PP vacuum electroplating treatment agent enhances the adhesion of electroplating UV primer on PP plastic substrate

Problem phenomenon:

　　 PP plastic shell vacuum electroplating process, after the overall process is completed, the adhesion of the coating is tested through the 100 grid, and the phenomenon of paint drop is found, and the 100 grid test fails.

    Cause Analysis:

First of all, the process of vacuum electroplating of the PP plastic shell is spraying UV primer, then vacuum plating, and then spraying UV topcoat. The overall peeling occurs. It can basically be determined that the UV primer and the PP plastic substrate do not form a strong adhesion bond. of. The main reason is that PP plastic is a non-polar and highly crystalline substrate, and its surface energy is also low and it is difficult to be oiled. Therefore, the surface needs to be pre-treated and surface-treated before spraying.

    solution:

To enhance the adhesion between the PP plastic vacuum plating UV primer and the surface of the substrate, the traditional method is to use flame treatment, but its timeliness and improving the adhesion stability are difficult to stabilize, and the miter between the processes is too much Tightness has a greater impact on the efficiency of production arrangements. The method of filling PP vacuum plating treatment agent through the primer is different. Others are directly sprayed on the surface of the PP plastic and then sprayed with UV primer. Through the film layer of the polymer, it can improve the wetting of the paint and improve the surface polarity of the substrate. At the same time, it forms a covalent bond with the paint resin to enhance the adhesion of the UV primer on the PP plastic substrate.