Paper-based/silica sol/polyvinyl alcohol (PVA) color-changing composite film for detecting water-injected meat, preparation method and application thereof

The invention discloses a paper base/silica sol/polyvinyl alcohol (PVA) color-changing composite film for detecting water-injected meat, a preparation method and application thereof, belonging to thefield of meat quality detection. A paper base selected by the composite film is dust-free paper which is a non-woven mixed structure composed of 55% cellulose and 45% polyester fiber and has excellenttensile strength, excellent liquid absorption performance and anti-dissolution performance. A composite coating composed of silica sol and PVA has the characteristics of good film-forming property and strong water absorption. The film has excellent mechanical properties, good stability and long service life. The paper base/silica sol/polyvinyl alcohol (PVA) color-changing composite film is less affected by moisture in the environment and is convenient to store. The used color-changing composite film can be put into an oven with 100 DEG C for re-drying to realize recycling. According to the method, a mixed liquid conta