Abstract: The surface of fly ash was modified by the silane coupling agent and the fly ash/epoxy resincompositecoatings were prepared through mixing method. The surface composition and microstructure of modified fly ash were characterized by FT-IR and SEM. The fire-resistant properties of the fire-resistant coatings modified by fly ash were tested. The influence of the content of fly ash on fire-resistant property was discussed, and the extinguishing mechanism of the fire-resistant coating modified by fly ash was also investigated. The results showed that the surface of fly ash was grafted with functional groups derived from silane coupling agent and thus enabled a good compatibilitywith epoxy resin. With the increase of fly ash, the fire-resistant property of the composite coatings increased firstly and then decreased. Specifically,the fire-resistant property was optimized when the content of fly ash was 5wt %.

Key words: fly ash, epoxy coatings, surface modification, fire-resistant property

摘要： 采用硅烷偶联剂对粉煤灰进行表面改性，通过混合法制备了粉煤灰/环氧树脂防火涂料。利用傅里叶红外光谱仪（FT-IR）、扫描电镜（SEM）对改性粉煤灰的表面成分、微观形貌进行了分析；利用燃烧法观察涂料的防火性能，研究了粉煤灰添加量对防火性能的影响，探讨了该涂料的防火机理。 结果表明：改性后粉煤灰表面出现硅烷偶联剂的特征官能团，表面接枝现象明显，与环氧树脂相容性较好。 随着改性粉煤灰添加量的增加，防火性能呈先增后减的趋势，在改性粉煤灰添加量为 5%时，其防火性能达到最佳。

关键词: 粉煤灰, 环氧涂料, 表面改性, 防火性能