Preparation And Propoties Of Superhydrophobic Hybrid Coatings Based On Silica

In this paper, based on the principle of "Lotus effect", three kinds of organic-inorganic superhydrophobic hybrid sufaces were prepared on the basis of silica. The main research contents are as follows:1. Hydrophobic nano-silica particles were mixed with polylactic acid (PLA) solutions, and then the PLA/SiO2hybrid films were prepared on glass and the water contact angle (WCA) reached as high as165±1.7°together with a contact angle hysteresis of lower than3°. The resultant films can be applied as a coating of biodegradable materials for self-cleaning and waterproof without any negative influence on the biodegradability of the materials.2. Using methyltriethoxysilane (MTES) as precursor, the organically modified silica (ORMOSIL) gels were obtained by acid-base catalysis mechanisms, and then superhydrophobic ORMOSIL hybrid coatings were fabricated on glass at room temperature by simple dip coating technique, and the WCA can reach162＋1.2°.3. An organic-inorganic superhydrophobic hybrid coating (WCA=152±0.7°) was prepared by sol-gel method with tetraethoxysilane (TEOS) and MTES as precursors and water based silicone acrylate emulsion (KD-26) as film-forming materials.The hydrophobicity, chemical composition, morphology and other properties of the resulting hybrid coatings were investigated by WCA, fourier transform infrared spectrum (FT-IR), energy dispersive spectrometer (EDS), scanning electron microscopy (SEM) and so on. In this paper, three kinds of superhydrophobic hybrid coatings were compared in terms of preparation time, hydrophobicity, solvent toxicity, transparent, etc. The conclusion shows that the superhydrophobic ORMOSIL coating has obvious advantages in the aspects mentioned above, together with promising applications in agriculture and industry.