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Lubricating oil containing surface-modified carbon nanomaterials and preparation method thereof

A carbon nanomaterial and surface modification technology, applied in lubricating compositions, petroleum industry, additives, etc., can solve the problem that the porous structure of the interface protective film cannot be maintained, the linear carbon nanotubes are easily entangled into clusters, and the graphene surface is inert. and other problems, to achieve the effect of improving bifunctional lubrication, improving mutual solubility and solving stability

Active Publication Date: 2020-07-10
HEILONGJIANG HUASHENG GRAPHITE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] Although the application of graphene in the field of lubricating oil has excellent performance as mentioned above, the problems existing in the application of carbon nanomaterials such as graphene in the field of lubricating oil are also very obvious, and urgently need to be solved
[0021] The surface of graphene is highly inert, and the interaction with lubricating base oil molecules is weak, resulting in poor dispersion stability. In addition, there is a strong van der Waals force between graphene sheets, which makes graphene easy to agglomerate on the one hand. On the other hand, under the action of friction interface extrusion, it is easy to form a dense film, which cannot maintain the porous structure of the interface protective film.
Combining sheet-structure graphene with linear carbon nanotubes can reduce the stacking and compaction of graphene, but linear carbon nanotubes are easily entangled into clusters, and the problem of uniform dispersion in lubricating oil is difficult to solve

Method used

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  • Lubricating oil containing surface-modified carbon nanomaterials and preparation method thereof
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  • Lubricating oil containing surface-modified carbon nanomaterials and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0070] Step 1: Preparation of modified graphene nanomaterials

[0071] According to the mass ratio of 6:1-2:1, the number of layers is 1-10 layers, and the graphene and dopamine hydrochloride with a sheet size of 20-1000nm are added to a concentration of 0.01-0.10mol / L Tris. In the aqueous solution, the volume ratio of the aqueous solution of Tris to dopamine hydrochloride mass ratio is 3-5L / g; Adjust the pH value of the solution to be 8-9, ultrasonic shearing is processed until dopamine hydrochloride is completely dissolved, and graphene is fully dispersed; Add hydrogen peroxide according to the ratio of 30-50mL5% hydrogen peroxide per gram of dopamine, stir at 20-40°C for 1-10h, filter, wash and dry to obtain graphene nanomaterial A1 coated with polydopamine;

[0072]Add A1 and alkylamine to the ethanol solution of trishydroxymethylaminomethane with a concentration of 0.01-0.10mol / L according to the mass ratio of 1:4, and the solvent in the ethanol solution has a mass conc...

Embodiment 2

[0083] This embodiment is basically the same as Embodiment 1, the difference is:

[0084] The graphene layer number described in step 1 is 1-10 layers, sheet size 20-1000nm, most preferably 1-3 layers, sheet size 50-150nm; Described graphene and dopamine hydrochloride mass ratio are 6:1-2 : 1, the preferred mass ratio is 5: 1; the 20-40 ° C stirring 1-10h, preferably 1-2h;

[0085] Step 2: The carbon nanotubes are multi-walled carbon nanotubes with a purity greater than 95%, a diameter of 8-30nm, and a length of 0.5-15μm; the most preferred purity is greater than 99.5%, 10-20nm, and a length of 0.5-5μm; the carbon The mass ratio of nanotubes to dopamine hydrochloride is 6:1-2:1, preferably 5:1; stirring at 20-40°C for 1-10h, preferably 1-2h;

[0086] Step 3: The carbon nanofiber has a diameter of 50-200nm and a length of 1-20μm, most preferably a diameter of 50-100nm and a length of 5-10μm; the mass ratio of the carbon nanofiber to dopamine hydrochloride is 6:1-2:1, prefera...

Embodiment 3

[0094] The present embodiment is basically the same as Example 1, except that in step 1, the number of layers is 1-6 layers, and the graphene and dopamine hydrochloride of sheet size 100-200nm are added to the ratio of 2:1 according to the mass ratio. Concentration is in the aqueous solution of 0.01mol / L tris, the volume of the aqueous solution of tris and the dopamine hydrochloride mass ratio are 4L / g; At 8000 rpm, emulsify for 2 minutes, and then ultrasonically treat at a frequency of 20KHz until dopamine hydrochloride is completely dissolved and graphene is fully dispersed; add hydrogen peroxide at a rate of 40mL of 5% hydrogen peroxide per gram of dopamine hydrochloride, and react at 20-40°C 1-2h.

[0095] figure 1 It is the transparent radio microscope photograph of the graphene after embodiment 3 step 1 surface treatment. like figure 1 As shown, the graphene sheet size is about 100-200, and the thickness of the modified material increases, indicating that the surfac...

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Abstract

The invention relates to lubricating oil containing surface modified carbon nanomaterials and a preparation method thereof, in particular to lubricating oil containing graphene, carbon nanotubes and nanocarbon fibers and a preparation method thereof. Graphene, carbon nanotubes and carbon nanofibers are coated with polydopamine and grafted with long-carbon-chain paraffins correspondingly on surfaceto obtain corresponding modified carbon nanomaterials. The modified carbon nanomaterials, base oil, and other lubricant functional additives are mixed in proportion to obtain the lubricating oil containing the surface modified carbon nanomaterials. The lubricating oil containing the surface modified carbon nanomaterials and the preparation method thereof solve problems of stability and dispersibility, produces ball effects and supporting effects, and further produce a solid-liquid dual-function lubrication mechanism and a stable porous structure, and remarkably improve performance of the lubricating oil.

Description

technical field [0001] The invention relates to a modified lubricating oil and a preparation method thereof, in particular to a lubricating oil containing graphene, carbon nanotubes and nano-carbon fibers and a preparation method thereof. Background technique [0002] Research status of lubricating oil [0003] Despite the continuous improvement of lubricating properties such as engine oil, an average of 15% of the fuel consumption of each car is still spent on overcoming the frictional resistance of the engine and gearbox. Friction and wear are the main causes of engine inefficiency. Friction also shortens the service life of the engine and increases the emission of harmful components in the exhaust gas. On the one hand, lubricating oil can keep the engine in good working condition, and on the other hand, it can prolong the service life of moving parts such as the engine by reducing friction and wear, so it can help the energy saving and emission reduction of automobiles ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M125/02C10M177/00C10N30/04C10N30/06C10N40/25
CPCC10M125/02C10M177/00C10M2201/041C10M2201/14C10N2030/04C10N2030/06C10N2030/54C10N2030/78C10N2040/25C10N2060/09C10N2020/061C10N2020/06
Inventor 曹殿学
Owner HEILONGJIANG HUASHENG GRAPHITE CO LTD
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