应用无溶剂环氧封闭涂料和聚脲涂料在混凝土试样表面制备聚脲涂层体系，测试了该涂层体系在混凝土表面的附着强度，利用表面形貌分析及红外光谱和电子能谱等技术手段，分析混凝土与聚脲涂层界面特性，探讨聚脲涂层在混凝土表面附着失效的机理。结果表明，聚脲涂层与混凝土的附着失效为涂层与混凝土之间的物理附着破坏；而“无溶剂环氧封闭涂层+聚脲涂层”体系的失效为封闭涂层与混凝土之间的物理附着破坏和封闭涂层本身的内聚破坏；封闭涂层的应用可提高混凝土表面的强度，无溶剂环氧封闭涂层和聚脲涂层之间可以形成互穿网络结构。
The composite polyurea coating system were made with the solvent-free epoxy sealing coating and the polyurea coating on the surface of the concrete sample. The adhesion strength of the polyurea coating on the surface of concrete was measured. To understand the reasons for the adhesion failure of the polyurea coating on the surface of the concrete sample, the characteristics of the interface between the polyurea coating and the concrete surface were analyzed thoroughly with the help of surface topography, infra-red spectrum, and electron spectrum. The results showed that the adhesion failure resulted from the damage of the physical adhesion between the polyurea coating and concrete; and the failure of “solvent-free epoxy sealing coating + polyurea coating” system resulted from both the damage of the physical adhesion between the coating and concrete, and the damage of cohesion of the sealing coating itself. It was suggested that this solvent-free epoxy sealing coating improved the adhesion of the coating system and enhanced the strength of the concrete surface because of the special internal structure formed between the solvent-free epoxy sealing coating and the polyurea coating.
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