Ionic liquids containing quaternary ammonium and phosphonium cations, and their use as environmentally friendly lubricant additives

Patent metadata

Field	Value
Publication number	US-11760766-B2
Application number	US-202017078668-A
Country	US
Kind code	B2
Filing date	Oct 23, 2020
Priority date	Jul 28, 2020
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

An ionic liquid composition having the following generic structural formula:wherein Z is N or P, and R1, R2, R3, and R4 are independently selected from hydrogen atom and hydrocarbon groups having one to four carbon atoms with optional interconnection to form a cyclic group that includes Z, and wherein R1, R2, R3, and R4 are all hydrocarbon groups when Z is P, and X− is a phosphorus-containing or carboxylate anion, particularly an organophosphate, organophosphonate, or organophosphinate anion, or a thio-substituted analog thereof containing hydrocarbon groups with at least three carbon atoms. Also described are lubricant compositions comprising the above ionic liquid and a base lubricant, wherein the ionic liquid is dissolved in the base lubricant. Further described are methods for applying the ionic liquid or lubricant composition onto a mechanical device for which lubrication is beneficial, with resulting improvement in friction reduction, wear rate, and/or corrosion inhibition.

First claim

What is claimed is:

1. A lubricant composition comprising:
(i) an ionic liquid selected from the group consisting of:

and
(ii) a base lubricant selected from the group consisting of polyalkylene glycols, vegetable oils, synthetic ester oils, polyalphaolefins, and water;
wherein said ionic liquid is dissolved in said base lubricant and is included in said lubricant composition in a concentration in a range of 0.1-5 wt %, wherein the concentrations in said range are substantially non-toxic to aquatic life.

2. A lubricant composition comprising:
(i) an ionic liquid having the following formula:

and
(ii) a polyalkylene glycol base lubricant;
wherein said ionic liquid is dissolved in said base lubricant and is included in said lubricant composition in a concentration in a range of 0.1-5 wt %, wherein the concentrations in said range are substantially non-toxic to aquatic life.

3. The lubricant composition of claim 1 , wherein said ionic liquid is included in said lubricant composition in an amount of 0.1-3 wt %.

4. The lubricant composition of claim 1 , wherein said ionic liquid is included in said lubricant composition in an amount of 0.1-2 wt %.

5. The lubricant composition of claim 1 , wherein said ionic liquid is included in said lubricant composition in an amount of 0.1-1 wt %.

6. The lubricant composition of claim 1 , wherein said base lubricant comprises a polyalkylene glycol.

7. The lubricant composition of claim 1 , wherein said base lubricant comprises a vegetable oil.

8. The lubricant composition of claim 1 , wherein said base lubricant comprises a synthetic ester oil.

9. The lubricant composition of claim 1 , wherein said base lubricant comprises a polyalphaolefin.

10. The lubricant composition of claim 1 , wherein said base lubricant comprises water.

11. The lubricant composition of claim 1 , wherein said ionic liquid is included in said lubricant composition in an amount of 0.5-5 wt %.

Assignees

• Ut Battelle Llc

Inventors

• Qu Jun
• Luo Huimin
• He Xin

Classifications

• C07F9/5421 Primary

  substituted by a phosphorus atom (C07F9/5449 takes precedence) · CPC title

• C07F9/5463 Primary

  Compounds of the type "quasi-phosphonium", e.g. (C)a-P-(Y)b wherein a+b=4, b>=1 and Y=heteroatom, generally N or O · CPC title

• C10M171/00

  Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated (chemically defined ingredients C10M101/00 - C10M169/00; petroleum fractions C10M101/02, C10M121/02, C10M159/04) · CPC title

• C10M2209/1045

  used as base material · CPC title

• C10M2209/1055

  used as base material · CPC title