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复合阻燃剂中各组分的复合协同作用是提高阻燃效率的有效途径。以介孔二氧化硅(SiO2)为载体,通过纳米浇铸法引入聚磷酸铵(APP),制备了介孔SiO2-APP复合阻燃剂,采用CONE法研究了该复合阻燃剂处理杨木粉的燃烧性能和发烟性能。结果表明:介孔SiO2-APP复合阻燃剂能有效降低杨木粉的热释放速率(HRR)、总热释放量(THR)、烟生成速率(SPR)和总烟释放量(TSP),催化木材形成炭层,表现出显著的阻燃和抑烟特性。高温下聚磷酸铵催化木材转化为炭,SiO2增加炭层的热稳定性,形成Si-O-C键和Si-C键的保护炭层,介孔SiO2对烟气的高效吸附和催化转化作用,可能是介孔SiO2-APP复合阻燃剂高效阻燃抑烟的根本原因。
The synergistic effect of each component in the composite flame retardant is an effective way to improve the flame retardant efficiency. Using mesoporous silica (SiO2) as carrier, nano-casting method was introduced into ammonium polyphosphate (APP) to prepare mesoporous SiO2-APP composite flame retardant. CONE method was used to study the effect of the composite flame retardant on poplar wood powder The burning and smoking performance. The results showed that the mesoporous SiO2-APP composite flame retardant can effectively reduce the heat release rate (HRR), total heat release (THR), smoke generation rate (SPR) and total smoke release (TSP) Wood forms charcoal layers that exhibit significant flame and smoke suppression properties. At high temperature, ammonium polyphosphate catalyzes the conversion of wood to carbon. SiO2 increases the thermal stability of the carbon layer and forms a protective carbon layer with Si-OC bonds and Si-C bonds. Mesoporous SiO2 can efficiently adsorb and catalyze the conversion of flue gas. Mesoporous SiO2-APP composite flame retardant is the fundamental cause of efficient flame retardant.