【摘要】 采用表面处理过的氢氧化铝(ATH)与氢氧化镁(MH)混合物(SAMH)(质量比2:1)、线型低密度聚乙烯(LLDPE)、马来酸酐接枝聚乙烯(PE-g-MAH)共混挤出制成母料,然后与聚酰胺6(PA6)共混挤出即母料法制备了PA6/SAMH/PE三元复合材料。当PA6/SAMH/PE三者质量比为50/30/20时,复合体系垂直燃烧通过了UL94V-0@3.2mm级,极限氧指数(LOI)为33.0%,冲击韧性较具有同样阻燃性能的PA6/SAMH二元体系提高了1倍,各组分一次性挤出则阻燃性能较差。采用热重分析(TGA)、扫描电子显微镜(SEM)对PA6/SAMH/PE三元体系的阻燃机理进行了探讨,发现母料法体系各组分界面作用强,燃烧炭层致密,残炭率高。更多还原

【Abstract】 Surface-treated aluminum hydroxide(ATH) and magnesium hydroxide(MH) mixture(SAMH),linear low density polyethylene(LLDPE) and polyethylene grafted by maleic anhydride(PE-MAH) were melt-kneaded and extruded to produce a flame-retardant masterbatch,and then was extruded with polyamide 6(PA6) to yield PA6/SAMH/PE(50/30/20 by mass ratios)ternary composite.The composite via masterbatch method passed UL94 V-0@3.2mm in vertical burning testing and the limiting oxygen index(LOI) attained 33.0%.The impact strength was twice of PA6/SAMH binary system with a same flame-retarded performance.The flame-retardancy of the composite was poor when all compositions were extruded synchronously.The flame-retarded mechanism of the ternary composites was investigated by thermogravimetric analysis(TGA) and scanning electronic microscope(SEM).It was found that a preferential interaction at the boundary between SAMH particles and PA6/PE polymer host of the composite via masterbatch method resulted in the occurrence of a compact burning carbon layer and a high carbon residue.更多还原