Study On The Preparation And Properties Of PDMS/SiO₂ Hybrid Membrane

In this paper, using sol-gel process, H2O, TEOS, PDMS and EtOH are taken as the main materials to make PDMS/SiO2 organic-inorganic hybrid membrane. The process method and process parameters are confirmed. Finally, a smooth, uniform, transparent, integrated performance membrane is prepared.In the aspects of Sol-configuration, the manner and order of each component's addition are explored, the necessity of the application of water bath heating method is found,and this method is used in the later period.The best ratio of each component for the Sol of PDMS/SiO2 is confirmed. Vol: TEOS/PDMS EtOH=/H2O/1-0.1～0.2:0.5:1, PH=3. The dip and spin coating homemade equipment are prepared, the effects of two kinds of coating method are tested.When the volume ratio of PDMS and TEOS is more than 20%, the film in good condition can not be prepared by conventional method. To improve the technology, by adding an excess of ethanol in the sol preparation period, and adjusting the viscosity by water bath evaporation method. The sol with good film forming properties and volume ratio of 30% are prepared.When the sintering temperature of the first layer is below 400℃, the second layer can not be coated; When the sintering temperature of the first layer is higher than 400℃, the second layer can be very good.When the sintering temperature of the film is below 400℃, Hydrophobic film will be got, the contact angle is between 90°～100°; When the sintering temperature of the film is higher than 400℃,the film will not have the hydrophobic properties.When the sintering temperature of the film is higher than 400℃, excellent corrosion protective effect can be got by Single-layer coating; When the sintering temperature of the film is below 400℃, corrosion protection effect will be significantly lower. The corrosion protection properties of single layer film will be affected by the property of Substrate surface greatly.