Water-soluble metalworking fluid

Abstract

Provided is a water-soluble metalworking oil agent containing a base oil (A) containing an oil-soluble polyalkylene glycol (A1), wherein the total content of the water-soluble polyalkylene glycol and the methoxypolyethylene glycol is less than 60% by mass based on the total amount excluding water.

Description

Technical Field

[0001] The present invention relates to a water-soluble metal working oil, a metal working fluid prepared by mixing dilution water with the water-soluble metal working oil, and a metal working method for processing a work material made of metal using the metal working fluid. Background Art

[0002] In the field of metal working such as cutting and grinding, a metal working fluid is used to improve the workability of a work material and suppress wear of a processing tool.

[0003] Metal working fluids include oil-based metal working fluids mainly composed of oils such as mineral oils, synthetic oils, and animal and vegetable oils, and water-soluble metal working fluids obtained by adding a surfactant compound to the oil to impart water solubility. In recent years, water-soluble metal working fluids have been used for reasons of safety such as low fire hazard.

[0004] For example, Patent Document 1 discloses a concentrated metal working fluid containing 60 to 90% by weight of a base oil, 5 to 20% by weight of a glycol ether, 0.01 to 5% by weight of an oil-soluble polyalkylene glycol, and 0.2 to 6% by weight of an additive, wherein the base oil is selected from water-soluble polyalkylene glycols, methoxypolyethylene glycols, and combinations of two or more thereof.

[0005] In addition, Patent Document 2 discloses an invention related to a water-soluble working oil containing methyldicyclohexylamine.

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: International Publication No. 2014 / 089766

[0009] Patent Document 2: International Publication No. 2010 / 113594 Summary of the Invention

[0010] Problems to be Solved by the Invention

[0011] Under such circumstances, there is a demand for a new water-soluble metal working oil having improved various properties that is more easily applicable by metal working than conventional ones, for example, even as an emulsion type or soluble type oil.

[0012] Means for Solving the Problems

[0013] The present invention provides a water-soluble metal working oil containing an oil-soluble polyalkylene glycol as a base oil, and setting the contents of a water-soluble polyalkylene glycol and a methoxypolyethylene glycol to a specified amount or less. Specifically, the present invention provides, for example, the following [1] to

[16] .

[0014] [1] A water-soluble metalworking oil agent containing a base oil (A) comprising an oil-soluble polyalkylene glycol (A1).

[0015] The total content of the water-soluble polyalkylene glycol and methoxypolyethylene glycol is less than 60% by mass based on the total amount excluding water.

[0016] [2] The water-soluble metalworking oil agent according to [1] above, wherein the total content of the water-soluble polyalkylene glycol and methoxypolyethylene glycol is less than 10 parts by mass relative to 100 parts by mass of the total amount of the component (A1).

[0017] [3] The water-soluble metalworking oil agent according to [1] or [2] above, which substantially does not contain a sulfur-based extreme pressure agent.

[0018] [4] The water-soluble metalworking oil agent according to any one of [1] to [3] above, which further contains water (B).

[0019] [5] The water-soluble metalworking oil agent according to any one of [1] to [4] above, wherein the content ratio of the component (A1) in the component (A) is 10 to 100% by mass based on the total amount of the component (A) contained in the water-soluble metalworking oil agent.

[0020] [6] The water-soluble metalworking oil agent according to any one of [1] to [5] above, wherein the content of the component (A1) is 0.01% by mass or more based on the total amount of the water-soluble metalworking oil agent excluding water.

[0021] [7] The water-soluble metalworking oil agent according to any one of [1] to [6] above, which further contains an amine compound (C).

[0022] [8] The water-soluble metalworking oil agent according to any one of [1] to [7] above, which further contains fatty acids (D).

[0023] [9] The water-soluble metalworking oil agent according to any one of [1] to [8] above, which further contains a nonionic surfactant (E).

[0024]

[10] The water-soluble metalworking oil agent according to any one of [1] to [9] above, which is an emulsion-type oil agent classified as type A1 specified in JIS K2241:2017.

[0025]

[11] The water-soluble metalworking oil agent according to any one of [1] to [9] above, which is a soluble-type oil agent classified as type A2 specified in JIS K2241:2017.

[0026]

[12] A water-soluble metalworking oil agent containing a base oil (A) comprising an oil-soluble polyalkylene glycol (A1).

[0027] The total content of the water-soluble polyalkylene glycol and the methoxypolyethylene glycol is less than 10 parts by mass with respect to 100 parts by mass of the total amount of the component (A).

[0028]

[13] A metalworking fluid prepared by mixing dilution water with the water-soluble metalworking oil agent according to any one of the above [1] to

[12] .

[0029]

[14] A metalworking method for processing a work material containing metal using the metalworking fluid according to the above

[13] .

[0030]

[15] The metalworking method according to the above

[14] , wherein the work material has a member containing at least iron or aluminum.

[0031]

[16] The metalworking method according to the above

[14] or

[15] , which suppresses corrosion of a copper-containing member constituting a processing apparatus for processing the work material.

[0032] Advantages of the Invention

[0033] The water-soluble metalworking oil agent according to a preferred embodiment of the present invention can be prepared into a metalworking fluid having excellent various properties such as processability by diluting with dilution water. Detailed Embodiments

[0034] Regarding the numerical ranges described in this specification, the upper limit value and the lower limit value can be arbitrarily combined. For example, when a numerical range is described as "preferably 30 to 100, more preferably 40 to 80", ranges of "30 to 80" and "40 to 100" are also included in the numerical ranges described in this specification. Further, for example, when a numerical range is described as "preferably 30 or more, more preferably 40 or more, and further preferably 100 or less, more preferably 80 or less", ranges of "30 to 80" and "40 to 100" are also included in the numerical ranges described in this specification.

[0035] In addition, as the numerical ranges described in this specification, for example, the description of "60 to 100" means a range of "60 or more and 100 or less".

[0036] In this specification, the "metalworking oil agent" is the stock solution of the metalworking fluid before being diluted with dilution water to form a metalworking fluid, and is a preferred form for transportation and storage before metalworking. Further, the "metalworking fluid" is obtained by diluting the metalworking oil agent as the stock solution with dilution water, and is a preferred form for use in metalworking.

[0037] "Metalworking oil agents" and "metalworking fluids" can also be distinguished by the water content as described below, for example.

[0038] · "Metalworking oil agent": The water content is 0 parts by mass or more and 400 parts by mass or less with respect to 100 parts by mass of the total amount of components other than water.

[0039] · "Metalworking fluid": The water content is more than 400 parts by mass with respect to 100 parts by mass of the total amount of components other than water.

[0040] 〔Composition of water-soluble metalworking oil agent〕

[0041] The water-soluble metalworking oil agent of the present invention is an oil agent containing a base oil (A) containing an oil-soluble polyalkylene glycol (hereinafter, also referred to as "oil-soluble PAG") (A1), and adjusting the total content of a water-soluble polyalkylene glycol (hereinafter, also referred to as "water-soluble PAG") and methoxypolyethylene glycol (hereinafter, also referred to as "MPEG") to a specified content.

[0042] It should be noted that in this specification, "water-soluble" means that the dissolution amount in 100 g of water at 25 °C is 20 g or more, and the total light transmittance of a solution at 25 °C prepared by adding 20 g of the substance to be added to 100 g of water at 25 °C is 90% or more.

[0043] It should be noted that in the following description of this specification, the components described as "water-soluble" are components having the above characteristics.

[0044] In the water-soluble metalworking oil agent according to one embodiment of the present invention, the total content of the water-soluble PAG and MPEG may be less than 60% by mass, less than 50% by mass, less than 40% by mass, less than 30% by mass, less than 20% by mass, less than 10% by mass, less than 5% by mass, less than 1% by mass, or less than 0.1% by mass based on the total amount (100% by mass) excluding water.

[0045] In addition, in the water-soluble metalworking oil agent according to one embodiment of the present invention, the total content of the water-soluble PAG and MPEG may be less than 10 parts by mass, less than 5 parts by mass, less than 1 part by mass, less than 0.1 part by mass, less than 0.01 part by mass, or less than 0.001 part by mass with respect to 100 parts by mass of the total amount of the component (A1).

[0046] The water-soluble metalworking oil agent according to one embodiment of the present invention may further contain water (B). By adjusting the content of water (B), an emulsion-type oil agent classified as type A1 or a soluble-type oil agent classified as type A2 specified in JIS K2241:2017 can be prepared.

[0047] In addition, the water-soluble metalworking oil agent according to one embodiment of the present invention preferably contains one or more selected from amine compounds (C), fatty acids (D), and nonionic surfactants (E), more preferably contains at least components (C) and (D), and further preferably contains all components (C), (D), and (E).

[0048] It should be noted that the water-soluble metalworking oil agent according to one embodiment of the present invention may also contain other components other than components (A) to (E) within the range not impairing the effects of the present invention.

[0049] In the water-soluble metalworking oil agent according to one embodiment of the present invention, the total content of components (A) and (B) is preferably 20% by mass or more, more preferably 30% by mass or more, further preferably 40% by mass or more, still further preferably 45% by mass or more, particularly preferably 50% by mass or more, based on the total amount (100% by mass) of the water-soluble metalworking oil agent. In addition, it may also be set to 100% by mass or less, 95% by mass or less, 90% by mass or less, 85% by mass or less, 80% by mass or less, 75% by mass or less, 70% by mass or less, 65% by mass or less, or 60% by mass or less.

[0050] In the water-soluble metalworking oil agent according to one embodiment of the present invention, the total content of components (A) to (D) is preferably 30% by mass or more, more preferably 40% by mass or more, still more preferably 50% by mass or more, further preferably 60% by mass or more, still further preferably 70% by mass or more, particularly preferably 80% by mass or more, based on the total amount (100% by mass) of the water-soluble metalworking oil agent. In addition, it may also be set to 100% by mass or less, 98% by mass or less, 95% by mass or less, 93% by mass or less, or 90% by mass or less.

[0051] In the water-soluble metalworking oil agent according to one embodiment of the present invention, the total content of components (A) to (E) is preferably 35% by mass or more, more preferably 45% by mass or more, still more preferably 55% by mass or more, further preferably 65% by mass or more, still further preferably 75% by mass or more, particularly preferably 85% by mass or more, based on the total amount (100% by mass) of the water-soluble metalworking oil agent. In addition, it may also be set to 100% by mass or less, 98% by mass or less, 96% by mass or less, or 94% by mass or less.

[0052] Hereinafter, each component contained in the water-soluble metalworking oil agent according to one embodiment of the present invention will be described.

[0053] <Component (A): Base oil>

[0054] The water-soluble metalworking oil agent of the present invention contains a base oil (A) containing an oil-soluble PAG (A1).

[0055] The water-soluble metal working oil agent of the present invention contains an oil-soluble PAG as a base oil, and thus can improve the workability of the metal working fluid formed by mixing dilution water in the water-soluble metal working oil agent.

[0056] It should be noted that generally, in order to form a metal working fluid with excellent workability (especially the workability of a work material containing iron), the water-soluble metal working oil agent as its stock solution contains a sulfur-based extreme pressure agent. However, the sulfur-based extreme pressure agent is the main cause of corrosion of the copper-containing components of the processing equipment used in the metal processing of the work material. On the other hand, the water-soluble metal working oil agent of the present invention can be prepared into a metal working fluid with excellent workability and can also avoid the corrosion problem of copper components by containing the component (A1) even if it substantially does not contain a sulfur-based extreme pressure agent.

[0057] It should be noted that the component (A) used in one embodiment of the present invention may contain other base oils (A2) in addition to the component (A1).

[0058] However, from the viewpoint of making the water-soluble metal working oil agent capable of forming a metal working fluid with excellent workability, in the water-soluble metal working oil agent of one embodiment of the present invention, the content ratio of the component (A1) in the component (A) may be set to 10 to 100% by mass, 20 to 100% by mass, 30 to 100% by mass, 40 to 100% by mass, 50 to 100% by mass, 60 to 100% by mass, 70 to 100% by mass, 75 to 100% by mass, 80 to 100% by mass, 85 to 100% by mass, 90 to 100% by mass, 95 to 100% by mass, or 98 to 100% by mass based on the total amount (100% by mass) of the component (A) contained in the water-soluble metal working oil agent.

[0059] In the water-soluble metal working oil of one embodiment of the present invention, the content of component (A) is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, more preferably 0.1% by mass or more, more preferably 0.5% by mass or more, more preferably 1.0% by mass or more, further preferably 1.5% by mass or more, further preferably 2.0% by mass or more, further preferably 2.5% by mass or more, further preferably 3.0% by mass or more, still more preferably 4.0% by mass or more, still more preferably 5.0% by mass or more, still more preferably 6.0% by mass or more, still more preferably 7.0% by mass or more, still more preferably 8.0% by mass or more, particularly preferably 9.0% by mass or more, and further may be set to 9.5% by mass or more, 10.0% by mass or more, 11.0% by mass or more, or 12.0% by mass or more, in addition, it may also be set to 100% by mass or less, 99% by mass or less, 95% by mass or less, 90% by mass or less, 85% by mass or less, 80% by mass or less, 75% by mass or less, or 70% by mass or less, based on the total amount (100% by mass) of the water-soluble metal working oil excluding water, from the viewpoint of making a water-soluble metal working oil capable of forming a metal working fluid with excellent workability.

[0060] It should be noted that when the oil agent is an emulsion type oil agent classified as type A1 specified in JIS K2241:2017, the content of component (A) can be set to 10% by mass or more, 15% by mass or more, 20% by mass or more, 30% by mass or more, 40% by mass or more, 45% by mass or more, or 50% by mass or more, based on the total amount (100% by mass) of the oil agent excluding water, and the upper limit is as described above.

[0061] When the oil agent is a soluble type oil agent classified as type A2 specified in JIS K2241:2017, the content of component (A) can be set to 60% by mass or less, 50% by mass or less, 40% by mass or less, 30% by mass or less, 25% by mass or less, or 20% by mass or less, based on the total amount (100% by mass) of the oil agent excluding water, and the lower limit is as described above.

[0062] In addition, in the water-soluble metal working oil agent of one embodiment of the present invention, from the viewpoint of making a water-soluble metal working oil agent capable of forming a metal working fluid with excellent workability, the content of component (A) is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, more preferably 0.1% by mass or more, more preferably 0.3% by mass or more, more preferably 0.5% by mass or more, further preferably 0.7% by mass or more, further preferably 1.0% by mass or more, further preferably 1.5% by mass or more, further preferably 2.0% by mass or more, still more preferably 2.5% by mass or more, still more preferably 3.0% by mass or more, still more preferably 3.5% by mass or more, particularly preferably 4.0% by mass or more, and further may be set to 4.5% by mass or more, 5.0% by mass or more, 5.5% by mass or more, 6.0% by mass or more, 6.5% by mass or more, or 7.0% by mass or more. In addition, it is 100% by mass or less, and considering the content of other components, it may also be set to 99% by mass or less, 95% by mass or less, 90% by mass or less, 85% by mass or less, 80% by mass or less, 75% by mass or less, 70% by mass or less, 65% by mass or less, or 60% by mass or less.

[0063] It should be noted that when making an oil agent of the emulsion type classified as type A1 specified in JIS K2241:2017, the content of component (A) may be set to 10% by mass or more, 15% by mass or more, 20% by mass or more, 30% by mass or more, 40% by mass or more, 45% by mass or more, or 50% by mass or more based on the total amount (100% by mass) of the oil agent, and the upper limit is as described above.

[0064] When making an oil agent of the soluble type classified as type A2 specified in JIS K2241:2017, the content of component (A) may be set to 60% by mass or less, 50% by mass or less, 40% by mass or less, 30% by mass or less, 25% by mass or less, 20% by mass or less, 15% by mass or less, or 10% by mass or less based on the total amount (100% by mass) of the oil agent, and the lower limit is as described above.

[0065] <<Component (A1): Oil-soluble polyalkylene glycol (oil-soluble PAG)>>

[0066] As component (A1) used in one embodiment of the present invention, there is no particular limitation as long as it is a polyalkylene glycol (PAG) having a structural unit derived from an alkylene oxide and showing oil solubility.

[0067] It should be noted that in this specification, the judgment as to whether the PAG in question is oil-soluble is made by its miscibility with mineral oil classified as Group 1 in the API (American Petroleum Institute) base oil categories. Specifically, samples with a content ratio of the PAG used as a control to the above-mentioned mineral oil classified as Group 1 [PAG / mineral oil] of 10 / 90 or 90 / 10 by mass are prepared, and the total light transmittance at 25 °C of the samples and standard specimens is measured. When the following criteria (i) and (ii) are satisfied, it is judged as an oil-soluble PAG.

[0068] · (i) In the case of the sample with a content ratio [PAG / mineral oil] = 10 / 90, [the total light transmittance (%) of this sample] - [the total light transmittance (%) of only the aforementioned mineral oil] ≤ 20%.

[0069] · (ii) In the case of the sample with a content ratio [PAG / mineral oil] = 90 / 10, [the total light transmittance (%) of this sample] - [the total light transmittance (%) of the aforementioned PAG] ≤ 20%.

[0070] It should be noted that in the following descriptions of this specification, the components described as "oil-soluble" are, unless otherwise specified, components that satisfy the above criteria (i) and (ii).

[0071] As the component (A1) used in one aspect of the present invention, polymers having a structural unit derived from at least one of propylene oxide and butylene oxide can be cited, such as propylene oxide homopolymers, butylene oxide homopolymers, and propylene oxide - butylene oxide copolymers.

[0072] It should be noted that the component (A1) can be used alone or in combination of two or more.

[0073] From the viewpoint of making a water-soluble metalworking oil agent capable of forming a metalworking fluid with excellent workability, the kinematic viscosity at 40 °C of the component (A1) used in one aspect of the present invention is preferably 9 - 800 mm 2 / s, more preferably 15 - 350 mm 2 / s, still more preferably 20 - 250 mm 2 / s, further preferably 23 - 180 mm 2 / s, even more preferably 25 - 100 mm 2 / s, even more preferably 28.8 - 90 mm 2 / s, particularly preferably 40 - 80 mm 2 / s.

[0074] In addition, from the perspective of preparing a water-soluble metalworking oil agent that can form a metalworking fluid with excellent workability, the viscosity grade of component (A1) used in one embodiment of the present invention as specified by ISO 3448 is preferably VG10, VG15, VG22, VG32, VG46, VG68, VG100, VG150, VG220, VG320, VG460, or VG680, more preferably VG22, VG32, VG46, VG68, or VG100, further preferably VG32, VG46, or VG68, still further preferably VG46 or VG68, particularly preferably VG68.

[0075] In the water-soluble metalworking oil agent of one embodiment of the present invention, based on the total amount (100% by mass) of the water-soluble metalworking oil agent excluding water, from the perspective of preparing a water-soluble metalworking oil agent that can form a metalworking fluid with excellent workability, the content of component (A1) is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, more preferably 0.1% by mass or more, more preferably 0.5% by mass or more, more preferably 1.0% by mass or more, further preferably 1.5% by mass or more, further preferably 2.0% by mass or more, further preferably 2.5% by mass or more, further preferably 3.0% by mass or more, still further preferably 4.0% by mass or more, still further preferably 5.0% by mass or more, still further preferably 6.0% by mass or more, still further preferably 7.0% by mass or more, still further preferably 8.0% by mass or more, particularly preferably 9.0% by mass or more, and further can be set to 9.5% by mass or more, 10.0% by mass or more, 11.0% by mass or more, or 12.0% by mass or more. In addition, it is also 100% by mass or less. When considering the content of other components, it can also be set to 95% by mass or less, 90% by mass or less, 85% by mass or less, 80% by mass or less, 75% by mass or less, 70% by mass or less, or 65% by mass or less.

[0076] It should be noted that when preparing an emulsion-type oil agent classified as type A1 according to JIS K2241:2017, based on the total amount (100% by mass) of the oil agent excluding water, the content of component (A1) can be set to 10% by mass or more, 15% by mass or more, 20% by mass or more, 30% by mass or more, 40% by mass or more, 45% by mass or more, or 50% by mass or more. In addition, the upper limit is as described above.

[0077] When it is made into an oil agent of the soluble type classified as Type A2 specified in JIS K2241:2017, the content of the component (A1) can be set to 60% by mass or less, 50% by mass or less, 40% by mass or less, 30% by mass or less, 25% by mass or less, or 20% by mass or less based on the total amount (100% by mass) of the oil agent excluding water. In addition, the lower limit is as described above.

[0078] <<Component (A2): Base oil other than component (A1)>>

[0079] As the base oil (A2) other than the component (A1) used in one aspect of the present invention, at least one selected from mineral oils and synthetic oils other than oil-soluble PAG can be mentioned.

[0080] It should be noted that in this specification, the above-mentioned water-soluble polyalkylene glycol (water-soluble PAG) and methoxy polyethylene glycol (MPEG) are also included in the component (A2), but the total content of water-soluble PAG and MPEG is as described above.

[0081] As the mineral oil, for example, atmospheric residue obtained by atmospheric distillation of crude oils such as paraffinic crude oil, intermediate-base crude oil, and naphthenic crude oil can be mentioned; distillate oil obtained by vacuum distillation of these atmospheric residues; refined oil obtained by subjecting the distillate oil to one or more refining treatments such as solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, and hydrorefining; etc.

[0082] As the synthetic oil, for example, polyalphaolefins such as alpha-olefin homopolymers or alpha-olefin copolymers (for example, alpha-olefin copolymers having 8 to 14 carbon atoms such as ethylene-alpha-olefin copolymers); isoparaffins; ester oils such as polyol esters, dibasic acid esters, and phosphate esters; ether oils such as polyphenylene ethers; alkylbenzenes; alkylnaphthalenes; synthetic oils (GTL) obtained by isomerizing waxes (GTL wax (Gas To Liquids WAX)) produced from natural gas by the Fischer-Tropsch method, etc.

[0083] From the viewpoint of making a water-soluble metalworking oil agent capable of forming a metalworking fluid with excellent workability, the kinematic viscosity at 40 °C of the component (A2) used in one aspect of the present invention is preferably 2.0 to 150 mm 2 / s, more preferably 3.0 to 120 mm 2 / s, further preferably 5.0 to 100 mm 2 / s, still more preferably 6.0 to 90 mm 2 / s, particularly preferably 7.0 to 80 mm 2 / s.

[0084] In addition, the viscosity index of the component (A2) used in one embodiment of the present invention is preferably 70 or more, more preferably 80 or more, still more preferably 90 or more, even more preferably 100 or more, and particularly preferably 105 or more.

[0085] <Component (B): Water>

[0086] The water-soluble metal working oil agent of one embodiment of the present invention may further contain water (B). By making it a water-soluble metal working oil agent containing water, flame retardancy can be imparted to make it a non-hazardous substance, and the operability during storage is good.

[0087] The water as the component (B) used in one embodiment of the present invention is not particularly limited, and may be any one of, for example, distilled water, ion-exchanged water, tap water, industrial water, etc.

[0088] In the water-soluble metal working oil agent of one embodiment of the present invention, the content of the component (B) is 400 parts by mass or less, preferably 1 to 350 parts by mass, more preferably 2 to 300 parts by mass, still more preferably 3 to 250 parts by mass, and even more preferably 5 to 200 parts by mass with respect to 100 parts by mass of the total amount of the components other than water in the water-soluble metal working oil agent.

[0089] It should be noted that when making it an oil agent of the emulsion type classified as type A1 specified in JIS K2241:2017, the content of the component (B) can be set to 150 parts by mass or less, 100 parts by mass or less, 70 parts by mass or less, 50 parts by mass or less, 40 parts by mass or less, 30 parts by mass or less, 20 parts by mass or less, or 15 parts by mass or less with respect to 100 parts by mass of the total amount of the components other than water in the water-soluble metal working oil agent. In addition, the lower limit is as described above.

[0090] In addition, when making it an oil agent of the soluble type classified as type A2 specified in JIS K2241:2017, the content of the component (B) can be set to 10 parts by mass or more, 30 parts by mass or more, 50 parts by mass or more, 60 parts by mass or more, 70 parts by mass or more, 80 parts by mass or more, 90 parts by mass or more, or 100 parts by mass or more with respect to 100 parts by mass of the total amount of the components other than water in the water-soluble metal working oil agent. In addition, the upper limit is as described above.

[0091] In the water-soluble metal working oil agent of one embodiment of the present invention, the content of the component (B) is preferably 1 to 99% by mass, more preferably 2 to 90% by mass, still more preferably 3 to 85% by mass, and even more preferably 5 to 80% by mass based on the total amount (100% by mass) of the water-soluble metal working oil agent.

[0092] It should be noted that when preparing an oil agent of the emulsion type classified as Type A1 according to JIS K2241:2017, the content of component (B) can be set to 70% by mass or less, 60% by mass or less, 50% by mass or less, 40% by mass or less, 30% by mass or less, 25% by mass or less, 20% by mass or less, or 15% by mass or less based on the total amount (100% by mass) of the water-soluble metalworking oil agent. In addition, the lower limit is as described above.

[0093] In addition, when preparing an oil agent of the soluble type classified as Type A2 according to JIS K2241:2017, the content of component (B) can be set to 10% by mass or more, 15% by mass or more, 20% by mass or more, 25% by mass or more, 30% by mass or more, 35% by mass or more, 40% by mass or more, 45% by mass or more, or 50% by mass or more based on the total amount (100% by mass) of the water-soluble metalworking oil agent. In addition, the upper limit is as described above.

[0094] <Component (C): Amine compound>

[0095] The water-soluble metalworking oil agent according to one embodiment of the present invention preferably further contains an amine compound (C). When the water-soluble metalworking oil agent containing component (C) is prepared into a metalworking fluid by mixing with dilution water, a metalworking fluid with a better emulsified state, further improved antibacterial property, rust prevention property, and workability can be formed.

[0096] It should be noted that component (C) can be used alone or in combination of two or more.

[0097] From the same viewpoint as above, in the water-soluble metalworking oil agent according to one embodiment of the present invention, the content of component (C) is preferably 3 to 70% by mass, more preferably 5 to 60% by mass, further preferably 7 to 50% by mass, still more preferably 10 to 45% by mass, particularly preferably 12 to 40% by mass based on the total amount (100% by mass) of the water-soluble metalworking oil agent excluding water. Furthermore, it can be set to 15% by mass or more, 17% by mass or more, 20% by mass or more, 22% by mass or more, or 24% by mass or more. In addition, it can also be set to 37% by mass or less, 35% by mass or less, 33% by mass or less, 31% by mass or less, 27% by mass or less, or 25% by mass or less.

[0098] In addition, from the same viewpoint as described above, in the water-soluble metal working oil agent of one embodiment of the present invention, the content of component (C) is preferably 2 to 40% by mass, more preferably 4 to 35% by mass, still more preferably 6 to 30% by mass, even more preferably 8 to 25% by mass, particularly preferably 10 to 20% by mass, based on the total amount (100% by mass) of the water-soluble metal working oil agent. Furthermore, it can be set to 11% by mass or more, or 12% by mass or more. In addition, it can also be set to 18% by mass or less, or 16% by mass or less.

[0099] Furthermore, in the water-soluble metal working oil agent of one embodiment of the present invention, the content ratio [(C) / (A1)] of component (C) to component (A1) is preferably 0.01 to 30 in terms of mass ratio, more preferably 0.05 to 25, still more preferably 0.10 to 20, even more preferably 0.20 to 15, particularly preferably 0.25 to 9.0. Furthermore, it can be set to 0.28 or more, 0.30 or more, 0.40 or more, 0.50 or more, 0.60 or more, 0.70 or more, 0.80 or more, 0.90 or more, 1.00 or more, 1.20 or more, 1.40 or more, or 1.60 or more. In addition, it can also be set to 8.0 or less, 7.0 or less, 6.0 or less, 5.0 or less, 4.5 or less, 4.0 or less, 3.5 or less, 3.0 or less, 2.9 or less, 2.8 or less, 2.7 or less, 2.6 or less, 2.5 or less, or 2.4 or less.

[0100] Component (C) used in one embodiment of the present invention can be any one of a monoamine having 1 amino nitrogen atom in one molecule, a diamine having 2 amino nitrogen atoms in one molecule, and a polyamine having 3 or more amino nitrogen atoms in one molecule.

[0101] However, from the viewpoint of making a water-soluble metal working oil agent capable of forming a metal working fluid with further improved antibacterial properties, rust prevention properties, and workability, etc., component (C) used in one embodiment of the present invention preferably contains a monoamine.

[0102] The content ratio of the monoamine is preferably 50 to 100% by mass, more preferably 60 to 100% by mass, still more preferably 70 to 100% by mass, even more preferably 75 to 100% by mass, further preferably 80 to 100% by mass, further preferably 85 to 100% by mass, even more preferably 90 to 100% by mass, even more preferably 95 to 100% by mass, particularly preferably 98 to 100% by mass, based on the total amount (100% by mass) of component (C) contained in the water-soluble metal working oil agent.

[0103] As the monoamine used as the component (C) in one aspect of the present invention, depending on the number of substituents R, it is classified into the primary monoamine represented by the following formula (i), the secondary monoamine represented by the following formula (ii), and the tertiary monoamine represented by the following formula (iii).

[0104] It should be noted that from the viewpoint of forming a water-soluble metalworking oil agent that can form a good emulsified state when formulated with dilution water to form a metalworking fluid, and further improving antibacterial properties, rust prevention properties, workability, etc., the component (C) used in one aspect of the present invention preferably contains at least a tertiary monoamine, more preferably contains at least one of a primary monoamine and a secondary monoamine and a tertiary monoamine, and still more preferably contains at least a secondary monoamine and a tertiary monoamine.

[0105] [Chemical formula 1]

[0106]

[0107] In the above formulas, each R independently represents a substituent. A plurality of Rs may be the same or different from each other. Examples of such substituents include an alkyl group, an alkyl group having a hydroxyl group, an alkenyl group, a cycloalkyl group, a phenyl group, and a benzyl group.

[0108] Examples of the aforementioned alkyl group that can be selected as the substituent R include, for example, methyl, ethyl, propyl (n-propyl, isopropyl), butyl (n-butyl, isobutyl, sec-butyl, tert-butyl), pentyl (n-pentyl, isopentyl, neopentyl), hexyl, heptyl, octyl, 2-ethylhexyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl group, octadecyl, etc.

[0109] This alkyl group may be a straight-chain alkyl group or a branched-chain alkyl group.

[0110] In addition, the number of carbon atoms of this alkyl group is preferably 1 to 30, more preferably 1 to 20, still more preferably 1 to 10, even more preferably 1 to 6, and particularly preferably 1 to 4.

[0111] Examples of the aforementioned alkyl group having a hydroxyl group that can be selected as the substituent R include a group in which at least one hydrogen atom of the above alkyl group is substituted with a hydroxyl group.

[0112] The alkyl group constituting this group may be a straight-chain alkyl group or a branched-chain alkyl group.

[0113] The number of carbon atoms of the aforementioned alkyl group having a hydroxyl group is preferably 1 to 30, more preferably 1 to 20, still more preferably 1 to 10, even more preferably 1 to 6, and particularly preferably 2 to 4.

[0114] Examples of the alkenyl group that can be selected as the substituent R include, for example, ethylidene (vinyl), propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, octadecenyl, etc.

[0115] The alkenyl group can be a straight-chain alkenyl group or a branched alkenyl group.

[0116] In addition, the number of carbon atoms of the alkenyl group is preferably 1 to 30, more preferably 1 to 20, further preferably 1 to 10, still further preferably 1 to 6, and particularly preferably 1 to 3.

[0117] Examples of the cycloalkyl group that can be selected as the substituent R include, for example, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, adamantyl, etc.

[0118] From the viewpoint of forming a metalworking fluid with good emulsification state, further improved antibacterial property, rust prevention property, workability, etc. when formulated into a metalworking fluid by blending with dilution water, the component (C) used in one aspect of the present invention preferably contains an alkanolamine having at least one alkyl group with a hydroxyl group.

[0119] Examples of the alkanolamine include primary alkanolamines in which R in the aforementioned formula (i) is an alkyl group with a hydroxyl group, secondary alkanolamines in which at least one of Rs in the aforementioned formula (ii) is an alkyl group with a hydroxyl group, and tertiary alkanolamines in which at least one of Rs in the aforementioned formula (iii) is an alkyl group with a hydroxyl group.

[0120] Examples of the primary alkanolamine include, for example, ethanolamine, propanolamine, butanolamine, 2-amino-2-methyl-1-propanol, etc.

[0121] Examples of the secondary alkanolamine include, for example, monoethanolamines such as N-methylethanolamine, N-ethylethanolamine, N-propylethanolamine, N-butylethanolamine, N-octylethanolamine, N-stearylethanolamine, N-oleylethanolamine, N-cyclohexylethanolamine, N-phenylethanolamine, N-benzylethanolamine, etc.; monopropanolamines such as N-methylpropanolamine, N-ethylpropanolamine, N-propylpropanolamine, N-butylpropanolamine, N-octylpropanolamine, N-stearylpropanolamine, N-oleylpropanolamine, N-cyclohexylpropanolamine, N-phenylpropanolamine, N-benzyldipropanolamine, etc.; diethanolamine, dipropanolamine, etc.

[0122] Examples of the secondary alkanolamine include monoethanolamines such as N-dimethylethanolamine, N-diethylethanolamine, N-dipropylethanolamine, N-dibutylethanolamine, N-dioctylethanolamine, N-distearylethanolamine, N-dioleylethanolamine, N-dicyclohexylethanolamine, N-diphenylethanolamine, and N-dibenzylethanolamine; monopropanolamines such as N-dimethylpropanolamine, N-diethylpropanolamine, N-dipropylpropanolamine, N-dibutylpropanolamine, N-dioctylpropanolamine, N-distearylpropanolamine, N-dioleylpropanolamine, N-dicyclohexylpropanolamine, N-diphenylpropanolamine, and N-dibenzylpropanolamine; diethanolamines such as N-methyldiethanolamine, N-ethyldiethanolamine, N-propyldiethanolamine, N-butyldiethanolamine, N-octyldiethanolamine, N-stearyldiethanolamine, N-oleyldiethanolamine, N-cyclohexyldiethanolamine, N-phenyldiethanolamine, and N-benzyl diethanolamine; dipropanolamines such as N-methyldipropanolamine, N-ethyldipropanolamine, N-propyldipropanolamine, N-butyldipropanolamine, N-octyldipropanolamine, N-stearyldipropanolamine, N-oleyldipropanolamine, N-cyclohexyldipropanolamine, N-phenyldipropanolamine, and N-benzyl dipropanolamine; triethanolamine, tripropanolamine (such as triisopropanolamine), and the like.

[0123] Among them, from the viewpoint of forming a metalworking fluid with good emulsification state, and further improving antibacterial properties, rust prevention properties, workability, etc. when formulated into a metalworking fluid by mixing with dilution water, the component (C) used in one embodiment of the present invention preferably contains at least a tertiary alkanolamine, more preferably contains at least one of a primary alkanolamine and a secondary alkanolamine and a tertiary alkanolamine, and still more preferably contains at least a secondary alkanolamine and a tertiary alkanolamine.

[0124] The content ratio of the alkanolamine is preferably 5% by mass or more, more preferably 10% by mass or more, still more preferably 20% by mass or more, further preferably 30% by mass or more, still further preferably 35% by mass or more, particularly preferably 40% by mass or more, and further can be set to 45% by mass or more, 50% by mass or more, or 55% by mass or more, in addition, it can also be set to 100% by mass or less, 95% by mass or less, 90% by mass or less, 85% by mass or less, 80% by mass or less, 75% by mass or less, 70% by mass or less, or 65% by mass or less, based on the total amount (100% by mass) of the component (C) contained in the water-soluble metalworking oil agent.

[0125] The component (C) used in one embodiment of the present invention preferably contains an alicyclic amine.

[0126] Examples of the alicyclic amine include primary alicyclic amines in which R in the aforementioned formula (i) is a cycloalkyl group, secondary alicyclic amines in which at least one of Rs in the aforementioned formula (ii) is a cycloalkyl group, and tertiary alicyclic amines in which at least one of Rs in the aforementioned formula (iii) is a cycloalkyl group.

[0127] Examples of the primary alicyclic amine include N-cyclohexylamine and the like.

[0128] Examples of the secondary alicyclic amine include monocyclohexylamines such as N-methylcyclohexylamine, N-ethylcyclohexylamine, N-propylcyclohexylamine, and N-oleycyclohexylamine; monocycloalkylalkanolamines such as N-cyclohexylethanolamine and N-cyclohexylpropanolamine; and N-dicyclohexylamine and the like.

[0129] Examples of the tertiary alicyclic amine include dialkylmonocyclohexylamines such as N-dimethylcyclohexylamine, N-diethylcyclohexylamine, N-dipropylcyclohexylamine, N-dioleycyclohexylamine, and N-dicyclohexylamine; monocycloalkyldialkanolamines such as N-cyclohexyl diethanolamine and N-cyclohexyl dipropanolamine; monoalkyldicyclohexylamines such as N-methyl dicyclohexylamine, N-ethyl dicyclohexylamine, N-propyl dicyclohexylamine, and N-oley dicyclohexylamine; dicycloalkylalkanolamines such as N-dicyclohexylethanolamine and N-dicyclohexylpropanolamine; and tricyclohexylamine and the like.

[0130] It should be noted that when the oil agent is an emulsion type classified as Class A1 according to JIS K2241:2017, component (C) preferably contains one or more selected from dialkylmonocyclohexylamines and monoalkyldicyclohexylamines, and more preferably contains monoalkyldicyclohexylamine.

[0131] In addition, when the oil agent is a soluble type classified as Class A2 according to JIS K2241:2017, component (C) preferably contains one or more selected from monocycloalkyldialkanolamines and dicycloalkylalkanolamines, and more preferably contains monocycloalkyldialkanolamine.

[0132] The content ratio of the alicyclic amine is based on the total amount (100% by mass) of component (C) contained in the water-soluble metal working oil agent, and is preferably 10% by mass or more, more preferably 20% by mass or more, further preferably 25% by mass or more, still more preferably 30% by mass or more, particularly preferably 35% by mass or more, and further may be 37% by mass or more, or 40% by mass or more. In addition, it may also be 100% by mass or less, 95% by mass or less, 90% by mass or less, 85% by mass or less, 80% by mass or less, 75% by mass or less, 70% by mass or less, 65% by mass or less, 60% by mass or less, 55% by mass or less, or 50% by mass or less.

[0133] The water-soluble metal working oil agent according to one aspect of the present invention may further contain other amines (including diamines and polyamines) in addition to alkanolamines and alicyclic amines.

[0134] The content of other amines is based on the total amount (100% by mass) of the component (C) contained in the above-mentioned water-soluble metal working oil agent, and can be set to 0 to 50% by mass, 0 to 40% by mass, 0 to 30% by mass, 0 to 20% by mass, 0 to 10% by mass, 0 to 5.0% by mass, 0 to 2.0% by mass, 0 to 1.0% by mass, 0 to 0.10% by mass, 0 to 0.01% by mass, 0 to 0.001% by mass, 0 to 0.0001% by mass, or 0 to 0.00001% by mass.

[0135] <Component (D): Fatty acids>

[0136] The water-soluble metal working oil agent of one embodiment of the present invention preferably further contains fatty acids (D).

[0137] By containing the component (D), a water-soluble metal working oil agent capable of forming a metal working fluid with further improved emulsion stability, rust prevention property, and workability can be prepared.

[0138] It should be noted that in the water-soluble metal working oil agent of one embodiment of the present invention, the component (D) can be used alone or in combination of two or more.

[0139] From the same viewpoint as above, in the water-soluble metal working oil agent of one embodiment of the present invention, the content of the component (D) is preferably 5 to 70% by mass, more preferably 7 to 60% by mass, further preferably 10 to 50% by mass, still more preferably 13 to 45% by mass, particularly preferably 16 to 40% by mass, based on the total amount (100% by mass) of the water-soluble metal working oil agent excluding water. Furthermore, it can be set to 18% by mass or more, 20% by mass or more, 22% by mass or more, or 25% by mass or more. In addition, it can be set to 38% by mass or less, 35% by mass or less, or 32% by mass or less.

[0140] In addition, from the same viewpoint as above, in the water-soluble metal working oil agent of one embodiment of the present invention, the content of the component (D) is preferably 2 to 60% by mass, more preferably 3 to 50% by mass, further preferably 5 to 40% by mass, still more preferably 7 to 30% by mass, particularly preferably 9 to 25% by mass, based on the total amount (100% by mass) of the water-soluble metal working oil agent. Furthermore, it can be set to 10% by mass or more, 12% by mass or more, or 14% by mass or more. In addition, it can be set to 22% by mass or less, 20% by mass or less, or 18% by mass or less.

[0141] Furthermore, in the water-soluble metal working oil agent of one embodiment of the present invention, the content ratio [(D) / (A1)] of component (D) to component (A1) is preferably 0.01 to 30, more preferably 0.05 to 25, still more preferably 0.10 to 20, further preferably 0.20 to 15, still further preferably 0.25 to 12.0, particularly preferably 0.30 to 8.0, and further may be 0.32 or more, 0.35 or more, 0.50 or more, 0.70 or more, 0.90 or more, 1.00 or more, 1.20 or more, 1.40 or more, or 1.50 or more. In addition, it may also be 7.0 or less, 6.0 or less, 5.0 or less, 4.5 or less, 4.0 or less, 3.8 or less, 3.6 or less, 3.4 or less, 3.2 or less, 3.0 or less, 2.8 or less, 2.6 or less, or 2.4 or less.

[0142] In the water-soluble metal working oil agent of one embodiment of the present invention, from the viewpoint of making the stability of the stock solution of the oil agent good and making a water-soluble metal working oil agent capable of forming a metal working fluid with further improved workability, the content ratio [(C) / (D)] of component (C) to component (D) is preferably 0.01 to 5.0, more preferably 0.05 to 4.0, still more preferably 0.1 to 3.0, further preferably 0.2 to 2.5, still further preferably 0.3 to 2.0, particularly preferably 0.5 to 1.5, and further may be 0.6 or more, 0.65 or more, 0.7 or more, 0.75 or more, or 0.8 or more. In addition, it may also be 1.4 or less, 1.3 or less, 1.2 or less, or 1.15 or less.

[0143] Examples of component (D) used in one embodiment of the present invention include, for example, fatty acids, hydroxy fatty acids, aliphatic dicarboxylic acids, dimer acids of fatty acids, and polymeric fatty acids of hydroxy unsaturated fatty acids.

[0144] Examples of the aforementioned fatty acids include saturated aliphatic monocarboxylic acids such as caprylic acid, 2-ethylhexanoic acid, capric acid, neodecanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, pentadecanoic acid, heptadecanoic acid, nonadecanoic acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, isostearic acid, and unsaturated aliphatic monocarboxylic acids such as octenoic acid, nonenoic acid, decenoic acid, undecenoic acid, oleic acid, elaidic acid, erucic acid, nervonic acid, linoleic acid, γ-linolenic acid, arachidonic acid, α-linolenic acid, octadecatetraenoic acid, eicosapentaenoic acid, and docosahexaenoic acid.

[0145] In addition, it is also possible to use tall oil fatty acid, soybean oil fatty acid, palm oil fatty acid, linseed oil fatty acid, rice bran oil fatty acid, cottonseed oil fatty acid, etc. as mixtures of unsaturated fatty acids.

[0146] As the number of carbon atoms of the aforementioned fatty acid, it is preferably 8 to 30, more preferably 10 to 25, and still more preferably 10 to 20.

[0147] Examples of the aforementioned hydroxy fatty acid include hydroxylated lauric acid, hydroxylated myristic acid, hydroxylated palmitic acid, hydroxylated stearic acid, hydroxylated arachidic acid, hydroxylated behenic acid, hydroxylated oleic acid, etc.

[0148] As the number of carbon atoms of the aforementioned hydroxy fatty acid, it is preferably 8 to 30, more preferably 10 to 25, and still more preferably 10 to 20.

[0149] Examples of the aforementioned aliphatic dicarboxylic acid include saturated aliphatic dicarboxylic acids such as sebacic acid, dodecanedioic acid, dodecyl succinic acid, lauryl succinic acid, stearyl succinic acid, and isostearyl succinic acid.

[0150] As the number of carbon atoms of the aforementioned aliphatic dicarboxylic acid, it is preferably 8 to 30, more preferably 10 to 25, and still more preferably 10 to 20.

[0151] Examples of the hydroxy unsaturated fatty acid that constitutes the polymerized fatty acid of the aforementioned hydroxy unsaturated fatty acid include ricinoleic acid (12-hydroxyoctadec-9-enoic acid), etc. In addition, a fatty acid mixture containing ricinoleic acid such as castor oil can also be used.

[0152] Subsequently, examples of the polymerized fatty acid of the aforementioned hydroxy unsaturated fatty acid include: a condensed fatty acid that is a dehydration condensate of a hydroxy unsaturated fatty acid (for example, a castor oil polymerized fatty acid that is a dehydration condensate of a fatty acid mixture mainly composed of ricinoleic acid), a condensed fatty acid formed by dehydration condensation of the alcoholic hydroxyl group of a condensed fatty acid that is a dehydration condensate of a hydroxy unsaturated fatty acid and a monocarboxylic acid, etc.

[0153] The component (D) used in one aspect of the present invention preferably contains one or more (preferably two or more, more preferably three or more) selected from unsaturated aliphatic monocarboxylic acids, saturated aliphatic dicarboxylic acids, and polymerized fatty acids of hydroxy unsaturated fatty acids, and more preferably contains at least all of the unsaturated aliphatic monocarboxylic acids, saturated aliphatic dicarboxylic acids, and polymerized fatty acids of hydroxy unsaturated fatty acids.

[0154] From the viewpoint of making a water-soluble metal working oil agent for a metal working fluid with further improved processability, the acid value of the component (D) is usually 0 mgKOH / g or more, preferably 10 to 100 mgKOH / g, more preferably 20 to 90 mgKOH / g, and still more preferably 30 to 80 mgKOH / g.

[0155] The hydroxyl value of component (D) is preferably 0 to 80 mgKOH / g, more preferably 0 to 60 mgKOH / g, and still more preferably 0 to 40 mgKOH / g.

[0156] From the above viewpoints, the ratio of the acid value to the hydroxyl value [acid value / hydroxyl value] of component (D) is preferably 1.5 to 15, more preferably 2.0 to 10, and still more preferably 2.5 to 9.5.

[0157] The saponification value of component (D) is preferably 180 to 220 mgKOH / g, more preferably 190 to 210 mgKOH / g, and still more preferably 195 to 205 mgKOH / g.

[0158] It should be noted that in this specification, the acid value means the value measured in accordance with JIS K2501:2003 (indicator photometric titration method), the hydroxyl value means the value measured in accordance with JIS K0070:1992, and the saponification value means the value measured based on JIS K2503:1996.

[0159] <Nonionic surfactant (E)>

[0160] The water-soluble metal working oil agent of one embodiment of the present invention preferably further contains a nonionic surfactant (E). By containing component (E), a water-soluble metal working oil agent capable of forming a metal working fluid with further improved emulsion stability and workability can be prepared.

[0161] It should be noted that in the water-soluble metal working oil agent of one embodiment of the present invention, component (E) can be used alone or in combination of two or more.

[0162] From the above viewpoints, in the water-soluble metal working oil agent of one embodiment of the present invention, the content of component (E) is preferably 0.5 to 35.0% by mass, more preferably 1.0 to 30.0% by mass, still more preferably 1.2 to 25.0% by mass, even more preferably 1.5 to 20.0% by mass, and particularly preferably 1.7 to 16.0% by mass, based on the total amount (100% by mass) of the water-soluble metal working oil agent excluding water.

[0163] It should be noted that when the oil agent is made into an emulsion type classified as type A1 according to JIS K2241:2017, the content of component (E) can be set to 15.0% by mass or less, 12.0% by mass or less, 10.0% by mass or less, 8.0% by mass or less, 6.0% by mass or less, 5.0% by mass or less, 4.0% by mass or less, or 3.5% by mass or less, based on the total amount (100% by mass) of the water-soluble metal working oil agent excluding water. In addition, the lower limit is as described above.

[0164] When the oil agent is a soluble type classified as type A2 according to JIS K2241:2017, the content of component (E) can be set to 2.0% by mass or more, 3.0% by mass or more, 4.0% by mass or more, 5.0% by mass or more, 6.0% by mass or more, 7.0% by mass or more, 8.0% by mass or more, 9.0% by mass or more, or 10.0% by mass or more, based on the total amount (100% by mass) of the water-soluble metal working oil agent excluding water. In addition, the upper limit is as described above.

[0165] From the above viewpoints, in the water-soluble metal working oil agent of one embodiment of the present invention, the content of component (E) is preferably 0.1 to 15.0% by mass, more preferably 0.2 to 12.0% by mass, further preferably 0.3 to 10.0% by mass, still further preferably 0.5 to 8.0% by mass, and particularly preferably 0.7 to 6.0% by mass, based on the total amount (100% by mass) of the water-soluble metal working oil agent.

[0166] It should be noted that when the oil agent is an emulsion type classified as type A1 according to JIS K2241:2017, the content of component (E) can be set to 5.0% by mass or less, 4.5% by mass or less, 4.0% by mass or less, 3.5% by mass or less, 3.0% by mass or less, or 2.5% by mass or less, based on the total amount (100% by mass) of the water-soluble metal working oil agent. In addition, the lower limit is as described above.

[0167] When the oil agent is a soluble type classified as type A2 according to JIS K2241:2017, the content of component (E) can be set to 1.0% by mass or more, 1.2% by mass or more, 1.5% by mass or more, 2.0% by mass or more, 2.5% by mass or more, 3.0% by mass or more, 3.5% by mass or more, or 4.0% by mass or more, based on the total amount (100% by mass) of the water-soluble metal working oil agent. In addition, the upper limit is as described above.

[0168] From the viewpoint of making a water-soluble metal working oil agent capable of forming a metal working fluid with further improved emulsion stability and processability, the HLB of component (E) used in one embodiment of the present invention is preferably 6.0 or more, more preferably 7.0 or more, further preferably 8.0 or more, still further preferably 9.0 or more, and particularly preferably 10.0 or more. In addition, it is 18.0 or less, preferably 17.0 or less, more preferably 16.0 or less, further preferably 15.0 or less, and still further preferably 14.5 or less.

[0169] It should be noted that in this specification, HLB means the value calculated by the Griffin method.

[0170] As the component (E) used in one aspect of the present invention, examples thereof include alkylene glycols, polyoxyalkylene alkyl ethers, polyoxyalkylene aryl ethers, polyoxyalkylene alkylamines (coconut amine alkylene oxide adducts), alkylphenol alkylene oxide adducts, higher alcohol alkylene oxide adducts, polyoxyalkylene fatty acid esters, fatty acid esters of glycerol and pentaerythritol, fatty acid esters of sucrose, fatty acid esters of polyoxyalkylene adducts of polyhydric alcohols, alkyl polyglycosides, fatty acid alkanolamides, and the like.

[0171] Among them, from the viewpoint of preparing a water-soluble metalworking oil agent capable of forming a metalworking fluid with further improved emulsion stability and processability, the component (E) used in one aspect of the present invention preferably contains one or more selected from polyoxyalkylene alkyl ethers and polyoxyalkylene alkylamines.

[0172] The total content ratio of polyoxyalkylene alkyl ether and polyoxyalkylene alkylamine is preferably 50 to 100% by mass, more preferably 70 to 100% by mass, further preferably 80 to 100% by mass, still further preferably 90 to 100% by mass, and particularly preferably 95 to 100% by mass, based on the total amount (100% by mass) of the component (E) contained in the water-soluble metalworking oil agent.

[0173] <Sulfur-based extreme pressure agent>

[0174] Since the water-soluble metalworking oil agent of the present invention contains an oil-soluble PAG (A1) as the base oil (A), it is possible to prepare a metalworking fluid having excellent processability even without containing a sulfur-based extreme pressure agent, which is the main cause of corrosion of copper-containing members. Therefore, from the viewpoint of preparing a water-soluble metalworking oil agent capable of forming a metalworking fluid with a high corrosion inhibition effect on copper-containing members, the water-soluble metalworking oil agent of one aspect of the present invention preferably contains substantially no sulfur-based extreme pressure agent.

[0175] It should be noted that examples of the sulfur-based extreme pressure agent include sulfurized olefins, sulfurized lard, alkyl polysulfides, sulfurized fatty acids, and the like.

[0176] In addition, in this specification, "substantially free of sulfur-based extreme pressure agent" means negating the provision of containing a sulfur-based extreme pressure agent for a specified purpose, rather than negating the provision of inadvertently mixing and containing a sulfur-based extreme pressure agent as an impurity of other components. However, even considering such an inadvertent mixing of a sulfur-based extreme pressure agent, from the viewpoint of preparing a water-soluble metalworking oil agent capable of forming a metalworking fluid with a high corrosion inhibition effect on copper-containing members, the content of the sulfur-based extreme pressure agent is preferably as small as possible.

[0177] The content of the specific sulfur-based extreme pressure agent is preferably less than 10 parts by mass, more preferably less than 1 part by mass, further preferably less than 0.1 part by mass, still further preferably less than 0.01 part by mass, and particularly preferably less than 0.001 part by mass, relative to 100 parts by mass of the total amount of the component (A1) contained in the aforementioned water-soluble metal working oil agent.

[0178] <Various other additives>

[0179] The water-soluble metal working oil agent according to one embodiment of the present invention may further contain various other additives other than the above components (A) to (E) as needed within a range not impairing the effects of the present invention.

[0180] Examples of such various other additives include, for example, anionic surfactants, cationic surfactants, petroleum sulfonates, extreme pressure agents other than sulfur-based ones, metal passivators, emulsification aids, antibacterial agents, defoamers, antioxidants, oiliness agents, and the like.

[0181] It should be noted that these various additives can be used alone or in combination of two or more.

[0182] It should be noted that in the water-soluble metal working oil agent according to one embodiment of the present invention, the respective contents of these various additives can be appropriately set according to the types and functions of the respective components. Based on the total amount (100% by mass) of the water-soluble metal working oil agent excluding water, it is preferably 0.001 to 50% by mass, more preferably 0.01 to 40% by mass, further preferably 0.07 to 30% by mass, and still further preferably 0.1 to 20% by mass.

[0183] It should be noted that in the water-soluble metal working oil agent according to one embodiment of the present invention, the respective contents of these various additives can be appropriately set according to the types and functions of the respective components. Based on the total amount (100% by mass) of the water-soluble metal working oil agent, it is preferably 0.001 to 25% by mass, more preferably 0.01 to 20% by mass, further preferably 0.03 to 15% by mass, and still further preferably 0.05 to 10% by mass.

[0184] Examples of the anionic surfactant include, for example, polyoxyethylene alkyl ether carboxylic acid, polyoxyethylene alkyl ether phosphoric acid, alkylbenzene sulfonic acid, α-olefin sulfonic acid, and their salts.

[0185] It should be noted that the acid value of the anionic surfactant is preferably 20 to 250 mgKOH / g, more preferably 30 to 200 mgKOH / g, further preferably 40 to 190 mgKOH / g, and still further preferably 50 to 180 mgKOH / g.

[0186] Examples of the cationic surfactant include, for example, alkyltrimethylammonium salts, dialkyldimethylammonium salts, alkyldimethylbenzylammonium salts, and the like.

[0187] Examples of the petroleum sulfonate include, for example, calcium sulfonate, sodium sulfonate, magnesium sulfonate, and the like.

[0188] Examples of the extreme pressure agent other than the sulfur type include, for example, chlorine type extreme pressure agents such as chlorinated paraffin, chlorinated fatty acid, and chlorinated fatty oil; phosphorus type extreme pressure agents such as phosphate ester, phosphite ester, thiophosphate ester, and their salts, phosphine type, and tricresyl phosphate; and the like.

[0189] Examples of the metal deactivator include, for example, benzotriazole, imidazoline, pyrimidine derivatives, and thiadiazole.

[0190] Examples of the emulsification aid include, for example, unsaturated fatty acid esters such as methyl oleate, ethyl oleate, and propyl oleate; aromatic alcohols such as 2-phenoxyethanol and 2-phenylethanol; and the like.

[0191] Examples of the antibacterial agent include, for example, isothiazoline-based compounds, triazine-based compounds, alkylbenzimidazole-based compounds, and metal pyridinethione salts.

[0192] Examples of the defoamer include, for example, silicone-based defoamers, fluorinated silicone-based defoamers, polyacrylates, and the like.

[0193] Examples of the antioxidant include, for example, amine-based antioxidants such as alkylated diphenylamine, phenylnaphthylamine, and alkylated phenylnaphthylamine; phenolic antioxidants such as 2,6-di-tert-butylphenol, 4,4'-methylenebis(2,6-di-tert-butylphenol), isooctyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and n-octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; and the like.

[0194] Examples of the oiliness agent include, for example, alcohols such as lauryl alcohol, myristyl alcohol, palmityl alcohol, stearyl alcohol, and oleyl alcohol.

[0195] <Method for producing water-soluble metal working oil agent>

[0196] The method for producing the water-soluble metal working oil agent according to one embodiment of the present invention is not particularly limited, and a method having a step of blending the above component (A) and, if necessary, blending components (B) to (E) and various other additives is preferred. The blending order of each component can be appropriately set.

[0197] 〔Properties of water-soluble metal working oil agent〕

[0198] The acid value of the water-soluble metal working oil agent of one embodiment of the present invention is preferably 10 to 70 mgKOH / g, more preferably 15 to 60 mgKOH / g, still more preferably 20 to 50 mgKOH / g, and even more preferably 25 to 40 mgKOH / g.

[0199] The base number of the water-soluble metal working oil agent of one embodiment of the present invention is preferably 10 to 100 mgKOH / g, more preferably 20 to 90 mgKOH / g, still more preferably 30 to 80 mgKOH / g, and even more preferably 40 to 70 mgKOH / g.

[0200] It should be noted that in this specification, the base number means the value measured in accordance with JIS K2501:2003 (hydrochloric acid method).

[0201] The ratio of the base number to the acid value [base number / acid value] of the water-soluble metal working oil agent of one embodiment of the present invention is preferably 1.0 to 4.0, more preferably 1.1 to 3.5, still more preferably 1.3 to 3.2, even more preferably 1.5 to 3.0, and particularly preferably 1.7 to 2.8.

[0202] If the ratio is 1.0 or more, a water-soluble metal working oil agent with good anti-corrosion properties can be prepared. On the other hand, if the ratio is 4.0 or less, the irritation to the human skin can be reduced, which is preferable in terms of operability.

[0203] 〔Form of metal working fluid〕

[0204] The metal working fluid of the present invention is prepared by using the metal working oil agent of one embodiment of the present invention as the stock solution and adding dilution water thereto.

[0205] As the dilution water, for example, any one of distilled water, ion-exchanged water, tap water, industrial water, etc. can be used.

[0206] The blending amount of the dilution water when preparing the metal working fluid is more than 400 parts by mass with respect to 100 parts by mass of the total amount of the components other than water in the above-mentioned water-soluble metal working oil agent, and it is preferably adjusted appropriately to the desired dilution concentration.

[0207] As the dilution concentration of the metal working fluid of one embodiment of the present invention, it is preferably 1 to 50% by volume, more preferably 3 to 40% by volume, and still more preferably 5 to 20% by volume.

[0208] It should be noted that in this specification, the above-mentioned "dilution concentration of the metal working fluid" means the value calculated by the following formula.

[0209] · "Dilution concentration (volume %) of metalworking fluid" = [Volume of metalworking oil agent before dilution] / ([Volume of metalworking oil agent before dilution] + [Volume of dilution water]) × 100

[0210] 〔Use of metalworking fluid, metalworking method〕

[0211] Compared with conventional metalworking fluids, the metalworking fluid of a preferred embodiment of the present invention has excellent workability and can be suitably used for metalworking. In addition, the metalworking fluid of a preferred embodiment of the present invention can exhibit excellent workability even without a sulfur-based extreme pressure agent. Therefore, corrosion of copper-containing components constituting the processing equipment, which is mainly caused by the sulfur-based extreme pressure agent, can be effectively suppressed.

[0212] The workpiece material processed using the metalworking fluid of an embodiment of the present invention is not particularly limited, and is particularly suitable for workpiece materials containing metals selected from iron, titanium, aluminum, titanium alloys, alloy steels, nickel-based alloys, niobium alloys, tantalum alloys, molybdenum alloys, tungsten alloys, stainless steels, aluminum alloys, and high manganese steels. Among them, workpiece materials having components containing at least iron or aluminum are particularly suitable.

[0213] Therefore, the present invention can also provide the following 〔1〕 and 〔2〕.

[0214] 〔1〕 A method of use, which applies the metalworking fluid of an embodiment of the present invention to the processing of a workpiece material containing metal.

[0215] 〔2〕 A metalworking method, which applies the metalworking fluid of an embodiment of the present invention to process a workpiece material containing metal.

[0216] As described above, for the workpiece materials described in the above 〔1〕 and 〔2〕, workpiece materials having components containing at least iron or aluminum are preferred.

[0217] In addition, according to the methods described in the above 〔1〕 and 〔2〕, corrosion of copper-containing components constituting the processing equipment for processing the aforementioned workpiece material can be suppressed.

[0218] In the above 〔1〕 and 〔2〕, examples of the processing of the workpiece material include, for example, cutting, grinding, blanking, lapping, deep drawing, stretching, rolling, etc.

[0219] It should be noted that in the above usage method of [1] and the metal processing method of [2], the metal working fluid is supplied to the workpiece after diluting water is mixed into the water-soluble metal working oil agent of one embodiment of the present invention, and is used by bringing it into contact with the workpiece. The metal working fluid lubricates between the workpiece and the cutting tool. Further, it is also used for chip removal, rust prevention of the workpiece, cooling of the tool and the workpiece, etc.

[0220] Examples

[0221] Hereinafter, the present invention will be described in more detail by way of examples, and the present invention is not limited by any of these examples.

[0222] It should be noted that in the following examples, the measurement methods and calculation methods of the following physical property values are as follows.

[0223] (1) Kinematic viscosity, viscosity index

[0224] Measured and calculated in accordance with JIS K2283:2000.

[0225] (2) HLB

[0226] Calculated based on the Griffin method.

[0227] (3) Acid value (indicator photometric titration method)

[0228] Measured in accordance with JIS K2501:2003 (indicator photometric titration method).

[0229] (4) Base number (hydrochloric acid method)

[0230] Measured in accordance with JIS K2501:2003 (hydrochloric acid method).

[0231] Examples 1 to 8, Comparative Examples 1 to 4

[0232] Various components of the types shown in Tables 2 and 3 were added and mixed in the blending amounts shown in Tables 2 and 3 to prepare water-soluble metal working oil agents respectively. The specific details of each component used in the preparation of the water-soluble metal working oil agent are as described below.

[0233] <Component (A1)>

[0234] · Oil-soluble PAG (a-1): An oil-soluble polyalkylene glycol having a viscosity grade VG32 conforming to ISO 3448.

[0235] · Oil-soluble PAG (a-2): An oil-soluble polyalkylene glycol having a viscosity grade VG46 conforming to ISO 3448.

[0236] · Oil-soluble PAG (a-3): An oil-soluble polyalkylene glycol conforming to the viscosity grade VG68 specified in ISO 3448.

[0237] <Component (A2)>

[0238] · Paraffinic mineral oil: Paraffinic mineral oil with a kinematic viscosity at 40 °C = 7.117 mm 2 / s and a viscosity index = 109.

[0239] <Component (B)>

[0240] · Water: Ion-exchanged water

[0241] <Component (C)>

[0242] · Amine (c-1): N-Methylethanolamine, secondary monoamine

[0243] · Amine (c-2): N-Cyclohexyldiethanolamine, tertiary monoamine

[0244] · Amine (c-3): N-Methyldiethanolamine, tertiary monoamine

[0245] · Amine (c-4): Triisopropanolamine, tertiary monoamine

[0246] · Amine (c-5): N-Methyldicyclohexylamine, tertiary monoamine

[0247] <Component (D)>

[0248] · Fatty acids (d-1): Neo-decanoic acid

[0249] · Fatty acids (d-2): Tall oil fatty acid

[0250] · Fatty acids (d-3): Dodecanedioic acid

[0251] · Fatty acids (d-4): Polymerized castor oil fatty acid (hexamer of ricinoleic acid, acid value: 31.6 mg KOH / g, hydroxyl value: 9.4 mg KOH / g, acid value / hydroxyl value = 3.36)

[0252] <Component (E)>

[0253] · Non-ionic surfactant (e-1): Coconut amine ethylene oxide 2-mole adduct, HLB = 6.3

[0254] · Non-ionic surfactant (e-2): Polyoxyalkylene alkyl ether, HLB = 12.7

[0255] <Sulfur-based extreme pressure agent>

[0256] · Dioctyl polysulfide

[0257] <Other components>

[0258] · Anionic surfactant: Polyoxyethylene oleyl ether carboxylic acid, acid value = 69.3 mgKOH / g.

[0259] · Metal deactivator: Benzotriazole

[0260] · Emulsification aid: 2-Phenoxyethanol

[0261] · Antibacterial agent: 1,2-Benzisothiazolin-3-one

[0262] · Defoaming agent: Silicone-based defoaming agent

[0263] The acid value, base value, and base value / acid value ratio of the prepared water-soluble metal working oil were measured and calculated, and the following evaluations were carried out using this water-soluble metal working oil. The results are shown in Tables 2 and 3.

[0264] (1) Classification of oil agent types

[0265] According to the provisions of JIS K2241:2017, it is classified as an emulsion-type oil agent of type A1 or a soluble-type oil agent of type A2 with the same provisions. It should be noted that in Tables 2 and 3, when it is classified as an emulsion-type oil agent of type A1, it is recorded as "E", and when it is classified as a soluble-type oil agent of type A2, it is recorded as "S".

[0266] (2) Copper plate corrosion test

[0267] Using the test method based on JIS K2513, the test was carried out under the conditions of an oil temperature of 50 °C for 48 hours, and the discoloration degree of the copper plate was observed. Based on the "Table 1 Corrosion Classification Based on Copper Plate Corrosion Standards" of JIS K2513 shown in Table 1 below, the corrosion degree of the copper plate was evaluated. It should be noted that in Tables 2 and 3, it is recorded as "discoloration number (subdivision mark)", and the discoloration number represents the corrosion degree of the copper plate with a numerical value from 1 to 4. The larger the numerical value, the more the corrosion progresses.

[0268] [Table 1]

[0269] Table 1

[0270]

[0271] (3) Evaluation of workability

[0272] Ion-exchanged water was added to the water-soluble metal working oil for dilution to prepare a metal working fluid with a dilution concentration of 5% by volume. Using the prepared metal working fluid, after pre-drilling under the following conditions, a tapping torque test was carried out to measure the maximum tapping torque during processing. The measurement was carried out 3 times, and the average value and maximum value of the results were recorded in Tables 2 and 3.

[0273] The smaller the average value and the maximum value are, the more excellent the metal workability of the metal working fluid used can be said to be.

[0274] <Pre-drilling conditions>

[0275] · Machine used: Tapping center MTV-T350 (manufactured by Mectron Co., Ltd.)

[0276] · Drill bit: SG-ESS (manufactured by Nachi-Fujikoshi Corp.), drill bit diameter: 5.56 mm

[0277] · Cutting speed: 31 m / min

[0278] · Rotation speed: 1798 min -1

[0279] · Feed rate: 260 mm / min

[0280] · Feed per revolution: 0.145 mm / rev

[0281] · Depth: 15 mm

[0282] <Tapping torque test>

[0283] · Testing machine used: Megatap II (micro-electronische Gerate GmbH)

[0284] · Tapping: New type roller tapping VP-NRT B M6×1 (manufactured by Ohkoshi Co., Ltd.)

[0285] · Cutting speed: 10 m / min

[0286] · Feed rate: 1.0 mm / rev

[0287] · Depth: 12 mm

[0288] · Number of machining n: 3

[0289] · Workpiece material: SCM440 (JIS standard) (chrome molybdenum steel)

[0290] [Table 2]

[0291] Table 2

[0292]

[0293] [Table 3]

[0294] Table 3

[0295]

[0296] As can be seen from Table 2 and Table 3, for the metalworking fluids prepared by diluting the water-soluble metalworking oil agents of Examples 1 to 8, whether they are soluble type or emulsion type, the copper plate corrosion is inhibited and the workability is also good. On the other hand, for the metalworking fluids prepared by diluting the water-soluble metalworking oil agents of Comparative Examples 1 to 4, the results show that at least one of the inhibition effect of copper plate corrosion and the workability is poor.

Claims

1. A water-soluble metalworking oil agent containing a base oil (A) comprising an oil-soluble polyalkylene glycol (A1), wherein component (A1) is a homopolymer of propylene oxide or a homopolymer of butylene oxide, The total content of the water-soluble polyalkylene glycol and methoxypolyethylene glycol is less than 5% by mass based on the total amount excluding water, The total content of the water-soluble polyalkylene glycol and methoxypolyethylene glycol is less than 10 parts by mass relative to 100 parts by mass of the total amount of component (A1), The content ratio of component (A1) in component (A) is 10 to 100% by mass based on the total amount of component (A) contained in the water-soluble metalworking oil agent, The viscosity grade of component (A1) specified by ISO 3448 is VG10, VG15, VG22, VG32 or VG46, It further contains water (B), an amine compound (C), fatty acids (D) and a nonionic surfactant (E), The content ratio [(C) / (A1)] of component (C) to component (A1) is 0.25 to 9.0 in terms of mass ratio, The content ratio [(D) / (A1)] of component (D) to component (A1) is 0.30 to 8.0 in terms of mass ratio, The content of component (E) is 0.5 to 35.0% by mass based on the total amount of the water-soluble metalworking oil agent excluding water, The water-soluble metalworking oil agent substantially does not contain a sulfur-based extreme pressure agent.

2. The water-soluble metal working oil agent according to claim 1, wherein, The total content of the water-soluble polyalkylene glycol and methoxypolyethylene glycol is less than 5 parts by mass relative to 100 parts by mass of the total amount of component (A1).

3. The water-soluble metal working oil agent according to claim 1, wherein The total content of the water-soluble polyalkylene glycol and methoxypolyethylene glycol is less than 0.1 part by mass relative to 100 parts by mass of the total amount of component (A1).

4. The water-soluble metalworking oil agent according to claim 1 or 2, which substantially does not contain a sulfur-based extreme pressure agent, and the content of the sulfur-based extreme pressure agent is less than 10 parts by mass relative to 100 parts by mass of the total amount of component (A1) contained in the aforementioned water-soluble metalworking oil agent.

5. The water-soluble metal working oil agent according to claim 1 or 2, wherein, The content of component (B) is 1 to 99% by mass based on the total amount of the water-soluble metalworking oil agent.

6. The water-soluble metal working oil agent according to claim 1 or 2, wherein, The content of component (B) is 10% by mass or more based on the total amount of the water-soluble metalworking oil agent.

7. The water-soluble metal working oil agent according to claim 1 or 2, wherein The content of component (B) is 20% by mass or more based on the total amount of the water-soluble metalworking oil agent.

8. The water-soluble metal working oil agent according to claim 1 or 2, wherein The contents of component (A) and component (B) are 20% by mass or more based on the total amount of the water-soluble metalworking oil agent.

9. The water-soluble metalworking oil agent according to claim 1 or 2, wherein, The contents of component (A) and component (B) are 50% by mass or more based on the total amount of the water-soluble metalworking oil agent.

10. The water-soluble metal working oil agent according to claim 1 or 2, wherein, The content ratio of component (A1) in component (A) is 90 to 100% by mass based on the total amount of component (A) contained in the water-soluble metalworking oil agent.

11. The water-soluble metal working oil agent according to claim 1 or 2, wherein, The content of component (A1) is 0.01% by mass or more based on the total amount of the water-soluble metalworking oil agent excluding water.

12. The water-soluble metal working oil agent according to claim 1 or 2, wherein, The content of component (A1) is 1.0% by mass or more based on the total amount of the water-soluble metalworking oil agent excluding water.

13. The water-soluble metal working oil agent according to claim 1 or 2, wherein, The viscosity grade of component (A1) specified in ISO 3448 is VG22, VG32, or VG46.

14. The water-soluble metal working oil agent according to claim 1 or 2, wherein The viscosity grade of component (A1) specified in ISO 3448 is VG32 or VG46.

15. The water-soluble metal working oil agent according to claim 1 or 2, wherein, The content of component (C) is 3 to 70% by mass based on the total amount of the water-soluble metalworking oil agent excluding water.

16. The water-soluble metal working oil agent according to claim 1 or 2, wherein, The content ratio of the monoamine is 50 to 100% by mass based on the total amount of component (C) contained in the water-soluble metalworking oil agent.

17. The water-soluble metal working oil agent according to claim 1 or 2, wherein, Component (C) contains alicyclic amines.

18. The water-soluble metal working oil agent according to claim 1 or 2, wherein, Component (C) contains one or more selected from dialkylmonocyclohexylamine and monoalkyldicyclohexylamine.

19. The water-soluble metal working oil agent according to claim 1 or 2, wherein, Component (C) contains one or more selected from monocyclohexyldialkanolamine and dicyclohexylalkanolamine.

20. The water-soluble metalworking oil agent according to claim 1 or 2, wherein, The content of component (D) is 5 to 70% by mass based on the total amount of the water-soluble metalworking oil agent excluding water.

21. The water-soluble metal working oil agent according to claim 1 or 2, wherein, The content ratio of component (C) to component (D) [(C) / (D)] is 0.01 to 5.0 in terms of mass ratio.

22. The water-soluble metal working oil agent according to claim 1 or 2, wherein, Component (D) contains at least a polymerized fatty acid of all unsaturated aliphatic monocarboxylic acids, saturated aliphatic dicarboxylic acids, and hydroxy unsaturated fatty acids.

23. The water-soluble metal working oil agent according to claim 1 or 2, wherein, The content of component (E) is 1.0 to 30.0% by mass based on the total amount of the water-soluble metalworking oil agent excluding water.

24. The water-soluble metal working oil agent according to claim 1 or 2, wherein, The ratio of the base number to the acid number [base number / acid number] of the water-soluble metalworking oil agent is 1.0 to 4.

0.

25. The water-soluble metalworking oil agent according to claim 1 or 2, which is an emulsion-type oil agent classified as type A1 specified in JIS K2241:2017.

26. The water-soluble metalworking oil agent according to claim 1 or 2, which is a soluble-type oil agent classified as type A2 specified in JIS K2241:2017.

27. A metalworking fluid, which is prepared by mixing dilution water with the water-soluble metalworking oil agent according to any one of claims 1 to 26.

28. A metalworking method, which uses the metalworking fluid according to claim 27 to process a work material containing metal.

29. The metal processing method according to claim 28, wherein, The work material has a member containing at least iron or aluminum.

30. The metalworking method according to claim 28 or 29, which inhibits corrosion of the copper-containing member constituting the processing equipment for processing the work material.

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