摘要:
将无卤膨胀阻燃剂六(4-DOPO羟甲基苯氧基)环三磷腈(DOPOMPC)、聚磷酸铵(APP)及多壁碳纳米管(MWCNTs)复配后加入环氧树脂(EP)中, 制备出新型阻燃复合材料DOPOMPC-APP-MWCNTs/EP。通过极限氧指数(LOI)、水平垂直燃烧和锥形量热法研究其阻燃性能。研究结果表明: MWCNTs的加入增强了膨胀阻燃体系的阻燃性能和力学性能, 并在一定程度上改善了体系燃烧时的浓烟现象。当阻燃体系总质量分数为20%, MWCNTs质量分数为2%时, 材料性能最优, 其LOI达到36.8%, 热释放速率峰值、有效燃烧热平均值、比消光面积平均值和CO释放率平均值与未阻燃EP相比分别下降了83.5%、31.5%、47.6%、50.0%, 与DOPOMPC-APP/EP相比下降了83.5%、77.7%、83.7%、68.9%。SEM分析表明: 添加MWCNTs后, 燃烧炭层呈现出大面积交联网络状结构。
Abstract:
Epoxy resin (EP) was flame retarded with halogen-free intumescent flame retardant six-(4-DOPO hydroxymethyl phenoxy) cyclotriphosphazene (DOPOMPC), polyphosphate (APP) and multi-walled carbon nanotubes (MWCNTs) to prepare new flame retardant composites DOPOMPC-APP-MWCNTs/EP. The flame retardant property of the composites was analyzed by limit oxygen index (LOI), horizontal vertical combustion, and cone calorimetry. The result demonstrates that the addition of MWCNTs increases the flame retardant property and mechanical property of intumescent flame retardant system, and improves the dense smoke phenomenon to a certain extent when system is burning. When the total mass fraction of flame retardant system is 20% and the mass fraction of MWCNTs is 2%, optimal properties of materials can be obtained. The LOI of the composites is 36.8%, the peak heat release rate, average effective heat of combustion, average specific extinction area, average CO release rate are respectively reduced by 83.5%, 31.5%, 47.6%, 50.0% compared with the non-flame retardant EP, and reduced by 83.5%, 77.7%, 83.7%, 68.9% compared with DOPOMPC-APP/EP. SEM analysis reveal that a dense, cross-linked network charred layer is formed in DOPOMPC-APP-MWCNTs/EP after the addition of MWCNTs.
百度学术
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