Study On The Preparation And Properties Of Titania Self-cleaning Glass By Sol-gel Method

Titanium thin film exhibits hydrophilicity and photocatalytic activity that can be wildly utilized in many fields such as air decontaminate,head lamp,dope and so on. But in our country the research and development of it is behindhand. The present industrialization production has some disadvantages such as high cost of money. The paper use diethanolamine as the chelator instead of acetylacetone, prepare titanium thin film by sol-gel method. This can save the experimental cost.Tetraethyl orthosilicate and Titanium butoxide are used as prodromal hydrolytic substance, the experiments has prepared the silicon sol and titanium sol by mensurating the Tyndall effect of different liquid. The installation has also designed the liquid level falling method coating equipment by ourselves. This equipment can adjust the velocity of flow and prepare the film symmetrically.In the experiment, some parameters are confirmed which are based on the purpose of improving the photocatalytic activity. The parameters are: the number of TiO₂ deposition on glass is 3;the lifting velocity of glass is 1.5mm/s;the calcination temperature for TiO₂ glass is 500℃.A layer of SiO₂ thin film is coated on the silde glass plate before coating TiO₂ film for preventing sodium ions in the glass to diffuse in the TiO₂ film to improve the hydrophilicity. The photocatalystic degradation efficienty can enhance from 16.2% to 18.7% in 20 mins irradiation, and the contact angle of film surface can reduce from 42°to 18°after 40 mins irradiation.Effect of UV irradiating time on hydrophilicity and photocatalytic activity is alsomensurated. The photocatalystic degradation efficienty can enhance to 28.2% and the contact angle of film surface can fall to 5°after 120 min.The paper text the decontamination capability for sewerage, prevent dust and antifogging of the film. Validate the glass has well self-cleaning capability.The film that the experiment prepared has well adhesive power and long constancy. It can be deposited on various of materials, and it provides broad space for the actual application of TiO₂.