Abstract: The multi-layer film fabric for high-level chemical protective clothing was trial-produced using aramid fabric, polyester filament fabric and acrylic fabric as the skeleton layer, polyolefin film as the forming layer, and polyhalogenated olefin film as the barrier layer. The effect of fabric, polyolefin masterbatch and flame retardant types on mechanical property, flame retardancy, combustion behavior and thermal protection performance of the multi-layer film fabrics were investigated by electronic fabric strength machine, limit oxygen index meter, cone calorimeter and thermal protection performance tester. The results show that multi-layer film fabrics with aramid fabric and polyester filament fabric as skeleton layer have better mechanical properties. A higher flame retardancy can be achieved for the multi-layer film fabrics made from B/C-type polyolefin masterbatch and Y-type flame retardant. The multi-layer film fabrics with acrylic fabric as the skeleton layer has lower heat release and higher carbon residue, but its thermal protection performance is poor due to severe melting phenomenon during the testing process. In summary, the multi-layer film fabric trial produced with aramid fabric as the skeleton layer, polyolefin film prepared by C-type masterbatch and Y-type flame retardant as the forming layer, has the best comprehensive performance.

Key words: high-level chemical protective clothing, multi-layer film fabric, flame retardancy, mechanical property, thermal protection performance