【摘要】 为提高金属氢氧化物/聚乙烯复合材料的韧性和阻燃性能，以滑石粉（Talc）为阻燃协效剂，马来酸酐接枝乙烯-醋酸乙烯酯共聚物（EVA-g-MAH）为增韧剂，通过双螺杆挤出机和注塑成型制备了氢氧化铝/氢氧化镁/线型低密度聚乙烯（ATH/MH/LLDPE）阻燃复合材料。通过拉伸、冲击、极限氧指数、垂直燃烧试验和扫描电镜研究了ATH/MH、EVA-g-MAH和Talc含量对阻燃LLDPE力学性能、阻燃性能和形貌的影响。结果表明：ATH/MH含量增加，ATH/MH/EVA-g-MAH/LLDPE的拉伸强度和阻燃性能增加，断裂伸长率和冲击强度明显降低。添加EVA-gMAH有利于树脂基体包覆和分散ATH/MH，可同时提高ATH/MH/LLDPE的韧性和阻燃性能。固定阻燃剂（ATH、MH、Talc）总含量为60%,3%～11%Talc部分替代ATH/MH使复合材料的极限氧指数提高1.4%～4.2%,Talc和ATH/MH具有协同阻燃效应，7%Talc部分替代ATH/MH使Talc/ATH/MH/EVA-g-MAH/LLDPE的断裂伸长率和冲击强度分别提高50.0%和13.4%。更多还原

【Abstract】 To improve the toughness and flame retardancy of metal hydroxide/polyethylene composites, talc(Talc) was used as a flame retardant synergist, maleic anhydride grafted ethylene-vinyl acetate copolymer(EVA-g-MAH) was used as a toughener, and the aluminum hydroxide/magnesium hydroxide/linear low density polyethylene(ATH/MH/LLDPE)flame-retardant composites were prepared by twin-screw extruder and injection molding. The effects of ATH/MH,EVA-g-MAH, and Talc content on the mechanical properties, flame retardancy, and morphology of flame-retardant LLDPE were studied by tensile test, impact test, limiting oxygen index test, vertical burning test, and scanning electron microscope. The results show that as the content of ATH/MH increases, the tensile strength and flame retardancy of ATH/MH/EVA-g-MAH/LLDPE increase, while the elongation at break and impact strength decrease significantly. The addition of EVA-g-MAH is beneficial to the resin matrix wrapping and dispersing of ATH/MH, which can improve the toughness and flame retardancy of ATH/MH/LLDPE simultaneously. When the total content of flame retardants(ATH, MH, Talc) is fixed at 60%, replacing 3%～11% of ATH/MH with Talc can increase the limiting oxygen index by 1.4%～4.2%, and Talc and ATH/MH have a synergistic flame-retardant effect. Replacing 7% of ATH/MH with Talc can increase the elongation at break and impact strength of Talc/ATH/MH/EVA-g-MAH/LLDPE by 50.0% and 13.4%, respectively.更多还原