摘要:
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 sup-pression of the composites were investigated as well as related mechanisms. The results show that the limit ox-ygen 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/m2and 108.9 MJ/m2respectively,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.%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/m2,108.9 MJ/m2,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.