Research On F-PEG/SiO₂ And TiO₂-F Composite Coatings

Surface functional materials are widely used in metal corrosion protection, oil water separation, self-cleaning, anti icing and anti-fogging due to their special wettability. At present,treatment of oily wastewater by traditional separation methods such as adsorption,coagulation, flotation and centrifugation, has the disadvantages of high energy consumption and two times of serious pollutions. In contrast, functional materials with hydrophilic and oleophobic surface can realize oil-water separation and self-cleaning function. Hence, it effectively solves the problem of pollution and being blocked by oil. So that, more and more researchers have paid attention to it.SiO₂/F-PEG and TiO₂-F/SiO₂/F-PEG （TiO₂-F: fluorocarbon surfactant FSN-100 modified TiO₂; F-PEG: fluorocarbon surfactant FSN-100 and polyethylene glycol PEG modified epoxy resin） organic inorganic composite coatings were prepared in this paper. The effects of curing time, curing temperature, PEG, FSN-100 mass fraction and inorganic particles on the contact angle were investigated through a serious of experiments. The composite coatinga were characterized through the contact angle tester （CA）, fourier transform infrared spectroscopy（FT-IR）, field emission scanning electron microscope （FE-SEM）, nuclear magnetic resonance（NMR）, thermogravimetric （TGA）, X ray diffraction （XRD）, X ray photoelectron spectroscopy （XPS） , which show that SiO₂/F-PEG and TiO₂-F/SiO₂/F-PEG have good properties of hydrophilic and oleophobic, and the performance of TiO₂-F/SiO₂/F-PEG is better than SiO₂/F-PEG, showing the property of superhydrophilic in the air （θwater≈0°） and superoleophobic both in air and underwater （θoil,in air≈146°, θoil,under water≈164°）. The efficiency of oil-water separation is 99% under the condition of gravity driven only. In addition, after 16 cycles, the coating still has a separation efficiency of 98%, and it also has a good self-cleaning performance, anti-fogging performance, acid alkali resistance, high temperature resistance and mechanical tensile strength.