氧化石墨烯提高钢结构水性膨胀防火涂料的防火性能研究

以水性丙烯酸树脂为基体,聚磷酸胺、季戊四醇和三聚氰胺为膨胀阻燃体系,加入少量氧化石墨烯制备水性膨胀防火涂料。采用小板燃烧法研究了氧化石墨烯用量对膨胀型防火涂料的阻燃性能的影响。结果表明:加入极少量氧化石墨烯(<0.01%),可提高涂料的阻燃性,当氧化石墨烯含量在0.005%时,涂层的耐燃时间可达432 s,炭层膨胀高度较未加氧化石墨烯涂层增加了13.04%。结合红外光谱(FT-IR)、X射线衍射(XRD)和扫描电子显微镜(SEM)等表征手段对炭层形貌进行分析可知,加入氧化石墨烯后炭层在300~500 ℃范围的热稳定性提高,燃烧炭层完整密实,隔热性能提高,耐燃时间提高。

Improvement of Flame Retardancy of Graphene Oxide Modified Waterborne Intumescent Fire Resistant Coatings for Steel Structure

Waterborne intumescent fire resistant coatings were prepared using waterbrone acrylate as matrix, ammonium polyphosphate, pentaerythritol and melamine as intumescent system and different concentrations of graphene oxide (GO) as synergistic additives. The effects of the GO concentration on the fire retardant properties of the coatings were investigated by small plate burning method measurements. The results showed that trace amount of GO could markedly increase the fire retardant properties of the coatings. When the GO concentration was 0.005wt%, the fire-resistant time of the coatings reached 432 s. Expandable char layer height is increased by 13.04% as compared with that coating without graphene oxide. The structure and morphology of the char layers were characterized by means of infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the thermal stability of the coating between 300 ℃ and 500 ℃ was increased when GO was added. Besides, the char layers were stronger and better protected, which could provide improved heat insulation and flame resistance.