为提高建筑物表层的抗蚀性,将经三甲基氯硅烷(TMCS)改性过的疏水性 SiO2气凝胶粉体溶于丙酮溶剂中,制成表面防护涂层。研究了不同温度对气凝胶疏水性能的影响,以及超疏水性气凝胶粉体涂层制备条件、涂刷于混凝土表层时对水的耐久性能；利用红外光谱和扫描电镜对其化学基团和微观形貌进行分析。实验结果表明,250℃以下时,气凝胶为超疏水性,之后随温度升高大幅度下降直到完全消失；涂刷次数与气凝胶在分散体系中的质量有关；冲刷时,涂层先由超疏水性变为疏水性,之后长时间保持不变,水浸泡不改变涂层的超疏水性。
A superhydrophobic aerogel powder coating was developed to improve the corrosion resistance of building surface,which involved modifying hydrophobic SiO2 aerogel powder by trimethylchlorosilane (TMCS) then dissolved in acetone.The effects of temperatures on aerogel hydrophobicity,the preparation conditions of the coating,and the durability resistance of water in brushing were studied.Chemical groups and micro mor-phology were analyzed by infrared spectroscopy and scanning electron microscope respectively.Experiment re-sults show that the aerogel is superhydrophobic under 250 ℃,while the hydrophobicity will decline significantly with temperature increasing.Brushing times are related to the mass of aerogel in the dispersion system.The coating changes from superhydrophobicty to hydrophobicity in brushing process,then remain unchanged after a long period of brushing,water immersion doesn't change the superhydrophobicty.
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