Defoaming agent and lubricating oil composition

Patent metadata

Field	Value
Publication number	US-10647941-B2
Application number	US-201615749875-A
Country	US
Kind code	B2
Filing date	Aug 19, 2016
Priority date	Aug 19, 2015
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

A defoaming agent comprising: a polymer comprising a repeating unit represented by the following general formula (1):

where in the general formula (1), X 1 is a repeating unit obtainable by polymerization of an ethylenic unsaturated group; Y 1 is a side chain comprising a linear or branched polysiloxane structure, the polysiloxane structure comprising a repeating unit represented by the following general formula (2) and having a polymerization degree of 5 to 300; and Z 1 is a linking group linking the repeating unit X 1 and the side chain Y 1 ;

wherein in the general formula (2), R 1 and R 2 are each independently an organic group having a carbon number of 1 to 18.

First claim

We claim:

1. A defoaming agent comprising:
a polymer comprising a repeating unit represented by the following general formula (1):

wherein in the general formula (1), X 1 is a repeating unit obtainable by polymerization of a first ethylenic unsaturated group; Y 1 is a side chain comprising a linear or branched polysiloxane structure, the polysiloxane structure comprising a repeating unit represented by the following general formula (2) and having a polymerization degree of 5 to 300; and Z 1 is a linking group linking the repeating unit X 1 and the side chain Y 1 ;

wherein in the general formula (2), R 1 and R 2 are each independently an organic group having a carbon number of 1 to 18;
the polymer further comprising a repeating unit represented by the following general formula (3):

wherein in the general formula (3), X 2 is a repeating unit obtainable by polymerization of a second ethylenic unsaturated group; Y 2 is a side chain comprising no less than 3 fluorine atoms; and Z 2 is a linking group linking the repeating unit X 2 and the side chain Y 2 .

2. The defoaming agent according to claim 1 ,
wherein X 2 is a repeating unit obtainable by polymerization of a second (meth)acryloyl group.

3. The defoaming agent according to claim 1 ,
wherein X 1 is a repeating unit obtainable by polymerization of a first (meth)acryloyl group.

4. The defoaming agent according to claim 1 ,
wherein the polymer comprises the repeating unit represented by the general formula (1) in an amount of no less than 10 mass % on the basis of the total mass of all repeating units in the polymer.

5. The defoaming agent according to claim 1 ,
wherein the polymer has a weight average molecular weight of 10,000 to 1,000,000.

6. A defoaming agent comprising:
a polymer comprising a repeating unit represented by the following general formula (1):

wherein in the general formula (1), X 1 is a repeating unit obtainable by polymerization of a first ethylenic unsaturated group; Y 1 is a side chain comprising a linear or branched polysiloxane structure, the polysiloxane structure comprising a repeating unit represented by the following general formula (2) and having a polymerization degree of 5 to 300; and Z 1 is a linking group linking the repeating unit X 1 and the side chain Y 1 ;

wherein in the general formula (2), R 1 and R 2 are each independently an organic group having a carbon number of 1 to 18;
wherein the polymer is a star-shaped polymer.

7. A lubricating oil composition comprising:
(A) a lubricant base oil; and
(B) the defoaming agent as in claim 1 , in an amount of 1 to 100 mass ppm in terms of silicon on the basis of the total mass of the composition.

8. A method for lubricating an automobile engine, an automobile transmission, or an automobile transaxle unit, comprising
supplying the lubricating oil composition according to claim 7 to an automobile engine, an automobile transmission, or an automobile transaxle unit.

9. The defoaming agent according to claim 6 ,
wherein X 1 is a repeating unit obtainable by polymerization of a first (meth)acryloyl group.

10. The defoaming agent according to claim 6 ,
wherein the polymer comprises the repeating unit represented by the general formula (1) in an amount of no less than 10 mass % on the basis of the total mass of all repeating units in the polymer.

11. The defoaming agent according to claim 6 ,
wherein the polymer has a weight average molecular weight of 10,000 to 1,000,000.

12. A lubricating oil composition comprising:
(A) a lubricant base oil; and
(B) the defoaming agent as in claim 6 , in an amount of 1 to 100 mass ppm in terms of silicon on the basis of the total mass of the composition.

13. A method for lubricating an automobile engine, an automobile transmission, or an automobile transaxle unit, comprising:
supplying the lubricating oil composition of claim 12 to an automobile engine, an automobile transmission, or an automobile transaxle unit.

14. A lubricating oil composition comprising:
(A) a lubricant base oil; and
(B) a defoaming agent in an amount of 1 to 100 mass ppm in terms of silicon on the basis of the total mass of the composition, the defoaming agent comprising a polymer, the polymer comprising a repeating unit represented by the following general formula (1):

wherein in the general formula (1), X 1 is a repeating unit obtainable by polymerization of a first ethylenic unsaturated group; Y 1 is a side chain comprising a linear or branched polysiloxane structure, the polysiloxane structure comprising a repeating unit represented by the following general formula (2) and having a polymerization degree of 5 to 300; and Z 1 is a linking group linking the repeating unit X 1 and the side chain Y 1 ;

wherein in the general formula (2), R 1 and R 2 are each independently an organic group having a carbon number of 1 to 18,
wherein X 1 is a repeating unit obtainable by polymerization of a first (meth)acryloyl group.

15. The defoaming agent according to claim 14 ,
wherein the polymer comprises the repeating unit represented by the general formula (1) in an amount of no less than 10 mass % on the basis of the total mass of all repeating units in the polymer.

16. The defoaming agent according to claim 14 ,
wherein the polymer has a weight average molecular weight of 10,000 to 1,000,000.

17. A method for lubricating an automobile engine, an automobile transmission, or an automobile transaxle unit, the method comprising:
supplying the lubricating oil composition as in claim 14 to an automobile engine, an automobile transmission, or an automobile transaxle unit.

Assignees

• Jxtg Nippon Oil & Energy Corp

Inventors

• Takagi Akira
• Matsuki Shingo

Classifications

• C10N2040/10

  Running-in-oil {; Grinding} · CPC title

• C10N2040/04

  Oil-bath; Gear-boxes; Automatic transmissions; Traction drives · CPC title

• C10M159/12

  Reaction products · CPC title

• C10M2229/02

  Unspecified siloxanes; Silicones · CPC title

• C10M2229/048

  containing carboxyl groups · CPC title