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Graphene/metal oxide semiconductor (MoS2) nano self-lubricating composite material and preparation method thereof

A composite material, graphene technology, applied in the field of MoS2, to achieve the effect of simple and easy preparation method, high yield and mild reaction conditions

Inactive Publication Date: 2012-12-05
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]The structure of graphene nanosheets is similar to that of MoS2, with a typical nanosheet structure or nanolayer structure, and a high specific surface area , with a thickness between 0.34 and 10 nm. After surface modification, combined with a dispersant, it can have excellent stability and dispersibility in the base oil; in recent years, some patents for flake nano-graphite lubricating oil additives have appeared; Preparation method of nano-graphite lubricating oil additive”, patent number 200810054821.8, adding 2% flake nano-graphite lubricating oil additive to SJ15W-40 Kunlun lubricating oil; “A lubricating oil containing flake nano-graphite” , Patent No. 200410067742.2, will contain flake nano-graphite as a lubricating oil additive; patent test results show that flake nano-graphite has significantly improved wear-reducing and anti-wear effects compared with traditional graphite additives at higher loads; But so far, there is no public report on graphene nanosheets / MoS2 nanocomposites as lubricating oil additives

Method used

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  • Graphene/metal oxide semiconductor (MoS2) nano self-lubricating composite material and preparation method thereof
  • Graphene/metal oxide semiconductor (MoS2) nano self-lubricating composite material and preparation method thereof
  • Graphene/metal oxide semiconductor (MoS2) nano self-lubricating composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Preparation of graphene oxide nanosheets: Disperse 0.015 g of graphite powder into 25 mL of concentrated sulfuric acid by ice bath method, add 0.0525 g of KMnO under magnetic stirring 4 , stir evenly, when the temperature rises to 35°C, add 35 mL of deionized water, stir for 30 min, then add 15 mL of 30% H 2 o 2 , after stirring evenly, the product was collected by centrifugation and repeatedly washed with 5% HCl solution, deionized water and acetone to obtain graphite oxide nanosheets.

[0025] (2) Graphene / MoS 2 Preparation of nanocomposites: Dissolve 1.21 g of sodium molybdate in 50 mL of deionized water, add 1.08 g of sodium thiocyanate as a sulfur source and reducing agent under magnetic stirring, then add 0.5 g of sodium chloride, and stir evenly. Add 0.03 g of graphene oxide nanosheets prepared according to step 1), ultrasonically treat the above mixed solution to fully disperse the graphite oxide in the solution, and the pH value of the solution is 6, and ...

Embodiment 2

[0028] Graphene oxide nanosheets were prepared by the method of step (1) in Example 1.

[0029] Dissolve 1.21 g of ammonium molybdate in 50 mL of deionized water, add 1.08 g of sodium thiocyanate under magnetic stirring as a sulfur source and reducing agent, then add 0.5 g of sodium chloride, stir well, then add 0.03 g of For the graphene oxide nanosheets prepared in step 1) of 1, the above mixed solution was ultrasonically treated for 2 h to fully disperse the graphene oxide in the solution, and the solution was adjusted with 0.2 mol / L NaOH and 0.2 mol / L HCl The pH value was 2, and then the mixed solution was transferred into a polytetrafluoroethylene-lined hydrothermal reaction kettle, sealed and then hydrothermally reacted at 200°C for 48 h, and the product was collected by centrifugation, washed with deionized water and absolute ethanol After 3 to 5 times, dry at 80°C for 2 h, and place the dried product in N 2 / H 2 heat treatment at 800 °C for 2 h under protection, the ...

Embodiment 3

[0031] Graphene oxide nanosheets were prepared by the method of step (1) in Example 1.

[0032]Dissolve 1.21 g of sodium molybdate in 50 mL of deionized water, add 1.08 g of sodium thiocyanate under magnetic stirring as a sulfur source and reducing agent, then add 0.5 g of sodium chloride, stir well, then add 0.0152 g of Example 1 step 1) for the prepared graphene oxide nanosheets, the above mixed solution was ultrasonically treated for 2 h to fully disperse the graphene oxide in the solution, and the solution was adjusted with 0.2 mol / L NaOH and 0.2 mol / L HCl The pH value of the mixture was 2, and then the mixture was transferred to a hydrothermal reaction kettle lined with polytetrafluoroethylene, sealed and then hydrothermally reacted at 200°C for 48 h, and the product was collected by centrifugation, and deionized water and anhydrous After washing with water and ethanol for 3 to 5 times, dry at 80°C for 2 h, and put the dried product in N 2 / H 2 heat treatment at 800 °C ...

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Abstract

The invention relates to metal oxide semiconductor 2 (MoS2), in particular to a graphene / MoS2 nano self-lubricating composite material and a preparation method thereof. The composite material is prepared through the following steps that: graphene oxide nanosheets are placed into mixed solution which is formed by molybdate, sodium thiocyanate, sodium chloride and deionized water to obtain mixed solution 1, the pH value of the mixed solution 1 is adjusted through hydrogen chloride (HCl) and sodium hydroxide (NaOH) to 1 to 6, the mixed solution 1 is transferred to a hydrothermal reactor which is lined with polytetrafluoroethylene after being ultrasonically treated and uniformly mixed, the mixed solution 1 has hydrothermal reaction under 180 to 200 DEG C after the reactor is well sealed, products are centrifuged and collected after 24 to 48 hours, the products are washed by the deionized water and the absolute ethyl alcohol, and the dried products are heat treated for 2 hours under 800 to 900 DEG C under the protection of the nitrogen (N2) / hydrogen (H2) atmosphere to obtain the graphene / MoS2 nano self-lubricating composite material.

Description

technical field [0001] The present invention relates to MoS 2 , specifically, a graphene / MoS 2 Nano self-lubricating composite material and its preparation method. Background technique [0002] Friction and wear are ubiquitous in nature, and people use various methods including liquid oil lubrication and solid lubrication to reduce friction and wear; in order to improve the lubricating performance of lubricating oil, various anti-wear and anti-friction additives are usually added to the base oil; At present, there are two main categories of anti-wear additives, one is oil-soluble additives, such as oily agents containing polar groups, organometallic compounds, organic molybdenum compounds, etc.; the other is solid additives, especially graphite with a special lamellar structure. , molybdenum disulfide, tungsten disulfide, boron nitride, etc.; the effect of solid additives is directly related to the size of the particle itself, but due to process limitations, micron-sized g...

Claims

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Application Information

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IPC IPC(8): C10M125/00C10M125/22C10M125/02C10M177/00C10N30/06
Inventor 唐华胡立飞季晓瑞李长生唐国刚
Owner JIANGSU UNIV
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