Method of Preparing High-Strength, High-Toughness, and Recyclable Fiberboard with Bionic Structure

A method of preparing high-strength, high-toughness, and recyclable fiberboard with bionic structure, characterized in that, the method is carried out according to the following steps:

• (1) Pretreatment:
• obtaining wood processing residues and sequentially removing lignin portion partially from the wood processing residues and processing drying treatment;
• then obtaining wood processing residues with partial lignin removal;
• (2) Swelling Treatment:
• under room temperature conditions, immersing the wood processing residues with partial lignin removal in an activation solution for 30 minutes to 3 hours, then replacing the activation solution and repeating the step of immersing the wood processing residues with partial lignin removal in the activation solution for 30 minutes to 3 hours for 1-5 times to obtain swollen wood processing residues;
• (3) Dissociation and Dispersion Treatment:
• adding the swollen wood processing residues into a cellulose solvent, stirring continuously for 5-30 minutes at a temperature of −20C.-150C., then finally allowing to stand and react for 5-10 minutes to obtain a high-viscosity, milky white, multi-scale cellulose mixed solution,
• wherein the high-viscosity, milky white, multi-scale cellulose mixed solution has a density of 0.8 g/cm3-3 g/cm3;
• (4) Centrifugation:
• placing the high-viscosity, milky white, multi-scale cellulose mixed solution in a centrifuge and processing centrifugation to remove bottom sediments and then to obtain a high-viscosity, uniformly dispersed multi-scale cellulose solution,
• wherein the high-viscosity, uniformly dispersed multi-scale cellulose solution has a density of 0.5 g/cm3-2 g/cm3;
• (5) Hydrogel Construction:
• pouring the high-viscosity, uniformly dispersed multi-scale cellulose solution into a mold, and standing for 2-10 hours for solidification, then immersing in a regeneration solution for 5-20 hours and finally washing to obtain a uniform multi-scale cellulose hydrogel;
• (6) Densification Treatment:
• putting the uniform multi-scale cellulose hydrogel in a hot press machine and processing hot-pressing to obtain a high-strength, high-toughness, and recyclable fiberboard with bionic structure.