【摘要】 以氧化铝工业生产过程中产生的废渣赤泥为原料,采用共沉淀法构筑Mg-Al-Fe三元水滑石(LDHs)。以LDHs为阻燃剂,将三聚氰胺聚磷酸盐(MPP)作为协效剂,采用熔融共混的方法与乙烯-乙酸乙烯共聚物(EVA)制得EVA/LDHs/MPP复合材料,研究了EVA/LDHs/MPP复合材料的燃烧特性和抑烟特性,并初步探讨了相应的阻燃及抑烟作用机理。结果表明:ELM3(EVA的质量分数为50%,LDHs的质量分数为45%,MPP的质量分数为5%)的极限氧指数最高,为27.9%;ELM4(EVA的质量分数为50%,LDHs的质量分数为43%,MPP的质量分数为7%)的热释放速率峰值、总热释放(THR)均最低,分别为232.8 kW/m~2,108.9 MJ/m~2,与EVA/LDHs相比,THR、烟密度均显著降低,表明MPP对LDHs表现出较好的协同阻燃及抑烟性能。更多还原

【Abstract】 The red mud of waste slag,released from the process of alumina commercial production was used as feedstock to produce Mg-Al-Fe ternary layered double hydroxide(LDHs)via coprecipitation method. LDHs was then applied as flame retardant with ethylene vinyl acetate(EVA),melamine polyphosphate(MPP)as synergistic agent to produce EVA/LDHs/MPP composites via melt blending. The combustion and smoke suppression of the composites were investigated as well as related mechanisms. The results show that the limit oxygen index of ELM3(in which the mass fraction of EVA,LDHs and MPP are 50%,45% and 5%)is highest of 27.9%. The peak heat release rate and total heat release(THR)of ELM4(in which the mass fraction of EVA,LDHs and MPP are 50%,43% and 7%)are minimum of 232.8 kW/m~2 and 108.9 MJ/m~2 respectively,whose THR and smoke density are much lower than those of EVA/LDHs,which represents synergistic flame retarding and smoke suppression of MPP to LDHs.更多还原