This invention discloses a UV-curable
coating composition, its preparation method, and its application. The UV-curable
coating composition includes a UV-curable primer and a UV-curable topcoat. The UV-curable primer is composed of
polyurethane acrylate resin, a first
acrylate monomer, a
photoinitiator, an adhesion
promoter, and a
wetting and leveling agent in a specific ratio, and after curing, it forms a
coating with strong adhesion on a
nickel-plated substrate. Furthermore, by optimizing the formulation of the UV-curable topcoat, it promotes efficient bonding between the topcoat and primer when used in conjunction with the primer, imparting excellent insulation properties to the coating. The UV-curable coating composition provided by this invention can form a
composite coating with strong adhesion, excellent insulation properties, and high stability on the surface of a
nickel-plated substrate. Its adhesion performance is grade 1 or higher, and it passes
voltage resistance and
electrolyte resistance tests. Even after aging under double 85 conditions for 1000 hours, it still maintains excellent adhesion and insulation stability.