硼-铝在膨胀型阻燃聚丙烯中的协同作用

Synergy of Boron-aluminium in Intumescent Flame Retardant PP

通过热分析和锥形量热分析研究了硼-铝在膨胀型阻燃聚丙烯(PP)中的协同作用。热分析表明,在膨胀型阻燃剂KDIFR中,引入铝元素,由于催化脱水促进降解的作用,使剩炭率降至14.6%;引入硼元素,由于促进可燃小分子的生成,催化降解,也使剩炭率降至5.9%;硼铝共存时二者之间的协同作用可以降低在高温区的降解速率,提高剩炭率至19.7%;PP/KDIFR的锥形量热分析表明,铝元素增大了释热速率、释热总量、CO、CO2和烟释放量;硼元素燃烧前期能减少释热速率、释热总量、CO和CO2释放量,有明显的抑烟作用,使阻燃效果略有提高。硼铝共存显著降低释热速率、释热总量、CO、CO2和烟释放量,明显提高了阻燃效果。

The synergy of boron-aluminum in intumescent flame retardant PP was studied using thermal analysis and cone calorimeter. The thermal analysis showed that when introducing aluminum into KDIFR, the charred residue was reduced to 14. 6 % owing to catalytic dehydration; when adding boron in KDIFR, the charred residue was reduced to 5.9 % because boron can promote the generation of small combustible molecule and catalytic degradation. When B-Al co-existing, the decomposition rate in the high temperature zone reduced, and the charred residue increased to 19.7 %. The cone calorimeter showed that the addition of either aluminum or boron increased the heat release rate, total heat release, CO, CO2 and smoke emissions, with boron being more effective in pre-combustion and smoke inhibition. The co-existing of B-Al in the KDIFR can reduce heat release rate, total heat release, CO, CO2 and smoke emissions significantly and enhance the flame retardant effect greatly.