The invention discloses a preparation method of a high-barrier antibacterial natural
cellulose-based packaging material, which comprises the following steps: taking alpha-
cellulose dissolving pulp, pulping to prepare pulp, taking chemimechanical pulp containing
cellulose,
lignin and
hemicellulose, mixing and pulping with the alpha-
cellulose pulp to prepare mixed pulp, and
drying to obtain the high-barrier antibacterial natural cellulose-based packaging material. The preparation method comprises the following steps: respectively preparing high-purity alpha-
cellulose pulp and mixed pulp into pulp making pools, carrying out net stacking and
papermaking to form composite paper with alpha-cellulose
layers on the surface and the bottom layer and a mixed cellulose layer on the core layer, soaking the composite paper in a functional group conversion solution, washing, soaking in a solution such as
ethanol, and
drying to obtain the composite paper with the alpha-cellulose
layers on the surface and the bottom layer. Preparing
chitosan into a
chitosan compound solution,
coating the surface of the cellulose wet film with the
chitosan compound solution, and carrying out
calendering treatment to form the packaging material; a multi-layer structure is formed through
papermaking, the tensile strength of the material is improved through
ionic solution impregnation, the
oxygen barrier performance is improved through
dehydration impregnation, the surface of a film body material is coated with chitosan composite
metal nanoparticles, the antibacterial performance is improved, and the packaging material with excellent comprehensive performance is integrally formed.