JP6856296B2 - Lubricating oil composition and metal processing method - Google Patents

Description

The present invention relates to a lubricating oil composition and a metal processing method using the lubricating oil composition.

When performing metal processing such as ironing or bending of a metal or an alloy thereof, particularly a non-ferrous metal such as aluminum or an aluminum alloy, a lubricating oil composition for metal processing is used.
The lubricating oil composition for metal processing is required to have excellent metal workability as a performance that should be basically possessed. When a lubricating oil composition having poor workability is used for metal processing, for example, it tends to cause seizure in ironing and cracking in bending.

As a lubricating oil composition suitable for metal processing, various studies and proposals have been made in order to improve metal workability.
For example, Patent Documents 1 and 2 disclose a lubricating oil composition for metal processing containing a glycerin derivative having a specific structure and an oily agent in a predetermined amount in a base oil selected from mineral oils and synthetic oils.
Further, Patent Document 2 describes a lubricating oil composition for metal processing, which is selected from mineral oils and synthetic oils and contains a predetermined amount of a glycerin derivative having a specific structure in a base oil having a kinematic viscosity at 40 ° C. in a predetermined range. It is disclosed.

Japanese Unexamined Patent Publication No. 2008-08428 Japanese Unexamined Patent Publication No. 2013-177515

However, the lubricating oil compositions described in Patent Documents 1 and 2 also have good metal workability, but there is a demand for a lubricating oil composition having further improved metal workability.
An object of the present invention is to provide a lubricating oil composition having excellent metal workability and a metal processing method using the lubricating oil composition.

The present inventor has found that a lubricating oil composition using N-acylsarcosine and α-olefin in combination can solve the above problems, and has completed the present invention.
That is, the present invention provides the following [1] to [2].

[1] A lubricating oil composition containing a base oil (A), N-acylsarcosine (B), and α-olefin (C).
[2] A metal processing method for performing metal processing using the lubricating oil composition according to the above [1].

The lubricating oil composition of the present invention has excellent metal workability and is useful as a lubricating oil composition for metal processing.

[Lubricating oil composition]
The lubricating oil composition of the present invention contains a base oil (A), N-acylsarcosine (B), and an α-olefin (C).
In the lubricating oil composition of the present invention, by containing the component (B) and the component (C) in combination, the effect of improving the metal workability is greater than when each of them is used alone.

In the lubricating oil composition of one aspect of the present invention, the content ratio of the component (B) to 100 parts by mass of the component (C) is preferably 0.030 parts by mass or more from the viewpoint of further improving the metal workability. , More preferably 0.050 parts by mass or more, more preferably 0.060 parts by mass or more, still 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. That is all.
Further, from the viewpoint of obtaining a lubricating oil composition having good drying property, the content ratio of the component (B) to 100 parts by mass of the 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, still more preferably 5 parts by mass or less, and particularly preferably 2 parts by mass or less.

In the lubricating oil composition of one aspect of the present invention, the total content of the components (A), (B) and (C) is preferably 70% by mass based on the total amount (100% by mass) of the lubricating oil composition. The above is more preferably 75% by mass or more, further preferably 80% by mass or more, still more preferably 85% by mass or more, particularly preferably 90% by mass or more, and usually 100% by mass or less, preferably 99.99%. It is mass% or less.

The lubricating oil composition of one aspect of the present invention is one or more oily properties selected from glycerin derivatives, monohydric alcohols, amines, fatty acids, and fatty acid esters from the viewpoint of further improving metal workability. It is preferable to contain the agent (D).
Further, the lubricating oil composition according to one aspect of the present invention preferably contains an antioxidant (E) from the viewpoint of improving the antioxidant performance.
The lubricating oil composition according to one aspect of the present invention may further contain additives for lubricating oil other than the components (B) to (E) as long as the effects of the present invention are not impaired.

In the lubricating oil composition of one aspect of the present invention, the total content of the components (A), (B), (C), (D) and (E) is the total amount (100% by mass) of the lubricating oil composition. By reference, it is preferably 75 to 100% by mass, more preferably 80 to 100% by mass, still more preferably 85 to 100% by mass, still more preferably 90 to 100% by mass, and particularly preferably 95 to 100% by mass.

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

<Ingredient (A): Base oil>
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 in which two or more kinds selected from the mineral oil and the synthetic oil are used in combination.

Examples of the mineral oil include atmospheric residual oil obtained by atmospheric distillation of crude oils such as paraffin-based mineral oil, intermediate base mineral oil, and naphthenic mineral oil; and distillate oil obtained by vacuum distillation of these atmospheric residual oils. ; Mineral oil that has undergone one or more purification treatments such as solvent removal, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, etc .; by the Fisher-Tropsch method, etc. Examples thereof include mineral oil wax obtained by isomerizing the produced wax (GTL wax (Gas To Liquids WAX)).
These mineral oils may be used alone or in combination of two or more.

Examples of the synthetic oil include poly such as an α-olefin homopolymer or an α-olefin copolymer (for example, an α-olefin copolymer having 8 to 14 carbon atoms such as an ethylene-α-olefin copolymer). α-Olefin synthetic oil; Paraffin-based synthetic oil such as normal paraffin and isoparaffin; polyol ester, dibasic acid ester (for example, ditridecylglutarate, etc.), tribasic acid ester (for example, 2-ethylhexyl trimellitic acid), Ester-based synthetic oil such as phosphoric acid ester; Ether-based synthetic oil such as polyphenyl ether; Polyalkylene glycol; Alkylbenzene; Alkylnaphthalene; Obtained by isomerizing a wax (GTL wax) produced by the Fischer-Tropsch method or the like. Examples include synthetic oils and the like.
These synthetic oils may be used alone or in combination of two or more.

The base oil (A) used in one aspect of the present invention preferably contains a synthetic oil, and more preferably a paraffin-based synthetic oil, from the viewpoint of improving the drying property of the lubricating oil composition.

From the above viewpoint, the content ratio of the synthetic oil in the base oil (A) is preferably 50 to 100% by mass, more preferably 50 to 100% by mass, based on the total amount (100% by mass) of the base oil (A) contained in the lubricating oil composition. Is 70 to 100% by mass, more preferably 80 to 100% by mass, still more preferably 90 to 100% by mass, and particularly preferably 100% by mass.

From the above viewpoint, the content ratio of the paraffin-based synthetic oil in the base oil (A) is based on the total amount (100% by mass) of the base oil (A) contained in the lubricating oil composition, and is preferably 50 to 100% by mass. %, More preferably 70 to 100% by mass, still more preferably 80 to 100% by mass, still more preferably 90 to 100% by mass, and particularly preferably 100% by mass.

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, and even more preferably 1 to 3 mm 2 / s.
When the kinematic viscosity is 0.5 mm ² / s or more, the metal workability can be further improved.
Further, when the kinematic viscosity is 10 mm ² / s or less, excellent metal workability can be maintained and handleability is also good.
In addition, in this specification, the kinematic viscosity at 40 degreeC means the value measured according to JIS K2283: 2000.
Further, from the viewpoint of preparing a lubricating oil composition having improved metal workability, the base oil (A) used in one embodiment of the present invention has high volatility, and therefore, a measurement method based on JIS K2283: 2000. Therefore, a base oil whose kinematic viscosity and viscosity index at 100 ° C. are difficult to calculate is preferable.

In the lubricating oil composition of one aspect of the present invention, the content of the component (A) is preferably 65% by mass based on the total amount (100% by mass) of the lubricating oil composition from the viewpoint of improving the lubricating performance. As mentioned above, it is more preferably 70% by mass or more, further preferably 75% by mass or more, and even more preferably 80% by mass or more.
Further, from the viewpoint of ensuring the contents of the components (B) and (C) and making the lubricating oil composition excellent in metal workability, the content of the component (A) is the total mass (100) of the lubricating oil composition. By mass%), it is preferably 89% by mass or less, more preferably 88% by mass or less, and further preferably 85% by mass or less.

<Component (B): N-acylsarcosine>
The lubricating oil composition of the present invention contains N-acylsarcosine (B).
The component (B) may be used alone or in combination of two or more.
The N-acylsarcosine (B) is preferably a compound represented by the following general formula (b).

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, and an alkyl group having 2 to 30 carbon atoms. , Or an alkenyl group having 3 to 30 carbon atoms is preferable.

Examples of the alkyl group that can be selected as R include an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group and a tridecyl group. Examples thereof include a tetradecyl group, a hexadecyl group, an octadecyl group, a tetracosyl group and a hexacosyl group.
The alkyl group may be a straight chain alkyl group or a branched chain alkyl group.
The alkyl group has 2 to 30 carbon atoms, preferably 5 to 26, more preferably 8 to 24, and even more preferably 12 to 20.

Examples of the cycloalkyl group that can be selected as R include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantyl group and the like.
The cycloalkyl group may be substituted with an alkyl group having 1 to 10 carbon atoms (preferably 1 to 4).
The carbon number of the cycloalkyl group (the cycloalkyl group substituted with the alkyl group also includes the carbon number of the alkyl group) is 3 to 30, preferably 5 to 26, and more preferably 5 to 20. , More preferably 6 to 15.

Examples of the alkenyl group that can be selected as R include a propenyl group, a butenyl group, a pentenyl group, a hexenyl group, a heptenyl group, an octenyl group, a nonenyl group, a decenyl group, an undecenyl group, a dodecenyl group, a tridecenyl group and a tetradecenyl group. Examples thereof include a hexadecenyl group, an octadecenyl group, a tetracosenyl group, a hexacosenyl group and the like.
The alkenyl group may be a straight chain alkenyl group or a branched chain alkenyl group.
The alkenyl group has 3 to 30 carbon atoms, preferably 5 to 26, more preferably 8 to 24, and even more preferably 12 to 20.

In the lubricating oil composition of one aspect of the present invention, from the viewpoint of further improving the metal workability, the component (B) is the compound (B1) represented by the following general formula (b-1) and the following general formula (b). It is preferable to contain at least one selected from the compound (B2) represented by -2).

In the above general formula (b-1), m is an integer of 1 to 29, but is preferably 4 to 25, more preferably 7 to 23, and even more preferably 11 to 19.
Specific examples of the compound (B1) include various alkylsarcosines, and specifically, N-lauroylsarcosine (m = 11 in the formula (b-1)) and N-myristoylation sarcosine (formula (b-1)). ), N-palmitoyl sarcosine (m = 14 in the formula (b-1)) and the like.

Further, in the above general formula (b-2), p and q are each independently an integer of 0 or more. However, p + q is 0 to 27, preferably 2 to 23, more preferably 5 to 21, and even more preferably 9 to 17.
Specific examples of the compound (B2) include various alkenyl sarcosine, and specific examples thereof include N-oleyl sarcosine (p = q = 7 in the formula (b-2)).

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

In the lubricating oil composition of one aspect of the present invention, from the viewpoint of improving metal workability, the content of the component (B) is preferably 0.001 based on the total amount (100% by mass) of the lubricating oil composition. It is by mass% or more, more preferably 0.005% by mass or more, still more preferably 0.01% by mass or more, still more preferably 0.02% by mass or more, and particularly preferably 0.03% by mass or more.
Further, from the viewpoint of obtaining a lubricating oil composition having good drying property, the content of the component (B) is preferably 9% by mass or less, more preferably 9% by mass or less, based on the total amount (100% by mass) of the lubricating oil composition. It is 4% by mass or less, 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.

<Component (C): α-olefin>
The lubricating oil composition of the present invention contains an α-olefin (C).
The component (C) may be used alone or in combination of two or more.

The carbon number of the α-olefin (C) is preferably 8 or more, more preferably 10 or more, still more preferably 12 or more from the viewpoint of improving metal workability, and from the viewpoint of improving dryness. It is preferably 20 or less, more preferably 16 or less, still more preferably 15 or less, and even more preferably 14 or less.

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

In the lubricating oil composition of one aspect of the present invention, it is preferable that the component (C) contains an α-olefin (C1) having 12 to 14 carbon atoms from the viewpoint of improving the dryness as well as the metalworkability.
From the above viewpoint, the content ratio of the component (C1) in the component (C) is preferably 70 to 100% by mass based on the total amount (100% by mass) of the component (C) contained in the lubricating oil composition. It is preferably 80 to 100% by mass, more preferably 90 to 100% by mass, still more preferably 95 to 100% by mass, and particularly preferably 100% by mass.

In the lubricating oil composition of one aspect of the present invention, from the viewpoint of improving metal workability, the content of the component (C) is preferably 10% by mass based on the total amount (100% by mass) of the lubricating oil composition. As mentioned above, it is more preferably 11% by mass or more, still more preferably 12% by mass or more.
Further, from the viewpoint of obtaining a lubricating oil composition having good drying property, the content of the component (C) is preferably 20% by mass or less, more preferably 20% by mass or less, based on the total amount (100% by mass) of the lubricating oil composition. It is 18% by mass or less, more preferably 17% by mass or less.

<Ingredient (D): Oily agent>
The lubricating oil composition of one aspect of the present invention is one or more oily properties selected from glycerin derivatives, monohydric alcohols, amines, fatty acids, and fatty acid esters from the viewpoint of further improving metal workability. It is preferable to contain the agent (D).
The component (D) may be used alone or in combination of two or more.

(Glycerin derivative)
As the glycerin derivative, a compound represented by the following general formula (d) is preferable.

In the 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.
R ² and R ³ each independently represent a hydrogen atom or a methyl group, but are preferably hydrogen atoms.
A ¹ and A ² each independently represent an alkylene group having 2 to 4 carbon atoms, but are preferably an ethylene group or a propylene group, and more preferably an ethylene group.
x and y each independently represent a number of 0 or more, and x + y represents a number of 0 to 5 in terms of the average number of moles added, but is preferably 0.
Although z represents an integer of 0 to 2, it is preferably 0 or 1, and more preferably 1 from the viewpoint of further improving metal workability.

The ^{number of carbon atoms of the alkyl group and the alkenyl group that can be selected as R 1} is preferably 8 to 22, more preferably 10 to 20, and even more preferably 12 to 18.
The alkyl group may be a straight chain alkyl group or a branched chain alkyl group.
Further, the alkenyl group may also be a straight chain alkenyl group or a branched chain alkenyl group.
As the ^{alkyl group and alkenyl group that can be selected as R 1} , among those listed as the alkyl group and alkenyl group that can be selected as R in the above general formula (b), the alkyl group having 8 to 22 carbon atoms and the alkenyl group have 8 to 22 carbon atoms. Alkyl groups can be mentioned.

The ^{number of carbon atoms of the arylalkyl group that can be selected as R 1} is preferably 7 to 20, more preferably 7 to 18, and even more preferably 7 to 16.
Examples of the arylalkyl group that can be selected as R ¹ include a benzyl group, a phenethyl group, a phenylpropyl group, a tolylmethyl group, a tolylethyl group, a xsilylmethyl group, and a xsilylethyl group.

〔前記一般式（ｄ−１）中、Ｒ^１ａは、炭素数１２〜１８のアルキル基、又は、炭素数１２〜１８のアルケニル基を示す。ｚ１は、０又は１を示すが、１であることが好ましい。〕 Among the glycerin 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 the metal workability.

[In the 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. Although z1 represents 0 or 1, it is preferably 1. ]

(Monohydric alcohols)
As the monohydric alcohols, monohydric aliphatic saturated alcohols and monovalent aliphatic unsaturated alcohols are preferable, and they may be linear or branched.
The carbon number of the monohydric alcohol is preferably 8 to 22, more preferably 10 to 20, and even more preferably 12 to 18.

Examples of monovalent aliphatic saturated alcohols include octanol (capryl alcohol), decanol, dodecanol (lauryl alcohol), tetradecanol (myristyl alcohol), hexadecanol (cetyl alcohol, cetanol), and octadecanol (stearyl alcohol). ), Etc., and among these, dodecanol (lauryl alcohol) is preferable.
Examples of the monovalent aliphatic unsaturated alcohol include octenol, decenol, dodecenol, tetradecenol, hexadecenol, octadecenol (oleyl alcohol, linolyl alcohol), and among these, octadecenol (oleyl alcohol, linolyl alcohol). Is preferable.

(Amines)
Examples of amines include primary amines represented by the following general formula (i), secondary amines represented by the following general formula (ii), and tertiary amines represented by the following general formula (iii). Can be mentioned.

In the above general formulas (i) to (iii), R ^{11 to} R ¹³ are independently alkyl groups, alkenyl groups, or arylalkyl groups, preferably alkyl groups or alkenyl groups, and are alkenyl groups. More preferably.

The ^{number of carbon atoms of the alkyl group and the alkenyl group that can be selected as R 11 to} R ¹³ is preferably 8 to 22, more preferably 10 to 20, and even more preferably 12 to 18.
The alkyl group may be a straight chain alkyl group or a branched chain alkyl group.
Further, the alkenyl group may also be a straight chain alkenyl group or a branched chain alkenyl group.
The ^{alkyl group and alkenyl group that can be selected as R 11 to} R ¹³ have 8 to 8 carbon atoms among those listed as the alkyl group and alkenyl group that can be selected as R in the above general formula (b). Twenty-two alkyl and alkenyl groups are mentioned.

The ^{number of carbon atoms of the arylalkyl group that can be selected as R 11 to} R ¹³ is preferably 7 to 20, more preferably 7 to 18, and even more preferably 7 to 16.
Examples of the arylalkyl group that can be selected as R ^{11 to} R ¹³ include those exemplified as the arylalkyl group that can be selected as ^{R 1 in} the above general formula (d).

Examples of the primary amine represented by the general formula (i) include primary aliphatic amines such as octylamine, laurylamine, stearylamine and oleylamine, and benzylamine and the like.
Examples of the secondary amine represented by the general formula (ii) include secondary aliphatic amines such as dioctylamine, dilaurylamine, distearylamine, and dioleylamine, and dibenzylamine.
Examples of the tertiary amine represented by the general formula (iii) include tertiary aliphatic amines such as trioctylamine, trilaurylamine, tristealylamine, and trioleylamine, and tribenzylamine.

In one aspect of the present invention, as the amines, the primary amine represented by the general formula (i) is preferable, and the primary amine in which R ¹¹ in the general formula (i) is an alkyl group or an alkenyl group is preferable. Aliphatic amines are more preferred, and oleyl amines are even more preferred.

(Fatty acids)
Examples of fatty acids include saturated fatty acids such as palmitic acid, stearic acid, isostearic acid, hydroxystearic acid, dimer acid, oleic acid, and icosanoic acid, or unsaturated fatty acids.
The number of carbon atoms of the fatty acid is preferably 8 to 30, more preferably 10 to 24, and further preferably 12 to 22.

(Fatty acid esters)
As the fatty acid esters, esters composed of an aliphatic carboxylic acid having 6 to 22 carbon atoms and an aliphatic alcohol having 1 to 18 carbon atoms are preferable.

The aliphatic carboxylic acid may be a monobasic acid, a polybasic acid of dibasic acid or more, and may be saturated or unsaturated. Further, it may be linear or may have a branched chain.
Examples of the aliphatic carboxylic acid include octanoic acid, decanoic acid, dodecanoic acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, hydroxyoctadecanoic acid, icosanoic acid, octenoic acid, decenoic acid, dodecenoic acid, tetradecenoic acid and hexadecenoic acid. Octadecenoic acid, hydroxyoctadecenoic acid, icosenic acid, octane diic acid, decane diic acid, dodecane diic acid, tetradecane diic acid, hexadecane diic acid, octadecane diic acid, icosan diic acid, octene diic acid, decenoic acid, dodecene diic acid , Tetradecene diic acid, hexadecene diic acid, octadecene diic acid, icosene diic acid and the like.

The aliphatic alcohol may be a monohydric alcohol, a polyhydric alcohol, or may be saturated or unsaturated. Further, it may be linear or branched.
Examples of the fatty alcohol include methanol, ethanol, allyl alcohol, propanol, butanol, pentanol, hexanol, octanol, decanol, dodecanol, tetradecanol, hexadecanol, octadecanol, butanol, pentenol, and hexanol. Examples thereof include octanol, decenol, dodecenol, tetradecenol, hexadecenol, octadecenol and the like.

In the lubricating oil composition of one aspect of the present invention, the oily agent (D) is one or more selected from glycerin derivatives, monohydric alcohols, and amines from the viewpoint of further improving metal workability. More preferably, it is more preferably one or more selected from glycerin derivatives and amines.

In the lubricating oil composition of one aspect of the present invention, from the viewpoint of further improving the metal workability, the content of the component (D) is preferably 0. It is 001% by mass or more, more preferably 0.005% by mass or more, still more preferably 0.01% by mass or more, still more preferably 0.02% by mass or more, and particularly preferably 0.03% by mass or more.
Further, from the viewpoint of obtaining a lubricating oil composition having good drying property, the content of the component (D) is preferably 5% by mass or less, more preferably 5% by mass or less, based on the total amount (100% by mass) of the lubricating oil composition. It is 4% by mass or less, 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.

In the lubricating oil composition of one aspect of the present invention, the content ratio of the component (D) to 100 parts by mass of the component (B) is preferably 500 parts by mass from the viewpoint of obtaining a lubricating oil composition having good drying property. Hereinafter, it is more preferably 350 parts by mass or less, further preferably 200 parts by mass or less, and even more preferably 150 parts by mass or less.
Further, from the viewpoint of further improving the metal workability, the content ratio of the component (D) to 100 parts by mass of the component (B) is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, and further preferably 25. It is 40 parts by mass or more, more preferably 40 parts by mass or more.

In the lubricating oil composition of one aspect of the present invention, the content ratio of the component (D) to 100 parts by mass of the component (C) is preferably 30 parts by mass from the viewpoint of obtaining a lubricating oil composition having good drying properties. Below, it is more preferably 20 parts by mass or less, more preferably 10 parts by mass or less, still more preferably 7 parts by mass or less, still more preferably 5 parts by mass or less, and particularly preferably 2 parts by mass or less.
Further, from the viewpoint of further improving the metal workability, the content ratio of the component (D) to 100 parts by mass of the component (C) is preferably 0.030 parts by mass or more, more preferably 0.050 parts by mass or more. It is more preferably 0.060 parts by mass or more, further 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.

<Component (E): Antioxidant>
The lubricating oil composition of one aspect of the present invention preferably contains an antioxidant (E) from the viewpoint of improving the antioxidant performance.
As the antioxidant (E), any known antioxidant that has been conventionally used as an antioxidant for lubricating oil can be appropriately selected and used. For example, an amine-based antioxidant can be used. , Phenolic antioxidants, sulfur antioxidants, molybdenum antioxidants, phosphorus antioxidants and the like.
The component (E) may be used alone or in combination of two or more.

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

Examples of the phenolic antioxidant include 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol, and 2,6-di-tert-butyl-4-ethylphenol. Monophenolic antioxidants such as isooctyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate and octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate Agents; diphenolic antioxidants such as 4,4'-methylenebis (2,6-di-tert-butylphenol), 2,2'-methylenebis (4-ethyl-6-tert-butylphenol); hinderedphenols Antioxidants; etc.

Examples of the sulfur-based antioxidant include dilauryl-3,3'-thiodipropionate and the like.
Examples of the molybdenum-based antioxidant include a molybdenum amine complex formed by reacting molybdenum trioxide and / or molybdic acid with an amine compound.
Examples of the phosphorus-based antioxidant include phosphite and the like.

In the lubricating oil composition of one aspect of the present invention, from the viewpoint of improving the antioxidant performance, the content of the component (E) is preferably 0.001 based on the total amount (100% by mass) of the lubricating oil composition. It is mass% or more, more preferably 0.005 mass% or more, still more preferably 0.01 mass% or more.
Further, from the viewpoint of obtaining a lubricating oil composition having good drying property, the content of the component (E) is preferably 1% by mass or less, more preferably 1% by mass or less, based on the total amount (100% by mass) of the lubricating oil composition. It is 0.8% by mass or less, more preferably 0.5% by mass or less.

<Additives for other lubricating oils>
The lubricating oil composition of one aspect of the present invention may further contain additives for lubricating oil other than the components (B) to (E) as long as the effects of the present invention are not impaired.
Examples of such an additive for a lubricating oil include an extreme pressure agent, an abrasion resistant agent, a rust preventive agent, a metal inactivating agent, a defoaming agent, a viscosity index improver, an antistatic agent and the like.
These various additives for lubricating oil may be used alone or in combination of two or more.

The content of each of these additives for lubricating oil is appropriately adjusted within a range that does not impair the effects of the present invention, but is usually 0.001 to 10 based on the total amount (100% by mass) of the lubricating oil composition. It is by mass, preferably 0.005 to 8% by mass, and more preferably 0.01 to 5% by mass.

[Various physical properties of lubricating oil composition]
The kinematic viscosity of the lubricating oil composition of one aspect 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, and even more preferably 1 to 3 mm 2 / s. s.
When the kinematic viscosity is 0.5 mm ² / s or more, when the lubricating oil composition is used for metal processing, the effect of forming a sufficient lubricating film and enhancing the processing performance is likely to be exhibited.
Further, when the kinematic viscosity is 10 mm ² / s or less, the handleability of the lubricating oil composition is excellent.

Using the lubricating oil composition of one aspect of the present invention, the coefficient of friction measured under the conditions described in Examples described later is preferably less than 0.25, more preferably 0.22 or less, and more preferably 0. It is .18 or less, more preferably 0.16 or less, and even more preferably 0.15 or less.
If the friction coefficient is less than 0.25, it can be said that the lubricating oil composition has excellent metal workability.

[Manufacturing method of lubricating oil composition]
The method for producing the lubricating oil composition of the present invention is not particularly limited, but a method having the following step (1) is preferable.
Step (1): A step of blending N-acylsarcosine (B) and α-olefin (C) with the base oil (A).

In the step (1), in addition to the components (B) and (C), additives for lubricating oil other than the components (D), (E), and the components (B) to (E) are further blended. May be good.
The details of the components (A) to (E) (suitable component, content, content ratio with other components, etc.) are as described above.

Lubricating oil additives such as components (B) and (C) are added to the base oil (A) and then stirred by a known method to make the lubricating oil additives uniform in the base oil (A). It is preferable to disperse in.

[Use of lubricating oil composition]
Since the lubricating oil composition of the present invention has excellent metal workability, it is preferably used for metal processing, more preferably used for metal processing of aluminum materials or aluminum alloy materials, and aluminum fin materials or aluminum alloys. It is more preferably used for metal processing of fin materials.

Further, the lubricating oil composition of the present invention is particularly preferably used for press working of a metal, more preferably used for press working of an aluminum material or an aluminum alloy material, and of an aluminum fin material or an aluminum alloy fin material. It is more preferably used for press working.

[Metal processing method]
The metal processing method of the present invention is characterized in that metal processing is performed using the above-mentioned lubricating oil composition of the present invention.
As the metal processing, since the lubricating oil composition of the present invention has excellent metal workability, press processing of metal is preferable, press processing of aluminum material or aluminum alloy material is more preferable, and aluminum fin material or aluminum alloy fin. Pressing of the material is more preferred.
Since the above-mentioned lubricating oil composition of the present invention is used in the metal processing method of the present invention, for example, even if the drawing ratio is 1.5 or more, the condition is 1.6 or more. Good processing can be performed even under the conditions of 1.7 or more.

Next, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these examples.
The kinematic viscosity of the base oil used in the following examples at 40 ° C. was measured according to JIS K2283: 2000.

Examples 1-28, Comparative Examples 1-2
Lubricating oil compositions were prepared by adding base oils and lubricant additives according to the types and blending amounts shown in Tables 1 to 3. The base oil and lubricating oil additives shown in Tables 1 to 3 used in Examples and Comparative Examples are as follows.

<Base oil>
・ Ingredient (A):
Paraffin-based synthetic oil (containing normal paraffin and isoparaffin, 40 ° C. kinematic viscosity = 2.1 mm ² / s.
<Additives for lubricating oil>
・ Ingredient (B):
N-oleyl sarcosine: A compound having p = q = 7 in the general formula (b-2).
-Component (C):
α-olefin (C12-C14): An α-olefin having 12 to 14 carbon atoms.
α-olefin (C16-C18): An α-olefin having 16 to 18 carbon atoms.
-Component (D):
Oleyl alcohol: An unsaturated alcohol with 18 carbon atoms.
Lauryl alcohol: Saturated alcohol with 12 carbon atoms.
Glycerin derivative (1): Diglycerin monooleyl ether, ^{a compound in which R 1a} in the general formula (d-1) is an oleyl group and z1 = 1.
Glycerin derivative (2): Monoglycerin monooleyl ether, ^{a compound in which R 1a} in the general formula (d-1) is an oleyl group and z1 = 0.
・ Ingredient (E):
Antioxidant: 2,6-di-tert-butyl-p-cresol.

The following tests were carried out on the lubricating oil compositions prepared in Examples and Comparative Examples to evaluate the metal workability and the drying property. These results are shown in Tables 1-3.

(1) Metalworkability evaluation: Reciprocating friction and friction test For the lubricating oil compositions prepared in Examples and Comparative Examples, the reciprocating friction and wear tester (manufactured by A & D Co., Ltd., product name "AFT-15M-") under the following test conditions. Using A ”), the friction coefficient at the 200th sliding was measured. It can be said that the smaller the value of the friction coefficient is, the more excellent the metalworkability is in the lubricating oil composition.
(Test condition)
-Spherical material: SUJ2, diameter 1/2 inch-Sliding material: A1050 No surface treatment-Temperature: 35 ° C
・ Load: 3kgf
・ Sliding speed: 20 mm / s
・ Sliding distance: 40 mm
・ Sample oil amount: Apply abundantly

(2) Evaluation of dryness: Drying test 3 g of the lubricating oil composition prepared in Examples and Comparative Examples was collected in a glass petri dish having a diameter of 51 mm whose mass was measured in advance, and the temperature was 130 ° C. without covering the glass petri dish. The residual mass of the lubricating oil composition was measured after 45 minutes and 60 minutes in a constant temperature bath (manufactured by TABAI, product name "SAFETY OVEN SPH-200", and the residual ratio (%) was calculated from the following formula. ..
[Residual rate (%) after 45 minutes or 60 minutes] = ([Residual mass (g) of lubricating oil composition after 45 minutes or 60 minutes] / [Mass of lubricating oil composition before test (that is, that is) 3g)]) x 100

From Tables 1 to 3, the lubricating oil compositions prepared in Examples 1 to 28 have a lower coefficient of friction and are excellent in metal workability as compared with the lubricating oil compositions prepared in Comparative Examples 1 and 2. became.

Claims (16)

It contains a base oil (A), N-acylsarcosine (B), and an α-olefin (C) having 10 to 14 carbon atoms.
A lubricating oil composition in which the content of the α-olefin (C) is 10 to 20% by mass based on the total amount of the lubricating oil composition. The lubricating oil composition according to claim 1, wherein the α-olefin (C) has 12 to 14 carbon atoms. The lubricating oil composition according to claim 1 or 2, wherein the content of the α-olefin (C) is 11 to 18% by mass based on the total amount of the lubricating oil composition. The lubricating oil composition according to any one of claims 1 to 3, wherein the base oil (A) contains a synthetic oil. The lubricating oil composition according to any one of claims 1 to 4, wherein the base oil (A) contains a paraffinic synthetic oil. The lubricating oil composition according to any one of claims 1 to 5 , wherein the content of the component (B) is 0.001 to 9% by mass based on the total amount of the lubricating oil composition. The lubricating oil composition according to any one of claims 1 to 6 , wherein the content ratio of the component (B) to 100 parts by mass of the component (C) is 0.030 to 60 parts by mass. The lubricating oil composition according to any one of claims 1 to 7, wherein the content ratio of the component (B) to 100 parts by mass of the component (C) is 30 parts by mass or less. The lubrication according to any one of claims 1 to 8 , further comprising one or more oily agents (D) selected from glycerin derivatives, monohydric alcohols, amines, fatty acids, and fatty acid esters. Oil composition. The lubricating oil composition according to claim 9 , wherein the content ratio of the component (D) to 100 parts by mass of the component (B) is 500 parts by mass or less. The lubricating oil composition according to claim 9 or 10 , wherein the content ratio of the component (D) to 100 parts by mass of the component (C) is 30 parts by mass or less. The lubricating oil composition according to any one of claims 9 to 11, wherein the glycerin derivative contains a compound represented by the following general formula (d-1).

However, in the 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, and z1 represents 1. The lubricating oil composition according to any one of claims 1 to 12 , further containing an antioxidant (E). The lubricating oil composition according to any one of claims 1 to 13 , which is used for metal processing. The lubricating oil composition according to any one of claims 1 to 14 , which is used for metal processing of an aluminum material or an aluminum alloy material. A metal processing method for performing metal processing using the lubricating oil composition according to any one of claims 1 to 15.