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A kind of graphene-based lubricating grease and preparation method thereof

A technology of olefin grease and grease, which is applied in the field of preparation of nano-materials, can solve the problems of high production process cost, high energy consumption, complex process, etc., achieve dispersion without impurities and agglomeration, reduce friction and wear, and reduce cost loss Effect

Active Publication Date: 2022-04-01
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, electrochemical or ultrasonic probe-assisted stripping still has defects such as high energy consumption and complicated process, which cannot meet the needs of mass production in practical applications.
On the other hand, the use of highly polluting organic intercalants will destroy the structure of the nanosheets and bring problems such as high cost to the production process.

Method used

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  • A kind of graphene-based lubricating grease and preparation method thereof
  • A kind of graphene-based lubricating grease and preparation method thereof
  • A kind of graphene-based lubricating grease and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The present invention is a kind of preparation method of high-performance, low-cost graphene-based lubricating grease, realizes through following steps:

[0029] (1) Pulverize the bulk graphite and screen out the powder below 5 μm, weigh the graphite powder 1×10 -2 kg dissolved in 500ml deionized water, add 2×10 -2 kg sodium hydroxide and magnetic stirring to make it evenly mixed. Subsequently, the suspension was transferred to a 1L autoclave, and heat-treated at 200 °C at 30 rpm / min for 2 h. Next, the intermediate product after hydrothermal treatment was transferred to a constant temperature shaker and sonicated at 330W for 2h. Then, after the intermediate product was dried, citric acid was added and the temperature was raised to 650°C in a tube furnace, and the temperature was kept constant for 1h. Finally, the product was collected, neutralized, centrifuged at 2500 rpm / min for 10 min, washed, filtered and dried to obtain graphene nanosheets. figure 1 The graphene...

Embodiment 2

[0033] (1) Pulverize the bulk graphite and screen out the powder below 5 μm, weigh the graphite powder 1×10 -2 kg dissolved in 500ml deionized water, add 3×10 -2 kg sodium hydroxide and magnetic stirring to make it evenly mixed. Subsequently, the suspension was transferred to a 1 L autoclave and heated at 200 °C at 30 rpm / min for 2 h. Next, the intermediate product after hydrothermal treatment was transferred to a constant temperature shaker and sonicated at 330W for 2h. Then, after the intermediate product was dried, citric acid was added and the temperature was raised to 650°C in a tube furnace, and the temperature was kept constant for 1h. Finally, the product was collected, neutralized, centrifuged at 2500 rpm / min for 10 min, washed, filtered and dried to obtain graphene nanosheets.

[0034] (2) The dried product is weighed 5×10 according to the addition amount of 0.5wt.%. -5 kg dispersed in absolute ethanol and ultrasonically obtained a uniform graphene dispersion; un...

Embodiment 3

[0037] (1) Pulverize the bulk graphite and screen out the powder below 5 μm, weigh the graphite powder 1×10 -2 kg dissolved in 500ml deionized water, add 4×10 -2 kg sodium hydroxide and magnetic stirring to make it evenly mixed. Subsequently, the suspension was transferred to a 1 L autoclave and heated at 200 °C at 30 rpm / min for 2 h. Next, the intermediate product after hydrothermal treatment was transferred to a constant temperature shaker and sonicated at 330W for 2h. Then, after the intermediate product was dried, citric acid was added and the temperature was raised to 650°C in a tube furnace, and the temperature was kept constant for 1h. Finally, the product was collected, neutralized, centrifuged at 2500 rpm / min for 10 min, washed, filtered and dried to obtain graphene nanosheets.

[0038] (2) The dried product is weighed 5×10 according to the addition amount of 0.5wt.%. -5 kg dispersed in absolute ethanol and ultrasonically obtained a uniform graphene dispersion; un...

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Abstract

The invention discloses a preparation method of graphene-based lubricating grease. The alkali metal hydroxide is used as an intercalating agent, mixed with graphite powder and dissolved in water to obtain a suspension; the suspension is placed in a homogeneous reactor. heat treatment at a constant temperature; the suspension after the heat treatment is ultrasonically treated and dried; a saturated expansion agent is added to the obtained product, and a tubular furnace is used for thermal expansion at high temperature, and finally the product is washed, centrifuged, filtered and dried to obtain graphene nanosheets ; Disperse the graphene nanosheets in absolute ethanol and ultrasonically obtain a uniform graphene dispersion; under mechanical stirring, the dispersion is added dropwise to the hot grease, and after cooling, it is repeatedly ground to mixed uniformly to obtain a graphene base grease. The graphene lubricating grease prepared by the method is evenly dispersed without impurities and agglomeration, and can effectively reduce the friction and wear of the reciprocating motion of the ball plate.

Description

technical field [0001] The invention relates to the technical field of preparation of nanometer materials, in particular to a lubricating grease and a preparation method thereof. Background technique [0002] As the core component of lubricants, the traditional anti-oxidant and anti-corrosion additives are represented by zinc dialkyldithiophosphate (ZDDP), whose technology has been monopolized by other countries for a long time. With the enforcement of relevant specifications and laws and regulations, ZDDP containing harmful elements such as phosphorus and sulfur are subject to increasingly strict restrictions on use. Therefore, in order to meet the anti-oxidation and anti-wear properties while reducing the emission of toxic and harmful elements and increasing the environmental sustainability of lubricants, the focus of many studies has shifted to 2D nanomaterials. As a 2D nanomaterial without any harmful elements, graphene connected by weak van der Waals force between adja...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M125/02C10M177/00C01B32/19C10N30/06C10N30/04
CPCC10M125/02C10M177/00C01B32/19C01B2204/04C01B2204/32C10M2201/041
Inventor 程志林孔颖超刘赞
Owner YANGZHOU UNIV
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