Method for preparing environmentally-friendly high-strength wood composite material

A method for preparing an environmentally-friendly high-strength wood composite material, consisting of:

• S1. treatment with a dilute acid and ball milling:
• pulverizing wood into a wood flour, adding the wood flour to an acid solution, to obtain a first mixture, ball milling the first mixture to obtain a ball milled mixture, and filtering the ball milled mixture, to obtain a dually-treated wood flour;
• S2. treatment with alkali:
• adding the dually-treated wood flour obtained in S1 to a first alkaline solution, and performing a neutralization reaction, during which salt compounds are generated, to obtain a second mixture;
• S3. second treatment with alkali:
• adding a second alkaline solution to the second mixture obtained in S2 to remove part of lignin, to obtain a lignin-partially removed wood flour;
• S4:
• drying:
• washing the lignin-partially removed wood flour obtained in S3 with anhydrous ethanol, to obtain a washed lignin-partially removed wood flour, placing the washed lignin-partially removed wood flour in a thermostatic drying oven and drying, to obtain a dried lignin-partially removed wood flour;
• and
• S5:
• moulding by hot pressing of the dried lignin-partially removed wood flour:
• packing the dried lignin-partially removed wood flour uniformly in a mold, sending the mold to a press, subjecting the dried lignin-partially removed wood flour to hot pressing at a temperature of 100-120° C. and a pressure of 30-40 MPa for 1-2 h to obtain a hot-pressed material, and cooling the hot-pressed material, to obtain the environmentally-friendly high-strength wood composite material.