Fabrication And Wettability Of The Fluorine-containing Hydrophobic And Oleophobic Coatings

New material is the cornerstone of scientific and technological progress. Research anddevelopment of the bionic functional integrated materials are current topics and hotspots ofmaterial research in the21st century. Amphiphobic (hydrophobic and oleophobic) materials,especially superamphiphobic materials have attracted more and more attention because it iswidely practical application value. The research of preparation low-cost superamphiphobiccoatings has rarely been reported through simple method at home and abroad, as well as theresearch of amphiphobic and superamphiphobic composite coatings on friction and wearproperties. Because of these limitations and downsides, there is an interest influorine-containing composite coatings with good friction and wear properties for process,material, and economical reasons.In this paper, simple methods have been made to prepare fluorine-containing amphiphobiccomposite coatings and the amphiphobic properties are also explored after Al substrate ismade by acid etching. The coatings have used NH4HCO3as pore-forming reagent and asimple spraying method is used to fabricate PPS-based, porous PPS-based superamphiphobiccomposite coatings with the good performance, such as low-cost, high temperature toleranceand wear-resistance. The PPS-based composite coatings are analyzed from many perspectivesby using SEM, XRD, FT-IR, TGA and the tribological tester. The main contents andconclusions of this work are summarized as follows:(1) The etched aluminum plates as substrates and then modified by low surface energymaterials (fluorine-containing polymer A) so that made the coatings show hydrophobic andoleophobic. Results indicate that micro/nano composite structures of solid surfaces canprovide structural support for forming amphiphobic surface. Special one-dimensional tubularstructure of carbon nanotubes can provide efficient space frame, they play a supporting role inthe non-wettability of the solid surface. Modifying by the low surface energy materials canform amphiphobic surface easily.(2) The PPS-based coatings with the micro/nano composite structure and low surfaceenergy materials design have the excellent superamphiphobic, heat-resistance, anti-corrosionand wear-resistance properties. The results show that, when fluorine-containing polymer B’scontent increases to43wt%, a small amount of surfactant A was added, the coating’s contactangles of water, glycerine, ethylene glycol, crude oil and oil-water mixture are173°,156°,153°,148°and152°, respectively. Furthermore, the coatings show outstanding anti-corrosion and heat-resistance. The PPS/43wt%fluorine-containing polymer B/PEEK coating does notshow any sign of failure until the experiments is stopped (about30h) and the contact angles ofwater, glycerine and ethylene glycol can still keep amphiphobic.(3) Porous PPS-based composite superamphiphobic coatings are prepared with apore-forming reagent of NH4HCO3, and the surface morphologies and wear-resistanceproperties are studied. Results indicate that the PPS-based composite coatings usingNH4HCO3as pore-forming reagent is superamphiphobic. When content of NH4HCO3is5wt%,contact angles of water, glycerine and ethylene glycol are162°,158°and152°, respectively.In addition, porous PPS-based superamphiphobic coatings also have preferable performanceon the friction and wear experiment. When the contents of NH4HCO3are5wt%-10wt%,coatings can remain slight friction marks after polished10000times by1000-grit abrasivepaper.