JP5283529B2 - Lubricating oil composition for aluminum processing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal working oil composition capable of attaining high-level working performance without using a chlorine-based extreme-pressure agent. <P>SOLUTION: An aluminum working lubricant oil composition includes a hydrocarbon oil and 16 to 99 mass% of a 2-27C alcoholic compound having 1 to 8 hydroxyl groups based on the total amount of the composition. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a lubricating oil composition for aluminum processing which is used for processing of aluminum and a metal containing aluminum as a main component (cutting, grinding, plasticity, drawing, ironing, drawing, extrusion and rolling).

Conventionally, in processing such as aluminum cutting, esters have been used to reduce friction and wear during processing. Esters are used not only as additives because they have high lubricity and stability, but also as base oils that occupy most of the oils (see, for example, Patent Document 1).
However, it became clear that the performance of conventional oil-based oils is limited because the amount of heat generated in the processed part has increased due to strict processing conditions to improve productivity. Therefore, in order to further improve productivity, there is a demand for a higher-performance processing oil, and its development is an urgent task.

JP 2006-249370 A

  The present invention has been made in view of such circumstances, and a lubricating oil composition for aluminum processing capable of achieving a high level of processing performance in processing of aluminum and a metal mainly composed of aluminum. The purpose is to provide.

  As a result of intensive studies to achieve the above object, the present inventors have solved the above problem by using a lubricating oil composition for aluminum processing containing a specific amount of an alcohol compound having a specific structure as a hydrocarbon oil. As a result, the present invention has been completed.

That is, the present invention relates to an aluminum containing a branched monohydric alcohol having 3 to 18 carbon atoms in mineral oil and / or poly α-olefin or a hydride thereof in an amount of 16% by mass or more and 50 % by mass or less based on the total amount of the composition. Further , the present invention relates to a lubricating oil composition for cutting / grinding a metal mainly composed of aluminum .

  Since the lubricating oil composition for aluminum processing of the present invention can sufficiently improve the processing performance of aluminum, it is possible to achieve a high level of well-balanced improvement in processing efficiency, tool life and handling. It becomes possible.

  The present invention will be described below.

  Mineral oil or synthetic oil is used as the hydrocarbon oil that is the base oil component of the lubricating oil composition for aluminum processing of the present invention. These may be a mixture.

  As mineral oil, for example, a lubricating oil fraction obtained by subjecting crude oil to atmospheric distillation and vacuum distillation is subjected to solvent removal, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, catalytic dewaxing, hydrogenation. Examples thereof include paraffinic mineral oil or naphthenic mineral oil that is refined by appropriately combining one or more purification treatments such as purification, sulfuric acid washing, and clay treatment.

  Synthetic oils include, for example, propylene oligomer, polybutene, polyisobutylene, 1-octene oligomer, 1-decene oligomer, ethylene and propylene co-oligomer, ethylene and 1-octene co-oligomer, and ethylene and 1-decene. Polyalpha-olefins such as co-oligomers or their hydrides; isoparaffins; alkylbenzenes such as monoalkylbenzenes, dialkylbenzenes and polyalkylbenzenes; alkylnaphthalenes such as monoalkylnaphthalenes, dialkylnaphthalenes and polyalkylnaphthalenes, etc. Species can be used alone or in combination of two or more.

  The alcohol compound used as the base oil component of the lubricating oil composition for aluminum processing of the present invention has 1 to 8 hydroxyl groups and has 2 to 27 carbon atoms (hereinafter referred to as the alcohol compound according to the present invention). ).

  Of the alcohol compounds according to the present invention, the monohydric alcohol is preferably a linear or branched alcohol having 3 to 18 carbon atoms, or a cycloalkyl alcohol or alkylcycloalkyl alcohol having 5 to 10 carbon atoms. It is done. Specifically, linear or branched propanol (n-propanol, 1-methylethanol, etc.), linear or branched butanol (n-butanol, 1-methylpropanol, 2-methylpropanol, etc.) ), Linear or branched pentanol (n-pentanol, 1-methylbutanol, 2-methylbutanol, 3-methylbutanol, etc.), linear or branched hexanol (n-hexanol, 1 -Methylpentanol, 2-methylpentanol, 3-methylpentanol, etc.), linear or branched heptanol (n-heptanol, 1-methylhexanol, 2-methylhexanol, 3-methylhexanol, 4- Methyl hexanol, 5-methyl hexanol, 2,4-dimethyl pentanol, etc.), linear or branched Butanol (n-octanol, 2-ethylhexanol, 1-methylheptanol, 2-methylheptanol, etc.), linear or branched nonanol (n-nonanol, 1-methyloctanol, 3,5,5- Trimethylhexanol, 1- (2′-methylpropyl) -3-methylbutanol, etc.), linear or branched decanol (n-decanol, iso-decanol, etc.), linear or branched undecanol ( n-undecanol, etc.), linear or branched dodecanol (n-dodecanol, iso-dodecanol, etc.), linear or branched tridecanol, linear or branched tetradecanol (n- Tetradecanol, iso-tetradecanol, etc.), linear or branched pentadecanol, linear or branched Xadecanol (n-hexadecanol, iso-hexadecanol, etc.), linear or branched heptadecanol, linear or branched octadecanol (n-octadecanol, iso-octadecanol) And the like), cyclopentanol, cyclohexanol, methylcyclohexanol, dimethylcyclohexanol, cycloheptanol and the like.

  Of the alcohol compounds according to the present invention, a polyhydric alcohol having 2 to 8 hydroxyl groups is used as the polyhydric alcohol.

  Specific examples of the dihydric alcohol (diol) include ethylene glycol, 1,2-propanediol (propylene glycol), 1,3-propanediol, 1,4-butanediol, 1,2-butanediol, 2-methyl-1,2-propanediol, 2-methyl-1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,2-pentanediol, 1,3-pentanediol, 1 , 4-pentanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 2-ethyl-2-methyl-1,3-propanediol, 1,7-heptanediol, 2-methyl- 2-propyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, 1,8-octanedi Lumpur, 1,9-nonanediol, 1,10-decanediol, 1,11-decanediol, 1,12-dodecane diol.

  Specific examples of trihydric or higher alcohols include trimethylolethane, trimethylolpropane, trimethylolbutane, di- (trimethylolpropane), tri- (trimethylolpropane), pentaerythritol, di- ( Pentaerythritol), tri- (pentaerythritol), glycerol, polyglycerol (2 to 20 mer of glycerol), 1,3,5-pentanetriol, sorbitol, sorbitan, sorbitol glycerol condensate, adonitol, arabitol, xylitol, mannitol Polyhydric alcohol such as xylose, arabinose, ribose, rhamnose, glucose, fructose, galactose, mannose, sorbose, cellobiose, maltose, isomaltose, trehalose, shuku Over scan, raffinose, gentianose, sugars such as melezitose, and their partially etherified products and methyl glucosides, (glycoside) and the like. Among these, neopentyl glycol, trimethylol ethane, trimethylol propane, trimethylol butane, di- (trimethylol propane), tri- (trimethylol propane), pentaerythritol, di- (pentaerythritol), tri- (penta Hindered alcohols such as erythritol are preferred.

  In addition, when using a polyhydric alcohol, what is called a partial ester by which a part of hydroxyl group was esterified may be sufficient.

As the alcohol compound according to the present invention, a saturated monohydric alcohol having a branched chain is particularly preferably used from the viewpoint of workability of aluminum.
Two or more kinds of the alcohol compounds according to the present invention can be mixed and used.

  The content of the alcohol compound according to the present invention is required to be 16% by mass or more, preferably 20% by mass or more, more preferably from the viewpoint of improvement in processing efficiency and tool life, based on the total amount of the composition. It is 25% by mass or more. In addition, the content of the alcohol compound needs to be 99% by mass or less, preferably 80% by mass or less, more preferably 50% by mass or less, based on the total amount of the composition.

  The lubricating oil composition for aluminum processing of the present invention contains the above-described hydrocarbon oil and alcohol compound, but other base oils conventionally known as lubricating base oils are used to such an extent that the performance is not significantly reduced. Can be used. Examples of other base oils include esters (diesters, triesters, polyol esters, etc.), polyoxyalkylene glycols, polyphenyl ethers, and the like. The content in the case of using these base oils is not particularly limited, but is preferably 65% by mass or less, more preferably 50% by mass or less, and 30% by mass or less based on the total amount of the composition. More preferably, it is more preferably 20% by mass or less, and particularly preferably 10% by mass or less.

  The lubricating oil composition for aluminum processing of the present invention preferably contains an oily agent from the viewpoint of improving processing efficiency and tool life. As the oily agent, (A) alcohol other than the alcohol compound according to the present invention, (B) carboxylic acid, (C) sulfide of unsaturated carboxylic acid, (D) compound represented by the following general formula (1), (E) A compound represented by the following general formula (2), (F) a polyoxyalkylene compound, (G) an ester, (H) a hydrocarbyl ether of a polyhydric alcohol, (I) an amine and the like.

[In Formula (1), ^{R 1} represents a hydrocarbon group having 1 to 30 carbon atoms, a represents an integer of 1 to 6, b is an integer of 0-5. ]

[In formula (2), ^{R 2} represents a hydrocarbon group having 1 to 30 carbon atoms, c is an integer of 1 to 6, d is an integer of 0-5. ]

  (A) The alcohol as the oily agent includes monohydric alcohols and polyhydric alcohols other than the alcohol compound according to the present invention.

  (B) The carboxylic acid may be a monobasic acid or a polybasic acid. A monovalent carboxylic acid having 1 to 40 carbon atoms is preferable, a carboxylic acid having 5 to 25 carbon atoms is more preferable, and a carbon number having 5 to 20 carbon atoms is most preferable because higher processing efficiency and tool life can be obtained. Carboxylic acid. These carboxylic acids may be linear or branched and may be saturated or unsaturated, but are preferably saturated carboxylic acids from the standpoint of stickiness prevention.

  Specifically, as the monobasic acid, a fatty acid having 2 to 24 carbon atoms is usually used, and the fatty acid may be linear or branched, and may be saturated or unsaturated. Specifically, for example, acetic acid, propionic acid, linear or branched butanoic acid, linear or branched pentanoic acid, linear or branched hexanoic acid, linear or branched heptane Acid, linear or branched octanoic acid, linear or branched nonanoic acid, linear or branched decanoic acid, linear or branched undecanoic acid, linear or branched dodecane Acid, linear or branched tridecanoic acid, linear or branched tetradecanoic acid, linear or branched pentadecanoic acid, linear or branched hexadecanoic acid, linear or branched heptadecane Acid, linear or branched octadecanoic acid, linear or branched nonadecanoic acid, linear or branched icosanoic acid, linear or branched henicosanoic acid, linear or branched docosanoic acid Straight chain or branched tricosanoic acid, straight Or branched saturated fatty acids such as tetracosanoic acid, acrylic acid, linear or branched butenoic acid, linear or branched pentenoic acid, linear or branched hexenoic acid, linear or branched Heptenoic acid, linear or branched octenoic acid, linear or branched nonenoic acid, linear or branched decenoic acid, linear or branched undecenoic acid, linear or branched Dodecenoic acid, linear or branched tridecenoic acid, linear or branched tetradecenoic acid, linear or branched pentadecenoic acid, linear or branched hexadecenoic acid, linear or branched Heptadecenoic acid, linear or branched octadecenoic acid, linear or branched nonadecenoic acid, linear or branched icosenoic acid, linear or branched henicosenic acid, linear or branched Docosenoic acid, linear or branched Of tricosenoic acid, unsaturated fatty acids such as straight-chain or branched tetracosenoic acid, and mixtures thereof. Among these, from the viewpoint of improvement in processing efficiency and tool life, and handleability, a saturated fatty acid having 3 to 20 carbon atoms, an unsaturated fatty acid having 3 to 22 carbon atoms, and a mixture thereof are particularly preferable, and those having 4 to 18 carbon atoms. Saturated fatty acids, unsaturated fatty acids having 4 to 18 carbon atoms and mixtures thereof are more preferred, unsaturated fatty acids having 4 to 18 carbon atoms are more preferred, and saturated fatty acids having 4 to 18 carbon atoms are further preferred from the viewpoint of anti-stickiness. preferable.

  Examples of the polybasic acid include dibasic acids having 2 to 16 carbon atoms and trimellitic acid. The dibasic acid having 2 to 16 carbon atoms may be linear or branched, and may be saturated or unsaturated. Specifically, for example, ethanedioic acid, propanedioic acid, linear or branched butanedioic acid, linear or branched pentanedioic acid, linear or branched hexanedioic acid, linear Or branched heptanedioic acid, linear or branched octanedioic acid, linear or branched nonanedioic acid, linear or branched decanedioic acid, linear or branched undecanedioic acid Acid, linear or branched dodecanedioic acid, linear or branched tridecanedioic acid, linear or branched tetradecanedioic acid, linear or branched heptadecanedioic acid, linear or Branched hexadecanedioic acid, linear or branched hexenedioic acid, linear or branched heptenedioic acid, linear or branched octenedioic acid, linear or branched nonenedioic acid , Linear or branched decenedioic acid, linear or branched undecenedioic acid, linear Is branched dodecenedioic acid, linear or branched tridecenedioic acid, linear or branched tetradecenedioic acid, linear or branched heptadecenedioic acid, linear or branched hexadecene diacid Examples thereof include acids and mixtures thereof.

  (C) As a sulfide of unsaturated carboxylic acid, the sulfide of unsaturated thing among the carboxylic acids of said (B) can be mentioned, for example. Preferably, a sulfide of oleic acid can be used.

(D) In the compound represented by the general formula (1), the hydrocarbon group having 1 to 30 carbon atoms represented by R ¹ is, for example, a linear or branched alkyl group having 1 to 30 carbon atoms, A cycloalkyl group having 5 to 7 carbon atoms, an alkylcycloalkyl group having 6 to 30 carbon atoms, a linear or branched alkenyl group having 2 to 30 carbon atoms, an aryl group having 6 to 10 carbon atoms, and a 7 to 30 carbon atom Examples thereof include an alkylaryl group and an arylalkyl group having 7 to 30 carbon atoms. In these, it is preferable that it is a C1-C30 linear or branched alkyl group, More preferably, it is a C1-C20 linear or branched alkyl group, More preferably, it is C1-C1. 10 linear or branched alkyl groups, and most preferably a linear or branched alkyl group having 1 to 4 carbon atoms. Examples of the linear or branched alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, a linear or branched propyl group, and a linear or branched butyl group.

  The substitution position of the hydroxyl group is arbitrary, but when it has two or more hydroxyl groups, it is preferably substituted with an adjacent carbon atom. a is preferably an integer of 1 to 3, and more preferably 2. b is preferably an integer of 0 to 3, more preferably 1 or 2. Examples of the compound represented by the general formula (1) include p-tert-butylcatechol.

(E) In the compound represented by the general formula (2), examples of the hydrocarbon group having 1 to 30 carbon atoms represented by R ² are represented by R ¹ in the general formula (1). The same thing as the example of a C1-C30 hydrocarbon group can be mentioned, and the example of a preferable thing is also the same. The substitution position of the hydroxyl group is arbitrary, but when it has two or more hydroxyl groups, it is preferably substituted with an adjacent carbon atom. c is preferably an integer of 1 to 3, and more preferably 2. d is preferably an integer of 0 to 3, more preferably 1 or 2. Examples of the compound represented by the general formula (2) include 2,2-dihydroxynaphthalene and 2,3-dihydroxynaphthalene.

  (F) As a polyoxyalkylene compound, the compound represented, for example by the following general formula (3) or (4) can be mentioned.

_{^{R 3 O- (R 4 O)}} e -R 5 (3)
[In Formula (3), R ³ and R ⁵ each independently represents a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms, R ⁴ represents an alkylene group having 2 to ⁴ carbon atoms, and e is a number average. It represents an integer having a molecular weight of 100 to 3500. ]

^{A - [(R 6 O)} f -R 7] g (4)
Wherein (4), A represents the residue obtained by removing some or all of the hydrogen atoms of the hydroxyl groups of a polyhydric alcohol having 3-8 hydroxyl groups, R ⁶ represents an alkylene group having 2 to 4 carbon atoms , R ⁷ represents a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms, f represents an integer having a number average molecular weight of 100 to 3500, g represents the number of hydrogen atoms removed from the hydroxyl group of A, and Represents the same number. ]

In the general formula (3), at least one of R ³ and R ⁵ is preferably a hydrogen atom. Examples of the hydrocarbon group having 1 to 30 carbon atoms represented by R ³ and R ^5, for example, the same as the examples of the hydrocarbon group having 1 to 30 carbon atoms represented by R ¹ in the general formula (1) Examples of preferred ones are also the same. Specific examples of the alkylene group having 2 to 4 carbon atoms represented by R ⁴ include an ethylene group, a propylene group (methylethylene group), and a butylene group (ethylethylene group). e is preferably an integer such that the number average molecular weight is 300 to 2,000, and more preferably an integer such that the number average molecular weight is 500 to 1,500.

In the general formula (4), specific examples of the polyhydric alcohol having 3 to 8 hydroxyl groups constituting A are the same as those of the alcohol compound according to the present invention.
Examples of the alkylene group having 2 to 4 carbon atoms represented by R ⁶ may be the same as the examples of the alkylene group having 2 to 4 carbon atoms represented by R ⁴ in the general formula (3) . As examples of the hydrocarbon group having 1 to 30 carbon atoms represented by R ⁷ are given the same as examples of the hydrocarbon group having 1 to 30 carbon atoms represented by R ¹ in the general formula (1) Examples of preferred ones are the same. At least one of g R ⁷ is preferably a hydrogen atom, more preferably all hydrogen atoms. f is preferably an integer such that the number average molecular weight is 300 to 2,000, more preferably an integer such that the number average molecular weight is 500 to 1,500.

  (G) As ester, the alcohol which comprises this may be monohydric alcohol or polyhydric alcohol, and carboxylic acid may be monobasic acid or polybasic acid. The monohydric alcohol is preferably the same as the monohydric alcohol of the alcohol compound according to the present invention. The polyhydric alcohol is preferably the same as the polyhydric alcohol of the alcohol compound according to the present invention.

As described above, the alcohol constituting the ester may be a monohydric alcohol or a polyhydric alcohol. However, it is possible to achieve better processing efficiency and tool life, and a low pour point. A polyhydric alcohol is preferable because it is easier to obtain and handling properties in winter and cold regions are improved. Further, when an ester of polyhydric alcohol is used, in the cutting / grinding process, the accuracy of the finished surface of the workpiece is improved and the effect of preventing wear of the tool edge is further increased.
Moreover, as an acid which comprises ester, the monobasic acid and polybasic acid as (B) carboxylic acid shown as said oil-based agent are mentioned.

  When a polyhydric alcohol is used as the alcohol component, it may be a complete ester in which all the hydroxyl groups in the polyhydric alcohol are esterified, or a partial ester in which some of the hydroxyl groups are not esterified and remain as hydroxyl groups. Good. Further, when a polybasic acid is used as the carboxylic acid component, it may be a complete ester in which all the carboxyl groups in the polybasic acid are esterified, or a part of the carboxyl group is not esterified and remains as a carboxyl group. It may be a partial ester.

  Although the total carbon number of the ester is not particularly limited, an ester having a total carbon number of 7 or more is preferable, an ester of 9 or more is more preferable, and an ester of 11 or more is most preferable from the viewpoint of improvement in processing efficiency and tool life. . Further, from the viewpoint of not increasing the occurrence of stain and corrosion, and compatibility with organic materials, an ester having a total carbon number of 60 or less is preferred, an ester of 45 or less is more preferred, an ester of 26 or less is more preferred, 24 or less esters are more preferred, and 22 or less esters are most preferred.

(H) The polyhydric alcohol constituting the hydrocarbyl ether of the polyhydric alcohol is preferably the same as the polyhydric alcohol of the alcohol compound according to the present invention.
Among these polyhydric alcohols, ethylene glycol, diethylene glycol, polyethylene glycol (ethylene glycol 3-10 mer), propylene glycol, dipropylene glycol, polypropylene glycol (propylene glycol 3-10 mer), 1,3- Propanediol, 2-methyl-1,2-propanediol, 2-methyl-1,3-propanediol, neopentyl glycol, glycerin, diglycerin, triglycerin, trimethylolalkane (trimethylolethane, trimethylolpropane, trimethylol Methylol butane and the like, and dimers and tetramers thereof, pentaerythritol, dipentaerythritol, 1,2,4-butanetriol, 1,3,5-pentanetriol, 1,2,6-hexanetriol , 1,2,3,4 butane tetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol, xylitol, divalent to hexavalent polyhydric alcohols and mixtures thereof, such as mannitol and the like are preferable. Even more preferred are ethylene glycol, propylene glycol, neopentyl glycol, glycerin, trimethylol ethane, trimethylol propane, pentaerythritol, sorbitan, and mixtures thereof. Among these, glycerin is most preferable from the viewpoint of improving the processing efficiency and the tool life.

  Examples of the hydrocarbyl ether of (H) polyhydric alcohol include those obtained by converting part or all of the hydroxyl groups of the polyhydric alcohol into hydrocarbyl ether. From the viewpoint of improving processing efficiency and tool life, a product obtained by hydrocarbyl etherifying a part of hydroxyl groups of a polyhydric alcohol (partially etherified product) is preferable. Here, the hydrocarbyl group is an alkyl group having 1 to 24 carbon atoms, an alkenyl group having 2 to 24 carbon atoms, a cycloalkyl group having 5 to 7 carbon atoms, an alkylcycloalkyl group having 6 to 11 carbon atoms, carbon A hydrocarbon group having 1 to 24 carbon atoms such as an aryl group having 6 to 10 carbon atoms, an alkylaryl group having 7 to 18 carbon atoms, and an arylalkyl group having 7 to 18 carbon atoms is represented.

  Among these, from the viewpoint of improvement in machining efficiency and tool life, a linear or branched alkyl group having 2 to 18 carbon atoms and a linear or branched alkenyl group having 2 to 18 carbon atoms are preferable, and the number of carbon atoms 3-12 linear or branched alkyl groups and oleyl groups (residues obtained by removing hydroxyl groups from oleyl alcohol) are more preferred.

  (I) Monoamine is preferably used as the amine. The carbon number of the monoamine is preferably 6 to 24, more preferably 12 to 24. The carbon number here means the total number of carbon atoms contained in the monoamine. When the monoamine has two or more hydrocarbon groups, it represents the total number of carbon atoms.

  As the monoamine used in the present invention, any of a primary monoamine, a secondary monoamine, and a tertiary monoamine can be used, but a primary monoamine is preferable from the viewpoint of improving the processing efficiency and tool life.

  As the hydrocarbon group bonded to the nitrogen atom of the monoamine, any of an alkyl group, alkenyl group, cycloalkyl group, alkylcycloalkyl group, aryl group, alkylaryl group, arylalkyl group, etc. can be used. From the viewpoint of improving efficiency and tool life, an alkyl group or an alkenyl group is preferable. The alkyl group and alkenyl group may be either linear or branched, but are preferably linear from the viewpoint of improving processing efficiency and tool life.

  Preferable monoamines used in the present invention include, for example, hexylamine (including all isomers), heptylamine (including all isomers), octylamine (including all isomers), nonylamine (all ), Decylamine (including all isomers), undecylamine (including all isomers), dodecylamine (including all isomers), tridecylamine (including all isomers) ), Tetradecylamine (including all isomers), pentadecylamine (including all isomers), hexadecylamine (including all isomers), heptadecylamine (including all isomers), Octadecylamine (including all isomers), nonadecylamine (including all isomers), icosylamine (including all isomers), heicosylamine (Including all isomers), docosylamine (including all isomers), tricosylamine (including all isomers), tetracosylamine (including all isomers), octadecenylamine (all (Including isomers) (including oleylamine and the like) and mixtures of two or more thereof. Among these, from the viewpoint of improvement in machining efficiency and tool life, primary monoamines having 12 to 24 carbon atoms are preferable, primary monoamines having 14 to 20 carbon atoms are more preferable, and primary monoamines having 16 to 18 carbon atoms are preferable. Grade monoamines are more preferred.

  In this invention, only 1 type chosen from the said oil-based agent (A)-(I) may be used, and 2 or more types of mixtures may be used. Among these, it is preferable that it is 1 type, or 2 or more types of mixtures chosen from (B) carboxylic acid and (I) amine from the point of an improvement of work efficiency and tool life.

  The content of the oily agent is not particularly limited, but is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, more preferably 0.05% by mass or more, based on the total amount of the composition, from the viewpoint of improvement in processing efficiency and tool life. Preferably it is 0.1 mass% or more. From the viewpoint of stability, the content of the oily agent is preferably 15% by mass or less, more preferably 10% by mass or less, and further preferably 5% by mass or less, based on the total amount of the composition.

  Moreover, it is preferable that the lubricating oil composition for aluminum processing of this invention further contains an extreme pressure agent. Preferred extreme pressure agents include sulfur compounds and phosphorus compounds.

  The sulfur compound is not particularly limited as long as the properties of the lubricating oil composition for aluminum processing are not impaired, but dihydrocarbyl polysulfide, sulfide ester, sulfide mineral oil, zinc dithiophosphate, zinc dithiocarbamate, molybdenum dithiophosphate And molybdenum dithiocarbamate are preferably used.

The dihydrocarbyl polysulfide is a sulfur compound generally called polysulfide or sulfurized olefin, and specifically means a compound represented by the following general formula (5).
_{^{R 8 -S h -R 9 (5}} )
[In Formula (5), R ⁸ and R ⁹ may be the same or different, and each has a linear or branched alkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or a carbon number. It represents a 7-20 alkylaryl group or a C7-20 arylalkyl group, and h represents an integer of 2-6, preferably 2-5. ]

R ⁸ and R ⁹ in the general formula (5) are each a branched alkyl group having 3 to 18 carbon atoms derived from ethylene or propylene, from the viewpoint of improving the processing efficiency and tool life. More preferred is a branched alkyl group having 6 to 15 carbon atoms derived from ethylene or propylene.

  Specific examples of the sulfurized ester include animal and vegetable fats and oils such as beef tallow, pork tallow, fish fat, rapeseed oil, and soybean oil; ) And various alcohols, and unsaturated fatty acid esters obtained by reacting them with alcohols; and those obtained by sulfiding a mixture thereof by any method.

  Sulfided mineral oil refers to one obtained by dissolving elemental sulfur in mineral oil. Here, the mineral oil is not particularly limited, and specifically, a lubricating oil fraction obtained by subjecting crude oil to atmospheric distillation and vacuum distillation is subjected to solvent removal, solvent extraction, hydrocracking, solvent dewaxing, Examples thereof include paraffinic mineral oils and naphthenic mineral oils that are refined by appropriately combining one or more purification treatments such as catalytic dewaxing, hydrorefining, sulfuric acid washing, and clay treatment. In addition, as the elemental sulfur, any form such as a lump, powder, molten liquid, etc. may be used, but when powdered or molten liquid elemental sulfur is used, it is efficiently dissolved in the base oil. Is preferable. In addition, molten liquid elemental sulfur has the advantage that the melting operation can be performed in a very short time because the liquids are mixed together, but it must be handled above the melting point of elemental sulfur, heating equipment, etc. It is not always easy to handle because it requires special equipment and is handled in a high temperature atmosphere. On the other hand, powdery simple sulfur is particularly preferable because it is inexpensive and easy to handle, and the time required for dissolution is sufficiently short. Moreover, although there is no restriction | limiting in particular in sulfur content in a sulfide mineral oil, Preferably it is 0.05-1.0 mass% normally on the basis of the sulfide mineral oil whole quantity, More preferably, it is 0.1-0.5 mass%. is there.

  The zinc dithiophosphate compound, the zinc dithiocarbamate compound, the molybdenum dithiophosphate and the molybdenum dithiocarbamate mean compounds represented by the following general formulas (6) to (9), respectively.

In the formulas (6) to (9), R ¹⁰ , R ¹¹ , R ¹² , R ¹³ , R ¹⁴ , R ¹⁵ , R ¹⁶ , R ¹⁷ , R ¹⁸ , R ¹⁹ , R ²⁰ , R ²¹ , R ²² , R ²³ , R ²⁴ and R ²⁵ may be the same or different and each represents a hydrocarbon group having 1 or more carbon atoms, X ¹ and X ² each represents an oxygen atom or a sulfur atom, and each X ¹ and each X ² May be the same or different.

  In the present invention, among the above sulfur compounds, it is preferable to use at least one selected from the group consisting of dihydrocarbyl polysulfide and sulfurized ester because the effect of improving the working efficiency and tool life can be obtained at a higher level.

  Although the content of the sulfur compound is arbitrary, it is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and still more preferably from the viewpoint of improvement in processing efficiency and tool life, based on the total amount of the composition. Is 0.1% by mass or more. From the viewpoint of preventing abnormal wear, the content of the sulfur compound is preferably 50% by mass or less, more preferably 40% by mass or less, still more preferably 30% by mass or less, and particularly preferably 20% based on the total amount of the composition. It is below mass%.

  Specific examples of phosphorus compounds used as extreme pressure agents in the present invention include phosphoric acid esters, acidic phosphoric acid esters, amine salts of acidic phosphoric acid esters, chlorinated phosphoric acid esters, phosphorous acid esters, and phosphors. Examples include thionate. Examples of these phosphorus compounds include esters of phosphoric acid, phosphorous acid or thiophosphoric acid and alkanols, polyether type alcohols, or derivatives thereof.

  In the present invention, among the above phosphorus compounds, higher processing efficiency and tool life improvement effect can be obtained, and therefore, phosphate esters, acidic phosphate esters, and amine salts of acidic phosphate esters are preferable.

  Further, as described later, the lubricating oil composition for aluminum processing of the present invention can be applied to uses other than the lubricating oil processing for aluminum processing, but the lubricating oil composition for aluminum processing of the present invention is applied to a machine tool slide. When using as oil for moving surfaces, it is preferable to contain acidic phosphate ester and amine salt of acidic phosphate ester. Moreover, when using the lubricating oil composition for aluminum processing of this invention as a hydraulic fluid, it is preferable to contain phosphate ester. Furthermore, when used as a dual-use oil for sliding surface oil and hydraulic fluid, use at least one selected from acidic phosphate esters and amine salts of acidic phosphate esters in combination with phosphate esters. Is preferred.

  The lubricating oil composition for aluminum processing of the present invention may contain only one of a sulfur compound and a phosphorus compound as an extreme pressure agent, or may contain both a sulfur compound and a phosphorus compound. Good. From the point that the effect of improving the machining efficiency and the tool life is further enhanced, it preferably contains a phosphorus compound, or both a sulfur compound and a phosphorus compound, and more preferably contains both a sulfur compound and a phosphorus compound.

  Although the content of the extreme pressure agent is arbitrary, it is preferably 0.005% by mass or more and 0.01% by mass or more based on the total amount of the composition from the viewpoint of improving the processing efficiency and tool life. Is more preferable, and it is still more preferable that it is 0.05 mass% or more. From the viewpoint of preventing abnormal wear, the content of the extreme pressure agent is preferably 25% by mass or less, more preferably 20% by mass or less, and more preferably 15% by mass or less, based on the total amount of the composition. Even more preferably, it is even more preferably 10% by mass or less, and most preferably 7% by mass or less.

  In the present invention, only one of the above-mentioned oily agent or extreme pressure agent may be used. However, the oily agent and the extreme pressure agent are used in combination from the viewpoint that higher processing efficiency and an improvement effect of the tool life can be achieved. Is preferred.

  Moreover, in the lubricating oil composition for aluminum processing of this invention, it is preferable to contain organic acid salt from the point from which the more outstanding processing efficiency and tool life are obtained. As the organic acid salt, sulfonate, phenate, salicylate, and a mixture thereof are preferably used. The positive components of these organic acid salts include alkali metals such as sodium and potassium; alkaline earth metals such as magnesium, calcium and barium; ammonia and alkylamines having 1 to 3 carbon atoms (monomethylamine, dimethyl). Amines, trimethylamines, monoethylamines, diethylamines, triethylamines, monopropylamines, dipropylamines, tripropylamines, etc.), alkanolamines having an alkanol group having 1 to 3 carbon atoms (monomethanolamine, dimethanolamine, trimethanolamine, Monoethanolamine, diethanolamine, triethanolamine, monopropanolamine, dipropanolamine, tripropanolamine etc.) such as amine, zinc, etc. But an alkali metal or alkaline earth metals are preferred, calcium is particularly preferred. When the positive component of the organic acid salt is an alkali metal or alkaline earth metal, higher lubricity tends to be obtained.

  The total base number of the organic acid salt is preferably 50 to 500 mgKOH / g, more preferably 100 to 450 mgKOH / g. When the total base number of the organic acid salt is less than 50 mgKOH / g, the lubricity improving effect due to the addition of the organic acid salt tends to be insufficient. On the other hand, the organic acid salt having a total base number exceeding 500 mgKOH / g is Usually, since manufacture is very difficult and acquisition is difficult, it is unpreferable respectively. The total base number referred to here is JIS K 2501 “Petroleum products and lubricants—Test method for neutralization number”. The total base number [mgKOH / g] by the perchloric acid method measured according to the above.

  Further, the content of the organic acid salt is preferably 0.1 to 30% by mass, more preferably 0.5 to 25% by mass, and further preferably 1 to 20% by mass based on the total amount of the composition. . When the content of the organic acid salt is less than 0.1% by mass, the effect of improving the processing efficiency and tool life due to the addition of the organic acid salt tends to be insufficient. The stability of the composition tends to be reduced and precipitates are likely to occur.

  As the sulfonate, those produced by any method can be used. For example, alkali metal salts, alkaline earth metal salts, amine salts and mixtures of alkyl aromatic sulfonic acids obtained by sulfonating alkyl aromatic compounds having a molecular weight of 100 to 1500, preferably 200 to 700 are used. it can. As the alkyl aromatic sulfonic acid here, generally, a sulfonated alkyl aromatic compound of a lubricating oil fraction of mineral oil, a petroleum sulfonic acid such as so-called mahogany acid, which is by-produced during white oil production, and a detergent Alkylbenzene having a linear or branched alkyl group obtained by by-production from a raw material alkylbenzene production plant or alkylating polyolefin to benzene, or alkylnaphthalene such as dinonylnaphthalene And synthetic sulfonic acids such as those obtained by sulphonation of sulphonate. In addition, the above alkyl aromatic sulfonic acid and an alkali metal base (such as an alkali metal oxide or hydroxide), an alkaline earth metal base (such as an alkaline earth metal oxide or hydroxide), or the above-mentioned So-called neutral (normal salt) sulfonates obtained by reacting with amines (ammonia, alkylamines, alkanolamines, etc.); neutral (normal salt) sulfonates, excess alkali metal bases, alkaline earth metal bases Or so-called basic sulfonates obtained by heating an amine in the presence of water; reacting a neutral (normal salt) sulfonate with an alkali metal base, an alkaline earth metal base or an amine in the presence of carbon dioxide. So called carbonate overbased (superbasic) sulfonates; neutral (normal salt) sulfonates with alkali React with genus bases, alkaline earth metal bases or amines and boric acid compounds such as boric acid or boric anhydride, or carbonate overbased (superbasic) sulfonates with boric acid or boric anhydride And so-called borate overbased (superbasic) sulfonates produced by reacting boric acid compounds; and mixtures thereof.

  Further, as the phenate, specifically, in the presence or absence of elemental sulfur, an alkylphenol having 1 to 2 alkyl groups having 4 to 20 carbon atoms and an alkali metal base (alkali metal oxide or Hydroxides), alkaline earth metal bases (alkaline earth metal oxides, hydroxides, etc.) or neutrals obtained by reacting with the amines mentioned above (ammonia, alkylamines, alkanolamines, etc.). Phenates; neutral phenates and excess alkali metal bases, alkaline earth metal bases or amines obtained by heating in the presence of water, so-called basic phenates; neutral phenates in the presence of carbon dioxide So-called carbonate overbased (superbase) obtained by reacting with metal bases, alkaline earth metal bases or amines ) Phenates; neutral phenates are reacted with alkali metal bases, alkaline earth metal bases or amines and boric acid compounds such as boric acid or boric anhydride, or carbonate overbased (superbasic) phenates And so-called borate overbased (superbasic) phenates produced by reacting boric acid compounds such as boric acid or boric anhydride; and mixtures thereof.

  Further, as the salicylate, specifically, an alkyl salicylic acid having 1 to 2 alkyl groups having 4 to 20 carbon atoms and an alkali metal base (alkali metal oxide) in the presence or absence of elemental sulfur. And hydroxides), alkaline earth metal bases (such as alkaline earth metal oxides and hydroxides) or the above-described amines (such as ammonia, alkylamines and alkanolamines). So-called basic salicylate obtained by heating neutral salicylate and excess alkali metal base, alkaline earth metal base or amine in the presence of water; neutral salicylate in the presence of carbon dioxide gas So-called carbonate overbases obtained by reacting with alkali metal bases, alkaline earth metal bases or amines (Superbasic) salicylates; neutral salicylates react with alkali metal bases, alkaline earth metal bases or amines and boric acid compounds such as boric acid or boric anhydride, or carbonate overbased (superbases) A so-called borate overbased (superbasic) salicylate produced by reacting a metal salicylate with a boric acid compound such as boric acid or anhydrous boric acid; and a mixture thereof.

  In the present invention, the organic acid salt may be used alone, or the organic acid salt and other additives may be used in combination. From the point that machining efficiency and tool life are further improved, it is preferable to use an organic acid salt in combination with the above extreme pressure agent, and it is particularly preferable to use a combination of three types of sulfur compound, phosphorus compound and organic acid salt. .

  Moreover, it is preferable that the lubricating oil composition for aluminum processing of the present invention further contains an antioxidant. By adding an antioxidant, it is possible to prevent stickiness due to alteration of the constituent components, and to improve thermal and oxidation stability.

  Antioxidants that can be used include phenolic antioxidants, amine-based antioxidants, zinc dithiophosphate antioxidants, and those used as food additives.

  As the phenol-based antioxidant, any phenol-based compound used as an antioxidant for lubricating oils can be used, and is not particularly limited. For example, an alkylphenol compound is preferable.

  As the amine-based antioxidant, any amine-based compound used as an antioxidant for lubricating oils can be used, and is not particularly limited. For example, phenyl-α-naphthylamine, Np-alkyl Preferred examples include phenyl-α-naphthylamine and p, p′-dialkyldiphenylamine, and specifically include 4-butyl-4′-octyldiphenylamine, phenyl-α-naphthylamine, octylphenyl-α-naphthylamine, dodecylphenyl. -Α-naphthylamine and mixtures thereof.

  Specific examples of the zinc dithiophosphate antioxidant include zinc dithiophosphate represented by the following general formula (18).

[In the formula (18), R ⁵¹ , R ⁵² , R ⁵³ and R ⁵⁴ may be the same or different and each represents a hydrocarbon group. ]

  Antioxidants used as food additives partially overlap with the above-mentioned phenolic antioxidants. For example, 2,6-di-tert-butyl-p-cresol (DBPC), 4,4 '-Methylenebis (2,6-di-tert-butylphenol), 4,4'-bis (2,6-di-tert-butylphenol), 4,4'-thiobis (6-tert-butyl-o-cresol) , Ascorbic acid (vitamin C), fatty acid ester of ascorbic acid, tocopherol (vitamin E), 3,5-di-tert-butyl-4-hydroxyanisole, 2-tert-butyl-4-hydroxyanisole, 3-tert- Butyl-4-hydroxyanisole, 1,2-dihydro-6-ethoxy-2,2,4-trimethylquinoline (ethoxyquin), 2- (1,1-dimethyl) -1, Examples thereof include 4-benzenediol (TBHQ) and 2,4,5-trihydroxybutyrophenone (THBP).

  Among these antioxidants, those used as phenolic antioxidants, amine antioxidants, and food additives are preferred. Furthermore, when importance is attached to biodegradability, what is used as the said food additive is more preferable, and among them, ascorbic acid (vitamin C), fatty acid ester of ascorbic acid, tocopherol (vitamin E), 2,6- Di-tert-butyl-p-cresol (DBPC), 3,5-di-tert-butyl-4-hydroxyanisole, 2-tert-butyl-4-hydroxyanisole, 3-tert-butyl-4-hydroxyanisole, 1,2-dihydro-6-ethoxy-2,2,4-trimethylquinoline (ethoxyquin), 2- (1,1-dimethyl) -1,4-benzenediol (TBHQ), or 2,4,5-tri Hydroxybutyrophenone (THBP) is preferred, ascorbic acid (vitamin C), fatty acid ester of ascorbic acid, tocopherol (Vitamin E), 2,6-di-tert-butyl-p-cresol (DBPC), or 3,5-di-tert-butyl-4-hydroxyanisole is more preferred.

  The content of the antioxidant is not particularly limited, but in order to maintain good heat / oxidation stability, the content is preferably 0.01% by mass or more based on the total amount of the composition, more preferably 0.05. % By mass or more, most preferably 0.1% by mass or more. On the other hand, since the improvement in the effect cannot be expected even if more are added, the content is preferably 10% by mass or less, more preferably 5% by mass or less, and most preferably 3% by mass or less.

  Further, the lubricating oil composition for aluminum processing of the present invention may contain conventionally known additives other than those described above. Examples of such additives include extreme pressure agents other than the above-described phosphorus compounds and sulfur compounds (including chlorine extreme pressure agents); wetting agents such as diethylene glycol monoalkyl ether; acrylic polymers, paraffin wax, microwax, slack wax Film forming agents such as polyolefin waxes; water displacement agents such as fatty acid amine salts; solid lubricants such as graphite, graphite fluoride, molybdenum disulfide, boron nitride, polyethylene powder; amines, alkanolamines, amides, carboxylic acids, carboxylic acids Corrosion inhibitors such as acid salts, sulfonates, phosphoric acid, phosphates, partial esters of polyhydric alcohols; metal deactivators such as benzotriazoles and thiadiazoles; antifoams such as methylsilicones, fluorosilicones, and polyacrylates Agents: alkenyl succinimide, benzyl amine Emissions, ashless dispersants such as polyalkenyl amines polyaminoamide; and the like. The content when these known additives are used in combination is not particularly limited, but is added in such an amount that the total content of these known additives is 0.1 to 10% by mass based on the total amount of the composition. It is common.

  The lubricating oil composition for aluminum processing of the present invention may contain a chlorine-based additive such as a chlorine-based extreme pressure agent as described above, but from the viewpoint of improving safety and reducing the burden on the environment. Preferably does not contain a chlorine-based additive. The chlorine concentration is preferably 1000 ppm by mass or less, more preferably 500 ppm by mass or less, still more preferably 200 ppm by mass or less, and 100 ppm by mass or less, based on the total amount of the composition. It is particularly preferred.

Although the kinematic viscosity of the lubricating oil composition for aluminum processing of the present invention is not particularly limited, the upper limit value of the kinematic viscosity at 40 ° C. is preferably 200 mm ² / s from the viewpoint of easy supply to the processed part. Preferably it is 100 mm < ² > / s, More preferably, it is 75 mm < ² > / s, Most preferably, it is 50 mm < ² > / s. On the other hand, the lower limit is preferably 1 mm ² / s, more preferably 3 mm ² / s, and most preferably 5 mm ² / s.

  Hereinafter, the present invention will be described more specifically based on Examples and Comparative Examples shown in Table 1, but the present invention is not limited to the following Examples.

[Examples 1 to 4 and Comparative Examples 1 to 5]
It is shown below the base oil a to b, using the alcohol A及 beauty additive A-E, was prepared aluminum processing lubricating oil composition of the sample oils 1 to sample oil 9.

(1) Base oil Base oil a: Mineral oil (kinematic viscosity at 40 ° C. 32 mm ² / s)
Base oil b : poly α-olefin (kinematic viscosity at 40 ° C. 30 mm ² / s)
(2) Alcohol Alcohol A: Branched tridecanol (3) Additive Additive A: Tricresyl phosphate Additive B: Sulfurized ester Additive C: Glycerol monooleate Additive D: Butyl stearate Additive E: Oleic acid (4) Sample oil Sample oil 1: Base oil a (75% by mass), alcohol A (25% by mass)
Sample oil 2 : base oil a (73% by mass), alcohol A (25% by mass), additive A (1% by mass), additive B (1% by mass)
Sample oil 3 : base oil b (75% by mass), alcohol A (25% by mass)
Sample oil 4 : base oil a (84% by mass), alcohol A (16% by mass)
Sample oil 5 : base oil a (90% by mass), alcohol A (10% by mass)
Sample oil 6 : base oil a (75% by mass), additive C (25% by mass)
Sample oil 7 : base oil a (73% by mass), additive D (25% by mass), additive A (1% by mass), additive B (1% by mass)
Sample oil 8 : base oil a (2% by mass), additive D (98% by mass)
Sample oil 9 : base oil a (75% by mass), additive E (25% by mass)

Next, the following evaluation tests were carried out using the lubricating oil compositions for aluminum processing of Examples 1 to 4 and Comparative Examples 1 to 5.

(Tapping test)
Regarding the oil processing compositions for aluminum processing of Examples 1 to 4 and Comparative Examples 1 to 5, processing performance was evaluated using diisodecyl adipate as a comparative standard oil. Specifically, a tapping test was performed under the conditions shown below by alternately using the metalworking fluid compositions of Examples 1 to 4 or Comparative Examples 1 to 5 and diisodecyl adipate. When supplying the aluminum processing oil composition to the processing site, the aluminum processing oil composition was sprayed directly onto the processing site under the condition of 6 L / hr.

-Work material: AC8A
・ Tool diameter: 8mm
・ Tap pitch: 1.25mm
-Tap rake angle: 1.5 degrees-Tap biting angle: 10 degrees-Tap pilot hole diameter: 7.4 mm
・ Rotation speed: 360rpm
Standard oil: DIDA (diisodecyl adipate)
-Supply oil amount: 10ml

The tapping energy in the above test was measured, and the tapping energy efficiency (%) was calculated using the following formula.
Tapping energy efficiency (%) = (tapping energy when using comparative standard oil) / (tapping energy when using metalworking oil composition)
The obtained results are shown in Table 1. In the table, the higher the value of tapping energy efficiency, the higher the lubricity.

(Abrasion resistance evaluation test)
In order to evaluate the performance against tool wear, the tapping energy efficiency with respect to the standard oil after machining 10 holes and 150 holes under the following conditions for the lubricating oil compositions for working examples 1 to 4 and comparative examples 1 to 5 Was measured, and the reduction rate of the value after 150 holes with respect to 10 holes was determined. The degree of decrease in tapping energy efficiency with the number of machining was judged to be due to tool wear. In addition, the test was performed by removing aluminum adhering to the tool every 10 holes with a 10% sodium hydroxide solution.
-Work material: AC8A
・ Tool diameter: 8mm
・ Tap pitch: 1.25mm
-Tap rake angle: 1.5 degrees-Tap biting angle: 10 degrees-Tap pilot hole diameter: 7.4 mm
・ Rotation speed: 360rpm
・ Number of processing: 10, 150 holes ・ Standard oil: DIDA (diisodecyl adipate)
-Supply oil amount: 10ml

(Discoloration evaluation test)
Two aluminum plates A-1050 (60 mm × 80 mm × 1.2 mm) defined in JIS H 4000 are prepared, 0.1 g of oil agent is dropped on one sheet, and the oil agent is sandwiched between another aluminum plate. A load of 100 g is applied from above, and the mixture is allowed to stand for 100 hours at 50 ° C. and 95% humidity. Thereafter, the surface sandwiching the oil was observed to confirm the presence or absence of discoloration.
The same evaluation was performed using a cold rolled steel plate SPCC panel (60 mm × 80 mm × 1.2 mm) defined in JIS G 3141.

  From Table 1, it can be seen that the lubricating oil composition for aluminum processing of the present invention has high tapping energy efficiency, excellent lubricity, a low rate of decrease in tapping energy efficiency, and excellent wear resistance. Furthermore, it turns out that there is no discoloration with respect to aluminum.

Since the lubricating oil composition for aluminum processing of the present invention is excellent in processing performance such as processing efficiency and tool life, and further in handleability, it can be suitably used in a wide range of applications in the metal processing field of aluminum. . Specific examples of metal processing include cutting, grinding, rolling, forging, pressing, drawing, rolling, and the like. Among these, the lubricating oil composition for aluminum processing of the present invention is very useful for applications such as cutting, grinding, and rolling.
Furthermore, the lubricating oil composition for aluminum processing of the present invention can be used as a lubricating oil other than the machined part of a machine tool such as a sliding surface oil, a bearing part oil, a hydraulic equipment oil, Therefore, it is very useful in that the machine tool can save space and energy.

Claims (2)

Mineral oil and / or poly α-olefin or hydride thereof containing aluminum and aluminum containing 16 to 50 % by mass of a branched monohydric alcohol having 3 to 18 carbon atoms based on the total amount of the composition as a main component Lubricating oil composition for cutting and grinding metal . 2. The lubricating oil composition for cutting and grinding according to claim 1, comprising one or more additives selected from an oily agent, an extreme pressure agent, an organic acid salt, and an antioxidant.