【摘要】 采用锥形量热仪(CONE)研究可膨胀石墨(EG)与聚磷酸铵(APP)对木粉/聚丙烯复合材料的协同阻燃作用。CONE测试结果表明:EG和APP均可降低木粉/聚丙烯复合体系的热释放速率(HRR)、总热释放(THR)和烟释放速率(RSR),提高成炭率;与APP相比,EG表现出更好的抑烟效果。当EG与APP的总添加量为15%、复配比例为2∶1时,能形成稳定致密的膨胀炭层,阻燃协同效应显著。力学性能测试结果表明:即使在马来酸酐接枝聚丙烯相容剂(MAPP)的存在下,EG和APP阻燃剂的添加对复合材料的冲击强度和弯曲强度仍有不利影响,但EG的添加可提高复合材料的弯曲模量。更多还原

【Abstract】 The synergistic flame-retardant effects of expandable graphite(EG) with ammonium polyphosphate (APP) in wood flour/polypropylene composites were investigated by cone calorimeter (CONE) under a heat flux 50 kW·m-2. The CONE results showed that both APP and EG decreased the heat release rate (HRR), total heat release(THR), release smoke rate(RSR) and increased the residual char of wood flour/polypropylene system, which indicate APP and EG are effective fire retardants for wood flour/polypropylene composites. However, EG flame retardant displayed the better smoke suppressing performance than that of APP. When the mass ratio of EG and APP was 2∶ 1, the incorporation of EG and APP had a positive effect on forming a compact and intumescent char layer with stabilized structure, and showed a good synergistic effect in flame inhibition and smoke suppression. The mechanical test results showed that, even in the presence of maleic anhydride grafted polypropylene copolymer (MAPP), the addition of APP and EG flame retardant also decreased the impact and flexural strength of composites, but EG improved the flexural modulus.更多还原