Anti-degradation and self-healing lubricating oil

Patent metadata

Field	Value
Publication number	US-2018291303-A1
Application number	US-201715480640-A
Country	US
Kind code	A1
Filing date	Apr 6, 2017
Priority date	Apr 6, 2017
Publication date	Oct 11, 2018
Grant date	—

Abstract

A lubricating oil comprises a base oil; and an anti-degradation additive comprising microcapsules, nanocapsules, or a combination comprising at least one of the foregoing; the microcapsules and the nanocapsules each independently having a core of a neutralizing material and a polymeric encapsulant configured to release the neutralizing material in an acidic environment by breaking crosslinks or hydrogen bonds in the polymeric encapsulant. The released neutralizing material can prevent the formation of viscous, high molecular weight molecules thus enhancing the lifetime of the lubricating oil and improving its reliability.

First claim

1 . A lubricating oil comprising:
a base oil; and an anti-degradation additive comprising nanocapsules having an average particle size of about 1 nm to about 500 nm; the nanocapsules having a core of a neutralizing material and a polymeric encapsulant configured to release the neutralizing material in an acidic environment, wherein the neutralizing material comprises a C 10-20 amine, a C 10-20 alcohol, or a combination comprising at least one of the foregoing.

2 . (canceled)

3 . (canceled)

4 . The lubricating oil of claim 1 , wherein the polymeric encapsulant comprises a chitosan having acid-labile crosslinks, a pyridine-containing polyurethane, a pyridine-containing polyurea, or a combination comprising at least one of the foregoing.

5 . The lubricating oil of claim 4 , wherein the acid-labile crosslinks comprise beta thiopropionate, glutaraldehyde, epichlorohydrin, or a combination comprising at least one of the foregoing.

6 . The lubricating oil of claim 1 , comprising up to about 30 volume percent of the anti-degradation additive.

7 . The lubricating oil of claim 1 , wherein the anti-degradation additive comprises nanocapsules having an average particle size of about 10 nm to 250 nm.

8 . The lubricating oil of claim 1 , wherein the lubricating oil has a dynamic viscosity of about 1 cP to about 2,000 cP at 23° C.

9 . A method of reducing degradation of a lubricating oil in a downhole environment, the method comprising:
adding to a base oil an anti-degradation additive comprising nanocapsules having an average particle size of about 1 nm to about 500 nm; the nanocapsules having a core of a neutralizing material and a polymeric encapsulant configured to release the neutralizing material in an acidic environment, wherein the neutralizing material comprises a C 10-20 amine, a C 10-20 alcohol, or a combination comprising at least one of the foregoing.

10 . The method of claim 9 , wherein the polymeric encapsulant comprises a chitosan having acid-labile crosslinks, a pyridine-containing polyurethane, a pyridine-containing polyurea, or a combination comprising at least one of the foregoing.

11 . The method of claim 10 , further comprising:
breaking the acid-labile crosslinks of the chitosan; and releasing the neutralizing material from the polymeric encapsulant comprising the chitosan having acid-labile crosslinks.

12 . The method of claim 11 , wherein the acid-labile crosslinks comprise beta thiopropionate, glutaraldehyde, epichlorhydrin, or a combination comprising at least one of the foregoing.

13 . The method of claim 10 , further comprising:
breaking a hydrogen bond between the nitrogen atom of a pyridine and the H atom of a H—N-moiety on the polyurethane; and releasing the neutralizing material from the polymeric encapsulant comprising the pyridine-containing polyurethane.

14 . The method of claim 9 , further comprising neutralizing an acidic byproduct generated from the lubricating oil during use with the neutralizing material released from the polymeric encapsulant.

15 . (canceled)

16 . (canceled)

17 . The method of claim 9 , wherein the lubricating oil comprises up to about 30 volume percent of the anti-degradation additive, based on the total volume of the lubricating oil.

18 . An engine lubricating system comprising:
a circulation system for providing a continuing flow of a lubricating oil to an internal combustion engine; and a lubricating oil disposed within the circulation system, the lubricating oil comprising a base oil; and an anti-degradation additive comprising nanocapsules having an average particle size of about 1 nm to about 500 nm; the nanocapsules having a core of a neutralizing material and a polymeric encapsulant configured to release the neutralizing material in an acidic environment, wherein the neutralizing material comprises a C 10-20 amine, a C 10-20 alcohol, or a combination comprising at least one of the foregoing.

19 . An electric motor, comprising:
a rotatable shaft; a stator; a rotor disposed within the stator and spaced from the stator by a running clearance therebetween, the rotor configured for rotation of the shaft; and a lubricating oil disposed in the running clearance, the lubricating oil comprising a base oil an anti-degradation additive comprising nanocapsules having an average particle size of about 1 nm to about 500 nm; the nanocapsules having a core of a neutralizing material and a polymeric encapsulant configured to release the neutralizing material in an acidic environment, wherein the neutralizing material comprises a C 10-20 amine, a C 10-20 alcohol, or a combination comprising at least one of the foregoing.

20 . The lubricating oil of claim 1 , wherein the nanoparticles have a core/shell structure, and a thickness of the shell is about 10 nm to about 50 nm.

21 . The lubricating oil of claim 20 , wherein the thickness of the shell is about 5 nm to about 15 nm.

22 . The lubricating oil of claim 1 , wherein the polymeric encapsulant comprises a pyridine-containing polyurethane.

23 . The lubricating oil of claim 1 , wherein the polymeric encapsulant comprises a pyridine-containing polyurea.

24 . The lubricating oil of claim 1 , comprising about 0.01 to about 15 volume percent of the anti-degradation additive, based on the total volume of the lubricating oil.

Assignees

• Ventura Darryl
• Dolog Rostyslav
• Mazyar Oleg A
• Khabashesku Valery
• Darugar Qusai
• Baker Hughes Inc

Inventors

• Ventura Darryl
• Dolog Rostyslav
• Mazyar Oleg A
• Khabashesku Valery
• Darugar Qusai

Classifications

• C10N2040/14

  Electric or magnetic purposes · CPC title

• C10M171/06

  Particles of special shape or size · CPC title

• C10N2020/02

  Viscosity; Viscosity index · CPC title

• C09K2208/34

  Lubricant additives · CPC title

• C10N2040/40

  Generators or electric motors in oil or gas winning field · CPC title