Epoxy resin, known for its outstanding thermal stability, excellent chemical resistance, and ease of processing, has found widespread applications. However, traditional epoxy resins face several challenges such as low thermal conductivity and mismatch of thermal expansion coefficient during the processing. To address these issues, modifying the functional groups on the main chain and incorporating fillers are effective methods for improving the thermal stability and surface chemistry of epoxy resin. In this study, 2,7-dihydroxynaphthalene (2,7-DHN) and epichlorohydrin (ECH) were utilized as raw materials to substitute the benzene ring structure in naphthalene-based epoxy resin. The synthesized epoxy resin (epoxy equivalent: 192.8 ~ 363.34 g/eq) subsequently underwent thermal gravimetric analysis (TGA), which revealed a weight loss of 2.26 wt.% before 200°C After additional purification, the resultant epoxy resin demonstrated a reduced chloride hydrolysis content, ranging from 140.1ppm to 451.6 ppm, compared to the untreated epoxy resin. To improve the surface chemistry, Ag-TiO₂ nanomaterials were incorporated into the epoxy resin. After curing, a significant reduction in the water contact angle on the surface was observed, decreasing from 80.7 degrees to 67.3 degrees. This indicates that the addition of Ag-TiO₂ enhances the surface hydrophilicity of the epoxy resin, thereby improving surface wetting and ease of cleaning. These modifications make the epoxy resin suitable for applications in architectural and automotive coatings.