Metalworking fluid composition

Abstract

To provide a metalworking oil composition with excellent corrosion resistance, lubricity (cutting property), antifoaming properties, and stability.SOLUTION: There is provided a metalworking oil composition that comprises: a mixture (A) of 1 to 5 mass% of a primary alkanolamine selected from the group consisting of aminobutanol, aminohexanol, aminooctanol, and aminododecanol, 2 to 8 mass% of a secondary alkanolamine selected from the group consisting of diethanolamine, diisopropanolamine, and monobutylmonoethanolamine, and 0.5 to 5 mass% of a tertiary alkanolamine selected from the group consisting of triethanolamine, triisopropanolamine, and diethanolmonoisopropanolamine; a total of 8 to 10.5 mass% of a mixture (B) of a dibasic acid, a straight chain fatty acid and a branched saturated fatty acid; 1 to 8 mass% of a branched alcohol (C) having 8 to 26 carbons; 20 to 60 mass% of a paraffinic mineral oil (D); and water (E).SELECTED DRAWING: None

Description

[Technical Field]

[0001] This invention relates to a water-soluble metalworking fluid composition that can be widely applied to metalworking processes such as cutting and grinding, as well as plastic deformation. [Background technology]

[0002] Cutting fluids widely used in cutting and grinding processes include mineral oil-based, non-water-soluble cutting fluids, and water-soluble cutting fluids containing mineral oil, surfactants, organic amines, etc., which are used after being diluted with water. Furthermore, in water-soluble cutting fluids, preservatives are added or amines with preservative effects are formulated to improve the fluid's resistance to spoilage. However, in recent years, in order to conserve Earth's resources and prevent the deterioration of the global environment, there has been a growing demand for the development of cutting fluids that are even more environmentally friendly than conventional ones, and that can withstand use for as long as possible.

[0003] Conventionally, water-soluble metalworking oils have included, for example, water-soluble cutting oil compositions using fatty acid alkanolamide ethylene oxide adducts, alkylamine ethylene oxide adducts, alicyclic amine ethylene oxide adducts, and fatty acid higher alcohol adducts (Patent Document 1), water-soluble grinding oil compositions using benzene compounds and parahydroxybenzoic acid ester compounds (Patent Document 2), compositions containing primary alkanolamines, carboxylic acids having 6 to 24 carbon atoms, and specific alkylenediamines (Patent Document 3), and water-soluble metalworking oils using aromatic amines or alicyclic amines (Patent Document 4) Examples include water-soluble cutting and grinding fluids using primary, secondary, and tertiary alkylamines, aromatic diamine oxyalkylene adducts, alicyclic diamine oxyalkylene adducts, etc. (Patent Document 5), water-soluble metalworking fluid compositions using unsaturated fatty acids and heterocyclic compounds (Patent Document 6), metalworking fluid compositions and metalworking methods using amines having alkyl groups with 4 or more carbon atoms and amines having cyclocyclic or benzene rings (Patent Document 7), antibacterial water-soluble cutting fluids using alkylenediamines (Patent Document 8), and metalworking fluids using amino alcohols as biocides (Patent Document 9).

[0004] However, while these water-soluble metalworking fluids are effective against general bacteria, they are not sufficiently effective against mold and yeast. Furthermore, those that are effective use halogen-containing compounds, polycyclic aromatic compounds, phenolic compounds, or metal salts, some of which are PRTR-listed substances, raising concerns about their effects on human health.

[0005] Preservatives, specifically amines, were essential compounds for improving the spoilage resistance of oils.

[0006] On the other hand, as means of improving machinability, for example, as a method to improve lubrication, there are known examples such as a hot rolling oil and hot rolling method using a specific palm olein oil (Patent Document 10), a metalworking fluid composition in which the acid value and amine value of all constituent components are set in a specific ratio, a processing method using the same, and metalworking parts manufactured by the metalworking method (Patent Document 11).

[0007] However, while these water-soluble metalworking fluids are effective in general cutting operations, they do not meet the cutting performance requirements for heavy-duty cutting operations. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Special Publication No. 6-31388 [Patent Document 2] Special Publication No. 7-37632 [Patent Document 3] Special Publication No. 6-76590 [Patent Document 4] Patent No. 2510233 [Patent Document 5] Japanese Patent Application Publication No. 9-316482 [Patent Document 6] Patent No. 4836341 [Patent Document 7] Patent No. 5255835 [Patent Document 8] Patent No. 5204390 [Patent Document 9] Patent No. 5670882 [Patent Document 10] Patent No. 3320642 [Patent Document 11] Patent No. 6355339 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The present invention aims to provide a metalworking fluid composition that exhibits excellent resistance to decay, lubricity (cutting ability), defoaming properties, and stability. [Means for solving the problem]

[0010] According to the inventors of the present invention, it has been found that such an object can be achieved by using a specific amine, a specific fatty acid, a specific alcohol, and a specific mineral oil in specific ratios. That is, the present invention provides the following metalworking oil compositions, metalworking oils, and metalworking methods: 1. (A) At least one primary alkanolamine (A-1), at least one secondary alkanolamine (A-2), and at least one tertiary alkanolamine (A-3), (B) A total of 8 to 10.5% by mass of at least one dibasic acid (B-1), at least one linear fatty acid (B-2), and at least one branched saturated fatty acid (B-3), (C) 1 to 8% by mass of at least one branched alcohol having 8 to 26 carbon atoms, (D) 20 to 60% by mass of a paraffinic mineral oil, (E) Water containing (A-1) is at least one selected from the group consisting of aminobutanol, aminohexanol, aminooctanol, and aminododecanol, and the content of (A-1) is 1 to 5% by mass, (A-2) is at least one selected from the group consisting of diethanolamine, diisopropanolamine, and monobutylmonoethanolamine, and the content of (A-2) is 2 to 8% by mass, (A-3) is at least one selected from the group consisting of triethanolamine, triisopropanolamine, and diethanolmonoisopropanolamine, and the content of (A-3) is 0.5 to 5% by mass, a metalworking oil composition. 2. (B-1) is at least one selected from the group consisting of sebacic acid, undecanedioic acid, dodecanedioic acid, and 5(or 6)-carboxy-4-hexyl-2-cyclohexene octanoic acid, (B-2) is at least one selected from the group consisting of pelargonic acid, lauric acid, myristic acid, palmitic acid, stearic acid, octadecenoic acid, linoleic acid, linolenic acid, 12-hydroxystearic acid, ricinoleic acid, and erucic acid, The metal working oil composition according to 1 above, wherein (B-3) is at least one selected from the group consisting of isononanoic acid, neononanoic acid, isodecanoic acid, neodecanoic acid, isotridecanoic acid, neotridecanoic acid, isostearic acid, and isoarachidic acid. 3. The metal working oil composition according to 2 above, containing 0.5 to 5% by mass of component (B-1), 2.5 to 5% by mass of component (B-2), and 1 to 4% by mass of component (B-3). 4. The component (D) is a paraffinic mineral oil having a viscosity at 40 °C of 8 to 60 mm 2 / s, and the processing oil composition according to any one of 1 to 3 above. 5. A metal working oil obtained by diluting the metal working oil composition according to any one of 1 to 4 above with water. 6. A metal working method including using the metal working oil composition according to any one of 1 to 4 above or the metal working oil according to 5 above.

Advantages of the Invention

[0011] According to the present invention, a metal working oil composition excellent in corrosion resistance, lubricity (cutting property), defoaming property, and stability can be provided. The metal working oil composition of the present invention is also excellent in hard water resistance. The metal working oil composition of the present invention is also excellent in rust prevention property.

Embodiments for Carrying Out the Invention

[0012] 〔Component (A)〕 Component (A) is a mixture of at least one primary alkanolamine (A-1), at least one secondary alkanolamine (A-2), and at least one tertiary alkanolamine (A-3). Component (A) contributes to stock solution stability, rust prevention property, and corrosion resistance. Examples of the primary alkanolamine (A-1) include aminobutanol, aminohexanol, aminooctanol, aminododecanol, 2-(2-aminoethoxy)ethanol, and monoisopropanolamine. These may be used alone or in combination of two or more. Among these, aminobutanol, aminohexanol, aminooctanol, and aminododecanol are preferred. Examples of secondary alkanolamines (A-2) include diisopropanolamine, 2-(butylamino)ethanol, diethanolamine, methylethanolamine, and ethylethanolamine. These may be used individually or in combination of two or more. Of these, diethanolamine, diisopropanolamine, and monobutylmonoethanolamine are preferred. Examples of tertiary alkanolamines (A-3) include N-methyldiethanolamine, triethanolamine, triisopropanolamine, diethanolmonoisopropanolamine, butyldiethanolamine, dibutylethanolamine, dimethylethanolamine, diethylethanolamine, dimethylisopropanolamine, and diethylisopropanolamine. These may be used individually or in combination of two or more. Of these, triethanolamine, triisopropanolamine, and diethanolmonoisopropanolamine are preferred.

[0013] The content of component (A-1) is preferably 1 to 5% by mass, and more preferably 2 to 5% by mass, based on the total mass of the composition. A content of 1% by mass or more provides sufficient spoilage resistance. A content of 5% by mass or less provides good emulsification stability.

[0014] The content of component (A-2) is preferably 2 to 8% by mass, and more preferably 3 to 7% by mass, based on the total mass of the composition. If it is 2% by mass or more, good stock solution stability can be achieved. If it is 8% by mass or less, the cutting performance can be sufficiently improved.

[0015] The content of component (A-3) is preferably 0.5 to 5% by mass, and more preferably 1 to 4% by mass, based on the total mass of the composition. If it is 0.5% by mass or more, sufficient rust-preventive properties can be achieved. If it is 5% by mass or less, good stability of the undiluted solution can be achieved. The total amount of components (A-1), (A-2), and (A-3) is preferably 10 to 18% by mass, and more preferably 11 to 15.5% by mass, based on the total mass of the composition of the present invention. By including component (A) within this range, good emulsification stability and good stock solution stability can be maintained.

[0016] [Component (B)] Component (B) is a mixture of at least one dibasic acid (B-1), at least one linear fatty acid (B-2), and at least one branched saturated fatty acid (B-3), the total amount of which is 8 to 10.5% by mass, preferably 8.5 to 10% by mass, based on the total mass of the composition of the present invention. By including component (B) within this range, emulsification stability, rust prevention, defoaming properties, and lubricity can be satisfied. Component (B) contributes particularly to emulsification stability, rust prevention, and defoaming properties. Examples of dibasic acids for component (B-1) include succinic acid, adipic acid, sebacic acid, undecanediic acid, dodecanediic acid, and 5(or6)-carboxy-4-hexyl-2-cyclohexene octanoic acid (e.g., "DIACID1550" manufactured by Ingevity). These may be used individually or in combination of two or more. Of these, sebacic acid, undecanediic acid, dodecanediic acid, and 5(or6)-carboxy-4-hexyl-2-cyclohexene octanoic acid are preferred. Examples of linear fatty acids in component (B-2) include caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, lauric acid, myristic acid, pentadecyl acid, palmitic acid, stearic acid, arachidonic acid, behenic acid, lignoceric acid, cerotic acid, montanic acid, melissic acid, palmitoleic acid, margaric acid, vaccenic acid, oleic acid, linoleic acid, linolenic acid, eleostearic acid, eicosadienoic acid, meadic acid, erucic acid, nervonic acid, elaidic acid, arachidonic acid, eicosapentaenoic acid, docosahexaenoic acid, 12-hydroxystearic acid, and ricinoleic acid. These may be used individually or in combination of two or more. Of these, pelargonic acid, lauric acid, myristic acid, palmitic acid, stearic acid, octadecenoic acid, linoleic acid, linolenic acid, 12-hydroxystearic acid, ricinoleic acid, and erucic acid are preferred. Pelargonic acid, lauric acid, oleic acid, ricinoleic acid, and erucic acid are more preferred. Examples of branched fatty acids in component (B-3) include isononanoic acid, neononanoic acid, isodecanoic acid, neodecanoic acid, isotridecanoic acid, neotridecanoic acid, isostearic acid, and isoarachinic acid. These may be used individually or in combination of two or more. Of these, neodecanoic acid, isotridecanoic acid, isostearic acid, or a mixture of two or more of these is preferred. Neodecanoic acid, isostearic acid, or a mixture of these is more preferred. Isostearic acid alone or a mixture of neodecanoic acid and isostearic acid is most preferred.

[0017] The content of component (B-1) is preferably 0.5 to 5% by mass, and more preferably 2 to 4% by mass, based on the total mass of the composition. If it is 0.5% by mass or more, sufficient rust prevention can be achieved. If it is 5% by mass or less, hard water resistance can be sufficiently improved.

[0018] The content of component (B-2) is preferably 2.5 to 5% by mass, and more preferably 3 to 4% by mass, based on the total mass of the composition. If it is 2.5% by mass or more, good emulsification stability can be achieved. If it is 5% by mass or less, sufficient defoaming performance can be achieved.

[0019] The content of component (B-3) is preferably 1 to 4% by mass, and more preferably 1.5 to 3% by mass, based on the total mass of the composition. Within this range, a satisfactory level of defoaming performance can be achieved.

[0020] [Component (C)] Component (C) is at least one branched alcohol having 8 to 26 carbon atoms. Component (C) contributes particularly to the stability of the stock solution at low temperatures. Examples of branched alcohols for component (C) include caprylic alcohol, nonanol, decanol, undecanol, lauryl alcohol, tridecanol, tetradecanol, pentadecanol, myristyl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, linolyl alcohol, eicosanol, henicosanol, tetracosanol, and triacontanol. Of these, isotridecanol, isotetradecanol, isopentadecanol, and isotetracosanol are preferred, and among isotetracosanol, 2-decyl-1-tetradecanol is the most preferred.

[0021] The content of component (C) is 1 to 8% by mass, preferably 3 to 7% by mass, based on the total mass of the composition. If it is 1% by mass or more, good stability of the raw solution at low temperatures can be achieved. If it is 8% by mass or less, good resistance to hard water can be achieved.

[0022] [Component (D)] Component (D) is a paraffinic mineral oil. Component (D) contributes particularly to lubrication. Component (D) has a kinematic viscosity of 8-60 mmHg at 40°C. 2 A paraffinic mineral oil with a viscosity of / s is preferred. In this specification, the kinematic viscosity can be measured according to JIS K 2283.

[0023] The content of component (D) is 20 to 60% by mass, preferably 30 to 40% by mass, based on the total mass of the composition. A content of 20% by mass or more allows for good lubricity. A content of 60% by mass or less allows for good emulsification stability of the diluent.

[0024] [Component (E)] Component (E) is water. Component (E) contributes to the stability of the stock solution. The content of component (E) is the remainder, and specifically, it is preferably 5 to 40% by mass, and more preferably 10 to 30% by mass.

[0025] The metalworking fluid composition of the present invention optionally contains castor fatty acid polycondensates. Dimers to hexamers are particularly preferred. The acid value of the castor fatty acid polycondensates (measured according to JIS K 2501) is preferably 30 to 100. The dimer acts mainly as an emulsifier, and the tetramers and hexamers act mainly as stabilizers of the stock solution. The content is preferably 3 to 20% by mass, and more preferably 5 to 15% by mass, based on the total mass of the composition. When included within this range, the emulsification of the diluted solution and the stability of the stock solution are excellent.

[0026] The metalworking fluid composition of the present invention optionally contains a lubricating oil as a lubricating aid. Examples of lubricating aids include synthetic ester oils, polyol esters, alkylbenzenes, natural oils and fats, polyglycols, poly-α-olefins, etc. These may be used individually or as a blend of multiple oils. Preferably, synthetic ester oils and natural oils and fats are used. Preferred synthetic ester oils include 2-ethylhexyl palmitate, 2-ethylhexyl stearate, or 2-ethylhexyl oleate.

[0027] The lubricating oil content as a lubricating aid is preferably 3 to 20% by mass, and more preferably 5 to 15% by mass, based on the total mass of the metalworking fluid composition of the present invention. Excellent lubrication is achieved when the lubricating oil is included within this range.

[0028] The metalworking fluid composition of the present invention may optionally contain a surfactant. The surfactant may be, for example, an anionic surfactant, a cationic surfactant, a nonionic surfactant, or an amphoteric surfactant. Anionic surfactants and nonionic surfactants are preferred. As anionic surfactants, ether carboxylic acids such as lauryl ether carboxylic acid, obtained by adding acetic acid to the terminal end of a lauryl alcohol EO adduct, and oleyl ether carboxylic acid, obtained by adding acetic acid to the terminal end of an oleyl alcohol EO adduct, are preferred. The number of EO adduct moles of the ether carboxylic acid is preferably 2 to 10. Nonionic surfactants with an HLB of 4 to 14, as represented by Griffin's formula, are preferred. Examples include polyoxyalkylene alkyl (alkenyl) ethers (weight-average molecular weight of approximately 700 to 2000), such as polyoxypropylene monobutyl ether and polyoxyethylene oleyl ether; alkylene oxide adducts of higher amines, such as laurylamine EO adducts and cocoamine EO adducts; and alkylene oxide adducts of higher alcohols, such as C12-14 alcohol EO and PO adducts. Surfactants may be used alone or in combination of two or more types. The surfactant content is preferably 0.2 to 5% by mass, and more preferably 0.5 to 2% by mass, based on the total mass of the composition. When included within this range, the emulsification stability of the diluted solution and the stability of the stock solution are excellent.

[0029] The metalworking fluid composition of the present invention may optionally contain fatty acids such as lauryl succinic acid and stearyl succinic acid, sulfonates such as sodium petroleum sulfonate, and carboxylic acid amides as rust inhibitors. The rust inhibitor content is preferably 0 to 20% by mass, and more preferably 1 to 10% by mass, based on the total mass of the composition.

[0030] Furthermore, the metalworking fluid composition of the present invention may optionally contain a silicone-based defoaming agent, an alcohol-based defoaming agent, a benzotriazole-based metal corrosion inhibitor, and the like. The content of the defoaming agent and the metal corrosion inhibitor is preferably 0.05 to 2% by mass, and more preferably 0.1 to 1% by mass, based on the total mass of the composition.

[0031] Furthermore, the metalworking fluid composition of the present invention may optionally contain preservatives such as benzoisothiazoline, 1,2-benzoisothiazoline-3-one, butylbenzoisothiazoline, and metal pyrithione salts (e.g., sodium omazine, zinc pyrithione), as well as alkylamines such as laurylamine and oleylamine as preservatives or antimicrobial agents. The content of preservatives or antimicrobial agents is preferably 0.1 to 5% by mass, and more preferably 0.2 to 2% by mass, based on the total mass of the composition.

[0032] The pH (25°C) of the metalworking fluid composition of the present invention is preferably 7.0 to 11, and more preferably 8.5 to 11, in a solution obtained by diluting the stock solution with pure water to 5% by mass. A pH of 7.0 or higher provides satisfactory preservative properties. A pH of 11 or lower helps to keep skin irritation low. As pH adjusters, amines other than component (A), such as amines having alicyclic groups like dicyclohexylamine, 1,3-bisaminocyclohexane, and cyclohexylpropyldiamine, or their EO adducts, amines having aromatic cyclic groups like metaxylenediamine, or acids such as lactic acid, malic acid, maleic acid, succinic acid, tartaric acid, citric acid, and boric acid can be used. The metalworking fluid composition of the present invention is generally used after being diluted with water to a concentration of 0.5% by mass or higher. [Examples]

[0033] Compositions for examples and comparative examples with the compositions shown in Table 1 were prepared. <Evaluation Method> (1) Rot resistance To 100 ml of a solution obtained by diluting the composition of the example or comparative example to 3% by weight, 3% by weight of the following putrefactive liquid was added, and the mixture was cultured with shaking at 30°C and 150 rpm for 28 days, after which the number of viable cells (cells / ml) was measured. Corrupted liquid: 50% by mass of an emulsion-type cutting fluid that has deteriorated Tryptic soy medium: 25% by mass Glucose peptone medium: 25% by mass The above was aerated for 24 hours to obtain an activated corrupted liquid The number or contamination level of general bacteria, mold, yeast, and anaerobic bacteria was evaluated using a Sun Eye Biochecker (manufactured by Mi-Ai Oil Co., Ltd.). For general bacteria and yeast, the number of bacteria in 1 mL was evaluated in 8 levels of no, 10 3 or less, 10 3 , 10 4 , 10 5 , 10 6 , 10 7 or more. For mold and anaerobic bacteria, the contamination level was evaluated in 4 levels of no, slight, moderate, and severe. 7 Judgment criteria: For mold, yeast, and anaerobic bacteria, no is considered qualified. Judgment criteria: For general bacteria, 10 or less / mL is considered qualified. 3

[0034] (2) Lubricity (cutting performance) Using the following workpiece materials, M6 tapping was performed under the following conditions, and the cutting resistance during machining was measured. Workpiece tool: Roll tap (OSG B-NRT RH7 M6×1.0) Workpiece material: Aluminum alloy (AC8B-T6, 300×200×30 mm) Cutting speed: 10 m / min Pilot hole: 5.48 mm reamed finish, blind hole Cutting length: 20 mm Concentration: Diluted the undiluted solution to 5% by mass with water Number of passes: 5 Test oil agent: A composition of an example or a comparative example diluted to 5% by mass with water Oil supply method: Fill the pilot hole with the test oil agent Evaluation method: Measure the cutting resistance (torque [N·m]) Judgment criteria: A cutting torque of 2.9 N·m or less is considered qualified.

[0035] (3) Defoaming property The results were evaluated using a 3L gear pump circulation test method. Volume: 3L Flow rate: 17.4L / min Discharge pressure: 0.6 kgf / cm² 2 Nozzle diameter: φ6.5mm Container: Diameter 220mm, Height 300mm Dilution water: Ca: 5 ppm adjusted water (1.8375 mg of calcium chloride dihydrate diluted with distilled water to make 1 L of water) Concentration: Dilute the stock solution to 5% by mass with adjusted water containing 5 ppm Ca. Liquid temperature: 25℃ Judging criteria: A maximum foam height of 200mm or less is considered acceptable.

[0036] (4)Stability of stock solution The composition of the example or comparative example is placed in a candle bottle and left to stand for 168 hours in a constant temperature bath at -5°C, 25°C, and 50°C, and the state of the undiluted solution upon removal is observed. Judgment criteria: If there are no changes in appearance such as separation or solidification, it will be considered a success.

[0037] (5) Emulsification stability (stability of the diluent) The composition of the example or comparative example is diluted in pure water to a concentration of 5% by mass, and 100 mL is placed in a stoppered graduated cylinder. The change in appearance is observed after 1 day at 25°C. Judging criteria: If there are no emulsification defects, it will be considered a pass.

[0038] (6) Hard water resistance First, prepare water by dissolving calcium chloride dihydrate in pure water to a calcium concentration of 100 ppm. Dilute the composition of the example or comparative example in this water to 5% by mass, place it in a mayonnaise bottle, seal it, and observe the change in appearance after 1 day at 25°C. Judgment criteria: If there is no significant scum formation or oil separation, it will be considered acceptable.

[0039] (7) Rust prevention 20g of dry-cut FC200 chips were weighed into a petri dish (60mm in diameter, 15mm in height), 25ml of each sample (diluted solution) was added, and the dish was allowed to stand for 10 minutes. After that, the material was decanted, the lid was closed, and the dish was left at room temperature for 24 hours. The rust formation was visually observed after 24 hours. Evaluation: No rust: ○, Approximately 10% rust: □, Approximately 50% rust: △, Complete rust: × [Table 1] [Table 2]

Claims

1. (A) at least one primary alkanolamine (A-1), at least one secondary alkanolamine (A-2), and at least one tertiary alkanolamine (A-3), (B) At least one dibasic acid (B-1), at least one linear fatty acid (B-2), and at least one branched saturated fatty acid (B-3) together in an amount of 8 to 10.5% by mass, (C) 1 to 8% by mass of at least one branched alcohol having 8 to 26 carbon atoms, (D) Paraffinic mineral oil in an amount of 20 to 60% by mass, (E) Water It contains, (A-1) is at least one selected from the group consisting of aminobutanol, aminohexanol, aminooctanol, and aminododecanol, and the content of (A-1) is 1 to 5% by mass. (A-2) is at least one selected from the group consisting of diethanolamine, diisopropanolamine, and monobutylmonoethanolamine, and the content of (A-2) is 2 to 8% by mass. A metalworking fluid composition wherein (A-3) is at least one selected from the group consisting of triethanolamine, triisopropanolamine, and diethanolmonoisopropanolamine, and the content of (A-3) is 0.5 to 5% by mass.

2. (B-1) is at least one selected from the group consisting of sebaciac acid, undecanediic acid, dodecanediic acid, and 5(or6)-carboxy-4-hexyl-2-cyclohexeneoctanoic acid. (B-2) is at least one selected from the group consisting of pelargonic acid, lauric acid, myristic acid, palmitic acid, stearic acid, octadecenoic acid, linoleic acid, linolenic acid, 12-hydroxystearic acid, ricinoleic acid, and erucic acid. The metalworking fluid composition according to claim 1, wherein (B-3) is at least one selected from the group consisting of isononanoic acid, neononanoic acid, isodecanoic acid, neodecanoic acid, isotridecanoic acid, neotridecanoic acid, isostearic acid, and isoarachinic acid.

3. The metalworking oil composition according to claim 2, comprising 0.5 to 5% by mass of component (B-1), 2.5 to 5% by mass of component (B-2), and 1 to 4% by mass of component (B-3).

4. Component (D) has a viscosity of 8 to 60 mm at 40°C. 2 A metalworking fluid composition according to any one of claims 1 to 3, wherein the paraffinic mineral oil is / s.

5. A metalworking oil prepared by diluting the metalworking oil composition according to any one of claims 1 to 4 with water.

6. A metalworking method comprising using the metalworking oil composition according to any one of claims 1 to 4 or the metalworking oil agent according to claim 5.

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