An efficient halogen-free composite flame retardant (CFR) consisting of an aluminum tri-hydroxide (ATH) core and a aluminophosphate shell with hierarchical flower-like structure was synthesized by a in-situ growth method. Through blending CFR,ATH and physical mixture (PM) of ATH and aluminophosphate with polyethylene (PE) respectively,PE/CFR,PE/PM and PE/ATH composites were prepared by mixing and compression molding. The mechanical properties and flame retardancy of the three kinds of composites were compared. The results show that the elongation at break of PE/CFR composite is obviously higher than that of the other two composites. When the mass fraction of flame retardant is 55%,compared with PE/PM and PE/ATH com-posites,the breaking elongation of PE/CFR composite increased by 213% and 296% respectively and the vertical burning level of the PE/CFR composite can achieve V–1 level,while the PE/PM and PE/ATH composites don't pass the vertical burning test,the peak values of heat release rate and smoke product rate of PE/CFR are significantly lower than those of the other two composites, which are 164 kW/m2and 0.028 m2/s,respectively. The PE/CFR composite can be used for the inner insulation material of wire and cable.%采用原位生长法合成了一种由氢氧化铝(ATH)核和多级花状结构磷酸铝壳组成的高效无卤复合阻燃剂(CFR),将CFR,ATH和磷酸铝的物理混合物(PM)及纯ATH分别与聚乙烯(PE)共混,通过密炼模压的方法制备PE/CFR,PE/PM和PE/ATH复合材料,对比了这3种复合材料的力学性能和阻燃性能.结果表明,PE/CFR复合材料的断裂伸长率明显高于其它两种复合材料,当阻燃剂质量分数为55%时,其比PE/PM和PE/ATH复合材料分别提高了213%和296%,且其垂直燃烧等级可达到V–1级,而PE/PM和PE/ATH复合材料均未通过垂直燃烧性能测试,另外,PE/CFR复合材料的热释放速率峰值和烟雾产生率峰值较其它两种复合材料大幅降低,分别为164 kW/m2和0.028 m2/s,可用于电线电缆内层绝缘层材料.
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