【摘要】 通过向环氧树脂（EP）中添加聚磷酸铵（APP）、三聚氰胺（MEL）以及一种新型有机硅阻燃剂苯基硅树脂（HBPSi），制备了环氧膨胀型防火涂层。基于锥形量热仪燃烧实验，通过实时测量涂层内外部和钢质基体内部的温度变化，研究了涂层和钢质基体的传热过程。结果表明：HBPSi添加质量分数0.7%时，隔热效果最佳；涂层和钢质基体厚度越厚，隔热效果越好，钢板厚度10 mm、涂层厚度4 mm时，最高热释放速率（pHRR）仅为182.82 kW·m^-2；表面光滑的钢质基体传递的热量较少，表面抛光0.2的16MnDR的pHRR为325.41 kW·m^-2；钢质基体材质和热辐射功率对传热过程也有显著影响。更多还原

【Abstract】 The thermal insulation effect of intumescent fire retardant coating on the surface of steel structure is of great significance for steel structure building to avoid high temperature disaster. In this paper, epoxy intumescent fire retardant coating was prepared by adding ammonium polyphosphate（APP）, melamine（MEL） and a new organosilicone flame retardant phenyl silicone resin（HBPSi） to epoxy resin（EP）. Based on conical calorimeter combustion experiments, the heat transfer process of coating and steel substrate was studied by measuring the temperature changes inside and outside the coating and steel substrate in real time. The results show that when the HBPSi content is 0. 7%, the thermal insulation effect is the best. The thicker the coating and the steel substrate, the better the heat insulation effect. When the steel plate thickness is 10 mm and the coating thickness is 4 mm, the peak heat release rate（pHRR） is only 182. 82 kW · m^-2. Smooth steel substrates transfer less heat. The pHRR of 16 MnDR with polished 0. 2 is 325. 41 kW · m^-2. Steel substrate material and thermal radiation power also have significant influence on the heat transfer process.更多还原