In this study, enhancing of some characterizations of water-based coating, . physicmechanical properties, thermal resistance and weathering durability by adding nanosilica were investigated. | Vietnam Journal of Science and Technology 56 (3B) (2018) 117-125 EFFECT OF SILICA NANOPARTICLES ON PROPERTIES OF COATINGS BASED ON ACRYLIC EMULSION RESIN Dao Phi Hung1, Nguyen Thien Vuong1, 2, *, Dang Manh Hieu3, Nguyen Thi Linh3, Trinh Van Thanh1, Mac Van Phuc1, Nguyen Anh Hiep1, Duong Manh Tien4 1 Institute for Tropical Technology, VAST, 18 Hoang Quoc Viet, Cau Giay, Ha Noi 2 Faculty of Materials Science and Energy, Graduate University of Science and Technology, VAST, 18 Hoang Quoc Viet, Cau Giay, Ha Noi 3 Hanoi University of Mining and Geology, 10 Pho Vien, Bac Tu Liem, Ha Noi 4 Vietnam Institute of Industrial Chemistry, Phuc Dien, Bac Tu Liem, Ha Noi * Email: vuongvast@ Received: 9 July 2018; Accepted for publication: 8 September 2018 ABSTRACT In this study, enhancing of some characterizations of water-based coating, . physicmechanical properties, thermal resistance and weathering durability by adding nanosilica were investigated. Nanocomposite coating formulas were filled by 2 wt.% nanosilica particles which were used in this study, namely: nanosilica from Sigma (10-20 nm), nansilica from rice husk (RHA) (~50-200 nm) and nanosilica from Arosil – Belgium (7-12 nm). The obtained results showed that in presence of nanosilica, coating properties were improved in comparison with neat coating. However, coating filled by nanosilica from rice husk indicated the best properties in studied coating formulas. It may be explained that nanosilica from rice husk was in hard spherical shape while other kinds of nanosilica were in porous shape. Keywords: nanosilica, physic-mechanical properties, weathering durability, thermal stability, acrylic emulsion. 1. INTRODUCTION Organic coatings have been using in various applications with protecting and decorating all kinds of materials surface purpose. Coatings can be divided two categories: water and solventbased coating. In there, solvent-based coatings have been become popular in a huge range of applications .