JP2023150884A - lubricating oil composition - Google Patents

Abstract

To provide a lubricating oil composition which can be suitably used in an internal combustion engine of a hybrid system having the internal combustion engine and an electric motor as a power source, the lubricating oil composition having improved properties including a high-temperature cleaning property and a long drain property.SOLUTION: A lubricating oil composition includes (A) a base oil, (B) one or more amine compounds selected from (B1) a hindered amine compound and (B2) an alkanolamine compound, and (C) a neutral metal salicylate having a base number of 0 to 100 mgKOH/g. The lubricating oil composition has a component (B1) content based on a total amount thereof of 1.50 mass% or more and less than 3.50 mass%.SELECTED DRAWING: None

Description

The present invention relates to a lubricating oil composition, an internal combustion engine filled with the lubricating oil composition, and a method of using the lubricating oil composition.

In recent years, environmental regulations have become increasingly strict on a global scale, and in particular, the conditions surrounding automobiles, such as fuel efficiency regulations and exhaust gas regulations, are becoming increasingly strict. The background to this is environmental issues such as global warming and resource conservation due to concerns about the depletion of oil resources. Under these recent circumstances, in order to reduce air pollution caused by vehicle exhaust gas, the production ratio of hybrid vehicles equipped with electric motors as well as internal combustion engines has been increasing.
Incidentally, the lubricating oil for the internal combustion engine of a hybrid vehicle is the same engine oil used for the internal combustion engine of a conventional vehicle that is driven only by an internal combustion engine. Development of lubricating oil is progressing.

For example, Patent Document 1 discloses that a 100N hydrotreated mineral oil contains a hindered amine compound, an amine antioxidant, a metal detergent, and an organic zinc dithiophosphate, and the hindered amine compound and the amine antioxidant are mixed in a predetermined ratio. A lubricating oil composition for an internal combustion engine of a hybrid vehicle, comprising:

Japanese Patent Application Publication No. 2016-180069

Under these circumstances, there is a need for a lubricating oil composition that has improved properties such as high-temperature cleanliness and long-drainage properties and can be suitably used in the internal combustion engine of a hybrid system that uses an internal combustion engine and an electric motor as power sources. It is being

As a result of extensive studies, the present inventors have found that the above problems can be solved by creating a lubricating oil composition containing a specific amine compound and a neutral metal salicylate together with a base oil. Specifically, the present invention discloses the following aspects.
[1] Base oil (A), one or more amine compounds (B) selected from hindered amine compounds (B1) and alkanolamine compounds (B2), and a neutral base number of 0 to 100 mgKOH/g A lubricating oil composition containing metal salicylate (C),
The content of component (B1) is 1.50% by mass or more and less than 3.50% by mass, based on the total amount of the lubricating oil composition.
Lubricating oil composition.
[2] Base oil (A), one or more amine compounds (B) selected from hindered amine compounds (B1) and alkanolamine compounds (B2), and a neutral base number of 0 to 100 mgKOH/g A lubricating oil composition containing metal salicylate (C),
The content of component (B2) is 2.20% by mass or more based on the total amount of the lubricating oil composition.
Lubricating oil composition.
[3] An internal combustion engine installed in a hybrid system, filled with the lubricating oil composition according to [1] or [2] above.
[4] A method for lubricating an internal combustion engine, in which the lubricating oil composition according to [1] or [2] above is applied to an internal combustion engine installed in a hybrid system.

A lubricating oil composition according to a preferred embodiment of the present invention has excellent high-temperature cleanliness and long-drain properties, and in a more preferred embodiment, in addition to these properties, it has excellent long-drain properties even when water is mixed in. can maintain sex. Therefore, the lubricating oil composition of one embodiment of the present invention can be suitably used for lubricating an internal combustion engine of a hybrid system.

Regarding the numerical ranges described in this specification, the upper and lower limits can be arbitrarily combined. For example, when a numerical range is described as "preferably 30 to 100, more preferably 40 to 80", the range of "30 to 80" and the range of "40 to 100" are also described in this specification. Included in the specified numerical range.
Further, as a numerical range described in this specification, for example, the description “60 to 100” means a range of “60 or more and 100 or less”.
Further, in defining the upper limit value and lower limit value described in this specification, the numerical range from the lower limit value to the upper limit value can be defined by appropriately selecting from each option and combining them arbitrarily.
In addition, a plurality of the various requirements described as preferred embodiments described herein can be combined.

In this specification, kinematic viscosity and viscosity index mean values measured and calculated in accordance with JIS K2283:2000.
The contents of alkali metals, alkaline earth metals, phosphorus atoms (P), boron atoms (B), and zinc atoms (Zn) mean values measured in accordance with JPI-5S-38-92.
The nitrogen atom (N) content means a value measured in accordance with JIS K2609:1998.
The base number is specified in 7. of JIS K2501 "Petroleum products and lubricating oils - Neutralization number test method". It means the base number measured by the hydrochloric acid method according to .

[Composition of lubricating oil composition]
A lubricating oil composition according to one embodiment of the present invention comprises a base oil (A), one or more amine compounds (B) selected from a hindered amine compound (B1) and an alkanolamine compound (B2), and a base value contains 0 to 100 mg KOH/g of neutral metal salicylate (C), and component (B) satisfies at least one of the following requirements (I) and (II).
- Requirement (I): The content of component (B1) is 0.60% by mass or more and less than 3.50% by mass, based on the total amount of the lubricating oil composition.
- Requirement (II): Component (B) contains at least component (B2).

The internal combustion engine of a hybrid vehicle, which is equipped with an electric motor as well as an internal combustion engine, is stopped for a longer period of time than the internal combustion engine of a conventional vehicle, even when the vehicle is in use, resulting in condensation forming inside the crankshaft. easy. Therefore, lubricating oil compositions used in hybrid systems such as hybrid vehicles are likely to contain moisture, and this moisture tends to cause a decline in long-drain properties.
Furthermore, high-temperature detergency is required for lubricating oil compositions used in internal combustion engines. Generally, in order to obtain lubricating oil compositions with improved high-temperature detergency, metal-based detergents such as calcium sulfonate are often used. However, according to studies conducted by the present inventors, it has been found that metal-based detergents such as calcium sulfonate tend to cause a decrease in long drain performance when water is mixed in.
As described above, in order to provide a lubricating oil composition that can improve high-temperature cleanliness and also maintain good long-drain properties when water is mixed in, the present inventors have conducted extensive studies and have met the above requirements. It has been found that the above problem can be solved by creating a lubricating oil composition that uses a combination of an amine compound (B) that satisfies at least one of I) and (II) and a neutral metal salicylate. A lubricating oil composition according to one embodiment of the present invention has been completed based on this knowledge.

The lubricating oil composition of one embodiment of the present invention may further contain an antioxidant (D) that does not fall under component (B).
The lubricating oil composition of one embodiment of the present invention may further contain an imide compound (E).
The lubricating oil composition of one embodiment of the present invention may further contain zinc (F) dithiophosphate.
The lubricating oil composition of one embodiment of the present invention may further contain an organic molybdenum compound (G), as long as the effects of the present invention are not impaired. , may contain other lubricating oil additives other than the above components (B) to (G).

In the lubricating oil composition of one aspect of the present invention, the total content of components (A), (B), and (C) is preferably 50% by mass based on the total amount (100% by mass) of the lubricating oil composition. More preferably 60% by mass or more, still more preferably 65% by mass or more, even more preferably 70% by mass or more, particularly preferably 75% by mass or more, and 100% by mass or less, 99.99% by mass or less , 99.90% by mass or less, 99.50% by mass or less, 99.0% by mass or less, 98.0% by mass or less, 97.0% by mass or less, 95.0% by mass or less, 92.0% by mass or less, Alternatively, it may be 91.0% by mass or less.

In the lubricating oil composition of one aspect of the present invention, the total content of components (A), (B), (C), (D), (E), (F), and (G) is Based on the total amount (100% by mass) of the product, preferably 60% by mass or more, more preferably 65% by mass or more, even more preferably 70% by mass or more, even more preferably 75% by mass or more, particularly preferably 80% by mass or more. The content may also be 100% by mass or less, 99.99% by mass or less, 99.90% by mass or less, 99.50% by mass or less, or 99.0% by mass or less.

The details of each component contained in the lubricating oil composition of one embodiment of the present invention will be described below.

<Component (A): Base oil>
In the lubricating oil composition of one embodiment of the present invention, the base oil used as component (A) may be one or more selected from mineral oils and synthetic oils.
Mineral oils include, for example, atmospheric residual oils obtained by atmospheric distillation of crude oils such as paraffinic crude oil, intermediate crude oil, and naphthenic crude oil; Extracted oil; Refined oil obtained by subjecting the distillate to one or more refining treatments such as solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, and hydrorefining; It will be done.

Synthetic oils include, for example, polyolefins such as α-olefin homopolymers or α-olefin copolymers (for example, α-olefin copolymers having 8 to 14 carbon atoms such as ethylene-α-olefin copolymers). α-olefins; isoparaffins; polyalkylene glycols; ester oils such as polyol esters, dibasic acid esters, and phosphoric acid esters; ether oils such as polyphenyl ethers; alkylbenzenes; alkylnaphthalenes; Examples include synthetic oil (GTL) obtained by isomerizing manufactured wax (GTL wax (Gas To Liquids WAX)).

Component (A) used in one embodiment of the present invention is preferably one or more selected from mineral oils and synthetic oils classified into Group II and Group III of the API (American Petroleum Institute) base oil category.

The kinematic viscosity at 40°C of component (A) used in one aspect of the present invention is preferably 3.0 to 120 mm ² /s, more preferably 3.5 to 100 mm ² /s, and still more preferably 4.0 to 70 mm. ² /s, more preferably 4.5 to 50 mm ² /s, particularly preferably 5.0 to 30 mm ² /s.

The viscosity index of component (A) used in one aspect of the present invention is preferably 70 or more, more preferably 90 or more, even more preferably 100 or more, even more preferably 110 or more, particularly preferably 120 or more.
In addition, in one aspect of the present invention, when a mixed oil that is a combination of two or more base oils is used as component (A), it is preferable that the kinematic viscosity and viscosity index of the mixed oil are within the above ranges.

In the lubricating oil composition of one aspect of the present invention, the content of component (A) is preferably 40% by mass or more, more preferably 50% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition. , more preferably 60% by mass or more, even more preferably 65% by mass or more, particularly preferably 70% by mass or more, and 99.4% by mass or less, 99.0% by mass or less, 97.0% by mass or less , 95.0% by mass or less, 92.0% by mass or less, or 90.0% by mass or less.

<Component (B): Amine compound>
In the lubricating oil composition of one embodiment of the present invention, the amine compound used as component (B) is one or more selected from hindered amine compounds (B1) and alkanolamine compounds (B2). In addition, component (B) satisfies at least one of the following requirements (I) and (II).
- Requirement (I): The content of component (B1) is 1.50% by mass or more and less than 3.50% by mass, based on the total amount of the lubricating oil composition.
- Requirement (II): The content of component (B2) is 2.20% by mass or more based on the total amount of the lubricating oil composition.

Since the lubricating oil composition of one embodiment of the present invention contains component (B) so as to satisfy at least one of the above requirements (I) and (II), long-drain properties can be significantly improved. In particular, even if water, which causes deterioration, is mixed in, long-drain properties can be maintained well.
Component (B) used in one aspect of the present invention may be used alone or in combination of two or more.

In the lubricating oil composition of one aspect of the present invention, the content of component (B) is adjusted to satisfy at least one of the above requirements (I) and (II), but the total amount of the lubricating oil composition ( 100% by mass), preferably 1.50% by mass or more, more preferably 1.70% by mass or more, more preferably from the viewpoint of providing a lubricating oil composition with better long drain properties even when water is mixed. is 2.00% by mass or more, more preferably 2.10% by mass or more, even more preferably 2.20% by mass or more, even more preferably 2.50% by mass or more, particularly preferably 2.70% by mass or more. Also, from the viewpoint of providing a lubricating oil composition with good high-temperature cleanliness, preferably 10.0% by mass or less, more preferably 9.5% by mass or less, more preferably 9.0% by mass or less, and even more preferably is 8.5% by mass or less, more preferably 8.0% by mass or less, even more preferably 7.5% by mass or less, particularly preferably 7.0% by mass or less, furthermore, 6.5% by mass or less, It may be 6.0% by mass or less, 5.5% by mass or less, 5.0% by mass or less, 4.5% by mass or less, 4.0% by mass or less, or less than 3.5% by mass.

上記式中、＊１及び＊２は、他の原子との結合位置を示す。 <Component (B1): Hindered amine compound>
In one embodiment of the present invention, the hindered amine compound used as component (B1) may be any compound containing a structure represented by the following formula (b1-0).

In the above formula, *1 and *2 indicate bonding positions with other atoms.

Component (B1) used in one embodiment of the present invention is 1 selected from a compound (B11) represented by the following general formula (b1-1) and a compound (B12) represented by the following general formula (b1-2). It is preferable to include more than one species.

In the above general formulas (b1-1) and (b1-2), R ^b1 is each independently a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms.
In the above general formula (b1-1), R ^b2 is a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 18 ring carbon atoms, an aryl group having 6 to 18 ring carbon atoms, or a hydroxyl group. , an amino group, or a group represented by -O-CO-R ^b3 (R ^b3 is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms).
In the above general formula (b1-2), Z is an alkylene group having 1 to 20 carbon atoms, a cycloalkylene group having 3 to 18 ring carbon atoms, an arylene group having 6 to 18 ring carbon atoms, an oxygen atom, or a sulfur atom. , or a group represented by -O-CO-(CH ₂ ) _n -CO-O- (n is an integer of 1 to 20).

Examples of the alkyl group that can be selected as R ^b1 include methyl group, ethyl group, propyl group (n-propyl group, isopropyl group), butyl group (n-butyl group, s-butyl group, t-butyl group). , isobutyl group), pentyl group, hexyl group, 2-ethylhexyl group, heptyl group, octyl group, nonyl group, decyl group, etc. The alkyl group may be a straight-chain alkyl group or a branched-chain alkyl group.
The number of carbon atoms in the alkyl group that can be selected as R ^b1 is preferably 1 to 10, more preferably 1 to 6, and still more preferably 1 to 3.

Examples of the alkoxy group that can be selected as R ^b1 include methoxy group, ethoxy group, propoxy group (n-propoxy group, isopropoxy group), butoxy group (n-butoxy group, s-butoxy group, t-butoxy group). group, isobutoxy group), pentyloxy group, hexyloxy group, 2-ethylhexyloxy group, heptyloxy group, octyloxy group, nonyloxy group, decyloxy group, -(CH ₂ ) _n - (n is 1 -20 integers), etc. The alkoxy group may be a straight-chain alkoxy group or a branched-chain alkoxy group.
The number of carbon atoms in the alkoxy group that can be selected as R ^b1 is preferably 1 to 10, more preferably 1 to 6, and still more preferably 1 to 3.

Examples of the alkyl group that can be selected as R ^b2 include, in addition to the above-mentioned alkyl groups having 1 to 10 carbon atoms that can be selected as R ^b1 , for example, undecyl group, dodecyl group, tridecyl, tetradecyl group, hexadecyl group, octadecyl group. Examples include groups. The alkyl group may be a straight-chain alkyl group or a branched-chain alkyl group.
The number of carbon atoms in the alkyl group that can be selected as R ^b2 is preferably 1 to 20, more preferably 3 to 18, still more preferably 6 to 16, even more preferably 8 to 14.

Examples of the cycloalkyl group that can be selected as R ^b2 include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, and an adamantyl group.
The number of ring carbon atoms in the cycloalkyl group that can be selected as R ^b2 is preferably 3 to 18, more preferably 5 to 15, and still more preferably 6 to 12.

Examples of the aryl group that can be selected as R ^b2 include a phenyl group, a naphthyl group, an anthryl group, a phenanthryl group, a biphenyl group, a terphenyl group, a phenylnaphthyl group, and the like.
The number of ring carbon atoms in the aryl group that can be selected as R ^b2 is preferably 6 to 18, more preferably 6 to 15, and still more preferably 6 to 12.

Examples of the alkylene group that can be selected as Z include methylene group, 1,1-ethylene group, 1,2-ethylene group, 1,3-propylene, 1,2-propylene, 2,2-propylene, etc. Various propylene groups, various butylene groups, various pentylene groups, various hexylene groups, various heptylene groups, various octylene groups, various nonylene groups, various decylene groups, various undecylene groups, various dodecylene groups, various tridecylene groups, various tetradecylene groups, various Examples include pentadecylene groups, various hexadecylene groups, various heptadecylene groups, and various octadecylene groups.
Examples of the cycloalkylene group that can be selected as Z include a cyclopropylene group, a cyclobutylene group, a cyclopentylene group, a cyclohexylene group, a cycloheptylene group, a cyclooctylene group, and an adamantylene group.
Examples of the arylene group that can be selected as Z include a phenylene group, a naphthylene group, an anthrylene group, a phenanthrylene group, a biphenylene group, and a terphenylene group.

Component (B1) used in one aspect of the present invention is a compound (B11-1) represented by the following general formula (b1-1-1) and a compound (B11-1) represented by the following general formula (b1-2-1) ( It is more preferable to include one or more selected from B12-1).

In the above general formulas (b1-1-1) and (b1-2-1), R ^b1 is each independently a hydrogen atom or an alkyl group having 1 to 10 carbon atoms. Specific examples of the alkyl group that can be selected as R ^b1 and the preferred range of the number of carbon atoms are as described above.
In the above general formula (b1-1-1), R ^b3 is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms.
In the above general formula (b1-2-1), n is an integer of 1 to 20.

The hydrocarbon group that can be selected as R ^b3 includes a ring-forming carbon group optionally substituted with an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, and an alkyl group having 1 to 10 carbon atoms. Examples include a cycloalkyl group having 3 to 18 carbon atoms, an aryl group having 6 to 18 ring carbon atoms which may be substituted with an alkyl group having 1 to 10 carbon atoms, and an arylalkyl group having 7 to 19 carbon atoms.
Note that the alkyl group may be a straight-chain alkyl group or a branched-chain alkyl group. Further, the alkenyl group may be a straight chain alkenyl group or a branched chain alkenyl group.

Examples of the alkyl group, cycloalkyl group, and aryl group that can be selected as R ^b3 include the same groups as the alkyl group, cycloalkyl group, and aryl group that can be selected as R ^b2 .
Examples of the alkenyl group that can be selected as R ^b3 include ethenyl group (vinyl group), propenyl group, butenyl group, pentenyl group, hexenyl group, heptenyl group, octenyl group, nonenyl group, decenyl group, dodecenyl group. , tridecenyl group, tetradecenyl group, pentadecenyl group, hexadecenyl group, octadecenyl group (oleyl group), and the like.
Examples of the arylalkyl group that can be selected as R ^b3 include phenylmethyl group, phenylethyl group, naphthylmethyl group, naphthylethyl group, and the like.

Among these, R ^b3 is preferably an alkyl group having 1 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms, and more preferably an alkyl group having 1 to 20 carbon atoms.
The number of carbon atoms in the alkyl group that can be selected as R ^b3 is preferably 3 to 20, more preferably 4 to 18, still more preferably 6 to 16, even more preferably 8 to 14.
The alkenyl group that can be selected as R ^b3 preferably has 2 to 20 carbon atoms, more preferably 3 to 18 carbon atoms, and still more preferably 6 to 16 carbon atoms.

The component (B1) used in one aspect of the present invention includes at least the compound (B11) represented by the general formula (b1-1) from the viewpoint of providing a lubricating oil composition with further improved high-temperature cleanliness. is preferred, and more preferably contains at least the compound (B11-1) represented by the general formula (b1-1-1).
In the lubricating oil composition of one aspect of the present invention, the content ratio of component (B11) or (B11-1) in component (B1) is the total amount (100 mass) of component (B1) contained in the lubricating oil composition. %), from the viewpoint of obtaining a lubricating oil composition with improved high-temperature cleanliness, preferably 40 to 100% by mass or more, more preferably 50 to 100% by mass, more preferably 60 to 100% by mass, and even more It is preferably 70 to 100% by weight, more preferably 80 to 100% by weight, even more preferably 90 to 100% by weight, particularly preferably 95 to 100% by weight.

In the lubricating oil composition of one embodiment of the present invention, the content of component (B1) is 1.50% by mass or more based on the total amount (100% by mass) of the lubricating oil composition, as described in requirement (I) above. It is less than 3.5% by mass. When containing component (B1), if the content of component (B1) is less than 1.50% by mass, it becomes difficult to sufficiently improve long drain properties even if water is mixed. Moreover, when containing component (B1), if the content of component (B1) is more than 3.5% by mass, there is a concern that high-temperature cleanliness may deteriorate.

From the above viewpoint, in the lubricating oil composition of one aspect of the present invention, the content of component (B1) is preferably 1.60% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition, and more preferably Preferably 1.70% by mass or more, more preferably 2.00% by mass or more, still more preferably 2.10% by mass or more, even more preferably 2.20% by mass or more, even more preferably 2.50% by mass or more, Particularly preferably 2.70% by mass or more, preferably 3.4% by mass or less, more preferably 3.3% by mass or less, more preferably 3.2% by mass or less, even more preferably 3.1% by mass. % or less, even more preferably 3.0% by mass or less, particularly preferably less than 3.0% by mass.

In the lubricating oil composition of one embodiment of the present invention, the content of component (B1) in terms of nitrogen atoms is based on the total amount (100% by mass) of the lubricating oil composition, and further improves high-temperature cleanliness, From the viewpoint of providing a lubricating oil composition with better long-drain properties even when water is mixed in, it is preferably 0.070% by mass or more, more preferably 0.080% by mass or more, and still more preferably 0.090% by mass or more. , even more preferably 0.100% by mass or more, particularly preferably 0.110% by mass or more, and from the viewpoint of providing a lubricating oil composition that can better maintain high-temperature cleanliness, preferably 0.144% by mass. It is less than 0.142% by weight, even more preferably 0.140% by weight, even more preferably 0.138% by weight, particularly preferably 0.135% by weight.

In the lubricating oil composition of one embodiment of the present invention, component (C) and component ( The content ratio [(C)/(B1)] with B1) is preferably 0.10 or more, more preferably 0.30 or more, more preferably 0.50 or more, still more preferably 0. 55 or more, more preferably 0.60 or more, even more preferably 0.65 or more, particularly preferably 0.70 or more, and preferably 7.00 or less, more preferably 5.00 or less, more preferably It is 4.00 or less, more preferably 2.00 or less, even more preferably 1.00 or less, even more preferably 0.90 or less, even more preferably 0.85 or less, particularly preferably 0.80 or less.

<Component (B2): Alkanolamine compound>
In one embodiment of the present invention, the alkanolamine used as component (B2) may be any compound represented by any of the following general formulas (b2-1) to (b2-3).

In the above formula, A ^b1 to A ^b3 are each independently an alkylene group.
R ^b11 and R ^b12 are each independently a hydrogen atom or a hydrocarbon group.

Examples of the alkylene group that can be selected as A ^b1 to A ^b3 include methylene group, 1,1-ethylene group, 1,2-ethylene group, 1,3-propylene, 1,2-propylene, 2,2 - Various propylene groups such as propylene, various butylene groups, various pentylene groups, various hexylene groups, various heptylene groups, various octylene groups, various nonylene groups, various decylene groups, various undecylene groups, various dodecylene groups, various tridecylene groups, various Examples include a tetradecylene group, various pentadecylene groups, various hexadecylene groups, various heptadecylene groups, and various octadecylene groups.
The alkylene group may be a straight chain alkylene group or a branched chain alkylene group.
The alkylene group preferably has 1 to 20 carbon atoms, more preferably 1 to 15 carbon atoms, still more preferably 1 to 10 carbon atoms, even more preferably 1 to 6 carbon atoms, and particularly preferably 2 to 4 carbon atoms.
Among these, the alkylene group that can be selected as A ^b1 to A ^b3 is preferably a group represented by -(CH ₂ ) _m - (m is an integer of 1 to 10). Note that m is preferably an integer of 1 to 15, more preferably an integer of 1 to 10, still more preferably an integer of 1 to 6, even more preferably an integer of 2 to 4, particularly preferably 2.

Examples of the hydrocarbon group that can be selected as R ^b11 and R ^b12 include methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group. linear or branched alkyl groups such as dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group; octenyl group, nonenyl group, decenyl group, undecenyl group, dodecenyl group, tridecenyl group , linear or branched alkenyl groups such as tetradecenyl group, pentadecenyl group; cyclohexyl group, dimethylcyclohexyl group, ethylcyclohexyl group, methylcyclohexylmethyl group, cyclohexylethyl group, propylcyclohexyl group, butylcyclohexyl group, heptylcyclohexyl group, etc. Cycloalkyl group; Aryl group such as phenyl group, naphthyl group, anthracenyl group, biphenyl group, terphenyl group; Alkylaryl group such as tolyl group, dimethylphenyl group, butylphenyl group, nonylphenyl group, methylbenzyl group, dimethylnaphthyl group, etc. Groups include arylalkyl groups such as phenylmethyl, phenylethyl, and diphenylmethyl groups.
The hydrocarbon group preferably has 1 to 20 carbon atoms, more preferably 1 to 15 carbon atoms, and still more preferably 1 to 10 carbon atoms.

The component (B2) used in one aspect of the present invention preferably contains at least dialkanolamine (B21) from the viewpoint of providing a lubricating oil composition with better long drain properties even when water is mixed in.
Examples of the dialkanolamine (B21) include compounds represented by the general formula (b2-2), but it is more preferable to include diethanolamine (B21-1).

In the lubricating oil composition of one aspect of the present invention, the content ratio of component (B21) or (B21-1) in component (B2) is the total amount (100 mass) of component (B2) contained in the lubricating oil composition. %), from the viewpoint of providing a lubricating oil composition with improved long drain properties, preferably 40 to 100% by mass, more preferably 50 to 100% by mass, more preferably 60 to 100% by mass, and even more preferably is 70 to 100% by weight, more preferably 80 to 100% by weight, even more preferably 90 to 100% by weight, particularly preferably 95 to 100% by weight.

In the lubricating oil composition of one embodiment of the present invention, the content of component (B2) is 2.20% by mass or more based on the total amount (100% by mass) of the lubricating oil composition, as described in requirement (II) above. It is. When containing component (B2), if the content of component (B2) is less than 2.20% by mass, it becomes difficult to sufficiently improve long drain properties even if water is mixed.

From the above viewpoint, in the lubricating oil composition of one aspect of the present invention, the content of component (B2) is preferably 2.30% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition, and more preferably Preferably 2.50% by mass or more, more preferably 2.60% by mass or more, more preferably 2.70% by mass or more, more preferably 2.80% by mass or more, still more preferably 3.00% by mass or more, and Preferably 3.30% by mass or more, more preferably 3.50% by mass or more, still more preferably 3.70% by mass or more, even more preferably 3.90% by mass or more, particularly preferably 4.00% by mass or more. be.

In addition, in the lubricating oil composition of one embodiment of the present invention, there is no particular upper limit for the content of component (B2), but since high-temperature cleanliness can be maintained favorably, the lubricating oil composition can maintain high-temperature cleanliness better. From the viewpoint of forming an oil composition, preferably 10.0% by mass or less, more preferably 8.0% by mass or less, more preferably 7.0% by mass or less, even more preferably 6.0% by mass or less, even more preferably is 5.5% by mass or less, particularly preferably 5.0% by mass or less.

In the lubricating oil composition of one embodiment of the present invention, component (C) and component ( The content ratio [(C)/(B2)] with B1) is preferably 0.10 or more, more preferably 0.20 or more, more preferably 0.30 or more, still more preferably 0. 35 or more, more preferably 0.40 or more, even more preferably 0.45 or more, particularly preferably 0.50 or more, and preferably 7.00 or less, more preferably 5.00 or less, more preferably It is 4.00 or less, more preferably 2.00 or less, even more preferably 1.00 or less, even more preferably 0.90 or less, even more preferably 0.85 or less, particularly preferably 0.80 or less.

<Component (C): Neutral metal salicylate>
The lubricating oil composition of one embodiment of the present invention contains a neutral metal salicylate having a base number of 0 to 100 mg KOH/g as component (B).
When used in combination with component (B), component (C) can improve high-temperature cleanliness and provide a lubricating oil composition with better long-drain properties even when water is mixed in.
In one embodiment of the present invention, component (C) may be used alone or in combination of two or more.

The metal atoms constituting component (C) used in one aspect of the present invention include alkali metals and alkaline earth metals, preferably sodium, calcium, magnesium, or barium, and more preferably calcium.

Examples of the component (C) used in one embodiment of the present invention include a compound represented by the following general formula (c-1).

In the above general formula (c-1), R ^C is a hydrogen atom or a hydrocarbon group having 1 to 18 carbon atoms.
Examples of the hydrocarbon group that can be selected as R ^C include an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 18 ring carbon atoms, and a cycloalkyl group having 6 to 18 ring carbon atoms. Examples include an aryl group having 18 carbon atoms, an alkylaryl group having 7 to 18 carbon atoms, and an arylalkyl group having 7 to 18 carbon atoms.
M is a metal atom, preferably an alkali metal or an alkaline earth metal, more preferably sodium, calcium, magnesium, or barium, and even more preferably calcium.
p is the valence of the metal atom M.

Component (B) used in the present invention is at least one overbased calcium detergent selected from calcium salicylate (B1) and calcium phenate (B2).
A lubricating oil composition containing at least one selected from components (B1) and (B2) as an overbased calcium detergent, which has the effect of suppressing premature ignition and has improved long drain properties. It can be done.

The "neutral" metallic detergent used as component (C) in one embodiment of the present invention means a metallic detergent with a base number of 0 to 100 mgKOH/g or more, and a neutral detergent with a base number of more than 100 mgKOH/g. Distinguished from basic metal detergents.
The base number of component (C) used in one aspect of the present invention may be 100 mgKOH/g or less, but 90 mgKOH/g or less, 80 mgKOH/g or less, 70 mgKOH/g or less, 60 mgKOH/g or less, 50 mgKOH/g or less , 40mgKOH/g or less, 30mgKOH/g or less, 20mgKOH/g or less, 15mgKOH/g or less, or 10mgKOH/g or less, and 0mgKOH/g or more, more than 0mgKOH/g, 1mgKOH/g or more, 5mgKOH/g or more, or 10 mgKOH/g or more.

Component (B) used in one embodiment of the present invention is used in combination with component (B) from the viewpoint of improving high-temperature cleanliness and providing a lubricating oil composition with better long drain properties even when water is mixed in. ) preferably contains a neutral calcium salicylate (C1) having a base value of 0 to 100 mgKOH/g.
From the above viewpoint, in the lubricating oil composition of one embodiment of the present invention, the content ratio of component (C1) in component (C) is the total amount (100% by mass) of component (C) contained in the lubricating oil composition. Based on the standard, preferably 40 to 100% by mass or more, more preferably 50 to 100% by mass, more preferably 60 to 100% by mass, even more preferably 70 to 100% by mass, even more preferably 80 to 100% by mass, and even more It is preferably 90 to 100% by weight, particularly preferably 95 to 100% by weight.

In the lubricating oil composition of one embodiment of the present invention, when used in combination with component (B), the lubricating oil composition can improve high-temperature cleanliness and have better long-drain properties even when water is mixed in. Therefore, the content of component (C) is preferably 0.10% by mass or more, more preferably 0.30% by mass or more, more preferably 0.30% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition. 50% by mass or more, more preferably 0.70% by mass or more, even more preferably 1.00% by mass or more, even more preferably 1.20% by mass or more, even more preferably 1.50% by mass or more, even more preferably 1 .70% by mass or more, particularly preferably 1.90% by mass or more, and preferably 10.0% by mass or less, more preferably 8.0% by mass or less, more preferably 7.0% by mass or less, and Preferably it is 6.0% by mass or less, even more preferably 5.0% by mass or less, particularly preferably 4.0% by mass or less.

In the lubricating oil composition of one embodiment of the present invention, when used in combination with component (B), the lubricating oil composition can improve high-temperature cleanliness and have better long-drain properties even when water is mixed in. Therefore, the content of component (C) in terms of calcium atoms is preferably 50 mass ppm or more, more preferably 100 mass ppm or more, and more preferably 150 mass ppm or more, based on the total amount (100 mass %) of the lubricating oil composition. mass ppm or more, more preferably 200 mass ppm or more, still more preferably 250 mass ppm or more, still more preferably 300 mass ppm or more, even more preferably 350 mass ppm or more, even more preferably 400 mass ppm or more, particularly preferably 450 mass ppm ppm or more, and preferably 3000 mass ppm or less, more preferably 2500 mass ppm or less, more preferably 2000 mass ppm or less, still more preferably 1500 mass ppm or less, even more preferably 1000 mass ppm or less, particularly preferably It is 800 mass ppm or less.

<Metallic cleaners other than component (C)>
The lubricating oil composition of one embodiment of the present invention may further contain a metal detergent other than component (C) within a range that does not impair the effects of the present invention, and may further contain a metal detergent other than component (C). It is not necessary to contain a system detergent.

Examples of metal detergents other than component (C) include overbased metal salicylates, neutral or overbased metal sulfonates, and neutral or overbased metal phenates.
Note that "overbased" means that the base number is more than 100 mgKOH/g, and "neutral" means that the base number is 0 to 100 mgKOH/g.
Examples of the metal atoms constituting the metal-based detergent include alkali metals and alkaline earth metals.

However, if a metal-based detergent other than component (C) is used together with component (B), there is a risk that long-drain properties may be degraded when water is mixed. Moreover, especially when an overbased metal sulfonate is used, not only the long drain property but also the high temperature cleanliness may be reduced.
Therefore, it is preferable that the content of metal-based detergents other than component (C) is as small as possible, and it is more preferable that they are substantially not contained.
In this specification, the phrase "does not substantially contain metal-based detergents other than component (C)" is a provision that negates the mode of blending and containing the metal-based detergent for a predetermined purpose. However, this provision does not negate situations in which the metal-based detergent is mixed in or present unintentionally or unavoidably.

In the lubricating oil composition of one aspect of the present invention, the content of metal-based detergents other than component (C) is preferably less than 0.01% by mass based on the total amount (100% by mass) of the lubricating oil composition. , more preferably less than 0.001% by mass, still more preferably less than 0.0001% by mass.

In the lubricating oil composition of one aspect of the present invention, the content of the metal detergent other than component (C) is preferably based on 100 parts by mass of the total amount of component (C) contained in the lubricating oil composition. Less than 10 parts by weight, more preferably less than 5 parts by weight, more preferably less than 1 part by weight, even more preferably less than 0.1 part by weight, even more preferably less than 0.01 part by weight, even more preferably 0.001 part by weight. less than 0.0001 part by mass, particularly preferably less than 0.0001 part by mass.

<Component (D): Antioxidant that does not fall under component (B)>
The lubricating oil composition of one embodiment of the present invention includes an antioxidant that does not fall under component (B) as component (D) from the viewpoint of providing a lubricating oil composition with further improved high-temperature cleanliness and long-drain property. May contain.
Examples of the component (D) used in one embodiment of the present invention include amine antioxidants other than hindered amine compounds, phenolic antioxidants, sulfur antioxidants, phosphorus antioxidants, and the like.
In one embodiment of the present invention, component (D) may be used alone or in combination of two or more.

Component (D) used in one aspect of the present invention preferably contains one or more selected from amine antioxidants (D1) and phenolic antioxidants (D2) that do not fall under component (B), It is more preferable to include both component (D1) and component (D2).

The total content of components (D1) and (D2) in component (D) used in one aspect of the present invention is preferably based on the total amount (100% by mass) of component (D) contained in the lubricating oil composition. is 60 to 100% by mass, more preferably 70 to 100% by mass, more preferably 80 to 100% by mass, even more preferably 85 to 100% by mass, even more preferably 90 to 100% by mass, particularly preferably 95 to 100% by mass. Mass%.

When component (D) used in one embodiment of the present invention contains both components (D1) and (D2), the content ratio of component (D1) and component (D2) [(D1)/(D2)] is a mass ratio, preferably 0.10 to 5.0, more preferably 0.30 to 4.5, more preferably 0.50 to 4.0, even more preferably 0.75 to 3.5, More preferably 1.0 to 3.0, particularly preferably 1.2 to 2.7.

The component (D1) used in one embodiment of the present invention includes, for example, diphenylamine-based oxidized diphenylamine such as diphenylamine, alkylated diphenylamine having an alkyl group having 3 to 20 carbon atoms (preferably 6 to 16 carbon atoms, and more preferably 8 to 12 carbon atoms). Inhibitor: α-naphthylamine, phenyl-α-naphthylamine, alkyl-substituted phenyl-α-naphthylamine in which an alkyl group having 3 to 20 carbon atoms (preferably 6 to 16, more preferably 8 to 12) is substituted with a phenyl group, etc. naphthylamine-based antioxidant; and the like.

Examples of the component (D2) used in one embodiment of the present invention include 2,6-di-t-butylphenol, 2,6-di-t-butyl-4-methylphenol, 2,6-di-t-butylphenol, and 2,6-di-t-butylphenol. -4-ethylphenol, isooctyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, Monophenolic antioxidants such as benzenepropanoic acid-3,5-bis(1,1-dimethylethyl)-4-hydroxyalkyl ester; 4,4'-methylenebis(2,6-di-t-butylphenol); Diphenolic antioxidants such as 2,2'-methylenebis(4-ethyl-6-t-butylphenol) and thiodiethylenebis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] ; etc.

In the lubricating oil composition of one embodiment of the present invention, the content of component (D) is preferably 0.01% by mass or more, more preferably 0.01% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition. 05% by mass or more, more preferably 0.10% by mass or more, even more preferably 0.30% by mass or more, even more preferably 0.50% by mass or more, even more preferably 0.70% by mass or more, particularly preferably 1 .00 mass% or more, and 10.0 mass% or less, 8.0 mass% or less, 6.0 mass% or less, 5.0 mass% or less, 4.0 mass% or less, 3.0 mass% It may be less than or equal to 2.0% by mass.

In the lubricating oil composition of one embodiment of the present invention, the ratio [(D)/(B)] between component (D) and component (B) is preferably 0.10 or more, more preferably 0. .15 or more, more preferably 0.20 or more, even more preferably 0.25 or more, particularly preferably 0.30 or more, and preferably 6.0 or less, more preferably 5.0 or less, more preferably is 4.0 or less, more preferably 3.0 or less, even more preferably 2.0 or less, even more preferably 1.0 or less, even more preferably 0.90 or less, particularly preferably 0.80 or less.

In the lubricating oil composition of one embodiment of the present invention, the content of component (D1) is preferably 0.01% by mass or more, more preferably 0.01% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition. 05% by mass or more, more preferably 0.10% by mass or more, even more preferably 0.20% by mass or more, even more preferably 0.30% by mass or more, even more preferably 0.50% by mass or more, particularly preferably 0 The content may be .70% by mass or more, and may also be 5.0% by mass or less, 4.0% by mass or less, 3.0% by mass or less, 2.0% by mass or less, or 1.5% by mass or less.

In the lubricating oil composition of one aspect of the present invention, the content of component (D2) is preferably 0.01% by mass or more, more preferably 0.01% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition. 05% by mass or more, more preferably 0.10% by mass or more, even more preferably 0.20% by mass or more, even more preferably 0.30% by mass or more, particularly preferably 0.40% by mass or more, and It may be 5.0% by mass or less, 4.0% by mass or less, 3.0% by mass or less, 2.0% by mass or less, or 1.0% by mass or less.

<Component (E): Imide compound>
The lubricating oil composition of one embodiment of the present invention may contain an imide compound as component (E). By containing component (E), a lubricating oil composition that can suppress sludge precipitation can be obtained.
In one embodiment of the present invention, component (E) may be used alone or in combination of two or more.

（上記式中、＊は結合位置を示す。） As used herein, "imide compound" means a compound having an imide structure represented by the following formula (e-0), and includes a chain compound having the imide structure and a cyclic compound having the imide structure. Also included.

(In the above formula, * indicates the bonding position.)

Component (E) used in one embodiment of the present invention is a modified imide compound reacted with one or more selected from boron compounds, alcohols, aldehydes, ketones, alkylphenols, cyclic carbonates, epoxy compounds, organic acids, etc. Alternatively, it may be a non-modified imide compound.

Component (E) used in one aspect of the present invention preferably contains one or more selected from alkenyl succinimides and modified products thereof, including non-boron-modified alkenyl succinimides (E1) and boron-modified alkenyl succinimides. It is more preferable to contain one or more selected from (E2), and even more preferable to contain both components (E1) and (E2).

The total content of components (E1) and (E2) in component (E) used in one aspect of the present invention is preferably based on the total amount (100% by mass) of component (E) contained in the lubricating oil composition. is 60 to 100% by mass, more preferably 70 to 100% by mass, more preferably 80 to 100% by mass, even more preferably 85 to 100% by mass, even more preferably 90 to 100% by mass, particularly preferably 95 to 100% by mass. Mass%.

Examples of the non-boron-modified alkenyl succinimide (E1) include alkenyl succinic acid bisimide (E11) represented by the following general formula (e-1) and alkenyl succinic acid monoimide (E11) represented by the following general formula (e-2). One or more types selected from E12) are preferred.

In the above general formulas (e-1) and (e-2), R ^e1 , R ^e2 and R ^e3 are each independently an alkenyl group having a mass average molecular weight (Mw) of 500 to 3000 (preferably 900 to 2500). It is.
Examples of the alkenyl group that can be selected as R ^e1 , R ^e2 and R ^e3 include a polybutenyl group, a polyisobutenyl group, an ethylene-propylene copolymer, and among these, a polybutenyl group or a polyisobutenyl group is preferred.
A ^e1 , A ^e2 and A ^e3 are each independently an alkylene group having 2 to 5 carbon atoms.
z1 is an integer of 0 to 10, preferably an integer of 1 to 4, more preferably 2 or 3.
z2 is an integer of 1 to 10, preferably an integer of 2 to 5, more preferably 3 or 4.

Examples of the boron-modified alkenylsuccinimide (E2) used in one embodiment of the present invention include a boron-modified alkenylsuccinimide bisimide represented by the general formula (e-1), and the following general formula (e-1). Examples include boron-modified alkenylsuccinic acid monoimide represented by 2).

In one embodiment of the present invention, the ratio [B/N] of boron atoms and nitrogen atoms constituting component (E2) is preferably 0.1 or more, more preferably 0.2 or more, and even more preferably 0.3. Above, it is more preferably 0.5 or more, still more preferably 0.7 or more, even more preferably 0.9 or more, particularly preferably 1.0 or more.

In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of high temperature cleanliness, the content ratio [(E1)/(E2)] of component (E1) and component (E2) is preferably 0 in terms of mass ratio. .10 or more, more preferably 0.50 or more, even more preferably 0.70 or more, even more preferably 1.00 or more, particularly preferably 1.20 or more, and preferably less than 5.00, more preferably is less than 4.00, more preferably less than 3.00, even more preferably less than 2.50, particularly preferably less than 2.00.

In the lubricating oil composition of one embodiment of the present invention, the content ratio [B/N] of boron atoms derived from component (E2) and nitrogen atoms derived from component (E) is preferably 0.01 or more, more preferably 0.05 or more, still more preferably 0.10 or more, even more preferably 0.20 or more, particularly preferably 0.30 or more, and preferably 0.90 or more, It is preferably 0.80 or less, more preferably 0.70 or less, even more preferably 0.60 or less, particularly preferably 0.55 or less.

In the lubricating oil composition of one aspect of the present invention, the content of component (E) is preferably 0.50% by mass or more, more preferably 1.5% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition. 0% by mass or more, more preferably 2.0% by mass or more, even more preferably 3.0% by mass or more, particularly preferably 4.0% by mass or more, and preferably 12.0% by mass or less, more preferably Preferably it is 10.0% by mass or less, more preferably 9.0% by mass or less, even more preferably 8.5% by mass or less, particularly preferably 8.0% by mass or less.

In the lubricating oil composition of one aspect of the present invention, the content of component (E) in terms of nitrogen atoms is preferably 0.010 to 0.200 based on the total amount (100% by mass) of the lubricating oil composition. % by mass, more preferably 0.020-0.170% by mass, even more preferably 0.030-0.130% by mass, even more preferably 0.040-0.100% by mass, particularly preferably 0.050-0.050% by mass. It is 0.090% by mass.

In the lubricating oil composition of one aspect of the present invention, the content of component (E1) is preferably 0.50% by mass or more, more preferably 1.5% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition. 0% by mass or more, more preferably 2.0% by mass or more, even more preferably 3.0% by mass or more, particularly preferably 4.0% by mass or more, and preferably 12.0% by mass or less, more preferably Preferably it is 10.0% by mass or less, more preferably 9.0% by mass or less, even more preferably 8.5% by mass or less, particularly preferably 8.0% by mass or less.

In the lubricating oil composition of one aspect of the present invention, the content of component (E1) in terms of nitrogen atoms is preferably 0.005 to 0.150 based on the total amount (100% by mass) of the lubricating oil composition. mass%, more preferably 0.010 to 0.120 mass%, still more preferably 0.015 to 0.100 mass%, even more preferably 0.020 to 0.080 mass%, particularly preferably 0.025 to 0.025 mass% It is 0.070% by mass.

In the lubricating oil composition of one aspect of the present invention, the content of component (E2) is preferably 0.50% by mass or more, more preferably 1.5% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition. 0% by mass or more, more preferably 2.0% by mass or more, even more preferably 3.0% by mass or more, particularly preferably 4.0% by mass or more, and preferably 12.0% by mass or less, more preferably Preferably it is 10.0% by mass or less, more preferably 9.0% by mass or less, even more preferably 8.5% by mass or less, particularly preferably 8.0% by mass or less.

In the lubricating oil composition of one aspect of the present invention, the content of component (E2) in terms of boron atoms is preferably 0.001 to 0.100 based on the total amount (100% by mass) of the lubricating oil composition. % by mass, more preferably 0.005-0.090% by mass, even more preferably 0.010-0.080% by mass, even more preferably 0.015-0.070% by mass, particularly preferably 0.020-0.020% by mass. It is 0.060% by mass.

<Component (F): Zinc dithiophosphate>
The lubricating oil composition of one embodiment of the present invention may contain zinc dithiophosphate (ZnDTP) as component (F). By containing component (E), a lubricating oil composition with improved wear resistance can be obtained.
In one aspect of the present invention, component (F) may be used alone or in combination of two or more.

Component (F) used in one embodiment of the present invention is preferably a compound represented by the following general formula (f-1).

In the above formula (f-1), R ^f1 to R ^f4 each independently represent a hydrocarbon group, and may be the same or different from each other.
The number of carbon atoms in the hydrocarbon group that can be selected as R ^f1 to R ^f4 is preferably 1 to 20, more preferably 1 to 16, still more preferably 3 to 12, even more preferably 3 to 10.

Specific hydrocarbon groups that can be selected as R ^f1 to R ^f4 include, for example, methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group. Alkyl groups such as undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group; octenyl group, nonenyl group, decenyl group, undecenyl group, dodecenyl group, tridecenyl group, tetradecenyl group , alkenyl groups such as pentadecenyl group; cycloalkyl groups such as cyclohexyl group, dimethylcyclohexyl group, ethylcyclohexyl group, methylcyclohexylmethyl group, cyclohexylethyl group, propylcyclohexyl group, butylcyclohexyl group, heptylcyclohexyl group; phenyl group, naphthyl group , anthracenyl group, biphenyl group, terphenyl group; alkylaryl group such as tolyl group, dimethylphenyl group, butylphenyl group, nonylphenyl group, methylbenzyl group, dimethylnaphthyl group; phenylmethyl group, phenylethyl group , arylalkyl groups such as diphenylmethyl group, and the like.
Among these, the hydrocarbon group that can be selected as R ^f1 to R ^f4 is preferably an alkyl group, more preferably a primary or secondary alkyl group, and even more preferably a secondary alkyl group.

In the lubricating oil composition of one aspect of the present invention, the content of component (F) is preferably 0.01% by mass or more, more preferably 0.01% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition. 05% by mass or more, more preferably 0.10% by mass or more, even more preferably 0.30% by mass or more, even more preferably 0.50% by mass or more, particularly preferably 0.70% by mass or more, and Preferably 10.0% by mass or less, more preferably 8.0% by mass or less, more preferably 5.0% by mass or less, even more preferably 4.0% by mass or less, even more preferably 3.0% by mass or less, Particularly preferably, it is 2.0% by mass or less.

In the lubricating oil composition of one aspect of the present invention, the content of component (F) in terms of zinc atoms is preferably 0.001% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition, More preferably 0.005% by mass or more, more preferably 0.01% by mass or more, even more preferably 0.03% by mass or more, even more preferably 0.05% by mass or more, particularly preferably 0.06% by mass or more. Also, preferably 1.0% by mass or less, more preferably 0.70% by mass or less, even more preferably 0.50% by mass or less, even more preferably 0.30% by mass or less, particularly preferably 0. It is 20% by mass or less.

<Component (G): Organic molybdenum compound>
The lubricating oil composition of one embodiment of the present invention may contain an organic molybdenum compound (G). By containing component (G), it is possible to obtain a lubricating oil composition with further improved friction reduction effect.
In one embodiment of the present invention, component (G) may be used alone or in combination of two or more.

Examples of the component (G) used in one embodiment of the present invention include molybdenum dithiocarbamate (MoDTC), molybdenum dithiophosphate (MoDTP), and amine salts of molybtenic acid. It is preferable to include one or more selected from molybdenum acid (MoDTP) and molybdenum dithiocarbamate (MoDTC).
Component (D) may be used alone or in combination of two or more.

Molybdenum dithiophosphate (MoDTC) used in one embodiment of the present invention contains one or more compounds selected from the following general formula (g1-1) and the following general formula (g1-2): It is preferable.

In the above general formulas (g1-1) and (g1-2), R ^g1 to R ^g4 each independently represent a hydrocarbon group, and may be the same or different from each other.
X ¹ to X ⁸ each independently represent an oxygen atom or a sulfur atom, and may be the same or different. However, at least two of X ¹ to X ⁸ in formula (g1-1) are sulfur atoms.
In one aspect of the present invention, in the general formula (g1-1), it is preferable that X ¹ and X ² are oxygen atoms, and X ³ to X ⁸ are sulfur atoms. Further, in the general formula (g1-2), it is preferable that X ¹ and X ² are oxygen atoms, and X ³ and X ⁴ are sulfur atoms.

In the above general formula (g1-1), from the viewpoint of improving solubility, the molar ratio of sulfur atoms to oxygen atoms in X ¹ to X ⁸ [sulfur atoms/oxygen atoms] is preferably 1/4 to 4. /1, more preferably 1/3 to 3/1.
In the above general formula (g1-2), from the same viewpoint as above, the molar ratio of sulfur atoms to oxygen atoms in X ¹ to X ⁴ [sulfur atoms/oxygen atoms] is preferably 1/3 to 3/3. 1, more preferably 1.5/2.5 to 2.5/1.5.

Examples of molybdenum dithiocarbamate (MoDTC) include dinuclear molybdenum dithiocarbamate, which contains two molybdenum atoms in one molecule, and trinuclear molybdenum dithiocarbamate, which contains three molybdenum atoms in one molecule. Molybdenum dithiocarbamate is preferred.
The dinuclear molybdenum dithiocarbamate (MoDTC) used in one embodiment of the present invention is one type selected from a compound represented by the following general formula (g2-1) and a compound represented by the following general formula (g2-2). It is preferable to include the above.

In the above general formulas (g2-1) and (g2-2), R ^g11 to R ^g14 each independently represent a hydrocarbon group, and may be the same or different from each other.
X ¹¹ to X ¹⁸ each independently represent an oxygen atom or a sulfur atom, and may be the same or different.
However, at least one of X ¹¹ to X ¹⁸ in formula (g2-1) is a sulfur atom.
In one embodiment of the present invention, it is preferable that X ¹¹ and X ¹² in formula (g2-1) are oxygen atoms, and X ¹³ to X ¹⁸ are sulfur atoms.
Further, it is preferable that X ¹¹ to X ¹⁴ in formula (g2-2) are oxygen atoms.

In the above general formula (g2-1), from the viewpoint of improving solubility, the molar ratio of sulfur atoms to oxygen atoms in X ¹¹ to X ¹⁸ [sulfur atoms/oxygen atoms] is preferably 1/4 to 4. /1, more preferably 1/3 to 3/1.

Among the above general formulas (g1-1) and (g1-2), and the above general formulas (g2-1) and (g2-2), R ^g1 to R ^g4 and R ^g11 to R ^g14 can be selected. The hydrocarbon group preferably has 1 to 20 carbon atoms, more preferably 5 to 18 carbon atoms, still more preferably 5 to 16 carbon atoms, and even more preferably 5 to 12 carbon atoms.
Further, the hydrocarbon groups that can be selected from R ^g1 to R ^g4 and R ^g11 to R ^g14 include, for example, methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, etc. Alkyl groups such as isooctyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, isotridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group; octenyl group, nonenyl group, decenyl group , undecenyl group, dodecenyl group, tridecenyl group, tetradecenyl group, pentadecenyl group; alkenyl group such as cyclohexyl group, dimethylcyclohexyl group, ethylcyclohexyl group, methylcyclohexylmethyl group, cyclohexylethyl group, propylcyclohexyl group, butylcyclohexyl group, heptylcyclohexyl group Cycloalkyl groups such as phenyl, naphthyl, anthracenyl, biphenyl, terphenyl and other aryl groups; tolyl, dimethylphenyl, butylphenyl, nonylphenyl, methylbenzyl, dimethylnaphthyl, etc. alkylaryl groups; examples include arylalkyl groups such as phenylmethyl, phenylethyl, and diphenylmethyl groups;

In the lubricating oil composition of one embodiment of the present invention, the content of component (G) is such that the lubricating oil composition has a further improved friction reduction effect based on the total amount (100% by mass) of the lubricating oil composition. From this point of view, preferably 0.05% by mass or more, more preferably 0.10% by mass or more, even more preferably 0.20% by mass or more, even more preferably 0.30% by mass or more, particularly preferably 0.50% by mass. % or more, and 5.0 mass% or less, 4.0 mass% or less, 3.0 mass% or less, 2.0 mass% or less, 1.5 mass% or less, or 1.0 mass% or less Good too.

<Additives for lubricating oil>
The lubricating oil composition of one embodiment of the present invention may further contain lubricating oil additives other than components (B) to (G), as necessary, within a range that does not impair the effects of the present invention.
Examples of such lubricating oil additives include pour point depressants, viscosity index improvers, friction modifiers, antiwear agents, extreme pressure agents, metal deactivators, oil agents, rust preventives, and antifoaming agents. agents, etc.
These lubricating oil additives may be used alone or in combination of two or more.

The content of each of these lubricating oil additives can be adjusted as appropriate within a range that does not impair the effects of the present invention, but the content of each additive is based on the total amount (100% by mass) of the lubricating oil composition. The amount for each agent is usually 0.001 to 15% by weight, preferably 0.005 to 10% by weight, and more preferably 0.01 to 5% by weight.

[Pour point depressant]
The lubricating oil composition of one aspect of the present invention may further contain a pour point depressant. The pour point depressants may be used alone or in combination of two or more.
Examples of pour point depressants used in one embodiment of the present invention include ethylene-vinyl acetate copolymers, condensates of chlorinated paraffins and naphthalene, condensates of chlorinated paraffins and phenols, polymethacrylates, and polyalkylstyrenes. etc.
The mass average molecular weight (Mw) of the pour point depressant used in one aspect of the present invention is 5,000 or more, 7,000 or more, 10,000 or more, 15,000 or more, 20,000 or more, 25,000 or more, 30,000 or more, 35,000 or more, 40,000 or more, 45,000 or more, 50,000 or more, 55,000 or more, or 60,000 or more, and 150,000 or less, 120,000 or less , 100,000 or less, 90,000 or less, or 80,000 or less.

[Viscosity index improver]
The lubricating oil composition of one embodiment of the present invention may further contain a viscosity index improver. The viscosity index improvers may be used alone or in combination of two or more.
Examples of the viscosity index improver used in one embodiment of the present invention include non-dispersed polymethacrylate, dispersed polymethacrylate, olefin copolymer (e.g., ethylene-propylene copolymer, etc.), and dispersed olefin copolymer. Examples include polymers such as polymers, styrene copolymers (eg, styrene-diene copolymers, styrene-isoprene copolymers, etc.).
The weight average molecular weight (Mw) of the viscosity index improver used in one aspect of the present invention may be 5,000 or more, 7,000 or more, 10,000 or more, 15,000 or more, or 20,000 or more; , 1,000,000 or less, 700,000 or less, 500,000 or less, 300,000 or less, 200,000 or less, 100,000 or less, or 50,000 or less.

[Friction modifier and anti-wear agent]
The lubricating oil composition of one embodiment of the present invention may further contain a friction modifier or an antiwear agent. The friction modifier or anti-wear agent may be used alone or in combination of two or more.
Examples of friction modifiers and antiwear agents used in one embodiment of the present invention include sulfur-based compounds such as sulfurized olefins, dialkyl polysulfides, diarylalkyl polysulfides, and diaryl polysulfides; Phosphorous compounds such as acid esters, thiophosphoric acid esters, phosphite esters, alkyl hydrogen phosphites, phosphoric acid ester amine salts, phosphite ester amine salts; fatty acid esters, fatty acid amides, fatty acids, aliphatic alcohols, aliphatic ethers , urea compounds, hydrazide compounds, and other ashless friction modifiers.

[Extreme pressure agent]
The lubricating oil composition of one embodiment of the present invention may further contain an extreme pressure agent. The extreme pressure agent may be used alone or in combination of two or more.
Examples of the extreme pressure agent used in one embodiment of the present invention include sulfur-based compounds such as sulfurized olefins, dialkyl polysulfides, diarylalkyl polysulfides, and diaryl polysulfides, phosphoric acid esters, thiophosphoric acid esters, phosphorous esters, and alkyl hydrogen phosphites. , phosphoric acid ester amine salts, phosphorous acid ester amine salts, and the like.

[Metal deactivator]
The lubricating oil composition of one embodiment of the present invention may further contain a metal deactivator. The metal deactivators may be used alone or in combination of two or more.
Examples of the metal deactivator used in one embodiment of the present invention include benzotriazole, triazole derivatives, benzotriazole derivatives, thiadiazole derivatives, and the like.

[Oil-based agent]
The lubricating oil composition of one embodiment of the present invention may further contain an oily agent. The oily agents may be used alone or in combination of two or more.
Examples of the oily agent used in one embodiment of the present invention include aliphatic saturated and unsaturated monocarboxylic acids such as stearic acid and oleic acid, polymerized fatty acids such as dimer acid and hydrogenated dimer acid, ricinoleic acid, and 12-hydroxystearin. Hydroxy fatty acids such as acids; aliphatic saturated and unsaturated monoalcohols such as lauryl alcohol and oleyl alcohol; aliphatic saturated and unsaturated monoamines such as stearylamine and oleylamine; aliphatic saturated and unsaturated monoamines such as lauric acid amide and oleic acid amide. Examples include saturated monocarboxylic acid amides.

[anti-rust]
The lubricating oil composition of one embodiment of the present invention may further contain a rust inhibitor. The rust inhibitors may be used alone or in combination of two or more.
Examples of the rust preventive agent used in one embodiment of the present invention include fatty acids, alkenyl succinic acid half esters, fatty acid soaps, alkyl sulfonates, polyhydric alcohol fatty acid esters, fatty acid amines, oxidized paraffins, alkyl polyoxyethylene ethers, and the like. Can be mentioned.

[Defoaming agent]
The lubricating oil composition of one embodiment of the present invention may further contain an antifoaming agent. Antifoaming agents may be used alone or in combination of two or more.
Examples of the antifoaming agent used in one embodiment of the present invention include alkyl silicone antifoaming agents, fluorosilicone antifoaming agents, fluoroalkyl ether antifoaming agents, and the like.

<Method for producing lubricating oil composition>
The method for producing the lubricating oil composition of one embodiment of the present invention is not particularly limited, but from the viewpoint of productivity, the base oil (A) may be added to the above-mentioned components (B) and (C) as necessary. Preferably, the method includes a step of blending components (D) to (G) and other lubricating oil additives.

[Properties of lubricating oil composition]
The kinematic viscosity at 40°C of the lubricating oil composition of one embodiment of the present invention is preferably 10 to 120 mm ² /s, more preferably 15 to 100 mm ² /s, even more preferably 20 to 80 mm ² /s, even more preferably is 25 to 70 mm ² /s, particularly preferably 27 to 60 mm ² /s.

The kinematic viscosity at 100° C. of the lubricating oil composition of one embodiment of the present invention is preferably 2.5 to 20.0 mm ² /s, more preferably 4.0 to 18.0 mm ² /s, and still more preferably 5.0 mm 2 /s. 0 to 15.0 mm ² /s, more preferably 6.0 to 12.0 mm ² /s, particularly preferably 7.0 to 10.0 mm ² /s.

The viscosity index of the lubricating oil composition of one embodiment of the present invention is preferably 80 or more, more preferably 100 or more, more preferably 120 or more, even more preferably 150 or more, even more preferably 170 or more, and particularly preferably 200 or more. It is.

In the lubricating oil composition of one aspect of the present invention, the content of calcium atoms is preferably 50 mass ppm or more, more preferably 100 mass ppm or more, and more preferably 50 mass ppm or more, based on the total amount (100 mass %) of the lubricating oil composition. Preferably 150 mass ppm or more, more preferably 200 mass ppm or more, still more preferably 250 mass ppm or more, still more preferably 300 mass ppm or more, still more preferably 350 mass ppm or more, even more preferably 400 mass ppm or more, particularly preferably is 450 mass ppm or more, and preferably 3000 mass ppm or less, more preferably 2500 mass ppm or less, more preferably 2000 mass ppm or less, still more preferably 1500 mass ppm or less, even more preferably 1000 mass ppm or less, Particularly preferably, it is 800 mass ppm or less.

In the lubricating oil composition of one aspect of the present invention, the content of phosphorus atoms is preferably 50 mass ppm or more, more preferably 100 mass ppm or more, and further Preferably 200 mass ppm or more, even more preferably 300 mass ppm or more, particularly preferably 400 mass ppm or more, and preferably 1000 mass ppm or less, more preferably 950 mass ppm or less, still more preferably 900 mass ppm or less. , even more preferably 850 mass ppm or less, particularly preferably 750 mass ppm or less.

In the lubricating oil composition of one aspect of the present invention, the content of boron atoms is preferably 10 mass ppm or more, more preferably 50 mass ppm or more, and further Preferably 100 mass ppm or more, even more preferably 150 mass ppm or more, particularly preferably 200 mass ppm or more, and preferably 1000 mass ppm or less, more preferably 900 mass ppm or less, still more preferably 800 mass ppm or less. , more preferably 700 mass ppm or less, particularly preferably 600 mass ppm or less.

In the lubricating oil composition of one aspect of the present invention, the content of nitrogen atoms is preferably 100 mass ppm or more, more preferably 300 mass ppm or more, and further Preferably 500 mass ppm or more, even more preferably 700 mass ppm or more, particularly preferably 1000 mass ppm or more, and preferably 8000 mass ppm or less, more preferably 6000 mass ppm or less, still more preferably 5000 mass ppm or less. , more preferably 4000 mass ppm or less, particularly preferably 3000 mass ppm or less.

[Applications of lubricating oil composition]
The lubricating oil composition of one embodiment of the present invention has excellent high-temperature cleanliness and long-drain properties, and in addition to these properties, it can maintain excellent long-drain properties even when water is mixed in.
Therefore, the lubricating oil composition of one embodiment of the present invention can be applied to various devices that can exhibit the above characteristics, and can be suitably used for lubrication between various parts in an internal combustion engine, and in particular, can be applied to various devices that can exhibit the above characteristics. It can be suitably used for lubrication between various parts in an internal combustion engine of a hybrid system having an electric motor as a power source.

Further, in consideration of the above-mentioned characteristics of the lubricating oil composition of one embodiment of the present invention, the present invention can also provide the following [I] and [II].
[I] An internal combustion engine installed in a hybrid system filled with the lubricating oil composition of one embodiment of the present invention described above.
[II] A method for lubricating an internal combustion engine, in which the lubricating oil composition of one embodiment of the present invention described above is applied to an internal combustion engine installed in a hybrid system.

The hybrid system described in [I] and [II] above is a mechanism having an internal combustion engine and an electric motor as power sources.
Examples of the hybrid system described in [I] and [II] above include a hybrid automobile, a hybrid two-wheeled vehicle, a hybrid railway, a hybrid ship, and the like.
The internal combustion engine of [I] above is filled with the lubricating oil composition of one embodiment of the present invention described above, and is a device that is installed in a hybrid system together with an electric motor.
Further, the method for lubricating an internal combustion engine in [II] above specifies that the lubricating oil composition of one embodiment of the present invention described above is applied to an internal combustion engine installed in a hybrid system. The composition may also be applied to electric motors.

〔上記式中、Ｒ^ｂ１は、それぞれ独立に、水素原子又は炭素数１～１０のアルキル基、又は炭素数１～１０のアルコキシ基である。
Ｒ^ｂ２は、水素原子、炭素数１～２０のアルキル基、環形成炭素数３～１８のシクロアルキル基、環形成炭素数６～１８のアリール基、水酸基、アミノ基、又は－Ｏ－ＣＯ－Ｒ^ｂ３で表される基（Ｒ^ｂ３は、水素原子又は炭素数１～２０の炭化水素基）である。
Ｚは、炭素数１～２０のアルキレン基、環形成炭素数３～１８のシクロアルキレン基、環形成炭素数６～１８のアリーレン基、酸素原子、硫黄原子、又は－Ｏ－ＣＯ－（ＣＨ_２）_ｎ－ＣＯ－Ｏ－で表される基（ｎは１～２０の整数）である。〕
［４］成分（Ｂ１）が、前記一般式（ｂ１－１）で表される化合物（Ｂ１１）を少なくとも含む、上記［３］に記載の潤滑油組成物。
［５］基油（Ａ）、ヒンダードアミン系化合物（Ｂ１）及びアルカノールアミン系化合物（Ｂ２）から選ばれる１種以上のアミン系化合物（Ｂ）、及び、塩基価が０～１００ｍｇＫＯＨ／ｇの中性金属サリシレート（Ｃ）を含有する、潤滑油組成物であって、
成分（Ｂ２）の含有量が、前記潤滑油組成物の全量基準で、２．２０質量％以上である、
潤滑油組成物。
［６］成分（Ｃ）と成分（Ｂ２）との含有量比［（Ｃ）／（Ｂ２）］が、質量比で、０．１０～７．００である、上記［５］に記載の潤滑油組成物。
［７］成分（Ｂ２）の含有量が、前記潤滑油組成物の全量基準で、２．２００．１０～１０．０質量％である、上記［５］又は［６］に記載の潤滑油組成物。
［８］成分（Ｂ２）が、ジアルカノールアミン系化合物（Ｂ２１）を含む、上記［５］～［７］のいずれか一項に記載の潤滑油組成物。
［１０］さらに、イミド系化合物（Ｅ）を含み、
成分（Ｅ）が、非ホウ素変性アルケニルコハク酸イミド（Ｅ１）及びホウ素変性アルケニルコハク酸イミド（Ｅ２）から選ばれる１種以上を含む、上記［１］～［９］のいずれかに記載の潤滑油組成物。
［１１］成分（Ｅ）が、成分（Ｅ１）及び成分（Ｅ２）含み、
成分（Ｅ１）と成分（Ｅ２）との含有量比［（Ｅ１）／（Ｅ２）］が、質量比で、５．００未満である、上記［１０］に記載の潤滑油組成物。
［１２］さらに、ジチオリン酸亜鉛（Ｆ）を含有する、上記［１］～［１１］のいずれか一項に記載の潤滑油組成物。
［１３］リン原子の含有量が、前記潤滑油組成物の全量基準で、１０００質量ｐｐｍ以下である、上記［１］～［１２］のいずれか一項に記載の潤滑油組成物。
［１４］ハイブリッドシステムの内燃機関の潤滑に用いられる、上記［１］～［１３］のいずれか一項に記載の潤滑油組成物。
［１５］上記［１］～［１４］のいずれか一項に記載の潤滑油組成物を充填した、ハイブリッドシステムに搭載される、内燃機関。
［１６］上記［１］～［１４］のいずれか一項に記載の潤滑油組成物をハイブリッドシステムに搭載される内燃機関に適用した、内燃機関の潤滑方法。 As described above, the present invention discloses the following aspects.
[1] Base oil (A), one or more amine compounds (B) selected from hindered amine compounds (B1) and alkanolamine compounds (B2), and a neutral base number of 0 to 100 mgKOH/g A lubricating oil composition containing metal salicylate (C),
The content of component (B1) is 1.50% by mass or more and less than 3.50% by mass, based on the total amount of the lubricating oil composition.
Lubricating oil composition.
[2] The lubrication according to [1] above, wherein the content ratio [(C)/(B1)] of component (C) and component (B1) is 0.10 to 7.00 in mass ratio. oil composition.
[3] Component (B1) contains one or more selected from the compound (B11) represented by the following general formula (b1-1) and the compound (B12) represented by the following general formula (b1-2) , the lubricating oil composition according to [1] or [2] above.

[In the above formula, R ^b1 is each independently a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms.
R ^b2 is a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 18 ring carbon atoms, an aryl group having 6 to 18 ring carbon atoms, a hydroxyl group, an amino group, or -O-CO- A group represented by R ^b3 (R ^b3 is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms).
Z is an alkylene group having 1 to 20 carbon atoms, a cycloalkylene group having 3 to 18 ring carbon atoms, an arylene group having 6 to 18 ring carbon atoms, an oxygen atom, a sulfur atom, or -O-CO-(CH ₂ ) _n is a group represented by -CO-O- (n is an integer from 1 to 20). ]
[4] The lubricating oil composition according to [3] above, wherein component (B1) contains at least the compound (B11) represented by the general formula (b1-1).
[5] Base oil (A), one or more amine compounds (B) selected from hindered amine compounds (B1) and alkanolamine compounds (B2), and a neutral base number of 0 to 100 mgKOH/g A lubricating oil composition containing metal salicylate (C),
The content of component (B2) is 2.20% by mass or more based on the total amount of the lubricating oil composition.
Lubricating oil composition.
[6] The lubrication according to [5] above, wherein the content ratio [(C)/(B2)] of component (C) and component (B2) is 0.10 to 7.00 in mass ratio. oil composition.
[7] The lubricating oil composition according to [5] or [6] above, wherein the content of component (B2) is 2.200.10 to 10.0% by mass based on the total amount of the lubricating oil composition. thing.
[8] The lubricating oil composition according to any one of [5] to [7] above, wherein component (B2) contains a dialkanolamine compound (B21).
[10] Furthermore, it contains an imide compound (E),
The lubricant according to any one of [1] to [9] above, wherein component (E) contains one or more selected from non-boron modified alkenyl succinimide (E1) and boron modified alkenyl succinimide (E2). oil composition.
[11] Component (E) contains component (E1) and component (E2),
The lubricating oil composition according to [10] above, wherein the content ratio [(E1)/(E2)] of component (E1) and component (E2) is less than 5.00 in mass ratio.
[12] The lubricating oil composition according to any one of [1] to [11] above, further containing zinc (F) dithiophosphate.
[13] The lubricating oil composition according to any one of [1] to [12] above, wherein the content of phosphorus atoms is 1000 mass ppm or less, based on the total amount of the lubricating oil composition.
[14] The lubricating oil composition according to any one of [1] to [13] above, which is used to lubricate an internal combustion engine of a hybrid system.
[15] An internal combustion engine installed in a hybrid system, filled with the lubricating oil composition according to any one of [1] to [14] above.
[16] A method for lubricating an internal combustion engine, in which the lubricating oil composition according to any one of [1] to [14] above is applied to an internal combustion engine installed in a hybrid system.

Next, the present invention will be explained in more detail with reference to examples, but the present invention is not limited to these examples in any way. The methods for measuring various physical properties are as follows.

(1) Content of calcium atoms (Ca), phosphorus atoms (P), boron atoms (B), and zinc atoms (Zn) Measured in accordance with JPI-5S-38-92.
(2) Content of nitrogen atoms (N) Measured in accordance with JIS K2609:1998.

(3) Weight average molecular weight (Mw)
Measurements were made using a gel permeation chromatography device (manufactured by Agilent, "1260 HPLC") under the following conditions, and the values measured in terms of standard polystyrene were used.
(Measurement condition)
・Column: Two “Shodex LF404” connected in sequence.
・Column temperature: 35℃
・Developing solvent: Chloroform ・Flow rate: 0.3 mL/min

Examples 1 to 9, Comparative Examples 1 to 10
The base oil and various additives were added and mixed in the amounts shown in Tables 1 and 2 to prepare lubricating oil compositions.
The details of each component used in the preparation of the lubricating oil composition are as follows.

<Component (A): Base oil>
- "100N mineral oil (a)": Paraffinic mineral oil classified into Group III of API base oil category, kinematic viscosity at 40°C = 20 mm ² /s, viscosity index = 122, corresponds to component (A).
<Component (B): Amine compound>
- "Hindered amine compound (b1)": 2,2,6,6-tetramethylpiperidin-4-yl dodecanoate, nitrogen atom content = 4.13% by mass, corresponding to component (B11-1). .
・"Alkanolamine compound (b2)": Diethanolamine, corresponding to component (B21-1).
<Component (C): Neutral metal salicylate>
- "Neutral Ca salicylate (c)": Calcium salicylate with base value = 64 mgKOH/g, Ca content = 2.3% by mass, corresponding to component (C).
<Metallic cleaners other than component (C)>
- "Overbased Ca phenate": calcium phenate with base number = 250 mgKOH/g, Ca content = 9.3% by mass.
- "Neutral Ca sulfonate (1)": Calcium sulfonate with base number = 19 mgKOH/g, Ca content = 2.4% by mass.
- "Neutral Ca sulfonate (2)": Calcium sulfonate with base number = 17 mgKOH/g, Ca content = 2.2% by mass.
- "Overbased Ca sulfonate (1)": Calcium sulfonate with base number = 425 mgKOH/g, Ca content = 16% by mass.
- "Overbased Ca sulfonate (2)": Calcium sulfonate with base number = 300 mgKOH/g, Ca content = 12% by mass.
- "Overbased Ca sulfonate (3)": Calcium sulfonate with base number = 405 mgKOH/g, Ca content = 15% by mass.
<Component (D): Antioxidant that does not fall under component (B)>
- "Amine antioxidant (d1) that does not fall under component (B)": dinonyl diphenylamine, nitrogen atom content = 3.6% by mass, falls under component (D1).
- "Phenolic antioxidant (d2)": Benzenepropanoic acid-3,5-bis(1,1-dimethylethyl)-4-hydroxyalkyl ester, corresponding to component (D2).
<Component (E): Imide compound>
- "Non-boron modified alkenyl succinimide (e1)": Polybutenyl succinic acid bisimide, nitrogen atom (N) content = 1.0% by mass, corresponding to component (E1).
- "Boron modified alkenyl succinimide (e2)": boron modified product of polybutenyl succinic acid monoimide, boron atom (B) content = 1.3% by mass, nitrogen atom (N) content = 1. 2% by mass, B/N=1.08, applicable to component (E2).
<Component (F): Zinc dithiophosphate>
- "Secondary zinc dithiophosphate (f1)": Secondary zinc dialkyldithiophosphate, a compound in which R ^f1 to R ^f4 in the general formula (f-1) are all secondary alkyl groups. Phosphorus atom content = 7.1% by mass, zinc atom content = 8.2% by mass, corresponding to component (F).
- "Primary zinc dithiophosphate (f2)": a primary zinc dialkyldithiophosphate, a compound in which R ^f1 to R ^f4 in the general formula (f-1) are all primary alkyl groups. Phosphorus atom content = 7.5% by mass, zinc atom content = 8.5% by mass, corresponding to component (F).
<Component (G): Organic molybdenum compound>
・"Organic molybdenum compound (g1)": Molybdenum dithiocarbamate, applicable to component (G).
<Other additives>
- "Additive mixture": an additive mixture consisting of a viscosity index improver (Mw = 400,000), a pour point depressant (Mw = 70,000), glycerin monooleate, and a silicone antifoaming agent.

Regarding the prepared lubricating oil composition, the content of each atom was measured and the following evaluation tests were conducted. These results are shown in Tables 1 and 2.

(1) Long-drain performance evaluation test Using the prepared lubricating oil composition, an ISOT test was conducted for 168 hours under the following test conditions in which pure water was added while blowing NOx gas, and the degraded oil was adjusted.
<Test conditions>
・Testing machine: ISOT TESTER manufactured by Yoshida Scientific Instruments Co., Ltd.
・Test container internal volume: 500mL
・Amount of lubricating oil composition used: 300mL
・NOx gas amount: 2,000 volume ppm based on the total amount of gas supplied
- Amount of pure water added: 5% by volume added to the total amount of lubricating oil composition every 24 hours - Stirring speed: 800 r/min
・Test temperature (cycle): (1) 60°C for 4 hours, (2) 95°C for 2 hours, (3) 120°C for 12 hours, and (4) 60°C for 6 hours (1) to (4) ) as one cycle, and the cycle was repeated.
The above degraded oil was subjected to pressurized differential scanning calorimetry (PDSC) under the conditions of 180°C and 200 psig oxygen (not flow) in accordance with ASTM D6186-88, and the time from the start of measurement to autooxidation was measured. Oxidation induction time (OIT) was measured. It can be said that the longer the oxidation induction time, the higher the long-draining properties of the lubricating oil composition. In this example, when the oxidation induction time was 50 minutes or more, it was determined that the lubricating oil composition had good long drain properties.

(2) Hot tube test Using the degraded oil prepared in the long drain property evaluation test in (1) above, a hot tube test was conducted at a test temperature of 240° C. in accordance with JPI-5S-55-99. The degree of discoloration of the glass tube after the test was evaluated on a 21-point scale ranging from 0 (black) to 10 (colorless) (merit score) in 0.5 increments. It can be said that the higher the rating, the more excellent the lubricating oil composition is in high-temperature cleanliness. In this example, when the rating was 7.0 or higher, it was determined that the lubricating oil composition had good high-temperature detergency.

From Table 1, the lubricating oil compositions prepared in Examples 1 to 9 had excellent high-temperature cleaning properties and good long-drain properties when water was mixed. On the other hand, Table 2 shows that the lubricating oil compositions prepared in Comparative Examples 1 to 10 were inferior in at least one of high temperature cleanliness and long drain properties.

Claims (15)

Base oil (A), one or more amine compounds (B) selected from hindered amine compounds (B1) and alkanolamine compounds (B2), and a neutral metal salicylate with a base number of 0 to 100 mgKOH/g ( C) A lubricating oil composition comprising:
The content of component (B1) is 1.50% by mass or more and less than 3.50% by mass, based on the total amount of the lubricating oil composition.
Lubricating oil composition. The lubricating oil composition according to claim 1, wherein the content ratio [(C)/(B1)] of component (C) and component (B1) is 0.10 to 7.00 in mass ratio. A claim in which component (B1) contains one or more selected from a compound (B11) represented by the following general formula (b1-1) and a compound (B12) represented by the following general formula (b1-2). 3. The lubricating oil composition according to 1 or 2.

[In the above formula, R ^b1 is each independently a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms.
R ^b2 is a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 18 ring carbon atoms, an aryl group having 6 to 18 ring carbon atoms, a hydroxyl group, an amino group, or -O-CO- A group represented by R ^b3 (R ^b3 is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms).
Z is an alkylene group having 1 to 20 carbon atoms, a cycloalkylene group having 3 to 18 ring carbon atoms, an arylene group having 6 to 18 ring carbon atoms, an oxygen atom, a sulfur atom, or -O-CO-(CH ₂ ) _n is a group represented by -CO-O- (n is an integer from 1 to 20). ] The lubricating oil composition according to claim 3, wherein component (B1) contains at least a compound (B11) represented by the general formula (b1-1). Base oil (A), one or more amine compounds (B) selected from hindered amine compounds (B1) and alkanolamine compounds (B2), and a neutral metal salicylate with a base number of 0 to 100 mgKOH/g ( C) A lubricating oil composition comprising:
The content of component (B2) is 2.20% by mass or more based on the total amount of the lubricating oil composition.
Lubricating oil composition. The lubricating oil composition according to claim 5, wherein the content ratio [(C)/(B2)] of component (C) and component (B2) is 0.10 to 7.00 in mass ratio. The lubricating oil composition according to claim 5 or 6, wherein the content of component (B2) is 2.20 to 10.0% by mass based on the total amount of the lubricating oil composition. The lubricating oil composition according to any one of claims 5 to 7, wherein component (B2) contains a dialkanolamine compound (B21). Furthermore, it contains an imide compound (E),
The lubricating oil composition according to any one of claims 1 to 8, wherein component (E) contains one or more selected from non-boron modified alkenyl succinimide (E1) and boron modified alkenyl succinimide (E2). . Component (E) contains component (E1) and component (E2),
The lubricating oil composition according to claim 9, wherein the content ratio [(E1)/(E2)] of component (E1) and component (E2) is less than 5.00 in mass ratio. The lubricating oil composition according to any one of claims 1 to 10, further comprising zinc (F) dithiophosphate. The lubricating oil composition according to any one of claims 1 to 11, wherein the content of phosphorus atoms is 1000 mass ppm or less based on the total amount of the lubricating oil composition. The lubricating oil composition according to any one of claims 1 to 12, which is used for lubricating an internal combustion engine of a hybrid system. An internal combustion engine installed in a hybrid system, filled with the lubricating oil composition according to any one of claims 1 to 13. A method for lubricating an internal combustion engine, comprising applying the lubricating oil composition according to any one of claims 1 to 13 to an internal combustion engine installed in a hybrid system.