金属氧化物对膨胀阻燃涂层耐火及成炭性能的影响

金属氧化物(MO)可显著影响膨胀阻燃体系的热解成炭过程, 进而改善膨胀阻燃涂层的耐火性能。将Fe₂O₃、ZnO、TiO₂分别添加到双环笼状磷酸酯膨胀阻燃环氧涂层中, 研究了MO对涂层耐火及成炭性能的影响规律。燃烧背温测试结果表明, MO可产生显著的协效耐火作用, 三种MO对耐火性能的增效能力为Fe₂O₃>ZnO>TiO₂。热失重(TGA), 激光拉曼光谱(LRS)和X射线光电子能谱(XPS)分析表明, MO促进了残炭的耐高温氧化性能及类石墨化程度的提高, 增加了涂层的高温残炭量, 三种MO提升涂层成炭性能的能力为Fe₂O₃>ZnO>TiO₂。

Effect of Metal Oxides on Fire Resistance and Char Formation of Intumescent Flame Retardant Coating

Metal oxides (MO) can remarkably affect the char formation of intumescent flame retardants (IFR) during thermal decomposition, thereby improving the fire resistance property of IFR coatings. In present work, Fe₂O₃, ZnO and TiO₂ were separately incorporated with caged bicyclic phosphates based IFR in epoxy coating, and their effects on fire resistance and char formation of the IFR coating were investigated. Back temperature test results showed that MO worked synergistically on improving fire resistance of the coating and their effectiveness of improvement followed the trend of Fe₂O₃>ZnO>TiO₂. Thermogravimetric analysis (TGA), laser Raman spectroscopy (LRS) and X-ray photoelectron spectroscopy (XPS) results revealed that MO promoted the formation of pseudo-graphic char with improved thermal stability which still survived at high temperature, and their effectiveness of promotion also followed the trend of Fe₂O₃>ZnO>TiO₂.