# US 4,396,514 A · Lubricating composition and method for making

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- Number: US 4,396,514 A
- Document ID: US4396514A
- Status: Granted
- Kind: A
- Application number: 06/345,931
- Filed: 1982-02-04
- Granted: 1983-08-02
- Earliest claimed: 1981-05-20
- Inventors: Sal A. Randisi
- Web page: https://patentgrep.com/patent/US4396514A

## CPC

- 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
- C10M 125/26: Compounds containing silicon or boron, e.g. silica, sand
- C10M 147/02: Monomer containing carbon, hydrogen and halogen only
- C10M 2201/087: Boron oxides, acids or salts
- C10M 2201/10: Compounds containing silicon
- C10M 2201/102: Silicates
- C10M 2201/105: Silica
- C10M 2205/00: Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M 2211/06: Perfluorinated compounds
- C10M 2213/02: obtained from monomers containing carbon, hydrogen and halogen only
- C10M 2213/062: Polytetrafluoroethylene [PTFE]
- C10N 2040/00: Specified use or application for which the lubricating composition is intended
- C10N 2040/30: Refrigerators lubricants {or compressors lubricants}
- C10N 2040/32: Wires, ropes or cables lubricants
- C10N 2040/34: Lubricating-sealants
- C10N 2040/36: Release agents {or mold release agents}
- C10N 2040/38: {Conveyors or chain belts}
- C10N 2040/40: {Generators or electric motors in oil or gas winning field}
- C10N 2040/42: {Flashing oils or marking oils}
- C10N 2040/44: {Super vacuum or supercritical use}
- C10N 2040/50: {Medical uses}
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## Abstract

A lubricating composition is provided which is a stable dispersion of a lubricating fluid such as a natural or synthetic petroleum distillate, and a finely divided polymeric fluorocarbon powder such as polytetrafluoroethylene such as Teflon and a silicon dioxide powder such as a fumed silica. The composition is best provided by utilization of a disc impeller at elevated temperature to attain a moisture-free, even dispersion of the Teflon and the silica in the fluid. The lubricating composition is particularly useful in wide temperature range service, particularly so at extremely high and low temperatures.

## Claims

### Claim 1

A lubricating composition useful for wide temperature range service, said lubricating composition having a service temperature range from about -72.degree. F. to about 500.degree. F. and an electrical resistance ranging from about 1.times.10.sup.14 Ohm-cm to about 2.times.10.sup.14 Ohm-cm at 100 volts, said lubricating composition comprising a stable dispersion of:
a. a hydrocarbon lubricating liquid, said hydrocarbon liquid comprising from about 50% to about 95% of said lubricating composition;
b. a finely divided polymeric fluorocarbon powder comprising polytetrafluoroethylene in the form of a finely divided powder with particles ranging from about 0.1 to 100 microns in size and having a melting temperature above 450.degree. F., said polymeric fluorocarbon powder comprising from about 1% to about 3% of said lubricating composition, and;
c. a silicon dioxide in the form of a finely divided fumed silica powder with particles ranging from about 7 to about 40 millimicrons in size, said silicon dioxide comprising from about 2% to about 10% of said lubricating composition.

### Claim 2 (depends on 1)

The lubricating composition of claim 1, wherein the fumed silica is evenly dispersed within the lubricating liquid and polymeric fluorocarbon powder.

### Claim 3 (depends on 2)

The lubricating composition of claim 2, wherein the lubricating liquid is a petroleum distillate.

### Claim 4 (depends on 2)

The lubricating composition of claim 2, wherein the lubricating liquid is synthesized hydrocarbon.

### Claim 5 (depends on 2)

The lubricating composition of claim 2, wherein the lubricating liquid comprises a petroleum distillate and a synthesized hydrocarbon.

### Claim 6

A method for making a lubricating composition useful for wide temperature range service, said lubricating composition being a stable dispersion and having a service temperature range from about -72.degree. F. to about 500.degree. F. and an electrical resistance ranging from about 1.times.10.sup.14 Ohm-cm to about 2.times.10.sup.14 Ohm-cm at 100 volts, said method comprising:
a. providing a hydrocarbon lubricating liquid, said hydrocarbon liquid comprising from about 50% to about 95% of said lubricating composition;
b. adding and mixing into said hydrocarbon liquid finely divided polymeric fluorocarbon particulates in a first mixing step, said polymeric fluorocarbon particulates comprising polytetrafluoroethylene in the form of a finely divided powder with particles ranging from about 0.1 to 100 microns in size and having a melting temperature above 450.degree. F., said polymeric fluorocarbon powder comprising from about 1% to about 3% of said lubricating composition, and
c. subsequently adding to the hydrocarbon liquid-polymeric fluorocarbon powder mixture produced by step (b), and mixing into said mixture in a second mixing step, finely divided silicon dioxide particulates in the form of a finely divided fumed silica powder with particles ranging from about 7 to about 40 millimicrons in size, said silicon dioxide particulates comprising from about 2% to about 10% of said lubricating coposition;
said first and second mixing steps being carried out by contacting said components with a rotating disc impeller, so as to provide evenly dispersed particulates of both said polymeric fluorocarbon powder and said silicon dioxide powder in said hydrocarbon lubricating liquid.

### Claim 7 (depends on 6)

The method of claim 6, further comprising adding a surfactant to the liquid and then adding the particulates to the liquid.

### Claim 8 (depends on 7)

The method of claim 7, wherein the polymeric fluorocarbon particulates comprising polytetrafluoroethylene are added prior to adding the silicon dioxide particulates.

### Claim 9 (depends on 6)

The method of claim 6, wherein said disc has flanged teeth.

### Claim 10 (depends on 6)

The method of claim 6, wherein said liquid is first mixed to a temperature of about 105.degree. F. to 125.degree. F., and then the particulates are added.

### Claim 11 (depends on 10)

The method of claim 10, further comprising adding a surfactant to the fluid and then adding the particulates to the fluid.

### Claim 12 (depends on 10)

The method of claim 10, wherein said temperature is about 112.degree. to 118.degree. F.

### Claim 13 (depends on 10)

The method of claim 10, wherein the temperature is achieved through friction of the disc action in the liquid.

### Claim 14 (depends on 10)

The method of claim 10, wherein the mixing at said temperature provides an essentially moisture-free liquid.

### Claim 15 (depends on 6)

The method of claim 6, wherein said disc further comprises radially curved grooves.

### Claim 16 (depends on 7)

The method of claim 7, wherein the lubricating liquid, surfactant, polymeric fluorocarbon particulates and silicon dioxide particulates are mixed for a total of about 2 hours to provide the lubricating composition.

### Claim 17 (depends on 16)

The method of claim 16, wherein the mixing for that time provides a fixotropic composition.

### Claim 18 (depends on 16)

The method of claim 16, wherein the lubricating liquid and surfactant are mixed for about 20 to 30 minutes.

### Claim 19 (depends on 18)

The method of claim 18, wherein the lubricating liquid, surfactant and polymeric fluorocarbon particulates are mixed for about 10 to 15 minutes.