▎ 摘　　要

NOVELTY - Preparing lubricating oil containing surface-modified carbon nanomaterial comprises (i) preparing modified graphene nanomaterials, adding graphene and dopamine hydrochloride into a aqueous solution, adding hydrogen peroxide, stirring, filtering, washing, and drying, (ii) preparing modified multi-walled carbon nanotube nanomaterials, adding multi-walled carbon nanotubes and dopamine hydrochloride into an aqueous solution of trimethylolaminomethane, stirring, filtering, washing, and drying, (iii) preparing modified carbon nanofiber nano-material, (iv) stirring and dispersing ultrasonically. USE - The method is useful for preparing lubricating oil containing surface-modified carbon nanomaterial. ADVANTAGE - The method: solves the problems of stability and dispersion; and generates ball effect and supporting effect; and improves the performance of the lubricant. DETAILED DESCRIPTION - Preparing lubricating oil containing surface-modified carbon nanomaterial comprises (i) preparing modified graphene nanomaterials in a ratio of 1-10 layers in a mass ratio of 6:1-2:1, adding graphene with sheet size of 20-1000 nm and dopamine hydrochloride into a aqueous solution with concentration of 0.01-0.10 mol/l tris(hydroxymethyl)aminomethane, where the volume of the aqueous solution of trishydroxymethyl aminomethane and the mass ratio of dopamine hydrochloride is 3-5 l/g, and adjusting the pH of the solution to 8-9, ultrasonically cutting, completely dissolving the dopamine, fully dispersing the graphene, adding hydrogen peroxide at rate of 30-50 ml of 5% hydrogen peroxide per gram of dopamine, stirring at 20-40 degrees C for 1-10 hours, filtering, washing, and drying to obtain graphene nanomaterial A1 coated with polydopamine, taking according to the mass ratio of A1 and alkyl amines is 1:4, adding into a solution of trimethylolaminomethane in ethanol at concentration of 0.01-0.10 mol/l, where the solvent in the ethanol solution is 95-99.5% of concentration of ethanol, the trimethylolaminomethane solution in ethanol has volume ratio and the alkylamine is 5-8 l/g, adjusting the solution pH to 8-9, stirring at 20-40 degrees C for 12-24 hours, filtering, washing and drying to obtain modified graphene lubricating oil additive A2, where the alkylamines are octylamine, decylamine, dodecylamine, tetradecylamine, hexadecylamine, octadecylamine, and acquired graphene nanomaterial A1 coated with polydopamine, (ii) preparing modified multi-walled carbon nanotube nanomaterials with purity of more than 95% and diameter of 8-30 nm according to mass ratio of 6:1-2:1, adding multi-walled carbon nanotubes of length 0.5-15 mu m and dopamine hydrochloride into an aqueous solution of trimethylolaminomethane at concentration of 0.01-0.10 mol/l, where the volume of the aqueous solution of trishydroxymethyl aminomethane and the mass ratio of dopamine hydrochloride is 3-5 l/g, adjusting the pH of the solution to 8-9, ultrasonically cutting, completely dissolving dopamine, fully dispersing the multi-walled carbon nanotubes, adding hydrogen peroxide at rate of 30-50 ml of 5% hydrogen peroxide per gram of dopamine, stirring at 20-40 degrees C for 1-10 hours, filtering, washing, and drying to obtain multi-walled carbon nanotube nanomaterial B1 coated with polydopamine, taking according to the mass ratio of B1 and alkyl amines is 1:4, adding into a solution of trimethylolaminomethane in ethanol at concentration of 0.01-0.10 mol/l, where the solvent in the ethanol solution is 95-99.5% of the concentration of ethanol, the mass ratio of ethanol solution of trimethylolaminomethane and alkylamine is 5-8 l/g, adjusting the solution pH is 8-9, stirring at 20-40 degrees C for 12-24 hours, filtering, washing, and drying to obtain modified multi-walled carbon nanotubes lubricating oil additive B2, where the alkylamines are octylamine, decylamine, dodecylamine, tetradecylamine, hexadecylamine, and octadecylamine, (iii) preparing modified carbon nanofiber nano-materials will having diameter of 50-200 nm in a mass ratio of 6:1-2:1, adding carbon nanofibers of 1-20 mu m in length and dopamine hydrochloride into an aqueous solution of trimethylolaminomethane at concentration of 0.01-0.10 mol/l, where the volume of the aqueous solution of trishydroxymethyl aminomethane and the mass ratio of dopamine hydrochloride is 3-5 l/g, adjustng the pH of the solution to 8-9, ultrasonically cutting, completely dissolving of dopamine, fully dispersing the carbon nanofibers, adding hydrogen peroxide at rate of 30-50 ml of 5% hydrogen peroxide per gram of dopamine, stirring at 20-40 degrees C for 1-10 hours, filtering, washing, and drying to obtain multi-walled carbon nanotube nanomaterial C1 coated with polydopamine, adding C1 and alkylamine in a ratio of 1.2:1-1:4 into a solution of trimethylolaminomethane in ethanol at concentration of 0.01-0.10 mol/l, where the solvent in the ethanol solution is 95-99.5% of the concentration of ethanol, and the volume of the trimethylolaminomethane solution in ethanol and the alkylamine mass ratio is 5-8 l/g, adjust the solution pH to 8-9, stirring at 20-40 degrees C for 12-24 hours, filtering, washing and drying to obtain modified multi-wall carbon nanotube lubricating oil additive C2, where the alkylamines are octylamine, decylamine, dodecylamine, tetradecylamine, hexadecylamine, and octadecylamine, (iv) adding obtained lubricating oil containing modified carbon nanomaterials A2, B2 and C2 into the lubricant, where the amount of A2, B2, and C2 accounted for 0.02-2%, 0.02-2%, and 0.01-1% of the total amount of the lubricant containing modified carbon nanomaterials, stirring and dispersing ultrasonically for 10-30 minutes, where the ultrasonic frequency is 20 kHz to obtain modified lubricant containing carbon nanomaterial.