氢氧化铝/氢氧化镁复配提高乙烯-醋酸乙烯共聚物阻燃性能

Improvement of Flame Retardancy of Ethylene-vinyl Acetate Copolymer with Al(OH)_3 and Mg(OH)_2

研究了不同质量比的氢氧化铝(ATH)和氢氧化镁(MH)对乙烯-醋酸乙烯共聚物(EVA)燃烧性能的影响,通过极限氧指数测试、垂直燃烧测试、热失重分析和锥形量热测试研究了EVA/ATH/MH复合材料的阻燃性能和热稳定性。结果表明,固定ATH和MH的添加量为60%(质量分数,下同),ATH/MH=2/1(质量比,下同)时,EVA/ATH/MH复合材料的阻燃性能最好,极限氧指数从18.3%提高到34.3%,达到UL 94V-2级别,热释放速率和热释放总量均有明显下降。

Effect of different mass ratios of aluminum hydroxide（ATH）and magnesium hydroxide（MH）on combustion characteristics of ethylene-vinyl acetate copolymer（EVA）-based composites was investigated by limiting oxygen index（LOI）,vertical burning test,thermogravimetric analysis,and cone calorimeter.The results demonstrated that the composites achieved the optimum flame retardancy with addition of ATH/MH mixture at the mass ratio of 2∶1,and their LOI values increased from 18.3 vol % to 34.4 vol %.Meanwhile,flame retardancy of the composites achieved a V-2classification in UL-94 vertical burning test.The cone experiments indicated that heat release rate and total heat release rate of the composites were reduced significantly.