JP2009242743A - Water-soluble lubricant for metalworking - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-soluble lubricant for metalworking which has excellent working performance in metalworking both for nonferrous metal such as aluminum and iron metal such as iron and steel, and simultaneously has satisfactory conformability with an adhesive. <P>SOLUTION: The water-soluble lubricant for metalworking is obtained by blending: (A) at least one kind of hydroxyfatty acid compound selected from hydroxyfatty acids, polycondensates of hydroxyfatty acid and dehydrative condensation products of hydroxyfatty acids or polycondensates thereof with fatty acids; (B) an 8 to 20C fatty acid; (C) at least one kind of basic compound selected from alkali metal hydroxides and alkanolamines; (D) an 8 to 20C normal chain olefin; and (E) a nonionic surfactant. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a water-soluble metal processing lubricant, and more particularly to a water-soluble metal processing lubricant that can be suitably used in any metal processing of non-ferrous metals such as aluminum and iron metals such as steel.

In recent years, the amount of aluminum has been increasing as a material used in the manufacture of automobiles in order to achieve improved fuel economy by reducing the weight of the automobile. Such changes in the manufacture of automobiles include metal processing equipment and metal processing processes that form and process non-ferrous metal parts such as aluminum and its alloys, as well as steel and other conventional metal parts. Indicates that it is necessary.
However, as a metal working lubricant used for metal working such as press working, a different lubricant is usually used depending on the type of workpiece. For example, when the workpiece is a non-ferrous metal and when it is a ferrous metal, the processing performance required for the metal processing lubricant is different, and therefore different oil agents are usually used. In other words, when a non-ferrous metal oil is used as a ferrous metal processing oil or a ferrous metal oil is used for non-ferrous metal processing, these molded products are not always satisfactory.

Under these circumstances, in factories that process both non-ferrous metals and ferrous metals, such as automobile manufacturing, it is necessary to install processing facilities for ferrous metals (processing lines) and processing facilities for non-ferrous metals separately. It is. Therefore, there are problems that necessary facilities and facility costs increase and work efficiency decreases.
In order to solve such problems, it is necessary to develop an oil agent that exhibits good processing performance (moldability) regardless of whether the workpiece is a non-ferrous metal or an iron metal. With such an oil agent, it is possible to process ferrous metal and non-ferrous metal with a common processing facility (processing line).

Further, in metal processing, it is required that the above processing performance is excellent and various other performances are satisfied. For example, in the manufacture of automobile parts, compatibility with adhesives, that is, because metal processed products (parts) or metal processed products and other material parts are assembled and assembled, the adhesion between them is excellent. Required. Therefore, good adhesion (adhesion compatibility) is essential.
Furthermore, the metal processing oil is naturally required to have basic performance such as rust prevention, degreasing, and storage stability.

  The present invention has been made under the circumstances as described above, and has excellent processing performance in both metal processing of non-ferrous metals such as aluminum and ferrous metals such as iron and steel, and at the same time compatibility with adhesives. An object of the present invention is to provide a good water-soluble metal processing lubricant.

  As a result of intensive studies to achieve the above object, the present inventors have found that the above-mentioned problems can be solved by a lubricant comprising a specific hydroxy fatty acid compound, a specific fatty acid, or the like. The present invention has been completed based on such findings.

That is, the present invention
(1) (A) Hydroxy fatty acid, polycondensate of hydroxy fatty acid, and at least one hydroxy fatty acid compound selected from hydroxy fatty acid or polycondensate of hydroxy fatty acid and dehydration condensate of fatty acid, (B) carbon number 8-20 A fatty acid, (C) at least one basic compound selected from an alkali metal hydroxide and an organic amine compound, (D) a linear olefin having 8 to 20 carbon atoms, and (E) a nonionic surfactant. A water-soluble metal processing lubricant,
(2) 10-60 mass% of (A) component, 3-30 mass% of (B) component, 0.5-30 mass% of (D) component, 3 (E) component on the basis of the total amount of lubricant In the above (1), 50% by mass, and the component (C) are blended so that the neutralization equivalent ratio [(C) / ((A) + (B))] is 0.5 to 2.5. The lubricant for water-soluble metal processing as described,
(3) The water-soluble metal processing lubricant according to (1) or (2), wherein the number average molecular weight of the hydroxy fatty acid compound of (A) is 300 to 2000,
(4) The water-soluble metal processing lubricant according to any one of (1) to (3), wherein the fatty acid of (B) is a fatty acid having 8 to 10 carbon atoms,

(5) The water-soluble metal working lubricant according to any one of (1) to (4), wherein the basic compound of (C) is a mixture of an alkali metal hydroxide and an organic amine compound.
(6) The water-soluble metal working lubricant according to any one of (1) to (5), wherein the linear olefin of (D) is a 1-olefin having 8 to 20 carbon atoms,
(7) The water-soluble metalworking lubricant according to any one of (1) to (6), wherein at least one selected from a rust inhibitor, an antioxidant, and an anti-corruption agent is blended, and (8) Provided is a water-soluble metal processing lubricant obtained by diluting the water-soluble metal processing lubricant according to any one of (1) to (7) with water 3 to 300 times.

  According to the present invention, there is provided a water-soluble metal processing lubricant that has excellent processing performance in both metal processing of non-ferrous metals such as aluminum and iron metals such as iron and steel, and at the same time has good compatibility with adhesives. can do.

The water-soluble metal processing lubricant of the present invention comprises (A) a hydroxy fatty acid compound, (B) a fatty acid having 8 to 20 carbon atoms, (C) a basic compound, (D) a linear olefin, and (E) a non-ion. A surfactant is blended.
The hydroxy fatty acid compound of the component (A) in the present invention is at least one hydroxy fatty acid compound selected from hydroxy fatty acids, polycondensates of hydroxy fatty acids, and hydroxy fatty acids or polycondensates of hydroxy fatty acids and dehydration condensates of fatty acids. is there.

As the hydroxy fatty acid, for example, as monooxy fatty acid, hydroxy pelargonic acid, hydroxy capric acid, hydroxy lauric acid, hydroxy myristic acid, hydroxy palmitic acid, hydroxy stearic acid, hydroxy arachidic acid, hydroxy behenic acid, ricinoleic acid, hydroxy octadecenoic acid Monohydroxydicarboxylic acid, hydroxy sebacic acid, hydroxyoctyldecanedioic acid; monooxytricarboxylic acid, norcapellate acid, agaritic acid, dioxymonocarboxylic acid, iprolic acid, dihydroxyhexadecanoic acid, dihydroxystearic acid, dihydroxyoctadecene Acid, dihydroxyoctadecanedienic acid; as dihydroxydicarboxylic acid, dihydroxydodecanedioic acid, dihydroxyhexa Kang diacid, Furoion acid, dihydroxy hexamethylene co-diacid and the like. Also, castor oil fatty acid obtained from natural fats and oils and hardened castor oil fatty acid can be used.
Of these, monohydroxy fatty acids are preferable from the viewpoints of effects and availability, and among them, monohydroxy fatty acids having 12 to 20 carbon atoms, particularly hydroxystearic acid (12-hydroxystearic acid), and hydroxyoctadecenoic acid (ricinolein). Acid) is preferred.

  As a polycondensate of the hydroxy fatty acid, a dimer to hexamer of the hydroxy fatty acid is preferable. Particularly preferred are 2- to 6-mers of hydroxyoctadecenoic acid (ricinoleic acid) or hydroxyoctadecanoic acid (12 hydroxystearic acid).

Examples of the fatty acid used in the dehydration condensation reaction of the hydroxy fatty acid or the polycondensate of hydroxy fatty acid and a fatty acid include capric acid, undecanoic acid, undecylenic acid, dodecanoic acid, tridecanoic acid, pentadecanoic acid, heptadecanoic acid, and nonadecane. Monobasic acids exemplified by acids, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, isostearic acid, elaidic acid, oleic acid, linoleic acid, linolenic acid, sebacic acid, dodecanedioic acid, Examples thereof include dibasic acids exemplified by dodecyl succinic acid, lauryl succinic acid, stearyl succinic acid, isostearyl succinic acid, dimer acid, linoleic acid, and methacrylic acid condensate. Moreover, the fatty acid etc. which added the unsaturated fatty acid illustrated by methacrylic acid with respect to the fatty acid which has an unsaturated bond can also be used.
The polycondensate is obtained by reacting the hydroxy fatty acid or the hydroxy fatty acid polycondensate and the fatty acid according to a normal polycondensation reaction, for example, without a catalyst or in the presence of a suitable catalyst, at room temperature or under heating conditions. Can be obtained by

  The hydroxy fatty acid compound used in the present invention is preferably one having an average molecular weight of 300 to 2,000 as the hydroxy fatty acid, the polycondensate of hydroxy fatty acid, and the hydroxy fatty acid compound which is a dehydration condensate of hydroxy fatty acid or hydroxy fatty acid polycondensate and fatty acid. If the average molecular weight is less than 300, the processing performance (moldability) may be insufficient. On the other hand, if the molecular weight exceeds 2000, the adhesion may be lowered. The average molecular weight of the hydroxy fatty acid compound is more preferably 500 to 800, and particularly preferably 600 to 700.

  In the present invention, at least one hydroxy fatty acid compound selected from the hydroxy fatty acid, the polycondensate of hydroxy fatty acid, and the dehydration condensate of hydroxy fatty acid or hydroxy fatty acid polycondensate and fatty acid is blended. The compounding amount of the hydroxy fatty acid compound is preferably 10 to 60% by mass and more preferably 30 to 45% by mass based on the total amount of the lubricant. If content of a hydroxy fatty acid compound is 10 mass% or more, processing performance (moldability) will be favorable, and if it is 60 mass% or less, the appropriate compounding quantity of another component is securable.

As the fatty acid of the component (B) in the present invention, a fatty acid having 8 to 20 carbon atoms is used. The fatty acid includes a saturated or unsaturated aliphatic monocarboxylic acid and aliphatic dicarboxylic acid having a straight or branched chain.
Among these fatty acids, fatty acids having 8 to 10 carbon atoms are preferable in terms of enhancing adhesion compatibility, and specific examples thereof include aliphatic monocarboxylic acids such as various octanoic acids, various nonanoic acids, and various decanoic acids, Aliphatic dicarboxylic acids such as octanedioic acid (suberic acid), nonanedioic acid (azeleic acid), and decanedioic acid (sebacic acid) can be mentioned. Particularly, a fatty acid having 9 or 10 carbon atoms, particularly a fatty acid having 9 or 10 carbon atoms having a branched chain is preferable.
These fatty acids may be used alone or in combination of two or more.
In the present invention, the blending amount of the fatty acid is preferably 3 to 30% by mass and more preferably 5 to 15% by mass based on the total amount of the lubricant. If it is 3 mass% or more, adhesion compatibility can be kept favorable, and if it is 30 mass% or less, an appropriate blending amount of other components can be ensured.

In the present invention, as the component (C), at least one basic compound selected from alkali metal hydroxides and organic amine compounds is blended.
Examples of the alkali metal hydroxide include sodium hydroxide, potassium hydroxide, and lithium hydroxide. Examples of the organic amine compound include alkanolamine and piperazine compounds.
Examples of the alkanolamine include monoethanolamine, diethanolamine, triethanolamine, mono n-propanolamine, di (n-propanol) amine, tri (n-propanol) amine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, Examples thereof include methyl isopropanolamine. Among these alkanolamines, primary or tertiary alkanolamines having 2 to 4 carbon atoms are preferable.
In addition, typical examples of the piperazine compounds include N- (2-hydroxyalkyl) such as N- (2-hydroxymethyl) piperazine, N- (2-hydroxyethyl) piperazine, N- (2-hydroxypropyl) piperazine. An example is piperazine.
Among these organic amine compounds, triethanolamine, monoisopropanolamine, and N- (2-hydroxyalkyl) piperazine are preferable, and N- (2-hydroxyalkyl) piperazine is particularly preferable in terms of effects.

In the present invention, the blending amount of the component (C) is a neutralization equivalent ratio [(C) / ((A) + (B)) in relation to the blending amount of the component (A) and the component (B). ] Is preferably in the range of 0.5 to 2.5, and the neutralization equivalent ratio is preferably in the range of 0.6 to 2.0, particularly 0.7 to 1.7.
(C) If the compounding quantity of the at least 1 type of basic compound chosen from the alkali metal hydroxide and organic amine compound of a component is the said range, the hydroxy fatty acid compound of (A) and the fatty acid of (B) will be (C) Forms a good salt with the component, and provides excellent processing performance and adhesion compatibility, and has the effect of enhancing rust prevention. Specifically, for example, if the neutralization equivalent ratio is 0.5 or more, corrosion to iron or aluminum is suppressed, and if the neutralization equivalent ratio is 2.5 or less, good moldability can be exhibited. .

  In addition, as the component (C) of the present invention, it is preferable to mix one or more alkali metal hydroxides and one or more organic amine compounds in combination. In this case, the mixing ratio of the alkali metal hydroxide and the organic amine compound is arbitrary, but from the viewpoint of preventing discoloration of the aluminum surface, the alkali metal hydroxide (C1) and the organic amine compound (C2) The ratio (equivalent ratio (C1) / (C2)) is preferably 1.0 or less.

In the present invention, a linear olefin having 8 to 20, preferably 10 to 20 carbon atoms is used as the component (D). If the straight-chain olefin has less than 8 carbon atoms, the flash point is low, which is not preferable. On the other hand, if the carbon number exceeds 20, it is usually solid at room temperature, and is difficult to handle. In the present invention, among these linear olefins, α-olefins, that is, 1-olefins are preferable.
Specific examples of such linear olefins include 1-octene, 1-decene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-icocene or a mixture thereof.
As these linear olefins, for example, ethylene oligomers produced by polymerizing ethylene can be used.
In this invention, it is preferable that the compounding quantity of the said C8-C20 linear olefin is 0.5-30 mass% on the basis of lubricant whole quantity, and it is 0.5-15 mass%. More preferred. If it is 0.5% by mass or more, the processing performance, particularly the processing performance for non-ferrous metals can be kept good. On the other hand, if it is 30% by mass or less, the degreasing property is good, and other components are appropriate Can be ensured.

In the present invention, a nonionic surfactant is blended as the component (E).
Various types of nonionic surfactants can be used. For example, polyoxyalkylene glycol or its mono-, diether compound, glycerin or its alkylene oxide adduct or polyoxyalkylene emulsifier such as ether compound, ester of carboxylic acid and alcohol (especially polyhydric alcohol), alkanolamine and fatty acid Alternatively, an amide with a carboxylic acid, an alkylene oxide adduct of an alkylamine, and the like can be given. Of these, polyoxyethylene alkyl ethers and esters of carboxylic acids and polyhydric alcohols are preferred, and those having HLB 4 or higher are particularly preferred.
The compounding amount of the nonionic surfactant is preferably 3 to 50% by mass, more preferably 5 to 35% by mass based on the total amount of the lubricant. If it is 3 mass% or more, the dispersibility or solubility of a lubricant is favorable, and on the other hand, if it is 50 mass% or less, an appropriate blending amount of other components can be ensured.
In the present invention, in addition to the nonionic surfactant, an anionic surfactant such as sulfate ester salt, sulfonate ester salt and phosphate ester salt, and a cationic surfactant such as polyethylene polyamine are blended. May be.

In the present invention, water may be further blended. This water may have an effect of improving the dispersion or dissolution stability of the lubricant.
However, the dispersion (dissolution) stability of the lubricant varies depending on the contents of the components (A) to (E) present in the lubricant and the blending ratio thereof. Therefore, water may not be required. Therefore, the amount of water is preferably 0 to 50% by mass, more preferably 0 to 10% by mass based on the total amount of the lubricant.

In the water-soluble metal processing lubricant of the present invention, it is preferable to further blend at least one selected from a rust inhibitor, an antioxidant and an anti-corrosion agent.
Examples of the rust inhibitor include metal sulfonates such as sodium petroleum sulfonate, succinic acid esters such as lauryl succinic acid, stearyl succinic acid, and isostearyl succinic acid, and carboxylic acid amides. The blending amount of such a rust preventive agent is usually preferably blended within a range of 0.0005 to 2 mass%, more preferably 0.001 to 1 mass%, based on the total amount of the lubricant.
Examples of the antioxidant include phenolic antioxidants such as 2,6-di-tert-butyl-4-methylphenol and 4,4′-methylenebis (2,6-di-tert-butylphenol). , 4′-dioctyldiphenylamine, 4,4′-dinonyldiphenylamine, and amine-based antioxidants such as phenyl-α-naphthylamine.
The blending amount of such an antioxidant is preferably blended within the range of 0.01 to 3% by mass, more preferably 0.05 to 2% by mass, based on the total amount of the lubricant.
Examples of the antiseptic agent include triazine preservatives and alkylbenzimidazole preservatives. The blending amount of such an anti-corruption agent is usually preferably within a range of 0.0001 to 3% by mass, and more preferably 0.001 to 2% by mass, based on the total amount of the lubricant.

In the water-soluble metal processing lubricant of the present invention, other additives and solvents can be appropriately blended within a range not departing from the object of the present invention.
Examples of such additives include various alcohols, esters, fats and oils, sulfurized fats and oils, sulfurized esters, sulfurized olefins, sulfide mineral oil, chlorinated paraffin, phosphate esters, phosphite esters, and their Oiling agents such as amine salts, dithiophosphates (such as zinc dithiophosphate and molybdenum dithiophosphate), dithiocarbamates (such as molybdenum dithiocarbamate), extreme pressure agents, corrosion inhibitors such as benzotriazoles and thiazoles, silicones, Examples thereof include antifoaming agents such as fluorinated silicon and viscosity index improvers such as polymethacrylate and olefin copolymer.
The blending amount of these additives may be appropriately selected according to the purpose, but is usually blended so that the total of these additives is 20% by mass or less based on the total amount of the lubricant.

The present invention is a water-soluble metal processing lubricant comprising the above-mentioned components, and the lubricant is used as a stock solution, which is diluted with water and used as a water-soluble metal processing lubricant. can do. In this case, the dilution rate is not particularly limited, but is usually preferably 3 to 300 times, preferably 5 to 100 times, and more preferably about 10 to 50 times.
Moreover, about the pH of the water-soluble metal processing lubricant, the 30-fold diluted solution of water is preferably 7.5 to 10, and more preferably 8 to 9.5. If the 30 times dilution of water is within this range, there is no fear of discoloration or corrosion of various metal surfaces.

Although there is no restriction | limiting in particular about the kinematic viscosity of the lubricant for water-soluble metalworking (including the diluted lubricant) of this invention, What is in the range of about 20-20000 mm < ² > / s at 40 degreeC is preferable. If the kinematic viscosity is in the range of about 20 to 20000 mm ² / s, the workability is good, there is no problem of flammability, and the amount of the lubricant attached to the work piece is not excessive. .

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by this example.
In addition, about the sample oil obtained by each Example and the comparative example, it evaluated with the following method.
1. Formability (ball head overhang molding test)
<Evaluation method>
Press working was performed by the following method, and a ball head overhang forming test was conducted.
(1) Work material (a) Steel material (JSC270D), GA material (galvanized steel sheet, JAC270D), both 0.8mm thick
(B) Aluminum material (AA5182 and AA6022), both plate thickness 1.0mm
(2) Processing conditions Punch ball head diameter: φ100, chrome-plated steel Molding speed: 100 mm / s
(3) Evaluation item The ball head overhang forming crack occurrence limit height (mm) was measured.
<Evaluation criteria>
◎: Limit height, 36 mm or more for aluminum and GA, 40 mm or more for steel ○: Limit height, 30 to 36 mm for aluminum and GA, 35 mm to less than 40 mm for steel ×: Limit height Well, less than 30mm for aluminum and GA, less than 35mm for steel

2. Adhesion compatibility test
<Evaluation method>
In accordance with JASO standard M323, the shear strength and peel mode (peel area ratio) were measured for two workpieces bonded by the following method.
(1) Workpiece adhesion method;
1. Test pieces (25 × 100 mm rectangles) used in the evaluation of formability in (1) were prepared in sets of two each. About these test pieces, the lubricant was apply | coated so that it might become the application quantity of 1 g / m < ² > on the single side | surface. Next, with respect to one test piece of each two-sheet set to which the lubricant was applied, an adhesive was applied to the lubricant application surface, and the adhesive-coated test piece and the other set of two pieces of the lubricant were lubricated. A test piece set was prepared by adhering the adhesive through the agent application surface.
In this case, the application amount of the adhesive was adjusted using a spacer or glass beads so that the gap between the test pieces at the bonded portion was 0.05 to 0.15 mm.
The test piece set was heated in a drying oven at 170 ± 2 ° C. for 20 minutes, and then allowed to stand in a standard state for 24 hours. The test piece set thus obtained was evaluated for shear strength and peel form.
As the adhesive, an epoxy adhesive (manufactured by Sunstar Giken Co., Ltd., trade name “# 1085”) was used.
(2) Shear strength measurement conditions The tensile rate during shear strength measurement was measured under the condition of 50 mm / min.
<Evaluation criteria>
Shear strength ◎: 15 MPa or more ○: 10 MPa or more and less than 15 MPa ×: less than 10 MPa
Peeling form ;
○: Cohesive fracture area ratio 100%
Δ: Cohesive fracture area ratio of 80% or more and less than 100% ×: Cohesive fracture area ratio of less than 80%

3. Degreasing test
<Evaluation method>
An aluminum plate (AA5182, 70 × 150 mm) coated with 3.0 g / m ^{2 of} lubricant was left at room temperature for 1 hour and then washed with water. The area% of the degreased portion was determined by washing with water.
<Evaluation criteria>
○: 95% or more Δ: 50% or more and less than 95% ×: less than 50% Rust prevention test
<Evaluation method>
An aluminum plate (AA5182, 70 × 150 mm) coated with 3.0 g / m ^{2 of} lubricant was exposed at room temperature for 14 days, and then the appearance of the aluminum plate was observed and evaluated.
<Evaluation criteria>
○: No discoloration △: Discoloration (discolored area is 5% or less)
×: Discolored (discolored area exceeds 5%)
5. Low temperature storage stability test Each oil agent was installed in a low temperature bath at -5 ° C, and the presence or absence of cloudiness was observed after 5 days.
<Evaluation criteria>
○: No cloudiness △: Slightly cloudy, return to transparent liquid at room temperature ×: Cloudy and solids generated, not return to transparent liquid at room temperature

Examples 1-14, Comparative Examples 1-7
Oils having the compositions shown in Tables 1 and 2 were prepared, and the performance of the lubricants is shown in Tables 1 and 2.

[note]
1) A compound of Mn = 300 is ricinoleic acid alone, each compound of Mn = 650-1650 is polycondensed with ricinoleic acid, and the polycondensate is further reacted with lauric acid (dehydration condensation) to obtain a dehydration condensate ,
2) Mixture of 50% by weight aqueous solution of potassium hydroxide (purity: 80%) and N- (2-hydroxyethyl) piperazine 3) Mixture of 1-olefin having 10 to 18 carbon atoms 4) Hexylene diglycol (HLB = 4)
5) Rust preventive (benzotriazole)

According to Tables 1 and 2, if the lubricants of Examples 1 to 14 according to the present invention are used, any of various steel materials (steel, galvanized steel, etc.) and various aluminum materials can be processed. It can be seen that the moldability is excellent and the adhesive compatibility is good for both steel and aluminum.
On the other hand, Comparative Examples 1 to 3 containing no B component, Comparative Example 4 containing no A component, Comparative Example 5 containing no D component, Comparative Example 6 containing no E component, and Comparative Example 7 containing no C component This lubricant cannot satisfy all the properties of formability in processing of steel and aluminum materials, and adhesion compatibility to steel and aluminum materials.

The lubricant for water-soluble metal processing of the present invention is effective for various metal processing such as press processing, and is particularly excellent in processing performance in any metal processing of non-ferrous metals such as aluminum and iron metals such as iron and steel. ing. In addition, it is a water-soluble metal processing lubricant with excellent adhesive compatibility.
Therefore, it can be effectively used as a lubricant for metal processing for processing various workpieces such as automobile parts manufacturing.

Claims (8)

  (A) hydroxy fatty acid, polycondensate of hydroxy fatty acid, and at least one hydroxy fatty acid compound selected from hydroxy fatty acid or polycondensate of hydroxy fatty acid and dehydration condensate of fatty acid, (B) fatty acid having 8 to 20 carbon atoms, (C) At least one basic compound selected from alkali metal hydroxides and organic amine compounds, (D) a linear olefin having 8 to 20 carbon atoms, and (E) a nonionic surfactant. Water-soluble metal processing lubricant.   Component (A) is 10 to 60% by mass, component (B) is 3 to 30% by mass, component (D) is 0.5 to 30% by mass, and component (E) is 3 to 50% by mass based on the total amount of lubricant. The water-soluble composition according to claim 1, wherein the neutralization equivalent ratio [(C) / ((A) + (B))] is in the range of 0.5 to 2.5. Lubricant for metal processing.   The number average molecular weight of the hydroxy fatty acid compound of (A) is 300-2000, The water-soluble metal processing lubricant according to claim 1 or 2.   The water-soluble metal processing lubricant according to any one of claims 1 to 3, wherein the fatty acid (B) is a fatty acid having 8 to 10 carbon atoms.   The water-soluble metal processing lubricant according to any one of claims 1 to 4, wherein the basic compound (C) is a mixture of an alkali metal hydroxide and an organic amine compound.   6. The water-soluble metal processing lubricant according to claim 1, wherein the linear olefin of (D) is a 1-olefin having 8 to 20 carbon atoms.   The water-soluble metal-working lubricant according to any one of claims 1 to 6, comprising at least one selected from a rust inhibitor, an antioxidant and an anti-corruption agent.   A water-soluble metal processing lubricant obtained by diluting the water-soluble metal processing lubricant according to claim 1 with water 3 to 300 times.