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Nano-molybdenum disulfide magnetic lubricant and preparation method thereof

A kind of ene lubricant and nano technology, applied in the field of nano-molybdenum disulfide magnetic lubricant, can solve the problems that magnetic lubricants have not yet been reported in literature and patents, increase the cost of lubricant use, and have no magnetic properties of nanoparticles, so as to achieve good dispersion Effect, increase product yield, prevent agglomeration effect

Active Publication Date: 2015-11-25
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is worth mentioning that due to the magnetic properties of nano-magnetic lubricant particles, they are easier to agglomerate than ordinary nanoparticles, so a large amount of surfactant needs to be added for dispersion [Wu Lei, Liu Yongkun, Li Xuehui, Preparation of Nano-magnetic Lubricant, Lubrication and Sealing, 2011, 36(3):94-96], the use of these surfactants increases the use cost of the lubricant on the one hand, and on the other hand, in the late stage of friction, due to the frictional damage of the surfactants, resulting in The rapid aggregation of nano-magnetic lubricant particles greatly affects the lubrication stability. Therefore, it is urgent to develop a new nano-magnetic lubricant
[0003] In recent years, inorganic fullerene-like molybdenum disulfide (IF-MoS) with a particle size of tens to hundreds of nanometers 2 ) has a good lubricating effect and has been widely concerned by researchers, but it is also greatly limited due to the short lubrication time. Therefore, the IF-MoS 2 Preparation as a magnetic lubricant is an important method to accelerate its application
Chinese patent [Publication No. CN104762122A] discloses a graphene-like fullerene molybdenum disulfide composite lubricating oil additive and a preparation method thereof, but this nanoparticle is not magnetic, although there are also related magnetic particles Fe 3 o 4 MoS 2 Reported by [LinT, WangJ, GuoL, et al.Fe 3 o 4 MoS 2 Core-Shell Composites: Preparation, Characterization and Catalytic Application. The Journal of Physical Chemistry C, 2015, 119, 13658-13664], but it is mainly used as a catalyst. Due to different functions, there will be significant differences in the composition, structure, composition ratio, and preparation methods of materials. So far So far, based on IF-MoS 2 Magnetic lubricants have not yet been reported in literature and patents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1 part of Fe with a particle size of 15nm 3 o 4 Add 1000 parts of an aqueous solution containing 0.002% graphene oxide, ultrasonically disperse at 50°C for 40 minutes; maintain a constant temperature and ultrasonic state, add 0.2 parts of EDTA-2Na, 2 parts of sodium sulfide, 20 parts of ammonium molybdate, and 0.2 parts of oxalic acid to the solution in sequence Sodium, adjust the pH of the solution to 7, move the solution to a pressure-resistant reactor, and keep it warm for 1 hour at a temperature of 165°C; then adjust the pH to 9, lower the temperature to 90°C, add 0.02 parts of sodium borohydride, and keep it warm 2h; After cooling, the solution was centrifuged to obtain a black solid, which was rinsed with deionized water and dried to obtain a lubricant precursor; the lubricant precursor was placed in a tube furnace, purged with high-purity nitrogen, and the air velocity was 0.05m / s, at the same time, the temperature of the system is raised to 400°C for 20 minute...

Embodiment 2

[0018] 1 part of Fe with a particle size of 20nm 3 o 4 Add 1000 parts of an aqueous solution containing 0.02% graphene oxide, ultrasonically disperse at 40°C for 30 minutes; maintain a constant temperature and ultrasonic state, add 0.2 parts of EDTA-2Na, 10 parts of sodium sulfide, 60 parts of ammonium molybdate, and 0.8 parts of oxalic acid to the solution in sequence Sodium, adjust the pH of the solution to 7, move the solution to a pressure-resistant reactor, and keep it warm for 1 hour at a temperature of 180°C; then adjust the pH to 9.5, lower the temperature to 90°C, add 0.1 parts of sodium borohydride, and keep it warm 2.5h; after cooling, the solution was centrifuged to obtain a black solid, which was rinsed with deionized water and dried to obtain a lubricant precursor; the lubricant precursor was placed in a tube furnace, purged with high-purity nitrogen, and the air velocity was 0.05 m / s, at the same time, raise the temperature of the system to 450°C for 10 minutes...

Embodiment 3

[0020] 1 part of Fe with a particle size of 30nm 3 o 4 Add 1000 parts of an aqueous solution containing 0.05% graphene oxide, ultrasonically disperse at 30°C for 30 minutes; maintain a constant temperature and ultrasonic state, add 0.3 parts of EDTA-2Na, 30 parts of sodium sulfide, 90 parts of ammonium molybdate, and 1 part of oxalic acid to the solution in sequence Sodium, adjust the pH of the solution to 7, move the solution to a pressure-resistant reactor, and keep it warm for 2 hours at a temperature of 180°C; then adjust the pH to 10, lower the temperature to 100°C, add 0.2 parts of sodium borohydride, and keep it warm 3h; after cooling, the solution was centrifuged to obtain a black solid, which was rinsed with deionized water and dried to obtain a lubricant precursor; the lubricant precursor was placed in a tube furnace, purged with high-purity nitrogen, and the air velocity was 1m / s, at the same time, raise the temperature of the system to 500 ° C for 20 min, then ra...

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Abstract

The invention discloses a nano-molybdenum disulfide magnetic lubricant and a preparation method thereof, and particularly relates to a nano-Fe3O4@IF-MoS2-graphene. In the lubricant, the mass ratio of Fe3O4 to IF-MoS2 to graphene is 1:(2-20):(0.02-0.5), furthermore, each component is of a specific size and structure. The preparation method comprises the following steps: firstly, dispersing nano-Fe3O4 to the surface of graphene oxide; and then, in-situ synthesizing an MoS3 precursor outside Fe3O4, and reducing and desulfurizing to obtain the nano-molybdenum disulfide magnetic lubricant. The prepared lubricant product has the advantages of high yield, good purity, good dispersion, excellent magnetism and excellent lubricity, and has important application values in the fields of precision machinery lubrication, long-term lubrication and the like.

Description

1. Field of invention [0001] The invention relates to the field of a nano-molybdenum disulfide magnetic lubricant, in particular to a nano-Fe 3 o 4 IF-MoS 2 -Graphene lubricant and preparation method thereof. 2. Background technology [0002] The size of solid lubricant particles has a great influence on its performance. Compared with traditional lubricants, nano-lubricant has smaller particle size and is closer to the thickness of liquid lubricating film, except for friction shear or tribochemical reaction to form lubrication Outside the film, it can also play the ball effect of the micro-bearing, so it often shows better lubricating performance. However, under the action of mechanical friction, these lubricant nanoparticles quickly fall off from the friction interface and cannot be maintained for a long time, thus affecting the exertion of its advantages. Nano-magnetic lubricants can be effectively enriched in the friction interface under the action of an external magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M125/00B82Y30/00B82Y40/00C10N30/06
Inventor 徐玉福郑晓静姚路路刘志成胡献国
Owner HEFEI UNIV OF TECH
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