Preparation method of slow-release chlorine dioxide film

The invention discloses a preparation method of a slow-release chlorine dioxide film, which relates to the technical field of chemical preparation. The method comprises the following steps of (1) preparing an inner film, (2) preparing a slow-release control layer on the surface of the inner film, (3) preparing a chlorine dioxide release layer on the surface of the slow-release control layer, and (4) preparing an outer film on the surface of the chlorine dioxide release layer. The slow release control layer comprises alkali, and the chlorine dioxide release layer comprises a chlorine dioxide precursor and an acidic solid. According to the preparation method of the slow-release chlorine dioxide film provided by the invention, the chlorine dioxide or the precursor thereof or the microcapsulethereof is not simply dispersed in a certain layer of matrix film-forming material in the film as a traditional method, but the chlorine dioxide precursor is prepared into solid particles with a multilayer structure; the soli