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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 polyurea coating system was prepared on the surface of concrete by solventless epoxy coating and polyurea coating. The adhesion strength of the coating system on concrete surface was tested. The surface morphology, infrared spectrum and electron spectroscopy Means to analyze the interface characteristics between concrete and polyurea coating and discuss the mechanism of polyurea coating failure on concrete surface. The results show that the failure of the attachment of polyurea coating to concrete is the physical adhesion between the coating and the concrete. The failure of the “solvent-free epoxy coating + polyurea coating” system is the failure of the coating and the concrete And the cohesive failure of the closed coating itself. The application of the closed coating can improve the strength of the concrete surface, and the interpenetrating network structure can be formed between the solventless epoxy coating and the polyurea coating.