Water-soluble metalworking oil and metalworking method

Abstract

The present invention relates to a water-soluble metalworking oil and a metalworking method comprising using the oil to work a metal workpiece. The water-soluble metalworking oil of the present invention comprises (A) a carboxylic acid having 8 to 18 carbon atoms; (B) at least one selected from the group consisting of an alkylene oxide adduct of a polyhydric alcohol, a polymerized fatty acid, and a polyalkylene glycol; (C) an amine compound including a trialkanolamine and a cyclohexyldialkanolamine; and (D) water. According to a preferred embodiment of the present invention, a water-soluble metalworking oil and a metalworking method can be provided that are excellent in at least one of workability, stock solution stability, rust prevention, corrosion resistance, metal tarnish prevention, and wettability.

Description

[Technical Field]

[0001] The present invention relates to a water-soluble metalworking oil and a method for producing the same, a water-soluble metalworking fluid, and a metalworking method. [Background technology]

[0002] High workability is required when plastically processing metal materials such as aluminum and copper plates. Specifically, it is necessary to be able to process with high dimensional accuracy according to the product design, to be able to process at high speeds to improve productivity, to ensure that metal distortion during processing does not adversely affect the performance of the processed product, and to minimize tool wear so that the tools can be used for a long period of time. For this reason, lubricants (metalworking oils) are often used when plastically processing metal materials. Conventionally, oil-based metalworking fluids have been used as metalworking fluids, but in recent years, water-soluble metalworking fluids have been widely used because they have excellent cooling and wetting properties, no risk of fire due to high-temperature drying, and have a low environmental impact (e.g., Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-209246 [Patent Document 2] International Publication No. 2014 / 157572 Summary of the Invention [Problem to be solved by the invention]

[0004] Although these water-soluble metalworking fluids have excellent effects, there is still room for improvement in terms of processability (low coefficient of friction). Under these circumstances, there is a need for a water-soluble metalworking fluid that is excellent in processability, as well as in undiluted solution stability, rust prevention, corrosion resistance, metal discoloration prevention, wettability, etc. [Means for solving the problem]

[0005] The present invention relates to the following water-soluble metalworking oil and its manufacturing method, water-soluble metalworking fluid and metalworking method, etc. [1] (A) Carboxylic acid having 8 to 18 carbon atoms; (B) at least one selected from the group consisting of alkylene oxide adducts of polyhydric alcohols, polymerized fatty acids, and polyalkylene glycols; (C) amine compounds including trialkanolamines and cyclohexyldialkanolamines; and (D)Water A water-soluble metalworking fluid comprising: [2] The water-soluble metalworking oil according to [1], wherein the total content of the component (B) relative to the content of the component (A) is 0.1 to 20 in terms of mass ratio. [3] The water-soluble metalworking oil according to [1] or [2], wherein the total content of the component (C) relative to the content of the component (A) is 1 to 3 in mass ratio. [4] The water-soluble metalworking fluid according to any one of [1] to [3], wherein the content of the component (D) is 20 to 50 mass% based on the total amount of the water-soluble metalworking fluid. [5] The water-soluble metalworking fluid according to any one of [1] to [4], wherein the component (B) comprises an alkylene oxide adduct of a polyhydric alcohol, a polymerized fatty acid, and a polyalkylene glycol. [6] The water-soluble metalworking fluid according to any one of [1] to [5], further comprising (E) at least one selected from the group consisting of acidic phosphate esters and phosphites. [7] The water-soluble metalworking oil according to [6], wherein the total content of the component (E) relative to the content of the component (A) is 0.1 to 10 in terms of mass ratio. [8] (F) The water-soluble metalworking oil according to any one of [1] to [7], further comprising a glycol. [9] The water-soluble metalworking fluid according to [8], wherein the total content of the component (F) is 0.01 to 10% by mass relative to the content of the component (A).

[10] (G) The water-soluble metalworking oil according to any one of [1] to [9], further comprising an anti-corrosion agent.

[11] (H) The water-soluble metalworking oil according to any one of [1] to

[10] , further comprising a preservative.

[12] The water-soluble metalworking oil according to any one of [1] to

[11] , which is for machining aluminum.

[13] (A) Carboxylic acid having 8 to 18 carbon atoms; (B) at least one selected from the group consisting of alkylene oxide adducts of polyhydric alcohols, polymerized fatty acids, and polyalkylene glycols; (C) amine compounds including trialkanolamines and cyclohexyldialkanolamines; and (D)Water A method for producing a water-soluble metalworking fluid, comprising mixing the above.

[14] A water-soluble metalworking fluid comprising the water-soluble metalworking oil according to any one of [1] to

[12] and water in an amount of 2 to 300 times by volume the water-soluble metalworking oil.

[15] A metalworking method comprising processing a workpiece made of metal using the water-soluble metalworking oil according to any one of [1] to

[12] .

[16] A metalworking method, comprising processing a workpiece made of metal using the water-soluble metalworking fluid according to

[14] . [Effects of the Invention]

[0006] The present invention provides a water-soluble metalworking oil agent to be used when plastically working metal materials, and a water-soluble metalworking fluid obtained by diluting the same. The water-soluble metalworking oil and water-soluble metalworking fluid of the present invention are excellent in processability and in one or more of stock solution stability, rust prevention, putrefaction resistance, metal discoloration prevention, and wettability, and therefore can be suitably used for the plastic working of metal materials. According to a preferred embodiment of the present invention, the water-soluble metalworking oil and water-soluble metalworking fluid of the present invention can be suitably used for the plastic working of aluminum, particularly aluminum fin stock. DETAILED DESCRIPTION OF THE INVENTION

[0007] Hereinafter, embodiments of the present invention will be described in detail.

[0008] 1. Water-soluble metalworking oil The water-soluble metalworking fluid of the present invention is characterized by containing (A) a carboxylic acid having 8 to 18 carbon atoms; (B) at least one member selected from the group consisting of an alkylene oxide adduct of a polyhydric alcohol, a polymerized fatty acid, and a polyalkylene glycol; (C) an amine compound including a trialkanolamine and a cyclohexyldialkanolamine; and (D) water. Each component will be described in detail below.

[0009] (A) Carboxylic acid having 8 to 18 carbon atoms The carboxylic acid having 8 to 18 carbon atoms used in the present invention is preferably a fatty acid, and may be a saturated or unsaturated fatty acid. Furthermore, the fatty acid used here is not limited to one with a straight-chain structure, but also includes branched isomers. By using a carboxylic acid having 8 to 18 carbon atoms, the water solubility and wettability of the water-soluble metalworking fluid can be improved, and the stability of the undiluted solution can be enhanced. The number of carboxyl groups in the carboxylic acid is not particularly limited, and the carboxylic acid may be a monocarboxylic acid or a polycarboxylic acid. From the viewpoint of ease of handling, the number is preferably 1 to 6, more preferably 1 to 4, and even more preferably 1 to 2, i.e., a monocarboxylic acid or a dicarboxylic acid. Specific examples of carboxylic acids that can be used in the present invention include, but are not limited to, monocarboxylic acids such as octanoic acid (caprylic acid), 2-ethylhexanoic acid, isooctanoic acid, nonanoic acid (pelargonic acid), isononanoic acid, decanoic acid (capric acid), isodecanoic acid, neodecanoic acid, undecanoic acid, isoundecanoic acid, dodecanoic acid (lauric acid), isododecanoic acid, tridecanoic acid, isotridecanoic acid, tetradecanoic acid (myristic acid), hexadecanoic acid (palmitic acid), heptadecanoic acid (margaric acid), octadecanoic acid (stearic acid), isostearic acid, 10-undecenoic acid, zomalic acid, oleic acid, elaidic acid, linoleic acid, and linolenic acid; Dicarboxylic acids such as nonanedioic acid, undecanedioic acid, sebacic acid (decanedioic acid), and dodecanedioic acid; Examples include soybean oil fatty acids, coconut oil fatty acids, and tall oil fatty acids (C18) extracted from oils and fats.

[0010] Among these, from the viewpoints of antifoaming property, rust prevention, and hard water stability when the present oil agent is diluted with water for use, carboxylic acids having 8 to 16 carbon atoms are preferred, carboxylic acids having 8 to 14 carbon atoms are more preferred, and carboxylic acids having 10 to 12 carbon atoms are even more preferred. In particular, saturated fatty acids having 10 to 12 carbon atoms are more preferred, and lauric acid, decanoic acid, neodecanoic acid (a mixture of octanoic acid, nonanoic acid, and decanoic acid), undecanedioic acid, sebacic acid, and dodecanedioic acid are even more preferred, with lauric acid, neodecanoic acid, sebacic acid, and dodecanedioic acid being particularly preferred. These carboxylic acids may be used alone or in combination of two or more.

[0011] In the water-soluble metalworking oil of the present invention, the content of (A) the carboxylic acid having 8 to 18 carbon atoms is preferably in the range of 1 to 30 mass%, more preferably 2.5 to 25 mass%, and even more preferably 5 to 20 mass%, based on the total amount of the water-soluble metalworking oil, from the viewpoint of improving wettability.

[0012] (B) at least one member selected from the group consisting of alkylene oxide adducts of polyhydric alcohols, polymerized fatty acids, and polyalkylene glycols; The water-soluble metalworking fluid of the present invention contains at least one component selected from the group consisting of an alkylene oxide adduct of a polyhydric alcohol, a polymerized fatty acid, and a polyalkylene glycol. By containing these components, the water-soluble metalworking fluid of the present invention can have excellent processability (low coefficient of friction).

[0013] (B-1) Alkylene oxide adduct of polyhydric alcohol The alkylene oxide adduct of polyhydric alcohol used in the present invention is not particularly limited as long as it is an adduct of an alkylene oxide to a polyhydric alcohol.

[0014] Specific examples of polyhydric alcohols include ethylene glycol, propylene glycol, glycerin, diglycerin, triglycerin, trimethylolalkanes (e.g., trimethylolethane, trimethylolpropane, trimethylolbutane), dimers and trimers thereof, pentaerythritol, sorbitol, sorbitan, etc. Among these, monohydric to hexahydric, further dihydric to pentahydric, and particularly trihydric and tetrahydric polyhydric alcohols are preferred, with pentaerythritol and trimethylolpropane being particularly preferred, and pentaerythritol being more preferred.

[0015] When producing an alkylene oxide adduct of a polyhydric alcohol, the polyhydric alcohol may be used as is, or a compound having an ester group obtained by reacting some of its hydroxyl groups with a fatty acid may be used. The fatty acid may be linear, branched, or cyclic, and may be saturated or unsaturated. The number of carbon atoms in the fatty acid is preferably 2 to 24, more preferably 4 to 20. Specific examples include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, and isostearic acid.

[0016] Preferred alkylene oxides include ethylene oxide and propylene oxide, with ethylene oxide being particularly preferred. Although alkylene oxide may be added to only some of the hydroxyl groups, it is preferable to add alkylene oxide to all of the hydroxyl groups from the viewpoint of effectiveness. The alkylene oxide moieties may be added in a random or block manner.

[0017] The alkylene oxide adduct of polyhydric alcohol used in the present invention is preferably at least one of compounds of the following formula (1) to (4): [ka]

[0018] [ka]

[0019] [ka]

[0020] [ka]

[0021] In the above formula (1), R 11 , R 12 , R 13 and R 14 are each independently an alkylene group having 1 to 5 carbon atoms. e, f, g, and h are each independently an integer of 1 to 30. In the above formula (2), R 4 is an alkyl group having 1 to 30 carbon atoms. 21 , R 22 and R 23 are each independently an alkylene group having 1 to 5 carbon atoms. i, j, and k are each independently an integer of 1 to 30. In the above formula (3), R 5 and R 6 R are each independently an alkyl group having 1 to 30 carbon atoms. 31 and R 32 are each independently an alkylene group having 1 to 5 carbon atoms. l and m are each independently an integer of 1 to 30. In the above formula (4), R 7 , R 8 and R 9 R are each independently an alkyl group having 1 to 30 carbon atoms. 41 is an alkylene group having 1 to 5 carbon atoms, and n is an integer of 1 to 30. In the above formula, EO means an ethylene oxide unit.

[0022] Among these, from the viewpoint of improving abrasion resistance, an EO adduct of pentaerythritol or an EO adduct of trimethylolpropane is more preferred.

[0023] (B-2) Polymerized fatty acids The polymerized fatty acid used in the present invention includes a polymer of fatty acid, a polycondensed fatty acid (1) obtained by dehydration polycondensation of a hydroxycarboxylic acid, and a polycondensed fatty acid (2) obtained by dehydration polycondensation of an alcoholic hydroxyl group of the polycondensed fatty acid (1) with a monocarboxylic acid. As the fatty acid multimer, monomers to dodecamers of the fatty acids exemplified as component (A) are preferred, dimers to decamers are more preferred, and tetramers to octamers are even more preferred. Examples of hydroxycarboxylic acids include ricinoleic acid (ricinoleic acid) and 12-hydroxystearic acid. When the hydroxycarboxylic acid is heated to, for example, about 200°C in an inert atmosphere, dehydration polycondensation begins, and polycondensed fatty acid (1) is obtained. For example, mono- to dodeca-mers of hydroxy fatty acids are preferred, di- to decamers are more preferred, and tetra- to octa-mers are even more preferred. The degree of polycondensation of hydroxycarboxylic acids can be adjusted by the reaction time. As the reaction time increases, the acid value and hydroxyl value decrease, resulting in a fatty acid with a higher degree of polycondensation. The higher the degree of polycondensation, the higher the characteristic temperature of the resulting polycondensed fatty acid. Polycondensed fatty acid (2) can be obtained by adding a monocarboxylic acid to a dehydration polycondensate of hydroxycarboxylic acid and carrying out dehydration polycondensation. The progress of the reaction is confirmed by a decrease in the hydroxyl value. This reaction can produce a polycondensed fatty acid with a higher characteristic temperature. The monocarboxylic acid used in this reaction may be saturated or unsaturated, but carboxylic acids with four or more carbon atoms are preferred because unreacted carboxylic acids with fewer carbon atoms may cause unpleasant odors or metal corrosion. Examples of saturated carboxylic acids include caproic acid, enanthic acid, caprylic acid, 2-ethylhexanoic acid, pelargonic acid, isononanoic acid, capric acid, neodecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, and lignoceric acid. Examples of unsaturated carboxylic acids include undecylenic acid, oleic acid, elaidic acid, erucic acid, nervonic acid, linoleic acid, γ-linolenic acid, arachidonic acid, α-linolenic acid, stearidonic acid, eicosapentaenoic acid, and docosahexaenoic acid.

[0024] The acid value of the polymerized fatty acid is not particularly limited, but from the viewpoint of processability, it is preferably 60 mgKOH / g or less, more preferably 50 mgKOH / g or less, and even more preferably 40 mgKOH / g or less. The hydroxyl value of the polymerized fatty acid is not particularly limited, but from the viewpoint of processability, it is preferably 50 mgKOH / g or less, more preferably 35 mgKOH / g or less, and even more preferably 20 mgKOH / g or less. The weight average molecular weight (Mw) of the polymerized fatty acid is preferably from 1,000 to 3,000, more preferably from 1,500 to 2,500, even more preferably from 1,600 to 2,300, and particularly preferably from 1,700 to 2,200, from the viewpoint of processability. The acid value of the polymerized fatty acid is a value measured based on JIS K2501:2003, and the hydroxyl value is a value measured based on JIS K0070:1992. In this specification, the weight average molecular weight (Mw) is a value obtained using polystyrene as a calibration curve, and is specifically measured under the following conditions. Apparatus: Agilent 1260 HPLC Column: Shodex LF404 x 2 Solvent: Chloroform Temperature: 35℃ Sample concentration: 0.05% Calibration curve: Polystyrene Detector: Differential refractive index detector

[0025] (B-3) Polyalkylene glycol The polyalkylene glycol used in the present invention is not particularly limited as long as it is a polymer of alkylene glycol, but preferred examples include at least one polyalkylene glycol represented by the following formula (5). R 1 O-(R'O) p -H (5)

[0026] In equation (5), R 1 is a hydrogen atom or an alkyl group having 1 to 30 carbon atoms. The alkyl group preferably has 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, and even more preferably 1 to 5 carbon atoms. R 1 When the number of carbon atoms is within this range, the water solubility is good, which is preferable. R'O is an oxide unit selected from PO and EO, and they may be used in combination. However, from the viewpoint of defoaming properties when diluted with water, the molar fraction of EO to PO (EO / PO) in R'O is preferably less than 1, more preferably less than 0.8, and even more preferably less than 0.6. From the viewpoint of handleability, p is preferably an integer of 1 to 200, more preferably an integer of 5 to 150, still more preferably an integer of 10 to 100, and particularly preferably an integer of 30 to 60.

[0027] The weight-average molecular weight of the polyalkylene glycol is preferably 500 to 10000, more preferably 1000 to 5000, and even more preferably 1500 to 3000. When the weight-average molecular weight is within the above range, the wettability when diluted with water is good.

[0028] The polyalkylene glycols may be used alone or in combination, and polyalkylene glycols having various structures, such as different numbers of EO or PO structure units, may be used in combination.

[0029] In the present invention, component (B) is at least one selected from the group consisting of alkylene oxide adducts of polyhydric alcohols, polymerized fatty acids, and polyalkylene glycols, which may be used alone or in combination of two or more. According to a preferred embodiment of the present invention, by using a combination of an alkylene oxide adduct of a polyhydric alcohol, a polymerized fatty acid, and a polyalkylene glycol as component (B), a water-soluble metalworking oil having a low coefficient of friction and excellent processability can be obtained.

[0030] When an alkylene oxide adduct of a polyhydric alcohol (B-1) is used, the content of the alkylene oxide adduct of a polyhydric alcohol relative to the content of the component (A) is preferably 0.01 to 20, more preferably 0.5 to 10, and even more preferably 0.1 to 3, in mass ratio. When polymerized fatty acid (B-2) is used, the content of the polymerized fatty acid is preferably 0.01 to 20, more preferably 0.5 to 10, and even more preferably 0.1 to 3, in mass ratio relative to the content of the component (A). When polyalkylene glycol (B-3) is used, the content of polyalkylene glycol relative to the content of component (A) is preferably 0.01 to 20, more preferably 0.5 to 10, and even more preferably 0.1 to 3, in mass ratio. The total content of the component (B) relative to the content of the component (A) is preferably 0.1 to 20, more preferably 0.5 to 10, and even more preferably 0.75 to 3, in terms of mass ratio. By using it in this range, a water-soluble metalworking fluid having excellent workability can be obtained.

[0031] (C) Amine compounds including trialkanolamines and cyclohexyldialkanolamines The water-soluble metalworking fluid of the present invention uses an amine compound containing trialkanolamine and cyclohexyldialkanolamine.

[0032] In trialkanolamine, the three alkanol groups may be the same or different, but from the viewpoint of water solubility, the number of carbon atoms in each is preferably 1 to 10, more preferably 1 to 6, and even more preferably 1 to 4. Furthermore, from the viewpoints of water solubility and odor reduction, the total number of carbon atoms in the three alkanol groups is preferably 3 to 12, more preferably 4 to 10, and even more preferably 4 to 8. Examples of such alkanolamines include triethanolamine, tri-n-propanolamine, tri-i-propanolamine, tri-n-butanolamine, etc. Among these, triethanolamine is preferred because of its excellent water solubility. The trialkanolamine may be used alone or in combination of two or more kinds.

[0033] The cyclohexyl dialkanolamine is not particularly limited, but a preferred example is a compound represented by the following formula (6): [ka] [In the formula, R is an alkylene group, and q is an integer of 1 to 10.]

[0034] In formula (6), preferred examples of the alkylene group represented by R include linear or branched alkylene groups such as methylene, ethylene, propylene, butylene, pentylene, hexylene, heptylene, octylene, nonylene, and decylene. Among these, from the viewpoints of water solubility and wettability, ethylene or propylene is preferred, and ethylene is particularly preferred. In formula (6), q is an integer of 1 to 10, preferably 1 to 7, and more preferably 1 to 3. Specific examples of cyclohexyl dialkanolamine include N-cyclohexyl diethanolamine, N-cyclohexyl diisopropanolamine, etc. Among these, N-cyclohexyl diethanolamine is preferably used. The cyclohexyl dialkanolamines may be used alone or in combination of two or more.

[0035] The content of trialkanolamine relative to the content of the component (A) is preferably 0.5 to 1.5 in mass ratio, more preferably 0.5 to 1, and even more preferably 0.875 to 0.9. The content of cyclohexyl dialkanolamine relative to the content of the component (A) is preferably in a mass ratio of 0.5 to 1.5, more preferably 0.5 to 1, and even more preferably 0.875 to 0.9. The total content of the component (C) relative to the content of the component (A) is preferably 1 to 3, more preferably 1 to 2, and even more preferably 1.75 to 1.80, in terms of mass ratio. By using the compound in this range, a water-soluble metalworking fluid having excellent wettability and processability can be obtained.

[0036] (D)Water In the present invention, component (D) is water for preparing the present oil solution (stock solution). While tap water can be used as component (D), it is preferable to use distilled water or ion-exchanged water. The content of component (D) is the remainder, and is preferably 20 to 50 mass %, more preferably 25 to 45 mass %, and even more preferably 30 to 40 mass %, based on the total amount of the water-soluble metalworking oil of the present invention. When the proportion of component (D) is within the above range, components (A), (B), and (C) are easily dissolved, facilitating preparation of the concentrate. Furthermore, the amount of the concentrate that needs to be stored and transported can be reduced, improving handling.

[0037] (E) Acid phosphates and phosphites From the viewpoint of improving wettability, the water-soluble metalworking fluid of the present invention may further contain, as component (E), at least one selected from the group consisting of acidic phosphate esters and phosphites. Examples of acidic phosphate esters include monoalkyl acid phosphate, dialkyl acid phosphate, monoalkenyl acid phosphate, dialkenyl acid phosphate, and mixtures thereof. As the alkyl group and alkenyl group in these acidic phosphate esters, those exemplified as the alkyl group and alkynyl group in phosphate esters can be used. Specific examples of acidic phosphate esters include 2-ethylhexyl acid phosphate, ethyl acid phosphate, butyl acid phosphate, oleyl acid phosphate, tetracosyl acid phosphate, isodecyl acid phosphate, lauryl acid phosphate, tridecyl acid phosphate, stearyl acid phosphate, and isostearyl acid phosphate. Examples of phosphites include trialkyl phosphites, trialkenyl phosphites, tricycloalkyl phosphites, triaryl phosphites, trialalkyl phosphites, etc. As the alkyl group, alkenyl group, cycloalkyl group, aryl group, and aralkyl group in these phosphites, those exemplified as the alkyl group, alkenyl group, cycloalkyl group, aryl group, and aralkyl group in the phosphate ester can be used. Specific examples of phosphite esters include triethyl phosphite, tributyl phosphite, triphenyl phosphite, tricresyl phosphite, tri(nonylphenyl) phosphite, tri(2-ethylhexyl) phosphite, tridecyl phosphite, trilauryl phosphite, triisooctyl phosphite, diphenylisodecyl phosphite, tristearyl phosphite, and trioleyl phosphite. These acidic phosphates and phosphites may be used either alone or in combination. The total content of the component (E) relative to the content of the component (A) is preferably in a mass ratio of 0.1 to 10, more preferably 0.2 to 1, and even more preferably 0.50 to 0.55.

[0038] (F) Glycols The water-soluble metalworking oil of the present invention may further contain glycols from the viewpoint of improving wettability. Examples of glycols include ethylene glycol, propylene glycol, 1,4-butanediol, hexamethylene glycol, neopentyl glycol, diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, polyethylene glycol, polypropylene glycol, copolymers of polyethylene glycol and polypropylene glycol, and copolymers of polyoxyethylene and polyoxypropylene, as well as water-soluble glycols such as glycol monoalkyl ethers such as triethylene glycol monobutyl ether, triethylene glycol monomethyl ether, diethylene glycol monobutyl ether, and tripropylene glycol monomethyl ether, and monoalkyl ethers of copolymers of polyoxyethylene and polyoxypropylene, as well as alkylene oxide adducts of acetylene glycol. Among these, alkylene oxide adducts of acetylene glycol are preferred from the viewpoints of wettability and defoaming properties.

[0039] The alkylene oxide adduct of acetylene glycol functions as a so-called nonionic surfactant, and by incorporating such a specific surfactant, the wettability of the water-soluble metalworking oil of the present invention is improved, making it easier for the oil to penetrate into the metal material being worked. As the alkylene oxide adduct of acetylene glycol, for example, the alkylene oxide adducts of acetylene glycol described in JP-A-2011-12249 or JP-A-2012-12504 can be suitably used. Specifically, alkylene oxide adducts of acetylene glycol include 2,5,8,11-tetramethyl-6-dodecyne-5,8-diol, 5,8-dimethyl-6-dodecyne-5,8-diol, 2,4,7,9-tetramethyl-5-dodecyne-4,7-diol, 8-hexadecyne-7,10-diol, 7-tetradecyne-6,9-diol, 2,3,6,7-tetramethyl-4-octyne-3,6-diol, 3,6-diethyl-4-octyne-3,6-diol, 2,5-dimethyl-3-hexyne-2,5-diol, 2,4,7,9-tetramethyl-5-decyne-4,7-diol, and 3,6-dimethyl-4-octyne-3,6-diol. Examples of alkylene oxides include ethylene oxide (EO) and propylene oxide (PO).

[0040] From the viewpoint of improving wettability, the alkylene oxide adduct of acetylene glycol preferably has an HLB (Hydrophilic-Lipophilic Balance) of 4 to 12, more preferably 4 to 9, and even more preferably 4 to 8. When the HLB is within this range, the solubility in water is improved. Furthermore, the wettability of the present processing oil is further improved and foaming is less likely to occur. In addition, a contamination suppression effect is also obtained. In one embodiment of the present invention, the alkylene oxide adduct of acetylene glycol preferably contains two types of such adducts with an HLB difference of 1 or more. When the present processing oil contains such adducts with an HLB difference of 1 or more, the affinity for both water and metal materials is improved, thereby further improving the wettability of metal materials. Therefore, the HLB difference is more preferably 2 or more, and even more preferably 3 or more. Note that the "HLB value" refers to the HLB (Hydrophilic-Lipophilic Balance) value calculated by the Griffin method.

[0041] The glycols may be used alone or in combination of two or more. The total content of glycols relative to the content of component (A) is preferably a mass ratio of 0.01 to 10, more preferably 0.1 to 1, and even more preferably 0.55 to 0.60. Within this range, the effect of improving wettability to metal materials can be fully exerted.

[0042] (G) Anti-corrosion agents (metal deactivators) The water-soluble metalworking oil of the present invention may further contain an anti-corrosion agent from the viewpoint of improving corrosion resistance. Examples of the anti-corrosion agent include benzotriazole, imidazoline, pyrimidine derivatives, thiadiazole, thiadiazole, and phosphate esters. Examples of phosphate esters include trialkyl phosphate, trialkenyl phosphate, tricycloalkyl phosphate, triaryl phosphate, tricycloalkyl phosphate, trialalkyl phosphate, and alkyl ether phosphate esters (for example, polyoxyethylene alkyl ether phosphate ester, polyoxyethylene alkylphenyl ether phosphate ester). In these phosphate esters, the alkyl group is a linear or branched alkyl group having 1 to 18, preferably 1 to 12, carbon atoms, such as a methyl group, an ethyl group, an n-propyl group, an isopropyl group, various butyl groups, various pentyl groups, various hexyl groups, various heptyl groups, various octyl groups, various nonyl groups, various decyl groups, various undecyl groups, various dodecyl groups, various tridecyl groups, various tetradecyl groups, various pentadecyl groups, various hexadecyl groups, various heptadecyl groups, and various octadecyl groups. The alkenyl group includes linear and branched alkenyl groups having preferably 2 to 18, and more preferably 2 to 12, carbon atoms, such as vinyl, allyl, propenyl, isopropenyl, various butenyl groups, various pentenyl groups, various hexenyl groups, various heptenyl groups, various octenyl groups, various nonenyl groups, various decenyl groups, various undecenyl groups, various dodecenyl groups, various tridecenyl groups, various tetradecenyl groups, various pentadecenyl groups, various hexadecenyl groups, various heptadecenyl groups, and various octadecenyl groups. The cycloalkyl group preferably has 3 to 18 carbon atoms, more preferably 6 to 12 carbon atoms, such as a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantyl group, a bicyclohexyl group, or a decahydronaphthyl group. Examples of the aryl group include a phenyl group, a naphthylphenyl group, a biphenylyl group, a terphenylyl group, a biphenylenyl group, a naphthyl group, a phenylnaphthyl group, an acenaphthylenyl group, an anthryl group, a benzanthryl group, an aceanthryl group, a phenanthryl group, a benzophenanthryl group, a phenalenyl group, a fluorenyl group, and a dimethylfluorenyl group, each of which preferably has 6 to 18 carbon atoms, and more preferably has 6 to 12 carbon atoms. The aralkyl group preferably has 7 to 18 carbon atoms, more preferably 7 to 12 carbon atoms, and examples thereof include a benzyl group, a tolyl group, an ethylphenyl group, a phenethyl group, a dimethylphenyl group, a trimethylphenyl group, and a naphthylmethyl group. These may be used alone or in combination of two or more. The total content of the anti-corrosion agents relative to the content of component (A) is preferably 0.01 to 0.3 in mass ratio, more preferably 0.05 to 0.2, and even more preferably 0.08 to 0.17. Within this range, the effect of improving corrosion resistance can be fully exerted.

[0043] (H) Preservatives (disinfectants) The water-soluble metalworking oil of the present invention may further contain a preservative from the viewpoint of improving antiseptic properties. Examples of preservatives include isothiazolone preservatives such as 5-chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, 2-n-octyl-4-isothiazolin-3-one, and 1,2-benzisothiazolin-one; triazine preservatives such as hexahydro-1,3,5-tris(2-hydroxyethyl)-s-triazine; pyridine-quinoline preservatives such as 2-pyridinethiol sodium-1-oxide (pyrithione sodium) and 8-oxyquinoline; and dimethyldithiocarbamic acid. Examples of preservatives include dithiocarbamate preservatives such as sodium; organic bromine preservatives such as 2,2-dibromo-3-nitrilopropionamide, 2-bromo-2-nitro-1,3-propanediol, 2,2-dibromo-2-nitroethanol, and 1,2-dibromo-2,4-dicyanobutane; methyl p-hydroxybenzoate, ethyl p-hydroxybenzoate, potassium sorbate, sodium dehydroacetate, salicylic acid, zinc bis(2-pyridyldithio-1-oxide), and copper bis(2-sulfidopyridin-1-olato). The total content of the preservatives relative to the content of component (A) is preferably a mass ratio of 0.001 to 1, more preferably 0.005 to 0.1, and even more preferably 0.01 to 0.05. Within this range, the antiseptic effect can be sufficiently improved.

[0044] The water-soluble metalworking oil of the present invention may further contain other components within the scope of the present invention, such as extreme pressure agents, oiliness agents, antifoaming agents, surfactants, antioxidants, etc.

[0045] Examples of extreme pressure agents include sulfur-based extreme pressure agents, phosphorus-based extreme pressure agents, sulfur- and metal-containing extreme pressure agents, and phosphorus- and metal-containing extreme pressure agents. These extreme pressure agents can be used alone or in combination. Any extreme pressure agent containing a sulfur atom or phosphorus atom in the molecule and capable of exhibiting load-bearing and wear resistance properties can be used. Examples of extreme pressure agents containing sulfur in the molecule include sulfurized oils and fats, sulfurized fatty acids, sulfurized esters, sulfurized olefins, dihydrocarbyl polysulfides, thiadiazole compounds, alkylthiocarbamoyl compounds, triazine compounds, thioterpene compounds, and dialkylthiodipropionate compounds. To maximize the blending effect, these extreme pressure agents are blended into the water-soluble metalworking fluid concentrate so that the final diluted solution (coolant) contains approximately 0.05% by mass or more and 0.5% by mass or less.

[0046] Examples of oiliness agents include aliphatic compounds such as aliphatic alcohols and fatty acid metal salts, and ester compounds such as polyol esters, sorbitan esters, and glycerides. From the viewpoint of blending effect, these oiliness agents are blended into the water-soluble metalworking fluid concentrate in an amount of about 0.2 to 2% by mass based on the coolant.

[0047] Examples of antifoaming agents include methylsilicone oil, fluorosilicone oil, polyacrylate, etc. From the viewpoint of blending effect, the blending amount of these antifoaming agents is blended into the water-soluble metalworking fluid concentrate so that the blending amount is about 0.004% by mass or more and 0.08% by mass or less based on the coolant.

[0048] Examples of surfactants include anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants. Anionic surfactants include alkylbenzene sulfonates and alphaolefin sulfonates. Cationic surfactants include quaternary ammonium salts such as alkyltrimethylammonium salts, dialkyldimethylammonium salts, and alkyldimethylbenzylammonium salts. Nonionic surfactants include ethers such as polyoxyethylene alkyl ethers and polyoxyethylene alkylphenyl ethers, esters such as sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and polyoxyethylene fatty acid esters, and amides such as fatty acid alkanolamides. Amphoteric surfactants include alkyl betaines, such as betaine surfactants. These surfactants are blended into the water-soluble metalworking fluid concentrate in an amount of approximately 5% to 40% by mass based on the coolant to maximize their effectiveness.

[0049] Examples of antioxidants include amine-based antioxidants such as alkylated diphenylamine, phenyl-α-naphthylamine, and alkylated phenyl-α-naphthylamine; phenol-based antioxidants such as 2,6-di-t-butylphenol, 4,4'-methylenebis(2,6-di-t-butylphenol), isooctyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, n-octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, and 2,6-di-tert-butyl-p-cresol; sulfur-based antioxidants such as dilauryl-3,3'-thiodipropionate; phosphorus-based antioxidants such as phosphites; and molybdenum-based antioxidants. To maximize their effectiveness, these antioxidants are blended into the water-soluble metalworking fluid concentrate in an amount of approximately 0.1% to 1% by mass based on the coolant.

[0050] These components may be used alone or in combination of two or more.

[0051] The water-soluble metalworking oil (stock solution) of the present invention can be used as a water-soluble metalworking fluid (coolant) by diluting it with water to a suitable concentration depending on the intended use. The water-soluble metalworking oil (stock solution) of the present invention is usually diluted with water 2 to 300 times (volume ratio), preferably 5 to 200 times, more preferably 10 to 100 times, before use as a water-soluble metalworking fluid.

[0052] According to a preferred embodiment of the present invention, the water-soluble metalworking oil of the present invention has excellent processability (low coefficient of friction), corrosion resistance, aluminum tarnish prevention properties, wettability, copper tarnish prevention properties, and wettability, and therefore can be suitably used for the plastic working of metal materials, particularly aluminum.

[0053] In the water-soluble metalworking oil of the present invention, since the desired workability is easily obtained, the total content of components (A), (B), (C) and (D) is preferably 60 to 100 mass%, more preferably 70 to 100 mass%, even more preferably 75 to 100 mass%, and particularly preferably 80 to 100 mass%, based on the total amount of the water-soluble metalworking oil. The total content of components (A), (B), (C), (D), (E), (F), (G) and (H) is preferably 80 to 100 mass%, more preferably 85 to 100 mass%, even more preferably 90 to 100 mass%, and particularly preferably 95 to 100 mass%, based on the total amount of the water-soluble metalworking oil.

[0054] 2. Manufacturing method of water-soluble metalworking fluids The water-soluble metalworking oil of the present invention is (A) Carboxylic acids having 8 to 18 carbon atoms; (B) at least one selected from the group consisting of alkylene oxide adducts of polyhydric alcohols, polymerized fatty acids, and polyalkylene glycols; (C) amine compounds including trialkanolamines and cyclohexyldialkanolamines; and (D)Water It can be produced by mixing the following: Also, optionally, (E) at least one selected from the group consisting of acid phosphate esters and phosphites; (F) glycols; (G) anti-corrosion agents; and (H) Preservatives may be further mixed. The components and their contents are as described above in "1. Water-soluble metalworking fluids." The other components described above may also be mixed. By mixing these components, the water-soluble metalworking oil of the present invention can be produced.

[0055] 3.Water-soluble metal working fluid The water-soluble metalworking fluid of the present invention contains the water-soluble metalworking oil and water in an amount 2 to 300 times by volume relative to the water-soluble metalworking oil. The amount of water is preferably 5 to 200 times, more preferably 10 to 100 times, the amount of water in an amount 5 to 200 times, more preferably 10 to 100 times, the amount of water relative to the water-soluble metalworking oil. In the water-soluble metalworking fluid of the present invention, the content of (A) the carboxylic acid having 8 to 18 carbon atoms is preferably in the range of 0.005 to 15 mass%, more preferably 0.05 to 10 mass%, and even more preferably 0.1 to 5 mass%, based on the total amount of the water-soluble metalworking fluid, from the viewpoint of improving wettability.

[0056] The water-soluble metalworking fluid obtained by diluting the water-soluble metalworking oil of the present invention with water can be suitably used in various metalworking fields, including punching, cutting, grinding, polishing, drawing, drawing, and rolling.

[0057] According to a preferred embodiment of the present invention, the water-soluble metalworking fluid of the present invention has excellent wettability regardless of the dilution concentration, and is therefore suitable for not only soft aluminum plates such as aluminum fin materials, but also hard iron plates such as copper plates and carbon steel plates (e.g., S45C thin plates). In particular, the water-soluble metalworking fluid of the present invention is suitable for machining aluminum such as aluminum fin materials.

[0058] 4.Metal processing method The metalworking method of the present invention is a metalworking method for processing a workpiece made of metal using a water-soluble metalworking oil (undiluted solution) or a water-soluble metalworking fluid in which the water-soluble metalworking oil is diluted with water. The types of metal processing include cutting, grinding, punching, polishing, drawing, drawing, rolling, etc., and the method can be suitably used in various metal processing fields. Metals to be processed include pure metals consisting of a single metal element and metal-like materials consisting of multiple metal elements or metal elements and non-metal elements. The metal processing method of the present invention is particularly suitable for plastic processing of aluminum, such as aluminum fin materials. [Example]

[0059] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0060] Water-soluble metalworking fluids (stock solutions) were prepared using the compositions shown in Table 1, and the following evaluations were carried out. The results are shown in Table 1.

[0061] [Table 1]

[0062] The ingredients in the table are as follows: [Component (A)] Carboxylic acids with 8 to 18 carbon atoms 1: Dodecanedioic acid Carboxylic acids with 8 to 18 carbon atoms 2: Lauric acid Carboxylic acids with 8 to 18 carbon atoms 3: Decanedioic acid (sebacic acid) Carboxylic acids with 8 to 18 carbon atoms 4: Neodecanoic acid [(B) Component]” (B-1) Alkylene oxide adduct of polyhydric alcohol 1: Pentaerythritol polyoxyethylene ether, Nippon Emulsifier "PNT-40" (B-2) Polymerized fatty acid 1: ricinoleic acid hexamer (castor oil fatty acid polycondensate): acid value 31.6, hydroxyl value 9.4 mg KOH / g, weight average molecular weight 2000 The acid value of the polymerized fatty acid is a value measured based on JIS K2501:2003, and the hydroxyl value is a value measured based on JIS K0070:1992. (B-3) Polyalkylene glycol 1: MeO(PO)a((EO)b / (PO)c)(PO)dH, a / b / c / d = 292 / 800 / 614 / 580, random reverse type, EO / PO = 35 / 65, weight average molecular weight 2286 [(C) component] Trialkanolamine 1: Triethanolamine Cyclohexyldialkanolamine 1: N-cyclohexyldiethanolamine [(D) component] Water: Tap water [(E) component]” Acid phosphate ester 1: Oleyl acid phosphate, phosphorus content 6.3%, acid value 188mgKOH / g [Component (F)] Glycol 1: Ethoxylated 2,4,7,9-tetramethyl-5-decyne-4,7-diol Glycol 2: EO adduct of ethoxylated 2,4,7,9-tetramethyl-5-decyne-4,7-diol: Mixture of HLB4 and 8 The term "HLB value" refers to the HLB (Hydrophilic-Lipophilic Balance) value calculated by the Griffin method. [(G) component] Anti-corrosion agent 1: 1,2,3-benzotriazole Anti-corrosion agent 2: Phosphate ester (polyoxyethylene alkyl (12-15) ether phosphate ester, alkyl portion has 12-15 carbon atoms) [(H) component] Preservative 1: 1,2-benzisothiazolin-3-one Preservative 2: Sodium pyrithione [Other ingredients] Antioxidant 1: 2,6-di-tert-butyl-p-cresol Antifoaming agent 1: Silicone-based antifoaming agent (polyorganosiloxane)

[0063] The stock solution stability, rust prevention, putrefaction resistance, aluminum discoloration, wettability, copper discoloration and processability were evaluated by the following methods.

[0064] (1) Stock solution stability Each component of the stock solution was placed in a beaker and mixed with a stirrer to form a homogeneous solution. After leaving the solution to stand overnight, the state of the solution in the beaker was visually observed and the stock solution stability was evaluated according to the following criteria. A: Dissolved B: Dispersed (cloudy) C: Hardened

[0065] (2) Rust resistance (DIN) A rust prevention test (casting chip test) was conducted in accordance with DIN51360-02A. Specifically, the following is the procedure: Two grams of casting chips (cast iron chips obtained by dry-cutting FC-250) were placed on a 70 mm diameter filter paper (Type 5C) in a petri dish, ensuring no chips overlapped. The dish was then immersed in 2 mL of the evaluation dilution solution (diluted with tap water) and covered. The dish was left at room temperature for two hours, and the presence or absence of rust transferred to the filter paper was assessed using a five-level rust level scale (0, 1, 2, 3, 4). This casting chip test was performed for each concentration of the evaluation dilution solution. Diluting the dilution solution resulted in worsening rust levels, while increasing the dilution solution resulted in better rust levels. The above test was performed for each dilution solution concentration, and the minimum concentration at which no rust was observed (rust level = 0) was defined as the rust prevention limit (mass%), which serves as an index for the rust prevention properties of the sample. The rust prevention limit is expressed as the ratio of the original solution to the diluted solution when diluted with ion-exchanged water. In Table 1, "DIN x 10" indicates the rust prevention limit when the original solution is diluted 10 times with ion-exchanged water. Similarly, "DIN x 20," "DIN x 30," "DIN x 50," "DIN x 80," and "DIN x 100" represent the rust prevention limits when the original solution is diluted at each dilution rate.

[0066] (3) Rot resistance To 100 ml of a sample prepared by diluting water-soluble metalworking fluid with water to 2% by volume, 5 ml of putrefactive fluid A and 0.5 ml of putrefactive fluid B shown below were added, and the mixture was shaken at 30°C and 150 rpm for 7 days, and the viable bacterial count was measured. After measuring the viable bacterial count on the 7th day, 2.5 ml of putrefactive fluid A and 0.25 ml of putrefactive fluid B were added, and the mixture was shaken for another 7 days, and the viable bacterial count was measured. The putrefactive test conditions and viable bacterial count measurement method were as follows: <Conditions for decay testing> Culture conditions: 3 g of FC200 dry chips was added, and the mixture was shaken at 30°C and 150 rpm. Putrid fluid A: Decayed and deteriorated water-soluble processing oil was added with Nippon Pharmaceutical's SCD medium "Daigo" and activated by aeration for 72 hours. Putrid fluid B: Decayed and deteriorated water-soluble processed oil solution was added to Nippon Pharmaceutical's potato dextrose agar medium "Daigo" and activated by aeration for 72 hours. <Method for measuring viable bacteria count> The number of bacteria in 1 ml or the degree of bacterial contamination was measured using a Sanai Biochecker manufactured by Sanai Oil Co., Ltd., and was displayed based on the following criteria for displaying viable bacterial counts. In addition, the viable bacterial counts after 14 days were evaluated for spoilage resistance based on the following criteria for evaluating spoilage resistance. <Spoilage resistance rating> A: General bacteria not detected ~ 10 3 / mL, mold, yeast, and anaerobic bacteria not detected B: General bacteria 10 4 More than 100 / mL, mold, yeast, and anaerobic bacteria not detected C: General bacteria 10 4 More than 100 / mL, mold, yeast, and anaerobic bacteria detected

[0067] (4) Aluminum discoloration The following two types of test pieces were prepared. JIS A6061 (aluminum alloy): 75 x 25 x 1 mm JIS ADC12 (aluminum alloy): 81 x 19 x 11 mm Next, both sides of each test piece were polished evenly with sandpaper (C320), and the polished powder was wiped off.The polished test pieces were then placed in a beaker, and acetone was added until the test pieces were submerged.Then, the test pieces were washed for 10 minutes in an ultrasonic cleaner (manufactured by AS ONE Corporation, model name "USD-2R"), and the test pieces were placed in a basket so that they did not overlap each other and left to dry. Next, a sample solution (a 20-fold dilution of the original solution with ion-exchanged water (5% diluted solution)) is placed in a 100 mL sample bottle with a lid, and the bottle is filled with the test cleaning solution so that the entire polished test piece is immersed in the cleaning solution.The bottle is then covered with the lid and left to stand in a thermostatic bath at 60°C for 2 hours.The test piece is then removed, washed with tap water, and then wiped dry. The degree of discoloration of the appearance of each test piece thus obtained was visually observed, and aluminum discoloration resistance (discoloration prevention ability) was evaluated according to the following criteria. A: No discoloration on the immersed surface B: Less than 50% of the immersion surface is discolored C: More than 50% of the immersion surface has discolored The evaluation results are shown as AA, DD, etc. for the discoloration caused by A6061 and ADC12. The appearance of the aqueous solution after the immersion test was also visually observed to check for the presence or absence of cloudiness or precipitation.

[0068] (5) Wettability The contact angle of ion-exchanged water on the surface of an aluminum fin (bare material) was measured using a contact angle meter "DM500" manufactured by Kyowa Interface Science Co., Ltd. The wettability was evaluated according to the following criteria. A: Contact angle 40° or less B: Contact angle 40~60° C: Contact angle 60° or more

[0069] (6) Copper discoloration (copper plate corrosion test) A copper plate corrosion test was carried out in accordance with JIS K 2513:2000, and the corrosion resistance was evaluated according to the following criteria. A: No discoloration is observed on the copper plate. C: Discoloration is observed on the copper plate

[0070] (7) Processability (friction coefficient) The stock solution was diluted 50 times (by volume) with ion-exchanged water, and then applied to a test piece, and the dynamic friction coefficient (μ) was determined by the reciprocating dynamic friction test described below. As a reference example, a test using only ion-exchanged water was also conducted.

[0071] <Reciprocating friction test> Testing machine: Reciprocating friction testing machine (manufactured by Orientec Co., Ltd.) Test piece: Pre-coated aluminum fin material for heat exchangers (Polyethylene glycol is applied to the surface as a hydrophilic film) Test conditions: Liquid temperature: 70℃ Load: 3kgf (29N) Sliding speed: 20mm / s Amplitude: 50mm Under these conditions, the highest friction coefficient was read from the first sliding. Note that the friction coefficient is an average value measured for three test pieces for each of the examples and comparative examples.

[0072] The evaluation results are shown in Table 1. As shown in Table 1, the water-soluble metalworking oil of the present invention achieved good results in terms of stock solution stability, rust prevention, putrefaction resistance, aluminum tarnish resistance, wettability, copper tarnish resistance, and processability (Examples 1 to 7). In particular, when a combination of an alkylene oxide adduct of a polyhydric alcohol, a polymerized fatty acid, and a polyalkylene glycol was used as component (B), the processability (low coefficient of friction), stock solution stability, rust prevention, putrefaction resistance, aluminum tarnish resistance, wettability, and copper tarnish resistance were excellent (Example 3). On the other hand, when the combination of the amine compound of component (C) was lacking, the processability was reduced, and the desired effects in terms of rust prevention, corrosion resistance, aluminum tarnish resistance, wettability, and copper tarnish resistance were not obtained in some cases (Comparative Examples 1 to 4). [Industrial Applicability]

[0073] The water-soluble metalworking oil and water-soluble metalworking fluid of the present invention can be suitably used for the plastic working of metal materials, particularly aluminum such as aluminum fin materials.

Claims

1. (A) a carboxylic acid having 8 to 18 carbon atoms; (B) at least one selected from the group consisting of alkylene oxide adducts of polyhydric alcohols, polymerized fatty acids, and polyalkylene glycols; (C) an amine compound consisting of trialkanolamine and cyclohexyldialkanolamine; and (D) Water A water-soluble metalworking oil comprising: The component (A) is one or more saturated fatty acids selected from octanoic acid, 2-ethylhexanoic acid, isooctanoic acid, nonanoic acid, isononanoic acid, decanoic acid, isodecanoic acid, neodecanoic acid, undecanoic acid, isoundecanoic acid, lauric acid, isododecanoic acid, tridecanoic acid, isotridecanoic acid, tetradecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecanoic acid, isostearic acid, nonanedioic acid, undecanedioic acid, sebacic acid, and dodecanedioic acid; The alkylene oxide adduct of the polyhydric alcohol of the component (B) is a compound represented by the following general formula (1): 【Chemical 1】 (In the above formula (1), R １１ , R １２ , R １３ and R １４ are each independently an alkylene group having 1 to 5 carbon atoms; e, f, g, and h are each independently an integer of 1 to 30; and EO is an ethylene oxide unit. the polymerized fatty acid of the component (B) is at least one selected from the group consisting of a fatty acid multimer (b2-1), a polycondensed fatty acid (b2-2) obtained by dehydration polycondensation of a hydroxycarboxylic acid, and a polycondensed fatty acid (b2-3) obtained by dehydration polycondensation of an alcoholic hydroxyl group of the polycondensed fatty acid (b2-2) with a monocarboxylic acid, The polyalkylene glycol of the component (B) is a compound represented by the following general formula (5): R １ O-(R’O) ｐ -H (5) (In the above formula (5), R １ is a hydrogen atom or an alkyl group having 1 to 30 carbon atoms. R'O is an oxide unit selected from propylene oxide (PO) and ethylene oxide (EO), and multiple R'O may be the same or may be a mixture of PO and EO. p is an integer of 1 to 200. The content of the component (A) is 5 to 30 mass% based on the total amount of the water-soluble metalworking oil; the total content of the component (B) relative to the content of the component (A) is 0.1 to 20 in terms of mass ratio, the total content of the component (C) relative to the content of the component (A) is 1.375 to 2.4 in terms of mass ratio, the content of the trialkanolamine in the component (C) is 0.5 to 0.9 in terms of mass ratio relative to the content of the component (A), the content of the cyclohexyl dialkanolamine in the component (C) is 0.875 to 1.5 in terms of mass ratio relative to the content of the component (A); Water-soluble metalworking oils (excluding the following (1) to (4)) (1) A water-soluble metalworking oil containing a dicarboxylic acid having a sulfide structure; (2) A water-soluble metalworking oil containing a linear aliphatic monocarboxylic acid, a branched aliphatic monocarboxylic acid, and a dicarboxylic acid as the carboxylic acid, and a primary alkanolamine and a tertiary alkanolamine as the alkanolamine; (3) A water-soluble metalworking fluid containing a primary amine, a tertiary cycloalkylamine, and an amino acid, and containing no boron or secondary amines; (4) A water-soluble metalworking oil containing 15% by mass or more and 65% by mass or less of an α-olefin having 14 to 16 carbon atoms; (Except).

2. 2. The water-soluble metalworking oil according to claim 1, wherein the content of the component (A) is 5 to 20 mass % based on the total amount of the water-soluble metalworking oil.

3. 2. The water-soluble metalworking fluid according to claim 1, wherein the alkylene oxide adduct of polyhydric alcohol of component (B) is at least one selected from the group consisting of an ethylene oxide adduct of pentaerythritol and an ethylene oxide adduct of trimethylolpropane.

4. 4. The water-soluble metalworking oil according to claim 1, wherein the content of the component (D) is 20 to 50 mass% based on the total amount of the water-soluble metalworking oil.

5. 5. The water-soluble metalworking oil according to claim 1, wherein the component (B) comprises the alkylene oxide adduct of the polyhydric alcohol, the polymerized fatty acid, and the polyalkylene glycol.

6. the component (B) contains the alkylene oxide adduct of the polyhydric alcohol, the polymerized fatty acid, and the polyalkylene glycol, the content of the alkylene oxide adduct of the polyhydric alcohol is 0.01 to 10 in terms of mass ratio relative to the content of the component (A), the content of the polymerized fatty acid is 0.01 to 10 in terms of mass ratio relative to the content of the component (A), The content of the polyalkylene glycol relative to the content of the component (A) is 0.01 to 10 in terms of mass ratio. The water-soluble metalworking oil according to claim 5.

7. The water-soluble metalworking fluid according to claim 1 , further comprising (E) at least one selected from the group consisting of acid phosphate esters and phosphites.

8. 8. The water-soluble metalworking oil according to claim 7, wherein the total content of the component (E) relative to the content of the component (A) is 0.1 to 10 in terms of mass ratio.

9. The water-soluble metalworking oil according to claim 1 , further comprising (F) a glycol (excluding compounds corresponding to the component (B)).

10. 10. The water-soluble metalworking oil according to claim 9, wherein the total content of the component (F) is 0.01 to 10% by mass relative to the content of the component (A).

11. The water-soluble metalworking fluid according to claim 1 , further comprising (G) an anti-corrosion agent.

12. The water-soluble metalworking fluid according to any one of claims 1 to 11, further comprising (H) a preservative.

13. The water-soluble metalworking fluid according to any one of claims 1 to 12, excluding a water-soluble metalworking fluid containing an alkylamine that does not contain a hydroxyl group.

14. The water-soluble metalworking oil according to any one of claims 1 to 13, which is used for machining aluminum.

15. (A) a carboxylic acid having 8 to 18 carbon atoms; (B) at least one selected from the group consisting of alkylene oxide adducts of polyhydric alcohols, polymerized fatty acids, and polyalkylene glycols; (C) an amine compound consisting of trialkanolamine and cyclohexyldialkanolamine; and (D) Water A method for producing a water-soluble metalworking oil, comprising mixing The component (A) is one or more saturated fatty acids selected from octanoic acid, 2-ethylhexanoic acid, isooctanoic acid, nonanoic acid, isononanoic acid, decanoic acid, isodecanoic acid, neodecanoic acid, undecanoic acid, isoundecanoic acid, lauric acid, isododecanoic acid, tridecanoic acid, isotridecanoic acid, tetradecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecanoic acid, isostearic acid, nonanedioic acid, undecanedioic acid, sebacic acid, and dodecanedioic acid; The alkylene oxide adduct of the polyhydric alcohol of the component (B) is a compound represented by the following general formula (1): 【Chemistry 2】 (In the above formula (1), R １１ , R １２ , R １３ and R １４ are each independently an alkylene group having 1 to 5 carbon atoms; e, f, g, and h are each independently an integer of 1 to 30; and EO is an ethylene oxide unit. the polymerized fatty acid of the component (B) is at least one selected from the group consisting of a fatty acid multimer (b2-1), a polycondensed fatty acid (b2-2) obtained by dehydration polycondensation of a hydroxycarboxylic acid, and a polycondensed fatty acid (b2-3) obtained by dehydration polycondensation of an alcoholic hydroxyl group of the polycondensed fatty acid (b2-2) with a monocarboxylic acid, The polyalkylene glycol of the component (B) is a compound represented by the following general formula (5): R １ O-(R’O) ｐ -H (5) (In the above formula (5), R １ is a hydrogen atom or an alkyl group having 1 to 30 carbon atoms. R'O is an oxide unit selected from propylene oxide (PO) and ethylene oxide (EO), and multiple R'O may be the same or may be a mixture of PO and EO. p is an integer of 1 to 200. The content of the component (A) is 5 to 30 mass% based on the total amount of the water-soluble metalworking oil; the total content of the component (B) relative to the content of the component (A) is 0.1 to 20 in terms of mass ratio, the total content of the component (C) relative to the content of the component (A) is 1.375 to 2.4 in terms of mass ratio, the content of the trialkanolamine in the component (C) is 0.5 to 0.9 in terms of mass ratio relative to the content of the component (A), the content of the cyclohexyl dialkanolamine in the component (C) is 0.875 to 1.5 in terms of mass ratio relative to the content of the component (A); A method for producing a water-soluble metalworking oil (wherein the water-soluble metalworking oil is obtained by: (1) A water-soluble metalworking oil containing a dicarboxylic acid having a sulfide structure; (2) A water-soluble metalworking oil containing a linear aliphatic monocarboxylic acid, a branched aliphatic monocarboxylic acid, and a dicarboxylic acid as the carboxylic acid, and a primary alkanolamine and a tertiary alkanolamine as the alkanolamine; (3) A water-soluble metalworking fluid containing a primary amine, a tertiary cycloalkylamine, and an amino acid, and containing no boron or secondary amines; (4) A water-soluble metalworking oil containing 15% by mass or more and 65% by mass or less of an α-olefin having 14 to 16 carbon atoms; (Except).

16. 15. A water-soluble metalworking fluid comprising the water-soluble metalworking oil according to claim 1 and water in an amount of 2 to 300 times by volume the water-soluble metalworking oil.

17. A metalworking method comprising processing a workpiece made of metal with the water-soluble metalworking oil according to any one of claims 1 to 14.

18. A metalworking method, comprising processing a workpiece made of metal with the water-soluble metalworking fluid according to claim 16.

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