Preparation method of multifunctional modified molybdenum disulfide nano-additive added to cutting fluid

A preparation method for a multifunctional modified molybdenum disulfide nano-additive, characterized in that, comprising following steps:

• step 1:
• synthesizing a lignocellulose, specifically comprising:
• step 1.1:
• placing a baked wood sample in a vacuum flask covered with a diaphragm, then adding a BiBB solution to the flask slowly with a syringe, and adding a glucopyranose to obtain a reaction system, stirring the reaction system at room temperature for a predetermined time, taking out the wood sample and blotting with paper, washing the wood sample with acetone three times to obtain the functional wood W-Br, drying the obtained functional wood W-Br at 65° C. for 24 hours under vacuum, and reacting the dried functional wood W-Br in THF/Et3N tetrahydrofuran/triethylamine and pyridine solution, respectively;
• step 1.2:
• using the reacted functional wood W-Br as an ATRP macroinitiator for in-situ polymerization, performing a catalytic reaction of styrene St and N-isopropyl acrylamide NIPAM as monomers, with copper-based complexes pentamethyldiethylenetriamine PMDETA as catalyst, setting ATRP ratio to 50:1:1:3 based on the catalytic reaction, placing the reacted functional wood W-Br in a first Schlenk flask equipped with a gas inlet and a septum, introducing CuBr, the reacted functional wood W-Br, styrene St, N-Isopropyl Acrylamide NIPAM, copper-based complexes pentamethyldiethylenetriamine PMDETA and a solvent in a second Schlenk flask to get a third mixed solution, then degassing the third mixed solution, transferring the third mixed solution after the complete degassing to the first Schlenk flask containing the reacted functional wood W-Br, heating the first Schlenk flask to 65° C. to perform a polymerization under a tight nitrogen atmosphere for a given time, after the polymerization, ventilating the first Schlenk flask, and taking out the functional wood W-Br and washing with acetone or ethanol, or water to obtain a W-polymer sample, lastly, drying the W-polymer sample under vacuum for 24 hours to obtain the lignocellulose;
• step 2:
• synthesizing lignocellulose/MoS2 composite nanoparticles, specifically comprising:
• adding a sodium molybdate and a thiourea into deionized water, mixing uniformly to get a uniform and transparent molybdenum precursor solution;
• adding a lignocellulose into deionized water and stirring uniformly to obtain a lignocellulose aqueous solution, slowly adding the lignocellulose aqueous solution into the molybdenum precursor solution to obtain a first mixed solution, continuously stirring until the first mixed solution becoming sol-emulsion, transferring the first mixed solution to a reactor, carrying out the reaction at a predetermined temperature for a predetermined time to yield a product, and then filtering and washing the product after the reactor is cooled, filtering a black substance from the product, drying the black substance in a vacuum oven to obtain black nanoparticles, gently grinding the black nanoparticles until there is no hard lump to obtain the lignocellulose/MoS2 composite nanoparticles as solid powder;
• and
• step 3:
• synthesizing a lignocellulose/MoS2—Ag nanocomposite to obtain the multifunctional modified molybdenum disulfide nano-additive, specifically comprising:
• dissolving lignocellulose/MoS2 composite nanoparticles, a casein hydrolysate and a sodium hydroxide in deionized water with stirring, adding a silver nitrate solution dropwise to obtain a second mixed solution, stirring the second mixed solution at a predetermined temperature for a predetermined time, then mixing with alcohol and centrifuging with high speed to yield a precipitate, lastly, after washing the precipitate and drying under vacuum to obtain the lignocellulose/MoS2—Ag nanocomposite, namely the multifunctional modified molybdenum disulfide nano-additive.