Biomass-based fiber composite material and preparation method therefor and use thereof

A method for preparing a biomass-based fiber composite material, comprising the following steps:

• soaking cypress stem bark in a sodium hydroxide solution with a mass concentration of 15-20 g/L for 30-60 hours;
• adding a sodium silicate degumming agent to the soaked cypress stem bark, and steaming at 120-160° C. to decompose the colloid in the fiber;
• the steaming time is 4-8 hours, and the sodium silicate is added in the form of a sodium silicate solution with a concentration of 2-4 g/L;
• adding a solution containing sodium sulfite and compound sodium phosphate to the steamed cypress stem bark, and allowing the solution to stand for 20-30 hours to obtain cypress fiber;
• the solution containing sodium sulfite and compound sodium phosphate is prepared by adding sodium sulfite and compound sodium phosphate to water to obtain a solution containing sodium sulfite and composite sodium phosphate, wherein the concentration of sodium sulfite is 1-4 g/L and the concentration of compound sodium phosphate is 1-4 g/L;
• adding the cypress fiber to a bulking agent containing a metal oxide and subjecting to bulking treatment at 35-60° C.;
• the bulking treatment lasts for 2-3 hours;
• the bulking agent is prepared by adding MgO to water to obtain a bulking agent, wherein the MgO concentration is 10-15 g/L;
• adding a qualitative agent to the bulked cypress fiber for treatment at 25-30° C. for 25-30 minutes, wherein, the qualitative agent is prepared by adding CuCl2 to ammonia water to obtain a copper ammonia solution, i.e., the qualitative agent;
• the copper ion concentration in the copper ammonia solution is 0.5-1.5 mol/L;
• drying the cypress fiber after qualitative treatment;
• pyrolyzing the cypress stem at 600-700° C. for 2-4 hours under an inert atmosphere to obtain a silicon-carbon material;
• grinding the silicon-carbon material into powder to obtain carbon powder;
• mixing the carbon powder with a polypropylene resin, adding ethanol as a solvent, then adding polyacrylate as a dispersant, stirring, to obtain a slurry;
• the mass ratio of the carbon powder to the polypropylene resin is 1:(1-3), the mass ratio of the carbon powder to the ethanol as a solvent is 1:(38-42), and the mass ratio of the carbon powder to the polyacrylate is (40-42):1;
• coating the slurry to the surface of the dried cypress fiber, curing and spinning into fiber precursors;
• and
• weaving the fiber precursors into fiber cloth through a weaving process.