Lubricant and lubrication composition

Patent metadata

Field	Value
Publication number	US-11718809-B2
Application number	US-202017777543-A
Country	US
Kind code	B2
Filing date	Dec 7, 2020
Priority date	Dec 9, 2019
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

The present invention relates to a lubricant containing molybdenum sulfide particles, and the molybdenum sulfide particles contain molybdenum disulfide having a 3R crystal structure. The present invention relates to a lubricating composition containing molybdenum sulfide particles, which are the lubricant, and a base oil which is a mineral oil, a synthetic oil, or a partially synthetic oil.

First claim

The invention claimed is:

1. A lubricant comprising molybdenum sulfide particles, wherein
the molybdenum sulfide particles contain molybdenum disulfide having a 2H crystal structure and a 3R crystal structure,
the molybdenum sulfide particles have a specific surface area of 10 m 2 /g or more, the specific surface area being measured by a BET method, and
in a spectrum of the molybdenum sulfide particles obtained from powder X-ray diffraction (XRD) using Cu-Kα rays as an X-ray source, both a peak in a vicinity of 39.5° and a peak in a vicinity of 49.5° include a synthetic peak of the 2H crystal structure and the 3R crystal structure, and a half width of the peak in the vicinity of 39.5° and a half width of the peak in the vicinity of 49.5° is 1° or more.

2. The lubricant according to claim 1 , wherein
the specific surface area of the molybdenum sulfide particles is 30 m 2 /g to 300 m 2 /g, the specific surface area being measured by a BET method.

3. The lubricant according to claim 1 , wherein
the molybdenum sulfide particles have a median diameter D 50 of 10 nm to 1,000 nm, the median diameter D 50 being determined by a dynamic light scattering type particle diameter distribution measuring device.

4. The lubricant according to claim 1 , wherein
in a radial distribution function of the molybdenum sulfide particles obtained from an extended X-ray absorption fine structure (EXAFS) spectrum of a K absorption edge of molybdenum, a ratio (I/II) of peak intensity I caused by Mo—S to peak intensity II caused by Mo—Mo is more than 1.0.

5. A lubricating composition comprising:
molybdenum sulfide particles which are the lubricant according to claim 1 ; and
a base oil which is a mineral oil, a synthetic oil, or a partially synthetic oil.

6. The lubricating composition according to claim 5 , wherein
the molybdenum sulfide particles, which are the lubricant, are contained in an amount of 0.0001% by mass to 50% by mass with respect to 100% by mass of the total mass of the lubricating composition.

Assignees

• Dainippon Ink & Chemicals

Inventors

• Kano Yusuke
• Oki Hironobu
• Dohi Tomoki
• Yuan Jianjun

Classifications

• C10M103/06 Primary

  Metal compounds · CPC title

• C10M125/22 Primary

  Compounds containing sulfur, selenium or tellurium · CPC title

• C10M2201/066

  Molybdenum sulfide · CPC title

• C10M2201/0663

  used as base material · CPC title

• C10M2203/003

  used as base material · CPC title