Preparation and characteristics of a waterborne preventive stain coating material with organic-inorganic composites
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With the goal of developing a waterborne coating material that prevents staining, organic-inorganic composites prepared from colloidal silica and two types of acrylic resin emulsions were investigated as exterior coatings. conventional acrylic resin emulsion and organic silane hybridized acrylic resin emulsion prepared by emulsion polymerization were mixed with colloidal silica to form organic-inorganic comiposite films. The addition of colloidal silica to emulsions yielded films with higher hydrophilicities, as indicated by lower water contact angles for these films in comparison to films without colloidal silica. The water contact angles of organic silane hybridized acrylic resin emulsion/colloidal silica films were lower than those of acrylic resin emulsion/colloidal silica films. Composite films containing colloidal silica particles smaller than 100 nm in diameter showed high hydrophilicities. Observations of the dispersed state of colloidal silicaparticles in organic-inorganic composite films by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) demonstrated that colloidal silica particles were densely aggregated on the film surface. Outdoor exposure tests of the coating materials prepared from organic silane hybridized acrylic resin and colloidal silica particles with diameters of 7.5 nm showed excellent stain resistance.
KeywordsAcrylics latexes colloids emulsions silicones silicates stain resistance weatherability architectural water-based
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- (1).Yoshida, M., “Ultra-Weatherability Coating Based on Acrylic Resins,” Shikizai Kyokaishi, 64 (9) 589–597 (1991).Google Scholar
- (2).Munekata, S., “Fluoropolymers as Coating Mateiral,” Prog. Org. Coat., 113–134 (1988).Google Scholar
- (5).Kenmotsu, N., Kittaka, Y., Kamimura, K., Takeuchi, T., and Konishi, T., “Relation Between Soiling Behavior and Surface Properties of Building External Paints. Basic Examination on the Effects of Contact Angle, Glass Transition Temp., Hardness and Roghness (Part 1),” Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan A-1 Materials and Construction, 91–92 (1992).Google Scholar
- (6).Kenmotsu, N., Kittaka, Y., Kamimura, K., and Konishi, T., “Relation between Soiling Behavior and Surface Properties of Building External Paints. Basic Examination on the Effects of Contact Angle, Glass Transition Temp., Hardness and Roughness (Part 2),” Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan A-1 Materials and Construction, 1205–1206 (1994).Google Scholar
- (7).Kuzumi, A., Ando, T., Kato, Y., and Kondo, T., “Stain Resistance of Acrylosilane Coating,” Japan Society for Finishing Technology (1994).Google Scholar
- (14).Uragami, T., Katayama, T., and Miyata, T., “Pervaporation Properties for an Azeotrope of Ethanol/Water Through Organic-Inorganic Hybrid Membranes from Quaternized Chitosan with Tetraethoxysilane,” Trans. Mater. Res. Soc. Jpn., 29, 3295 (2004).Google Scholar
- (17).Uragami, T., Matsugi, M., and Miyata, T., “Pervaporation Characteristics of Organic-Inorganic Hybrid Membranes Composed of Poly(vinyl alcohol-co-acrylic acid) and Tetraethoxysilane for Water/Ethanol Separation,” Macromolecules, 38 (8), 440 (2005).Google Scholar
- (20).Kakui K., Murakami, N., Osawa, S., Okamoto, H., and hasegawa, T., “New Technology About the Reduction in Contamination of Ecofriendly Coatings. Development and Evaluation of Water Based High Durability and Stain Resistance Coatings,” Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan A-1 Materials and Construction (2002).Google Scholar
- (21).Wada, T., Inui, K., and Uragami, T., “Properties of Organic-Inorganic Composite Coating Materials Prepared from Acrylic Resin Emulsions and Colloidal Silicas,” J. Appl. Polym. Sci., 101, 2951 (2006).Google Scholar
- (22).Motohashi, K. and Soga, M., “Evaluation of Soiling Due to Rain Trace on the Coated Layers,”. The 2002 Global Symposium, 760 (2002).Google Scholar
- (23).Kiryu, H. and Kasamatsu, H., Foundation and Physical Properties of High Efficient Paint, Cmc Shuppan, Japan, 1985.Google Scholar