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US 2019/0169526 A1Published application
Lubricant composition for gasoline engine and method for producing same
AssigneeIdemitsu Kosan Co., Ltd.
InventorKazushi TAMURA
Life of this patent
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Abstract
Provided is a lubricating oil composition having excellent detergency and LSPI preventing performance, and specifically a lubricating oil composition including a base oil, a calcium detergent, and a magnesium detergent and/or a sodium detergent, wherein the content of the calcium detergent as converted into a calcium atom and a mass ratio of a magnesium atom (Mg) contained in the magnesium detergent and/or a sodium atom (Na) contained in the sodium detergent to a calcium atom (Ca) [(Mg and/or Na)/Ca] fall within the specific ranges.
Claims16
1:
- A lubricating oil composition, comprising a base oil, a calcium detergent, and a magnesium detergent and/or a sodium detergent, wherein
- a content of the calcium detergent as converted into a calcium atom is less than 2,000 ppm by mass on a basis of the whole amount of the composition, and
- a mass ratio of a magnesium atom (Mg) contained in the magnesium detergent and/or a sodium atom (Na) contained in the sodium detergent to a calcium atom (Ca) [(Mg and/or Na)/Ca] is 0.05 to 1.50.
2:
- The lubricating oil composition according to claim 1, further comprising a poly(meth)acrylate.
3:
- The lubricating oil composition according to claim 1, wherein the content of the calcium detergent as converted into a calcium atom is 800 to 1,800 ppm by mass on a basis of the whole amount of the composition.
4:
- The lubricating oil composition according to claim 1, wherein a content of the magnesium detergent and/or the sodium detergent as converted to a magnesium atom and/or a sodium atom is 100 ppm by mass or more on a basis of the whole amount of the composition.
5:
- The lubricating oil composition according to claim 1, wherein a content of the magnesium detergent and/or the sodium detergent as converted to a magnesium atom and/or a sodium atom is 100 to 1,500 ppm by mass on a basis of the whole amount of the composition.
6:
- The lubricating oil composition according to claim 1, further comprising a succinimide and/or a boron-containing succinimide.
7:
- The lubricating oil composition according to claim 6, wherein a content of nitrogen in the composition is less than 0.16 mass %.
8:
- The lubricating oil composition according to claim 6, wherein a content of the boron-containing succinimide as converted into a boron atom is 600 ppm by mass or less on a basis of whole amount of the composition.
9:
- The lubricating oil composition according to claim 1, wherein a total base number of at least one of the magnesium detergent and the sodium detergent by the perchloric acid method as prescribed in JIS K2501 is 150 to 650 mg/KOH.
10:
- The lubricating oil composition according to claim 1, wherein the content of the calcium detergent as converted into a calcium atom is 800 ppm by mass or more on a basis of the whole amount of the composition.
11:
- The lubricating oil composition according to claim 1, wherein the content of the calcium detergent as converted into a calcium atom is 800 to 1,500 ppm by mass or more on a basis of the whole amount of the composition.
12:
- The lubricating oil composition according to claim 1, wherein a content of the magnesium detergent and/or the sodium detergent as converted to a magnesium atom and/or a sodium atom is 300 to 1,000 ppm by mass on a basis of the whole amount of the composition.
13:
- The lubricating oil composition according to claim 1, wherein the base oil is at least one selected from the group consisting of a mineral oil and a synthetic oil which are classified into Groups 3 to 5 of the base stock categories of the API (American Petroleum Institute).
14:
- The lubricating oil composition according to claim 1, which has a kinematic viscosity at 100° C. of 3.8 to 12.5 mm2/s.
15:
- The lubricating oil composition according to claim 1, which is suitable for a gasoline engine mounted with a direct injection supercharger.
16:
- A method for producing a lubricating oil composition, the method comprising:
- blending a base oil with a calcium detergent and a magnesium detergent and/or a sodium detergent, such that
- a content of the calcium detergent as converted into a calcium atom is less than 2,000 ppm by mass on a basis of the whole amount of the composition, and
- a mass ratio of a magnesium atom (Mg) contained in the magnesium detergent and/or a sodium atom (Na) contained in the sodium detergent to a calcium atom (Ca) [(Mg and/or Na)/Ca] is 0.05 to 1.50.
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