Wood is a widely used as a construction material; however, its inflammability limits its applications in the field of construction. Moreover, high loadings of flame retardants typically required for wood impregnation in fire safety treatments cause increased hygroscopicity and non-durable flame retardance. In this study, melamine (MEL) was impregnated in the porous structure of the wood, in combination with an organic phosphoric acid (AP). Flammability characterization in terms of limiting oxygen index (LOI) and cone calorimetry tests revealed significant improvement in fire resistance of the samples due to the presence of MEL/AP in the porous structure of the wood, synthesized in situ in the wood channel with 2 wt% MEL and 25 wt% AP solutions using a two-step method. The LOI value increased from 21.0% to 68.5%, and the peak-heat-release rate and total-heat-release reduced by 41.7% and 80.2%, respectively, compared with that of the control sample. The MEL/AP synthesized in the porous wood structure improved flame retardancy, durability, and hygroscopicity. The proximity of the ammonia gas-release and wood decomposition temperatures along with the effectively formed cohesive protective and bubble-shaped-char layer enhanced the flame-retardant properties.

木材被广泛用作建筑材料。但是，其易燃性限制了其在建筑领域的应用。此外，在防火安全处理中通常需要木材浸渍的高含量阻燃剂会导致吸湿性增加和阻燃性提高。在这项研究中，三聚氰胺（MEL）与有机磷酸（AP）一起浸渍在木材的多孔结构中。在极限氧指数（LOI）和锥形量热法测试方面的可燃性表征表明，由于木材的多孔结构中MEL / AP的存在（在木材通道中原位合成2 wt％），样品的耐火性有了显着提高MEL和25 wt％的AP溶液采用两步法。LOI值从21.0％增加到68.5％，与对照样品相比，峰值放热率和总放热率分别降低了41.7％和80.2％。在多孔木结构中合成的MEL / AP改善了阻燃性，耐用性和吸湿性。氨气释放和木材分解温度的接近以及有效形成的内聚保护性和气泡状炭层提高了阻燃性。