In addition, the compatibility and stability of the antibacterial agent in the film should be improved. For example, although the nano-TiO2 photocatalyst antibacterial agent has excellent antibacterial properties in the film, it has a destructive effect on the film-forming substance acrylate copolymer during use. In addition, nanometer TiO2 photocatalyst antibacterial agent is difficult to exert its proper effect in acrylic latex paint. In addition, efforts should be made to develop other new high-efficiency antibacterial agents, such as negative ion antibacterial agents, etc .; further study of the antibacterial mechanism of various antibacterial agents; standardization of the antibacterial market, these are bound to promote the application of antibacterial agents in films .