摘要： 简单、经济、规模化制备二氧化钛（TiO₂）光致超亲水表面备受重视。本研究利用硅氧烷溶胶为介质,将TiO₂纳米颗粒浸涂到玻璃表面。考查了颗粒在表面的分散状况和TiO₂含量对涂层光致超亲水性能、透明性以及涂层牢固度和表面硬度的影响。结果发现:浸涂并经紫外辐照1h或120℃烘干3h后,TiO₂纳米颗粒能均匀、牢固地负载到玻璃表面;10min UV辐照后,表面变得超亲水;涂层附着力达0级,表面硬度达到5H。硅氧烷溶胶对玻璃表面的良好浸润性和对含羟基纳米颗粒的良好"粘结"性能是纳米颗粒在玻璃表面能均匀、牢固负载的主要原因。研究结果为大规模、低成本制备透明自清洁表面提供了理论和实验基础。

关键词: 二氧化钛, 3-(甲基丙烯酰氧)丙基三甲氧基硅烷(KH570), 溶胶-凝胶, 超亲水

Abstract: Simple and economical methods for scale production of TiO₂ photo-induced superhydrophilic surface have always been pursued in recent years. In this study, TiO₂ nanoparticles were coated by dipping process onto the glass surface by using prepolymer of 3-methacryloxy-propyl-trimethoxysilane(KH570)hydrolysate as binder. The distribution and dispersion of TiO₂ nanoparticles on glass substrate, and the influence of TiO₂ level on wettability after light irradiation, transparency, the fastness and hardness of TiO₂ coating on glass substrate were investigated systematically. The results showed that after UV irradiation for 1 h or drying at 120 ℃ for 3 h, TiO₂ particles were homogeneously and firmly conglutinated on the glass substrate at nano scale and bare state. The surface became superhydrophilic after UV irradiation for 10 mins. The fastness and hardness of the coats reached grade 0 and 5H respectively. The good wettability on glass surface and the high conglutination property to TiO₂ nanoparticles of silane hydrolysate should be responsible for formation of such firm nano-TiO₂ thin layer. This study would provide theoretical and practical basic for manufacturing self-cleaning TiO₂ photo-induced superhydrophilic surface by a cost -effective and large-scale process

Key words: titanium dioxide(TiO₂ ) , 3-methacryloxy-propyl-trimethoxysilane(KH570), solgel, superhydrophilicity