Water-soluble processing oil stock solution composition and metal processing method

Abstract

A water-soluble processing oil stock solution composition for metal processing after being diluted with water, the water-soluble processing oil stock solution composition containing a base oil, a sulfonate salt, a phosphoric acid ester, and water, the water content being 0.01-10 mass% with respect to 100 mass% of the total amount of the water-soluble processing oil stock solution composition.

Description

Technical Field

[0001] The present invention relates to a water-soluble processing oil stock liquid composition and a metal processing method.

[0002] This application claims priority based on Japanese Patent Application No. 2022-183993 filed on November 17, 2022, the contents of which are cited herein. Background Art

[0003] When metalworking such as turning, planing, drilling, milling, or so-called cutting or grinding is performed on steel or non-ferrous metal materials, a processing oil composition is used for the purpose of reducing friction between the tool and the workpiece or chips, removing chips, preventing the formation of built-up edge, suppressing heat generation, or cooling. In general, processing oil compositions are roughly divided into non-water-soluble processing oil compositions that have a lubricating effect as a main purpose and water-soluble processing oil compositions that have a cooling effect as a main purpose.

[0004] For example, a water-soluble cutting oil composition, which is a type of water-soluble processing oil composition, is classified into A1 type (emulsion type), A2 type (soluble type) and A3 type (solution type) in JIS K2241. All are substances used by diluting with water. A3 type is composed only of components soluble in water, but A1 type and A2 type also contain oily components that are insoluble in water. Therefore, for A1 type and A2 type, the dispersion stability of the oily components relative to water is required. In addition, in order to prevent corruption even when water is added, A1 type and A2 type often use oily components showing a higher pH. Therefore, when used for aluminum processing, it is also important not to corrode or discolor the aluminum as the processed material.

[0005] For water-soluble cutting oil compositions, users who have purchased the stock solution usually dilute the stock solution with water to 10 to 30 times and use it at an appropriate concentration. Therefore, the water-soluble cutting oil composition contains components that are easily soluble in water. Most of these components that are easily soluble in water are not sufficiently stable relative to the base oil that occupies most of the stock solution. When the stock solution is stored for a long time, the components that are easily soluble in water sometimes separate and settle. The supernatant is collected from containers such as barrels where the components that are easily soluble in water are separated and settled. Even if it is diluted with water for use, the original performance of the water-soluble cutting oil composition cannot be exerted, and sometimes poor processing and other undesirable conditions may occur. Therefore, when the components that are easily soluble in water are separated and settled, it is necessary to stir the contents, etc., but this will take time and cost, and reduce productivity.

[0006] In order to improve the performance of water-soluble cutting oil compositions, various additives have been studied.

[0007] For example, Patent Document 1 discloses a water-soluble cutting oil stock composition, which contains 0.3% by mass or more and 7.0% by mass or less of at least one amine compound selected from aromatic tertiary amines and heterocyclic tertiary amines, 0.1% by mass or more and 5.0% by mass or less of water, and 70% by mass or more and 98% by mass or less of mineral oil, based on the total amount of the stock composition. Patent Document 1 describes that the water-soluble cutting oil stock composition has excellent emulsion stability, corruption resistance, and processability.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: International Publication No. 2015 / 053192 Summary of the invention

[0011] Problems to be solved by the invention

[0012] However, although the water-soluble cutting oil stock solution composition described in Patent Document 1 can improve the emulsion stability after dilution with water, there is room for improvement in the storage stability in the stock solution state and the effect of preventing aluminum discoloration.

[0013] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a water-soluble processing oil stock solution composition having high storage stability in a stock solution state and capable of preventing aluminum from discoloring, and a metal processing method using the water-soluble processing oil stock solution composition diluted with water.

[0014] Means for solving problems

[0015] [1] A water-soluble processing oil stock composition, which is a water-soluble processing oil stock composition used for metal processing after being diluted with water, and contains a base oil, a sulfonate, a phosphate ester and water, wherein the content of the water is 0.01% by mass or more and 10% by mass or less relative to 100% by mass of the total amount of the water-soluble processing oil stock composition.

[0016] [2] The water-soluble processing oil stock composition according to [1], wherein the base oil contains mineral oil.

[0017] [3] The water-soluble processing oil stock fluid composition according to [1] or [2], wherein the sulfonate salt comprises an alkali metal sulfonate.

[0018] [4] The water-soluble processing oil stock composition according to any one of [1] to [3], wherein the phosphate ester comprises a compound represented by the following general formula (1):

[0019] [Chemical formula 1]

[0020]

[0021] [Where R 1 is a hydrocarbon group which may have a substituent. 2 and R 3 are each independently a hydrocarbon group which may have a substituent or a hydrogen atom.]

[0022] [5] The water-soluble machining oil stock composition according to any one of [1] to [4], which is used for cutting or grinding of metals.

[0023] [6] The water-soluble processing oil stock composition according to [5], wherein the metal comprises aluminum or an aluminum alloy.

[0024] [7] A metal processing method comprising: a dilution step of diluting the water-soluble processing oil stock composition described in any one of [1] to [6] with water to obtain a water-soluble processing oil composition; and a processing step of processing metal using the water-soluble processing oil composition.

[0025] Effects of the Invention

[0026] According to the present invention, a water-soluble processing oil stock solution composition having high stock solution stability and capable of preventing aluminum from discoloring, and a metal processing method using the water-soluble processing oil stock solution composition can be provided. It should be noted that, unless otherwise specified, the "stock solution stability" in this specification refers to the storage stability in the stock solution state. DETAILED DESCRIPTION

[0027] (Water-soluble processing oil stock composition)

[0028] The water-soluble processing oil stock composition of the present embodiment is a composition used for metal processing after being diluted with water.

[0029] From the viewpoint of improving stock solution stability, the sulfur content of the water-soluble processing oil stock solution composition of the present embodiment is preferably 0.01 mass % or more, more preferably 0.03 mass % or more, further preferably 0.07 mass % or more, and particularly preferably 0.1 mass % or more.

[0030] From the viewpoint of improving the working environment, the sulfur content of the water-soluble processing oil stock composition is preferably 2.0 mass % or less, more preferably 1.5 mass % or less, and even more preferably 1.0 mass % or less.

[0031] For example, the sulfur content of the water-soluble processing oil stock composition is preferably 0.01 mass % to 2.0 mass %, more preferably 0.03 mass % to 2.0 mass %, further preferably 0.07 mass % to 1.5 mass %, particularly preferably 0.1 mass % to 1.0 mass %.

[0032] In this specification, "sulfur content" means the sulfur content (mass %) measured by ICP emission spectrometry in JIS K 0116:2014.

[0033] From the viewpoint of improving the stability of the stock solution, the kinematic viscosity of the water-soluble processing oil stock solution composition of the present embodiment at 40° C. is preferably 35 mm 2 / s or less, more preferably 25mm 2 / s or less, more preferably 20mm 2 / s or less, particularly preferably 15mm 2 / s or less.

[0034] In addition, from the viewpoint of stock solution stability, the kinematic viscosity of the water-soluble processing oil stock solution composition at 40°C is preferably 2 mm 2 / s or more, more preferably 4mm 2 / s or more, more preferably 6mm 2 / s or more, particularly preferably 8mm 2 / s or more.

[0035] For example, the kinematic viscosity of the water-soluble processing oil stock composition at 40°C is preferably 2 mm 2 / s or more and 35mm 2 / s or less, more preferably 4mm 2 / s or more and 25mm 2 / s or less, more preferably 6mm 2 / s or more and 20mm 2 / s or less, particularly preferably 8mm 2 / s or more and 15mm 2 / s or less.

[0036] In this specification, "kinematic viscosity at 40°C" means the kinematic viscosity (mm2) at 40°C measured in accordance with JIS K 2283:2000. 2 / s).

[0037] The water-soluble processing oil stock composition of the present embodiment contains a base oil, a sulfonate, a phosphoric acid ester, and water.

[0038] <Base oil>

[0039] Examples of the base oil of the water-soluble processing oil stock composition of the present embodiment include mineral oil and synthetic oil.

[0040] <<Mineral Oil>>

[0041] As the mineral oil, a distillate obtained by distilling crude oil under normal pressure can be used, or a lubricating oil fraction obtained by refining a distillate obtained by further distilling the distillate under reduced pressure by various refining processes can be used.

[0042] As the refining process, it is possible to appropriately combine hydrotreating, solvent extraction, solvent dewaxing, hydrodewaxing, sulfuric acid washing, clay treatment, etc. By combining these refining processes in an appropriate order, a mineral oil can be obtained.

[0043] Alternatively, a mixture of a plurality of refined oils having different properties obtained by subjecting different crude oils or distillate oils to different refining processes may be used.

[0044] As the mineral oil, Group I base oil (hereinafter referred to as "API Group I base oil"), Group II base oil (hereinafter referred to as "API Group II base oil"), or Group III base oil (hereinafter referred to as "API Group III base oil") of the API base oil classification, or a mixed base oil thereof can be used.

[0045] API Group I base oil is a mineral oil-based base oil having a sulfur content exceeding 0.03% by mass and / or a saturated content of less than 90% by mass and a viscosity index of 80 or more and less than 120.

[0046] The API Group II base oil is a mineral oil-based base oil having a sulfur content of 0.03 mass % or less, a saturated content of 90 mass % or more, and a viscosity index of 80 or more and less than 120.

[0047] API Group III base oil is a mineral oil-based base oil having a sulfur content of 0.03 mass % or less, a saturated content of 90 mass % or more, and a viscosity index of 120 or more.

[0048] As the base oil of the water-soluble processing oil stock composition of the present embodiment, one mineral oil may be used alone or a mixture of multiple mineral oils may be used. In a mixed base oil containing multiple mineral oils, the API classifications of these mineral oils may be the same or different.

[0049] Synthetic Oil

[0050] Examples of the synthetic oil include polyolefins such as poly-α-olefins, ester base oils such as diesters and polyol esters, polyalkylene glycols, alkylbenzenes, and alkylnaphthalenes.

[0051] As the base oil of the water-soluble processing oil stock composition of the present embodiment, one type of synthetic oil may be used alone, or a plurality of types of synthetic oils may be used as a mixture.

[0052] As the base oil of the water-soluble processing oil stock composition of the present embodiment, any of mineral oil and synthetic oil may be used, or a mixture of these may be used.

[0053] As the base oil of the water-soluble processing oil stock solution composition of the present embodiment, among the above, from the viewpoint of further improving the stock solution stability and the effect of preventing aluminum discoloration, it is preferable to contain a mineral oil, and it is more preferable to contain an API Group I base oil.

[0054] From the viewpoint of improving the stability of the stock solution, the sulfur content of the base oil is preferably 0.01 mass % or more, more preferably 0.03 mass % or more, further preferably 0.07 mass % or more, and particularly preferably 0.1 mass % or more.

[0055] From the viewpoint of improving the working environment, the sulfur content of the base oil is preferably 2.0 mass % or less, more preferably 1.5 mass % or less, and even more preferably 1.0 mass % or less.

[0056] For example, the sulfur content of the base oil is preferably 0.01 mass % to 2.0 mass %, more preferably 0.03 mass % to 2.0 mass %, further preferably 0.07 mass % to 1.5 mass %, particularly preferably 0.1 mass % to 1.0 mass %.

[0057] From the viewpoint of improving the stability of the stock solution, the kinematic viscosity of the base oil of the water-soluble processing oil stock solution composition of the present embodiment at 40° C. is preferably 35 mm 2 / s or less, more preferably 25mm 2 / s or less, more preferably 20mm 2 / s or less, particularly preferably 15mm 2 / s or less.

[0058] In addition, from the viewpoint of stock solution stability, the kinematic viscosity of the base oil of the water-soluble processing oil stock solution composition of the present embodiment at 40° C. is preferably 2 mm 2 / s or more, more preferably 4mm 2 / s or more, more preferably 6mm 2 / s or more, particularly preferably 8mm 2 / s or more.

[0059] For example, the kinematic viscosity of the base oil at 40°C is preferably 2 mm 2 / s or more and 35mm 2 / s or less, more preferably 4mm 2 / s or more and 25mm 2 / s or less, more preferably 6mm 2 / s or more and 20mm2 / s or less, particularly preferably 8mm 2 / s or more and 15mm 2 / s or less.

[0060] The content of the base oil in the water-soluble processing oil stock composition of this embodiment is preferably 75 mass % or more, more preferably 80 mass % or more, and even more preferably 85 mass % or more, based on the total amount of the water-soluble processing oil stock composition.

[0061] The content of the base oil in the water-soluble processing oil stock solution composition of the present embodiment is preferably 99% by mass or less, more preferably 98% by mass or less, based on the total amount of the water-soluble processing oil stock solution composition.

[0062] For example, relative to the total amount of the water-soluble processing oil stock liquid composition, the base oil content of the water-soluble processing oil stock liquid composition of the present embodiment is preferably greater than 75 mass % and less than 99 mass %, more preferably greater than 80 mass % and less than 98 mass %, and further preferably greater than 85 mass % and less than 98 mass %.

[0063] When the content of the base oil in the water-soluble processing oil stock composition of the present embodiment is equal to or greater than the above-described preferred lower limit, the effect of preventing aluminum discoloration is further enhanced.

[0064] When the content of the base oil in the water-soluble processing oil stock solution composition of the present embodiment is equal to or less than the above-mentioned preferred upper limit value, the stock solution stability is further improved.

[0065] <Sulfonate>

[0066] The water-soluble processing oil stock composition of the present embodiment contains a sulfonate as a surfactant. Examples of the sulfonate include alkali metal sulfonates, alkaline earth metal sulfonates, and amine sulfonates.

[0067] The sulfonate in the present embodiment can be obtained by reacting an alkali metal, an alkaline earth metal or an amine with a sulfonic acid.

[0068] ●Alkali metals and alkaline earth metals

[0069] As the alkali metal used as the raw material of the alkali metal sulfonate, sodium and potassium are preferred from the viewpoint of further improving the effect of preventing aluminum discoloration. In addition, as the alkaline earth metal used as the raw material of the alkaline earth metal sulfonate, magnesium, calcium and barium are preferred. Among them, sodium and potassium are more preferred, and sodium is further preferred.

[0070] Amine

[0071] Examples of the amine used as a raw material for the sulfonic acid amine salt include monoamines, alkanolamines, and polyamines.

[0072] Examples of the monoamine include primary amines, secondary amines, and tertiary amines.

[0073] Specific examples of the primary amine include ethylamine, n-propylamine, butylamine, 1-ethylbutylamine, 1,3-diaminopropane, and cyclohexylamine.

[0074] Specific examples of the secondary amine include diethylamine, di-n-propylamine, di-n-butylamine, 4,4′-diaminodiphenylamine, diethylenetriamine, tetraethylenepentamine, and N-(2-aminoethyl)ethanolamine.

[0075] Specific examples of the tertiary amine include dimethylethylamine, diethylmethylamine, triethylamine, and tributylamine.

[0076] Specific examples of the alkanolamine include monoethanolamine, diethanolamine, triethanolamine, diethylethanolamine, and propanolamine.

[0077] Specific examples of the polyamine include alkylene polyamines such as ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, propylenediamine, dipropylenetriamine, tripropylenetetramine, tetrapropylenepentamine, pentapropylenehexamine, butylenediamine, dibutylenetriamine, tributylenetetramine, tetrabutylenepentamine, and pentabutylenehexamine; N-alkylethylenediamines such as N-methylethylenediamine, N-ethylethylenediamine, and N-propylethylenediamine; N-alkenylethylenediamines such as N-vinylethylenediamine, N-propyleneethylenediamine, and N-butenylethylenediamine; N-alkyl or N-alkenylalkylene polyamines such as N-alkyldiethylenetriamine, N-alkenyldiethylenetriamine, and N-alkyltriethylenetetramine, etc. In addition, the above-mentioned polyamines also include polyamines derived from fats and oils (such as tallow polyamine).

[0078] ■Sulfonic acid

[0079] As the sulfonic acid used as the raw material of the sulfonate, a known sulfonic acid produced by a conventional method can be used, and specific examples thereof include petroleum sulfonic acid and synthetic sulfonic acid.

[0080] ■■Petroleum sulfonic acid

[0081] Petroleum sulfonic acid is generally obtained by sulfonating alkyl aromatic compounds in the lubricating oil fraction of mineral oil, or is produced as a by-product in the production of white oil.

[0082] ■■Synthetic sulfonic acid

[0083] Synthetic sulfonic acids include byproducts of alkylbenzene manufacturing facilities that are raw materials for detergents, etc., or sulfonated alkylbenzenes having linear or branched alkyl groups obtained by adding olefins to benzene, or sulfonated alkylnaphthalenes such as dinonylnaphthalene, etc. The molecular weight of these sulfonic acids is not particularly limited, but preferably sulfonic acids of 100 to 1500 are used, and more preferably sulfonic acids of 200 to 700 are used.

[0084] Among the above sulfonic acids, alkylarylsulfonic acids are preferably used, and among them, at least one selected from the group consisting of dialkylnaphthalenesulfonic acids in which the total number of carbon atoms of the two alkyl groups bonded to the naphthalene ring is 14 to 30; dialkylbenzenesulfonic acids in which the two alkyl groups bonded to the benzene ring are each a linear alkyl group or a branched alkyl group having one side chain methyl group and the total number of carbon atoms of the two alkyl groups is 14 to 30; and monoalkylbenzenesulfonic acids in which the number of carbon atoms of the alkyl group bonded to the benzene ring is 15 or more is more preferred. Alkylarylsulfonic acids are preferably used, and among them, at least one selected from the group consisting of dialkylnaphthalenesulfonic acids in which the total number of carbon atoms of the two alkyl groups bonded to the naphthalene ring is 14 to 30; and monoalkylbenzenesulfonic acids in which the number of carbon atoms of the alkyl group bonded to the benzene ring is 15 or more is more preferred.

[0085] In addition, in this specification, "the carbon number is X to Y" means having X or more and Y or less carbon atoms.

[0086] In addition, in this specification, "alkylarylsulfonic acid" means a compound in which a part or all of the hydrogen atoms in the aryl group of arylsulfonic acid are substituted with alkyl groups.

[0087] …Dialkylnaphthalenesulfonic acid

[0088] The dialkylnaphthalenesulfonic acid in which the total carbon number of the two alkyl groups bonded to the naphthalene ring is 14 to 30 has improved demulsibility if the total carbon number of the two alkyl groups is 14 or more, and further improved stock solution stability if the total carbon number of the two alkyl groups is 30 or less. It should be noted that the two alkyl groups may be linear or branched, and are preferably linear.

[0089] In the above, the total number of carbon atoms in the two alkyl groups bonded to the naphthalene ring is preferably 14-25, and more preferably 14-20.

[0090] The carbon number of each of the two alkyl groups is preferably 6 to 18, more preferably 6 to 12.

[0091] …Dialkylbenzenesulfonic acid

[0092] The dialkylbenzenesulfonic acid in which the two alkyl groups bonded to the benzene ring are each a linear alkyl group or a branched alkyl group having one side chain methyl group, and the total number of carbon atoms of the two alkyl groups is 14 to 30, has improved demulsibility if the number of carbon atoms of the alkyl group is 14 or more, and further improved stock solution stability if the number of carbon atoms of the alkyl group is 30 or less. It should be noted that, if the total number of carbon atoms of the two alkyl groups bonded to the benzene ring is 14 to 30, the number of carbon atoms of each alkyl group is not particularly limited, and the number of carbon atoms of each alkyl group is preferably 6 to 18.

[0093] ···Monoalkylbenzenesulfonic acid

[0094] The stock solution stability is further improved when the carbon number of one alkyl group bonded to the benzene ring is 15 or more and the carbon number of the monoalkylbenzenesulfonic acid is 15 or more. The alkyl group bonded to the benzene ring may be linear or branched, but is preferably linear.

[0095] The number of carbon atoms in one alkyl group bonded to the benzene ring is preferably 16-30, more preferably 18-28.

[0096] As the sulfonate of the water-soluble processing oil stock composition of the present embodiment, among the above, from the viewpoint of further improving the stock solution stability and the effect of preventing aluminum discoloration, preferably an alkali metal sulfonate, more preferably an alkali metal alkyl aryl sulfonate.

[0097] As the sulfonate of the water-soluble processing oil stock composition of the present embodiment, specifically, the following sulfonates can be mentioned. That is, neutral (normal salt) sulfonates obtained by reacting alkali metal alkali (alkali metal oxide or hydroxide, etc.), alkaline earth metal alkali (alkaline earth metal oxide or hydroxide, etc.) or amine with sulfonic acid; basic sulfonates obtained by heating the above neutral sulfonates with an excess of alkali metal alkali, alkaline earth metal alkali or amine in the presence of water; carbonate overbased (superbased) sulfonates obtained by reacting the above neutral sulfonates with alkali metal alkali, alkaline earth metal alkali or amine in the presence of carbon dioxide gas; borate overbased sulfonates obtained by reacting the above neutral sulfonates with alkali metal alkali, alkaline earth metal alkali or amine and a boric acid compound such as boric acid or boric anhydride, or reacting the above carbonate overbased sulfonates with a boric acid compound such as boric acid or boric anhydride, and mixtures thereof.

[0098] The sulfonate in the water-soluble processing oil stock composition of the present embodiment may be used alone or in combination of two or more.

[0099] The content of the sulfonate in the water-soluble processing oil stock composition of the present embodiment is preferably 0.1 mass % or more, more preferably 0.5 mass % or more, and even more preferably 1.0 mass % or more, based on the total amount of the water-soluble processing oil stock composition.

[0100] The content of the sulfonate in the water-soluble processing oil stock composition of the present embodiment is preferably 10% by mass or less, more preferably 7.0% by mass or less, and even more preferably 5.0% by mass or less, based on the total amount of the water-soluble processing oil stock composition.

[0101] For example, the content of the sulfonate in the water-soluble processing oil stock composition of the present embodiment is preferably 0.1 mass % to 10 mass %, more preferably 0.5 mass % to 7.0 mass %, and further preferably 1.0 mass % to 5.0 mass %, relative to the total amount of the water-soluble processing oil stock composition.

[0102] When the content of the sulfonate in the water-soluble processing oil stock solution composition of the present embodiment is within the above-mentioned preferred range, the stock solution stability is further improved.

[0103] <Phosphate ester>

[0104] The water-soluble processing oil stock composition of the present embodiment contains a phosphoric acid ester as an oiliness agent. Examples of the phosphoric acid ester include phosphoric acid monoesters, phosphoric acid diesters, phosphoric acid triesters, and amine salts of these phosphoric acid esters.

[0105] As the phosphate ester of the water-soluble processing oil stock composition of the present embodiment, a compound represented by the following general formula (1) is preferred from the viewpoint of improving the adsorption property to the aluminum surface.

[0106] [Chemical formula 2]

[0107]

[0108] [Where R 1 is a hydrocarbon group which may have a substituent. 2 and R 3 are each independently a hydrocarbon group which may have a substituent or a hydrogen atom.]

[0109] In the above general formula (1), R 1 ~R 3 The hydrocarbon groups in are each independently preferably a hydrocarbon group having 2 to 30 carbon atoms, more preferably a hydrocarbon group having 3 to 20 carbon atoms, further preferably a hydrocarbon group having 3 to 18 carbon atoms, and particularly preferably a hydrocarbon group having 3 to 10 carbon atoms.

[0110] It should be noted that in formula (1), R 2 and R 3 Phosphate esters in which all the atoms are hydrogen are monophosphate esters, and phosphate esters in which any one of the atoms is hydrogen are diesters. They are acidic phosphate esters.

[0111] In addition, in formula (1), R 2 and R 3 Phosphoric acid esters that are all hydrocarbon groups are called triesters of phosphoric acid.

[0112] Specific examples of the hydrocarbon group having 2 to 30 carbon atoms include alkyl groups such as ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl and octadecyl (these alkyl groups may be linear or branched); alkenyl groups such as butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl and octadecenyl (these alkenyl groups may be linear or branched, and the position of the double bond is arbitrary); cycloalkyl groups having 5 to 7 carbon atoms such as cyclopentyl, cyclohexyl and cycloheptyl; methylcyclopentyl, dimethylcyclopentyl, methylethylcyclopentyl, diethylcyclopentyl, Alkylcycloalkyl groups having 6 to 11 carbon atoms, such as methylcyclohexyl, dimethylcyclohexyl, methylethylcyclohexyl, diethylcyclohexyl, methylcycloheptyl, dimethylcycloheptyl, methylethylcycloheptyl, and diethylcycloheptyl (the substitution position of the alkyl group on the cycloalkyl group is also arbitrary); aryl groups, such as phenyl and naphthyl; alkylaryl groups having 7 to 18 carbon atoms, such as tolyl, xylyl, ethylphenyl, propylphenyl, butylphenyl, pentylphenyl, hexylphenyl, heptylphenyl, octylphenyl, nonylphenyl, decylphenyl, undecylphenyl, and dodecylphenyl (the alkyl group may be linear or branched, and the substitution position on the aryl group is also arbitrary); arylalkyl groups having 7 to 12 carbon atoms, such as benzyl, phenylethyl, phenylpropyl, phenylbutyl, phenylpentyl, and phenylhexyl (these alkyl groups may be linear or branched); and the like.

[0113] As R 1 ~R 3 The hydrocarbon group in is preferably a linear or branched alkyl group having 3 to 10 carbon atoms, more preferably a linear alkyl group having 3 to 10 carbon atoms, and still more preferably a linear alkyl group having 6 to 10 carbon atoms, among the above.

[0114] R 1 ~R 3 The hydrocarbon group in may have a substituent, and examples of the substituent include an alkoxy group and a hydroxyl group.

[0115] Preferred specific examples of triesters of phosphate include trialkyl phosphates (the alkyl group may be linear or branched) such as tripropyl phosphate, tributyl phosphate, tripentyl phosphate, trihexyl phosphate, triheptyl phosphate, and trioctyl phosphate; and tri(alkyl)aryl phosphates such as triphenyl phosphate and tricresyl phosphate.

[0116] Specific examples of acidic phosphates include monoalkyl phosphates such as monopropyl phosphate, monobutyl phosphate, monopentyl phosphate, monohexyl phosphate, monoheptyl phosphate, and monooctyl phosphate (the alkyl group may be linear or branched); mono(alkyl)aryl phosphates such as monophenyl phosphate and monocresyl phosphate; dialkyl phosphates such as dipropyl phosphate, dibutyl phosphate, dipentyl phosphate, dihexyl phosphate, diheptyl phosphate, and dioctyl phosphate (the alkyl group may be linear or branched); di(alkyl)aryl phosphates such as diphenyl phosphate and dicresyl phosphate, and the like.

[0117] As the phosphate ester of the water-soluble processing oil stock composition of the present embodiment, from the viewpoint of further improving the effect of preventing aluminum discoloration, among the above, acidic phosphate esters are preferred, phosphoric acid diesters are more preferred, and dialkyl phosphates are further preferred.

[0118] The dialkyl phosphate is preferably a dialkyl phosphate having a hydrocarbon group having 3 to 10 carbon atoms, more preferably a dialkyl phosphate having a linear or branched alkyl group having 3 to 10 carbon atoms, and still more preferably a dialkyl phosphate having a linear alkyl group having 3 to 10 carbon atoms.

[0119] The phosphate ester in the water-soluble processing oil stock composition of the present embodiment may be used alone or in combination of two or more.

[0120] The content of the phosphate ester in the water-soluble processing oil stock composition of the present embodiment is preferably 0.01 mass % or more, more preferably 0.1 mass % or more, and even more preferably 0.5 mass % or more, based on the total amount of the water-soluble processing oil stock composition.

[0121] The content of the phosphate ester in the water-soluble processing oil stock composition of the present embodiment is preferably 10 mass % or less, more preferably 5.0 mass % or less, and even more preferably 4.0 mass % or less, based on the total amount of the water-soluble processing oil stock composition.

[0122] For example, relative to the total amount of the water-soluble processing oil stock composition, the content of phosphate ester in the water-soluble processing oil stock composition of the present embodiment is preferably 0.01 mass % to 10 mass %, more preferably 0.1 mass % to 5.0 mass %, and further preferably 0.5 mass % to 4.0 mass %.

[0123] When the content of the phosphoric acid ester in the water-soluble processing oil stock composition of the present embodiment is equal to or greater than the above-described preferred lower limit, the effect of preventing aluminum discoloration is further enhanced.

[0124] When the content of the phosphoric acid ester in the water-soluble processing oil stock solution composition of the present embodiment is equal to or less than the above-described preferred upper limit value, the stock solution stability is further improved.

[0125] <Water>

[0126] Examples of water in the water-soluble processing oil stock composition of the present embodiment include tap water, industrial water, pure water, deionized water, ion-exchanged water, and well water.

[0127] The water in the water-soluble processing oil stock liquid composition of the present embodiment may be used alone or in combination of two or more.

[0128] The water content of the water-soluble processing oil stock composition of the present embodiment is 0.01 mass % or more, preferably 0.05 mass % or more, more preferably 0.08 mass % or more, and further preferably 0.1 mass % or more, based on the total amount of the water-soluble processing oil stock composition.

[0129] The water content of the water-soluble processing oil stock composition of the present embodiment is 10 mass % or less, preferably 7 mass % or less, more preferably 5 mass % or less, and further preferably 3 mass % or less, based on the total amount of the water-soluble processing oil stock composition.

[0130] For example, the water content of the water-soluble processing oil stock liquid composition of the present embodiment is greater than 0.01 mass % and less than 10 mass %, preferably greater than 0.05 mass % and less than 7 mass %, more preferably greater than 0.08 mass % and less than 5 mass %, and further preferably greater than 0.1 mass % and less than 3 mass %, relative to the total amount of the water-soluble processing oil stock liquid composition.

[0131] When the water content of the water-soluble processing oil stock solution composition of the present embodiment is 0.01 mass % or more, the stock solution stability is improved. In addition, when the water content is equal to or more than the above-mentioned preferred lower limit, the stock solution stability is further improved.

[0132] If the water content of the water-soluble processing oil stock solution composition of the present embodiment is 10% by mass or less, the workability and stock solution stability are improved. In addition, if the water content is below the above-mentioned preferred upper limit, the workability and stock solution stability are further improved.

[0133] <Optional Ingredients>

[0134] The water-soluble processing oil stock composition of the present embodiment may contain any component other than the above-mentioned base oil, sulfonate, phosphate ester and water. Examples of such optional components include antioxidants, corrosion inhibitors, defoamers, antiwear agents and pour point depressants.

[0135] As antioxidants, for example, phenolic compounds such as 2,6-di-tert-butylphenol and 2,6-di-tert-butyl-p-cresol; amine compounds such as diphenylamine, dialkyldiphenylamine, phenyl-α-naphthylamine, and p-alkylphenyl-α-naphthylamine can be cited. When the water-soluble processing oil stock composition contains an antioxidant, its content is, for example, 0.5 to 10% by mass relative to the total amount of the water-soluble processing oil stock composition. The antioxidant can be used alone or in combination of multiple antioxidants.

[0136] As the anticorrosive agent, for example, known anticorrosive agents such as benzotriazole compounds, tolyltriazole compounds, thiadiazole compounds and imidazole compounds can be used. When the water-soluble processing oil stock composition contains an anticorrosive agent, its content is, for example, 0.01 to 10% by mass relative to the total amount of the water-soluble processing oil stock composition. The anticorrosive agent can be used alone or in combination of multiple anticorrosive agents.

[0137] Examples of the defoaming agent include silicone-based defoaming agents.

[0138] Examples of the antiwear agent include dithiocarbamates, zinc dithiocarbamates, molybdenum dithiocarbamates, disulfides, polysulfides, olefin sulfides, and grease sulfides.

[0139] Examples of the pour point depressant include polymethacrylate-based polymers suitable for the base oil.

[0140] The water-soluble processing oil stock composition of the present embodiment described above contains sulfonate and phosphate as additives and a specific amount of water, thereby improving the dispersibility of each component in the water-soluble processing oil stock composition. In addition, a combination of additives that improve dispersibility and have little effect on aluminum is used.

[0141] Therefore, the water-soluble processing oil stock solution composition of the present embodiment has high stock solution stability and can prevent aluminum from being discolored.

[0142] The water-soluble machining oil stock composition of the present embodiment is useful for cutting or grinding of a metal workpiece.

[0143] Specifically, the metal workpiece includes one or more metals selected from the group consisting of aluminum, aluminum alloys, copper, copper alloys, iron, and alloys containing iron as a main component (such as steel, stainless steel, etc.), among which aluminum and aluminum alloys are preferred.

[0144] (Metal Processing Methods)

[0145] The metal processing method of the present embodiment comprises a dilution step of diluting a water-soluble processing oil stock composition with water to obtain a water-soluble processing oil composition, and a processing step of processing the metal using the water-soluble processing oil composition.

[0146] [Dilution process]

[0147] The dilution step is a step of diluting the water-soluble machining oil stock composition of the above embodiment with water to obtain a water-soluble machining oil composition. This step is performed in accordance with JIS K2241, "Method for preparing water-soluble cutting oils of cutting oils", to obtain a dilution of a predetermined ratio.

[0148] The water used in the dilution step may be the same water as that used in the water-soluble processing oil stock composition of the above-mentioned embodiment.

[0149] From the viewpoint of cooling performance, the dilution ratio of the water-soluble processing oil stock solution composition is preferably 5 times or more, more preferably 7 times or more, and even more preferably 10 times or more in terms of volume ratio relative to the water-soluble processing oil stock solution composition.

[0150] From the viewpoint of processability, the dilution ratio of the water-soluble processing oil stock solution composition is preferably 50 times or less, more preferably 40 times or less, and even more preferably 30 times or less in terms of volume ratio relative to the water-soluble processing oil stock solution composition.

[0151] In one embodiment, the dilution ratio of the water-soluble processing oil stock solution composition in the dilution step is preferably 5 times or more and 50 times or less, more preferably 7 times or more and 40 times or less, and further preferably 10 times or more and 30 times or less, in terms of volume ratio relative to the water-soluble processing oil stock solution composition.

[0152] If the dilution ratio of the water-soluble processing oil stock composition in the dilution process is within the above-mentioned preferred range, there will be no significant change in the viscosity of the diluted water-soluble processing oil stock composition, no inversion of the emulsion, etc. In addition, the concentration of each component of the water-soluble processing oil stock composition will become sufficient, and metal processing will be more stable.

[0153] [Processing steps]

[0154] The processing step is a step of processing metal using the water-soluble processing oil composition.

[0155] Examples of the metal include aluminum, aluminum alloys, copper, copper alloys, iron, and alloys containing iron as a main component (for example, steel and stainless steel), and metals containing two or more of these.

[0156] Examples of the processing include cutting and grinding, and a known device can be used for the cutting and grinding.

[0157] Since the metal processing method of the present embodiment uses the water-soluble processing oil stock liquid composition of the above-mentioned embodiment, processing can be performed without discoloration even if the metal is aluminum.

[0158] Example

[0159] The present invention will be described in more detail below using examples, but the present invention is not limited to these examples.

[0160] <Preparation of Water-Soluble Processing Oil Stock Liquid Composition>

[0161] (Examples 1 to 11, Comparative Examples 1 to 6)

[0162] The water-soluble processing oil stock solution composition of each example was prepared using the components shown in Tables 1 and 2. The numerical values ​​described in the component column of each example refer to the content (mass %) based on the total amount of the water-soluble processing oil stock solution composition of each component.

[0163] It should be noted that the water-soluble processing oil stock composition of Comparative Example 6 has a higher water content than other water-soluble processing oil stock compositions, so the viscosity becomes too high and cannot be tolerated from the viewpoint of workability. Therefore, the following evaluation was not performed on the water-soluble processing oil stock composition of Comparative Example 6.

[0164] [Evaluation of stock solution stability]

[0165] 50 g of the water-soluble processing oil stock solution composition of each example was added to a 100 mL spiral tube, and the tube was left to stand in a thermostatic bath at 0° C. The presence of separation and precipitation was visually confirmed at 24-hour intervals.

[0166] For compositions without isolated precipitates, evaluation was continued for a maximum of 30 days (720 hours).

[0167] The water-soluble processing oil stock solution composition that did not separate or precipitate after 600 hours was evaluated as A, and the water-soluble processing oil stock solution composition that separated or precipitated before that was evaluated as B. The results are shown in Tables 1 and 2.

[0168] In addition, the last observation time at which separation and precipitation were not observed is recorded in the lower part of the evaluation in Tables 1 and 2. For example, a numerical value such as "624" means that separation and precipitation were not observed after 624 hours, but separation and precipitation were observed after 648 hours. The water-soluble process oil stock solution composition for which no numerical value is recorded is a water-soluble process oil stock solution composition in which separation and precipitation did not occur for 30 days.

[0169] [Evaluation of the effect of preventing aluminum discoloration]

[0170] The water-soluble processing oil stock composition of each example was diluted to 10 times by volume with ion exchange water to obtain the water-soluble processing oil composition of each example. 50g of the water-soluble processing oil composition of each example was placed in a 100mL beaker, and while stirring at 100rpm with a magnetic stirrer, an aluminum test piece (ADC12 material: 10mm×50mm×3mm) was half immersed in the beaker at room temperature (25°C). The aluminum test piece was observed every 24 hours for discoloration. In the case of no discoloration, the evaluation was continued for up to 7 days (168 hours).

[0171] The water-soluble processing oil composition that did not discolor the aluminum test piece after 144 hours was evaluated as A, and the water-soluble processing oil composition that discolored the aluminum test piece before that was evaluated as B. The results are shown in Tables 1 and 2.

[0172] In addition, the last observation time at which no discoloration of the aluminum test piece was observed is described below the evaluation in Tables 1 and 2. For example, a numerical value such as "144" means that no discoloration was observed after 144 hours, but discoloration was observed after 168 hours. A water-soluble processing oil composition for which no numerical value is described is a water-soluble processing oil composition that did not cause discoloration of the aluminum test piece for 7 days.

[0173]

[0174] Table 2

[0175]

[0176] In Tables 1 and 2, the abbreviations have the following meanings, respectively.

[0177] A1: Mineral oil (API Group I base oil, kinematic viscosity at 40°C: 9.6 mm 2 / s, sulfur content: 0.17 mass %)

[0178] A2: Mineral oil (API Group I base oil, kinematic viscosity at 40°C: 12.3 mm 2 / s, sulfur content: 0.01 mass%)

[0179] A3: Mineral oil (API Group I base oil, kinematic viscosity at 40°C: 32.7 mm 2 / s, sulfur content: 0.45 mass%)

[0180] A4: Mineral oil (API Group I base oil, kinematic viscosity at 40°C: 2.3 mm 2 / s, sulfur content: 0.01 mass%)

[0181] B1: Sodium dinonylnaphthalenesulfonate

[0182] B2: Potassium dinonylnaphthalenesulfonate

[0183] B3: Barium dinonylnaphthalenesulfonate

[0184] b1: triethanolamine

[0185] E1: Di-n-octyl phosphate

[0186] e1: Methyl oleate

[0187] W: Ion exchange water

[0188] As shown in Table 1, it was confirmed that the water-soluble processing oil stock solution composition of the example had high stock solution stability and could prevent aluminum from being discolored.

[0189] On the other hand, the water-soluble processing oil stock solution compositions of Comparative Example 1 containing no sulfonate, Comparative Example 3 containing no water, and Comparative Example 5 using a surfactant other than sulfonate were inferior in stock solution stability.

[0190] In addition, the water-soluble processing oil stock solution compositions of Comparative Example 2 containing no phosphate ester and Comparative Example 4 using an oiliness agent other than phosphate ester were poor in the effect of preventing aluminum discoloration.

[0191] The water-soluble processing oil stock liquid composition of Comparative Example 6 containing more than 10% by mass of water was not durable as described above.

[0192] The preferred embodiments of the present invention have been described above, but the present invention is not limited to these embodiments. Addition, omission, substitution and other changes of the structure can be made without departing from the scope of the present invention. The present invention is not limited to the foregoing description, but is limited only by the scope of the attached claims.

Claims

1. A water-soluble processing oil stock liquid composition, which is a water-soluble processing oil stock liquid composition used for metal processing after dilution with water, It contains base oil, sulfonate, phosphate ester and water. The content of the water is 0.01% by mass or more and 10% by mass or less relative to 100% by mass of the total amount of the water-soluble processing oil stock composition.

2. The water-soluble processing oil stock composition according to claim 1, wherein The base oil comprises mineral oil.

3. The water-soluble processing oil stock composition according to claim 1, wherein The sulfonate salt comprises an alkali metal sulfonate.

4. The water-soluble processing oil stock composition according to claim 1, wherein The phosphate ester comprises a compound represented by the following general formula (1): In the formula, R 1 is a hydrocarbon group which may have a substituent, R 2 and R 3 Each independently represents a hydrocarbon group which may have a substituent or a hydrogen atom.

5. The water-soluble processing oil stock composition according to claim 1, wherein The water-soluble processing oil stock liquid composition is used for cutting or grinding of metals.

6. The water-soluble processing oil stock liquid composition according to claim 5, wherein The metal includes aluminum or an aluminum alloy.

7. A method for processing a metal, comprising the following steps: A dilution step of diluting the water-soluble process oil stock composition according to any one of claims 1 to 6 with water to obtain a water-soluble process oil composition; and A processing step of performing metal processing using the water-soluble processing oil composition.

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