Study on Novel Intumescent Flame Retardant and its Modified Polypropylene

Using phophorus pentoxide,phosphoric acid,pentaerythritol and melamine as raw materials,a new type of intumescent flame retardant(IFR) was synthesized.IFR with ammonium polyphosphate(APP) and polyfluortetraethylene(PTFE),processed polypropylene(PP) was flame retarded.The thermal property of flame retardant PP was studied with thermogravimetry(TG).Using oxygen was analyzer,PP's limited oxygen index(LOI) was measured.Using vertical combustion method,its combustion level was judge.When the IFR reached 24%,LOI was 30.9%.Using tapered calorimeter,with the combustion performance of flame retardant PP,and the carbon residue structure of the flame retardant pp with scanning electron microscope(SEM) was observed.The result was that this complex flame retardants can help PP forming carbon layer,and had eximious flame retardant PP performance.