Fluorocarbosilane-Based Protective Coatings for Concrete

Abstract

The effectiveness of protective coatings based on 3-(2,2,3,3,4,4,5,5-octafluoropentyloxy)propyltriethoxysilane (OFTES) in protecting concrete surfaces against water was tested. For the synthesis of OFTES, 2,2,3,3,4,4,5,5-octafluoropentanol, which is a by-product in the synthesis of poly(tetrafluoroethylene), was used. The proposed silane is a cheaper alternative to the fluorinated organosilicon compounds currently used. The coatings were deposited by the sol-gel method. As a result of the creation of chemical bonds between the concrete surface and the silane, a coating was created that permanently increases the hydrophobicity of the concrete. Fluorine chains attached to silicon atoms are an effective barrier that prevents access to water and limits its impact on the concrete surface. As a result of the proposed silanization, the concrete surface obtained a hydrophobic character at contact angles of up to 126°, and the water absorption of the concrete decreased by up to 96%.

Surface treatments on concrete: an overview on organic, inorganic and nano-based coatings and an outlook about surface modification by rare-earth oxides

“…This reduces the adhesion of dirt, dust, and microorganisms on the surface and makes cleaning easier. 160 In addition, certain silanes can exhibit antimicrobial properties that inhibit the growth of bacteria, mold, and other harmful organisms. By providing a stain-resistant and hygienic surface, silane coatings help to maintain a clean and hygienic environment, particularly in areas where hygiene requirements are high, such as hospitals, food processing plants, and public facilities.…”