Research Of Inorganic Nano-powders Modified Exterior Architectural Latex Coating

On the basics of briefly summarizing the research and application presents of building coatings and nano-composite building coatings in domestic and overseas, presented a creative approach of modified exterior building latex coatings applying inorganic nano-powders and its' compound. Systematically studied the effect of factors such as nano-materials' category, additive capacity, dispersing method on the behavior of exterior building coatings' weathering resistance, scratch resistance, water resistance and alkaline resistance etc.Studying on UV-Vis optical property of nano-powder materials and its' compounds turned up that nano-TiO2, nano-SiO2,nano-ZnO have excellent characteristics to UV shielding; Dispersing system of polybasic nano-composite materials owned higher UV shielding capability than single disperse system.Employing different dispersing technology, applying nano-TiO2 nano-SiO2, nano-ZnO and its' composite powders to normal acrylic or styrene-acrylic latex coatings to manufacture nano-modified latex coatings. The results of performance testing showed that the additive of nano-powders can evidently enhance the latex coatings' weathering resistance, scratch resistance, water resistance and alkaline resistance, and do not reduce other performances; Polybasic nano-composite powders have more efficient than single nano-powder; the dispersing method have biggish effect on performances.Observing the stability of nano-additive of exterior latex coating showed there was no viscidity rising, no delaminatiom sedimentation in two months. Tryout by plant showed that nano-weatherability additive can obviously enhance the weathering resistance of latex coating and water resistance, and no reducing othercapabilities.