then increases, but the general trend declines in shock. Analyse comprehensive performances of all fabric, the third fabric is the optimum matching craft.

Key words: Aramid1313, Aramid1414, polysulfonamide, spunlaced nonwovens, high temperature resistance, flame retardancy