PROPERTIES OF WASTE FIBER/POLYURETHANE FLAME RETARDANT INSULATION BOARD

In order to solve the recycling problem of waste fibers, waste fiber/polyurethane flame retardant insulation board was prepared by blending- hot pressing method with waste cotton fiber, discarded polyurethane, AC (azodimethylamide) foaming agent and APP (ammonium polyphosphate) flame retardant as raw materials. The necessary conditions to the optimized technology was mass fraction of waste fibers 10%, mass fraction of AC foaming agent 3%, mass fraction of APP flame retardant 15%, hot pressing pressure 7MPa, hot pressing temperature 180℃, length of waste fibers 20mm, mixing temperature 175-180℃, hot pressing time 8min, cool-down time 2h, which were optimized by thermal conductivity coefficient, limit oxygen index and mechanical properties.The flame retardant mechanism and effect of the waste fiber/polyurethane flame retardant insulation board was analyzed by TGA (Thermogravimetric Analysis) and residual carbon ratio. Finally, the abaqus finite element simulation software was used to simulate the thermal conduction process and verify the correctness of model.