关键词: 溶胶-凝胶法, 二氧化硅纳米粒子, 杂化涂层, 超疏水, 静态接触角

Abstract:

First, with tetraethoxysilane (TEOS) as precursor and methyltriethoxysilane (MTES) as modifier, hydrophobic silica nano-particles were synthesized in polyacrylate emulsion containing siloxane and fluorine (FSiPA) by means of the sol-gel method. Next, superhydrophobic coatings were fabricated by spraying the SiO2/FSiPA hybrid emulsion on clean glass substrates. Then, the authors analyzed the effects of the FSiPA emulsion dosage and the mole ratio of MTES to TEOS (M/T) on the coating performance were analyzed and explored the effect of M/T on the coating micro-morphology was explored. Finally, the formation mechanism of the hybrid coating was discussed, and the self-cleaning properties of the superhydrophobic and hydrophobic coating tilting at the same angle were also compared. The results show that, when the FSiPA emulsion content iswas 15% and the M/T iswas 5, the coating possesses good film-forming property and self-cleaning property with a water contact angle of about 154.0°, and the hydrophobic silica particles can form rough micro/nanostructure on the coating surface.

Key words: sol-gel method, silica nanoparticle, hybrid coating, superhydrophobicity, static contact angle