Metalworking fluid composition

Abstract

To provide a metalworking fluid composition with good workability. [Solution] Contains a base oil (A), and the base oil (A) is 1 A metalworking oil composition comprising a branched-chain hydrocarbon (A1) in which the proton ratio of methyl groups is 20 or more and 50 or less, when the integral value of all protons detected by H-NMR analysis is set to 100, and a mineral oil (A2) in which the proton ratio of methyl groups is less than 20 or greater than 50, wherein the content of the branched-chain hydrocarbon (A1) is 3% by mass or more with respect to the total amount of the base oil (A).

Description

[Technical Field]

[0001] This invention relates to a metalworking fluid composition. [Background technology]

[0002] Traditionally, in the field of metalworking, metalworking fluid compositions have been used to lubricate the workpieces of metal workpieces. These metalworking fluid compositions require excellent workability, such as suppressing seizing between the workpiece and the tool.

[0003] For example, Patent Document 1 discloses an aluminum processing oil base oil in which the difference between the 5% distillation temperature and the initial boiling point (5% distillation temperature - initial boiling point), determined by the atmospheric pressure method of JIS K 2254, is 13°C or less, the difference between the endpoint and the 95% distillation temperature (endpoint - 95% distillation temperature), determined by the atmospheric pressure method of JIS K 2254, is 15°C or less, the surface tension at 25°C determined by the method of JIS K 2241 is 28 mN / m or less, and the kinematic viscosity at 40°C is 1.5 mm² / s or more and 7.0 mm² / s or less. It is disclosed that using this aluminum processing oil base oil can further suppress the occurrence of stains during aluminum processing. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2021-147415 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] Conventional metalworking fluid compositions, such as those described in Patent Document 1, have room for improvement in terms of workability.

[0006] The present invention has been made in view of the above circumstances, and aims to provide a metalworking oil composition with good workability. [Means for solving the problem]

[0007] To solve the above problems, the present invention employs the following configuration. [1] Contains base oil (A), said base oil (A) 1 A metalworking oil composition comprising a branched-chain hydrocarbon (A1) in which the proton ratio of methyl groups is 20 or more and 50 or less, when the integral value of all protons detected by H-NMR analysis is set to 100, and a mineral oil (A2) in which the proton ratio of methyl groups is less than 20 or greater than 50, wherein the content of the branched-chain hydrocarbon (A1) is 3% by mass or more with respect to the total amount of the base oil (A). [2] The metalworking oil composition according to [1], wherein the branched chain hydrocarbon (A1) has a volume ratio (CB / CA) of 0.4 or more between the proportion of hydrocarbon with the most abundant number of carbon atoms (CA) and the proportion of hydrocarbon with the second most abundant number of carbon atoms (CB) in the carbon number distribution obtained by gas chromatographic distillation. [3] The metalworking oil composition according to [1] or [2], wherein the molecular weight of the branched-chain hydrocarbon (A1) is 86 or more and 310 or less. [4] A metalworking oil composition according to any one of items [1] to [3], used for rolling metals. [Effects of the Invention]

[0008] According to the present invention, a metalworking fluid composition with good workability can be provided. [Modes for carrying out the invention]

[0009] (Metalworking oil composition) The metalworking oil composition of this embodiment contains a base oil (A), and the base oil (A) is 1 This includes branched-chain hydrocarbons (A1) in which the proton ratio of methyl groups is between 20 and 50, with the integrated value of all protons detected by 1H-NMR analysis set to 100, and mineral oils (A2) in which the proton ratio of methyl groups is less than 20 or greater than 50.

[0010] The kinematic viscosity of the metalworking oil composition of this embodiment at 40°C is 1.0 mm2 It is preferably at least / s, and 1.1 mm 2 More preferably, it is at least / s, and 1.2 mm 2 Even more preferably, it is at least / s, and 1.3 mm 2 Particularly preferably, it is at least / s. The kinematic viscosity at 40°C of the metalworking oil composition of the present embodiment is preferably 7.0 mm 2 or less, and 6.5 mm 2 More preferably, it is 6.0 mm or less 2 Even more preferably, it is 5.5 mm or less 2 Particularly preferably, it is 5.5 mm or less. For example, the kinematic viscosity at 40°C of the metalworking oil composition of the present embodiment is 1.0 mm 2 or more and 7.0 mm 2 or less, preferably 1.1 mm 2 or more and 6.5 mm 2 More preferably, it is 1.2 mm or more and 6.0 mm 2 or less, even more preferably 1.3 mm 2 or more and 6.0 mm 2 or less, and particularly preferably 1.3 mm 2 or more and 5.5 mm or less.

[0011] When the kinematic viscosity at 40°C of the metalworking oil composition of the present embodiment is within the above preferable range, the workability is further improved.

[0012] Unless otherwise specified, the kinematic viscosity at 40°C in this specification means the kinematic viscosity at 40°C measured in accordance with JIS K2283:2000.

[0013] <Branched hydrocarbon (A1)> The branched hydrocarbon (A1) 1 When the integral value of all protons detected by 1H-NMR analysis is set to 100, the proton ratio of the methyl group is 20 or more and 50 or less.

[0014] The proton ratio of the methyl group of the branched-chain hydrocarbon (A1) is 50 or less, preferably 45 or less, more preferably 40 or less, and even more preferably 35 or less. The proton ratio of the methyl group of the branched-chain hydrocarbon (A1) is 20 or more, preferably 22 or more, and more preferably 25 or more.

[0015] When the proton ratio of the methyl group of the branched-chain hydrocarbon (A1) is less than 20, that is, when the branching of the base oil is less, it is presumed that a plurality of molecules of the base oil are densely stacked and the additives used are less likely to adsorb onto the surface of the workpiece. On the other hand, when the proton ratio of the methyl group of the branched-chain hydrocarbon (A1) exceeds 65, that is, when the branching of the base oil is more, it is presumed that the gaps between a plurality of molecules of the base oil decrease and the additives used are less likely to adsorb onto the surface of the workpiece. When the proton ratio of the methyl group of the branched-chain hydrocarbon (A1) is within the above-preferred numerical range, that is, when the branching of the branched-chain hydrocarbon (A1) is appropriate, a plurality of molecules of the branched-chain hydrocarbon (A1) become uneven, the gaps between a plurality of molecules of the branched-chain hydrocarbon (A1) increase, and it is presumed that the additives used are more likely to adsorb onto the surface of the workpiece. Therefore, when the proton ratio of the methyl group of the branched-chain hydrocarbon (A1) is within the above-preferred numerical range, the workability is improved.

[0016] For example, in the branched-chain hydrocarbon (A1), the proton ratio of the methyl group is preferably 20 or more and 50 or less, more preferably 22 or more and 45 or less, and even more preferably 25 or more and 40 or less.

[0017] 1 The measuring device and measuring conditions during 1H-NMR measurement are as follows. Measuring device: AVANCE III HD-cryo600 type NMR manufactured by Bruker 1 1H resonance frequency: 600.18 MHz Solvent: CDCl3 Concentration: Approximately 50mg / mL Measurement method: 1 H Non-Decoupling Method Pulse width: 30° pulse Waiting time: 5 seconds Chemical shift standard: CHCl3 in CDCl3 (7.28 ppm)

[0018] The branched-chain hydrocarbon (A1) preferably has a flash point of 70°C or higher, and more preferably 75°C or higher. There is no particular upper limit to the flash point, but for example it may be less than 200°C, 180°C or lower, or 150°C or lower.

[0019] Branched-chain hydrocarbons (A1) are highly safe because they have a flash point of 70°C or higher. Safety is further enhanced if the flash point of the base oil for the metalworking oil composition in this embodiment is above the preferred lower limit mentioned above.

[0020] In this specification, the flash point of branched-chain hydrocarbons (A1) refers to the value measured by the Pennke-Haltens cloacal method as defined in JIS K2265-3:2007.

[0021] The branched-chain hydrocarbon (A1) is preferably a branched-chain hydrocarbon having 6 to 20 carbon atoms, and more preferably a branched-chain hydrocarbon having 6 to 18 carbon atoms. The carbon number mentioned refers to the carbon number obtained by gas chromatography distillation, which will be described later.

[0022] In branched-chain hydrocarbons (A1), the ratio (CB / CA) of the proportion of hydrocarbons with the most abundant number of carbon atoms (CA) to the proportion of hydrocarbons with the second most abundant number of carbon atoms (CB) is preferably 0.4 or higher, more preferably 0.5 or higher, even more preferably 0.6 or higher, and particularly preferably 0.7 or higher.

[0023] The parameters of the branched hydrocarbon (A1) described above can be controlled by distillation while precisely adjusting the pressure, temperature, reflux ratio, or the number of stages in the distillation column during the production of the branched hydrocarbon (A1).

[0024] The molecular weight of the branched-chain hydrocarbon (A1) is preferably 86 or higher, more preferably 100 or higher, and even more preferably 114 or higher. The molecular weight of the branched-chain hydrocarbon (A1) is preferably 310 or less, more preferably 296 or less, and even more preferably 282 or less. For example, the molecular weight of the branched-chain hydrocarbon (A1) is preferably 86 to 310, more preferably 100 to 296, and even more preferably 114 to 282.

[0025] If the molecular weight of the branched-chain hydrocarbon (A1) is within the above preferred range, the processability is further improved.

[0026] The branched-chain hydrocarbon (A1) may be used alone or as a mixture of two or more types.

[0027] The content of branched-chain hydrocarbons (A1) is 3% by mass or more, preferably 5% by mass or more, more preferably 7% by mass or more, even more preferably 10% by mass or more, and particularly preferably 20% by mass or more, based on the total amount of base oil (A). The content of branched-chain hydrocarbons (A1) is preferably 95% by mass or less, more preferably 90% by mass or less, and even more preferably 80% by mass or less, relative to the total amount of base oil (A). For example, the content of branched-chain hydrocarbons (A1) is preferably 3% by mass or more and 95% by mass or less, more preferably 5% by mass or more and 95% by mass or less, even more preferably 7% by mass or more and 95% by mass or less, particularly preferably 10% by mass or more and 90% by mass or less, and most preferably 20% by mass or more and 80% by mass or less, based on the total amount of base oil (A).

[0028] When the branched-chain hydrocarbon (A1) content is 3% by mass or more relative to the total amount of base oil (A), the processability is improved. Furthermore, when the branched-chain hydrocarbon (A1) content is within the above preferred range, the processability is further improved.

[0029] <Mineral oil (A2)> Mineral oil (A2) is mineral oil in which the proton ratio of methyl groups is less than 20 or greater than 50.

[0030] If the proton ratio of the methyl group in mineral oil (A2) is less than 20, it is preferably 18 or less, more preferably 17 or less, and even more preferably 16.5 or less. If the proton ratio of the methyl group in mineral oil (A2) is less than 20, it is preferably 10 or more, more preferably 12 or more, and even more preferably 15 or more.

[0031] If the proton ratio of the methyl group in mineral oil (A2) is greater than 50, it is preferably 51 or higher, more preferably 52 or higher, and even more preferably 54 or higher. If the proton ratio of the methyl group in mineral oil (A2) is greater than 50, it is preferably 70 or less, more preferably 65 or less, and even more preferably 60 or less.

[0032] For example, if the proton ratio of the methyl group in mineral oil (A2) is less than 20, it is preferably 10 to 18, more preferably 12 to 17, and even more preferably 15 to 16.5. For example, if the proton ratio of the methyl group in mineral oil (A2) is greater than 50, it is preferably 51 to 70, more preferably 52 to 65, and even more preferably 54 to 60.

[0033] Specifically, examples of mineral oil (A2) include paraffinic or naphthenic mineral oils obtained by applying one or more refining methods such as solvent delamination, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid washing, and clay treatment to a lubricating oil fraction obtained by atmospheric distillation and vacuum distillation of crude oil.

[0034] From the viewpoint of the working environment, the aromatic content of mineral oil (A2) is preferably 10% by volume or less, more preferably 5% by volume or less, even more preferably 3% by volume or less, particularly preferably 1% by volume or less, and most preferably 0.5% by volume or less. Here, aromatic content refers to the value measured in accordance with the fluorescent indicator adsorption method of JIS K2536 "Petroleum Products - Hydrocarbon Type Test".

[0035] The lower limit of the aromatic content of mineral oil (A2) is not particularly limited, for example, 0.1% by volume or more. However, the aromatic content of mineral oil (A2) may be below the detection limit.

[0036] The initial boiling point of the mineral oil (A2) is preferably 230°C or higher, more preferably 235°C or higher, and even more preferably 240°C or higher. The initial boiling point of the mineral oil (A2) is preferably 255°C or lower, more preferably 250°C or lower, and even more preferably 245°C or lower. For example, the initial boiling point of mineral oil (A2) is preferably 230°C or higher and 255°C or lower, more preferably 235°C or higher and 250°C or lower, and even more preferably 240°C or higher and 245°C or lower.

[0037] The endpoint of mineral oil (A2) is preferably 245°C or higher, more preferably 250°C or higher, and even more preferably 255°C or higher. The endpoint of the mineral oil (A2) is preferably 270°C or lower, more preferably 265°C or lower, and even more preferably 260°C or lower. For example, the endpoint of mineral oil (A2) is preferably 245°C to 270°C, more preferably 250°C to 265°C, and even more preferably 255°C to 260°C.

[0038] In this specification, the initial boiling point and endpoint of mineral oil (A2) refer to values ​​measured in accordance with the atmospheric pressure method of JIS K 2254.

[0039] Mineral oil (A2) may be used alone or in a mixture of two or more types.

[0040] The mineral oil (A2) content is preferably 5% by mass or more, more preferably 10% by mass or more, and even more preferably 20% by mass or more, relative to the total amount of base oil (A). The mineral oil (A2) content is 97% by mass or less, preferably 95% by mass or less, more preferably 93% by mass or less, even more preferably 90% by mass or less, and particularly preferably 80% by mass or less, based on the total amount of base oil (A). For example, the mineral oil (A2) content is preferably 5% by mass or more and 97% by mass or less, more preferably 5% by mass or more and 95% by mass or less, even more preferably 5% by mass or more and 93% by mass or less, particularly preferably 10% by mass or more and 90% by mass or less, and most preferably 20% by mass or more and 80% by mass or less, based on the total amount of base oil (A).

[0041] When the mineral oil (A2) content is 97% by mass or less relative to the total amount of base oil (A), the processability improves. Furthermore, when the mineral oil (A2) content is within the above preferred range, the processability improves even more.

[0042] Base oil (A) may be used alone or as a mixture of two or more types.

[0043] The base oil (A) content is preferably 85% by mass or more, more preferably 90% by mass or more, and even more preferably 92% by mass or more, based on the total amount of the metalworking oil composition of this embodiment. The base oil (A) content is preferably 99% by mass or less, more preferably 98% by mass or less, and even more preferably 95% by mass or less, based on the total amount of the metalworking oil composition of this embodiment. For example, the base oil (A) content is preferably 85% by mass or more and 99% by mass or less, more preferably 90% by mass or more and 98% by mass or less, and even more preferably 92% by mass or more and 95% by mass or less, based on the total amount of the metalworking oil composition of this embodiment.

[0044] If the content of base oil (A) is within the above preferred range, the processability will be further improved.

[0045] <Optional ingredients> The metalworking oil composition of this embodiment may further contain any components other than the base oil (A) described above. Optional components include monohydric alcohols (C1), carboxylic acids (C2), esters obtained from monohydric alcohols and monobasic acids (C3), compounds having a hydroxyl group and / or ether linkage (D), linear olefins, extreme pressure additives, rust inhibitors, corrosion inhibitors, and defoamers.

[0046] ≪Monohydric alcohol (C1)≫ Examples of monohydric alcohols (C1) include monohydric alcohols having 1 to 25 carbon atoms, and these monohydric alcohols may be linear or branched in structure, and may be saturated or unsaturated. Specifically, monohydric alcohols (C1) include methanol, ethanol, propanol, butanol, octanol (caprylic alcohol), nonanol, decanol (capric alcohol), undecanol, dodecanol (lauryl alcohol), tridecanol, tetradecanol (myristyl alcohol), pentadecanol, hexadecanol (cetyl alcohol), heptadecanol, octadecanol (stearyl alcohol), nonadecanol, eicosanol (arachidyl alcohol), heneicosanol, docosanol (behenyl alcohol). Examples include linear saturated alcohols such as tricosanol, tetracosanol, and pentacosanol; branched saturated alcohols such as 2-ethylhexanol, isostearyl alcohol, and 2-n-octyl-1-dodecanol; and linear unsaturated alcohols such as cis-9-hexadecene-1-ol (palmitrail alcohol), 9E-octadecene-1-ol (elaidyl alcohol), cis-9-octadecene-1-ol (oleyl alcohol), and 9Z,12Z-octadecadiene-1-ol (linoleyl alcohol).

[0047] Among the above, monohydric alcohols (C1) with 6 to 20 carbon atoms are preferred, monohydric alcohols with 10 to 18 carbon atoms are more preferred, monohydric alcohols with 12 to 16 carbon atoms are even more preferred, and monohydric alcohols with 12 to 14 carbon atoms are particularly preferred. The preferred monohydric alcohol may be linear or branched, saturated or unsaturated, but linear saturated monohydric alcohols are preferred.

[0048] Monohydric alcohols (C1) may be used alone or in mixtures of two or more types.

[0049] The monohydric alcohol (C1) content is preferably 1% by mass or more, more preferably 2% by mass or more, and even more preferably 5% by mass or more, based on the total amount of the metalworking oil composition of this embodiment. The content of monohydric alcohol (C1) is preferably 15% by mass or less, more preferably 10% by mass or less, and even more preferably 8% by mass or less, based on the total amount of the metalworking oil composition of this embodiment. For example, the content of monohydric alcohol (C1) is preferably 1% by mass or more and 15% by mass or less, more preferably 2% by mass or more and 10% by mass or less, and even more preferably 5% by mass or more and 8% by mass or less, based on the total amount of the metalworking oil composition of this embodiment.

[0050] If the monohydric alcohol (C1) content is within the preferred range described above, the processability will be further improved.

[0051] ≪Carboxylic Acid (C2)≫ The carboxylic acid (C2) can be either a monobasic acid or a polybasic acid, but a monobasic acid is preferred. Examples of monobasic acids include fatty acids, specifically fatty acids having 1 to 25 carbon atoms, and these fatty acids may be linear or branched, and may be saturated or unsaturated. Among the above, fatty acids having 6 to 24 carbon atoms are preferred.

[0052] Specific examples of fatty acids include linear saturated fatty acids such as n-hexanoic acid, n-heptanoic acid, n-octanoic acid (caprylic acid), n-nonanoic acid, n-decanoic acid (capric acid), n-undecanoic acid, n-dodecanoic acid (lauric acid), n-tridecanoic acid, n-tetradecanoic acid (myristic acid), n-pentadecanoic acid, n-hexadecanoic acid (palmitic acid), n-heptadecanoic acid, n-octadecanoic acid (stearic acid), n-eicosanoic acid (arachidic acid), docosanoic acid (behenic acid), and tetracosanoic acid (lignoceric acid); isoheptanoic acid, isooctanoic acid, iso Examples include branched-chain saturated fatty acids such as nonanoic acid, isodecanoic acid, isoundecanoic acid, isododecanoic acid, isotridecanoic acid, isotetradecanoic acid, isopentadecanoic acid, isohexadecanoic acid, isoheptadecanoic acid, isooctadecanoic acid, and isoeicosanoic acid; unsaturated fatty acids such as 9-tetradecenoic acid (myristoleic acid), 9-hexadecenoic acid (palmitoleic acid), 9-octadecenoic acid (oleic acid), eicosenoic acid, and linoleic acid (9,12-octadecadienoic acid); and naturally derived fatty acids containing one or more of these fatty acids (e.g., beef tallow, coconut oil).

[0053] Carboxylic acids (C2) may be used individually or in combination of two or more. The carboxylic acid (C2) content is preferably 1% by mass or more and 15% by mass or less, more preferably 2% by mass or more and 10% by mass or less, and even more preferably 5% by mass or more and 8% by mass or less, based on the total amount of the metalworking oil composition of this embodiment.

[0054] If the carboxylic acid (C2) content is within the above preferred range, processability will be further improved.

[0055] <<Esters (C3) obtained from monohydric alcohols and monobasic acids>> Examples of esters (C3) obtained from a monohydric alcohol and a monobasic acid include the esters obtained from the monohydric alcohol (C1) and carboxylic acid (C2) mentioned above. The preferred ester is one having 13 to 22 carbon atoms, obtained from a monovalent linear saturated alcohol and a linear saturated fatty acid.

[0056] Esters (C3) obtained from a monohydric alcohol and a monobasic acid may be used individually or as a mixture of two or more. The content of the ester (C3) obtained from a monohydric alcohol and a monobasic acid is preferably 1% by mass or more and 15% by mass or less, more preferably 2% by mass or more and 10% by mass or less, and even more preferably 5% by mass or more and 8% by mass or less, based on the total amount of the metalworking oil composition of this embodiment.

[0057] If the content of the ester (C3) obtained from the monohydric alcohol and monobasic acid is within the above preferred range, the processability will be further improved.

[0058] Compounds having a hydroxyl group and / or an ether linkage (D) Compound (D) having a hydroxyl group and / or an ether bond is not particularly limited as long as it is a compound having a hydroxyl group, a compound having an ether bond, or a compound having both a hydroxyl group and an ether bond. For example, components (D1) to (D8) shown below can be cited. However, the above-mentioned monohydric alcohols (C1), carboxylic acids (C2), and esters (C3) obtained from a monohydric alcohol and a monobasic acid are excluded from the compound (D) having a hydroxyl group and / or an ether bond.

[0059] (D1) Component: Alkylene oxide adduct of polyhydric alcohol having 3 to 6 hydroxyl groups with a number average molecular weight of 100 or more and less than 1000 (D2) component: hydrocarbyl ether or hydrocarbyl ester of the above (D1) component. (D3) Component: Polyalkylene glycol with a number average molecular weight of 100 or more and less than 1000. (D4) Component: Hydrocarbyl ether or hydrocarbyl ester of the above (D3) component. (D5) Components: Dihydric alcohols with 2 to 20 carbon atoms (D6) component: hydrocarbyl ether or hydrocarbyl ester of the above (D5) component. (D7) Components: Trihydric alcohols with 3 to 20 carbon atoms (D8) component: hydrocarbyl ether or hydrocarbyl ester of the above (D7) component.

[0060] (D1) component Component (D1) is an alkylene oxide adduct of a polyhydric alcohol having 3 to 6 hydroxyl groups and a number-average molecular weight of 100 or more and less than 1000.

[0061] The polyhydric alcohol that makes up component (D1) has 3 to 6 hydroxyl groups. Specifically, the polyhydric alcohols include glycerin, polyglycerin (e.g., diglycerin, triglycerin, tetraglycerin), trimethylol alkanes (trimethylolethane, trimethylolpropane, trimethylolbutane, etc.) and their dimers to tetramers, pentaerythritol, dipentaerythritol, 1,2,4-butanetriol, 1,3,5-pentanetriol, 1,2,6-hexanetriol, and 1,2,3,4-butanetriol. Examples include polyhydric alcohols such as sorbitol, sorbitan, sorbitol glycerol condensate, adonitol, arabitol, xylitol, mannitol, idylitol, talitol, dulciitol, and allitol; and sugars such as xylose, arabinose, ribose, rhamnose, glucose, fructose, galactose, mannose, sorbose, cellobiose, maltose, isomaltose, trehalose, and sucrose.

[0062] (D1) Among the polyhydric alcohols that make up component (D1), at least one selected from the group consisting of glycerin, trimethylolalkane, and sorbitol is preferred because it is excellent in its ability to adjust the amount of aluminum adhering to the tool (work roll, etc.).

[0063] The alkylene oxide constituting component (D1) is preferably one having 2 to 6 carbon atoms, and more preferably 2 to 4 carbon atoms. Examples of alkylene oxides having 2 to 6 carbon atoms include ethylene oxide, propylene oxide, 1,2-epoxybutane (α-butylene oxide), 2,3-epoxybutane (β-butylene oxide), 1,2-epoxy-1-methylpropane, 1,2-epoxyheptane, and 1,2-epoxyhexane.

[0064] Among the alkylene oxides constituting component (D1), ethylene oxide, propylene oxide, and butylene oxide are preferred, and ethylene oxide and propylene oxide are more preferred, due to their excellent ability to adjust the amount of aluminum adhering to the tool.

[0065] When two or more alkylene oxides are used, there are no particular restrictions on the polymerization mode of the oxyalkylene groups; random copolymerization or block copolymerization is acceptable. Furthermore, when adding alkylene oxide to a polyhydric alcohol having 3 to 6 hydroxyl groups, the alkylene oxide may be added to all hydroxyl groups or to only some of them. However, an adduct with alkylene oxide added to all hydroxyl groups is preferred because it offers superior control over the amount of aluminum adhering to the tool.

[0066] Component (D1) has a number-average molecular weight of 100 or more and less than 1000, preferably 100 or more and less than 800. If the number-average molecular weight of component (D1) is 100 or more, its solubility in base oil (A) will be further improved. Furthermore, if the number-average molecular weight of component (D1) is less than 1000, the occurrence of stains during aluminum processing can be further suppressed.

[0067] Component (D1) may be obtained by adding an alkylene oxide to a polyhydric alcohol having 3 to 6 hydroxyl groups in such a reaction that the number average molecular weight is 100 or more and less than 1000. Alternatively, a mixture of alkylene oxide adducts of polyhydric alcohols having 3 to 6 hydroxyl groups obtained by any method, or a commercially available mixture of alkylene oxide adducts of polyhydric alcohols having 3 to 6 hydroxyl groups, may be used, separated by distillation or chromatography to obtain a number average molecular weight of 100 or more and less than 1000.

[0068] The (D1) component may be one of the above compounds used individually or as a mixture of two or more.

[0069] ·(D2) component Component (D2) is the hydrocarbyl ether or hydrocarbyl ester described in (D1) above.

[0070] Component (D2) can be obtained by hydrocarbyl etherification or esterification of some or all of the terminal hydroxyl groups of the alkylene oxide adduct of component (D1).

[0071] In this specification, hydrocarbyl (hydrocarbyl group) refers to a hydrocarbon group having 1 to 24 carbon atoms. As hydrocarbon groups having 1 to 24 carbon atoms, specifically, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, seD-butyl group, tert-butyl group, linear or branched pentyl group, linear or branched hexyl group, linear or branched heptyl group, linear or branched octyl group, linear or branched nonyl group, linear or branched decyl group, linear or branched undecyl group, linear or branched dodecyl group, linear or branched triglyceride group Alkyl groups with 1 to 24 carbon atoms, such as decyl groups, linear or branched tetradecyl groups, linear or branched pentadecyl groups, linear or branched hexadecyl groups, linear or branched heptadecyl groups, linear or branched octadecyl groups, linear or branched nonadecyl groups, linear or branched icosyl groups, linear or branched henicosyl groups, linear or branched docosyl groups, linear or branched tricosyl groups, linear or branched tetracosyl groups; vinyl groups, linear or Branched propenyl group, linear or branched butenyl group, linear or branched pentenyl group, linear or branched hexenyl group, linear or branched heptenyl group, linear or branched octenyl group, linear or branched nonenyl group, linear or branched decenyl group, linear or branched undecenyl group, linear or branched dodecenyl group, linear or branched tridecenyl group, linear or branched tetradecenyl group, linear or branched pentadecenyl group, linear or Alkenyl groups with 2 to 24 carbon atoms, such as branched hexadecenyl groups, linear or branched heptadecenyl groups, linear or branched octadecenyl groups, linear or branched nonadecenyl groups, linear or branched icocenyl groups, linear or branched henicocenyl groups, linear or branched dococenyl groups, linear or branched tricocenyl groups, linear or branched tetracocenyl groups; cycloalkyl groups with 5 to 7 carbon atoms, such as cyclopentyl groups, cyclohexyl groups, and cycloheptyl groups;Methylcyclopentyl group, dimethylcyclopentyl group (including all structural isomers), methylethylcyclopentyl group (including all structural isomers), diethylcyclopentyl group (including all structural isomers), methylcyclohexyl group, dimethylcyclohexyl group (including all structural isomers), methylethylcyclohexyl group (including all structural isomers), diethylcyclohexyl group (including all structural isomers), methylcycloheptyl group, dimethylcycloheptyl group (including all structural isomers) Alkylcycloalkyl groups with 6 to 11 carbon atoms, such as methylethylcycloheptyl group (including all structural isomers) and diethylcycloheptyl group (including all structural isomers); aryl groups with 6 to 10 carbon atoms, such as phenyl group and naphthyl group: tolyl group (including all structural isomers), xylyl group (including all structural isomers), ethylphenyl group (including all structural isomers), linear or branched propylphenyl group (including all structural isomers), linear or branched butylphenyl phenylphenyl groups (including all structural isomers), linear or branched pentylphenyl groups (including all structural isomers), linear or branched hexylphenyl groups (including all structural isomers), linear or branched heptylphenyl groups (including all structural isomers), linear or branched octylphenyl groups (including all structural isomers), linear or branched nonylphenyl groups (including all structural isomers), linear or branched decylphenyl groups (including all structural isomers), linear or branched Examples include alkylaryl groups with 7 to 18 carbon atoms, such as linear undecylphenyl groups (including all structural isomers) and linear or branched dodecylphenyl groups (including all structural isomers); and arylalkyl groups with 7 to 12 carbon atoms, such as benzyl groups, phenylethyl groups, phenylpropyl groups (including isomers of the propyl group), phenylbutyl groups (including isomers of the butyl group), phenylpentyl groups (including isomers of the pentyl group), and phenylhexyl groups (including isomers of the hexyl group).

[0072] The hydrocarbyl (hydrocarbyl group) constituting the hydrocarbyl ether or hydrocarbyl ester in component (D2) is a hydrocarbon group having 1 to 24 carbon atoms. Among these, linear or branched alkyl groups having 2 to 18 carbon atoms and linear or branched alkenyl groups having 2 to 18 carbon atoms are preferred due to their excellent ability to adjust the amount of aluminum adhering to the tool, while linear or branched alkyl groups having 3 to 12 carbon atoms and oleyl groups (residues obtained by removing the hydroxyl group from oleyl alcohol) are more preferred.

[0073] The acid typically used for esterification is a carboxylic acid. This carboxylic acid can be either a monobasic acid or a polybasic acid. Examples of monobasic acids include those similar to the monobasic acid of component (D1) mentioned above. Among the above, saturated fatty acids having 8 to 20 carbon atoms, unsaturated fatty acids having 8 to 20 carbon atoms, and mixtures thereof are particularly preferred as acids used for esterification.

[0074] The (D2) component may be one of the above compounds used individually or as a mixture of two or more.

[0075] (D3 component) Component (D3) is a polyalkylene glycol with a number average molecular weight of 100 or more and less than 1000. Specifically, this includes compounds obtained by homopolymerizing or copolymerizing alkylene oxides having 2 to 6 carbon atoms, preferably 2 to 4 carbon atoms. In this specification, the number-average molecular weight refers to the value obtained by comparing the retention time with that of a standard substance in a gas chromatogram and converting it. If the structure cannot be identified or a standard substance is unavailable, the polystyrene equivalent value obtained by gel permeation chromatography (GPD) using a Waters APD XT column and tetrahydrofuran as the mobile phase (standard substance: polystyrene) will be used.

[0076] Examples of alkylene oxides having 2 to 6 carbon atoms include those listed as constituents of component (D1). Among these, ethylene oxide, propylene oxide, and butylene oxide are preferred due to their excellent ability to adjust the amount of aluminum adhering to the tool, with ethylene oxide and propylene oxide being more preferred, and propylene oxide being even more preferred.

[0077] Furthermore, when two or more alkylene oxides are used in the preparation of polyalkylene glycol, there are no particular restrictions on the polymerization method of the oxyalkylene group; random copolymerization or block copolymerization is acceptable.

[0078] Furthermore, the (D3) component must have a number-average molecular weight of 100 or more and less than 1000, preferably 120 or more and less than 700. Polyalkylene glycols with a number-average molecular weight of 100 or more are preferred from the viewpoint of solubility in base oil (A). Furthermore, polyalkylene glycols with a number-average molecular weight of less than 1000 can further suppress the occurrence of stains during aluminum processing.

[0079] Furthermore, as component (D3), a polyalkylene glycol mixture obtained by any method or a commercially available polyalkylene glycol mixture separated by distillation or chromatography to obtain a number-average molecular weight of 100 or more and less than 1000 may be used.

[0080] As for component (D3), among the above, compounds obtained by homopolymerizing propylene oxide are preferred, and it is more preferable that it be one or more compounds selected from the group consisting of dipropylene glycol, tripylene glycol, and tetrapropylene glycol.

[0081] The (D3) component may be the above compounds used individually or as a mixture of two or more, but it is preferable to use a mixture of two or more from the viewpoint of further suppressing the generation of contamination due to aluminum wear particles. Specifically, the (D3) component is preferably a mixture of two or more of dipropylene glycol, tripylene glycol, and tetrapropylene glycol.

[0082] (D4 component) Component (D4) is a hydrocarbyl ether or hydrocarbyl ester of component (D3). Component (D4) is obtained by hydrocarbyl etherification or esterification of a polyalkylene glycol having a number average molecular weight of 100 or more and less than 1000, preferably 120 or more and less than 700. As component (D4), a product can be used in which some or all of the terminal hydroxyl groups of the polyalkylene glycol of component (D3) are hydrocarbyl etherified or esterified.

[0083] Specifically, the hydrocarbyl (hydrocarbyl group) can be the same group as the hydrocarbyl (hydrocarbyl group) in component (D2). Furthermore, as for the acid used in esterification, specifically, the same acid used in esterification of component (D2) can be mentioned.

[0084] The (D4) component may be one of the above compounds used individually or as a mixture of two or more.

[0085] (D5) component Component (D5) is a dihydric alcohol having 2 to 20 carbon atoms, preferably a dihydric alcohol having 3 to 18 carbon atoms. Note that the dihydric alcohol in component (D5) does not have an ether bond in its molecule.

[0086] (D5) Specifically, the components include ethylene glycol, 1,3-propanediol, propylene glycol, 1,4-butanediol, 1,2-butanediol, 2-methyl-1,3-propanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 2-ethyl-2-methyl-1,3-propanediol, 2-methyl-2,4-pentanediol, 1,7-heptanediol, 2-methyl-2-propyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol Examples include decanediol, 1,8-octanediol, 1,9-nonanediol, 2-butyl-2-ethyl-1,3-propanediol, 1,10-decanediol, 1,11-undecanediol, 1,12-dodecanediol, 1,13-tridecanediol, 1,14-tetradecanediol, 1,15-heptadecanediol, 1,16-hexadecanediol, 1,17-heptadecanediol, 1,18-octadecanediol, 1,19-nonadecanediol, and 1,20-icosadecanediol.

[0087] Among the above, component (D5) is preferably 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 2-methyl-2,4-pentanediol, 2-ethyl-2-methyl-1,3-propanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, and 1,12-dodecanediol, due to their excellent ability to adjust the amount of aluminum adhering to the tool.

[0088] The (D5) component may be one of the above compounds used individually or as a mixture of two or more.

[0089] ·(D6) component Component (D6) is a hydrocarbyl ether or hydrocarbyl ester of component (D5).

[0090] Specifically, the hydrocarbyl (hydrocarbyl group) can be the same group as the hydrocarbyl (hydrocarbyl group) in component (D2). Furthermore, as for the acid used in esterification, specifically, the same acid used in esterification of component (D2) can be mentioned.

[0091] If component (D6) is a hydrocarbyl ester of component (D5), component (D6) may be a partially esterified form of component (D5) with one of the terminal hydroxyl groups esterified (partial ester), or it may be a fully esterified form of component (D5) with both hydroxyl groups esterified. However, it is preferable that it be a partially ester because it is superior in its ability to adjust the amount of aluminum adhesion.

[0092] The (D6) component may be one of the above compounds used individually or as a mixture of two or more.

[0093] ·(D7) component Component (D7) is a trihydric alcohol with 3 to 20 carbon atoms. Component (D7) is a trihydric alcohol having 3 to 20 carbon atoms, preferably 3 to 18 carbon atoms. Note that the trihydric alcohol in component (D7) does not have an ether bond in its molecule.

[0094] The trihydric alcohols in component (D7) are specifically glycerin, 1,2,3-butanetriol, 1,2,4-butanetriol, 1,2,5-pentanetriol, 1,3,5-pentanetriol, 1,2,3-pentanetriol, 1,2,4-pentanetriol, 1,2,6-hexanetriol, 1,2,3-hexanetriol, 1,2,4-hexanetriol, 1,2,5-hexanetriol, 1,3,4-hexanetriol, 1,3,5-hexanetriol, 1,3,6-hexanetriol, and 1,4,5-hexanetriol. Examples include 1,2,7-heptanetriol, 1,2,8-octanetriol, 1,2,9-nonanetriol, 1,2,10-decanetriol, 1,2,11-undecanetriol, 1,2,12-dodecanetriol, 1,2,13-tridecanetriol, 1,2,14-tetradecanetriol, 1,2,15-pentadecantriol, 1,2,16-hexadecantriol, 1,2,17-heptadecantriol, 1,2,18-octadecanetriol, 1,2,19-nonadecantriol, and 1,2,20-icosantriol.

[0095] Among the above, component (D7) is preferably 1,2,12-dodecanetriol, 1,2,13-tridecanetriol, 1,2,14-tetradecanetriol, 1,2,15-pentadecantriol, 1,2,16-hexadecantriol, 1,2,17-heptadecantriol, or 1,2,18-octadecantriol, due to its superior ability to adjust the amount of aluminum adhering to the tool.

[0096] The (D7) component may be one of the above compounds used individually or as a mixture of two or more.

[0097] ·(D8) component Component (D8) is the hydrocarbyl ether or hydrocarbyl ester of (D7) above.

[0098] Specifically, the hydrocarbyl (hydrocarbyl group) can be the same group as the hydrocarbyl (hydrocarbyl group) in component (D2). Furthermore, as for the acid used in esterification, specifically, the same acid used in esterification of component (D2) can be mentioned.

[0099] If component (D8) is a hydrocarbyl ester of component (D7), component (D8) may be a partially esterified form in which one or two of the terminal hydroxyl groups of the trihydric alcohol of component (D7) are esterified, or it may be a fully esterified form in which all of them are esterified. However, it is preferable that it be a partially ester because it is superior in its ability to adjust the amount of aluminum adhesion.

[0100] The (D8) component may be one of the above compounds used individually or as a mixture of two or more.

[0101] Compound (D) having a hydroxyl group and / or an ether bond may be used alone or as a mixture of two or more. The content of compound (D) having a hydroxyl group and / or ether linkage is preferably 0.005% by mass or more and 5% by mass or less, more preferably 0.01% by mass or more and 2% by mass or less, even more preferably 0.03% by mass or more and 1.5% by mass or less, and particularly preferably 0.03% by mass or more and 1.2% by mass or less, based on the total amount of the metalworking oil composition of this embodiment.

[0102] If the content of compound (D) having a hydroxyl group and / or ether bond is within the above preferred range, the processability is further improved.

[0103] Linear Olefins Examples of linear olefins include linear olefins having 6 to 40 carbon atoms, among which linear olefins having 8 to 40 carbon atoms are preferred, and linear olefins having 12 to 40 carbon atoms are more preferred.

[0104] Linear olefins may have one double bond or two or more double bonds within the molecule, but those with one double bond are preferred. Furthermore, there are no particular restrictions on the position of the double bond, but it is preferable that the resulting aluminum processing lubricant composition has a double bond at the terminal, i.e., it is an n-α-olefin, because this results in superior lubricity.

[0105] Examples of linear olefins include 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-icosene, or mixtures of two or more of these.

[0106] As linear olefins, those obtained by various manufacturing methods can be used, but for example, ethylene oligomers obtained by polymerizing ethylene by conventional means can be used.

[0107] Linear olefins may be used individually or as a mixture of two or more types. The linear olefin content is preferably, for example, 1% to 30% by mass, more preferably 3% to 25% by mass, and even more preferably 5% to 20% by mass, relative to the total amount of the metalworking oil composition of this embodiment.

[0108] Extreme pressure additives Examples of extreme pressure additives include phosphorus-based compounds such as tricresyl phosphate and organometallic compounds such as zinc dialkyldithiophosphate.

[0109] Rust Inhibitor Examples of rust inhibitors include salts of fatty acids such as oleic acid, sulfonates such as dinonylnaphthalene sulfonate, partial esters of polyhydric alcohols such as sorbitan monooleate, amines and their derivatives, phosphate esters and their derivatives, and the like.

[0110] <<Corrosion Inhibitor>> Examples of corrosion inhibitors include benzotriazole.

[0111] Antifoaming agent Examples of defoaming agents include silicone-based defoaming agents.

[0112] The metalworking oil composition of this embodiment is preferably used during metalworking. Examples of metalworking methods include cold, warm, or hot rolling, pressing, punching, ironing, drawing, forging, cutting including minute quantity cutting (MQL), and grinding. Examples of metals include aluminum, magnesium and their alloys, as well as transition metals and their alloys such as copper, iron, chromium, nickel, zinc, tin, and titanium, electrical steel, or stainless steel. The metalworking oil composition of this embodiment has good workability and is therefore particularly suitable for rolling aluminum and aluminum alloys. [Examples]

[0113] The effects of the present invention will be described in detail below using examples and comparative examples, but the present invention is not limited to the following examples.

[0114] <Preparation of base oil (A)> Base oils with the physical properties shown in Table 1 (A1-1, A2-1, A2-2, and a-1) were prepared. Note that base oils A2-1 and A2-2 are a mixture.

[0115] [Measurement of the proton ratio of methyl groups] Each base oil 1 The proton ratios of the methyl group (CH3), methylene group (CH2), and methine group (CH) were measured using 1H-NMR analysis, with the integrated value of all protons detected set to 100. The results are shown in Table 1.

[0116] 1 The measurement equipment and conditions used for H-NMR measurement are as follows: Equipment used: Bruker AVANCE III HD-cryo600 NMR spectrometer. 1 H resonance frequency: 600.18MHz Solvent: CDCl3 Concentration: Approximately 50mg / mL Measurement method: 1 H Non-Decoupling Method Pulse width: 30° pulse Waiting time: 5 seconds Chemical shift standard: CHCl3 in CDCl3 (7.28 ppm)

[0117] [Measurement of distillation properties] The initial and final boiling points of each base oil were measured in accordance with the atmospheric pressure method of JIS K 2254. The initial boiling point (IBP), final boiling point (FBP), and the difference between the final and initial boiling points (FBP-IBP) for each base oil are shown in Table 1.

[0118] [Measurement of kinematic viscosity] The kinematic viscosity of each base oil at 40°C was measured in accordance with JIS K 2283-2000 "Crude oil and petroleum products - Methods for testing kinematic viscosity and calculating viscosity index". The results are shown in Table 1.

[0119] [Measuring the flash point] (COC: Cleveland Open Type): The flash point of each base oil was measured in accordance with JIS K2265-4:2007. The results are shown in Table 1.

[0120] [Measurement of carbon number distribution] The carbon number distribution of each base oil was measured by gas chromatography-distillation. The results are shown in Table 1. The measurement conditions for gas chromatography distillation are as follows: Model: Shimadzu Corporation GC-2030 Column: UA-1 MS / HT (30m×0.25mmI.D.×0.10μm) Carrier gas: Helium 200kPa Detector:FID Det.Temp.: 350℃ Oven Temp: 50°C (2 min) ~ 170°C Temp.Rate: 6℃ / min

[0121] [Table 1]

[0122] <Preparation of metalworking fluid composition> (Examples 1-10, Comparative Examples 1-5) Using the components shown in Tables 2 and 3, metalworking oil compositions for each example were prepared. In Tables 1 and 2, the abbreviations have the following meanings. The values ​​in the tables represent the content (mass%) relative to 100% of the total weight of the metalworking oil composition. In addition, for base oil (A), the percentage of each component contained in base oil (A) is also shown.

[0123] A1-1, A2-1, A2-2, a-1: Base oil as described above C1-1: Lauryl alcohol

[0124] [Evaluation of processability] Using each example of the metalworking oil composition, aluminum cold rolling was performed using a small rolling mill. Using a work roll with a diameter of Φ51 mm and a Ra of 0.1 μm, aluminum material (JIS A1050 material, 0.35 mm thick, 100 mm wide) was rolled at a rolling speed of 100 m / min. Starting with a reduction ratio of 40%, the reduction ratio was increased by 2% every 60 seconds to measure the highest reduction ratio at which rolling could be performed without surface damage. The results are shown in Tables 2 and 3 as the "Rolling Limit Reduction Ratio (%)". A higher rolling limit value indicates better processability. <Measurement Conditions> Metalworking oil composition supply amount: 6L / min Temperature of metalworking fluid composition: 40℃

[0125] [Table 2]

[0126] [Table 3]

[0127] As shown in Tables 2 and 3, the metalworking oil compositions of the examples were found to have a higher rolling limit reduction ratio and better workability compared to the metalworking oil compositions of the comparative examples.

Claims

1. It contains base oil (A), The base oil (A) is １ The product includes branched-chain hydrocarbons (A1) in which the proton ratio of methyl groups is between 20 and 50, with the integrated value of all protons detected by H-NMR analysis set to 100, and mineral oils (A2) in which the proton ratio of methyl groups is less than 20 and greater than 50. A metalworking oil composition wherein the content of the branched-chain hydrocarbon (A1) is 3% by mass or more relative to the total amount of the base oil (A).

2. The metalworking oil composition according to claim 1, wherein the branched-chain hydrocarbon (A1) has a volume ratio (CB / CA) of 0.4 or more between the proportion of hydrocarbon with the most abundant number of carbon atoms (CA) and the proportion of hydrocarbon with the second most abundant number of carbon atoms (CB) in the carbon number distribution obtained by gas chromatographic distillation.

3. The metalworking oil composition according to claim 1 or 2, wherein the molecular weight of the branched hydrocarbon (A1) is 86 or more and 310 or less.

4. A metalworking oil composition according to claim 1 or 2, used in metal rolling.

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