膨胀型阻燃剂和纳米黏土在聚丙烯树脂中协同作用的研究

Synergism Between Intumescent Flame Retardant and OMMT in PP

用熔融共混的方法制备了膨胀型阻燃剂(IFR)的含量为20%、25%和30%的聚丙烯(PP)/IFR阻燃复合材料以及IFR/纳米黏土(OMMT)含量为18.5%/1.5%、23.5%/1.5%、28.5%/1.5%的PP/IFR/OMMT纳米阻燃复合材料。研究了IFR和OMMT在PP基体中的协同阻燃作用以及对材料力学性能的影响,并探讨了协同阻燃机理。结果表明,PP/IFR/OMMT纳米阻燃复合材料比PP/IFR阻燃复合材料具有更高的极限氧指数和更低的热释放速率峰值,且当IFR的添加量为18.5%时(IFR/OMMT=18.5%/1.5%),材料就能够通过垂直燃烧UL 94V-0级别;对燃烧后的残炭进行分析,发现OMMT能在膨胀发泡过程中对泡孔起到支撑作用,使泡孔不易被气体冲破,从而使材料表现出更好的阻燃性能。

Polypropylene （PP）/intumescent flame retardant （IFR） composites and PP/IFR/organic montmorillonite （OMMT） nanocomposites were prepared by melt blending method. Synergistic effect between IFR and OMMT on flame retardant properties in PP matrix and the mechanical properties of the composites were investigated. The synergistic flame retardant mechanism was explored. It was observed that PP/IFR/OMMT nanocomposites had a higher oxygen index and a lower peak heat release rate than PP/IFR composites. Especially, the material reached UL 94 V-0 level when 18.5 % of IFR and 1.5 G OMMT were introduced. SEM mi ＂rograph of char residue after combustion showed that OMMT played a reinforcing effect on the cell, so that the PP/IFR/ OMMT nanocomposites exhibited better flame retardant performance than PP/IFR composites.