目的 研究微胶囊红磷(MRP)和纳米氢氧化镁(Nano–MH)协同阻燃木塑复合材料(WPC)的阻燃效果及阻燃机理。方法 以MRP为主阻燃剂，Nano–MH为协效阻燃剂，低密度聚乙烯(LDPE)、线型低密度聚乙烯(LLDPE)和木粉为基础物质，采用二次造粒和注射成型法制备阻燃木塑材料(WPC/MRP/MH)。通过燃烧等级测定、极限氧指数(LOI)测定和热重谱图(TG)分析阻燃剂对复合材料阻燃性的影响，利用Flynne–Walle–Ozawa(FWO)方法研究WPC和WPC/MRP/MH的热分解行为，并采用Criado方法推断WPC/MRP/MH的反应机理。结果 复合材料MRP质量分数为12.5%时阻燃等级达到UL94 V–0级，LOI值高达28.3%;WPC/MRP/MH的tonset、tendset和tp均高于WPC，且在热分解后期FWO方法得到的表观活化能(Ea)逐渐增加，材料热稳定性明显提高;WPC/MRP/MH的反应机理函数为g(α)=[−ln(1−α)]^1/n、f(α)=n(1−α)[−ln(1−α)]^1/n，热分解机理为成核后增长。结论 MRP和Nano–MH复配有效提高了WPC的热稳定性，复合材料的阻燃性能得到显著提高。

The work aims to study the flame retardant effect and flame retardant mechanism of microencapsulated red phosphorus (MRP) and nanometer magnesium hydroxide (Nano-MH) flame retardant wood-plastic composite (WPC). MRP was used as the main flame retardant. Nano-MH was used as a synergistic flame retardant. Low density polyethylene (LDPE), linear low density polyethylene (LLDPE) and wood flour were used as the basic materials to prepare flame-retardant wood-plastic materials (WPC/MRP/MH). The effects of flame retardants on the flame retardancy of composites were analyzed by determination of combustion grade, limiting oxygen index (LOI) and thermogravimetry (TG). The thermal decomposition behavior of WPC and WPC/MRP/MH was studied through the Flynne-Walle-Ozawa (FWO) method. The reaction mechanism of WPC/MRP/MH was deduced by the Criado method. It was showed when the MRP mass fraction of the composite was 12.5%, the flame retardant grade reached UL94 V-0, the LOI value was up to 28.3%; the Tonset, Tendset and Tp of WPC/MRP/MH were higher than those of WPC, and the apparent activation energy (Ea) obtained by FWO method gradually increased in the later stage of thermal decomposition, and the thermal stability of the material was significantly improved; The reaction mechanism function of WPC was g(α)=[−ln(1−α)]1/n, f(α)=n(1−α)[−ln(1−α)]1/n. The thermal decomposition mechanism was growth after nucleation. The compounding of MRP and Nano-MH effectively improves the thermal stability of WPC. The flame retardant properties of the composites are significantly improved.