Search

The micro nano rough surface of cement-based materials was constructed by the combination of modified copper mesh lithography and SiO, and the surface was modified by octadecyl a mine grafted humic acid as a low surface energy material to prepare a highly stable superhydrophobic cement-based material coating. The effects of different concentrations of Si()< in the coating and the re-etching of modified copper mesh on its hydrophobic properties were studied, and the optimum concentration of Si()< was deter mined. Tn addition, the surface morphology, structure and bonding of cement-based materials were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and Fourier infrared spectroscopy (FT-TR). At the same time, the water absorption and coating stability of superhydrophobic cement-based materials were comprehensively evaluated. The results show that when the concentration of SiO, is 2.5%, the surface contact angle of cement-based materials re-engraved with modified copper mesh treated by impregnation method reaches the peak value of 158. 6° and the rolling angle is as low as 5.5【The water absorption decreases by 73.5%. After that, after repeated 3() times of tape stripping surface test and knife scraping test, the coating still remains superhydrophobility (contact angle 150.2°, rolling angle 8.2°), which confirms that the coating surface treated by this method has superhydrophobility and good stability. [ABSTRACT FROM AUTHOR]