磷-硅阻燃剂协效氢氧化镁无卤阻燃EVA的研究

摘要

A phosphorus-silicon flame retardant （EMPZR） and magnesium hydroxide Mg （OH）2 were introduced into ethylene-vinyl acetate copolymers （EVA） as a composite flame retardant. It was found that the flame retardancy of the copolymer exhibited the best flame retardancy when the content of the composite flame retardant EEMPZR ： Mg（OH）2 =1 ： 41 was 50 wt %, the limiting oxygen index reached 36. 0%. TGA showed that the char yield was 32. 2 % at 600℃. The thermal mass loss rate of the composite decreased compared with neat EVA. All these suggested that there was a good synergistic effect between EMPZR and Mg（OH）2.%研究了磷-硅阻燃剂（EMPzR）与氢氧化镁[Mg（OH）2]对乙烯-醋酸乙烯酯共聚物（EVA）阻燃性能的影响。结果表明，复合阻燃剂的添加量为50％（质量分数，下同）时[EMPZR与Mg（OH）2质量比为1：4]，所制得的阻燃EVA材料的极限氧指数可达36．0％，并且复合材料的热失重速率较纯EVA有明显下降，成炭率显著提高，600℃时残炭量为32．2％；通过对极限氧指数测试前后阻燃EVA材料红外光谱的分析，证实了Mg（OH）。与EMPZR在EVA中具有良好的协效阻燃作用。