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通过氧指数(LOI)、力学性能、泡孔结构及热重分析(TG),探究了纳米碳酸钙/IFR复合阻燃体系对PP发泡材料性能的影响和机理。结果表明:Nano-Ca CO_3与IFR存在协效作用,能有效改善PP复合泡沫材料的阻燃性能,使氧指数显著提升;Nano-Ca CO_3的添加能提升阻燃PP发泡材料的力学性能,并且添加量存在最优值。另外通过扫描电镜发现:Nano-Ca CO_3的添加可以提高IFR与PP的相容性,使阻燃PP复合发泡材料的泡孔结构更规整,泡孔孔径减小,孔密度增大。TG结果表明:Nano-Ca CO_3能提高阻燃PP复合发泡材料的热稳定性,形成更致密的炭层,提升了热失重率。随着Nano-Ca CO_3添加量的增大,PP/IFR/Nano-Ca CO_3复合发泡材料的氧指数、力学性能和热稳定性都呈现先增大后减小的趋势,因此当PP/IFR/Nano-Ca CO_3质量比为80:20:2时,复合发泡材料综合性能较优。
The effects and mechanisms of nanometer CaCO3 / IFR composite flame retardant system on the properties of PP foams were investigated by the oxygen index (LOI), mechanical properties, cell structure and thermogravimetric analysis (TG). The results showed that Nano-Ca CO 3 synergistically interacted with IFR, which could effectively improve the flame retardancy of PP composite foam and increase the oxygen index significantly. The addition of Nano-Ca CO 3 could improve the mechanical properties of flame- And the amount of addition exists optimal value. In addition, it was found by scanning electron microscopy that the addition of Nano-Ca CO 3 could improve the compatibility of IFR with PP, make the cell structure of flame retardant PP composite foam more regular, decrease the cell diameter and increase the cell density. TG results show that: Nano-Ca CO_3 can improve the thermal stability of flame-retardant PP composite foam material to form a denser carbon layer, enhance the rate of weight loss. The oxygen index, mechanical properties and thermal stability of PP / IFR / Nano-Ca CO_3 composite foam firstly increased and then decreased with the increase of the amount of Nano-Ca CO 3. Therefore, when PP / IFR / / Nano-Ca CO_3 mass ratio of 80: 20: 2, the composite foam material has better overall performance.