Preparation and properties of transparent superhydrophobic composite coatings of nano SiO2 composite particles/organosilicon oligomers
SiO2 composite particles solution was firstly prepared from physical blending of colloidal SiO2 particles solution,which was obtained via Stöber method,with powder SiO2 particles and then modified by 3-aminopropyl trimethoxysilane(KH540)and perfluoro-decyl trimethyloxysilane(PFDT).SiO2 composite particles/acidic organosilicon oligomer composite superhydrophobic coating was synthesized by spraying the modified SiO2 composite particles solution on glass substrate using acidic organosilicon oligomer prepared from polymerization of triethoxymethylsilane(MTES)and ethyl orthosilicate(TEOS)as bonding agent.The influence of SiO2 composite particles,acidic silicone oligomer,KH540 and PFDT on the composite coating were further investigated.The results showed that when the SiO2 composite particles solution consisting of colloidal SiO2 particles with a particle size of 110 nm and 50 nm powder SiO2 particles(The dosage was 1％of the mass of colloidal SiO2 particles solution),the mass ratio of SiO2 composite particles solution to acidic silicone diluent was 4:1,and the addition amount of both KH540 and PFDT was 1％of the total mass of mixed solution,the thus prepared composite coating could achieve light transmittance of 88％in the visible light wavelength range with a static contact angle of 155°,and maintain superhydrophobicity after 60 cm abrasion on 800 mesh sandpaper,with good self-cleaning property.
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