Abstract: A new hyperbranched aromatic amine triazine polymer was designed and synthesed by taking cyanuric chloride and Pphenylenediamine as raw material in acetone solvent, and its structure was confirmed by infrared spectroscopy. The intumescent flame retardant(IFR) which was composed of ammonium polyphosphate(APP) and the prepared hyperbranched polymer was used for the preparation of expansion flame retardant polypropylene (PP). Results showed that the target product was capable of excellent flame retardant and its carbon residue amount at 600 ℃ in N2 atmosphere was 44.8 %. The limiting oxygen index of PP was enhanced to 27.0 % from 17.5 % after proper addition of IFR, the heat release time was delayed by 625 s, and the peak of heat release rate was decreased by 85.7 %.

Key words: hyperbranch, aromatic amine, triazine, polypropylene, flame retardant