Characterization of Coating Properties of UV-curable Fluorine-Containing Coatings

Abstract

In this study, fluorine chains were bonded with covalently in epoxy acrylate system via UV light. For this purpose, five different coating samples prepared. Bisphenol-A glycerolate diacrylate (epoxy acrylate) and 1,6-Hexanediol diacrylate were used as the main coating solution. The weight ratio of Bisphenol-A glycerolate diacrylate and HDDA was determined as 7/3. As a long fluorine chain, 1H,1H,2H,2Hperfluorodecyl acrylate (PFOA) was added into the main coating solution in the ratios of 0.25 wt %, 0.50 wt %, 0.75 wt % and 1 wt %. All prepared solutions were coated on aluminum plates by 75 µm by wire wound applicator and then cured via UV dryer. Physical properties of coatings were measured by tests such as MEK rubbing test for solvent resistance, gloss 60 o test for brightness, cross-cut test for adhesion property and pencil hardness test for scratch resistance. Hydrophobicity was measured as static water contact angle test. The total surface energy was calculated by contact angle measurement software. In terms of mechanical properties, sheen impact test (for coating samples) and ShoreD hardness tests (for free film samples) were carried out. By examining the results of all these tests; cross-cut adhesion and gloss 60 o values decrease with the fluorine content. On the other hand, by the increasing within the content of the fluorine chains, Taber abrasion resistance and hydrophobicity increase significantly but sheen impact resistance and ShoreD hardness values decrease slightly. In terms of cost and overall results, the most proper and multifunctional coating seemed at 0.25 wt %.

Multi‐featured epoxy composites filled with surface‐modified PTFE powders treated by Na‐naphthalenide system

“…Metals, oxides, nitrides, carbides, solid lubricants, and short fibers have been used in epoxy systems to overcome these limitations. [2][3][4]17 Moreover, these conventional fillers or reinforcement materials have provided improvements in certain properties. For instance, while strength or modulus values of the manufactured composites increase, impact resistance values substantially decrease or do not show remarkable improvement, or vice versa.…”

“…The desired wear resistance, thermal properties, and mechanical properties of epoxy systems also need to be increased to higher levels for some engineering applications such as gears, cams, wheels, impellers, brakes, clutches, conveyors, transmission belts, bushes, and bearings. Metals, oxides, nitrides, carbides, solid lubricants, and short fibers have been used in epoxy systems to overcome these limitations 2–4,17 . Moreover, these conventional fillers or reinforcement materials have provided improvements in certain properties.…”

“…Composite are prepared for various purposes such as improving mechanical properties, wear properties, and thermal properties, [1][2][3][4] and obtaining enhanced photocatalytic, [5][6][7][8] antibacterial, [9][10][11] hydrogen storage, 12,13 flame retardation properties, 14 antistatic and electrically conductive materials. 15,16 Composites with favorable mechanical properties and wear resistance have considerable demand in the industries that include mechanical applications such as gears, cams, wheels, impellers, brakes, clutches, conveyors, transmission belts, bushes, and bearings.…”