Biodegradable paper-plastic composite structure and preparation method thereof

A biodegradable paper-plastic composite structure comprises: at least one cellulose acetate or derivative film thereof; the invention discloses a paper base material. The cellulose acetate or cellulose acetate derivative film is combined with a paper base material to form a paper-plastic composite structure. The cellulosic material included in the formulation includes cellulose acetate having a degree of substitution of 1.5 to 2.8 or a derivative thereof; and a plasticizer capable of reducing the softening temperature of cellulose is also included. The basic paper material is paper obtained after cellulose pulp is physically processed, such as kraft paper and parchment. The preparation method of the biodegradable paper-plastic composite structure comprises the following steps: compoundinga cellulose acetate film through a heating and pressurizing method, or compounding through a solution coating method, namely coating the surface of paper with a cellulose acetate solution; and evaporating a solvent to prepare