| Abstract:This study utilizes unbleached eucalyptus pulp to prepare lignin-containing micro/cellulose nanofibrils, enhancing their waterproof by grafting long-chain alkanes with stearic acid. These modified fibers are then sequentially deposited on the original paper alongside unmodified lignin-containing micro/cellulose nanofibrils, forming a top layer of lignin-containing cellulose nanofibrils and a middle layer of modified fibers in a bilayer structure. Through a thermal pressing process, the bilayer fiber membrane is tightly bonded, improving the oil and water resistance of the paper-based composite material. Experimental results show that the Cobb value and air permeability of the paper-based composite material are significantly reduced to 16.53 g/m2 and 0.003 μm·Pa?1·s?1, respectively, which are 16.22% and 0.02% of those of the original paper; meanwhile, the kit value increased from 0 to 12, indicating significant oil-proof. The preparation process in this study is safe and environmentally friendly, providing a new approach for the green production of biomass-based food packaging barrier materials. |