JP2017179159A - Lubricant composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricant composition that significantly reduces sludge formation when contaminated with aqueous metal processing oil.SOLUTION: A lubricant composition comprises (A) a base oil with a 40°C kinematic viscosity of 70-500 mm/s, (B) at least one selected from metal sulfonate, metal salicylate and metal phenate and having a base number of 10-120 mgKOH/g, and (C) at least one selected from dialkyldithiocarbamate (c1) and phosphorothioate (c2).SELECTED DRAWING: None

Description

  The present invention relates to a lubricating oil composition.

An aluminum can called a two-piece can is configured by combining two parts, a lid and a trunk. As a manufacturing method of the two-piece can, a deep drawing manufacturing method called a DI method having drawing and ironing steps is generally known.
Since the manufacturing process of the body portion in this DI method, so-called drawing and ironing, has severe processing conditions, a processing oil called coolant is used for the purpose of lubricity for molding a can. As the coolant, water-based processing oil is used from the viewpoints of wastewater treatment properties and cooling properties (Patent Documents 1 and 2).
On the other hand, in the can manufacturing site, for example, water-insoluble lubricating oil is used as bearing oil and / or gear oil for a can-making machine driving unit that performs drawing and ironing.

JP 2000-017285 A JP 2005-220170 A

  At the site of the can manufacturing process, there is a problem that sludge is generated when the coolant, which is a water-based processing oil, is mixed into the can manufacturing machine drive unit during the processing. The generated sludge causes clogging of piping for supplying lubricating oil to the bearing portion and gear portion of the can making machine driving portion.

  An object of the present invention is to provide a lubricating oil composition that significantly reduces sludge formation even when water-based metalworking oil is mixed.

As a result of intensive studies by the inventors, a lubricating oil composition containing a base oil (A) having a specific viscosity and the following specific components (B) and (C) solves the above problems. I found.
That is, the present invention provides the following [1] and [2].
[1] a base oil (A) having a kinematic viscosity at 40 ° C. of 70 to 500 mm ² / s;
At least one (B) selected from metal sulfonates, metal salicylates and metal phenates having a base number of 10 to 120 mg KOH / g;
At least one selected from dialkyldithiocarbamate (c1) and phosphorothioate (c2) (C)
And a lubricating oil composition.
[2] A method for lubricating a bearing portion or a gear portion in the presence of an aqueous metalworking oil,
A base oil (A) having a kinematic viscosity at 40 ° C. of 70 to 500 mm ² / s;
At least one (B) selected from metal sulfonates, metal salicylates and metal phenates having a base number of 10 to 120 mg KOH / g;
At least one selected from dialkyldithiocarbamate (c1) and phosphorothioate (c2) (C)
A lubricating method of lubricating a bearing portion or a gear portion using a lubricating oil composition containing

  According to the present invention, even when an aqueous metalworking oil is mixed, for example, in the presence of the lubricating oil composition and the aqueous metalworking oil that significantly reduce sludge generation in the canning machine drive unit, the lubricating oil A lubrication method for lubricating a bearing portion or a gear portion using the composition can be provided.

Hereinafter, embodiments of the present invention will be described in detail.
In this specification, kinematic viscosity means kinematic viscosity measured based on JISK2283: 2000.
[Lubricating oil composition]
The lubricating oil composition according to this embodiment contains a base oil (A), a specific component (B), and a component (C). Details will be described below.

<Base oil (A)>
The base oil (A) contained in the lubricating oil composition of this embodiment is required to have a kinematic viscosity at 40 ° C. of 70 to 500 mm ² / s.
When the 40 ° C. kinematic viscosity is less than 70 mm ² / s, the oil film forming ability is inferior, and wear trouble or seizure due to metal contact in the bearing or gear portion is not preferable. If the kinematic viscosity exceeds 500 mm ² / s, heat generation increases due to viscous resistance, which is not preferable because it accelerates deterioration of the composition.
The kinematic viscosity at 40 ° C. of the base oil (A) is preferably 90 to 400 mm ² / s, more preferably 150 to 320 mm ² / s, and still more preferably 150 to 220 mm ² / s.

The base oil (A) contained in the lubricating oil composition of the present embodiment is not particularly limited as long as it has the above 40 ° C. viscosity, and at least one selected from mineral oil and synthetic oil may be used. it can.
An example of mineral oil is a distillate obtained by subjecting paraffinic crude oil, mixed crude oil or naphthenic crude oil to atmospheric distillation, or distilling the residual oil of atmospheric distillation under reduced pressure, or according to a conventional method. Examples of the refined oil obtained by refining include solvent refined oil, hydrogenated refined oil, dewaxed oil, and clay-treated oil. Specific examples include light neutral oil, medium neutral oil, heavy neutral oil, bright stock, and the like. Moreover, the mineral oil obtained by isomerizing the wax (GTL wax) manufactured by a Fischer-Tropsch method etc. can be mentioned.
Synthetic oils include, for example, polyα-olefins such as polybutene, ethylene-α-olefin copolymers, α-olefin homopolymers or copolymers; various esters such as polyol esters, dibasic acid esters, and phosphate esters. Various ethers such as polyphenyl ether; polyglycol; alkylbenzene; alkylnaphthalene and the like. Synthetic oils can be used alone or in combination of two or more.
In addition, mineral oil and synthetic oil are not limited to the said illustration.

<At least one selected from metal sulfonate, metal salicylate and metal phenate: component (B)>
The lubricating oil composition of this embodiment contains at least one selected from metal sulfonates, metal salicylates and metal phenates having a base number of 10 to 120 mgKOH / g as component (B). The base number of the metallic detergent means a base number measured by a perchloric acid method in accordance with JISK2501: 2003.
The present inventors have found that the following effects can be obtained by limiting the base number of at least one (B) selected from metal sulfonate, metal salicylate and metal phenate to 10 to 120 mgKOH / g, respectively. It was. The processed metal powder mixed with the water-based processing oil into the can-making machine drive can be a factor in sludge generation. Therefore, by limiting the base number of the component (B) to a specific range, the component (B) is adsorbed on the surface of the mixed metal powder to form a film, and the surface of the metal powder is inactivated, Has the function of suppressing sludge generation.
The metal sulfonate, metal salicylate, and metal phenate are each required to have a base number of 10 to 120 mgKOH / g. If the base number of component (B) is less than 10 mgKOH / g, the adsorption power to the surface of the metal powder is inferior. When the base number exceeds 120 mgKOH / g, it is not preferable because sludge generation when the aqueous processing oil is mixed into the can-making machine drive section cannot be suppressed.
The base number of at least one (B) selected from metal sulfonate, metal salicylate and metal phenate is preferably 15 to 100 mgKOH / g, more preferably 20 mgKOH / g to 60 mgKOH / g.

  The at least one (B) metal selected from metal sulfonates, metal salicylates and metal phenates is preferably an alkali metal or an alkaline earth metal, more preferably an alkaline earth metal. Examples of the alkali metal include sodium and potassium. Examples of the alkaline earth metal include magnesium, calcium, and barium. The metal is preferably one or more selected from sodium, magnesium and calcium, more preferably calcium.

As the metal sulfonate, for example, an alkali metal salt and / or an alkaline earth of an alkyl aromatic sulfonic acid obtained by sulfonating an alkyl aromatic compound preferably having a weight average molecular weight of 300 to 1500, more preferably 400 to 700 is preferable. There may be mentioned similar metal salts. The metal sulfonate having a base number of 10 to 120 mgKOH / g is, for example, an alkali metal such as an alkali metal such as sodium or an alkali metal such as magnesium or calcium or an oxide or hydroxide of an alkaline earth metal such as magnesium or calcium. And / or by direct reaction with an alkaline earth metal base. Alternatively, there may be mentioned a method obtained by substituting an alkali metal salt such as sodium salt or potassium salt with an alkaline earth metal salt.
Examples of the metal salicylates include alkali metal salts and / or alkaline earth metal salts of alkyl salicylic acid. The metal salicylate having a base number of 10 to 120 mgKOH / g is, for example, the above alkylsalicylic acid, an alkali metal such as sodium, an alkali metal such as an oxide or hydroxide of an alkaline earth metal such as magnesium or calcium, and / or It can be obtained by direct reaction with an alkaline earth metal base. Alternatively, there may be mentioned a method obtained by substituting an alkali metal salt such as sodium salt or potassium salt with an alkaline earth metal salt.
Examples of the metal phenate include alkylphenol, alkylphenol sulfide, and alkali metal salt and / or alkaline earth metal salt of a Mannich reaction product of alkylphenol. The metal phenate having a base number of 10 to 120 mgKOH / g can be obtained by, for example, converting the above-mentioned alkylphenol, alkylphenol sulfide, or Mannich reaction of alkylphenol to an oxide or hydroxide of an alkali metal such as sodium or an alkaline earth metal such as magnesium or calcium. It can be obtained by directly reacting with an alkali metal such as a product and / or an alkaline earth metal base. Alternatively, there may be mentioned a method obtained by substituting an alkali metal salt such as sodium salt or potassium salt with an alkaline earth metal salt.
In addition, the alkyl group constituting the metal sulfonate, metal salicylate and metal phenate is preferably one having 4 to 30 carbon atoms, more preferably an alkyl group having 6 to 18 carbon atoms. You may have a branch.

The said component (B) should just be at least 1 sort (s) chosen from the metal sulfonate, metal salicylate, and metal phenate which have the said base value range, and may use it in combination of 2 or more type. It is more preferable to use a metal sulfonate as the component (B).
In this embodiment, the content of at least one (B) selected from metal sulfonate, metal salicylate and metal phenate having a base number of 10 to 120 mgKOH / g is 0.1 to 5% by mass based on the total amount of the composition. It is preferable that If content of a component (B) is the said range, the production | generation of sludge can be suppressed.
The content of the component (B) is more preferably 0.2 to 4.5% by mass, still more preferably 0.5 to 3% by mass.

<At least one selected from dialkyldithiocarbamate (c1) and phosphorothioate (c2): Component (C)>
The lubricating oil composition of this embodiment contains at least one selected from dialkyldithiocarbamate (c1) and phosphorothioate (c2) as component (C).
Preferred examples of the dialkyldithiocarbamate (c1) include compounds having the following general formula (1).

In the formula, R ¹ , R ² , R ³ and R ⁴ each independently represent an alkyl group having 1 to 20 carbon atoms, and may be the same or different from each other. R ⁵ represents an alkylene group having 1 to 10 carbon atoms.

In the general formula (1), the alkyl group having 1 to 20 carbon atoms represented by R ^{1 to} R ⁴ may be linear or branched, for example, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl. Group, isobutyl group, sec-butyl group, n-amyl group, isoamyl group, n-hexyl group, 1-methylpentyl group, 4-methylpentyl group, 1,3-dimethylbutyl group, n-octyl group, 2- Ethylhexyl group, 2,2,4-trimethylpentyl group, 2-octyl group, n-decyl group, isodecyl group, lauryl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, octadecyl group, isooctadecyl group, nonadecyl group , Icosyl group. Examples of the cycloalkyl group include a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, and the like.
The alkylene having 1 to 10 carbon atoms represented by R ⁵ may be linear or branched. For example, a methylene group, ethylene group, trimethylene group, ethylethylene group, propylene group, tetramethylene group, pentamethylene group and the like can be mentioned.
Among them, methylene bis (dibutyldithiocarbamate) in which all of R ^{1 to} R ⁴ are butyl groups and R ⁵ is a methylene group is preferable.

Preferred examples of the phosphorothioate (c2) include compounds having the following general formula (2).

In the formula, R ⁶ , R ⁷ and R ⁸ are each independently a saturated or unsaturated aliphatic hydrocarbon group having a straight chain or branched chain having 1 to 18 carbon atoms, or an optionally substituted carbon. It is a saturated or unsaturated alicyclic hydrocarbon group or aromatic hydrocarbon group of formula 5-18.

In general formula (2), the carbon number of the saturated or unsaturated aliphatic hydrocarbon group represented by R ^{6 to} R ⁸ is more preferably 5 to 18. Specific examples of the saturated aliphatic hydrocarbon group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, and various butyl groups (“various” includes linear and all branched ones). The same applies hereinafter), various pentyl groups, various hexyl groups, various heptyl groups, various octyl groups, various nonyl groups, various decyl groups, various dodecyl groups, various tridecyl groups, various tetradecyl groups, various pentadecyl groups, various hexadecyl groups, Various heptadecyl groups and various octadecyl groups can be mentioned. Examples of the unsaturated aliphatic hydrocarbon group include those in which a specific saturated aliphatic hydrocarbon group other than the methyl group, such as an ethylene group or a propylene group, has at least one unsaturated bond.
Examples of the saturated or unsaturated alicyclic hydrocarbon group having 5 to 18 carbon atoms represented by R ^{6 to} R ⁸ include a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, a cyclononyl group, and a cyclodecyl group. Can be mentioned. Examples of the unsaturated alicyclic hydrocarbon group include those in which the saturated alicyclic hydrocarbon group described above has at least one unsaturated bond, such as cyclopentenyl group and cyclohexenyl.
Specific examples of the aromatic hydrocarbon group represented by R ^{6 to} R ⁸ include aryl groups such as a phenyl group and a naphthyl group.
As the substituent for example, C ₁ -C ₆ alkyl group, C ₁ -C ₆ alkoxy group, an aryl group of C ₆ -C ₁₄ and the like.

Specific examples of the thiophosphate compound include, for example, tributyl phosphorothioate, tripentyl phosphorothioate, trihexyl phosphorothioate, triheptyl phosphorothioate, trioctyl phosphorothioate, trinonyl phosphorothioate, tridecyl phosphorothioate, triundecyl phosphorothioate, tridodecyl phosphorothioate, tritridecyl Phosphorothioate, tritetradecyl phosphorothioate, tripentadecyl phosphorothioate, trihexadecyl phosphorothioate, triheptadecyl phosphorothioate, trioctadecyl phosphorothioate, trioleyl phosphorothioate, triphenyl phosphorothioate, tricresyl phosphorothioate, trixylenyl phosphoro Oate, cresyl diphenyl phosphorothioate, xylenyl diphenyl phosphorothioate, tris (n-propylphenyl) phosphorothioate, tris (isopropylphenyl) phosphorothioate, tris (n-butylphenyl) phosphorothioate, tris (isobutylphenyl) phosphorothioate, tris (s-butyl) Phenyl) phosphorothioate, and tris (t-butylphenyl) phosphorothioate.
Of these, triphenyl phosphorothioate is preferable.

The above-mentioned dialkyldithiocarbamate (c1) and phosphorothioate (c2) may be used singly or in combination of two or more.
Moreover, it is more preferable that the lubricating oil composition of the present embodiment contains a combination of dialkyldithiocarbamate (c1) and phosphorothioate (c2) as component (C). When a combination of (c1) and (c2) is used as component (C), the mass ratio (c1) :( c2) of (c1) and (c2) contained in the composition is 1: 4. Preferably it is in the range of -4: 1.
Specifically, it is preferable to use methylenebis (dibutyldithiocarbamate) (c1) and triphenylphosphorothioate (c2) in combination.

None of the dialkyldithiocarbamate (c1) and phosphorothioate (c2), which can be included as component (C), is substantially acidic as apparent from the structure, and is acidic by hydrolysis or the like when mixed with water. It is a neutral compound that is difficult to become. In both the dialkyldithiocarbamate (c1) and phosphorothioate (c2) specifically described, there is almost no change in acidity due to hydrolysis or the like even when water is mixed.
In this way, the component (C) is not substantially acidic, and it is difficult to become acidic even when water is mixed, thereby suppressing sludge generation when the aqueous processing oil is mixed in the can-making drive unit. The inventors have found that this is possible.
At least one selected from metal sulfonates, metal salicylates and metal phenates having a specific base number range as described above (B), and at least one dialkyldithiocarbamate (c1) and phosphorothioate (c2) which are not substantially acidic ( By using in combination with C), it is possible to more effectively suppress the generation of sludge when the aqueous processing oil is mixed into the can-making machine drive.

The lubricating oil composition of the present embodiment preferably contains 0.1 to 2% by mass of at least one (C) selected from dialkyldithiocarbamate (c1) and phosphorothioate (c2) based on the total amount of the composition. . If the content of component (C) is in the above range, a lubricating oil composition having excellent load resistance and wear resistance can be obtained, which is preferable.
The content of the component (C) in the lubricating oil composition of the present embodiment is more preferably 0.15 to 1.5% by mass, further preferably 0.2 to 1.0% by mass, based on the total amount of the composition. Especially preferably, it is 0.2-0.8 mass%. In addition, when using multiple types (c1) and (c2) as said component (C), or when using the combination of (c1) and (c2), the total amount contains component (C). Amount.

<Other additives>
The lubricating oil composition of the present invention may contain additives other than the above components (B) and (C) together with the base oil, if necessary, within a range not impairing the effects of the present invention.
Examples of other lubricating oil additives include viscosity index improvers, pour point depressants, metal deactivators, antifoaming agents, antioxidants, rust inhibitors, friction modifiers, and demulsifiers. .
Each of these additives may be used alone or in combination of two or more.

As the viscosity index improver, for example, polymethacrylate, dispersed polymethacrylate, olefin copolymer (for example, ethylene-propylene copolymer), dispersed olefin copolymer, styrene copolymer (for example, Styrene-diene hydrogenated copolymer, etc.). From the viewpoint of the effect of addition, the addition amount of these viscosity index improvers is preferably 0.3 to 5% by mass based on the total amount of the composition.
Examples of the pour point depressant include ethylene-vinyl acetate copolymers, condensates of chlorinated paraffin and naphthalene, condensates of chlorinated paraffin and phenol, polymers such as polymethacrylate and polyalkylstyrene. . The weight average molecular weight of these polymers is preferably 50,000 to 150,000. From the viewpoint of the effect of addition, the content of the pour point depressant is preferably 0.01 to 5.0% by mass, more preferably 0.02 to 2.0% by mass, based on the total amount of the composition.

Examples of the metal deactivator include benzotriazole compounds, tolyltriazole compounds, thiadiazole compounds, imidazole compounds, and pyrimidine compounds. The content of the metal deactivator is preferably 0.01 to 5.0% by mass, more preferably 0.02 to 3.0% by mass, based on the total amount of the composition, from the viewpoint of the effect of addition.
Examples of the antifoaming agent include silicone oil, fluorosilicone oil, and fluoroalkyl ether. The content of the antifoaming agent is preferably 0.001 to 0.50 mass%, more preferably 0.01 to 0.30 mass%, based on the total amount of the composition.

  As antioxidants, amine antioxidants, phenolic antioxidants, phosphorus antioxidants, sulfur antioxidants and molybdenum amine complex antioxidants used in conventional lubricating oil compositions are used. be able to. These antioxidants can be used singly or in combination of two or more.

  Examples of the amine antioxidant include monoalkyl diphenylamine compounds such as monooctyl diphenylamine and monononyl diphenylamine, 4,4′-dibutyldiphenylamine, 4,4′-dipentyldiphenylamine, 4,4′-dihexyldiphenylamine, 4 , 4'-diheptyldiphenylamine, 4,4'-dioctyldiphenylamine, 4,4'-dinonyldiphenylamine, dialkyldiphenylamine compounds such as monobutylphenylmonooctylphenylamine, tetrabutyldiphenylamine, tetrahexyldiphenylamine, tetraoctyldiphenylamine , Polyalkyldiphenylamine compounds such as tetranonyldiphenylamine, α-naphthylamine, phenyl-α-naphthylamine, butyl Examples thereof include naphthylamine compounds such as phenyl-α-naphthylamine, pentylphenyl-α-naphthylamine, hexylphenyl-α-naphthylamine, heptylphenyl-α-naphthylamine, octylphenyl-α-naphthylamine, and nonylphenyl-α-naphthylamine.

  Examples of the phenolic antioxidant include 2,6-di-tert-butyl-4-methylphenol, 2,6-di-tert-butyl-4-ethylphenol, and octadecyl 3- (3,5-di- monophenol compounds such as tert-butyl-4-hydroxyphenyl) propionate, 4,4′-methylenebis (2,6-di-tert-butylphenol), 2,2′-methylenebis (4-ethyl-6-tert- Diphenolic compounds such as butylphenol)

Examples of the phosphorus antioxidant include triphenyl phosphite.
Examples of the sulfur-based antioxidant include 2,6-di-tert-butyl-4- (4,6-bis (octylthio) -1,3,5-triazin-2-ylamino) phenol, phosphorus pentasulfide and Examples thereof include thioterpene compounds such as a reaction product with pinene.
As the molybdenum amine complex-based antioxidant, a hexavalent molybdenum compound, specifically, a product obtained by reacting molybdenum trioxide and / or molybdic acid with an amine compound, for example, as described in JP-A No. 2003-252887 A compound obtained by the production method can be used.
The content of the antioxidant may be the minimum amount necessary to maintain oxidation stability, and is preferably 0.01 to 1.5% by mass, and 0.1 to 1% by mass based on the total amount of the composition. More preferred. In addition, when it contains multiple types of antioxidant, a total amount shall be in the said range.

Examples of the rust preventive include metal sulfonate, alkylbenzene sulfonate, dinonylnaphthalene sulfonate, organic phosphite, organic phosphate, organic sulfonate metal, organic phosphate metal, alkenyl succinate, and polyhydric alcohol. Examples thereof include esters and benzotriazole compounds.
The content of the rust inhibitor is preferably 0.01 to 10.0% by mass, more preferably 0.05 to 5.0% by mass, based on the total amount of the composition.

  Examples of the friction modifier include ashless friction modifiers such as aliphatic amines, aliphatic alcohols and aliphatic ethers having at least one alkyl group or alkenyl group having 6 to 30 carbon atoms in the molecule. . The content of the friction modifier is preferably 0.01 to 5.0% by mass based on the total amount of the composition.

  Demulsifiers include, for example, cationic surfactants such as quaternary ammonium salts and imidazolines; polyoxyalkylene block polymers, polyoxyalkylene glycols and polyoxyalkylene polyglycols; alkylene oxide addition of alkylphenol-formaldehyde polycondensates Thing etc. are mentioned. The content of the demulsifier is preferably 0.01 to 5.0% by mass, more preferably 0.02 to 2.0% by mass, based on the total amount of the composition.

The kinematic viscosity at 40 ° C. of the lubricating oil composition in the present embodiment is preferably 70 to 500 mm ² / s. A lubricating oil composition having a 40 ° C. kinematic viscosity of 70 mm ² / s or more is preferable because an oil film is appropriately formed. A kinematic viscosity of 500 mm ² / s or less is preferable because there is no problem such as viscous resistance.
The 40 ° C. kinematic viscosity of the lubricating oil composition is more preferably 90 to 400 mm ² / s, still more preferably 150 to 320 mm ² / s, and particularly preferably 150 to 220 mm ² / s.

<Use of lubricating oil composition>
The lubricating oil composition of this embodiment can be used as a lubricating oil for various applications, but is preferably used as a bearing oil or a gear oil. Among these, in can manufacturing using a coolant as an aqueous processing oil, it can be preferably used as bearing oil or gear oil for a can-making machine drive.
<Lubrication method>
According to this embodiment, the lubricating method which lubricates a bearing part and a gear part can be provided by interposing the said lubricating oil composition in drive parts, such as a bearing part or a gear part. Among them, a lubrication method in which the bearing portion or the gear portion is lubricated with the lubricating oil composition in the presence of a water-based metal working oil used as a coolant in a can manufacturing site is preferable.

  Hereinafter, the present embodiment will be described more specifically by way of examples. However, the present embodiment is not limited to these.

Examples 1-4, Comparative Examples 1-3
Metalworking oil compositions were prepared with the components and proportions shown in Table 1.
Further, the properties and sludge resistance performance of each lubricating oil composition were evaluated by the following evaluation methods. The results are also shown in Table 1.
[Evaluation methods]
(1) Kinematic viscosity Kinematic viscosity at each temperature was measured according to JIS K2283: 2000. Also, the viscosity index was calculated.
(2) Acid value and base value Base number was measured based on JIS K2501: 2003.
(3) Measurement of the amount of calcium and phosphorus in the composition Measurement samples obtained by adding yttrium (Y) as an internal standard element to each lubricating oil composition and diluting with a 4-methyl-2-pentanone / xylene mixed solvent It was. Simultaneous determination of 18 elements was performed on the measurement sample using a simultaneous multi-element quantitative (multi-type) ICP apparatus (manufactured by Shimadzu Corporation, ICPV-1017). Further, only the target elements calcium and phosphorus were selected and quantified with a sequential ICP apparatus (manufactured by Shimadzu Corporation, ICPS-8100).
(4) Sludge resistance The sludge resistance of the lubricating oil composition was examined by performing a gum-up test described below.
<Gum-up test>
A gum-up test was conducted under the following conditions.
The following experiment was conducted using the apparatus shown in FIG. 1 of JIS K 2510: 1998 as a test apparatus. Specifically, 80 g of the lubricating oil composition of each example and comparative example and 20 g of coolant were put in a glass test container of 73 mm × depth 127 mm. Here, a rounded A3003 plate (aluminum test piece) having a size of 2 cm × 10 cm was put, and the test container was covered. A test was performed in which the temperature of the mixture of the lubricating oil composition and the coolant was kept at 80 ° C. using a thermostatic bath and stirred at a rotational speed of 1200 rpm using a stirring rod for 168 hours.
After 168 hours, the mixture was filtered. This filtrate was measured by atomic absorption analysis under the same conditions as in (3) above, and calcium and phosphorus remaining in the filtrate were quantified. Sludge resistance was evaluated from the difference in calcium concentration and phosphorus concentration in the oil before and after the gum-up test.
Coolant: [boron content: 2160 ppm, sodium content: 951 ppm, nitrogen content: 1.31 wt%. Contains triethanolamine, acid value: (JISK 2501: 2003: indicator titration method: 29.7 mg KOH / g)]: diluted with distilled water to 6% -stirring material: stainless steel-heating method: constant temperature bath (heater Oil bath by heating)

<Combination material>
(1) Base oil (A)
Mineral oil 1: 500 N oil (40 ° C. kinematic viscosity: 97.5 mm ² / s, 100 ° C. kinematic viscosity: 10.9 mm ² / s, viscosity index: 96)
・ Mineral oil 2: Bright stock (2) Component (B)
Calcium (Ca) sulfonate 1: (base number: 20 mgKOH / g, JISK 2501: 2003: measured by the perchloric acid method)
Calcium sulfonate / calcium (Ca) sulfonate other than component (B) 2: (base number: 105 mg KOH / g, JISK 2501: 2003: measured by perchloric acid method)
Calcium (Ca) sulfonate 3: (base number: 495 mgKOH / g, JISK 2501: 2003: measured by the perchloric acid method)
(3) Component (C)
Dialkyldithiocarbamate (c1): Methylenebis (dibutyldithiocarbamate Phosphorothioate (c2): Triphenylphosphorothioate (4) Other components Antioxidant 1: (Phenolic antioxidant): Octadecyl 3- (3,5-di -Tert-butyl-4-hydroxyphenyl) propionate / antioxidant 2: (amine antioxidant): monobutylphenyl monooctylphenylamine / demulsifier: ethyleneoxy-propyleneoxy block polymer / rust inhibitor: 1- [N, N-bis (2-ethylhexyl) aminomethyl)] methylbenzotriazole, antifoaming agent: mineral oil dilution of silicone oil

  The following is understood from the results of Examples 1 to 4. That is, when attention is paid to Ca and P among the metal components in the lubricating oil composition, the lubricating oil composition of the present embodiment has a Ca concentration and a P concentration before the test, and a Ca concentration in the filtrate after the gum-up test. And the difference of each of P density | concentration is small compared with a comparative example. The metal content in the lubricating oil composition can cause sludge together with the components of the coolant, and there is a correlation between the difference in concentration after the gum-up test and sludge formation. It can be understood that the amount of sludge can be kept low when the lubricating oil composition of the present embodiment having a small concentration difference after the gum-up test is used. On the other hand, Comparative Example 1 using an overbased calcium sulfonate, although the compound itself is neutral, Comparative Example 2 using tricresyl phosphate having an acid value when water is mixed, and the compound itself are The lubricating oil composition of Comparative Example 3 using isotridecyl acid phosphate, which is acidic, has a difference between the Ca concentration and P concentration before the test and the Ca concentration and P concentration in the filtrate after the gum-up test. Since it is larger than an Example, it turns out that it is inferior to sludge suppression ability.

About the composition of Examples 1-3, the shell four-ball type load-bearing test was done.
<Shell four-ball load bearing test>
In accordance with ASTM D2783-03 (2014), performed under conditions of 1760 rpm for 10 seconds at room temperature, maximum non-seizure load (LNL value, unit N), fusion load (WL value, unit N), and load wear index (LWI value, unit N) was measured. It can be said that the larger this value, the better the load resistance (extreme pressure).

  From the results in Table 2, it can be seen that the lubricating oil composition of this embodiment has load resistance and wear resistance required for ordinary bearing oil and gear oil. From this, it can be seen that the lubricating oil composition of the present embodiment significantly suppresses sludge generation when water-based metalworking oil is mixed and has properties as a normal bearing oil and gear oil.

  According to this embodiment, even when water-based metalworking oil is mixed, the lubricating oil composition that significantly reduces sludge generation in the can-making machine drive unit, and the bearing portion or gear in the presence of water-based metalworking oil. It is possible to provide a lubricating method for lubricating a bearing portion or a gear portion using the lubricating oil composition.

Claims (9)

A base oil (A) having a kinematic viscosity at 40 ° C. of 70 to 500 mm ² / s;
At least one (B) selected from metal sulfonates, metal salicylates and metal phenates having a base number of 10 to 120 mg KOH / g;
At least one selected from dialkyldithiocarbamate (c1) and phosphorothioate (c2) (C)
And a lubricating oil composition.   The lubricating oil composition according to claim 1, wherein the at least one metal (B) selected from metal sulfonates, metal salicylates, and metal phenates is an alkaline earth metal.   The lubricating oil composition according to claim 1 or 2, wherein at least one (B) selected from a metal sulfonate, a metal salicylate, and a metal phenate is a metal sulfonate.   Lubricating oil composition as described in any one of Claims 1-3 which contains 0.1-5 mass% of at least 1 sort (B) chosen from a metal sulfonate, a metal salicylate, and a metal phenate on the basis of the composition whole quantity. object. The lubricating oil composition according to any one of claims 1 to 4, wherein the dialkyldithiocarbamate (c1) has a structure represented by the following general formula (1).

(Wherein R ¹ , R ² , R ³ and R ⁴ each independently represents an alkyl group having 1 to 20 carbon atoms, and may be the same or different from each other. R ⁵ is an alkylene having 1 to 10 carbon atoms. Group). The lubricating oil composition according to any one of claims 1 to 4, wherein the phosphorothioate (c2) has a structure represented by the following general formula (2).

(Wherein R ⁶ , R ⁷ and R ⁸ may each independently have a linear or branched saturated or unsaturated aliphatic hydrocarbon group having 1 to 18 carbon atoms, or a substituent. A saturated or unsaturated alicyclic hydrocarbon group or aromatic hydrocarbon group having 5 to 18 carbon atoms).   It contains at least 1 sort (C) chosen from dialkyl dithiocarbamate (c1) and phosphorothioate (c2) 0.1-2 mass% on the basis of the composition whole quantity, It is any one of Claims 1-6 containing Lubricating oil composition.   The lubricating oil composition according to any one of claims 1 to 7, which is used as bearing oil or gear oil. A method for lubricating a bearing part or a gear part in the presence of an aqueous metalworking oil,
A base oil (A) having a kinematic viscosity at 40 ° C. of 70 to 500 mm ² / s;
At least one (B) selected from metal sulfonates, metal salicylates and metal phenates having a base number of 10 to 120 mg KOH / g;
At least one selected from dialkyldithiocarbamate (c1) and phosphorothioate (c2) (C)
A lubricating method of lubricating a bearing portion or a gear portion using a lubricating oil composition containing