水性聚氨酯丙烯酸酯/氧化石墨烯防腐涂层的制备与性能

Preparation and Properties of Waterborne Polyurethane Acrylate/Graphene Oxide Anti-Corrosion Coating

为进一步改善水性聚氨酯丙烯酸酯涂层的防腐性能,采用原位聚合法制备了系列水性聚氨酯丙烯酸酯/氧化石墨烯(WPUA/GO)复合乳液。利用X射线衍射、拉曼光谱、红外光谱表征了自制GO的结构与形貌;运用透射电镜、扫描电子显微镜分析了复合乳液的微观形貌;并通过耐盐雾试验及电化学工作站测试了涂层的防腐性能。结果表明,通过改进的Hummers法制备出氧化程度高、分散性较好的GO;WPUA/GO乳液粒径随着GO含量的增加呈现先增大后减小的趋势;当GO的质量分数为0.5%时,涂层的热稳定性提高了140℃,耐盐雾时间比纯WPUA延长了10 d,腐蚀电流密度减小了1个数量级。

To improve the corrosion resistance of waterborne polyurethane-acrylate coating,a series of water-polyurethane-acrylate / graphene oxide（ WPUA / GO） hybrid emulsions were prepared through in-situ polymerization. X-ray diffraction,Raman spectroscopy,and infrared spectroscopy were utilized to characterize the structure and morphology of graphene oxide. The microstructure of WPUA / GO hybrid emulsion was observed by transmission electron microscopy,and scanning electron microscopy. The anti-corrosion properties of the WPUA / GO were determined by salt spray machine and electrochemical workstation. The results show that： graphene oxide with higher degree of oxidation and better dispersity was obtained through modified Hummers method. The particle size of WPUA / GO emulsion firstly increases and then decreases with increasing GO content. When the GO content is 0. 5%,the thermal stability of the films increases by 140 ℃,the salt fog spray process time is increased by 10 d compared with that of pure WPUA,and the corrosion current density is reduced by an order of magnitude.