关键词: 聚丙烯, 膨胀阻燃剂, 热失重分析, 锥形量热仪, 体视显微镜

Abstract: In this paper, the flame retardancy and mechanical properties of polypropylene（PP）were tested by differential scanning calorimetry（DSC）,thermogracimetic analysis（TG）,cone calorimetry, and stereo microscope. It was found that as the content of IFR-3 increased, the tensile strength and charpy notch impact strength increased first, and then decreased; flame retardant IFR-3 increased the crystallization temperature and melt temperature, and decreased the decomposition temperature, increased the residual mass. The limiting oxygen index of PP increased with increasing content of flame retardant IFR-3. When IFR-3 was 30 and 35 phr, PP/IFR-3 specimen gave rise to a UL 94 V-0 rating at 3.2 and 1.6 mm, respectively. IFR-3 could also decreased the heat release rate（HRR）and smoke produce rate（SPR）of PP.

Key words: polypropylene, phosphor-nitrogen intumescent, flame retardant, cone calorimetry, stereo microscope