Method for preparing graphene water-based lubricating agent in situ

An in-situ preparation and lubricant technology, which is applied in the direction of lubricating composition and petroleum industry, can solve the problems of complex preparation process, increase of interlayer friction coefficient, high preparation cost, etc., achieve simple preparation process and method, improve anti-wear and reduce Good friction performance and processing performance

Inactive Publication Date: 2015-05-06
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of application as a water-based lubricating additive, graphene oxide has the following disadvantages compared with intrinsic graphene: 1. There are a large number of oxygen-containing functional groups on the surface of graphene oxide and presents a wrinkled morphology, so that the smoothness of the surface is greatly improved. Reduced, increased coefficient of friction between layers
2. When graphene oxide dissolves in water, it will form a colloidal solution, which will greatly increase the viscosity of the lubricant, thereby reducing its operability in spray lubrication and other applications (J.Phys.Chem., 2011, 115, 3410–3415 )
3. The preparation process of graphene oxide or reduced graphene oxide is relatively complicated, the preparation cost is high, most of the chemical reagents used are harmful to the environment, and it is difficult to meet the needs of low-cost green preparation and application

Method used

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  • Method for preparing graphene water-based lubricating agent in situ
  • Method for preparing graphene water-based lubricating agent in situ
  • Method for preparing graphene water-based lubricating agent in situ

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step 1: Weigh 0.3g of surface modifier Triton X-100, add 300mL of deionized water, and vigorously stir for 12 hours to fully dissolve the surface modifier in water to obtain a solution for preparing a water-based lubricant (Triton X-100 -100 mass ratio is 0.1%);

[0042] Step 2: Take 1.5g of graphite powder (particle size less than 325 mesh) and add it to the prepared solution, stir until it is uniformly dispersed to obtain a graphite dispersion (0.5% by mass of graphite powder), and put it into a container with a cover in the Erlenmeyer flask;

[0043] Step 3: soak the Erlenmeyer flask containing the graphite dispersion in the container of the ultrasonic cavitation generating device (filled with water in advance), and perform ultrasonic cavitation treatment for 8 hours, during which the water temperature in the container is maintained by means of circulating cooling Below 40°C; the power of the ultrasonic cavitation generator is 120W, and the frequency is 40KHz;

[0...

Embodiment 2

[0048] Step 1: Weigh 0.3g of surface modifier Triton X-100, add 300mL of deionized water, and vigorously stir for 12 hours to fully dissolve the surface modifier in water to obtain a solution for preparing a water-based lubricant (Triton X-100 -100 mass ratio is 0.1%);

[0049] Step 2: Take 3g graphite powder (particle size is less than 325 orders) and add in the prepared solution, stir until it is uniformly dispersed, obtain graphite dispersion (graphite powder mass ratio 1%), and put it into a cone with a cover in a bottle;

[0050] Step 3: soak the Erlenmeyer flask containing the graphite dispersion in the container of the ultrasonic cavitation generating device (filled with water in advance), and perform ultrasonic cavitation treatment for 8 hours, during which the water temperature in the container is maintained by means of circulating cooling Below 40°C; the power of the ultrasonic cavitation generator is 120W, and the frequency is 40KHz;

[0051] Step 4: After ultraso...

Embodiment 3

[0055] Step 1: Weigh 0.3g of surface modifier Triton X-100, add 300mL of deionized water, and vigorously stir for 12 hours to fully dissolve the surface modifier in water to obtain a solution for preparing a water-based lubricant (Triton X-100 -100 mass ratio is 0.1%);

[0056] Step 2: Take by weighing 6g graphite powder (particle size is less than 325 orders) and add in the prepared solution, stir until it is evenly dispersed, obtain graphite dispersion (graphite powder mass ratio 2%), and put it into a cone with a cover in a bottle;

[0057] Step 3: soak the Erlenmeyer flask containing the graphite dispersion in the container of the ultrasonic cavitation generating device (filled with water in advance), and perform ultrasonic cavitation treatment for 8 hours, during which the water temperature in the container is maintained by means of circulating cooling Below 40°C; the power of the ultrasonic cavitation generator is 120W, and the frequency is 40KHz;

[0058] Step 4: Afte...

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Abstract

The invention discloses a method for preparing a graphene water-based lubricating agent in situ, belonging to the field of application of graphene serving as a nanometer lubricating additive. The lubricating agent consists of graphene nanoparticles, a surface modifier and purified water. The method comprises the following preparation steps: 1, dissolving a surfactant in deionized water according to a ratio, thereby obtaining a liquid; 2, uniformly dispersing graphene powder in the liquid; 3, performing ultrasonic cavitation treatment on the graphene dispersion liquid; 4, standing the liquid for a certain time, and taking the upper liquid; 5, performing centrifugal separation treatment on the obtained liquid; and 6, collecting the supernatant of the centrifuged liquid, thereby obtaining the water-based lubricating agent containing graphene prepared in situ. The method disclosed by the invention is simple in feasible, and the dispersion stability of the graphene is high. The friction test result proves that according to the extremely small addition amount (0.001-1 percent) of the graphene, the anti-wear and friction reduction properties of the lubricating agent can be greatly improved, and excellent characteristics such as good inherent cooling property, high machinability and environment friendliness of the water-based lubricating agent are not influenced.

Description

Technical field: [0001] The invention relates to a method for in-situ preparation of a graphene water-based lubricant, in particular to a technology for in-situ preparation of graphene in an aqueous solution of a surface modifier and used as a lubricant. The invention belongs to the application technical field of using graphene as a nano lubricating additive. Background technique: [0002] In the field of metal material processing industry, in order to improve efficiency and processing accuracy, improve product quality, reduce wear and friction, appropriate lubricants should be selected, which are specifically divided into two types: oil-based and water-based. Compared with the two, water-based lubricants are widely used because of their good cooling performance, suitable for high-speed processing conditions, good surface finish, and good environmental compatibility. But at the same time, due to its own poor lubricity and wear resistance, it can only be applied to occasions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M173/02C10N30/06
Inventor 沈志刚梁帅帅张晓静麻树林
Owner BEIHANG UNIV
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