化学交联EVA/NBR阻燃复合材料的燃烧行为及力学性能  

Investigation on Flame Retardancy and Mechanical Property of Chemical Cross-linked EVA/NBR Composites

作　　者：邹欢[1] 谷晓昱[1] 孙军[1] 刘喜山[1] 董明哲[1] 张胜[1] 

机构地区：[1]北京化工大学碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《中国塑料》2013年第6期28-32,共5页China Plastics

摘　　要：以乙烯-醋酸乙烯共聚物(EVA)/丁腈橡胶(NBR)为主体,氢氧化镁[Mg(OH)2)]和红磷(RP)为阻燃剂制备了无卤阻燃EVA/NBR复合材料,通过力学性能测试、热重分析以及燃烧行为表征(极限氧指数和锥形量热分析)研究了交联剂过氧化二异丙苯(DCP)以及马来酸酐接枝乙烯-醋酸乙烯共聚物(EVA-g-MAH)对EVA/NBR复合材料的力学性能、热稳定性和阻燃性能的影响。结果表明,含有10份相容剂EVA-g-MAH的交联材料,其拉伸强度可达到17.4MPa,断裂伸长率可达到1236%;材料的热分解温度从321.6℃提高到327.0℃,残炭量从10%提高到了32.1%;极限氧指数达到33.5%且热释放速率峰值从941kW/m2降到了690kW/m2;通过扫描电子显微镜对复合材料的断面形貌进行了观察分析,发现材料断裂表面填料分散均匀。In this paper, halogen free flame retardant EVA/NBR composites containing magnesium hydroxide [-Mg（OH）2＋ and red phosphorus （RP） were prepared via melt blending through a two-roll mill. Limiting oxygen index, cone calorimeter, tensile test, and thermal gravimetric analysis were used to characterize the dfect of dicumyl peroxide （DCP） and maleic anhydride grafted ethylene-vinyl acetate copolymer（EVA-g-MAH） on the flammability, mechanical properties, and thermal behavior of EVA/ NBR composites. The limiting oxygen index value reached 38. 4% and the heat release rate decreased from 941 to 690 kW/m2 ; the tensile strength reached 17. 4 MPa, and elongation at break increased to 1236 % the starting mass loss temperature increased from 321.6 to 327. 0 ℃, and the residual mass increased from 10% to 32. 1% at the presence of 10 phr EVA-g-MAH after cross-linking. The morphology of cryogenically fractured surface was observed and analyzed using scanning electron microscope （SEM） and it showed that the fractured surface was compact and fillers disperse evenly.

关 键 词：乙烯-醋酸乙烯共聚物 丁腈橡胶 交联 阻燃 

分 类 号：TQ317[化学工程—高聚物工业]