单组份聚脲涂层耐热空气老化性能研究OA

The summer temperature in Xinjiang is generally high,especially in Turpan and Hami areas,where the maximum temperature can exceed 40℃.The temperature in Turpan has even witnessed to 50℃.The surface protective coating materials for ordinary polymer-based hydraulic concrete are prone to stress cracks in the summer high-temperature environment due to the difference in thermal expansion coefficients with the hydraulic concrete.Moreover,repeated thermal cycles accelerate the fatigue failure of the coating.In this paper,a monocomponent polyurea material with good comprehensive performance is selected,and indoor thermal air accelerated aging simulation tests are designed,to study the tensile properties and bonding performance of the polyurea coating with concrete,and the changes in the microscopic morphology and internal structure of the coating are also analyzed through methods such as SEM and IR.It is found that during the heat air aging process,no significant chemical bond breakage occurs on the surface of the coating,indicating the failure mode of the monocomponent polyurea coating is mainly physical failure.