Study on Application of Novel P-N Intumescent Flame Retardant in Polypropylene

In this work,a flame retardant system containing P-N intumescent flame retardant(melamine phosphate,IFR),ammonium polyphosphate(APP),and polytetrafluoroethylene(PTFE) was applied in polypropylene(PP).The burning property of the IFR/APP/PTFE system flame retarded PP was tested by limited oxygen index and UL 94 measurement.Using thermogravimetric,Fourier transform infrared spectroscopy,scanning elecreon microscope,and X-ray photoelectron spectroscopy,the burning property,thermal degradation process,and the components of residual carbon of flame retarded PP were analyzed,and the flame retardancy mechanism of PP/IFR/APP/PTFE system was studied.It showed that the IFR/APP/PTFE flame retardant system showed significant synergistic effect,and the PP/IFR/APP/PTFE could reach a limited oxygen index value of 30.1 % and UL 94 V-0 with only 24 % IFR/APP/PTFE flame retardant(APP 6 %,IFR17.5 %,PTFE 0.5 %).In addition,the thermal stability of PP was improved by the introduction of the flame retardant.