PP/PVAc-OMMT纳米复合材料及其阻燃材料的燃烧性能

Combustion Properties of PP/PVAc-OMMT and Its Flame Retarded Nanocomposites

利用锥形量热仪(CONE)在35kW/m2热辐照条件下,并结合极限氧指数(LOI)和UL-94垂直燃烧测试方法对聚丙烯(PP)/聚醋酸乙烯酯(PVAc)-有机蒙脱土(OMMT)纳米复合材料和加入无卤复配阻燃剂制备的PP/PVAc-OMMT/氢氧化镁(MH)/三氧化二锑(AO)纳米复合阻燃材料的热释放速率、烟释放及材料在燃烧时的质量损失行为进行了研究。结果表明,添加10%(质量分数)PVAc-OMMT可以提高PP材料的阻燃性能,燃烧时的热释放速率、质量损失率以及烟释放量减少,且PVAc-OMMT与无卤复配阻燃剂之间可产生阻燃协效作用,使纳米复合阻燃材料的阻燃性能、热稳定性和抑烟性进一步增强。

The heat release rate, smoke emission and mass loss behavior of polypropylene（PP）/polyvinylacetate （PVAc）-organophilic montmorillonite（OMMT） nanocomposites and its flame retarded nanocomposites prepared of PP/PVAc-OMMT/magnesium hydroxide（MH）/antimony trioxide（AO） by additions of MH and AO as non-halogen flame retardants mixture were studied using cone calorimeter, limiting oxygen index（LOI） and UL-94 vertical burning test at 35 kW/m^2. It is found that the addition of 10% （mass fraction） PVAc-OMMT prepared via in suit interealative polymerization of vinyl acetate （VAt） and organophilic montmorillonite （OMMT） can increase flame retardancy of PP material, decrease the heat release rate, mass loss ratio and smoke emission measure during combustion, and a better synergistic flame retardant effect of PVAc-OMMT and MH/AO flame retarded mixture, further built up flame retardancy, thermal stability and smoke suppression.