Fabrication And Performance Study Of The Polysulfone-based Composite Superhydrophobic Coatings

Research and development of new materials has been the research emphasis and hotspot in the field of scientific research. The superhydrophobic function biomimetic materials keep water droplets in the coating surface into spherical and infiltration characteristics with good wear resistance, corrosion resistance and other functions. As a result it has a broad prospect whether in academic or in industrial applications. However, how to use a method with simple preparation, low cost, fast and green process to fabricate a functional superhydrophobic coating is always a challenging problem for researchers.In this paper, the superhydrophobic and high oleophobic coatings with heat resistance,wear resistance and corrosion resistance were prepared by simple spraying, phase separation and electrostatic powder spraying. The superhydrophobic coatings were analyzed by scanning electron microscopy(SEM), contact angle measuring instrument, thermogravimetric analysis(TGA), Fourier transform infrared spectroscopy(FT-IR) detection, X-ray diffraction(XRD),and electrochemical workstation. The main contents of this paper can be summarized as follows:(1) Carbon nanofiber particles and silicon dioxide micron particles were modified by chemical method to achieve hydrophobicity. The polysulfone/silica micron particle composite coating was used as substrate by a simple spraying method, and then polysulfone/carbon nanofiber nanoparticles were used as the second layer. The Nano-micro scale rough structure was obtained by controlling curing time and temperature. The coating properties were characterized by a variety of methods. The results show that the coating can reach superhydrophobic state of 162° and maintain heat resistance, wear resistance, corrosion resistance.(2) The superhydrophobic coatings were prepared by thermally induced phase separation principle. The PMMA, PS and carbon nanofiber were dissolved to spread onto the glass surface. After curing the glass surface formed a uniform and functional coating. The carbon nanofibers were diffused to the coating surface under the role of thermal induced phase separation. The coating was completely depended on the structure of the material to reach superhydrophobic. After testing, the coating could also be applied to aluminum and steel. The contact angle of water could reach 165 degrees, and the sliding angle was only 5 degrees. The coating also had a good heat resistance, wear resistance and corrosion resistance, which werederived from the nano-micro rough structure.(3) The superhydrophobic coating was prepared by electrostatic powder spraying method with bionic dandelion structure. Epoxy as first layer coating and polysulfone and carbon nanotubes as the primary powder substance, the composite coating was prepared by electrostatic powder spraying method. The powder was adsorbed to the surface of the substrate under electrostatic interaction. The substrate could be aluminum, steel, glass and steel pipeline. The coating could keep excellent superhydrophobic state of 166° and high oleophobic, self cleaning, heat resistance, impact resistance, corrosion resistance performance,which make the prepared coating in practical industrial application with potential application in industry.