Lubricating oil composition and metal processing method

Abstract

The invention relates to a lubricating oil composition and a metal working method. Provided is a lubricating oil composition containing a base oil (A), N-acyl sarcosine (B), and an alpha-olefin (C). The lubricating oil composition has excellent metal working properties.

Description

[0001] This invention application is a divisional application of PCT patent application PCT / JP2017 / 013133, and its invention patent application is entitled “Lubricating oil composition and metal processing method”. The application number of the parent case entering China is 201780020495.6. Technical Field

[0002] The present invention relates to a lubricating oil composition and a metalworking method using the lubricating oil composition. Background Art

[0003] A lubricating oil composition for metalworking is used when metal or its alloy, particularly non-ferrous metal such as aluminum or aluminum alloy, is subjected to metalworking such as shrinking and bending.

[0004] Lubricating oil compositions for metalworking are required to have excellent metalworking properties as a basic performance. That is, when lubricating oil compositions with poor metalworking properties are used in metalworking, problems such as seizure during shrinking and cracking during bending are more likely to occur.

[0005] Various studies and proposals have been made on lubricating oil compositions for metalworking with the aim of improving metalworking properties.

[0006] For example, Patent Document 1 discloses a lubricating oil composition for metalworking comprising a base oil selected from mineral oils and synthetic oils and containing a glycerol derivative having a specific structure and an oiliness agent in predetermined amounts.

[0007] Patent Document 2 discloses a lubricating oil composition for metalworking comprising a base oil selected from mineral oils and synthetic oils and having a kinematic viscosity at 40° C. within a predetermined range and containing a glycerol derivative having a specific structure in a predetermined amount.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Japanese Patent Application Laid-Open No. 2008-088428

[0011] Patent Document 2: Japanese Patent Application Laid-Open No. 2013-177515. Summary of the Invention

[0012] Problems to be solved by the invention

[0013] However, even the lubricating oil compositions described in Patent Documents 1 and 2 have good metalworking properties to a certain extent, but there is a demand for lubricating oil compositions with further improved metalworking properties.

[0014] An object of the present invention is to provide a lubricating oil composition having excellent metalworking properties and a metalworking method using the lubricating oil composition.

[0015] Means for solving problems

[0016] The present inventors have discovered that a lubricating oil composition using a combination of N-acylsarcosine and α-olefin can solve the above-mentioned problems, thereby completing the present invention.

[0017] That is, the present invention provides the following [1] to [2].

[0018] [1] A lubricating oil composition comprising a base oil (A), an N-acylsarcosine (B), and an α-olefin (C).

[0019] [2] A metalworking method comprising performing metalworking using the lubricating oil composition described in [1].

[0020] Effects of the Invention

[0021] The lubricating oil composition of the present invention has excellent metalworking properties and is useful as a lubricating oil composition for metalworking. DETAILED DESCRIPTION

[0022] [Lubricating oil composition]

[0023] The lubricating oil composition of the present invention contains a base oil (A), N-acylsarcosine (B), and an α-olefin (C).

[0024] The lubricating oil composition of the present invention contains the component (B) and the component (C) in combination, thereby synergistically exhibiting the effect of improving metal workability compared to the case where each component is used alone.

[0025] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of further improving metal workability, the content ratio of component (B) per 100 parts by mass of component (C) is preferably 0.030 parts by mass or more, more preferably 0.050 parts by mass or more, more preferably 0.060 parts by mass or more, even more preferably 0.070 parts by mass or more, still more preferably 0.100 parts by mass or more, and particularly preferably 0.300 parts by mass or more.

[0026] Furthermore, from the viewpoint of obtaining a lubricating oil composition having excellent drying properties, the content ratio of component (B) relative to 100 parts by mass of component (C) is preferably 60 parts by mass or less, more preferably 30 parts by mass or less, more preferably 10 parts by mass or less, further preferably 7 parts by mass or less, even more preferably 5 parts by mass or less, and particularly preferably 2 parts by mass or less.

[0027] In the lubricating oil composition of one embodiment of the present invention, the total content of components (A), (B), and (C) is preferably 70% by mass or more, more preferably 75% by mass or more, even more preferably 80% by mass or more, even more preferably 85% by mass or more, and particularly preferably 90% by mass or more, based on the total amount of the lubricating oil composition (100% by mass), and is usually 100% by mass or less, preferably 99.99% by mass or less.

[0028] The lubricating oil composition of one embodiment of the present invention preferably further contains one or more lubricity agents (D) selected from glycerol derivatives, monohydric alcohols, amines, fatty acids, and fatty acid esters, from the viewpoint of further improving metal workability.

[0029] Furthermore, the lubricating oil composition according to one embodiment of the present invention preferably contains an antioxidant (E) from the viewpoint of improving antioxidant performance.

[0030] The lubricating oil composition of one embodiment of the present invention may further contain other lubricating oil additives in addition to components (B) to (E) within a range not impairing the effects of the present invention.

[0031] In the lubricating oil composition of one embodiment of the present invention, the total content of components (A), (B), (C), (D), and (E) is preferably 75 to 100 mass%, more preferably 80 to 100 mass%, even more preferably 85 to 100 mass%, even more preferably 90 to 100 mass%, and particularly preferably 95 to 100 mass%, based on the total amount of the lubricating oil composition (100 mass%).

[0032] Hereinafter, details of each component contained in the lubricating oil composition of the present invention will be described.

[0033] <Ingredient (A): Base oil>

[0034] The base oil (A) used in the present invention may be either a mineral oil or a synthetic oil, or may be a mixed oil of two or more selected from mineral oils and synthetic oils.

[0035] Examples of mineral oils include atmospheric residues obtained by atmospheric distillation of crude oils such as paraffinic crude oil, intermediate base crude oil, and naphthenic crude oil; distillates obtained by vacuum distillation of these atmospheric residues; mineral oils obtained by subjecting these distillates to one or more refining treatments such as solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, and hydrotreating; and mineral oil waxes obtained by isomerizing waxes produced by the Fischer-Tropsch process (GTL wax (Gas To Liquids WAX)).

[0036] These mineral oils may be used alone or in combination of two or more.

[0037] Examples of synthetic oils include poly-α-olefin synthetic oils such as α-olefin homopolymers or α-olefin copolymers (e.g., α-olefin copolymers having 8 to 14 carbon atoms, such as ethylene-α-olefin copolymers); paraffin synthetic oils such as normal paraffins and isoparaffins; ester synthetic oils such as polyol esters, dibasic acid esters (e.g., ditridecyl glutarate), tribasic acid esters (e.g., 2-ethylhexyl trimellitate), and phosphate esters; ether synthetic oils such as polyphenylene ether; polyalkylene glycols; alkylbenzenes; alkylnaphthalenes; synthetic oils obtained by isomerizing waxes (GTL waxes) produced using the Fischer-Tropsch process, etc.

[0038] These synthetic oils may be used alone or in combination of two or more.

[0039] The base oil (A) used in one embodiment of the present invention preferably contains a synthetic oil, more preferably contains a paraffinic synthetic oil, and even more preferably contains both normal paraffins and isoparaffins, from the viewpoint of improving the drying properties of the lubricating oil composition.

[0040] From the above viewpoints, the content of the synthetic oil in the base oil (A) is preferably 50 to 100 mass%, more preferably 70 to 100 mass%, even more preferably 80 to 100 mass%, even more preferably 90 to 100 mass%, and particularly preferably 100 mass%, based on the total amount of the base oil (A) contained in the lubricating oil composition (100 mass%).

[0041] Furthermore, from the above viewpoints, the content of the paraffinic synthetic oil in the base oil (A) is preferably 50 to 100 mass%, more preferably 70 to 100 mass%, even more preferably 80 to 100 mass%, even more preferably 90 to 100 mass%, and particularly preferably 100 mass%, based on the total amount of the base oil (A) contained in the lubricating oil composition (100 mass%).

[0042] The kinematic viscosity of the base oil (A) at 40°C is preferably 0.5 to 10 mm 2 / s, more preferably 0.75 to 5 mm 2 / s, more preferably 1 to 3 mm 2 / s.

[0043] As long as the kinematic viscosity is 0.5 mm 2 / s or more, the metal workability can be further improved.

[0044] In addition, as long as the kinematic viscosity is 10 mm 2 / s or less, while maintaining excellent metal workability, the handleability also becomes good.

[0045] In addition, in this specification, the kinematic viscosity at 40° C. means a value measured in accordance with JIS K2283:2000.

[0046] Furthermore, from the viewpoint of preparing a lubricating oil composition having improved metalworking properties, the base oil (A) used in one embodiment of the present invention is preferably a base oil for which the kinematic viscosity and viscosity index at 100° C. are difficult to calculate by the measurement method according to JIS K2283:2000 due to its high volatility.

[0047] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of improving lubrication performance, the content of component (A) is preferably 65% ​​by mass or more, more preferably 70% by mass or more, even more preferably 75% by mass or more, and even more preferably 80% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition.

[0048] Furthermore, from the viewpoint of ensuring the contents of components (B) and (C) and providing a lubricating oil composition having excellent metalworking properties, the content of component (A) is preferably 89% by mass or less, more preferably 88% by mass or less, and even more preferably 85% by mass or less, based on the total amount (100% by mass) of the lubricating oil composition.

[0049] <Ingredient (B): N-acylsarcosine>

[0050] The lubricating oil composition of the present invention contains N-acylsarcosine (B).

[0051] In addition, component (B) may be used individually or in combination of 2 or more types.

[0052] As N-acylsarcosine (B), a compound represented by the following general formula (b) is preferred.

[0053] [Chemistry 1]

[0054]

[0055] In the above general formula (b), R represents an alkyl group having 2 to 30 carbon atoms, a cycloalkyl group having 3 to 30 carbon atoms, or an alkenyl group having 3 to 30 carbon atoms.

[0056] Among these, R is preferably an alkyl group having 2 to 30 carbon atoms or an alkenyl group having 3 to 30 carbon atoms.

[0057] Examples of the alkyl group that can be selected as R include ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, hexadecyl, octadecyl, tetracosyl, and hexacosyl.

[0058] The alkyl group may be a linear alkyl group or a branched alkyl group, but is preferably a linear alkyl group.

[0059] The number of carbon atoms in the alkyl group is preferably 2 to 30, more preferably 5 to 26, further preferably 8 to 24, and even more preferably 12 to 20.

[0060] Examples of the cycloalkyl group that can be selected as R include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, and adamantyl.

[0061] The cycloalkyl group may be substituted by an alkyl group having 1 to 10 (preferably 1 to 4) carbon atoms.

[0062] The number of carbon atoms in the cycloalkyl group (the number of carbon atoms in the cycloalkyl group substituted by an alkyl group also includes the number of carbon atoms in the alkyl group) is preferably 3 to 30, more preferably 5 to 26, further preferably 5 to 20, and even more preferably 6 to 15.

[0063] Examples of the alkenyl group that can be selected as R include propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, hexadecenyl, octadecenyl (oleyl), tetracosenyl, and hexacosenyl.

[0064] The alkenyl group may be a straight-chain alkenyl group or a branched-chain alkenyl group, but is preferably a straight-chain alkenyl group.

[0065] The number of carbon atoms in the alkenyl group is preferably 3 to 30, more preferably 5 to 26, further preferably 8 to 24, and even more preferably 12 to 20.

[0066] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of further improving metalworking properties, component (B) preferably contains one or more selected from a compound (B1) represented by the following general formula (b-1) and a compound (B2) represented by the following general formula (b-2).

[0067] [Chemistry 2]

[0068]

[0069] In the general formula (b-1), m is an integer of 1 to 29, preferably 4 to 25, more preferably 7 to 23, and even more preferably 11 to 19.

[0070] Specific examples of compound (B1) include various alkanoylsarcosines, specifically N-lauroylsarcosine (m=11 in formula (b-1)), N-myristoylsarcosine (m=13 in formula (b-1)), and N-palmitoylsarcosine (m=14 in formula (b-1)).

[0071] In the general formula (b-2), p and q are each independently an integer greater than or equal to 0. In this case, p+q is 0 to 27, preferably 2 to 23, more preferably 5 to 21, and even more preferably 9 to 17.

[0072] Specific examples of the compound (B2) include various enoylsarcosines, and more specifically, N-oleoylsarcosine (p=q=7 in the formula (b-2)).

[0073] From the viewpoint of further improving metal workability, the total content of the compound (B1) and the compound (B2) in the component (B) is preferably 70 to 100 mass%, more preferably 80 to 100 mass%, even more preferably 90 to 100 mass%, further preferably 95 to 100 mass%, and particularly preferably 100 mass%, based on the total amount of the component (B) contained in the lubricating oil composition (100 mass%).

[0074] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of improving metal workability, the content of component (B) is preferably 0.001 mass% or more, more preferably 0.005 mass% or more, even more preferably 0.01 mass% or more, still more preferably 0.02 mass% or more, and particularly preferably 0.03 mass% or more, based on the total amount (100 mass%) of the lubricating oil composition.

[0075] Furthermore, from the viewpoint of providing a lubricating oil composition having good drying properties, the content of component (B) is preferably 9% by mass or less, more preferably 4% by mass or less, even more preferably 1.5% by mass or less, still more preferably 0.9% by mass or less, and particularly preferably 0.6% by mass or less, based on the total amount (100% by mass) of the lubricating oil composition.

[0076] <Component (C): α-Olefin>

[0077] The lubricating oil composition of the present invention contains an α-olefin (C).

[0078] In addition, component (C) may be used individually or in combination of 2 or more types.

[0079] The number of carbon atoms of the α-olefin (C) is preferably 8 or more, more preferably 10 or more, and even more preferably 12 or more from the viewpoint of improving metal workability, and is preferably 20 or less, more preferably 16 or less, even more preferably 15 or less, and even more preferably 14 or less from the viewpoint of improving drying properties.

[0080] Examples of the α-olefin (C) include linear olefins having a double bond at the terminal, specifically 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, and 1-octadecene.

[0081] In the lubricating oil composition of one embodiment of the present invention, component (C) preferably contains an α-olefin (C1) having 12 to 14 carbon atoms from the viewpoint of improving drying properties in addition to metalworking properties.

[0082] From the above viewpoints, the content of component (C1) in component (C) is preferably 70 to 100 mass%, more preferably 80 to 100 mass%, even more preferably 90 to 100 mass%, even more preferably 95 to 100 mass%, and particularly preferably 100 mass%, based on the total amount of component (C) contained in the lubricating oil composition (100 mass%).

[0083] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of improving metal workability, the content of component (C) is preferably 10% by mass or more, more preferably 11% by mass or more, and even more preferably 12% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition.

[0084] Furthermore, from the viewpoint of providing a lubricating oil composition with good drying properties, the content of component (C) is preferably 20% by mass or less, more preferably 18% by mass or less, and even more preferably 17% by mass or less, based on the total amount (100% by mass) of the lubricating oil composition.

[0085] <Ingredient (D): Oiliness Agent>

[0086] The lubricating oil composition of one embodiment of the present invention preferably further contains one or more lubricity agents (D) selected from glycerol derivatives, monohydric alcohols, amines, fatty acids, and fatty acid esters, from the viewpoint of further improving metal workability.

[0087] In addition, component (D) may be used individually or in combination of 2 or more types.

[0088] (Glycerol derivatives)

[0089] As the glycerol derivative, a compound represented by the following general formula (d) is preferred.

[0090] [Chemistry 3]

[0091]

[0092] In the above general formula (d), R 1 represents an alkyl group, an alkenyl group, or an arylalkyl group, and is preferably an alkyl group or an alkenyl group.

[0093] R 2 and R 3 Each independently represents a hydrogen atom or a methyl group, preferably a hydrogen atom.

[0094] A 1 and A 2 Each independently represents an alkylene group having 2 to 4 carbon atoms, preferably an ethylene group or a propylene group, more preferably an ethylene group.

[0095] x and y each independently represent a number of 0 or greater, and x+y represents an average added mole number and is a number of 0 to 5, preferably 0.

[0096] z represents an integer of 0 to 2, and is preferably 0 or 1, more preferably 1, from the viewpoint of further improving metal workability.

[0097] It should be noted that, as a 1 The number of carbon atoms in the alkyl group and the alkenyl group is preferably 8-22, more preferably 10-20, and even more preferably 12-18.

[0098] The alkyl group may be a linear alkyl group or a branched alkyl group.

[0099] Furthermore, the alkenyl group may be a straight-chain alkenyl group or a branched-chain alkenyl group.

[0100] As can be selected as R 1 Examples of the alkyl and alkenyl groups include those having 8 to 22 carbon atoms among the above-mentioned alkyl and alkenyl groups that can be selected as R in the general formula (b).

[0101] As can be selected as R 1 The number of carbon atoms in the arylalkyl group is preferably 7-20, more preferably 7-18, and even more preferably 7-16.

[0102] As can be selected as R 1 Examples of the arylalkyl group include benzyl, phenethyl, phenylpropyl, tolylmethyl, tolylethyl, xylylmethyl, and xylylethyl.

[0103] Among the glycerol derivatives used as the component (D), the compound represented by the following general formula (d-1) is more preferable from the viewpoint of further improving metal workability.

[0104] [Chemistry 4]

[0105]

[0106] [In the above general formula (d-1), R 1a represents an alkyl group having 12 to 18 carbon atoms or an alkenyl group having 12 to 18 carbon atoms; z1 represents 0 or 1, preferably 1].

[0107] (monohydric alcohols)

[0108] As the monohydric alcohols, monohydric aliphatic saturated alcohols and monohydric aliphatic unsaturated alcohols are preferred, and they may be linear or branched.

[0109] The number of carbon atoms of the monohydric alcohol is preferably 8 to 22, more preferably 10 to 20, and even more preferably 12 to 18.

[0110] Examples of the monovalent aliphatic saturated alcohol include octanol (octanol), decanol, dodecanol (lauryl alcohol), tetradecanol (myristyl alcohol), cetyl alcohol (cetanol), and stearyl alcohol (stearyl alcohol). Among these, dodecanol (lauryl alcohol) is preferred.

[0111] Examples of the monovalent aliphatic unsaturated alcohol include octenol, decenol, dodecenol, tetradecenol, hexadecenol, and octadecenol (oleyl alcohol). Among these, octadecenol (oleyl alcohol) is preferred.

[0112] (Amines)

[0113] Examples of the amines include primary amines represented by the following general formula (i), secondary amines represented by the following general formula (ii), and quaternary amines represented by the following general formula (iii).

[0114] [Chemistry 5]

[0115]

[0116] In the above general formulas (i) to (iii), R 11 ~R 13 Each is independently an alkyl group, an alkenyl group, or an arylalkyl group, preferably an alkyl group or an alkenyl group, more preferably an alkenyl group.

[0117] As can be selected as R 11 ~R 13The number of carbon atoms in the alkyl group and the alkenyl group is preferably 8-22, more preferably 10-20, and even more preferably 12-18.

[0118] The alkyl group may be a linear alkyl group or a branched alkyl group.

[0119] Furthermore, the alkenyl group may be a straight-chain alkenyl group or a branched-chain alkenyl group.

[0120] It should be noted that, as a 11 ~R 13 Examples of the alkyl and alkenyl groups include those having 8 to 22 carbon atoms among the above-mentioned alkyl and alkenyl groups that can be selected as R in the general formula (b).

[0121] As can be selected as R 11 ~R 13 The number of carbon atoms in the arylalkyl group is preferably 7-20, more preferably 7-18, and even more preferably 7-16.

[0122] As can be selected as R 11 ~R 13 The arylalkyl group can be selected as R in the general formula (d). 1 The groups exemplified by the arylalkyl group.

[0123] Examples of the primary amine represented by the general formula (i) include primary aliphatic amines such as octylamine, laurylamine, stearylamine, and oleylamine; and benzylamine.

[0124] Examples of the secondary amine represented by the general formula (ii) include secondary aliphatic amines such as dioctylamine, dilaurylamine, distearylamine, and dioleylamine; and benzhydrylamine.

[0125] Examples of the quaternary amine represented by the general formula (iii) include quaternary aliphatic amines such as trioctylamine, trilaurylamine, tristearylamine, and trioleylamine; and tritylamine.

[0126] In one embodiment of the present invention, the amine is preferably a primary amine represented by the general formula (i), and more preferably R 11 The primary aliphatic amine is an alkyl or alkenyl group, and more preferably oleylamine.

[0127] (Fatty acids)

[0128] Examples of the fatty acids include saturated fatty acids and unsaturated fatty acids such as palmitic acid, stearic acid, isostearic acid, hydroxystearic acid, dimer acid, oleic acid, and eicosanoic acid.

[0129] The number of carbon atoms of the fatty acid is preferably 8 to 30, more preferably 10 to 24, and even more preferably 12 to 22.

[0130] (Fatty acid esters)

[0131] As the fatty acid esters, esters formed from an aliphatic carboxylic acid having 6 to 22 carbon atoms and an aliphatic alcohol having 1 to 18 carbon atoms are preferred.

[0132] The aliphatic carboxylic acid may be a monobasic acid or a dibasic or higher polybasic acid, and may be either saturated or unsaturated. Furthermore, it may be linear or branched.

[0133] Examples of the aliphatic carboxylic acid include octanoic acid, decanoic acid, dodecanoic acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, hydroxyoctadecanoic acid, eicosanoic acid, octenoic acid, decenoic acid, dodecenoic acid, tetradecenoic acid, hexadecenoic acid, octadecenoic acid, hydroxyoctadecenoic acid, eicosenoic acid, octanedioic acid, decanedioic acid, dodecanedioic acid, tetradecandioic acid, hexadecanedioic acid, octadecandioic acid, eicosandioic acid, octenedioic acid, decenedioic acid, dodecenedioic acid, tetradecenedioic acid, hexadecenedioic acid, octadecenedioic acid, and eicosenedioic acid.

[0134] The aliphatic alcohol may be a monohydric alcohol or a polyhydric alcohol, and may be either saturated or unsaturated. Furthermore, it may be linear or branched.

[0135] Examples of the aliphatic alcohol include methanol, ethanol, allyl alcohol, propanol, butanol, pentanol, hexanol, octanol, decanol, dodecanol, tetradecanol, hexadecanol, octadecanol, butenol, pentenol, hexenol, octenol, decenol, dodecenol, tetradecenol, hexadecenol, and octadecenol.

[0136] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of further improving metalworking properties, the oiliness agent (D) is more preferably at least one selected from glycerol derivatives, monohydric alcohols, and amines, and even more preferably at least one selected from glycerol derivatives and amines.

[0137] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of further improving metal workability, the content of component (D) is preferably 0.001 mass% or more, more preferably 0.005 mass% or more, even more preferably 0.01 mass% or more, still more preferably 0.02 mass% or more, and particularly preferably 0.03 mass% or more, based on the total amount (100 mass%) of the lubricating oil composition.

[0138] Further, the content of the component (D) is preferably 5 mass% or less, more preferably 4 mass% or less, further preferably 1.5 mass% or less, more further preferably 0.9 mass% or less, particularly preferably 0.6 mass% or less, based on the total amount (100 mass%) of the lubricating oil composition, from the viewpoint of producing a lubricating oil composition with good dryability.

[0139] The content ratio of the component (D) to the component (B) 100 parts by mass is preferably 500 parts by mass or less, more preferably 350 parts by mass or less, further preferably 200 parts by mass or less, more further preferably 150 parts by mass or less, in the lubricating oil composition of one embodiment of the present application, from the viewpoint of producing a lubricating oil composition with good dryability.

[0140] The content ratio of the component (D) to the component (B) 100 parts by mass is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, further preferably 25 parts by mass or more, more further preferably 40 parts by mass or more, from the viewpoint of further improving metal workability.

[0141] The content ratio of the component (D) to the component (C) 100 parts by mass is preferably 30 parts by mass or less, more preferably 20 parts by mass or less, more preferably 10 parts by mass or less, further preferably 7 parts by mass or less, more further preferably 5 parts by mass or less, particularly preferably 2 parts by mass or less, in the lubricating oil composition of one embodiment of the present application, from the viewpoint of producing a lubricating oil composition with good dryability.

[0142] The content ratio of the component (D) to the component (C) 100 parts by mass is preferably 0.030 parts by mass or more, more preferably 0.050 parts by mass or more, more preferably 0.060 parts by mass or more, further preferably 0.070 parts by mass or more, more further preferably 0.100 parts by mass or more, particularly preferably 0.300 parts by mass or more, from the viewpoint of further improving metal workability.

[0143] < Component (E): Antioxidant >

[0144] The lubricating oil composition of one embodiment of the present application preferably contains an antioxidant (E) from the viewpoint of improving antioxidant properties.

[0145] As the antioxidant (E), any of known antioxidants conventionally used for lubricating oils can be appropriately selected and used, and examples thereof include amine-based antioxidants, phenol-based antioxidants, sulfur-based antioxidants, molybdenum-based antioxidants, phosphorus-based antioxidants, and the like.

[0146] Note that the component (E) can be used alone or in combination with two or more kinds.

[0147] Examples of the amine antioxidant include diphenylamine-based antioxidants such as diphenylamine and alkylated diphenylamine having an alkyl group having 3 to 20 carbon atoms; and naphthylamine-based antioxidants such as α-naphthylamine, phenyl-α-naphthylamine and substituted phenyl-α-naphthylamine having an alkyl group having 3 to 20 carbon atoms.

[0148] Examples of the phenolic antioxidant include monophenolic antioxidants such as 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol, 2,6-di-tert-butyl-4-ethylphenol, isooctyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; diphenolic antioxidants such as 4,4'-methylenebis(2,6-di-tert-butylphenol) and 2,2'-methylenebis(4-ethyl-6-tert-butylphenol); and hindered phenolic antioxidants.

[0149] Examples of the sulfur-based antioxidant include dilauryl 3,3'-thiodipropionate.

[0150] Examples of the molybdenum-based antioxidant include molybdenum trioxide and / or molybdenum amine complexes obtained by reacting molybdenum acid with an amine compound.

[0151] Examples of the phosphorus-based antioxidant include phosphites and the like.

[0152] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of improving antioxidant performance, the content of component (E) is preferably 0.001% by mass or more, more preferably 0.005% by mass or more, and even more preferably 0.01% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition.

[0153] Furthermore, from the viewpoint of providing a lubricating oil composition with good drying properties, the content of component (E) is preferably 1% by mass or less, more preferably 0.8% by mass or less, and even more preferably 0.5% by mass or less, based on the total amount (100% by mass) of the lubricating oil composition.

[0154] <Other lubricant additives>

[0155] The lubricating oil composition of one embodiment of the present invention may further contain lubricating oil additives other than components (B) to (E) within a range not impairing the effects of the present invention.

[0156] Examples of such lubricating oil additives include extreme pressure agents, anti-wear agents, rust inhibitors, metal inactivators, defoaming agents, viscosity index improvers, and antistatic agents.

[0157] These various lubricating oil additives may be used alone or in combination of two or more.

[0158] The content of each of these lubricating oil additives can be appropriately adjusted within a range not impairing the effects of the present invention, and is generally 0.001 to 10 mass %, preferably 0.005 to 8 mass %, and more preferably 0.01 to 5 mass %, based on the total amount (100 mass %) of the lubricating oil composition.

[0159] [Various physical properties of lubricating oil compositions]

[0160] The kinematic viscosity of the lubricating oil composition of one embodiment of the present invention at 40° C. is preferably 0.5 to 10 mm 2 / s, more preferably 0.75 to 5 mm 2 / s, more preferably 1 to 3 mm 2 / s.

[0161] If the kinematic viscosity is 0.5 mm 2 / s or more, when the lubricating oil composition is used for metal processing, a sufficient lubricating film is formed and the effect of improving the processing performance is easily exhibited.

[0162] Furthermore, if the kinematic viscosity is 10 mm 2 / s or less, the lubricating oil composition has excellent handleability.

[0163] The lubricating oil composition according to one embodiment of the present invention has a friction coefficient measured under the conditions described in the Examples below, preferably less than 0.25, more preferably 0.22 or less, more preferably 0.18 or less, even more preferably 0.16 or less, and even more preferably 0.15 or less.

[0164] If the friction coefficient is less than 0.25, it can be said that the lubricating oil composition is excellent in metal workability.

[0165] [Method for producing lubricating oil composition]

[0166] The method for producing the lubricating oil composition of the present invention is not particularly limited, but is preferably a method comprising the following step (1).

[0167] Step (1): A step of blending N-acylsarcosine (B) and α-olefin (C) into base oil (A).

[0168] In addition, in step (1), components (D) and (E), and lubricating oil additives other than components (B) to (E) may be combined with components (B) and (C).

[0169] In addition, the details of components (A) to (E) (suitable components, content, content ratio with other components, etc.) are as described above.

[0170] After the lubricating oil additives such as components (B) and (C) are blended into the base oil (A), the lubricating oil additives can be uniformly dispersed in the base oil (A) by stirring using a known method.

[0171] [Use of Lubricating Oil Composition]

[0172] The lubricating oil composition of the present invention has excellent metalworking properties and is therefore preferably used for metalworking, more preferably for metalworking of aluminum materials or aluminum alloy materials, and even more preferably for metalworking of aluminum fin materials or aluminum alloy fin materials.

[0173] Furthermore, the lubricating oil composition of the present invention is particularly preferably used for press working of metals, more preferably for press working of aluminum materials or aluminum alloy materials, and even more preferably for press working of aluminum fin materials or aluminum alloy fin materials.

[0174] Metalworking methods

[0175] The metalworking method of the present invention is characterized in that metalworking is performed using the lubricating oil composition of the present invention described above.

[0176] As the metalworking, since the lubricating oil composition of the present invention has excellent metalworking properties, press working of metal is preferred, press working of aluminum materials or aluminum alloy materials is more preferred, and press working of aluminum fin materials or aluminum alloy fin materials is even more preferred.

[0177] In the metalworking method of the present invention, since the lubricating oil composition of the present invention is used, good processing can be performed even under conditions of a draw ratio of 1.5 or greater (further conditions of 1.6 or greater, particularly conditions of 1.7 or greater).

[0178] Example

[0179] Next, the present invention will be described in further detail with reference to Examples, but the present invention is not limited to these Examples.

[0180] In addition, the kinematic viscosity at 40° C. of the base oil used in the following Examples was measured in accordance with JIS K2283:2000.

[0181] Examples 1 to 28, Comparative Examples 1 to 2

[0182] Lubricating oil compositions were prepared by adding base oils and lubricating oil additives in the types and amounts shown in Tables 1 to 3. The base oils and lubricating oil additives shown in Tables 1 to 3 used in the Examples and Comparative Examples are shown below.

[0183] Base oil

[0184] ·Ingredients (A):

[0185] Paraffin-based synthetic oil (containing normal paraffins and isoparaffins), kinematic viscosity at 40°C = 2.1 mm 2 / s, the kinematic viscosity at 100℃ and the viscosity index cannot be calculated.

[0186] <Lubricant Additives>

[0187] Component (B):

[0188] N-oleoylsarcosine: a compound wherein p and q in the aforementioned general formula (b-2) are 7.

[0189] Ingredient (C):

[0190] α-Olefin (C12-C14): an α-olefin having 12 to 14 carbon atoms.

[0191] α-Olefins (C16-C18): α-Olefins having 16 to 18 carbon atoms.

[0192] Ingredient (D):

[0193] Oleyl alcohol: an unsaturated alcohol with 18 carbon atoms.

[0194] Lauryl alcohol: A saturated alcohol with 12 carbon atoms.

[0195] Glycerol derivatives (1): diglycerol monooleyl ether, R in the above general formula (d-1) 1a The compound wherein z1 is 1 and is oleyl.

[0196] Glycerol derivative (2): monoglycerol monooleyl ether, R in the above general formula (d-1) 1a The compound wherein z1 is 0 and is oleyl.

[0197] Ingredient (E):

[0198] Antioxidant: 2,6-di-tert-butyl-p-cresol.

[0199] The lubricating oil compositions prepared in Examples and Comparative Examples were subjected to the following tests to evaluate metalworking properties and drying properties. The results are shown in Tables 1 to 3.

[0200] (1) Metal workability evaluation: reciprocating friction test

[0201] The lubricating oil compositions prepared in the Examples and Comparative Examples were tested for their coefficient of friction at the 200th sliding stroke using a reciprocating friction and wear tester (manufactured by A&D Co., Ltd., product name "AFT-15M-A") under the following test conditions. A lubricating oil composition with a lower coefficient of friction is considered to have superior metalworking properties.

[0202] (Test conditions)

[0203] Ball material: SUJ2, 1 / 2 inch diameter

[0204] Sliding material: A1050 without surface treatment

[0205] Temperature: 35°C

[0206] Load capacity: 3kgf

[0207] Sliding speed: 20mm / s

[0208] Sliding distance: 40mm

[0209] · Sample oil amount: Apply smoothly.

[0210] (2) Drying evaluation: Drying test

[0211] 3 g of the lubricating oil compositions prepared in Examples and Comparative Examples were collected into a glass dish with a diameter of 51 mm, the mass of which had been previously measured. The dish was then placed, uncovered, in a thermostatic bath (manufactured by TABAI, product name: "SAFETY OVENSPH-200") at 130°C. The residual mass of the lubricating oil composition was measured after 45 minutes and 60 minutes, and the residual rate (%) was calculated according to the following formula.

[0212] [Residual rate (%) after 45 minutes or 60 minutes]=([Residual mass (g) of the lubricating oil composition after 45 minutes or 60 minutes] / [Mass of the lubricating oil composition before the test (i.e., 3 g)])×100.

[0213] [Table 1]

[0214]

[0215] [Table 2]

[0216]

[0217] [Table 3]

[0218]

[0219] According to Tables 1 to 3, the lubricating oil compositions prepared in Examples 1 to 28 had lower friction coefficients and were superior in metal workability compared to the lubricating oil compositions prepared in Comparative Examples 1 and 2.

Claims

1. A lubricating oil composition comprising a base oil (A), N-acylsarcosine (B), and an α-olefin (C) having 12 to 14 carbon atoms. The content of the component (B) is 0.9% by mass or less based on the total amount of the lubricating oil composition. The content of the component (C) is 10% by mass or more and less than 20% by mass based on the total amount of the lubricating oil composition.

2. The lubricating oil composition according to claim 1, wherein The base oil (A) is at least one selected from mineral oils and synthetic oils.

3. The lubricating oil composition according to claim 1 or 2, wherein The base oil (A) contains synthetic oil.

4. The lubricating oil composition according to any one of claims 1 to 3, wherein The synthetic oil in the base oil (A) is one or more selected from the group consisting of polyα-olefin synthetic oils, paraffin synthetic oils, ester synthetic oils, ether synthetic oils, polyalkylene glycols, alkylbenzenes, alkylnaphthalenes, and synthetic oils obtained by isomerizing natural gas synthetic wax.

5. The lubricating oil composition according to any one of claims 1 to 4, wherein The base oil (A) contains a paraffinic synthetic oil.

6. The lubricating oil composition according to any one of claims 1 to 5, wherein The content of the synthetic oil in the base oil (A) is 50 to 100% by mass based on the total amount of the base oil (A) contained in the lubricating oil composition.

7. The lubricating oil composition according to any one of claims 1 to 6, wherein The content of the paraffinic synthetic oil in the base oil (A) is 50 to 100% by mass based on the total amount of the base oil (A) contained in the lubricating oil composition.

8. The lubricating oil composition according to any one of claims 1 to 7, wherein The kinematic viscosity of the base oil (A) at 40°C is 0.5 to 10 mm 2 / s.

9. The lubricating oil composition according to any one of claims 1 to 8, wherein The content of component (A) is 65% by mass or more based on the total amount of the lubricating oil composition.

10. The lubricating oil composition according to any one of claims 1 to 9, wherein The content of component (A) is 89% by mass or less based on the total amount of the lubricating oil composition.

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