氧化石墨烯在水性防火防腐一体化涂料中的作用机理研究

Study on the Mechanism of Graphene Oxide in Waterborne Coatings with Fire Resistance and Anti-corrosion Integrated

将氧化石墨烯(GO)和不含卤素的磷-氮阻燃剂均匀地分散到水性环氧树脂体系中,利用凝聚相阻燃和气相阻燃混合阻燃技术制备了防火防腐一体化涂层,研究了氧化石墨烯对涂层的耐火性能、生烟速率以及耐腐蚀性能的影响,并结合微观形貌观察、热分析、腐蚀产物分析等研究了氧化石墨烯在防火防腐一体化涂层中的作用机理。结果表明:GO表面丰富的含氧官能团中羟基与环氧树脂侧链上的羧基间相互作用使得GO在水性环氧体系中具有优异的分散性;GO的加入能将耐火性能试验时间较纯试样提升73.0%,同时延长外界气体和腐蚀性介质的渗透路径,有效增强涂层抗渗透性,在增加涂层耐火性能和减少生烟速率的同时,提升了涂层耐腐蚀性能。

Graphene oxide(GO)and halogen-free phosphorus-nitrogen flame retardant were evenly dispersed into aqueous epoxy resin system,the fire resistance and anti-corrosion integrated coating was prepared by using the hybrid flame retardant technology of condensed and gas phase flame retardant.The effects of GO on the fire resistance test time,smoke generation rate and corrosion resistance of the coating were studied,and the mechanism of GO in the integrated fire protection and corrosion protection coating were studied by combining the microscopic morphology observation,thermal analysis and corrosion product analysis.The results showed that the interaction between hydroxyl groups in the rich oxygen-containing functional groups on the surface of GO and carboxyl groups on the side chain of epoxy resin led to excellent dispersion of GO in aqueous epoxy system;The addition of GO could increase the flame resistance time by 73.0%compared with the pure sample,and at the same time prolong the penetration path of external gas and corrosive medium,effectively enhance the permeability of the coating,while increasing the fire resistance test time of the coating and reducing the smoke rate,improve the corrosion resistance of the coating.