A Novel Waterborne Acrylic Coating Incorporation TIO2 Nanoparticles Modified With Silane Coupling Agent and Ag/zn Zeolite: Mechanical Properties, Thermal Stability, Artificial Weathering Durability and Antibacterial Activity

Abstract Effect of rutile TiO2 nanoparticles modified with 3-(trimethoxysilyl) propyl methacrylate silane - TMSPM (m-TiO2) and Ag/Zn zeolite on the properties, and durability of acrylic waterborne coatings was studied. The obtained results indicated that m-TiO2 nanoparticles and Ag/Zn zeolite could disperse regularly in the acrylic polymer matrix. Consequently, the abrasion resistance of the acrylic coating was improved in the presence of m-TiO2 or/and Ag/Zn zeolite. The abrasion resistance of the acrylic coating depended on the content of m-TiO2 nanoparticles as well as the initial TMSPM content for modification of rutile TiO2 nanoparticles. The abrasion resistance of the acrylic coating filled by m-TiO2 was higher than that of the acrylic filled by unmodified TiO2 nanoparticles. The acrylic coating filled by 2 wt.% TiO2 modified with 3 wt.% TMSPM had the highest abrasion resistance value, leveling off at 187.16 L/mil. The abrasion resistance of acrylic coating reduced with increasing too high initial TMSPM content for TiO2 modification and m-TiO2 nanoparticles content. The starting temperature of weight loss of acrylic coating filled by m-TiO2 was lower than that of the neat acrylic coating. In comparison with the m-TiO2 nanoparticles, the Ag/Zn zeolite particles showed a lower improvement for acrylic coating properties, i.e. abrasion resistance, weathering durability, but the Ag/Zn zeolite particles expressed an excellent antibacterial activity. Hence, combination of the m-TiO2 nanoparticles and Ag/Zn zeolite particles could enhance the properties of the acrylic waterborne coatings. The acrylic coating filled by 2 wt.% m-TiO2 nanoparticles and 1 wt.% Ag/Zn zeolite particles illustrated high abrasion resistance, good weather durability, and superior antibacterial activity for both of negative gram bacteria (E. Coli) and positive gram bacteria (S. Aureus). This coating is promising for environmental friendly building materials application.