Lubricant and additive formulation

• US 20050124504A1
• Filed: 08/10/2004
• Published: 06/09/2005
• Est. Priority Date: 07/26/2002
• Status: Abandoned Application

• Current Assignee: Ashland Licensing and Intellectual Property Llc
• Original Assignee: Ashland Incorporated (Bank of Montreal)
• Inventors: Zhang, Zhigiang, Baumgart, Richard J., Lockwood, Frances E., Wu, Gefei, Smith, Thomas R., Dituro, Michael A.
• Application Number:
  US10/915,251
• Publication Number:
  US 20050124504A1
• Time in Patent Office: Days
• US Class Current: 508/128
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C10M 125/02 Carbon; Graphite
• CPC Class Codes: C10M 161/00 Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
• CPC Class Codes: C10M 169/044 the additives being a mixture of non-macromolecular and macromolecular compounds
• CPC Class Codes: C10M 2201/041 Carbon; Graphite; Carbon black
• CPC Class Codes: C10M 2215/064 Di- and triaryl amines
• CPC Class Codes: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10M 2227/061 Esters derived from boron
• CPC Class Codes: C10N 2010/12 Groups 6 or 16
• CPC Class Codes: C10N 2020/06 Particles of special shape or size
• CPC Class Codes: C10N 2030/02 Pour-point; Viscosity index
• CPC Class Codes: C10N 2040/25 Internal-combustion engines

Abstract

A lubricant composition for use as a concentrate and motor oil having an enhanced thermal conductivity. One preferred composition contains a lubricant composition, nanomaterial, and a dispersing agent or surfactant for the purpose of stabilizing the nanomaterial. One preferred nanomaterial is a high thermal conductivity graphite, exceeding 80 W/m in thermal conductivity. Carbon nano material or nanostructures such as nanotubes, nanofibrils, and nanoparticles formed by grounding and/or milling graphite to obtain a mean particle size less than 500 nm in diameter, and preferably less than 100 nm, and most preferably less than 50 nm. Other high thermal conductivity carbon materials are also acceptable. To confer long-term stability, the use of one or more chemical dispersants or surfactants is useful. The graphite nanomaterials contribute to the overall fluid viscosity and providing a very high viscosity index. Particle size and dispersing chemistry is controlled to get the desired combination of viscosity and thermal conductivity increase from the lubricant. The resulting fluids have unique properties due to the high thermal conductivity and high viscosity index of the suspended particles, as well as their small size.

Claims

1. An engine oil lubricant concentrate used in combination with a crankcase lubricant for dilution with a mineral oil, a synthetic oil, a semi-synthetic severely hydro cracked oil, and combinations thereof, said lubricant concentrate comprising:

from 0.05 weight percent to 5.0 weight percent of an oil soluble molybdenum additive;

from 10.0 volume percent to 95 volume percent of a base oil comprising selected from the group consisting of a synthetic base oil, a mineral oil, a severely hydro cracked oil, alone and in combination one with another;

from 0.5 volume percent to 35.0 volume percent of a dispersant inhibitor containing zinc dithiophosphate;

from 0.5 weight percent to 25.0 weight percent of a viscosity index improver;

an effective amount of nano structures; and

an effective amount of a boron compound containing an effective amount of less than 1000 ppm of an elemental boron.

2. An engine oil lubricant concentrate used in combination with a conventional crankcase lubricant comprising a mineral oil, a synthetic oil, a semi-synthetic severely hydro cracked oil, and combinations thereof, said lubricant concentrate comprising:

from 0.05 weight percent to 5.0 weight percent of an oil soluble molybdenum additive;

from 10.0 volume percent to 95 volume percent of a synthetic base oil, a mineral oil, a severely hydro cracked oil, and combinations thereof;

from 0.5 volume percent to 35.0 volume percent of a dispersant inhibitor;

from 0.5 weight percent to 25.0 weight percent of a viscosity index improver; and

an effective amount of a nanostructure.

3. The lubricant concentrate according to claim 2, wherein said synthetic base oil comprises from 10.0 volume percent to 95 volume percent of an ester.

4. The lubricant concentrate according to claim 2, wherein said synthetic base comprises from 10.0 volume percent to 95 volume percent of a diester.

5. The lubricant concentrate according to claim 2, wherein said synthetic base stock comprises from 10.0 volume percent to 95 volume percent of a polyalphaolefin.

6. The lubricant concentrate according to claim 2, wherein said synthetic oil comprises from 10.0 volume percent to 95 volume percent of a polyalphaolefin in combination with an ester.

7. The lubricant concentrate according to claim 2, comprising from 1.0 to 3.0 weight percent of said oil soluble molybdenum additive.

8. The lubricant concentrate according to claim 2 wherein said synthetic base stock comprises at least 10% polyalphaolefins.

9. The lubricant concentrate according to claim 2, said dispersant inhibitor containing zinc dithiophosphate.

10. The lubricant concentrate according to claim 2, wherein said viscosity index improver is selected from the group consisting of polyisobutenes, polymethacrylate acid esters, polyacrylate acid esters, diene polymers, polyalkyl styrenes, alkenyl aryl conjugated diene copolymers, polyolefins, and combinations thereof.

11. The lubricant concentrate of claim 2, wherein said diester is a di-aliphatic diesters of alkyl carboxylic acid.

12. The lubricant concentrate of claim 11, wherein said di-aliphatic diesters of alkyl carboxylic acid is selected from the group consisting of di-2-ethylhexylazelate, di-isodecyladipate, and di-tridecyladipate.

13. The lubricant concentrate of claim 3, wherein said ester has a pour point of less than −

100°

C. and a viscosity of from 2 to 460 centistoke at 100°

C.

14. The lubricant of concentrate of claim 2, wherein said base oil is a combination of a mineral oil and a severely hydro cracked oil.

15. The lubricant concentrate of claim 2, wherein said base oil is a synthetic oil.

16. The lubricant concentrate of claim 5, wherein said polyalphaolefin is has a viscosity of from 2 to 460 centistoke.

17. The lubricant concentrate of claim 5, wherein said polyalphaolefin has a viscosity of from 2 to 10 centistoke at 200°

C.

18. The lubricant concentrate of claim 5, wherein said polyalphaolefin has a viscosity of from 4 to 6 centistoke at 200°

C.

19. The lubricant concentrate of claim 2, wherein said synthetic base stock comprises from 25 to 90 percent by volume.

20. The lubricant concentrate of claim 2, wherein said synthetic base stock comprises from 60 to 85 percent by volume.

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