Epoxy/ PVC/ Nanosilica Hybrid Coating as an Organic Coating with Enhanced Thermal Stability and Wear Resistance

Low resistance at high temperatures as well as low wear resistance are the limitations of polymer-based materials; therefore, to increase thermal stability and wear resistance of these materials, resistant coatings used to protect their surface in applications with good wear performance at high temperatures. The coating layer in this study includes epoxy resin mixed with polyvinyl chloride (PVC) as the organic phases, containing 5, 7.5, 10, 12.5, 15 and 17.5 %wt of the modified silica nanoparticles as inorganic phase are applied to polymeric substrates through dip-coating. Wear resistance, hardness and thermal gravimetry analysis (TGA) were used to evaluate the properties of applied hybrid coating. The results showed that the thermal stability of the substrate with Epoxy/PVC coating containing 12.5 %wt modified nanosilica had an increase up to 31.27% compared to the uncoated substrate. The hardness obtained in the uncoated substrate is 2H; While in substrates with coatings containing 12.5 and 15% wt of modified nanosilica increased to 6H. The wear rate of substrate with Epoxy/PVC hybrid coating containing 12.5 %wt of modified nanosilica had amount 75% reduce compared to the uncoated substrate. The results showed the potential ability of the formulated coating to enhance the working conditions of polymeric coating including high temperature and high wear conditions.