Studies On Fabrication, Structure And Properties Of Superhydrophobic Surface Based On Organosilicone

A superhydrophobic coating possessed many unique properties, such as self-cleaning,superhydrophobic and anti-icing, etc. These properties make superhydrophobic coatings haveimportant application prospects in industrial and agricultural production, national defense andpeople’s daily lives. As the wettibility of the surface is decided by both the chemicalcomposition and surface microstructure of the surface, so the control of surfacehydrophobicity can be achieved by changing the material based on chemical composition andsurface structure. Basing on this theory, we prepared the superhydrophobic samples by twotechniques. Finally, a hypothesis micro/nano model is created based on literatures, while Itscorresponding formula is deduced.1. Preparing organosilicone superhydrophobic surface by copolymerization. Thesuperhydrophobic compositions were synthesized using methyltrimethoxysilane (MTMS),propyltrimethoxysilane (PTMS) and diphenyldimethoxysilane (DPDS) as a co-precursorreacting with fumed nanoSiO2particles. This kinds of organic silicon monomer as material isused to prepared excellent comprehensive performance silicone varnish. Thesuperhydrophobic coatings whose micro/nano structures were adjusted by nanoSiO2contentwere prepared by just spraying the in-situ polymerization compound on substrate.Enhancement in wetting behavior was observed for surface which showed a maximum staticwater contact angle154°and a minimum sliding angle1°. The hydrophobic coating retainedtheir superhydrophobicity up to a temperature of460℃, and meanwhile the hydrophobiccoatings possessed good properties of resistance-corrosive solution, and good adhesion, Thewrecked superhydrophobic coatings undergoing extreme low temperature and mechanicaldamage could restore and repair the superhydrophobicity easily by heat treatment or spraying.The superhydrophobic coatings were characterized by Scanning Electron Microscopy (SEM),Fourier Transform Infrared (FT-IR) spectroscopy, contact angle (CA)/sliding angle (SA)measurements and thermal stability analysis.2. Preparing organosilicone superhydrophobic surface by co-blend. Thesuperhydrophobic coatings were prepared using dip-coating and withdrawal method，in whichthe monodisperse nano-particles silica spheres was modified with hydroxyl silicone resin, andthe coatings were cross-linked by heat curing The research studied the effect of the size of thesol nanoSiO2particles and content of the silicone resin on the hydrophobic performance, Thevariation of superhydrophobic properties of the coatings after high temperature and acid, alkaline and salt solution were discussed． In addition， the coatings can keepsuperhydrophobicity under the450℃and at different pH aqueous solution and saline solution,as well the superhydrophobic sample remains superhydrophobicity with contact angle of148°and sliding angle of5°after being placed in air for12months. We study the effect thenumber of coating times and withdrawal rate on hydrophobic performance of coating. Themicro-nano hierarchical rough morphology was observed by scanning electron microscopy(SEM).3. A micro/nano model is established and the wetting state of a water droplet onsuperhydrophobic surface is modeled. Based on this，the formula is derived, which the effectnanoscalestructure and its distribution on the microstructure surface on on the surface.