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Preparation method of nitrogen-doped carbon quantum dot reinforced hBN nanofluid lubricant

A carbon quantum dot and nanofluid technology, applied in the field of lubrication, can solve the problems of poor lubricating performance, high size and surface energy of a single sheet, easy agglomeration and deposition of lubricating fluid, and achieve low cost, good dispersion stability, The effect of promoting energy saving, emission reduction and environmentally friendly production

Active Publication Date: 2022-02-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the interplanar spacing of lamellar hexagonal boron nitride nanoparticles is small, the size and surface energy of a single layer are usually high, and it is easy to agglomerate and deposit in lubricating fluids, resulting in poor lubricating performance

Method used

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  • Preparation method of nitrogen-doped carbon quantum dot reinforced hBN nanofluid lubricant
  • Preparation method of nitrogen-doped carbon quantum dot reinforced hBN nanofluid lubricant
  • Preparation method of nitrogen-doped carbon quantum dot reinforced hBN nanofluid lubricant

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Experimental program
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Effect test

Embodiment 1

[0025] The main components and mass fraction of embodiment 1 are as follows:

[0026]

[0027]

[0028] Add 3.0g of dopamine hydrochloride and peripheral dopamine into 100g of deionized water at a molar ratio of 1:1, then add 1.4g of sodium hydroxide, stir fully at 60°C and react for 1.5h, then add 4.3g of Concentrated nitric acid, mixed thoroughly, transferred to a high-pressure reactor, solvothermal reaction was carried out at 200 ° C for 12 hours, the product was washed with absolute ethanol and deionized water for several times, and then purified with a dialysis bag with a molecular weight cut-off of 3000 for 28 hours. The resulting solid matter was freeze-dried to obtain nitrogen-doped carbon quantum dots; then, according to the composition formula shown in the above table, 94.0g of deionized water was heated to 60°C, and nitrogen-doped carbon quantum dots were added in sequence at a speed of 800rpm. Point, hexagonal boron nitride, glycerol, triethanolamine, lauryl ...

Embodiment 2

[0031] The main components and mass fraction of embodiment 2 are as follows:

[0032] serial number component name Mass fraction / wt.% 1 Nitrogen-doped carbon quantum dots 0.4 2 Hexagonal boron nitride 1 3 Triethanolamine 2.1 Glycerol 3.5 4 Hexametaphosphate 0.8 5 Cocamidopropyl Betaine 1 6 Defoamer 0.1 7 Deionized water 90.1

[0033] Add 2.0g of dopamine hydrochloride to 100g of deionized water, then add 1.1g of sodium hydroxide, fully stir and react at 60°C for 1.5h, then add 3.5g of concentrated nitric acid to the above solution, mix well and transfer to high pressure reaction In the still, a solvothermal reaction was carried out at 220°C for 10 hours. The product was washed with absolute ethanol and deionized water for several times, and then purified with a dialysis bag with a molecular weight cut-off of 2000 for 30 hours. The obtained solid material was freeze-dried to obtain nitrogen-doped Heterog...

Embodiment 3

[0036] The main components and mass fraction of embodiment 3 are as follows:

[0037] serial number component name Mass fraction / wt.% 1 Nitrogen-doped carbon quantum dots 0.4 2 Hexagonal boron nitride 1.2 3 Triethanolamine 2 Glycerol 4 4 Hexametaphosphate 0.5 5 Lauryl dimethyl betaine 0.6 6 Cocamidopropyl Betaine 0.6 7 Defoamer 0.1 8 Deionized water 90.6

[0038] Add 4.0g of peripheral dopamine to 100g of deionized water, then add 2.0g of sodium hydroxide, fully stir and react at 60°C for 1.5h, then add 4.5g of concentrated nitric acid to the above solution, mix well and transfer to high pressure reaction In the kettle, a solvothermal reaction was carried out at 210°C for 12 hours. The product was washed with absolute ethanol and deionized water for several times and then purified with a dialysis bag with a molecular weight cut-off of 2500 for 25 hours. The obtained solid material was freeze-dried...

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Abstract

The invention provides a preparation method of a nitrogen-doped carbon quantum dot reinforced hBN nanofluid lubricant, and belongs to the technical field of lubrication, a dopamine derivative is adopted as a carbon and nitrogen source, an inorganic carbonizer and deionized water are added, and nitrogen-doped carbon quantum dots are synthesized by a solvothermal method; then the prepared nitrogen-doped carbon quantum dots are dispersed into deionized water, and hexagonal boron nitride nanoparticles, a friction modifier composition A, a betaine type surfactant composition B, an ionic dispersant composition C and a defoaming agent are are sequentially and gradually added so as to obtain the required nitrogen-doped carbon quantum dot reinforced hBN nanofluid lubricant. The preparation process is simple, reproducibility is good, cost is low, efficiency is high, and the obtained nanofluid lubricant has good dispersion stability, can effectively reduce friction force and rolling force in the process when being used for plate and strip steel hot rolling process lubrication, improves the surface quality of rolled plate and strip steel, and promotes energy conservation, emission reduction and environment-friendly production in the plate and strip steel rolling process.

Description

technical field [0001] The present invention designs a preparation method of nitrogen-doped carbon quantum dots, and its application as an additive in hexagonal boron nitride nanofluid hot-rolling lubricants, which belongs to the field of lubrication technology, and is specifically a nitrogen-doped carbon quantum dot Preparation method of enhanced hBN nanofluid lubricant. Background technique [0002] With the increasing requirements for reducing material and energy consumption and improving product surface quality in the hot rolling process of strip steel, the indispensable process lubrication technology is facing severe challenges. Traditional hot-rolling lubricating oil will cause serious environmental pollution problems, and the cost of waste liquid treatment is high, which makes it difficult to meet the environmental protection requirements of energy saving and emission reduction. In recent years, with the development and progress of nanotechnology, nanofluids with exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M125/26C10M173/02C01B32/15C10N40/24C10N30/06
CPCC10M125/26C10M173/02C01B32/15C10M2201/041C10M2201/061C10M2207/022C10M2215/042C10M2215/04C10M2215/08C10M2201/085C10N2030/06C10N2040/24C10N2040/246C10N2040/242C10N2030/64C10N2020/06C10N2010/02
Inventor 孙建林贺佳琪王成龙孟亚男黄瑛
Owner UNIV OF SCI & TECH BEIJING
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