Metal processing oil composition

Abstract

To provide a metal processing oil composition for preservation of natural environment as well as having improved processability and reduced generation amounts of abrasion powders.SOLUTION: In a metal processing oil composition including a base oil (A) and an oily agent (C), the base oil (A) includes a hydrocarbon base oil (A1) having biomass-derived carbon and a hydrocarbon base oil (A2) free from biomass-derived carbon, the oily agent (C) includes one or more kinds of oily agents selected from a group consisting of esters and alcohols, a content of the hydrocarbon base oil (A1) having biomass-derived carbon is 1 mass% or over and 60 mass% or under to the total amount of the base oil (A), and a content of the hydrocarbon base oil (A2) free from biomass-derived carbon is 40 mass % or over and 99 mass % or under to the total amount of the base oil (A).SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a metalworking oil composition. [Background technology]

[0002] In metal processing, metal processing oil compositions are used for lubrication and cooling. By using an appropriate metal processing oil composition, good processability can be obtained, and efficient production can be achieved. In addition, the surface condition of the processed product can be improved.

[0003] For example, in the processing of aluminum, in addition to the good processability of aluminum, it is also important that the surface of the processed aluminum is clean and not contaminated by stains or wear particles. Therefore, there is a demand for a metal processing oil composition that can prevent the aluminum surface from being contaminated after processing. This demand is particularly important in the processing of aluminum, which is often used for containers for food and medicine. Here, the processing of aluminum includes rolling, punching, drawing, ironing, cutting, grinding, etc. of aluminum.

[0004] In recent years, from the viewpoint of preserving the natural environment, there has been an increasing demand for the creation of a recycling-based society, and there is a desire to move away from fossil fuel resources and become so-called carbon neutral. For this reason, the use of raw materials derived from biomass has been attracting attention. Biomass is a renewable, organic resource derived from living organisms, excluding fossil resources. Since biomass-derived raw materials do not affect the concentration of carbon dioxide in the atmosphere, carbon neutrality can be achieved by using biomass-derived raw materials. From the viewpoint of protecting the natural environment, the above-mentioned metal working oil compositions are also required to utilize raw materials derived from biomass.

[0005] As an example of a composition containing a biomass-derived base oil, Patent Document 1 discloses a hydraulic oil containing a biomass-derived base oil and an antioxidant. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2015 / 192072 Summary of the Invention [Problem to be solved by the invention]

[0007] Although studies have been conducted to reduce the environmental impact of conventional compositions such as those described in Patent Document 1, there is still room for improvement in terms of improving processability and suppressing the amount of wear powder generated.

[0008] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a metal working oil composition which conserves the natural environment, has improved workability, and reduces the amount of wear powder generated. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention employs the following configuration. [1] A metal working oil composition containing a base oil (A) and an oiliness agent (C), wherein the base oil (A) contains a hydrocarbon base oil (A1) having biomass-derived carbon and a hydrocarbon base oil (A2) having no biomass-derived carbon, and the oiliness agent (C) contains one or more oiliness agents selected from esters and alcohols, the content of the hydrocarbon base oil (A1) having biomass-derived carbon being 1% by mass or more and 60% by mass or less, based on the total amount of the base oil (A), and the content of the hydrocarbon base oil (A2) not having biomass-derived carbon being 40% by mass or more and 99% by mass or less, based on the total amount of the base oil (A). [2] The biomass-derived carbon-free hydrocarbon base oil (A2) has an aniline point of 100° C. or less and N The metal working oil composition according to [1], comprising a hydrocarbon base oil having a content of 40% or more. [3] The metal working oil composition according to [1] or [2], wherein the hydrocarbon base oil (A2) having no biomass-derived carbon is a mineral oil. [4] The 40°C kinematic viscosity of the biomass-derived carbon-free hydrocarbon base oil (A2) is 6.00 mm 2 The metal working oil composition according to any one of [1] to [3], wherein the metal working oil composition has a viscosity of less than 1000:1. [5] The metal working oil composition according to any one of [1] to [4], wherein the 95% distillation temperature of the biomass-derived carbon-free hydrocarbon base oil (A2) is 380°C or lower. [6] The metal working oil composition according to any one of [1] to [5], wherein the oiliness agent (C) contains an alcohol. [7] The metal working oil composition according to any one of [1] to [5], wherein the oily agent (C) contains a monohydric alcohol or an ester, and a polyalkylene glycol, and the ester is an ester having 7 to 26 carbon atoms obtained from a monohydric alcohol and a monobasic acid. [8] The metal working oil composition according to any one of [1] to [7], wherein the content of the biomass-derived carbon-free hydrocarbon base oil (A2) is 60 mass% or more and 99 mass% or less, based on the total amount of the base oil (A). Effect of the Invention

[0010] According to the present invention, it is possible to provide a metalworking oil composition which conserves the natural environment, has improved workability, and generates a reduced amount of wear powder. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (Metalworking oil composition) The metal working oil composition of the present embodiment contains a base oil (A) and an oiliness agent (C). The metal working oil composition of this embodiment has a kinetic viscosity of 1.00 mm at 40 ° C. 2 / s or more is preferable, and 1.20 mm 2 / s or more is more preferable, and 1.50 mm 2 It is even more preferable that the ratio is 1 / s or more. On the other hand, the kinetic viscosity of the metal processing oil composition of this embodiment at 40 ° C. is 7.00 mm 2 / s or less is preferable, and 6.00 mm 2 More preferably, it is less than 5.00 mm / s. 2 More preferably, it is 3.50 mm / s or less. 2 It is particularly preferable that the ratio is equal to or less than 1 / s. For example, the kinetic viscosity of the metal working oil composition of this embodiment at 40°C is 1.00 mm 2 / s or more 7.00mm 2 / s or less is preferable, and 1.20 mm 2 / s or more 6.00mm 2 More preferably, it is less than 1.50 mm / s. 2 / s or more 5.00mm 2 More preferably, it is 1.50 mm / s or less. 2 / s or more 3.50mm 2 It is particularly preferable that the ratio is equal to or less than 1 / s.

[0012] When the metal working oil composition of this embodiment has a kinetic viscosity at 40°C of at least the above-mentioned preferable lower limit, the workability is further improved. When the metal working oil composition of this embodiment has a kinematic viscosity at 40° C. that is equal to or less than the above-mentioned preferable upper limit, the amount of wear powder generated is further reduced.

[0013] In this specification, unless otherwise specified, the kinetic viscosity at 40°C means the kinetic viscosity at 40°C measured in accordance with JIS K2283:2000.

[0014] <Base oil (A)> The kinetic viscosity of base oil (A) at 40°C is 1.00mm 2 / s or more is preferable, and 1.20 mm 2 / s or more is more preferable, and 1.50 mm 2 It is even more preferable that the ratio is 1 / s or more. On the other hand, the kinetic viscosity of base oil (A) at 40°C is 7.00mm 2 / s or less is preferable, and 6.00 mm 2More preferably, it is less than 5.00 mm / s. 2 More preferably, it is 3.50 mm / s or less. 2 It is particularly preferable that the ratio is equal to or less than 1 / s. For example, the kinetic viscosity of base oil (A) at 40°C is 1.00 mm 2 / s or more 7.00mm 2 / s or less is preferable, and 1.20 mm 2 / s or more 6.00mm 2 More preferably, it is less than 1.50 mm / s. 2 / s or more 5.00mm 2 More preferably, it is 1.50 mm / s or less. 2 / s or more 3.50mm 2 It is particularly preferable that the ratio is equal to or less than 1 / s.

[0015] When the kinematic viscosity at 40° C. of the base oil (A) in the metal working oil composition of this embodiment is equal to or higher than the above preferred lower limit, the workability is further improved. When the base oil (A) of the metal working oil composition of this embodiment has a kinetic viscosity at 40° C. of not more than the above-mentioned preferable upper limit, the amount of wear powder generated is further reduced, and the removability is improved.

[0016] The 95% distillation temperature of the base oil (A) is preferably 380° C. or lower, more preferably 350° C. or lower, and even more preferably 260° C. or lower.

[0017] When the 95% distillation temperature of the base oil (A) is equal to or lower than the above-mentioned preferable upper limit, the removability of the metal working oil composition of the present embodiment containing the base oil (A) is further improved.

[0018] The lower limit of the 95% distillation temperature of the base oil (A) is not particularly limited, but it is preferably, for example, 200° C. or higher.

[0019] In this specification, the 95% distillation temperature refers to the value obtained by distillation using a gas chromatographic method measured in accordance with JIS K2254 "Petroleum products - Distillation test method." When the metal working oil composition of the present embodiment contains two or more types of base oils (A), the "95% distillation temperature" of the base oil (A) means the value measured by gas chromatographic distillation for a mixture of two or more types of base oils (A).

[0020] The base oil (A) includes a hydrocarbon base oil (A1) having biomass-derived carbon and a hydrocarbon base oil (A2) not having biomass-derived carbon.

[0021] <Hydrocarbon base oil containing biomass-derived carbon (A1)> Specific examples of the hydrocarbon base oil (A1) having biomass-derived carbon (hereinafter also referred to as "component (A1)") include hydrocarbon base oils synthesized from vegetable oils such as palm oil, coconut oil, soybean oil, rapeseed oil, corn oil, and mixtures thereof.

[0022] Commercially available examples of the component (A1) include SynNova 4 Base Oil (manufactured by Novvi), SynNova 9 Base Oil (manufactured by Novvi), and NovaSolv 160 (manufactured by Novvi).

[0023] The (A1) component has a biomass-derived carbon content, as measured by ASTM D6866, of preferably 20 mass% or more, more preferably 60 mass% or more, even more preferably 80 mass% or more, and particularly preferably 100 mass%.

[0024] ASTM D6866 (Biobased Content Testing Standard) is a standard established to determine the biobased content of solids, liquids, and gases using radioactive carbon (C14) analysis. Since biomass contains a certain amount of radioactive carbon (C14), raw materials derived from biomass also contain radioactive carbon (C14). On the other hand, raw materials derived from fossil resources do not contain radioactive carbon (C14).

[0025] The kinetic viscosity of component (A1) at 40°C is 1.00mm 2 / s or more is preferable, and 1.20 mm2 / s or more is more preferable, and 1.50 mm 2 It is even more preferable that the ratio is 1 / s or more. On the other hand, the kinetic viscosity of component (A1) at 40°C is 7.00mm 2 / s or less is preferable, and 6.50 mm 2 / s or less is more preferable, and 6.00 mm 2 More preferably, it is 4.00 mm / s or less. 2 / s or less is particularly preferred. For example, the kinetic viscosity of component (A1) at 40°C is 1.00 mm 2 / s or more 7.00mm 2 / s or less is preferable, and 1.20 mm 2 / s or more 6.50mm 2 / s or less is more preferable, and 1.50 mm 2 / s or more 6.00mm 2 More preferably, it is 1.50 mm / s or less. 2 / s or more 4.00mm 2 It is particularly preferable that the ratio is equal to or less than 1 / s.

[0026] When the kinetic viscosity of the component (A1) at 40° C. is at least the above preferred lower limit, processability is further improved. When the kinetic viscosity of the component (A1) at 40° C. is equal to or less than the above-mentioned preferable upper limit, the amount of wear powder generated is further reduced, and the removability is improved.

[0027] In the metal working oil composition of this embodiment, the component (A1) may be used alone, or a plurality of components (A1) may be mixed and used. The content of the (A1) component is from 1 to 60% by mass, preferably from 1 to 30% by mass, and more preferably from 1 to 10% by mass, based on the total amount of the base oil (A).

[0028] By making the content of the (A1) component 1 mass % or more and 60 mass % or less, it is possible to improve processability while reducing the amount of wear powder generated. If the content of the (A1) component is within the above-mentioned preferable range, it is possible to further reduce the amount of wear powder generated.

[0029] <<Biomass-derived carbon-free hydrocarbon base oil (A2)>> Specific examples of the biomass-derived carbon-free hydrocarbon base oil (A2) (hereinafter also referred to as "component (A2)") include aliphatic saturated hydrocarbon oils, aliphatic unsaturated hydrocarbon oils (olefin-based hydrocarbons), alicyclic hydrocarbon oils (naphthenic hydrocarbons), and aromatic hydrocarbon oils. The aliphatic saturated hydrocarbon oil may be a straight-chain saturated hydrocarbon oil (normal paraffin-based hydrocarbon) or a branched-chain saturated hydrocarbon oil (isoparaffin-based hydrocarbon).

[0030] As the (A2) component, among the above, the aniline point is 100°C or less and the %C N It is preferable that the composition contains a hydrocarbon base oil (A2a) (hereinafter also referred to as "component (A2a)") having a content of 40% or more.

[0031] The aniline point refers to a value determined in accordance with ASTM D611-12 Standard Test Methods for Aniline Point and Mixed Aniline Point of Petroleum Products and Hydrocarbon Solvents.

[0032] %C N means a value determined by a method in accordance with ASTM D 3238-85 (ndM ring analysis). %C N means the percentage (mass proportion) of naphthenic carbon number to the total carbon number.

[0033] The content of the component (A2a) relative to the total amount of the component (A2) is preferably 80 mass % or more, more preferably 90 mass % or more, and even more preferably 95 mass % or more, and may be 100 mass % or more.

[0034] Specific examples of the component (A2) include mineral oils and synthetic oils, with mineral oils being preferred.

[0035] Mineral oil As the mineral oil, a distillate oil obtained by atmospheric distillation of crude oil can be used. In addition, a lubricating oil fraction obtained by further distilling the distillate oil under reduced pressure and refining the distillate oil by various refining processes can also be used. The refining process may be a suitable combination of hydrorefining, solvent extraction, solvent dewaxing, hydrodewaxing, sulfuric acid washing, clay treatment, etc. Mineral oil can be obtained by combining these refining processes in a suitable order. In addition, a mixture of a plurality of refined oils having different properties obtained by subjecting different crude oils or distillate oils to a combination of different refining processes may be used. Among the above, mineral oil is %C A Mineral oils having a .DELTA..times.1.0 or less are preferred. %C A means a value determined by a method (ndM ring analysis) in accordance with ASTM D 3238-85. A means the percentage of the number of aromatic carbon atoms to the total number of carbon atoms.

[0036] Component (A2) may consist of one mineral oil, or may be a mixed base oil containing two or more mineral oils. When two or more mineral oils are contained, they may be naphthenic or paraffinic, or may contain a synthetic type, as described below.

[0037] ·Synthetic oil Examples of synthetic oils include polyolefins and alkylbenzenes.

[0038] Polyolefin Examples of polyolefins include homopolymers or copolymers of olefin monomers having 2 to 16 carbon atoms, preferably 2 to 12 carbon atoms, and hydrogenated polymers thereof. The olefin monomers may be any of α-olefins, internal olefins, linear olefins, and branched olefins. Specific examples of such olefin monomers include ethylene, propylene, 1-butene, 2-butene, isobutene, pentene, hexene, heptene, octene, nonene, decene, undecene, dodecene, tridecene, tetradecene, pentadecene, hexadecene, and mixtures thereof.

[0039] The polyolefin can be produced by a known method. For example, it can be produced by a thermal reaction without a catalyst, or the target polyolefin can be produced by homopolymerizing or copolymerizing the olefin using a known catalyst such as an organic peroxide catalyst such as benzoyl peroxide; a Friedel-Crafts catalyst such as aluminum chloride, aluminum chloride-polyhydric alcohol system, aluminum chloride-titanium tetrachloride system, aluminum chloride-alkyltin halide system, or boron fluoride; a Ziegler type catalyst such as organic aluminum chloride-titanium tetrachloride system or organic aluminum-titanium tetrachloride system; a metallocene type catalyst such as aluminoxane-zirconocene system or ionic compound-zirconocene system; or a Lewis acid complex type catalyst such as aluminum chloride-base system or boron fluoride-base system.

[0040] Alkylbenzene The alkylbenzene preferably has in the molecule 1 to 4 alkyl groups each having a carbon number of 1 to 40. The alkyl group of the alkylbenzene may be linear or branched.

[0041] The alkylbenzene can be produced by a known method, for example, by using an aromatic compound as a raw material, an alkylating agent and an alkylation catalyst. Specific examples of the aromatic compound used as the raw material include benzene, toluene, xylene, ethylbenzene, methylethylbenzene, diethylbenzene, and mixtures thereof. Specific examples of the alkylating agent include linear or branched olefins having 6 to 40 carbon atoms obtained by polymerization of lower monoolefins such as ethylene, propylene, butene, and isobutylene, preferably propylene; linear or branched olefins having 6 to 40 carbon atoms obtained by thermal decomposition of wax, heavy oil, petroleum fractions, polyethylene, polypropylene, and the like; linear olefins having 9 to 40 carbon atoms obtained by separating n-paraffins from petroleum fractions such as kerosene and diesel and olefinating them with a catalyst, and mixtures of these. Examples of the alkylation catalyst used in the alkylation include known catalysts such as Friedel-Crafts type catalysts, such as aluminum chloride and zinc chloride; and acidic catalysts, such as sulfuric acid, phosphoric acid, tungstosilicic acid, hydrofluoric acid and activated clay.

[0042] The kinetic viscosity of component (A2) at 40°C is 1.00mm 2 / s or more is preferable, and 1.20 mm 2 / s or more is more preferable, and 1.50 mm 2 It is even more preferable that the ratio is 1 / s or more. On the other hand, the kinetic viscosity of component (A2) at 40°C is 7.00mm 2 / s or less is preferable, and 6.50 mm 2 / s or less is more preferable, and 6.00 mm 2 More preferably, it is less than 4.00 mm / s. 2 / s or less is particularly preferred. For example, the kinetic viscosity of component (A2) at 40°C is 1.00 mm 2 / s or more 7.00mm 2 / s or less is preferable, and 1.20 mm 2 / s or more 6.50mm 2 / s or less is more preferable, and 1.50 mm 2 / s or more 6.00mm 2More preferably, it is less than 1.50 mm / s. 2 / s or more 4.00mm 2 It is particularly preferable that the ratio is equal to or less than 1 / s.

[0043] When the kinetic viscosity of the component (A2) at 40° C. is at least the above-mentioned preferable lower limit, processability is further improved. When the kinetic viscosity of component (A2) at 40° C. is equal to or less than the above-mentioned preferable upper limit, the amount of wear powder generated is further reduced, and the removability is improved.

[0044] The 95% distillation temperature of the component (A2) is preferably 380°C or lower, more preferably 350°C or lower, and even more preferably 260°C or lower.

[0045] When the 95% distillation temperature of component (A2) is equal to or lower than the above-mentioned preferable upper limit, the removability of the metal working oil composition of this embodiment containing component (A2) is further improved.

[0046] There is no particular lower limit for the 95% distillation temperature of component (A2), but it is preferably, for example, 200° C. or higher.

[0047] In the metal working oil composition of this embodiment, the component (A2) may be used alone or in combination of two or more types of components (A2). The content of the (A2) component is from 40 to 99 mass%, preferably from 70 to 99 mass%, and more preferably from 90 to 99 mass%, based on the total amount of the base oil (A).

[0048] By setting the content of the (A2) component to 40% by mass or more and 99% by mass or less, the amount of wear powder generated can be reduced while improving processability. If the content of the (A2) component is within the above-mentioned preferred range, the amount of wear powder generated can be further reduced.

[0049] <Oil-based agent (C)> The oily agent (C) includes one or more oily agents selected from esters and alcohols. The oily agent (C) preferably contains an alcohol.

[0050] Alcohol The alcohol is preferably a monohydric alcohol (C1) (hereinafter also referred to as "component (C1)").

[0051] Specific examples of the component (C1) include monohydric alcohols having 1 to 25 carbon atoms. The monohydric alcohols may be linear or branched, and may be saturated or unsaturated. Specific examples of the component (C1) include methanol, ethanol, propanol, butanol, octanol (capryl 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, and docosanol (behenyl alcohol). linear saturated alcohols such as 2-ethylhexanol, isostearyl alcohol, 2-n-octyl-1-dodecanol, etc.; branched saturated alcohols such as cis-9-hexadecen-1-ol (palmitoleyl alcohol), 9E-octadecen-1-ol (elaidyl alcohol), cis-9-octadecen-1-ol (oleyl alcohol), 9Z,12Z-octadecadien-1-ol (linoleyl alcohol), etc.

[0052] As the component (C1), among the above, a linear saturated alcohol having 1 to 25 carbon atoms is preferable, a linear saturated alcohol having 10 to 20 carbon atoms is more preferable, a linear saturated alcohol having 10 to 16 carbon atoms is even more preferable, and lauryl alcohol and myristyl alcohol are particularly preferable.

[0053] In the metal working oil composition of this embodiment, the component (C1) may be used alone, or a plurality of components (C1) may be mixed and used. The amount of the component (C1) per 100 parts by mass of the component (A) is preferably at least 1 part by mass, more preferably at least 2 parts by mass, and even more preferably at least 3 parts by mass. The amount of the component (C1) is preferably no more than 10 parts by mass, more preferably no more than 9 parts by mass, and even more preferably no more than 7 parts by mass, per 100 parts by mass of the component (A). For example, the content of the (C1) component is preferably 1 to 10 parts by mass, more preferably 2 to 9 parts by mass, and even more preferably 3 to 7 parts by mass, per 100 parts by mass of the (A) component.

[0054] If the content of the component (C1) is within the above preferred range, the processability is further improved.

[0055] Ester Examples of the ester include esters obtained from monohydric alcohols and monobasic acids, and esters (C2) (hereinafter also referred to as "component (C2)") having 7 to 26 carbon atoms obtained from monohydric alcohols and monobasic acids are preferred.

[0056] Monohydric alcohol Examples of the monohydric alcohol used as a raw material for the component (C2) include the same monohydric alcohols as those for the component (C1) above. Among these, the monohydric alcohol used as the raw material for component (C2) is preferably a linear saturated alcohol having 1 to 25 carbon atoms, more preferably a linear saturated alcohol having 1 to 10 carbon atoms, even more preferably a linear saturated alcohol having 2 to 6 carbon atoms, and particularly preferably butanol.

[0057] Monobasic acid Examples of monobasic acids used as a raw material for the component (C2) include fatty acids, specifically fatty acids having 1 to 25 carbon atoms. The fatty acids may be linear or branched, and may be saturated or unsaturated. Of the above fatty acids, fatty acids having 6 to 24 carbon atoms are preferred.

[0058] Preferred specific examples 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-icosanoic acid (arachidic acid), docosanoic acid (behenic acid), and tetracosanoic acid (lignoceric acid); isoheptanoic acid, isooctanoic acid, and iso-octanoic acid. Examples of branched-chain saturated fatty acids include nonanoic acid, isodecanoic acid, isoundecanoic acid, isododecanoic acid, isotridecanoic acid, isotetradecanoic acid, isopentadecanoic acid, isohexadecanoic acid, isoheptadecanoic acid, isooctadecanoic acid, and isoicosanoic acid; unsaturated fatty acids include 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 occurring fatty acids containing one or more of these fatty acids (e.g., beef tallow, coconut oil). Among these, the monobasic acid used as the raw material for component (C2) is preferably a linear saturated fatty acid having 6 to 24 carbon atoms, more preferably a linear saturated fatty acid having 10 to 22 carbon atoms, even more preferably a linear saturated fatty acid having 12 to 20 carbon atoms, with lauric acid, myristic acid, palmitic acid, and stearic acid being particularly preferred.

[0059] Of the above, the component (C2) is preferably an ester having 13 to 22 carbon atoms obtained from a monohydric alcohol and a monobasic acid, and specifically, methyl laurate, ethyl laurate, propyl laurate, butyl laurate, pentyl laurate, hexyl laurate, heptyl laurate, octyl laurate, nonyl laurate, decyl laurate, methyl palmitate, ethyl palmitate, propyl palmitate, butyl palmitate, pentyl palmitate, and hexyl palmitate are more preferred, with methyl laurate, butyl palmitate, and butyl stearate being particularly preferred.

[0060] In the metal working oil composition of this embodiment, the component (C2) may be used alone or in combination of a plurality of components (C2). The amount of the component (C2) per 100 parts by mass of the component (A) is preferably at least 1 part by mass, more preferably at least 2 parts by mass, and even more preferably at least 3 parts by mass. The amount of the component (C2) is preferably no more than 10 parts by mass, more preferably no more than 9 parts by mass, and even more preferably no more than 7 parts by mass, per 100 parts by mass of the component (A). For example, the content of the (C2) component is preferably 1 to 10 parts by mass, more preferably 2 to 9 parts by mass, and even more preferably 3 to 7 parts by mass, per 100 parts by mass of the (A) component.

[0061] If the content of the component (C2) is within the above preferred range, the processability is further improved.

[0062] When the metal working oil composition of the present embodiment contains the components (C1) and (C2), the total content of the components (C1) and (C2) is preferably 1 part by mass or more, more preferably 2 parts by mass or more, and even more preferably 3 parts by mass or more, per 100 parts by mass of the component (A). The combined amount of the components (C1) and (C2) is preferably no more than 10 parts by mass, more preferably no more than 9 parts by mass, and even more preferably no more than 7 parts by mass, per 100 parts by mass of the component (A). For example, the total amount of the (C1) and (C2) components is preferably 1 part by mass or more and 10 parts by mass or less, more preferably 2 parts by mass or more and 9 parts by mass or less, and even more preferably 3 parts by mass or more and 7 parts by mass or less, per 100 parts by mass of the (A) component.

[0063] When the total content of the components (C1) and (C2) is within the above preferred range, processability is further improved.

[0064] The oily agent (C) may contain oily agents other than esters and alcohols. Other oily agents include polyalkylene glycol (C3) (hereinafter also referred to as "(C3) component"), monobasic acid (C4) (hereinafter also referred to as "(C4) component"), and the like.

[0065] Polyalkylene glycol Specific examples of the component (C3) include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, and tripropylene glycol, with tripropylene glycol being preferred among these.

[0066] When the metal working oil composition of this embodiment contains the component (C3), the content of the component (C3) is preferably 0.01 part by mass or more, more preferably 0.05 part by mass or more, and even more preferably 0.1 part by mass or more, per 100 parts by mass of the component (A). The content of the component (C3) is preferably no more than 1 part by mass, more preferably no more than 0.8 parts by mass, and even more preferably no more than 0.5 parts by mass. For example, the content of the (C3) component is preferably from 0.01 to 1 part by mass, more preferably from 0.05 to 0.8 parts by mass, and even more preferably from 0.1 to 0.5 parts by mass.

[0067] If the content of the component (C3) is within the above preferred range, the processability is further improved.

[0068] Monobasic acid Examples of the component (C4) include monobasic acids similar to those used as raw materials for the component (C2).

[0069] When the metal working oil composition of this embodiment contains the (C4) component, the content of the (C4) component is preferably 1 part by mass or less, more preferably 0.8 parts by mass or less, and even more preferably 0.5 parts by mass or less, per 100 parts by mass of the (A) component. From the viewpoint of reducing the amount of wear powder generated, the metal working oil composition of this embodiment does not contain the component (C4), or, if it contains the component (C4), the content of the component (C4) is preferably 1 part by mass or less per 100 parts by mass of the component (A).

[0070] The component (C) in the metal working oil composition of the present embodiment may use one type alone, or two or more types in combination.

[0071] The content of the component (C) in the metal working oil composition of this embodiment is preferably 1 part by mass or more, more preferably 2 parts by mass or more, and even more preferably 3 parts by mass or more, per 100 parts by mass of the component (A). The amount of the component (C) is preferably no more than 10 parts by mass, more preferably no more than 9 parts by mass, and even more preferably no more than 7 parts by mass, per 100 parts by mass of the component (A). For example, the content of the (C) component is preferably 1 part by mass or more and 10 parts by mass or less, more preferably 2 parts by mass or more and 9 parts by mass or less, and even more preferably 3 parts by mass or more and 7 parts by mass or less, per 100 parts by mass of the (A) component.

[0072] If the content of component (C) is within the above preferred range, processability is further improved.

[0073] The component (C) contains one or more oiliness agents selected from esters and alcohols, and from the viewpoints of further improving processability and further reducing the amount of wear powder generated, it preferably contains the component (C1) or the component (C2) and the component (C3).

[0074] <Optional ingredients> The metal working oil composition of this embodiment may contain optional components other than the above-mentioned base oil (A) component and (C) component, such as antioxidants, rust inhibitors, corrosion inhibitors, antifoaming agents, metal detergents, antiwear agents, viscosity index improvers, pour point depressants, mist inhibitors, and demulsifiers.

[0075] Examples of the antioxidant include phenolic compounds such as 2,6-di-t-butylphenol and 2,6-di-t-butyl-p-cresol; and amine compounds such as diphenylamine, dialkyldiphenylamine, phenyl-α-naphthylamine, and p-alkylphenyl-α-naphthylamine. When the metalworking oil composition contains an antioxidant, the content is, for example, 0.5 to 10 mass% based on the total amount of the metalworking oil composition. The antioxidant may be used alone or in combination of two or more antioxidants.

[0076] As the corrosion inhibitor, for example, a known corrosion inhibitor such as a benzotriazole-based compound, a tolyltriazole-based compound, a thiadiazole-based compound, and an imidazole-based compound can be used. When the metalworking oil composition contains a corrosion inhibitor, the content thereof is, for example, 0.01 to 10 mass% based on the total amount of the metalworking oil composition. The corrosion inhibitor may be used alone or in combination of two or more corrosion inhibitors.

[0077] Specific examples of the rust inhibitor include salts of fatty acids such as oleic acid, sulfonates such as dinonylnaphthalene sulfonate, partial esters of polyhydric alcohols such as sorbitan monooleate (excluding those that fall under oily agents (C)), amines and their derivatives, and the like.

[0078] The antifoaming agent may be a silicone-based antifoaming agent.

[0079] Examples of anti-wear agents include dithiocarbamates, zinc dithiocarbamates, molybdenum dithiocarbamates, disulfides, polysulfides, sulfurized olefins, and sulfurized oils and fats.

[0080] Examples of viscosity index improvers include non-dispersant or dispersant poly(meth)acrylate-based viscosity index improvers, non-dispersant or dispersant olefin-(meth)acrylate copolymer-based viscosity index improvers, styrene-maleic anhydride ester copolymer-based viscosity index improvers, and mixtures thereof.

[0081] The pour point depressant may, for example, be a polymethacrylate-based polymer that is compatible with the base oil (A).

[0082] Examples of the mist suppressant include ethylene-propylene copolymer, polymethacrylate, polyisobutylene, polybutene, etc. The average molecular weight of these compounds as the mist suppressant is usually 10,000 to 8,000,000.

[0083] Examples of the demulsifier include polyalkylene glycol-based nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, and polyoxyethylene alkyl naphthyl ether.

[0084] The metal working oil composition of the present embodiment described above contains a hydrocarbon base oil (A1) having biomass-derived carbon, a hydrocarbon base oil (A2) not having biomass-derived carbon, and one or more oily agents (C) selected from esters and alcohols. By combining the (A2) component with the (A1) component and by keeping the contents of the (A2) and (A1) components within a specific range, it is possible to reduce the environmental impact, improve processability, and reduce the amount of wear powder generated. In addition, by combining the (A1) component and the (A2) component with one or more oiliness agents selected from esters and alcohols that are optimal for the (A1) component and the (A2) component, it is possible to further improve processability. Therefore, according to the metal working oil composition of this embodiment, it is possible to provide a metal working oil composition which conserves the natural environment, has improved workability, and generates a reduced amount of wear powder.

[0085] The metal working oil composition of the present embodiment exerts a favorable effect, particularly when used in machining aluminum. Therefore, the metal processing oil composition of the present embodiment is preferably a composition for processing aluminum. Furthermore, in the method for processing aluminum using the metal processing oil composition of the present embodiment, good effects are exhibited. Examples of the processing include cold rolling, drawing, ironing, drawing, pressing, cutting, and grinding. EXAMPLES

[0086] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples.

[0087] <Metalworking oil composition> The metal working oil compositions of Examples 1 to 17 and the metal working oil compositions of Comparative Examples 1 to 8 were prepared by blending the components in the blending ratios shown in Tables 1 to 3. In Tables 1 to 3, the numerical values ​​for component (A) indicate the content (mass%) of each base oil relative to the total amount of component (A), and for other components, the numerical values ​​indicate the content (parts by mass) of each component relative to the total amount (100 parts by mass) of component (A).

[0088] (1) Base oil (A) A1-1: 100% vegetable-derived lubricant base oil (product name "NovaSolv 160", manufactured by Novvi, kinematic viscosity at 40°C: 2.8mm 2 / s (Kinematic viscosity is measured according to ASTM D445). A2-1: Mineral oil (naphthenic hydrocarbon, density: 0.8259, kinematic viscosity at 40°C: 2.497mm 2 / s, 95% distillation temperature: 253.5℃, %C P :21.8,%C N :78,%C A : 0.2, aniline point: 75.8℃) A2-2: Mineral oil (naphthenic hydrocarbon, density: 0.8289, kinematic viscosity at 40°C: 4.979mm 2 / s, 95% distillation temperature: 310.5℃, %C P :32.8,%C N :67, %C A : 0.2, aniline point: 94.2℃) A2-3: Mineral oil (naphthenic hydrocarbon, density: 0.7939, kinematic viscosity at 40°C: 1.675mm 2 / s, 95% distillation temperature: 234.5℃, %C P :52.8,%C N :47, %C A : 0.2, aniline point: 77.4℃)

[0089] (2) Oily agent (C) C1-1: Lauryl alcohol C1-2: Myristyl alcohol C2-1: Butyl stearate C3-1: Tripropylene glycol C4-1: Oleic acid

[0090] The bio-based content in Tables 1 to 3 is a value measured in accordance with ASTM D6866. The 40°C kinematic viscosity is the kinematic viscosity at 40°C measured in accordance with JIS K2283:2000. The 95% distillation temperature is a value measured by GC distillation in accordance with JIS K2254 "Petroleum products - Distillation test method."

[0091] [Evaluation of workability] Using each of the metalworking oil compositions, aluminum cold rolling was carried out using a small rolling mill. Using a work roll with a diameter of 51 mm, an aluminum material (JIS A1050 material, 0.34 mm thick, 80 mm wide) was rolled at a rolling speed of 35 m / min. Starting from a reduction of 40%, the reduction was increased by 1% every 60 seconds to measure the maximum reduction at which rolling could be performed without surface damage. The results are shown in Tables 1 to 3 as "Rolling limit, %". A higher rolling limit value means better workability. <Measurement conditions> Metalworking oil composition supply amount: 6L / min Metalworking oil composition temperature: 40°C

[0092] [Evaluation of wear debris generation] In the above [Evaluation of workability], the metalworking oil composition of each example was sampled at a rolling reduction of 45%, and the amount of aluminum contained in the metalworking oil composition of each example was measured by atomic absorption spectrometry, and the amount of wear particles generated was measured. The results are shown in Tables 1 to 3 as "amount of wear particles generated, ppm".

[0093] [Removal evaluation] Aluminum test pieces (JIS A1050 material) of the same size (60 mm x 80 mm x 1.0 mm) as test piece B specified in JIS K2246 were polished and cleaned in accordance with JIS K2246, and then immersed in each of the metalworking oil compositions for 3 minutes. Thereafter, the test pieces were pulled out of the metalworking oil composition for each example and hung for 5 minutes, and 11 of these were stacked together. The overlapping test pieces were held horizontally, a 300 g weight was placed on the top, and the temperature was raised from room temperature to 350° C. over 150 minutes in an oven and held at that temperature for 60 minutes. After turning off the power and cooling to room temperature, the undersides of the overlapping surfaces were evaluated for stain formation. The evaluation was based on JIS K2246 Rust Formation Measurement Method, and the area of ​​discoloration caused by stains was judged from grades A to E. Grade A was given 0 points, grade B 1 point, grade C 2 points, grade D 3 points, and grade E 4 points, and the average of the 10 sheets was calculated. The results are shown in Tables 1 to 3 as "removability."

[0094] [Table 1]

[0095] [Table 2]

[0096] [Table 3]

[0097] As shown in Tables 1 to 3, it was confirmed that the metalworking oil compositions of the Examples are more environmentally friendly, have better processability, and reduce the amount of wear powder generated, compared to the metalworking oil compositions of the Comparative Examples.

Claims

1. A metal working oil composition comprising a base oil (A) and an oiliness agent (C), The base oil (A) comprises a hydrocarbon base oil (A1) having biomass-derived carbon and a hydrocarbon base oil (A2) not having biomass-derived carbon, The oily agent (C) includes one or more oily agents selected from esters and alcohols, the content of the hydrocarbon base oil (A1) having biomass-derived carbon is 1 mass% or more and 60 mass% or less based on the total amount of the base oil (A), a content of the biomass-derived carbon-free hydrocarbon base oil (A2) in the metal working oil composition is 40 mass % or more and 99 mass % or less, based on the total amount of the base oil (A).

2. The biomass-derived carbon-free hydrocarbon base oil (A2) has an aniline point of 100° C. or less and a % C Ｎ 2. The metal working oil composition of claim 1, comprising a hydrocarbon base oil having a % or more of

3. 3. The metal working oil composition according to claim 1, wherein the hydrocarbon base oil (A2) having no biomass-derived carbon is a mineral oil.

4. The 40° C. kinematic viscosity of the biomass-derived carbon-free hydrocarbon base oil (A2) is 6.00 mm ２ 3. The metal working oil composition according to claim 1, wherein the viscosity of the metal working oil composition is less than 1000 ppm.

5. 3. The metal working oil composition according to claim 1, wherein the 95% distillation temperature of the biomass-derived carbon-free hydrocarbon base oil (A2) is 380°C or lower.

6. The metal working oil composition according to claim 1 or 2, wherein the oiliness agent (C) contains an alcohol.

7. 3. The metal working oil composition according to claim 1, wherein the oily agent (C) contains a monohydric alcohol or an ester, and a polyalkylene glycol, and the ester is an ester having 7 to 26 carbon atoms obtained from a monohydric alcohol and a monobasic acid.

8. 3. The metal working oil composition according to claim 1, wherein the content of the hydrocarbon base oil (A2) having no biomass-derived carbon is 60 mass% or more and 99 mass% or less, based on the total amount of the base oil (A).

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