聚磷酸蜜胺与八钼酸蜜胺阻燃PA6的燃烧行为及协同作用

采用聚磷酸蜜胺(MPP)和八钼酸蜜胺(MOM)复合物阻燃PA6,测定了阻燃PA6的氧指数(LOI)、UL 94V阻燃性及热稳定性.用傅里叶变换红外光谱(FTIR)和SEM技术分析了阻燃PA6的热分解残余物,以锥形量热仪测定了阻燃PA6与火灾有关的阻燃参数,包括释热速度、质量损失速度、有效燃烧热、比消光面积等,并测定了阻燃PA6残炭表面的元素组成及XPS曲线拟合数据.结果表明,MPP-MOM复合物添加量为27%时(质量分数),PA6的阻燃性能达UL 94V-0级,氧指数为35.3%;PA6的释热速度峰值、释热速度平均值、总释热量、有效燃烧热以及质量损失速率明显下降,同时也证明了MOM具有好的协同阻燃效应.

Combustion Behavior and Flame Retardant Synergism of PA6 Flame-Retarded with Melamine Polyphosphate and Melamine Octomolybdate

PA6 was flame-retarded with melamine polyphosphate (MPP) and melamine octomolybdate (MOM). The limiting oxygen index, UL 94V flame retardancy and thermal stability of the flame-retarded PA6 were measured. Fourier transform IR and SEM techniques were used to analyze the pyrolysis residue and cone calorimeter was applied to determine a number of combustion parameters closely related to fire safety, including the peak heat release rate, average heat release rate, total heat rate, effective combustion heat and mass loss rate, specific extinction area etc., all of them are decreased clearly besides the specific extinction area. In addition, the elemental composition of the pyrolysis residue on the PA6 surface and the corresponding XPS data were obtained using XPS technique. Experimental results have shown that the limiting oxygen index and UL 94V flame retardancy of PA6 flame-retarded with 27%(mass fraction) of MPP-MOM reach 35.3% and V-0 grade, respectively. Simultaneously, it has also been shown that the synergistic flame retardancy of MOM to MPP is very good.