Antibacterial fresh-keeping composite film as well as preparation method and application thereof

The invention belongs to the technical field of packaging materials, and particularly relates to an antibacterial fresh-keeping composite film as well as a preparation method and application thereof. The preparation method of the antibacterial and fresh-keeping composite film comprises the following steps: dispersing nano-silver and polyethylene (PE) master batch at a high speed, stirring and mixing; the nano-silver-PE mixed particles are subjected to melt blending extrusion, bracing, cooling and grain-sized dicing, and antibacterial PE/Ag master batches are obtained; stirring and mixing the antibacterial master batch and the PE master batch, and heating and melting to obtain a molten nano-silver-PE compound; and after casting the composite film into a film, cooling and shaping to obtain the composite film. According to the preparation method, the problems of uneven distribution and agglomeration of nano-silver are solved, the prepared composite film is good in transparency and uniform in thickness and has ex