Modified intumescent flame retardants (MIFRs) and polysiloxane (APID) have been used in combination to enhance the flame retardancy of polypropylene (PP). The IFR system was composed of melamine (MEL), ammonium polyphosphate (APP) and pentaerythritol (PER). Aimed to improve the thermal stability of the IFR and its dispersivity in PP, titanate coupling agent NDZ‐201 was used to modify the IFRs via ball milling. MIFRs and APID have a cooperative effect on the flame retardant properties of PP. With 25 wt.% of MIFR and APID, the flame retardant sample (PPMA) was rated V0 for UL‐94, the LOI value was 34.3%, and the peak heat release rate (PHRR) was reduced by 80% in cone calorimeter test. In addition, APID could improve the compatibility of MIFR with the PP matrix, thereby increasing the mechanical properties of PP blends. The flame retardant effect of APID and MIFR in PP was presented in the condensed phase resulting in a rigid, thermally stable and expanded carbon layer due to different char structures.

中文翻译：

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钛酸酯偶联剂和聚硅氧烷大大提高了膨胀型阻燃剂的效率

改性膨胀型阻燃剂（MIFRs）和聚硅氧烷（APID）已结合使用，以增强聚丙烯（PP）的阻燃性。IFR系统由三聚氰胺（MEL），聚磷酸铵（APP）和季戊四醇（PER）组成。为了提高IFR的热稳定性及其在PP中的分散性，使用钛酸酯偶联剂NDZ-201通过球磨对IFR进行改性。MIFR和APID对PP的阻燃性能具有协同作用。含25％（重量）的MIFR和APID，阻燃样品（PPMA）的UL-94等级为V0，LOI值为34.3％，峰值热量释放率（PHRR）在锥形量热仪测试中降低了80％ 。此外，APID可以改善MIFR与PP基体的相容性，从而提高PP共混物的机械性能。