JP5071999B2 - Lubricating oil composition for metal working - Google Patents

Description

  The present invention relates to a lubricating oil composition for metal processing used in various processing of various metals. Examples of metals to which the lubricating oil composition for metal working of the present invention is applied include aluminum, magnesium and alloys thereof, transition metals such as copper, iron, chromium, nickel, zinc, tin, titanium, and alloys thereof. Can be mentioned. Examples of applicable processing methods include cold, warm and hot rolling, pressing, punching, ironing, drawing, drawing, forging, metal processing such as cutting and grinding, including micro-trace cutting (MQL), etc. Can do. In particular, processing of aluminum fin material (flat pure aluminum (purity 99% or more) or an alloy containing aluminum as a main component), high-purity aluminum (purity 99.9% or more (having a purity of 99.99% or more) )) And an alloy containing aluminum as a main component, or a metal other than aluminum and an alloy containing them as a main component, are suitable for cold, warm and hot rolling. In the present invention, unless otherwise specified, hereinafter, aluminum represents a generic name of pure aluminum (including high-purity aluminum) and alloys containing aluminum as a main component.

  Aluminum fins used in heat exchangers of refrigerator / freezer systems such as refrigerators and air conditioners are manufactured by plastic processing such as overhanging, drawing, punching, curling, ironing, etc. . Processing of these aluminum fin materials is usually performed using a processing oil agent, and a processing oil agent in which an oily agent such as a fatty acid, a fatty acid ester, a higher alcohol, or an α-olefin is added to a synthetic hydrocarbon such as mineral oil or isoparaffin. Is used (for example, refer to Patent Document 1). However, with these processing fluids, sufficient lubricity cannot be obtained, and aluminum may adhere to the punch or damage to the material surface may be observed. Increasing the amount of additive added to solve these problems results in incomplete removal of the oil due to heat, causing discoloration and other appearance problems, and increasing the odor and worsening the work environment, causing water leakage. The performance as a fin, such as sex, is also hindered, and the oil cost increases.

In the rolling of aluminum and other metals, conventionally higher alcohols, fatty acid esters, fatty acids, alkylene glycol esterified products, α-olefins and the like are conventionally used as oiliness agents for rolling oils. Have been used (for example, see Patent Documents 2 to 3). However, in order to improve productivity, it is necessary to roll the metal at a higher speed and at a higher reduction rate, and the lubrication site is exposed to a higher temperature. In addition, the rolling of high-purity materials that are generally called nine nine, three nine, and four nines with a purity of 99%, 99.9%, and 99.99% causes significant adhesion, and the lubricity is hindered. A large amount of wear powder is generated, which hinders productivity improvement. For this reason, a sufficient rolling limit cannot be obtained by adding a conventionally known oily agent, and measures such as increasing the amount of the oily agent added or reducing the rolling speed or reduction rate are taken. However, by increasing the oil-based agent, the removal of the oil agent due to heat becomes incomplete and stains are likely to occur during annealing. Problems such as a decrease in plate quality such as an increase in quantity, a deterioration of the working environment due to an increase in the odor of the oil agent, and an increase in rolling costs arise. On the other hand, lowering the rolling speed and rolling reduction is not preferable because productivity is lowered.
Japanese Patent Laid-Open No. 2-133495 No. 2003-165993 2003-165994

  The present invention has been made in view of such circumstances, and its purpose is to withstand high productivity and maintain high oil agent removability while maintaining high oil removal properties under severe lubrication conditions. An object of the present invention is to provide a lubricating oil composition for metal working that does not cause deterioration, suppresses deterioration of product quality, and does not increase oil cost.

As a result of intensive studies to solve the above problems, the present inventors have achieved high speed and high speed by using a high-performance metalworking lubricant in which an epoxy compound is blended with mineral oil, synthetic oil, or oil. Withstands processing at the processing rate, and has good oil agent removability, there are few stains and discoloration after oil agent removal, it does not cause deterioration of the work environment such as odor and rough skin, suppresses product quality deterioration and increases oil agent cost. The inventors have found that it can be suppressed, and have completed the present invention. In particular, in terms of product quality, aluminum fin processing has good lubricity, so aluminum adhesion to the punch, damage to the surface to be processed, and increase in wear powder amount are suppressed. It has been found that the increase in unevenness and the amount of wear powder is suppressed.
That is, the lubricating oil composition for metal working of the present invention is characterized by containing an epoxy compound in one or more base oils selected from mineral oils, synthetic oils and fats and oils.

Hereinafter, the present invention will be described in detail.
As the base oil of the present invention, any of mineral oil, synthetic oil, and oil can be used, and the kind thereof is not limited, but mineral oil or synthetic oil is particularly preferable.

  Examples of mineral oil that can be used in the present invention include, for example, a kerosene fraction obtained by distillation of a paraffinic or naphthenic crude oil; a normal paraffin obtained by an extraction operation from the kerosene fraction; and a paraffinic or naphthenic fraction. Appropriate one or more refining treatments such as solvent deburring, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid washing, and clay treatment for lubricating oil fractions obtained by crude oil distillation The thing refine | purified in combination is mentioned.

  The aromatic content in the mineral oil is not particularly limited, but if the work environment is important, it is preferably 25% by volume or less, more preferably 15% by volume or less, still more preferably 10% by volume or less, and still more preferably 8% by volume. % Or less, more preferably 5% by volume or less, even more preferably 2% by volume or less, and most preferably 1% by volume or less. Here, the aromatic content means a value measured according to the fluorescent indicator adsorption method of JIS K 2536 “Petroleum products-hydrocarbon type test”. In particular, in the processing of aluminum fins, the aromatic content is preferably 5% by volume or less, more preferably 3% by volume or less, still more preferably 2% by volume or less, and most preferably 1% by volume or less. By setting the aromatic content to 5% by volume or less, odor, rough skin, and the like can be prevented. In the rolling of aluminum, the aromatic content is 10% by volume or less, preferably 8% by volume or less, more preferably 6% by volume or less, still more preferably 4% by volume or less, and still more preferably 3% by volume or less. Preferably it is 2 volume% or less.

  The naphthene content is not particularly limited but is preferably 10% by volume or more, more preferably 15% by volume or more, still more preferably 20% by volume or more, still more preferably 25% by volume or more, and most preferably 30% by volume. % Or more. By setting the naphthene content to 10% by volume or more, oil agent removability and processability in the oil agent removing step are improved. On the other hand, the naphthene content is preferably 90% by volume or less, more preferably 80% by volume or less, still more preferably 75% by volume or less, and most preferably 70% by volume or less. By making the naphthene content 90% by volume or less, volatilization of the oil agent at room temperature can be prevented.

  The paraffin content in the mineral oil is preferably 5% by volume or more, more preferably 10% by volume or more, and still more preferably 20% by volume or more. By setting the paraffin content to 5% by volume or more, the odor of the oil agent can be prevented. On the other hand, the paraffin content is preferably 90% by volume or less, more preferably 80% by volume or less, and still more preferably 70% by volume or less. By making the paraffin content 90% by volume or less, it is possible to improve the effect of preventing adhesion during processing.

  In the present invention, the naphthene content and the paraffin content are determined by the molecular ion intensity obtained by mass spectrometry by FI ionization (using a glass reservoir). The measurement method is specifically shown below.

(1) An adsorption tube for elution chromatography having a diameter of 18 mm and a length of 980 mm is packed with 120 g of silica gel (grade 923 manufactured by Fuji Devison Chemical Co., Ltd.) activated by drying at about 175 ° C. for 3 hours. .
(2) Inject 75 ml of n-pentane and pre-wet the silica gel.
(3) About 2 g of the sample is precisely weighed, diluted with an equal volume of n-pentane, and the obtained sample solution is injected.
(4) When the liquid level of the sample solution reaches the upper end of the silica gel, 140 ml of n-pentane is injected to separate the saturated hydrocarbon component, and the eluate is recovered from the lower end of the adsorption tube.
(5) Apply the eluate to a rotary evaporator to distill off the solvent to obtain a saturated hydrocarbon component.
(6) Type analysis of saturated hydrocarbon components with a mass spectrometer. As an ionization method in mass spectrometry, FI ionization method using a glass reservoir is used, and JMS-AX505H manufactured by JEOL Ltd. is used as a mass spectrometer.

The measurement conditions are shown below.
Acceleration voltage: 3.0 kV, cathode voltage: −5 to −6 kV, resolution: about 500, emitter: carbon, emitter current: 5 mA, measurement range: mass number 35 to 700, auxiliary oven temperature: 300 ° C., separator temperature: 300 ° C, main oven temperature: 350 ° C, sample injection volume: 1 μl

The resulting molecular ion by mass spectrometry after isotope correction, paraffins from the mass number _{(C n H 2n + 2)} and naphthenes _{(C n H 2n, C n} H 2n-2, C n H 2n-4 ...) Are classified and arranged, the fraction of each ionic strength is obtained, and the content of each type with respect to the entire saturated hydrocarbon component is determined. Next, based on the content of the saturated hydrocarbon component, the content of paraffin and naphthene for the entire sample is determined.

  Details of data processing by the FI method mass spectrometry type analysis method are described in “Nisseki Review”, Vol. 33, No. 4, pages 135-142, particularly “2.2.3 Data Processing”. .

  The initial boiling point of mineral oil is preferably 150 ° C. or higher, more preferably 155 ° C. or higher, and still more preferably 160 ° C. or higher. By setting the initial boiling point of mineral oil to 150 ° C. or higher, volatilization of the oil agent at room temperature can be sufficiently prevented. On the other hand, the end point of mineral oil is preferably 350 ° C. or lower, more preferably 340 ° C. or lower, and further preferably 330 ° C. or lower. By making the end point of mineral oil 350 degrees C or less, the oil agent removability in an oil agent removal process can be made favorable. Further, the temperature difference between the initial boiling point and the end point of the mineral oil is preferably 100 ° C. or less, more preferably 90 ° C. or less, still more preferably 80 ° C. or less. By setting the temperature difference to 100 ° C. or less, it is possible to achieve both prevention of volatilization of the oil agent at room temperature and oil agent removability in the oil agent removing step. Here, the initial boiling point and the end point mean values measured in accordance with JIS K 2254 “Petroleum product-distillation test method”.

  Examples of synthetic oils that can be used in the present invention include olefin oligomers (propylene oligomers, isobutylene oligomers, polybutenes, 1-octene oligomers, 1-decene oligomers, ethylene-propylene oligomers, etc.) or their hydrides, alkylbenzenes, alkylnaphthalenes. , Diesters (ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate, di-2-ethylhexyl sebacate, etc.), polyol esters (trimethylolpropane caprylate, trimethylolpropane pelargonate, pentaerythritol 2) -Ethyl hexanoate, pentaerythritol pelargonate, etc.), polyglycol, silicone oil, dialkyl diphenyl ether, and Polyphenyl ether and the like. Among these, propylene oligomer hydride, isobutylene oligomer hydride and polybutene hydride are collectively called isoparaffin.

  Examples of the fats and oils that can be used in the present invention include beef tallow, lard, soybean oil, rapeseed oil, rice bran oil, coconut oil, palm oil, palm kernel oil, hydrogenated products thereof, or a mixture of two or more of these. .

  Mineral oil or isoparaffin is preferable as the base oil of the aluminum fin processing oil, and isoparaffin is more preferable from the viewpoint of good drying properties and low odor. As the base oil of the rolling oil, any of mineral oil, synthetic oil, and oil can be used, but as the base oil of the aluminum rolling oil, the aromatic content is 10% by volume or less, the naphthene content is 20 to 90% by volume, and the paraffin content is 5%. Mineral oil of ˜80% by volume is more preferable, and the base oil of the rolling oil of metal other than aluminum is more preferably a mineral oil having an aromatic content of 25% by volume or less, a naphthene content of 10-80% by volume, and a paraffin content of 10-90% by volume. preferable.

The kinematic viscosity at 40 ° C. of the base oil is 1.0 to 500 mm ² / s, preferably 1.2 to 400 mm ² / s, more preferably 1.4 to 350 mm ² / s. If the viscosity is too low, the lubricity may be lowered, and if it is too high, there may be a problem in supplying the oil to the processed part.
However, the optimum viscosity of the base oil varies depending on the purpose of use, and in aluminum fin processing, the kinematic viscosity at 40 ° C. is 1.2 to 5.0 mm ² / s, preferably 1.3 to 4.8 mm ² / s, more preferably The range is 1.4 to 4.7 mm ² / s. If the kinematic viscosity (40 ° C) of the base oil is too low, sufficient lubricity may not be obtained, and the volatility of the base oil may increase the risk of fire, etc. due to ignition. If the amount is too large, there may be a problem in the supply of the oil to the processed part, and the oil agent removability in the oil agent removing step may be deteriorated, causing discoloration and the like.

The optimal kinematic viscosity at 40 ° C. in aluminum rolling is in the range of 1.0 to 10 mm ² / s, preferably 1.2 to 8.0 mm ² / s, more preferably 1.4 to 6.0 mm ² / s. . Optimum kinematic viscosity at 40 ° C. in the rolling of metals other than aluminum is 2.0 to 30 mm ² / s, preferably 2.5 to ²⁰ mm ² / s, more preferably 3.0 to 15 mm ² / s. . When the kinematic viscosity (40 ° C.) of the base oil is too low, sufficient lubricity may not be obtained, and since the volatility is high, there is a risk of increased risk of fire due to ignition. On the other hand, if it is too high, there may be a problem in the supply of the oil to the processed part, and the oil agent removal property is poor, so that the lubricating oil component called stain is easily seized after annealing, and the surface of the work material May cause surface gloss deterioration due to surface damage called oil pits, slip due to over-lubrication, increased wear powder generation, scratches on the surface of the work material, and inability to process if the slip is significant. .

Examples of the epoxy compound used in the lubricating oil composition for metal working of the present invention include epoxy compounds represented by the following (E-1) to (E-8).
(E-1) Phenyl glycidyl ether type epoxy compound (E-2) Alkyl glycidyl ether type epoxy compound (E-3) Glycidyl ester type epoxy compound (E-4) Aryl oxirane compound (E-5) Alkyl oxirane compound (E -6) Alicyclic epoxy compound (E-7) Epoxidized fatty acid monoester (E-8) Epoxidized vegetable oil

Below, (E-1)-(E-8) component is explained in full detail.
Specific examples of the (E-1) phenyl glycidyl ether type epoxy compound include phenyl glycidyl ether and alkylphenyl glycidyl ether. Examples of the alkylphenyl glycidyl ether herein include those having 1 to 3 alkyl groups having 1 to 13 carbon atoms, and those having one alkyl group having 4 to 10 carbon atoms, such as n-butylphenyl. Glycidyl ether, i-butylphenyl glycidyl ether, sec-butylphenyl glycidyl ether, t-butylphenyl glycidyl ether, pentylphenyl glycidyl ether, hexylphenyl glycidyl ether, heptylphenyl glycidyl ether, octylphenyl glycidyl ether, nonylphenyl glycidyl ether, decyl Phenyl glycidyl ether etc. can be illustrated as a preferable thing.

  (E-2) Specifically, as the alkyl glycidyl ether type epoxy compound, hexyl glycidyl ether, heptyl glycidyl ether, octyl glycidyl ether, nonyl glycidyl ether, decyl glycidyl ether, undecyl glycidyl ether, dodecyl glycidyl ether, tridecyl Glycidyl ether, tetradecyl glycidyl ether, 2-ethylhexyl glycidyl ether, neopentyl glycol diglycidyl ether, trimethylolpropane triglycidyl ether, pentaerythritol tetraglycidyl ether, 1,6-hexanediol diglycidyl ether, sorbitol polyglycidyl ether, poly Alkylene glycol monoglycidyl ether, polyalkylene glycol diglycy Ether and the like.

Specific examples of the (E-3) glycidyl ester type epoxy compound include compounds represented by the following general formula (1).

In said formula (1), R represents a C1-C18 hydrocarbon group. Examples of such a hydrocarbon group include an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 2 to 18 carbon atoms, a cycloalkyl group having 5 to 7 carbon atoms, an alkylcycloalkyl group having 6 to 18 carbon atoms, and a carbon number. A 6-10 aryl group, a C7-18 alkylaryl group, a C7-18 arylalkyl group, etc. are mentioned. Among these, an alkylphenyl group having an alkyl group having 5 to 15 carbon atoms, an alkenyl group having 2 to 15 carbon atoms, a phenyl group, and an alkyl group having 1 to 4 carbon atoms is preferable.
Specific examples of glycidyl ester type epoxy compounds include glycidyl-2,2-dimethyloctanoate, glycidyl benzoate, glycidyl-t-butyl benzoate, glycidyl acrylate, and glycidyl methacrylate.

  Specific examples of the (E-4) aryloxirane compound include 1,2-epoxystyrene, alkyl-1,2-epoxystyrene, and the like.

  Specific examples of (E-5) alkyloxirane compounds include 1,2-epoxybutane, 1,2-epoxypentane, 1,2-epoxyhexane, 1,2-epoxyheptane, and 1,2-epoxyoctane. 1,2-epoxynonane, 1,2-epoxydecane, 1,2-epoxyundecane, 1,2-epoxydodecane, 1,2-epoxytridecane, 1,2-epoxytetradecane, 1,2-epoxypentadecane 1,2-epoxyhexadecane, 1,2-epoxyheptadecane, 1,2-epoxyoctadecane, 1,2-epoxynonadecane, 1,2-epoxyicosane and the like.

(E-6) As an alicyclic epoxy compound, the compound in which the carbon atom which comprises an epoxy group directly comprises the alicyclic ring like the compound represented by following General formula (2) is mentioned. .

  Specific examples of the alicyclic epoxy compound include 1,2-epoxycyclohexane, 1,2-epoxycyclopentane, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, and bis (3,4 -Epoxycyclohexylmethyl) adipate, exo-2,3-epoxynorbornane, bis (3,4-epoxy-6-methylcyclohexylmethyl) adipate, 2- (7-oxabicyclo [4.1.0] hept-3- Yl) -spiro (1,3-dioxane-5,3 ′-[7] oxabicyclo [4.1.0] heptane, 4- (1′-methylepoxyethyl) -1,2-epoxy-2-methyl Examples include cyclohexane and 4-epoxyethyl-1,2-epoxycyclohexane.

  Specific examples of the (E-7) epoxidized fatty acid monoester include esters of an epoxidized fatty acid having 12 to 20 carbon atoms with an alcohol or phenol having 1 to 8 carbon atoms or an alkylphenol. In particular, butyl, hexyl, benzyl, cyclohexyl, methoxyethyl, octyl, phenyl and butylphenyl esters of epoxy stearate are preferably used.

  Specific examples of (E-8) epoxidized vegetable oils include epoxy compounds of vegetable oils such as soybean oil, linseed oil, and cottonseed oil.

In the lubricating oil composition for metal working of the present invention, only one type of epoxy compound selected from the above (E-1) to (E-8) may be used, or two or more types may be used in combination. May be.
Moreover, in this invention, as an epoxy compound, (E-2), (E-3), and (E-5) are preferable among (E-1)-(E-8), (E-2) (E-5) is more preferable, and (E-5) is most preferable.

In the lubricating oil composition for metal working of the present invention, the content of the epoxy compound is 0.01 to 10.0 mass%, preferably 0.05 to 7.5 mass%, more preferably 0.1 based on the total amount of the composition. -6.0 mass%. If the content is less than 0.01% by mass, the lubricity improvement effect may not be expected. If the content is more than 10% by mass, not only the lubricity improvement effect corresponding to the addition amount cannot be expected, but also the removal of oil by heat is not possible. Further, in the case of rolling oil, lubricity may be hindered or gloss unevenness may occur depending on conditions.
Epoxy compounds can be used as an alternative to oily agents, and when used in combination with oily agents, the amount of oily agent used can be reduced, leading to improvements in the work environment such as odor reduction.

The lubricating oil composition for metal working of the present invention can further contain an oxygen-containing compound in order to further improve workability. Examples of such oxygen-containing compounds include at least one oxygen-containing compound selected from the group consisting of the following components (A1) to (A8).
(A1) Alkylene oxide adduct of polyhydric alcohol having 3 to 6 hydroxyl groups having a number average molecular weight of 100 or more and 1000 or less (A2) Hydrocarbyl ether or hydrocarbyl ester of component (A1) (A3) Number average molecular weight (A4) Hydrocarbyl ether or hydrocarbyl ester of component (A3) (A5) Dihydric alcohol having 2 to 20 carbon atoms (A6) Hydrocarbyl ether of component (A5) or Hydrocarbyl ester (A7) Trivalent alcohol having 3 to 20 carbon atoms (A8) Hydrocarbyl ether or hydrocarbyl ester of component (A7) above

(A1) The polyhydric alcohol which comprises a component has 3-6 hydroxyl groups. In addition to the following polyhydric alcohols, saccharides can also be used as the polyhydric alcohol having 3 to 6 hydroxyl groups.
Examples of the polyhydric alcohol include glycerin, polyglycerin (a dimer to tetramer of glycerin, such as diglycerin, triglycerin, and tetraglycerin), trimethylol alkane (for example, trimethylolethane, trimethylolpropane, and trimethylolbutane), And 2- to 4-mer thereof, pentaerythritol, dipentaerythritol, 1,2,4-butanetriol, 1,3,5-pentanetriol, 1,2,6-hexanetriol, 1,2,3,4 -Butanetetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol, xylitol, mannitol, idylitol, taritol, dulcitol, allitol and the like.
Examples of the saccharide include xylose, arabinose, ribose, rhamnose, glucose, fructose, galactose, mannose, sorbose, cellobiose, mannose, isomaltose, trehalose, sucrose and the like. Among these, glycerin, trimethylol alkane, and sorbitol are preferable from the viewpoint of excellent processability.

Moreover, as alkylene oxide which comprises (A1) component, C2-C6, Preferably C2-C4 alkylene oxide is used. Examples of the alkylene oxide having 2 to 6 carbon atoms include ethylene oxide, propylene oxide, 1,2-epoxybutane (α-butylene oxide), 2,3-epoxybutane (β-butylene oxide), 1,2-epoxy-1- Examples include methylpropane, 1,2-epoxyheptane, and 1,2-epoxyhexane. Among these, ethylene oxide, propylene oxide, and butylene oxide are preferable from the viewpoint of excellent processability, and ethylene oxide and propylene oxide are more preferable.
When two or more kinds of alkylene oxide are used, there is no particular limitation on the polymerization mode of the oxyalkylene group, and random copolymerization or block copolymerization may be performed. Moreover, when adding an alkylene oxide to the polyhydric alcohol which has 3-6 hydroxyl groups, you may add to all the hydroxyl groups, and you may add to only one hydroxyl group. Among these, it is preferable to add to all hydroxyl groups from the viewpoint of excellent processability.

  Furthermore, the number average molecular weight (Mn) of the component (A1) is 100 or more and 1000 or less, preferably 100 or more and 800 or less. When Mn is less than 100, the solubility in mineral oil may be reduced. On the other hand, when Mn is larger than 1000, the oil agent may remain on the surface of the processed material after the processing in the oil agent removing step. In addition, Mn in this invention says the number average molecular weight of conversion of the standard polystyrene by gel permeation chromatography (GPC).

  As (A1) component, you may use what added the alkylene oxide to the polyhydric alcohol which has 3-6 hydroxyl groups so that Mn may be 100-1000. In addition, a mixture of polyhydric alcohol alkylene oxide adducts having 3 to 6 hydroxyl groups obtained by an arbitrary method or a commercially available mixture of polyhydric alcohol alkylene oxide adducts having 3 to 6 hydroxyl groups is distilled. Alternatively, those separated so that Mn may be 100 or more and 1000 or less by chromatography may be used. In addition, as (A1) component, you may use these compounds individually or in mixture of 2 or more types.

Component (A2) is a hydrocarbyl etherified or esterified polyhydric alcohol alkylene oxide adduct having 3 to 6 hydroxyl groups with Mn of 100 or more and 1000 or less, preferably 100 or more and 800 or less. .
As the component (A2), a product obtained by hydrocarbyl etherifying or esterifying part or all of the terminal hydroxyl groups of the alkylene oxide adduct of the component (A1) can be used. The hydrocarbyl group referred to herein 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.

  Examples of the alkyl group having 1 to 24 carbon atoms include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, t-butyl group, linear or branched pentyl. Group, linear or branched hexyl group, linear or branched heptyl group, linear or branched octyl group, linear or branched nonyl group, linear or branched decyl group, linear or Branched undecyl group, linear or branched dodecyl group, linear or branched tridecyl group, linear or branched tetradecyl group, linear or branched pentadecyl group, linear or branched hexadecyl group Linear or branched heptadecyl group, linear or branched octadecyl group, linear or branched nonadecyl group, linear or branched icosyl group, linear or branched heicosyl group, linear or branched Branch Cosyl group, straight or branched tricosyl group, tetracosyl group of straight or branched may be mentioned.

  Examples of the alkenyl group having 2 to 24 carbon atoms include a vinyl group, a linear or branched propenyl group, a linear or branched butenyl group, a linear or branched pentenyl group, and a linear or branched hexenyl group. , Linear or branched heptenyl group, linear or branched octenyl group, linear or branched nonenyl group, linear or branched decenyl group, linear or branched undecenyl group, linear or branched A branched dodecenyl group, a linear or branched tridecenyl group, a linear or branched tetradecenyl group, a linear or branched pentadecenyl group, a linear or branched hexadecenyl group, a linear or branched heptadecenyl group, Linear or branched octadecenyl group, linear or branched nonadecenyl group, linear or branched icocenyl group, linear or branched henicosenyl group, linear or branched dococenyl group Group, straight or branched tricosenyl group, tetracosenyl group of straight or branched may be mentioned.

  Examples of the cycloalkyl group having 5 to 7 carbon atoms include a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group. Examples of the alkylcycloalkyl group having 6 to 11 carbon atoms include methylcyclopentyl group, dimethylcyclopentyl group (including all structural isomers), methylethylcyclopentyl group (including all structural isomers), and diethylcyclopentyl group ( Including all structural isomers), methylcyclohexyl group, dimethylcyclohexyl group (including all structural isomers), methylethylcyclohexyl group (including all structural isomers), diethylcyclohexyl group (all structures) Isomers), methylcycloheptyl group, dimethylcycloheptyl group (including all structural isomers), methylethylcycloheptyl group (including all structural isomers), diethylcycloheptyl group (all Including structural isomers).

  Examples of the aryl group having 6 to 10 carbon atoms include a phenyl group and a naphthyl group. Examples of the alkylaryl group having 7 to 18 carbon atoms include a tolyl group (including all structural isomers), a xylyl group (including all structural isomers), and an ethylphenyl group (including all structural isomers). ), Linear or branched propylphenyl group (including all structural isomers), linear or branched butylphenyl group (including all structural isomers), linear or branched pentylphenyl Groups (including all structural isomers), linear or branched hexylphenyl groups (including all structural isomers), linear or branched heptylphenyl groups (including all structural isomers). ), Linear or branched octylphenyl group (including all structural isomers), linear or branched nonylphenyl group (including all structural isomers), linear or branched decylphenyl Group (including all structural isomers) .), Including straight-chain or branched undecylphenyl (all structural isomers.), Including straight-chain or branched dodecylphenyl group (all structural isomers.), And the like.

  Examples of the arylalkyl group having 7 to 12 carbon atoms include benzyl group, phenylethyl group, phenylpropyl group (including propyl group isomers), phenylbutyl group (including butyl group isomers), and phenylpentyl group ( Pentyl group isomers), phenylhexyl group (including hexyl isomers), and the like.

  Among these, from the viewpoint of excellent processability, 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 a carbon number of 3 to 12 is preferable. A linear or branched alkyl group or an oleyl group (residue obtained by removing a hydroxyl group from oleyl alcohol) is more preferred.

  As the acid used for esterification, carboxylic acid is usually mentioned. The carboxylic acid may be a monobasic acid or a polybasic acid, but a monobasic acid is usually used. Examples of monobasic acids include fatty acids having 6 to 24 carbon atoms, which may be linear or branched. The monobasic acid may be a saturated fatty acid, an unsaturated fatty acid, or a mixture thereof.

  Saturated fatty acids include linear or branched hexanoic acid, linear or branched octanoic acid, linear or branched nonanoic acid, linear or branched decanoic acid, linear or branched undecanoic acid, Linear or branched dodecanoic acid, linear or branched tridecanoic acid, linear or branched tetradecanoic acid, linear or branched pentadecanoic acid, linear or branched hexadecanoic acid, linear or branched Octadecanoic acid, linear or branched hydroxyoctadecanoic acid, linear or branched nonadecanoic acid, linear or branched eicosanoic acid, linear or branched heneicosanoic acid, linear or branched docosanoic acid, Examples thereof include linear or branched tricosanoic acid, linear or branched tetracosanoic acid, and the like.

  Examples of unsaturated fatty acids include linear or branched hexenoic acid, linear or branched heptenoic acid, linear or branched octenoic acid, linear or branched nonenic 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 Branched hexadecenoic acid, linear or branched octadecenoic acid, linear or branched hydroxyoctadecenoic acid, linear or branched nonadecenoic acid, linear or branched eicosenoic acid, linear or branched heneicosene Examples thereof include acid, linear or branched docosenoic acid, linear or branched tricosenoic acid, and linear or branched tetracosenoic acid.

  Of these, saturated fatty acids having 8 to 20 carbon atoms, unsaturated fatty acids having 8 to 20 carbon atoms, and mixtures thereof are particularly preferable. In addition, as (A2) component, you may use these compounds individually or in mixture of 2 or more types.

The component (A3) is a polyalkylene glycol having a Mn of 100 or more and 1000 or less, and one obtained by homopolymerizing or copolymerizing an alkylene oxide having 2 to 6 carbon atoms, preferably 2 to 4 carbon atoms. Examples of the alkylene oxide having 2 to 6 carbon atoms include the alkylene oxides listed in the description of the component (A1). Among these, ethylene oxide, propylene oxide, and butylene oxide are preferable from the viewpoint of excellent processability, and ethylene oxide and propylene oxide are more preferable.
In addition, when 2 or more types of alkylene oxide is used at the time of preparation of polyalkylene glycol, there is no restriction | limiting in particular in the polymerization form of an oxyalkylene group, You may carry out random copolymerization or block copolymerization.

Moreover, as (A3) component, Mn is 100 or more and 1000 or less, Preferably it is 120 or more and 700 or less. A polyalkylene glycol having an Mn of less than 100 may reduce the solubility in mineral oil. On the other hand, polyalkylene glycol with Mn greater than 1000 may cause the oil to remain on the surface of the processed material after processing in the oil agent removing step.
Furthermore, as the component (A3), a component that is reacted so that Mn is 100 or more and 1000 or less when the alkylene oxide is polymerized may be used. Moreover, you may use what isolate | separated the polyalkylene glycol mixture obtained by arbitrary methods, and the commercially available polyalkylene glycol mixture so that Mn might be set to 100 or more and 1000 or less by distillation or chromatography. In addition, as (A3) component, you may use these compounds individually or in mixture of 2 or more types.

  The component (A4) is a hydrocarbyl etherified or esterified polyalkylene glycol having a Mn of 100 to 1000, preferably 120 to 700. As the component (A4), hydrocarbyl etherified or esterified part or all of the terminal hydroxyl groups of the polyalkylene glycol of the component (A3) can be used. The hydrocarbyl group as used herein represents a hydrocarbon group having 1 to 24 carbon atoms, and specifically includes the groups listed in the description of the component (A2). Among these, from the viewpoint of excellent processability, 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 a carbon number of 3 to 12 is preferable. A linear or branched alkyl group or an oleyl group (residue obtained by removing a hydroxyl group from oleyl alcohol) is more preferred.

  Further, as the component (A4), those obtained by esterifying the terminal hydroxyl group of the polyalkylene glycol of the component (A3) can also be used. As the acid used for esterification, a carboxylic acid is usually used. The carboxylic acid may be a monobasic acid or a polybasic acid, but a monobasic acid is usually used. Specific examples include those listed in the description of the component (A2). In addition, as the component (A4), these compounds may be used alone or as a mixture of two or more.

  The component (A5) is a dihydric alcohol having 2 to 20 carbon atoms, preferably 3 to 18 carbon atoms. A dihydric alcohol here means what has no ether bond in a molecule | numerator. Examples of the dihydric alcohol having 2 to 20 carbon atoms include ethylene glycol, 1,3-propanediol, 1,2-propanediol, 1,4-butanediol, 1,2-butanediol, and 2-methyl-1,3. -Propanediol, 1,5-pentanediol, 1,2-pentanediol, neopentyl glycol, 1,6-hexanediol, 1,2-hexanediol, 2-ethyl-2-methyl-1,3-propanediol 2-methyl-2,4-pentanediol, 1,7-heptanediol, 1,2-heptanediol, 2-methyl-2-propyl-1,3-propanediol, 2,2-diethyl-1,3 -Propanediol, 1,8-octanediol, 1,2-octanediol, 1,9-nonanediol, 1,2-nonanediol, 2- Til-2-ethyl-1,3-propanediol, 1,10-decanediol, 1,2-decanediol, 1,11-undecanediol, 1,2-undecanediol, 1,12-dodecanediol, 1, 2-dodecanediol, 1,13-tridecanediol, 1,2-tridecanediol, 1,14-tetradecanediol, 1,2-tetradecanediol, 1,15-heptadecanediol, 1,2-heptadecanediol 1,16-hexadecanediol, 1,2-hexadecanediol, 1,17-heptadecanediol, 1,2-heptadecanediol, 1,18-octadecanediol, 1,2-octadecanediol, 1,19-nona Decanediol, 1,2-nonadecanediol, 1,20-icosadecanediol, 1, 2-Icosadecanediol etc. are mentioned.

  Among these, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 2-methyl-2,4-pentanediol, 2- Ethyl-2-methyl-1,3-propanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, 1, 12-dodecanediol and the like are preferable. In addition, as (A5) component, you may use these compounds individually or in mixture of 2 or more types.

  Component (A6) is a hydrocarbyl etherified or esterified dihydric alcohol having 2 to 20 carbon atoms, preferably 3 to 18 carbon atoms (excluding those having an ether bond in the molecule). It has been made. As the component (A6), one obtained by hydrolyzing a part or all of the terminal hydroxyl groups of the dihydric alcohol of the component (A5) can be used. The hydrocarbyl group as used herein represents a hydrocarbon group having 1 to 24 carbon atoms, and specifically includes the groups listed in the description of the component (A2). Among these, from the viewpoint of excellent processability, 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 a carbon number of 3 to 12 is preferable. A linear or branched alkyl group or an oleyl group (residue obtained by removing a hydroxyl group from oleyl alcohol) is more preferable.

  As the component (A6), one obtained by esterifying one or both of the terminal hydroxyl groups of the dihydric alcohol of the component (A5) can also be used. As the acid used for esterification, carboxylic acid is usually mentioned. The carboxylic acid may be a monobasic acid or a polybasic acid, but a monobasic acid is usually used. Specific examples include those listed in the description of the component (A2). Furthermore, the ester of the component (A6) may be one obtained by esterifying one of the terminal hydroxyl groups of the dihydric alcohol of the component (A5) (partial ester), or one obtained by esterifying both of the terminal hydroxyl groups (completely). Ester). In these, it is preferable that it is a partial ester from the point which is excellent in workability. In addition, as (A6) component, you may use these compounds individually or in mixture of 2 or more types.

  The component (A7) is a trivalent alcohol having 3 to 20 carbon atoms, preferably 3 to 18 carbon atoms. The trihydric alcohol here means one having no ether bond in the molecule. Examples of the trihydric alcohol having 3 to 20 carbon atoms include glycerin, 1,2,3-butanetriol, 1,2,4-butanetriol, 1,2,5-pentanetriol, 1,3,5-pentanetriol, 1,2,3-pentanetriol, 1,2,4-pentanetriol, 1,2,6-hexanetriol, 1,2,3-hexanetriol, 1,2,4-hexanetriol, 1,2,5 -Hexanetriol, 1,3,4-hexanetriol, 1,3,5-hexanetriol, 1,3,6-hexanetriol, 1,4,5-hexanetriol, 1,2,7-heptanetriol, 1 , 2,8-octanetriol, 1,2,9-nonanetriol, 1,2,10-decanetriol, 1,2,11-undecantriol, 1,2, 2-dodecanetriol, 1,2,13-tridecanetriol, 1,2,14-tetradecanetriol, 1,2,15-pentadecanetriol, 1,2,16-hexadecanetriol, 1,2,17- Examples include heptadecane triol, 1,2,18-octadecane triol, 1,2,19-nonadecane triol, 1,2,20-icosan triol.

  Among these, 1,2,12-dodecanetriol, 1,2,13-tridecanetriol, 1,2,14-tetradecanetriol, 1,2,15-pentadecanetriol, , 2,16-hexadecanetriol, 1,2,17-heptadecanetriol, 1,2,18-octadecanetriol are preferred. In addition, as (A7) component, you may use these compounds individually or as a 2 or more types of mixture.

  Component (A8) is a hydrocarbyl etherified or esterified trivalent alcohol having 3 to 20 carbon atoms, preferably 3 to 18 carbon atoms (excluding those having an ether bond in the molecule). It has been made. As the component (A8), one obtained by hydrolyzing a part or all of the terminal hydroxyl groups of the trihydric alcohol of the component (A7) can be used. The hydrocarbyl group as used herein represents a hydrocarbon group having 1 to 24 carbon atoms, and specifically includes the groups listed in the description of the component (A2). Among these, from the viewpoint of excellent processability, 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 a carbon number of 3 to 12 is preferable. A linear or branched alkyl group or an oleyl group (residue obtained by removing a hydroxyl group from oleyl alcohol) is more preferred.

  Moreover, as (A8) component, what esterified one or all of the terminal hydroxyl group of the trihydric alcohol of (A7) component can be used. As the acid used for esterification, carboxylic acid is usually mentioned. The carboxylic acid may be a monobasic acid or a polybasic acid, but a monobasic acid is usually used. Specific examples include those listed above for the component (A2). The ester of the component (A8) may be one obtained by esterifying one or two terminal hydroxyl groups of the trihydric alcohol of the component (A7) (partial ester), and all the terminal hydroxyl groups are esterified. (Complete ester) may be sufficient. In these, it is preferable that it is a partial ester from the point which is excellent in workability.

  As the component (A8), glycerin, 1,2,3-butanetriol, 1,2,4-butanetriol, 1,2,5-pentanetriol, 1,3,5-pentane among the components (A7) Triol, 1,2,3-pentanetriol, 1,2,4-pentanetriol, 1,2,6-hexanetriol, 1,2,3-hexanetriol, 1,2,4-hexanetriol, 1, Hydrocarbyl ethers or moieties of 2,5-hexanetriol, 1,3,4-hexanetriol, 1,3,5-hexanetriol, 1,3,6-hexanetriol and 1,4,5-hexanetriol Esters are preferred. In addition, as (A8) component, you may use these compounds individually or in mixture of 2 or more types.

  In the present invention, one oxygen-containing compound selected from the components (A1) to (A8) may be used alone, or a mixture of two or more oxygen-containing compounds having different structures may be used. Good. Among the above components (A1) to (A8), the component (A3), the component (A4), the component (A5), and the component (A8) are preferable from the viewpoint of excellent workability, and the component (A3), (A4) The component and the component (A8) are more preferable.

  Further, the content of the oxygen-containing compound in the lubricating oil composition for metal working of the present invention is 0.005 to 10.0% by mass based on the total amount of the lubricating oil composition. That is, the content of the oxygen-containing compound is 0.005% by mass or more, preferably 0.05% by mass or more, and more preferably 0.1% by mass or more. On the other hand, the content of the oxygen-containing compound is 10% by mass or less, preferably 5.0% by mass or less, more preferably 2.0% by mass or less. If the content of the oxygen-containing compound is too small, the effect of improving workability may be insufficient, and even if the content is increased, an effect commensurate with the content may not be obtained.

The lubricating oil composition for metal working of the present invention may further contain an oily agent. As the oily agent, in order to further improve the workability, it is preferable to use at least one oily agent selected from the following components (B1) to (B3). In addition, as an oiliness agent, what is normally used as an oiliness agent of lubricating oil is also contained.
(B1) Ester (B2) Monohydric alcohol (B3) Carboxylic acid

  The ester which is the component (B1) is obtained by reacting an alcohol with a carboxylic acid. The alcohol may be a monohydric alcohol or a polyhydric alcohol. The carboxylic acid may be a monobasic acid or a polybasic acid.

  As the monohydric alcohol, a monohydric alcohol having 1 to 24 carbon atoms is usually used. Such alcohols may be linear or branched. Examples of the monohydric alcohol having 1 to 24 carbon atoms include methanol, ethanol, linear or branched propanol, linear or branched butanol, linear or branched pentanol, linear or branched hexanol, direct Linear or branched heptanol, linear or branched nonanol, linear or branched decanol, linear or branched undecanol, linear or branched dodecanol, linear or Branched tridecanol, linear or branched tetradecanol, linear or branched pentadecanol, linear or branched hexadecanol, linear or branched heptadecanol, linear or branched Octadecanol, linear or branched nonadecanol, linear or branched eicosanol, linear or branched heneicosanol, linear Other branched Torikosanoru, straight or branched tetracosanol, and mixtures thereof.

As the polyhydric alcohol, a dihydric alcohol having 2 to 10 valences, preferably 2 to 6 valences is usually used. Examples of the 2- to 10-valent alcohol include ethylene glycol, diethylene glycol, polyethylene glycol (3 to 15 mer of ethylene oxide), propylene glycol, dipropylene glycol, polypropylene glycol (3 to 15 mer of propylene oxide), and 1,3-propane. Diol, 1,2-propanediol, 1,3-butanediol, 1,4-butanediol, 2-methyl-1,2-propanediol, 2-methyl-1,3-propanediol, 1,2-pentane Diol, 1,3-pentanediol, 1,4-pentanediol, 1,5-pentanediol, neopentylglycol, glycerin, polyglycerin (diglycerin dimer to octamer, such as diglycerin, triglycerin, tetraglycerin ), Trimethylol al (For example, trimethylolethane, trimethylolpropane, trimethylolbutane) and their 2-8 mer, pentaerythritol and their 2-4 mer, 1,2,4-butanetriol, 1,3,5 -Pentanetriol, 1,2,6-hexanetriol, 1,2,3,4-butanetetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol, xylitol, mannitol and the like.
In addition, saccharides such as xylose, arabitol, ribose, rhamnose, glucose, fructose, galactose, mannose, sorbose, cellobiose, mannose, isomaltose, trehalose, sucrose can be used.

  Among these, ethylene glycol, diethylene glycol, polyethylene glycol (more preferably, 3-10 mer of ethylene oxide), propylene glycol, dipropylene glycol, polypropylene glycol (more preferably, 3-10 mer of propylene oxide), 1, 3-propanediol, 2-methyl-1,2-propanediol, 2-methyl-1,3-propanediol, neopentyl glycol, glycerin, diglycerin, triglycerin, trimethylol alkane (for example, trimethylol ethane, tri Methylolpropane, trimethylolbutane) and their dimers and tetramers, pentaerythritol, dipentaerythritol, 1,2,4-butanetriol, 1,3,5-pentanetriol, 1,2,6- Hexane triol, 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 more preferable. More preferred are ethylene glycol, propylene glycol, neopentyl glycol, glycerin, trimethylol ethane, trimethylol propane, pentaerythritol, sorbitan and mixtures thereof.

  Moreover, as a monobasic acid which comprises an ester oily agent, the linear or branched fatty acid which has C6-C24 normally is mentioned. The monobasic acid may be a saturated fatty acid, an unsaturated fatty acid, or a mixture thereof.

  Saturated fatty acids include linear or branched hexanoic acid, linear or branched octanoic acid, linear or branched nonanoic acid, linear or branched decanoic acid, linear or branched undecanoic acid , Linear or branched dodecanoic acid, linear or branched tridecanoic acid, linear or branched tetradecanoic acid, linear or branched pentadecanoic acid, linear or branched hexadecanoic acid, linear or branched Branched octadecanoic acid, linear or branched hydroxyoctadecanoic acid, linear or branched nonadecanoic acid, linear or branched eicosanoic acid, linear or branched heneicosanoic acid, linear or branched docosanoic acid , Linear or branched tricosanoic acid, linear or branched tetracosanoic acid and the like.

  Examples of unsaturated fatty acids include linear or branched hexenoic acid, linear or branched heptenoic acid, linear or branched octenoic acid, linear or branched nonenic 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 Branched hexadecenoic acid, linear or branched octadecenoic acid, linear or branched hydroxyoctadecenoic acid, linear or branched nonadecenoic acid, linear or branched eicosenoic acid, linear or branched heneicosene Examples thereof include acid, linear or branched docosenoic acid, linear or branched tricosenoic acid, and linear or branched tetracosenoic acid. Of these, saturated fatty acids having 8 to 20 carbon atoms, unsaturated fatty acids having 8 to 20 carbon atoms, and mixtures thereof are particularly preferable.

  Examples of the polybasic acid constituting the ester oil-based agent 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 a saturated dibasic acid, an unsaturated dibasic acid, or a mixture thereof.

  Saturated dibasic acids include ethanedioic acid, propanedioic acid, linear or branched butanedioic acid, linear or branched pentanedioic acid, linear or branched hexanedioic acid, linear or branched Branched octanedioic acid, linear or branched nonanedioic acid, linear or branched decanedioic acid, linear or branched undecanedioic acid, linear or branched dodecanedioic acid, linear or branched Examples include branched tridecanedioic acid, linear or branched tetradecanedioic acid, linear or branched heptadecanedioic acid, linear or branched hexadecanedioic acid, and the like.

  Examples of unsaturated dibasic acids include linear or branched hexene diacids, linear or branched octene diacids, linear or branched nonene diacids, linear or branched decene diacids, linear Or branched undecenedioic acid, linear or branched dodecenedioic acid, linear or branched tridecenedioic acid, linear or branched tetracenedioic acid, linear or branched heptacenedioic acid, linear Or a branched hexadecenedioic acid etc. are mentioned.

Examples of the ester oil-based agent include the following components (1b) to (7b). As the ester oily agent, an ester obtained by reacting an arbitrary alcohol with a carboxylic acid can be used as in these exemplified components, and is not particularly limited thereto.
(1b) ester of monohydric alcohol and monobasic acid (2b) ester of polyhydric alcohol and monobasic acid (3b) ester of monohydric alcohol and polybasic acid (4b) polyhydric alcohol and polybasic acid (5b) Mixed ester of monohydric alcohol and polyhydric alcohol and polybasic acid (6b) Mixed ester of polyhydric alcohol and monobasic acid and polybasic acid (7b) Monohydric alcohol And mixed esters of polyhydric alcohols with monobasic and polybasic acids

  In addition, when a polyhydric alcohol is used as the alcohol component, the ester is a complete ester in which all hydroxyl groups in the polyhydric alcohol are esterified. When a polybasic acid is used as the carboxylic acid component, the ester may be a complete ester in which all carboxyl groups in the polybasic acid are esterified, and a part of the carboxyl group is not esterified. It may be a partial ester remaining as a carboxyl group.

  As the ester oily agent, any of the above can be used, but from the viewpoint of excellent processability, (1b) an ester of a monohydric alcohol and a monobasic acid and (3b) a monohydric alcohol and a polybasic acid The esters are preferred. Particularly in aluminum fin processing and aluminum rolling, (1b) an ester of a monohydric alcohol and a monobasic acid is more preferable. In rolling metal other than aluminum, (1b) an ester of a monohydric alcohol and a monobasic acid is more preferable. The combination of (1b) an ester of a monohydric alcohol and a monobasic acid and (3b) an ester of a monohydric alcohol and a polybasic acid is most preferred.

  (1b) The total carbon number of the ester of monohydric alcohol and monobasic acid used as the oiliness agent is not particularly limited, but the total carbon number of the ester is preferably 7 or more and 9 or more from the viewpoint of improving processability. More preferably, 11 or more is most preferable. Further, from the viewpoint of oil agent removability, the total carbon number of the ester is preferably 26 or less, more preferably 24 or less, and most preferably 22 or less. Although there is no restriction | limiting in particular in carbon number of the said monohydric alcohol, C1-C10 is preferable, C1-C8 is more preferable, C1-C6 is still more preferable, C1-C4 is the most preferable. . Although there is no restriction | limiting in particular in carbon number of the said monobasic acid, C8-22 is preferable, C10-20 is more preferable, C12-18 is the most preferable. It is preferable to set the total carbon number, the carbon number of the alcohol, and the carbon number of the monobasic acid as described above. The upper limit value is likely to increase the occurrence of stain and corrosion, In consideration of the point that the fluidity is lost and the handling becomes difficult and the possibility that the solubility in the base oil is reduced and the precipitation is increased. This is because the working environment deteriorates due to odor.

The form of the ester of (3b) monohydric alcohol and polybasic acid used as the oiliness agent in the present invention is not particularly limited, but may be a diester represented by the following formula (3) or an ester of trimellitic acid. preferable.
R ¹ —O—CO (CH ₂ ) _n CO—O—R ² (3)
(In Formula (3), R ¹ and R ² are the same or different groups and represent a hydrocarbon group having 3 to 10 carbon atoms, and n represents 4 to 8).

R ¹ and R ² are preferably hydrocarbon groups having 3 or more carbon atoms in the above formula (3) from the viewpoint that the effect of improving the lubricating performance may not be expected or the working environment is deteriorated by odor. . In addition, there is a greater risk of increasing the occurrence of stains and corrosion, a greater risk of losing fluidity and difficulty in handling in winter, and a greater risk of precipitation due to a decrease in solubility in base oil. Therefore, in Formula (3), R ¹ and R ² are preferably hydrocarbon groups having 10 or less carbon atoms. In addition, there is a greater risk of increasing the occurrence of stains and corrosion, a greater risk of losing fluidity and difficulty in handling in winter, and a greater risk of precipitation due to a decrease in solubility in base oil. Therefore, n is preferably 8 or less. On the other hand, n is preferably 4 or more from the viewpoint that the effect of improving the lubrication performance may not be expected or the working environment is deteriorated by odor. Among these, n = 4 and 6 are particularly preferable from the viewpoint of availability of raw materials and price.

Examples of R ¹ and R ² of the diester include an alkyl group, an alkenyl group, an alkylcycloalkyl group, an alkylphenyl group, and a phenylalkyl group, and an alkyl group is particularly preferable. The alkyl group includes a linear alkyl group or a branched alkyl group, and a linear alkyl group and a branched alkyl group may be mixed, but a branched alkyl group is preferable. Examples of R ¹ and R ² include a linear or branched propyl group, a linear or branched butyl group, a linear or branched pentyl group, a linear or branched hexyl group, and a linear or branched heptyl group. A linear or branched octyl group, a linear or branched nonyl group, a linear or branched decyl group, and the like. The diester represented by the formula (3) can be obtained by any method. For example, a straight-chain saturated dicarboxylic acid having 6 to 10 carbon atoms (adipic acid, pimelic acid, corkic acid, azelaic acid in this order from 6 carbon atoms) , Sebacic acid) or a derivative thereof and an alcohol having 3 to 10 carbon atoms are exemplified. The carbon number of the monohydric alcohol for esterifying trimellitic acid is not particularly limited, but there is a greater risk of increasing the occurrence of stains and corrosion, and there is a greater risk of loss of fluidity and difficulty in handling in winter. From the point that the solubility in oil decreases and the risk of precipitation increases, the number of carbon atoms is preferably 1 to 10, more preferably 1 to 8 carbon atoms, still more preferably 1 to 6 carbon atoms, and more preferably 1 to 1 carbon atoms. 4 is most preferred. The ester of trimellitic acid may be a partial ester (monoester or diester) or a complete ester (triester).

  Examples of the monohydric alcohol of the component (B2) include the compounds listed as the alcohol constituting the ester in the description of the component (B1). As the monohydric alcohol, the total carbon number of the monohydric alcohol is preferably 6 or more, more preferably 8 or more, and most preferably 10 or more from the viewpoint of superior processability. Further, from the viewpoint of oil agent removability, the total carbon number of the monohydric alcohol is preferably 20 or less, more preferably 18 or less, and most preferably 16 or less.

  The carboxylic acid as component (B3) may be a monobasic acid or a polybasic acid. As such carboxylic acid, the compound illustrated as carboxylic acid which comprises ester in description of the said (B1) component is mentioned, for example. Among these, a monobasic acid is preferable from the viewpoint of superior processability. Moreover, from the point which is excellent in workability, 6 or more are preferable, as for the total carbon number of carboxylic acid, 8 or more are more preferable, and 10 or more are the most preferable. Further, from the viewpoint of oil agent removability, the total carbon number of the carboxylic acid is preferably 20 or less, more preferably 18 or less, and most preferably 16 or less.

  As the oily agent used in the lubricating oil composition for metalworking of the present invention, only one selected from the above-mentioned various oily agents may be used alone or as a mixture of two or more. (1) Esters having 7 to 26 carbon atoms in total obtained from monohydric alcohols and monobasic acids, (2) Monohydric alcohols having 6 to 20 carbon atoms, particularly monohydric alcohols having 9 or more carbon atoms And a monohydric alcohol having a carbon number of 8 or less, (3) a monobasic acid having 6 to 20 carbon atoms, or a mixture thereof.

  Moreover, content of an oiliness agent is 0.01-70 mass% on the basis of the whole quantity of the lubricating oil composition for metalworking of this invention. The content of the oily agent is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and further preferably 0.07% by mass or more from the viewpoint of processability. On the other hand, the upper limit of the content of the oily agent is 70% by mass or less, and preferably 50% by mass or less, more preferably 15% by mass or less, and further preferably 10% by mass or less from the viewpoint of oil agent removal. is there.

Alkylbenzene can be blended in the lubricating oil composition for metal working of the present invention, and in particular, a base oil having a low aromatic content, specifically, 5% by volume or less (more specifically, 1% by volume or less) of aromatics. When mineral oil or isoparaffin is used, the addition effect of the oiliness agent can be further increased by adding alkylbenzene. Kinematic viscosity at 40 ° C. of alkylbenzenes used in the present invention ranges from 1~60mm ² / s, when the kinematic viscosity at 40 ° C. of less than ^{1 mm} 2 / s, there is a case where the effect of addition can not be expected, 40 When the kinematic viscosity at 60 ° C. exceeds 60 mm ² / s, there is a possibility of increasing the occurrence of stains and corrosion, preferably 40 mm ² / s or less, more preferably 20 mm ² / s or less.

Further, the alkyl group bonded to the benzene ring of the alkylbenzene used in the present invention may be linear or branched, and the carbon number is not particularly limited, A C1-C40 alkyl group is preferable.
Specific examples of the alkyl group having 1 to 40 carbon atoms include a methyl group, an ethyl group, a linear or branched propyl group, a linear or branched butyl group, a linear or branched group. A branched pentyl group, a linear or branched hexyl group, a linear or branched heptyl group, a linear or branched octyl group, a linear or branched nonyl group, Linear or branched decyl group, linear or branched undecyl group, linear or branched dodecyl group, linear or branched tridecyl group, linear or branched Tetradecyl group, linear or branched pentadecyl group, linear or branched hexadecyl group, linear or branched heptadecyl group, linear or branched octadecyl group, straight Chain or branched nonadecyl group, linear or branched icosyl Linear or branched heicosyl group, linear or branched docosyl group, linear or branched tricosyl group, linear or branched tetracosyl group, linear or branched A branched pentacosyl group, a linear or branched hexacosyl group, a linear or branched heptacosyl group, a linear or branched octacosyl group, a linear or branched nonacosyl group, Linear or branched triacontyl group, linear or branched hentriacontyl group, linear or branched dotriacontyl group, linear or branched tritriacontyl group, linear Linear or branched tetratriacontyl group, linear or branched pentatriacontyl group, linear or branched hexatriacontyl group, linear or branched heptatria Contyl group, straight chain The branched oct triacontyl group, straight or branched nonadecyl triacontyl group include linear or branched tetracontyl group.

  The number of alkyl groups in the alkylbenzene is usually 1 to 4, but from the viewpoint of stability and availability, alkylbenzene having 1 or 2 alkyl groups, that is, monoalkylbenzene, dialkylbenzene, or a mixture thereof is used. Most preferably used. Of course, the alkylbenzene to be used may be not only a single structure alkylbenzene but also a mixture of alkylbenzenes having different structures.

  The number average molecular weight of the alkylbenzene according to the present invention is not limited at all, but is preferably 100 or more and more preferably 130 or more from the viewpoint of the effect of addition. Further, if the molecular weight is too large, the possibility of increasing the occurrence of stain or corrosion increases, so the upper limit of the number average molecular weight is preferably 340 or less, more preferably 320 or less.

  The lubricating oil composition for metal working of the present invention can contain 0.1 to 50% by mass of the above-described alkylbenzene based on the total amount of the composition. The lower limit of the content is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and further preferably 1% by mass or more from the viewpoint of the effect of addition. Moreover, since possibility that the generation | occurrence | production of a stain and corrosion will increase when there is too much content, upper limit is preferable 50 mass% or less, More preferably, it is 40 mass% or less, More preferably, it is 30 mass% or less. is there.

The lubricating oil composition for metal working of the present invention may further contain a linear olefin having 6 to 40 carbon atoms. When the lubricating oil composition contains a linear olefin, the lubricity is further improved.
Straight chain olefins having less than 6 carbon atoms are not suitable because of their low flash point. In order to have an appropriate flash point, the number of carbon atoms is preferably 8 or more, more preferably 10 or more, and even more preferably 12 or more. On the other hand, when the number of carbon atoms exceeds 40, it is difficult to use because it is in a solid state, and it is not suitable because it is difficult to mix and dissolve with other components (mineral oil and additives). Moreover, linear olefins having more than 40 carbon atoms are not common and are difficult to obtain. In view of such inconvenience, a linear olefin having 30 or less carbon atoms is preferable.

Such a linear olefin may have one double bond or two or more in the molecule, but has one double bond. What is doing is preferable. The position of the double bond is not particularly limited, but is preferably a linear olefin having a double bond at the terminal, that is, an n-α-olefin, from the viewpoint of excellent lubricity.
Examples of the linear olefin include 1-octene, 1-decene, 1-docosene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-icocene or a mixture of two or more thereof. In addition, although what is obtained by various manufacturing methods can be used as a linear olefin, For example, the ethylene oligomer obtained by superposing | polymerizing ethylene by a normal means can be used. Moreover, as a linear olefin, you may use these compounds individually or in mixture of 2 or more types.

  The content of the linear olefin is arbitrary, but from the viewpoint of improving the lubricity of the lubricating oil composition for metal working of the present invention, the content is 1% by mass or more based on the total amount of the lubricating oil composition. Preferably, 3 mass% or more is more preferable, and 5 mass% or more is still more preferable. On the other hand, the content is preferably 30% by mass or less, more preferably 25% by mass or less, and still more preferably 20% by mass or less, based on the total amount of the lubricating oil composition from the viewpoint of obtaining an effect commensurate with the addition amount. .

In the lubricating oil composition for metal working of the present invention, in order to further improve the excellent effect, an extreme pressure additive, an antioxidant, a rust inhibitor, a corrosion inhibitor, an antifoaming agent, an anti-foaming agent, as necessary. Additives such as emulsifiers and fungicides can be further contained alone or in combination of two or more.
Examples of extreme pressure additives include phosphorus compounds such as tricresyl phosphate, and organometallic compounds such as zinc dialkyldithiophosphate. Examples of the antioxidant include phenolic compounds such as 2,6-ditertiary butyl-p-cresol (DBPC), aromatic amines such as phenyl-α-naphthylamine, and organometallic compounds such as zinc dialkyldithiophosphate. Examples of rust inhibitors include salts of fatty acids such as oleic acid, sulfonates such as dinonylnaphthalene sulfonate, partial esters of polyhydric alcohols such as sorbitan monooleate, amines and derivatives thereof, phosphate esters and derivatives thereof. It is done. Examples of the corrosion inhibitor include benzotriazole. Examples of antifoaming agents include silicone-based ones. Surfactant is used as demulsifier, quaternary ammonium salt, imidazoline type as cationic system, sulfated oil, aerosol type as anionic system, ethylene oxide adduct of castor oil as nonionic system, phosphorus of ether type nonionic active agent Examples thereof include acid esters, block copolymers of ethylene oxide and propylene oxide, and esters with dimer acid. Examples of mold inhibitors include phenol compounds, formaldehyde donor compounds, salicylanilide compounds, and the like.
The total content of the additives is usually 15% by mass or less, preferably 10% by mass or less, based on the total amount of the lubricating oil composition for metal working of the present invention.

  In principle, the lubricating oil composition for metalworking of the present invention (hereinafter also referred to as the composition of the present invention) should be used in a water-free state that does not substantially contain water except for the natural moisture absorption during storage. In some cases, it may further contain water, and the composition of the present invention may be used in combination with water. When water is contained, the composition of the present invention comprises water in a continuous layer in which an oil component is finely dispersed to form an emulsion, a solubilized state in which water is dissolved in the oil component, or strong. Any form of a suspension in which water and an oil are mixed by stirring can be used. Further, the composition of the present invention and water can be separately supplied to the processing site for use. By simply diluting the composition of the present invention (stock solution) with water or using it together with water, it can be used as a metalworking fluid for actual use. The dilution ratio (when used in combination, the ratio of the stock solution + water to the stock solution is the dilution factor) is arbitrarily selected depending on the use conditions, but generally the stock solution is 2 to 100 times by weight, preferably 3 It is customary to obtain practical metalworking fluids by diluting up to 70 times with water. In this case, tap water, industrial water, ion exchange water, distilled water, etc. can be used as the dilution water, and it does not matter whether it is hard water or soft water. In the case of the emulsion type, when the composition of the present invention is diluted with water, an emulsion in which the oil component is finely dispersed in water as a continuous phase is obtained, but the average particle size of oil droplets dispersed in water is It is preferably 300 nm or less, particularly 100 nm or less. This is because if the average particle size of the dispersed oil droplets is large, oil pits are easily generated and the surface gloss of the processed product is impaired, and a fine filter cannot be used for cleaning the metalworking fluid.

The viscosity of the lubricating oil composition for metal working of the present invention is not particularly limited, but the kinematic viscosity at 40 ° C. is 0.5 to 500 mm ² / s, preferably 1.0 to ²⁰⁰ mm ² / s. In aluminum fin processing, from the viewpoint of processability, oil volatility, and oil removability, it is preferably 1.0 to 5.0 mm ² / s, more preferably 1.2 to 3.0 mm ² / s, most preferably. Is 1.3 to 2.8 mm ² / s. In the aluminum rolling, in view of lubricity and surface quality, and preferably from 1.0 to 10 mm ² / s, more preferably 1.0~8.0mm ² / s. In the rolling process of metals other than aluminum, it is preferably 1.0 to ²⁰ mm ² / s, more preferably 2.0 to 15 mm ² / s, and most preferably 3.0 to 15 mm ² / s.

  The lubricating oil composition for metal working of the present invention is used as a processing oil for various metals, and the applied metals include aluminum, magnesium, and transitions of copper, iron, chromium, nickel, zinc, tin, titanium, etc. Mention may be made of metals as well as their alloys. Examples of applicable processing methods include cold, warm and hot rolling, pressing, punching, ironing, drawing, drawing, forging, metal processing such as cutting and grinding, including micro-trace cutting (MQL), etc. Can do. The lubricating oil composition for metal processing of the present invention is particularly suitable for processing aluminum fin materials (flat pure aluminum (purity 99% or more) or alloys containing aluminum as a main component), cold and warm of various metals. And suitable for cold rolling. Among these rolling methods, it is particularly suitable for cold rolling. Among various metal rolling, high purity aluminum (purity 99.9% or more (including those having a purity of 99.99% or more)) and alloys mainly composed of aluminum, stainless steel, copper and copper alloys Suitable for rolling, and most preferred is rolling of high-purity aluminum and aluminum-based alloys.

In the processing of the aluminum fin material, the lubricating oil composition for metal processing of the present invention can be used not only for a pre-coating material in which the surface of the aluminum fin material is pre-coated, but also for a material that has not been subjected to such processing. .
Here, the term “film” refers to a film comprising a corrosion-resistant base film formed on an aluminum fin material and a hydrophilic film formed on the film. Examples of the corrosion resistant undercoat include inorganic undercoat and organic undercoat. Examples of the inorganic base coating include a chromate coating, a boehmite coating, a silicate coating, or a combination of these. Examples of the organic base coating include vinyl resins such as polyvinyl chloride-vinyl acetate, polyethylene, and polypropylene, acrylic resins, epoxy resins, urethane resins, styrene resins, phenol resins, and fluorine resins. And silicon resins, diallyl phthalate resins, polycarbonate resins, polyamide resins, alkyd resins, polyester resins, urea melamine resins, polyacetal resins and fiber resins.

Examples of the hydrophilic film include the following (a) to (e).
(A) A main component composed of a low molecular organic compound having a carbonyl group and an alkali silicate (b) Special water glass composed mainly of a component obtained by adding a water-soluble organic polymer compound to (a) above c) Silicates such as sodium silicate, potassium silicate, water glass, silicic acid, silica gel, or alumina sol (d) A crosslinking agent made of a low molecular weight organic compound having a carbonyl group is reacted with a hydrophilic organic polymer. (E) a polyvinyl alcohol-based hydrophilic organic polymer, a water-soluble organic polymer, and a hydrophilic polyvinyl alcohol-modified organic polymer obtained by reacting a crosslinking agent. As processing of the aluminum fin material, for example, overhang processing, drawing processing, punching processing, curling processing, and around the tube insertion hole Ironing to increase squeezes the cylindrical rising wall and the like.

  As described above, the lubricating oil composition for metal working of the present invention can withstand high productivity and has high workability even under severe lubrication conditions, while maintaining good oil agent removability, It has excellent characteristics that it suppresses deterioration of product quality and does not increase oil cost.

  Hereinafter, the preferred embodiments of the present invention will be described in more detail, but the present invention is not limited to these embodiments.

<Examples 1-18 and Comparative Examples 1-6>
In Examples 1 to 18 and Comparative Examples 1 to 6, a lubricating oil composition for metalworking was prepared using each component shown below, and was used for processing an aluminum fin material (the numerical unit of each component is the composition) It represents mass% based on the total amount). Table 1 shows the content of each component of the lubricating oil for metal working of each example or comparative example.

(1) Base oil Base oil 1: 0.5 vol% aromatic content, 45 vol% naphthene content, 54.5 vol% paraffin content, initial boiling point 207 ° C, end point 288 ° C, kinematic viscosity (40 ° C) Mineral oil at 60 mm ² / s Base oil 2: Isoparaffin with initial boiling point 161 ° C., end point 263 ° C., kinematic viscosity (40 ° C.) 2.45 mm ² / s

(2) Epoxy compound Epoxy compound 1: Nonylphenyl glycidyl ether Epoxy compound 2: 2-ethylhexyl glycidyl ether Epoxy compound 3: Glycidyl-2,2-dimethyloctanoate Epoxy compound 4: 1,2-epoxystyrene Epoxy compound 5: 1,2-epoxydodecane epoxy compound 6: 1,2-epoxycyclopentane epoxy compound 7: hexyl epoxy stearate epoxy compound 8: epoxidized soybean

(3) Comparative additive Comparative additive 1: Butyl laurate Comparative additive 2: Lauryl alcohol

The following evaluation tests were performed on the lubricating oils of Examples 1 to 18 and Comparative Examples 1 to 6.
(Lubricity test)
Each lubricating oil of Examples 1 to 18 and Comparative Examples 1 to 6 is applied to both sides of an aluminum plate (material: A1050 material) having a length of 300 mm, a width of 30 mm, and a thickness of 0.8 mm, and a metal block having a flat portion The material was sandwiched between (material: SKD11) and a metal block (material: SKD11) having a flat portion, and the force when pulling the aluminum plate in one direction under the following conditions was measured. The results were expressed by converting the pulling force into a friction coefficient.
Drawing condition How to hold the block: 980N (100kgf)
Drawing speed: 100 mm / min

(Volatility test)
A test piece of aluminum material washed with a solvent was allowed to stand in a thermostatic chamber at 145 ° C. for 3 minutes, and then the weight of the test piece was weighed. This was designated as A (g). Subsequently, after cooling this test piece to room temperature within a desiccator, each lubricating oil of Examples 1-18 and Comparative Examples 1-6 was apply | coated to the test piece so that it might become ² g / cm <2>. The weights of the test pieces before and after coating were weighed to be B (g) and C (g), respectively. The test piece was allowed to stand in a thermostatic bath at 130 ° C. for 3 minutes, and immediately thereafter, the weight of the test piece was weighed to obtain D (g). The volatilization amount of each lubricating oil was determined from the values of A, B, C and D according to the following formula.
Volatilization amount (% by mass) = 100 × (D−A) / (C−B)

(Storage stability 1)
The lubricating oils of Examples 1 to 18 and Comparative Examples 1 to 6 were put in a 100 cc candle bottle, and kept stationary in a room at 22 ° C. (room temperature), and the state after one month was observed.
As evaluation, transparency is (circle), cloudiness is (triangle | delta), and precipitation is x.
(Storage stability 2)
The lubricating oils of Examples 1 to 18 and Comparative Examples 1 to 6 were put in a 100 cc candle bottle, stored in a constant temperature bath at 0 ° C., and the state after one month was observed.
As evaluation, transparency is (circle), cloudiness is (triangle | delta), and precipitation is x.

  The evaluation results are also shown in Table 1, but the lubricity is poor when no epoxy compound is contained.

<Examples 19 to 33 and Comparative Examples 7 to 15>
In Examples 19 to 33 and Comparative Examples 7 to 15, metal processing lubricants were prepared using the components shown below, and a rolling test was performed on each material (the numerical unit of each component is based on the total amount of the composition). Mass%). Table 2 shows the content of each component of the lubricating oil for metal working of each Example and Comparative Example.

(1) Base oil Base oil 3: Mineral oil with a kinematic viscosity of 2.3 mm ² / s at 40 ° C. (paraffin 35 vol%, naphthene 64.5 vol%, aromatic 0.5 vol%)
Base oil 4: Mineral oil with a kinematic viscosity of 6.9 mm ² / s at 40 ° C. (paraffin 48 volume%, naphthene 50 volume%, aromatic 2 volume%)
(2) Oiliness agent Oiliness agent 1: Lauryl alcohol Oiliness agent 2: Butyl stearate
Oily agent 3: Diisononyl adipate (3) Epoxy compound Epoxy compound 9: i-Butylphenyl glycidyl ether Epoxy compound 10: Octyl glycidyl ether Epoxy compound 11: Glycidyl-t-butylbenzoate Epoxy compound 4: 1,2-epoxystyrene Epoxy Compound 5: 1,2-epoxydodecane Epoxy compound 12: 1,2-epoxycyclohexane (4) Oxygenated compound Oxygenated compound 1: 1,2-dodecanediol Oxygenated compound 2: Tripropylene glycol

The materials, rolling conditions and evaluation methods used for the rolling test are as follows.
(1) Material Material 1: Aluminum JIS A1050 0.33 mm thickness, 60 mm width Material 2: Aluminum JIS A5182 0.33 mm thickness, 60 mm width Material 3: Stainless steel SUS304 0.33 mm thickness, 60 mm width Material 4: Copper 0.33 mm Thickness, 60 mm width Material 5: 7/3 brass (70% copper, 30% zinc) 0.33 mm thickness, 60 mm width (2) Rolling conditions Work roll diameter: 51 mm
Rolling speed: 35 m / min, 380 m / min
Rolling distance: 420m

(3) Evaluation method (rolling limit rolling reduction)
Rolling was performed at a rolling speed of 35 m / min using the above oil agent, and the rolling reduction rate was gradually increased from 30% to obtain the maximum rolling reduction rate that can be normally rolled without surface damage such as seizure.
(Glossy unevenness)
Using the above oil 10L, rolling is performed for 1 minute and 40 seconds at a rolling speed of 400 m / min and a reduction rate of 18%, and a sample length of 400 m is sampled from the start of rolling, and a gloss value is obtained at regular intervals of 5 points in the width direction. Was measured, and the standard deviation was obtained.

(Amount of wear powder generated)
The oil used after the gloss unevenness test was filtered through a 0.1 μ filter, and the captured wear powder was dissolved with an acid, and the amount was determined by atomic absorption. Further, after wiping off the surface of the rolled material, the aluminum trapped by the absorbent cotton was dissolved in an acid and quantified by atomic absorption spectrometry. The pressing jig for absorbent cotton was fixed with two tightening screws with a torque of 0.4 Nm so that a constant force was always applied to the material surface. The total of the above-mentioned wear powder in oil and the wear powder adhering to the material was converted to the amount per 1 m ² of the material and used as the amount of generated wear powder. For each material, the following elements were measured as wear powder.
Material 1 and 2: Aluminum Material 3: Iron Material 4 and 5: Copper

(Annealing (Aluminum materials 1 and 2 only))
The coil after the uneven gloss test (from the start of rolling to 400 m) was annealed at 350 ° C., and the presence or absence of oil stain was evaluated.
○: No stain △: Very slight stain occurrence ×: Stain occurrence ××: Significant stain occurrence

  The evaluation results are also shown in Table 2, and when an epoxy compound is added, satisfactory results are obtained in all of the rolling limit%, the unevenness of gloss, the amount of wear powder, and the occurrence of stain as compared with the comparative example. On the other hand, when no epoxy compound is added, there are disadvantages such as low rolling limit or high wear (Comparative Examples 7, 12, 14), high gloss unevenness and high wear (Comparative Example 8). Moreover, when there is too much addition amount of an epoxy compound, glossiness unevenness is bad and there are also many stains (comparative example 10).

Claims (2)

Mineral oil kinematic viscosity at 40 ° C. is not more than 1.2 mm 2 / ^s or more 4.8 mm 2 / ^s, the phenyl glycidyl ether-type epoxy compounds, alkyl glycidyl ether-type epoxy compounds, aryl oxirane compounds and alicyclic epoxy compounds A lubricating oil composition for metal working comprising an epoxy compound selected from 0.01 to 10.0% by mass based on the total amount of the composition. The lubricating oil composition for metal working according to claim 1, which is used for processing an aluminum fin material.