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Lubricant additive based on surface modified oxidized graphene, lubricant based on surface modified oxidized graphene, and preparation methods of lubricant additive and lubricant

A lubricating oil additive and surface modification technology, applied in the field of lubricating oil, can solve the problems of easy stratification and precipitation, and achieve the effect of high repetition rate, avoidance of addition and good dispersibility

Inactive Publication Date: 2017-01-25
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, graphene oxide is both hydrophilic and lipophilic, so graphene oxide additives are prone to stratification and precipitation during use. How to give full play to the effectiveness of graphene oxide and overcome the above defects is the key to developing lubricants based on graphene oxide materials. Difficulties that additives must face

Method used

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  • Lubricant additive based on surface modified oxidized graphene, lubricant based on surface modified oxidized graphene, and preparation methods of lubricant additive and lubricant
  • Lubricant additive based on surface modified oxidized graphene, lubricant based on surface modified oxidized graphene, and preparation methods of lubricant additive and lubricant
  • Lubricant additive based on surface modified oxidized graphene, lubricant based on surface modified oxidized graphene, and preparation methods of lubricant additive and lubricant

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preparation example Construction

[0029] The invention also discloses a method for preparing a lubricating oil additive based on surface-modified graphene oxide, comprising the following steps:

[0030] Prepare graphite oxide and disperse it in an organic solvent to prepare a graphene oxide solution;

[0031] The aqueous solvent of bile salt or its derivatives is added to the prepared graphene oxide solution, and the reducing agent is added dropwise, and the target product is obtained after reaction.

[0032] or

[0033] Prepare graphene oxide and disperse it in water to prepare graphene oxide dilute solution;

[0034] The water solvent of bile salt or its derivatives is added to the prepared dilute graphene oxide solution, the temperature is raised to 60-80° C., and the target product is obtained after reaction.

[0035] Wherein, the organic solvent may be toluene, xylene, cyclohexane and the like.

[0036] Wherein, the obtained surface-modified graphene oxide has a thickness of 0.17-1.4 nm, and a sheet di...

Embodiment 1

[0047]Preparation of graphite oxide: Using the Hummer method, add 2g flake graphite powder to a 250mL beaker, add 1g NaNO to it under the condition of ice water bath 3 After adding 46 mL of 98% H 2 SO 4 And stir well; slowly add 6g KMnO 4 , keep the temperature of the solution above 20°C and maintain this condition for 5 minutes, then remove the ice-water bath and heat to 35°C, and maintain this condition for 30 minutes; add 92mL of water and stir for another 15 minutes, the temperature will rise to about 98°C Continue to add 80 mL of 60°C 3% hydrogen peroxide, centrifuge the liquid after the above treatment for 30 minutes at 7200 rpm with a centrifuge; wash the residue with hot water until the pH of the upper suspension is about 7; disperse the obtained powder in Sonicate in water for 15 minutes, and obtain a uniform suspension after filtering the black residue; freeze-dry the suspension to obtain graphite oxide.

[0048] Preparation of graphene surface-treated with sodium...

Embodiment 2

[0051] The preparation method is the same as that in Example 1, except that 5.3 g of an aqueous solution of sodium deoxycholate with a concentration of 0.25 mol / L is added, the temperature is raised to 80° C., heated to reflux, and graphene oxide surface-treated with sodium deoxycholate is prepared by a two-phase method. , washed, filtered and dried to obtain a graphene oxide powder surface-treated with sodium deoxycholate.

[0052] 0.50% by mass percentage of sodium deoxycholate surface-treated graphene powder is added to the lubricating oil, stirred and mixed evenly.

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Abstract

The invention discloses a lubricant additive based on a surface modified oxidized graphene. The lubricant additive comprises oxidized graphene, the surface of the oxidized graphene is treated by a bile salt or a derivative of the bile salt, and the mass percentage of the oxidized graphene in a lubricant is 0.01-0.9%. The invention further provides the lubricant based on the modified oxidized graphene and preparation methods of the lubricant additive and the lubricant. The method is simple and practicable, is high in repetitive rate, and is suitable for large-scale industrial production. The lubricant additive has an excellent dispersing property, effectively improves the abrasion resistance property of the lubricant, and reduces the loss of an engine.

Description

technical field [0001] The invention relates to the field of lubricating oil, in particular to a lubricating oil additive based on surface-modified graphene oxide, lubricating oil and a preparation method thereof. Background technique [0002] The lubricating performance of the engine is closely related to the safety, environmental protection and energy-saving performance of the car. With the continuous improvement of the engine performance, the requirements for lubrication are becoming more and more complex and demanding. In order to improve the lubricating performance of the engine, achieve wear reduction and energy saving, and improve mechanical efficiency. Oil additives also came into being. How to choose suitable nanoparticles as additives and improve their dispersibility has become a research hotspot in the field of lubricating oil additives in recent years. [0003] As a new carbonaceous material with a two-dimensional structure, graphene oxide has a series of excell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M125/02C09C3/08C09C1/46C10N30/06C10N30/04C10N40/25
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