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Porous ultra-thin graphene suitable for lubricating oils and preparation method and application thereof

A graphene and graphite technology, applied in the field of porous ultra-thin graphene and its preparation, can solve the problems of uneven cleavage, thick graphene thickness and small size

Inactive Publication Date: 2019-06-07
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphene prepared by redox method has many defects, and its thermal conductivity, electrical conductivity, and thermal stability are orders of magnitude different from intrinsic graphene; graphene prepared by ultrasonic stripping method has uneven thickness and small size; chemical vapor deposition Single-layer, double-layer or several-layer graphene films can be prepared by this method. This graphene film grows on the metal surface, which is expensive and has low output, and is not suitable for lubricating oil addition applications; the intercalation cleavage method currently used Most of the layering agents are strong acids or halide salts, with uneven cleavage and large differences in thickness. Usually there are many thick sheets, most of which are more than 8-10 layers; the liquid phase exfoliation method mainly uses ball milling, high-pressure homogenization, etc. The exfoliation of graphene by this method can realize the mass production of graphene, but the prepared graphene is usually thicker.
The graphene prepared by the above method has certain defects in lubricating oil additives, which is not conducive to the full performance of graphene-modified lubricating oil. Therefore, it is necessary to find a more reasonable and suitable method for preparing graphene for lubricating oil.

Method used

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  • Porous ultra-thin graphene suitable for lubricating oils and preparation method and application thereof
  • Porous ultra-thin graphene suitable for lubricating oils and preparation method and application thereof
  • Porous ultra-thin graphene suitable for lubricating oils and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Mix 1 part by mass of graphite, 1 part by mass of concentrated sulfuric acid, and 0.1 part by mass of hydrogen peroxide, heat to 30°C and stir for 1 hour to conduct weak oxidation experiments on the edge of graphite;

[0044] 2. Add 15 parts by mass of pure water. The concentrated sulfuric acid in step 1 will play a role again after being diluted by pure water in this step to promote the intercalation of water molecules. Because of the addition of concentrated sulfuric acid in step 1, no additional addition is required here For strong acid or strong base, heat the obtained mixture to 200°C in a closed manner, and control the pressure below 10 MPa through a pressure reducing valve, and react for 24 hours to conduct water molecule intercalation experiments;

[0045] 3. Wash the obtained mixture to neutrality, then freeze it in the refrigerator at -20°C for more than 5 hours, and then vacuum-dry the obtained mixture until the surface is dry, and the water-intercalated gr...

Embodiment 2

[0049] 1. Mix 1 part by mass of graphite with 2 parts by mass of hydrogen peroxide, heat to 30°C and stir for 1 hour to conduct a weak oxidation experiment on the edge of the graphite. After oxidation, wash and dry the remaining hydrogen peroxide in the system; here is the reason for washing and drying the hydrogen peroxide The reason is that the hydrogen peroxide content in this system is relatively high, if it is not washed and dried, there will be a risk of explosion.

[0050] 2. Add a dilute phosphoric acid solution with a pH of less than 1 (adjust the concentration of phosphoric acid by controlling the pH), heat the resulting mixture to 200°C in a closed manner, and control the pressure below 10 MPa through a pressure reducing valve, and react for 24 hours. Intercalation experiment.

[0051] After the successful intercalation of water molecules, steps 3-5 are exactly the same as in Example 1, and the prepared graphene scanning electron microscope is as follows figure 2 ...

Embodiment 3

[0053] Only in the weak oxidation process, graphite powder is pressed into a block with a certain mechanical strength as an electrode, which is connected to the positive electrode of the power supply, and the platinum electrode is used as the counter electrode, and the platinum electrode is connected to the negative electrode of the power supply, and the two electrodes are placed in dilute sulfuric acid aqueous solution. The voltage is 1V, react until the graphite electrodes all fall off, then wash the fallen graphite and dry it. Continue to follow-up steps 2-5, and the remaining follow-up steps 2-5 are the same as in embodiment 2.

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Abstract

The invention embodiment relates to a porous ultra-thin graphene suitable for lubricating oils and a preparation method and application thereof. The preparation method comprises the following steps: opening graphite edges by a weak oxidation or halogenation manner; inserting water molecules into the graphite subjected to weak oxidation or halogenation to obtain a water intercalated graphite; washing and drying the water intercalated graphite; performing microwave treatment on the dried water intercalated graphite, performing ultrasonic dispersion in a solvent, and performing drying after ultrasound dispersion. The graphene prepared by the method has a layer number fewer than four layers, the size distribution is uniform, the interior of the graphene surface has no defects, the graphene edges are suitable for grafting long carbon chains, and the grafted graphene is suitable for being added in the lubricating oils to improve lubricating oil performances.

Description

technical field [0001] The invention relates to the field of graphene materials, in particular to a porous ultra-thin graphene suitable for lubricating oil and its preparation method and application. Background technique [0002] Graphene can form a friction adsorption film and a dual transfer film at the friction interface. Its excellent mechanical properties and chemical inertness can inhibit direct contact and wear with the frictional dual surface, thereby significantly improving the bearing capacity of the lubricant and the wear resistance of the friction pair. . In addition, the high thermal conductivity of graphene can also improve the cooling performance of lubricating oil. At present, there have been some attempts to apply graphene as a lubricating oil additive, but from the effect point of view, it is not very ideal, mainly because the graphene used is not suitable for lubricating oil applications. [0003] At present, there are many methods for preparing graphene...

Claims

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Application Information

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IPC IPC(8): C01B32/19C10M125/02C10N30/06
Inventor 郭玉芬刘朝军张慧涛黄满华刘兆平
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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