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采用溶胶-凝胶法,制备不同含量PDMS、Nano-SiO2改性的SiO2基有机-无机复合溶胶,涂覆于混凝土基底上。通过红外光谱(IR)、疏水角(CA)、扫面电镜(SEM)等测试研究不同含量的PDMS、Nano-SiO2对复合涂层疏水性能的影响。结果表明,PDMS和TEOS以化学键Si-O-Si的形式相互结合;复合涂层的疏水性能随着PDMS含量的增加而增加,文中疏水角最大提高了23°(PDMS为50%时);加入Nano-SiO2改性涂层的疏水性能只有在Nano-SiO2加入量较高时,才能有较为明显的差别,文中疏水角最大提高了26°(Nano-SiO2为8%时)。
Sol-gel method was used to prepare SiO2-based organic-inorganic composite sol with different content of PDMS and Nano-SiO2 and coated on the concrete substrate. The effects of different contents of PDMS and Nano-SiO2 on the hydrophobic properties of the composite coatings were investigated by infrared spectroscopy (IR), hydrophobic angle (CA) and scanning electron microscopy (SEM). The results show that PDMS and TEOS are bound to each other in the form of Si-O-Si chemical bonds. The hydrophobicity of the composite coating increases with the increase of PDMS content. The maximum hydrophobic angle increases by 23 ° (PDMS is 50%), The hydrophobic property of Nano-SiO2 modified coating can only be obviously changed when the content of Nano-SiO2 is higher. The maximum hydrophobic angle is 26 ° (Nano-SiO2 is 8%).