Preparation and Study of Flame-Retardant Polyurethane Based on Copper Tailings and Ammonium Polyphosphate
Rigid polyurethane foam/ammonium polyphosphate/copper tailings(RPUF/APP/CTS)composites were prepared by a one-step all-water foaming method using ammonium polyphosphate(APP)/copper tailings(CTS)as the flame-retardant system.Flame-retardant tests show that the limiting oxygen index(LOI)of RPUF-30APP reaches 24.0%and RPUF-30APP shows a V-0 level in vertical flame test,indicating the significantly enhanced flame retardancy of the composites.The cone calorimetric tests show that the peak heat release rate(PHRR)of RPUF-30APP is 139.4 kW/m2.Compared with pure RPUF exhibiting a PHRR value of 300.5 kW/m2,the PHRR value of RPUF-30APP shows a reduction of 53.6%.Compared with pure RPUF exhibiting a total heat release(THR)value of 40.0 MJ/m2,the THR value(28.1 MJ/m2)of RPUF-30APP is decreased by 29.8%,suggesting that the APP/CTS system can significantly decrease heat release of the composites during combustion and enhance the composite fire safety.The carbon residue test shows that CTS/APP/RPUF composite materials form dense char layers during combustion,improving the flame retardancy of the composites.This work provides a new application field for CTS and paves a novel approach to enhance the fire safety of polymers.
万方数据
维普
