High-temperature, water-based lubricant and process for making the same

• US 20010001096A1
• Filed: 12/29/2000
• Published: 05/10/2001
• Est. Priority Date: 11/19/1998
• Status: Active Grant

• Current Assignee: Kenneth Skiles, Michael A. Castro, Peter L. Zaleski
• Original Assignee: Kenneth Skiles, Michael A. Castro, Peter L. Zaleski
• Inventors: Castro, Michael A., Skiles, Kenneth, Zaleski, Peter L.
• Granted Patent: US 6,350,722 B2
• Time in Patent Office: Days
• US Class Current: 508/115
• CPC Class Codes: C10M 125/02 Carbon; Graphite
• CPC Class Codes: C10M 125/26 Compounds containing silicon or boron, e.g. silica, sand
• CPC Class Codes: C10M 129/08 containing at least 2 hydroxy groups
• CPC Class Codes: C10M 145/40 Polysaccharides, e.g. cellulose
• CPC Class Codes: C10M 173/02 not containing mineral or fatty oils
• CPC Class Codes: C10M 2201/02 Water
• CPC Class Codes: C10M 2201/041 Carbon; Graphite; Carbon black
• CPC Class Codes: C10M 2201/042 halogenated, i.e. graphite fluoride
• CPC Class Codes: C10M 2201/087 Boron oxides, acids or salts
• CPC Class Codes: C10M 2207/022 containing at least two hydroxy groups
• CPC Class Codes: C10M 2209/12 Polysaccharides, e.g. cellulose, biopolymers
• CPC Class Codes: C10N 2040/00 Specified use or application for which the lubricating composition is intended
• CPC Class Codes: C10N 2040/30 Refrigerators lubricants or compressors lubricants
• CPC Class Codes: C10N 2040/32 Wires, ropes or cables lubricants
• CPC Class Codes: C10N 2040/34 Lubricating-sealants
• CPC Class Codes: C10N 2040/36 Release agents or mold release agents
• CPC Class Codes: C10N 2040/38 Conveyors or chain belts
• CPC Class Codes: C10N 2040/40 Generators or electric motors in oil or gas winning field
• CPC Class Codes: C10N 2040/42 Flashing oils or marking oils
• CPC Class Codes: C10N 2040/44 Super vacuum or supercritical use
• CPC Class Codes: C10N 2040/50 : Medical uses
• CPC Class Codes: C10N 2050/01 : Emulsions, colloids, or micelles

Abstract

A high-temperature lubricant comprising a water-base and minor effective amounts of borate, dextrin, graphite, xanthan gum, and an organic preservative. A powder for preparing a water-based high temperature lubricant is disclosed in which the powder comprises graphite and minor effective amounts of borate, dextrin, and xanthan gum. A continuous process for making the lubricant is also disclosed.

Claims

1. A high-temperature lubricant comprising a water base and minor effective amounts of borate, dextrin, graphite, xanthan gum, and an organic preservative.

2. A high-temperature lubricant comprising:

between about 60 wt % and 80 wt % water;

between about 0.1 wt % and 1.0 wt % of borate;

between about 5.0 wt % and 15.0 wt % of dextrin;

between about 10.0 wt % and 30.0 wt % graphite;

between about 0.5 wt % and 1.0 wt % xanthan gum; and

between about 0.1 wt % and 0.3 wt % of an organic preservative.

3. The lubricant of

claim 2

comprising approximately 69.8 wt % water;

approximately 0.5 wt % borate;

approximately 10.0 wt % dextrin;

approximately 19.3 wt % graphite;

approximately 19.3 wt % graphite;

approximately 0.2 wt % xanthan gum; and

approximately 0.2 wt % of an organic preservative.

4. The lubricant of

claim 2

or

3

wherein the preservative is a 50% solution of glutaraldehyde;

the borate is a 10 mole powdered borax;

the dextrin is between 95% and 100% soluble in water;

the graphite has an average particular size of 30 microns; and

the xanthan gum has an average particle size of 175 microns.

5. A powder for preparing a water-based, high-temperature lubricant comprising graphite and minor effective amounts of borate, dextrin, and xanthan gum.

6. A powder for preparing a water-based, high-temperature lubricant comprising:

between about 0.5 wt % and 2.0 wt % of borate;

between about 31.0 wt % and 34.0 wt % of dextrin;

between about 63.0 wt % and 66.0 wt % graphite; and

between about 0.5 wt % and 1.3 wt % xanthan gum.

7. The powder of

claim 6

comprising approximately 1.7 wt % borate;

approximately 33.3 wt % dextrin;

approximately 64.3 wt % graphite; and

approximately 0.7 wt % xanthan gum.

8. The powder of

claim 6

or

7

wherein the borate is a 10 mole powered borax;

the dextrin is between 95 and 100% soluble in water;

the graphite has an average particle size of approximately 30 microns; and

the xanthan gum has an average particle size of approximately 175 microns.

9. A process for continuously making a water-based lubricant containing suspended graphite comprising:

supplying water at a pre-determined and controllable rate by means of a first metering pump;

supplying a preservative at a pre-determined and controllable-rate by means of a second metering pump;

combining the water and preservative and injecting the combined water and preservative into a powder injector;

introducing pre-determined amounts of graphite, dextrin, borax, and xanthan gum into the powder injector to combine them with the water and preservative;

pumping the water, preservative, graphite, dextrin, borax and xanthan gum into a high shear mixer; and

introducing the resulting suspension into a container.

10. The process of

claim 9

wherein the graphite, dextrin, borax, and xanthan gum are introduced separately into the powder injector by means of separate metering screw feeders.

11. The process of

claim 9

wherein the graphite, dextrin, borax, and xanthan gum are combined and introduced into the powder injector by means of a single metering screw feeder.

12. A continuous process for making a lubricating suspension comprising:

supplying a liquid selected from the group consisting of water, oil, hydrocarbons and solvents at a pre-determined and controllable rate by means of a metering pump and injecting the liquid into a powder injector;

introducing pre-determined amounts of a lubricating particles from the group consisting of graphite, borax, boron nitride, molybdenum disulfide and talc into the powder injector to combine the powder with the liquid;

pumping the liquid and lubricating powder into a high shear mixer; and

introducing the resulting suspension into a container.