Study On Preparation And Properties Of NANO-ZnO/WPU Hybrid Material

Nano-ZnO was modified by titanate coupling agent and optimization of modified technology. The structure of nano-ZnO before and after the modification was characterized by FTIR and SEM. The effect of types and amount of titanate coupling agent, reaction temperature and time, dissolvent concentration on nano-ZnO surface modification have been studied.Through the tensile strength and elongation at break of modified nano-ZnO/WPU hybrid materials to evaluate the modification effect of nano-ZnO, the result showed that: the tensile properties of hybrid material was best when the amount of the titanate coupling agent was2wt%, the reaction temperature was50"C, the reaction time was70min, the isopropyl alcohol concentration was9.81mol/L.Pure WPU film and modified nano-ZnO/WPU hybrid material were characterized by FTIR. The effect of nano-ZnO and adding method of modified nano-ZnO on basic properties of hybrid emulsion and water resistance and tensile properties of the coating films were discussed. Meanwhile, the influences of the content of nano-ZnO and hydration temperature on appearance, viscosity, particle size of hybrid emulsion and water absorption and tensile properties of the coating films, and adding amount on uv resistance, storage stability, surface tension of emulsion, friction properties, pencil hardness and adhesion of coating films were discussed. Compared with adding unmodified nano-ZnO, adding modified nano-ZnO can improve the tensile properties and water resistance of hybrid film in a certain extent. The tensile properties and water resistance of modified nano-ZnO/WPU hybrid emulsion which be prepared by modified nano-ZnO was added inreaction proces were significantly increased. The increasing of nano-ZnO content resulted in that the particle size kept rising went up then down for the hybrid emulsion. Adding proper amount of modified nano-ZnO may appropriately reduce emulsion surface tension, improved the tensile properties, strengthened wear resistance, water resistance, pencil hardness and adhesion, the hybrid films exhibited favorable comprehensive properties with the addition of0.3wt%. The influence of hydration temperature on particle size was not obvious, the increasing of hydration temperature resulted in that tensile strength and elongation at break increased and then decreased; along with the increase of temperature hydration, water absorption was higher.