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

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.

Effect of the Type of Adhesives on the Properties of Multilayer Packaging Material Based on PET/AlOx Film with Acrylic Coating before and after the Sterilization Process

In this work the properties of multilayer packaging materials based on PET/AlOx film with acrylic coating were studied. Multilayer packaging materials were produced on industrial laminators using three different adhesive compositions with different content of reactive groups. It is shown that the peculiarity of the chemical nature of adhesive components affects the bond strength and the seal strength of multilayer packaging materials.

Research of the Influence of Silicate Fillers on Water Absorption and Microstructure of Styrene-Acrylic Dispersion Coatings

Permeability is important to ensure the protective properties of coatings based on styrene-acrylic dispersions. This indicator characterizes the complex of insulating properties of coatings, their ability to prevent the penetration of liquids, vapors and gases from the environment to the surface to be protected. It was studied the effect of aluminosilicate microspheres, which are characterized by the hydrophilic nature of the surface and highly dispersed silicate filler aerosil with a hydrophobised surface on the water absorption of styrene-acrylic coatings. Decreased of water absorption of styrene-acrylic coatings filled with aluminosilicate microspheres with the introduction of hydrophobised aerosil is linked to the fact that the fine aerosil with a high specific surface area provides the formation of a more densely packed structure. Thus, partially filling the interspherical space, which is formed by particles of microspheres with a diameter of 10-100 μm and reduces the surface defect of the styrene-acrylic coating. Localization on the surface of defective structures of particles of hydrophobised aerosil leads to a decrease in wetting of defective structures with water. Resulting deteriorating wetting the surface of the styrene-acrylic coating. Micrographs were taken to assess the nature of the distribution of aerosil on the surface of the styrene-acrylic coating. The analysis of the obtained micrographs confirms that the introduction of microspheres form large agglomerates, between which there are vacancies, which will negatively affect the technological and operational properties of the developed coatings. At the same time, the introduction of aerosil allows to obtain a more orderly structure, which allows to obtain a coating with lower internal stresses, increased aggregate stability and, as a consequence, with improved technological and operational properties.