Nanodiamonds having acid functional group and method for producing same
US-2017240429-A1 · Aug 24, 2017 · US
Water lubricant composition and water lubricating system
US10844313B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10844313-B2 |
| Application number | US-201716301932-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 21, 2017 |
| Priority date | May 16, 2016 |
| Publication date | Nov 24, 2020 |
| Grant date | Nov 24, 2020 |
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Abstract
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A water lubricant composition (10) of the present invention contains water (11) as a lubricating base material and ND particles (12), which are hydrogen-reduced nanodiamond particles. The content of the water (11) in the water lubricant composition (10) is, for example, 90% by mass or more. The content of the ND particles (12) in the water lubricant composition (10) is, for example, 0.1% by mass or less. The water lubricant composition (10) is suitable for achieving low friction in water lubrication. A water lubricating system of the present invention includes the water lubricant composition (10) which is being used for the lubrication of a SiC member and/or a SiO2 member.
First claim
Opening claim text (preview).
The invention claimed is: 1. A water lubricant composition comprising: water as a lubricating base material; and hydrogen-reduced nanodiamond particles, wherein the hydrogen-reduced nanodiamond particles are present in a content of 0.1% by mass or less, wherein the hydrogen-reduced nanodiamond particles are present in a content of 0.5 ppm by mass or more, wherein the hydrogen-reduced nanodiamond particles have a positive zeta potential, and wherein the zeta potential is measured by Doppler electrophoresis at a measurement temperature of 25° C. 2. The water lubricant composition according to claim 1 , wherein the hydrogen-reduced nanodiamond particles are present in a content of 0.01% by mass or less. 3. The water lubricant composition according to claim 1 , wherein the hydrogen-reduced nanodiamond particles are present in a content of 50 ppm by mass or less. 4. The water lubricant composition according to claim 1 , wherein the hydrogen-reduced nanodiamond particles are present in a content of 20 ppm by mass or less. 5. The water lubricant composition according to claim 1 , wherein the water is present in a content of 90% by mass or more. 6. The water lubricant composition according to claim 1 , wherein the hydrogen-reduced nanodiamond particles are hydrogen reduction-treated products of detonation nanodiamond particles. 7. The water lubricant composition according to claim 1 , wherein the hydrogen-reduced nanodiamond particles have a median diameter of 9 nm or less, and wherein the median diameter is measured by dynamic light scattering technique using a noncontact backscatter mode. 8. The water lubricant composition according to claim 1 , wherein an oxygen content of the hydrogen-reduced nanodiamond particles is 10% by mass or less. 9. A water lubricating system comprising: the water lubricant composition according to claim 1 being used for lubrication of a SiC member and/or a SiO 2 member.
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Classifications
Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title
- C10M173/02Primary
not containing mineral or fatty oils · CPC title
Carbon; Graphite; Carbon black · CPC title
Particles of special shape or size · CPC title
Dispersions of solid lubricants · CPC title
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- What does patent US10844313B2 cover?
- A water lubricant composition (10) of the present invention contains water (11) as a lubricating base material and ND particles (12), which are hydrogen-reduced nanodiamond particles. The content of the water (11) in the water lubricant composition (10) is, for example, 90% by mass or more. The content of the ND particles (12) in the water lubricant composition (10) is, for example, 0.1% by mas…
- Who is the assignee on this patent?
- Daicel Corp, Univ Tohoku
- What technology area does this patent fall under?
- Primary CPC classification C10M173/02. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 24 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).