Silane-crosslinked halogen-free flame-retardant poly (ethylene-octene) elastomer (POE) compounds were prepared through a two-step melt-compounding method using Mg(OH)2 and Al(OH)3 as flame retardants,and its grafting rate was investigated in terms of different silanes and initiators.Mechanical properties,hot elongation performance,thermal decomposition behaviors and flame-retardant properties of the compounds were investigated by using a universal testing machine,a hot elongation tester,a thermogravimeter and a limiting oxygen index instrument.The results indicated that the silane-crosslinked POE initiated by dicumyl peroxide achieved a higher cross-linking degree than that by benzoyl peroxide.The crosslinking feasibility of POE with silane-crosslinking agents is in the order of vinyl trimethoxysilane＞vinyl triethoxysilane＞ γ-methacryloxypropyltrimethoxysilane.The silane-crosslinked flame-retardant POE achieved a higher limiting oxygen index and better mechanical properties than uncrosslinked ones.Moreover,POE/Mg(OH)2 compound obtained a higher char yield than POE/Al (OH)3 ones.The silanecrosslinked flame-retardant POE also presented more residual mass than uncrosslinked ones.%采用双螺杆挤出机和单螺杆挤出机以两步熔融共混法,制备了硅烷接枝交联乙烯-辛烯共聚物(POE)/氢氧化镁(MH)/氢氧化铝(ATH)复合材料.研究了不同硅烷和引发剂接枝交联POE的效率,用万能拉力试验机、热延伸试验仪、极限氧指数仪及热失重分析仪等研究了PP/MH/ATH复合材料的力学、热延伸、热失重和阻燃等性能.结果表明,过氧化二异丙苯引发硅烷接枝交联POE的凝胶含量高于过氧化苯甲酰,硅烷接枝交联POE的难易顺序为乙烯基三甲氧基硅烷＞乙烯基三乙氧基硅烷＞3-甲基丙烯酰氧基三甲氧基硅烷;阻燃剂用量一定时,交联阻燃POE的拉伸强度和断裂伸长率都低于非交联阻燃POE,交联阻燃POE的极限氧指数比未交联的高约1％;MH阻燃POE 600℃热分解残炭率高于ATH阻燃的,交联后阻燃POE的质量保留率比交联前高.
展开▼
