Transparent super hydrophobic coating for coloured paper/cotton and transparent glass/ based on fluorinated epoxy polymer

Super hydrophobic surface is widely used in paper, cotton and other surfaces, but the high transparency color/colorless cotton/paper/glass with super hydrophobic effect has been less studied. In this paper, the polymer P(GMA- r -FOEMA) was synthesized with glycidyl methacrylate (GMA) and perfluorooctane ethyl methacrylate (FOEMA) as monomers by traditional free radical polymerization, and a very dilute solution was prepare. The transparent super hydrophobic coating was prepared by soaking glass, paper, and cotton in this polymer solution. The results show that the optimal parameters of the transparent super hydrophobic surface of glass, paper, and cotton fabric (SG, SP, and SC) are as follows: polymer concentration is 5 g/L, 2 g/L, and 20 g/L, soaking time is 30 min, drying temperature is 120 o C and drying time is 30 min, respectively. The water contact angles (WCA) of SG, SP, and SC are 151 o , 163 o and 168 o respectively, and the water rolling angles (WSA) are 17 o , 7 o , and 19 o respectively. The Gibbs free energy (GFE) of the modified glass, paper, and cotton surfaces was reduced by 146.27 dyne/cm, 37.19 dyne/cm, and 89.17 dyne/cm, respectively. The modified substrate surface has good self-cleaning, wettability, acid-alkali resistance, abrasion resistance, tape adhesion resistance, UV resistance, and durability. The SC surface and SP surface have an obvious silver mirror phenomenon, and have floating phenomenon. The light transmittance of the glass surface did not change after the super hydrophobic modification. SP can be used for oil-water separation. Overall, in this paper, we synthesized super hydrophobic substances by a simple and easy-to-use traditional free radical polymerisation method, and constructed a transparent hydrophobic surface by using the polymer solution directly, which reduces the operation steps and facilitates the industrial application of super hydrophobicity.Meanwhile, our synthesised super hydrophobic substances can be used on glass surfaces.