Method for reinforcing and enhancing bamboo/wood materials

A method for reinforcing and enhancing bamboo/wood materials, comprising:

• (1) preparation of a nanocellulose dispersion A:
• mixing fibers derived from cotton wool or cotton linter with a sulfuric acid solution having a concentration of 60% to 70%, and conducting reaction under a 40° C. to 60° C. water bath for 30 min to 40 min to form a reaction solution;
• then adding distilled water to the reaction solution to stop the reaction and form a diluted reaction solution, and centrifuging the diluted reaction solution at 1,200 rpm for 15 min to obtain a precipitate;
• placing the precipitate in a dialysis bag, and conducting dialysis in deionized water to form a dialysis fluid until a pH of the dialysis fluid is constant;
• and conducting suction filtration with a 0.22 micrometer filter membrane to obtain a residue, and diluting the residue to a final concentration of 1% to 2% to obtain the nanocellulose dispersion A;
• wherein the sulfuric acid solution is used at an amount of 10 mL/g fiber to 40 mL/g fiber;
• (2) preparation of a nano zinc oxide-nanocellulose composite solution B:
• with the nanocellulose dispersion A as a precursor and protection liquid for nano zinc oxide, adding a ZnCl2 aqueous solution to the nanocellulose dispersion A to prepare a mixture of nanocellulose dispersion A and ZnCl2;
• stirring the mixture of nanocellulose dispersion A and ZnCl2 under a 60° C. to 80° C. water bath for 10 min to 30 min;
• and nucleating generated nano ZnO crystals directly on nanocellulose to obtain a nano zinc oxide-nanocellulose composite solution B;
• wherein the ZnCl2 has a concentration of 0.1 mmol/L, to 1 mmol/L in the prepared mixture of nanocellulose dispersion A and ZnCl2;
• (3) preparation of treatment solutions:
• mixing polydimethylsiloxane (PDMS) having a mass concentration of 0.8% to 1.0%, hydroxypropyl cellulose (HPC) having a mass concentration of 1% to 1.5%, alkali lignin having a mass concentration of 0.5% to 1.0%, and phenol formaldehyde resin (PF) having a mass concentration of 3% to 5%, as a binder or consolidate, with the nanocellulose dispersion A at the following volume ratios to obtain treatment solutions a to e;
• respectively:
• a:
• nanocellulose:PDMS=2:1, pH 8.4, magnetic stirring at room temperature for 60 min;
• b:
• nanocellulose:Lignin=2:1, pH=7.5, magnetic stirring at room temperature for 60 min;
• c:
• nanocellulose:PDMS:Lignin=2:1:1, pH=8.0, magnetic stirring at room temperature for 60 min;
• d:
• nanocellulose:HPC=5:2, high-speed stirring at 10,000 rpm;
• and
• e:
• nanocellulose:PF=1:1, high-speed stirring at 10,000 rpm;
• (4) preparation of treatment solutions 1 to 5:
• mixing the treatment solutions a to e of step (3) with the nano zinc oxide-nanocellulose composite solution B at volume ratios of 1:(0.8-1.0) to obtain treatment solutions 1 to 5, respectively;
• and
• (5) treatment for bamboo/wood materials:
• impregnating samples with the treatment solutions 1 to 5 prepared in step (4) to obtain treated bamboo/wood materials.