Vacuum plating under-coating paint as well as application and preparation method of vacuum platable hard thin film for IML prepared from vacuum plating under-coating paint

The invention discloses a vacuum plating under-coating paint as well as a preparation method and an application of a vacuum platable PET hard thin film for IML. The vacuum plating under-coating paint is prepared from the following components: 10-30 parts of polyurethane acrylate, 5-10 parts of epoxy acrylate, 5-10 parts of modified acrylate, 0.5-2 parts of flatting agent, 1-2 parts of photoinitiator and 50-70 parts of organic solvent. The vacuum plating under-coating paint for a PET substrate is produced by evenly mixing a reactive diluent, the flatting agent and the organic solvent together, next, adding the polyurethane acrylate, the epoxy acrylate and the modified acrylate and mixing evenly, and then adding the photoinitiator at the final stage for dispersing evenly; the vacuum plating under-coating paint is applicable to preparing the vacuum platable PET hard thin film for the IML; the cost can be effectively reduced; the obtained vacuum platable PET hard thin film for the IML has certain forming tensile properties, and the outer layer of the hard thin film has high hardness and high wear resistance, while the inner layer of the same has excellent adhesion to a metal coating and a screen printing ink layer, and furthermore, the metal coating is excellent in glossiness.