氢氧化镁在膨胀阻燃聚丙烯体系中的协效作用研究

Study on Synergistic Effect of Magnesium Hydroxide in Intumescent Flame Retardant Polypropylene Composites

以膨胀型阻燃剂(IFR)作为聚丙烯(PP)的主要阻燃剂制备了IFR/PP(20/100)阻燃体系,在此基础上,将氢氧化镁(MH)和IFR进行复配,利用氧指数、力学性能测试、热重分析、锥形量热等方法考察了MH在IFR阻燃PP中的阻燃增效作用。研究结果表明:IFR/MH/PP质量比为18:2:80时,材料能够较好地保持力学性能且氧指数最大可达31.6%;IFR/MH/PP比IFR/PP体系在热释放、烟气、CO和CO_2排放指标上数值更低,热稳定性增加,成炭率更高,材料更难点燃,火灾性能指数(FPI)提高,阻燃性能优异,火灾蔓延指数(FGI)减小,火灾危险性降低。

Using intumescent flame retardant（IFR） as the flame retardant, IFR/PP（20/100） composites were prepared. On this basis, the magnesium hydroxide（MH） and IFR were mixed to get IFR/MH/PP composites. The synergistic effect of MH in the intumescent flame retardant PP composites was studied by means of limiting oxygen index, mechanical property testing, thermogravimetric analysis and cone calorimetry method. The results show that： IFR/MH/PP composite with a mass ratio of 18/2/80 maintains the superior mechanical properties and has the highest LOI value of 31.6%. The composite of IFR/MH/PP exhibits better flame retardancy and smoke suppression than those of IFR/PP and PP. Compared with IFR/PP system, the IFR/MH/PP composite has lower emission index of heat, smoke gas, CO and CO2, better thermal stability, higher charring ability, and it is more difficult to ignite, the fire performance index（FPI） increases, the flame retardant performance is excellent. The fire spread index（FGI） decreases, and the fire risk is reduced.