The change of mechanical properties, glossiness and molecular structure of pure polyurea heavy anti-corrosion coating(Qtech-412 coating) in marine atmosphere environment outdoor natural exposure aging and ultraviolet artificial accelerated aging were studied through FTIR,DSC and so oa The results show that the gloss of Qtech-412 coating decreased by 94. 53%, the mechanical properties remain basically unchanged after outdoor natural exposure aging for 600 d; the surface of coating lost light, organic dyes become black and mechanical properties changed little after ultraviolet artificial accelerated aging for 15000 h. FTIR and DSC test show that only the dye molecular bond of coating are fractured on the surface by the two aging ways, it appears fade or black phenomenon, but pure polyurea molecular structure is very stable; painted different anti-corrosion coatings on the steel plates, and exposed in synthetic seawater pool six months, the anticorrosive effect of pure polyurea is better than any other heavy-duty coatings. Now Qtech-412 coating has been applied to the protection engineering of Qingdao Bay Bridge pile cap structure successfully.%通过FTIR、DSC等方法,研究了在海洋大气环境户外自然曝晒老化和紫外线人工加速老化条件下,纯聚脲重防腐涂层(Qtech-412涂层)的力学性能、光泽度和分子结构变化.结果表明:Qtech-412涂层经过600 d户外自然曝晒老化后,光泽度下降94.53％,力学性能基本不变；经过15000 h紫外线人工加速老化后,涂层表面失光,有机染料变黑,力学性能变化较小；FTIR和DSC试验表明上述两种老化方式都仅仅使涂层表面染料分子的化学键断裂,出现褪色或变黑现象,内部分子结构非常稳定；在人造海水的露天水池中曝晒6个月后的划叉破坏试验表明,Qtech-412涂层实际防腐效果优于其它重防腐涂层.目前Qtech-412涂层已成功应用于青岛海湾大桥承台结构防护工程.
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