JP2000256695A - Water soluble lubricant for metal working - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricant for metal working which exhibits excellent working properties and is less prone to adversely influence the environment. SOLUTION: A lubricant for metal working contains (A) at least one selected from the group consisting of dehydration condensates of hydroxy fatty acids and fatty acids and dehydration condensates of hydroxy fatty acids polycondensates and fatty acids, (B) at least one selected from the group consisting of hydroxy fatty acids polycondensates and castor oil derivatives and at least one selected from the group consisting of (C) polyol esters and (D) dibasic esters. The lubricant preferably contains 2.5-50 wt.% of component (A), 2-30 wt.% of component (B) and 5-50 wt.% of component (C).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-soluble metal working fluid which can be widely applied to metal working such as cutting, grinding, rolling, pressing, and plastic working, and more particularly to improvement of cutting performance and grinding performance. The present invention relates to a water-soluble metalworking oil which exhibits excellent effects.

[0002]

2. Description of the Related Art Metal working oils widely used in the cutting and grinding fields include mineral oil-based water-insoluble oils, mineral oils, surfactants, organic amines and the like. Some water-soluble oils are used after dilution. It is generally considered necessary to add a compound called an extreme pressure additive to these oils in order to improve the cutting performance and the grinding performance of the oil. Oils containing such extreme pressure additives are specially classified according to Japanese Industrial Standards (see JIS K 2241 Cutting Oils) (water-insoluble oils 2 types 1 to 6 and 11 to 16; Oils W2).
On the other hand, from the viewpoint of saving global resources and preventing deterioration of the global environment in recent years, there has been a demand for the development of metal working oils that are more environmentally friendly than conventional ones, and that furthermore can be used for as long as possible. . From this viewpoint, as a result of reviewing the main components (raw materials) used in metalworking fluids, it was found that extreme pressure additives that exert effects on cutting performance, grinding performance, etc. had the following problems. .

[0003] Representative compounds of extreme pressure additives include chlorine compounds, sulfur compounds and phosphorus compounds.
Metal working oils generate waste oil after use. When the waste oil containing the chlorine-based compound is subjected to, for example, a combustion treatment, chlorine gas, hydrogen chloride gas, and the like are generated, which leads to damage to the incinerator and shortened life of the incinerator. It is also known that dioxin is generated when some chlorine-based extreme pressure additive-containing waste oil is subjected to combustion treatment.

[0004] Oils containing sulfur compounds, like oils containing chlorine compounds, are used for a long period of time, and when they are discarded, for example, subjected to combustion treatment, SOX gas is generated and the life of the incinerator is reduced. In addition to reduction, it causes air pollution.
Further, when a water-soluble cutting oil containing these sulfur compounds is used as a coolant, the sulfur compounds serve as a nutrient source for bacteria living in the coolant, promote the growth of bacteria, and further reduce the compounds themselves by microbial reduction, thereby reducing hydrogen sulfide. Causes the deterioration of the coolant, shortens the life of the coolant, and increases the amount of waste liquid to be discarded.
This is very problematic in saving resources.

Further, when a water-soluble cutting oil containing a phosphorus compound is used as a coolant, it becomes a nutrient source for bacteria living in the coolant, as in the case of an oil containing a sulfur compound, and promotes the abnormal occurrence of bacteria, and Corrosion occurs, and the coolant must be discarded in a short period of time, which is a problem in waste liquid treatment.

Conventionally, as a water-soluble metal working oil which does not contain extreme pressure additives such as chlorine compounds, for example, a water-soluble cutting oil using a salt of polyhydroxy fatty acid (JP-A-60-1985)
No. 88096), a water-soluble cutting and grinding oil using a salt of a polycondensate of ricinoleic acid (Japanese Patent Publication No. 2-5795), and a salt of a condensed fatty acid obtained by dehydrating and condensing a dihydroxy fatty acid and / or a monohydroxy fatty acid. Water-soluble cutting oil (JP-A-4-202298), obtained by reacting a hydroxy fatty acid or a condensed hydroxy fatty acid obtained by dehydrating and condensing a hydroxy fatty acid with an aliphatic carboxylic acid, an alicyclic fatty acid or an aromatic fatty acid. A water-soluble processing oil using an alkali metal salt, an ammonium salt or an amine salt of an esterified product (JP-A-7-286192)
), (A) mono- and / or dihydroxy fatty acids having 18 carbon atoms, (B) divalent to hexavalent polyol, and (C) aliphatic dibasic acids having 4 to 36 carbon atoms. Condensate, esterified product of A and B and polycondensate of A, A and C
And water-soluble cutting and grinding oils (JP-A-7-97590) using an alkali metal salt or an amine salt of any of the polycondensates of A and B, and the polycondensates of A and B with A and C. ing. However, these conventionally known water-soluble metal working oils do not provide a sufficient effect particularly in heavy cutting and heavy grinding as compared with water-soluble metal working oils containing a chlorine-based additive.

[0007]

SUMMARY OF THE INVENTION The present invention focuses on the above-mentioned problems, and shows excellent machining performance when used as a metalworking oil, including cutting and grinding, and is environmentally friendly. An object of the present invention is to provide a metalworking oil agent that is less likely to have a bad influence.

[0008]

Means for Solving the Problems As a result of intensive studies, the present inventor has found that, as an alternative to these extreme pressure additives, a specific polycondensed carboxylic acid and a specific ester are contained, thereby obtaining a chlorine-based extreme pressure additive. The present inventors have found that a water-soluble metalworking oil having an effect equal to or higher than that of a cutting oil containing the same can be obtained, and have completed the present invention. The present invention is a water-soluble metalworking oil containing the following components. (A) at least one selected from the group consisting of a dehydration condensate of a hydroxy fatty acid and a fatty acid and a dehydration condensate of a hydroxy fatty acid polycondensate and a fatty acid, and (B) at least one selected from the group consisting of a hydroxy fatty acid polycondensate and a castor oil derivative. And at least one selected from the group consisting of (C) a polyol ester and (D) a dibasic acid ester.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The water-soluble metalworking oil according to the present invention comprises, as component (A), at least one selected from the group consisting of a dehydration condensate of a hydroxy fatty acid and a fatty acid and a dehydration condensate of a hydroxy fatty acid polycondensate and a fatty acid. Contains one.

As the hydroxy fatty acid monomer,
For example, in aliphatic oxy fatty acids, as monooxy fatty acids, hydroxyperargonic acid, hydroxycapric acid,
Hydroxylauric acid, hydroxymyristic acid, hydroxypalmitic acid, hydroxystearic acid, hydroxyarachinic acid, hydroxybehenic acid, ricinoleic acid, hydroxyoctadecenoic acid; monooxydicarboxylic acids such as hydroxysebacic acid, hydroxyoctyldecane diacid; As tricarboxylic acids, norcaperate acid, agaritic acid; As dioxymonocarboxylic acids, iprolic acid, dihydroxyhexadecanoic acid, dihydroxystearic acid, dihydroxyoctadecenoic acid, dihydroxyoctadecanedienoic acid; as dihydroxydicarboxylic acids, dihydroxydodecanedioic acid, dihydroxyhexadecane Examples thereof include diacid , fluoric acid, and dihydroxyhexacodioic acid.

[0011] Castor oil fatty acids and hardened castor oil fatty acids collected from natural fats and oils are also included. Of these hydroxy fatty acids, monohydroxy fatty acids are preferred, and the polycondensates are preferably dimer to hexamer. Particularly preferred is a dimer to hexamer of hydroxyoctadecenoic acid (ricinoleic acid) or hydroxyoctadecanoic acid (12-hydroxystearic acid).

The fatty acid to be dehydrated and condensed with the above-mentioned hydroxy fatty acid or hydroxy fatty acid polycondensate includes capric acid, undecanoic acid, undecylenic acid, dodecanoic acid, tridecanoic acid, pentadecanoic acid, heptadecanoic acid, and the like.
Monobasic acids such as nonadecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachiic acid, behenic acid, isostearic acid, elaidic acid, oleic acid, linoleic acid, linoleic acid, sebacic acid, dodecane diacid And dibasic acids such as dodecyl succinic acid, lauryl succinic acid, stearyl succinic acid, isostearyl succinic acid, dimer acid, and linoleic acid methacrylic acid condensate (trade name: Harima Chemicals, DA-1550). . Further, a fatty acid obtained by adding an unsaturated fatty acid represented by methacrylic acid to a fatty acid having an unsaturated bond may be used.

[0013] The fatty acid to be a dehydration-condensation partner is preferably a dibasic acid, and particularly preferably has 10 to 4 carbon atoms.
4 are more preferable, and in particular, those having 16 carbon atoms
To 36 are preferred.

The polycondensate is prepared by subjecting the hydroxy fatty acid or the hydroxy fatty acid polycondensate to the above fatty acid according to a usual polycondensation reaction, for example, in the absence of a catalyst or in the presence of a suitable catalyst, at room temperature or under heating conditions. It is obtained by reacting. The by-product water and alcohol are appropriately drained out of the system. The end of the reaction is determined when the hydroxyl value has almost disappeared. The method for producing the polycondensate is not limited to the above method.

The water-soluble metalworking oil of the present invention comprises the component (B)
Contains polycondensates of hydroxy fatty acids and / or castor oil derivatives. The constituent monomers of the hydroxy fatty acid polycondensate include hydroxylauric acid, hydroxymyristic acid, hydroxypalmitic acid, hydroxystearic acid, hydroxyarachinic acid, hydroxybehenic acid, ricinoleic acid, hydroxyoctadecenoic acid, hydroxyoctyldecane diacid, norcaperate Acids, agaritic acid, iprolic acid, dihydroxyhexadecanoic acid, dihydroxystearic acid, dihydroxyoctadecenoic acid, dihydroxyoctadecanedienoic acid, dihydroxydodecanedioic acid, dihydroxyhexadecanoic acid, floionic acid, dihydroxyhexacodioic acid, castor oil fatty acids, hardened castor oil fatty acids And so on.

The hydroxy fatty acid polycondensate of the component (B) of the present invention is obtained by subjecting at least one of the above-mentioned hydroxy fatty acids to a polycondensation reaction, and comprises at least one carboxylic acid group in the molecule and at least one carboxylic acid group. It has one hydroxyl group. The polycondensate of the hydroxy fatty acid can be obtained by a general polycondensation reaction, for example, by reacting at room temperature or under heating conditions without a catalyst or in the presence of a suitable catalyst. By-product water and alcohol
Discharge appropriately out of the system. The degree of polycondensation can be determined by measuring the acid value, hydroxyl value, viscosity, or amount of by-produced water or alcohol of the reactant.

At the time of the reaction, a solvent may or may not be used, and it is preferable to remove azeotropically water, alcohol and the like from the system under reflux conditions such as xylene. Alternatively, a halide type product may be used as a part of the higher fatty acid and reacted in a solvent such as chloroform. In this case, the reaction temperature is sufficient at a low temperature of about room temperature.
The method for producing the polycondensate is not limited to the above method.

Preferred among the polycondensates of the hydroxy fatty acids of component (B) mentioned above are castor oil fatty acid polycondensates and hardened castor oil fatty acid polycondensates. preferable. Also, component (B)
Examples of castor oil derivatives include castor oil polycondensates, castor oil alkylene oxide adducts, such as castor oil ethylene oxide adducts, castor oil propylene oxide adducts, and the like, and those obtained by adding 1 to 20 mol of ethylene oxide to castor oil. Is preferred.

The above polycondensate of castor oil can be produced by a general polycondensation reaction, for example, by reacting in the absence of a catalyst or in the presence of a suitable catalyst at room temperature or under heating conditions. The addition of ethylene oxide and propylene oxide can be achieved by blowing ethylene oxide and propylene oxide into castor oil under heating and pressurizing conditions.

The water-soluble metalworking oil of the present invention comprises the component (C)
At least one of the polyol ester of component (A) and the dibasic acid ester of component (D). The fatty acid used as the raw material of the polyol ester of the component (C) includes 6 to 3 carbon atoms.
Six fatty acids are preferred, and fatty acids having 6 to 22 carbon atoms are more preferred. Particularly preferred are those having 18 carbon atoms.
Is a linear or branched fatty acid.

Specific examples of the fatty acid component of the polyol ester of the component (C) include caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, undecanoic acid, undecylenic acid, dodecanoic acid, tridecanoic acid, pentadecanoic acid, and heptadecane. Acid, nonadecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachiic acid,
Behenic acid, isostearic acid, elaidic acid, oleic acid, linoleic acid, linoleic acid, hydroxylauric acid, hydroxymyristic acid, hydroxypalmitic acid, hydroxystearic acid, hydroxyarachinic acid,
Hydroxybehenic acid, ricinoleic acid, hydroxyoctadecenoic acid, and the like.

Specific examples of the polyol component of the polyol ester of the component (C) include ethylene glycol, diethylene glycol, polyethylene glycol, glycerin, trimethylolpropane, pentaerythritol,
Examples include dipentaerythritol and triethanolamine. Examples of polyol esters include ethylene glycol diester, diethylene glycol diester, polyethylene glycol diester, triglyceride, trimethylolpropane triester, pentaerythritol tetraester, dipentaerythritol tetraester, and triethanolamine triester. Also, natural fats and oils, hardened castor oil,
Castor oil is also available.

The dibasic acid component of the dibasic acid ester of component (D) preferably has 10 to 44 carbon atoms, more preferably 16 to 36 carbon atoms. Specific examples include sebacic acid, dodecandioic acid, dodecyl succinic acid, lauryl succinic acid, stearyl succinic acid, isostearyl succinic acid, dimer acid and the like.

The alcohol component of the dibasic acid ester of the component (D) is preferably a saturated or unsaturated, straight-chain or branched-chain alcohol having 8 to 22 carbon atoms. In consideration of the stability of the stock solution, a branched alcohol or an unsaturated linear alcohol is more preferable. Specifically, octyl alcohol, nonyl alcohol, decyl alcohol, lauryl alcohol, myristyl alcohol, stearyl alcohol, oleyl alcohol,
-Ethylhexyl alcohol, isostearyl alcohol and the like.

Esters of dibasic acids and alcohols can be used, for example, in the absence of any catalyst or in the presence of a suitable catalyst.
It can be produced by reacting at room temperature or under heating conditions. The by-produced water is appropriately discharged out of the system. The degree of progress of the ester synthesis reaction can be determined by measuring the acid value, hydroxyl value, or amount of by-produced water of the reactant. Usually, the reaction is terminated when the acid value and hydroxyl value have almost disappeared. At the time of the reaction, a solvent may or may not be used. Preferably, water is azeotropically removed under reflux conditions such as xylene to remove the solvent out of the system. The method for synthesizing the dibasic acid ester is not limited to the above method.

The water-soluble metalworking oil of the present invention comprises the above components
It is preferable that (A), (B), and (C) and / or (D) are contained in a specific ratio, and the ratio is (A): 2.5 to 5
0% by weight, (B): 2 to 30% by weight, (C): 5 to 50% by weight, and (D): 2 to 20% by weight are preferable. Component (A) is 2.5
Less than 2% by weight of component (B), less than 5% by weight of component (C) or component (D)
Is less than 2% by weight, the expected lubricating performance may not be obtained.

When the amount of the component (A) exceeds 50% by weight, secondary performance may be deteriorated. Specifically, when a stock solution of a water-soluble metal working oil is diluted, the diluted solution is likely to foam. When the content of the component (B) exceeds 30% by weight, the content of the component (C) exceeds 50% by weight or the content of the component (D) exceeds 20% by weight, It becomes difficult to dilute the undiluted oil solution into water, and the phenomenon that the compound used in the present invention floats easily occurs.

Accordingly, the water-soluble metalworking oil of the present invention comprises
More preferably, component (A) is 2.5 to 30% by weight, component (B) is 5 to 15% by weight, component (C) is 10 to 40% by weight,
Alternatively, the content of the component (D) is preferably 2 to 10% by weight. Further, each of the components (A), (B), (C), and (D) may be a single component or a mixture of two or more types.

[0029]

[Action] The components (A) and (B) of the water-soluble metalworking oil of the present invention,
(C) and (D) each have a molecular weight of about 1000 to about 2000.
These are compounds having an ester bond in the molecule, and are considered to have excellent adsorption properties to the lubricating surface. In fact, when applied to metalworking, for example, in cutting, it exerts excellent lubrication at the interface between the cutting tool and the workpiece, penetrates into the lubricated parts, prolongs the life of the cutting tool, and improves machinability. Let it. In addition, component (A),
Since the ester bonds of (B), (C) and (D) are located in the middle of the molecule, they have excellent hydrolysis resistance even in an alkaline atmosphere. Therefore, even when used as a water-soluble cutting oil having a pH of about 9 to 11, it can be used stably without hydrolysis.

The water-soluble metalworking oil of the present invention may contain monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine,
Alicyclics such as alkanolamines such as -amino-2-methylethanolamine, inorganic alkalis such as KOH and NaOH, cyclohexylamine, dicyclohexylamine, 1,3-bisaminomethylcyclohexane, metaxylenediamine and morpholine; Formula amines or aromatic amines, alkylamines typified by laurylamine, oleylamine and the like and oxyethylene adducts thereof may be contained as a preservative or a fungus inhibitor. The appropriate amount of these additives is 5 to 10% by weight based on the total weight of the oil agent.

Further, the water-soluble metalworking oil agent of the present invention includes:
Pelargonic acid, caprylic acid, lauric acid,
Oleic acid, ricinoleic acid, erucic acid, sebacic acid,
Fatty acids such as azelaic acid, dodecanedioic acid, lauryl succinic acid, stearyl succinic acid, isostearyl succinic acid, sulfonates such as sodium petroleum sulfonate,
A carboxylic acid amide or the like may be contained as a rust preventive. The amount of these additives is 5 to 5% of the total weight of the oil agent.
30% by weight is suitable.

Further, the water-soluble metalworking oil of the present invention may contain a silicone-based antifoaming agent, an alcohol-based antifoaming agent, a triazine-based metal preservative, a benzothiazole-based metal anticorrosive, and the like, if necessary. good. The amount of these additives
0.05 to 5% by weight based on the total weight of the oil agent is appropriate. The water-soluble metal working oil agent of the present invention comprises the components (A), (B),
It can be easily produced by blending (C) and (D) in specified amounts.

In order to further improve the cutting and grinding properties, base oils such as mineral oil and synthetic oil, oily agents such as esters, animal and vegetable oils and fats, higher alcohols and the like, and organic metal salts (molybdates, phosphates, etc.) Friction modifiers, and in some cases, extreme pressure additives such as chlorine compounds, sulfur compounds, and phosphorus compounds, and various types of polyoxyalkylene glycols can be added. However, it is preferable not to contain extreme pressure additives such as chlorine compounds, sulfur compounds and phosphorus compounds.

[0034]

Examples and Comparative Examples Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. Ingredients used in the present invention
Table 1 shows the contents of (A), (B), (C), and (D) and the symbols used in the following Examples and Comparative Examples. Water-soluble metalworking oils having the compositions shown in Tables 2 and 3 were prepared. The following experiments were conducted for these oil agents, and their performances were evaluated. Table 2 shows the composition of the emulsion type water-soluble metal working oil, and Table 3 shows the composition of the soluble type water-soluble metal working oil. The unit of the numerical value related to the composition in each table is% by weight.

Preparation of Sample Water-soluble metalworking oil (stock solution) having the composition shown in Tables 2 and 3
Was diluted with tap water to prepare a 10% by weight aqueous solution to obtain a sample. Hard Water Dilution Stability Test Prepared hard water (water of 0.757 g of calcium chloride dihydrate diluted to 1 L with distilled water: German hardness: 30 °, Ca hardness: 540 ppm, JIS K 2221 Cutting oil: Refer to emulsification stability test) , Water-soluble metalworking oil (stock solution)
A 2% by weight dilution is prepared, and the state immediately after dilution and after 24 hours is checked. Judgment ○: Passed Transparent or cloudy, with no cream layer or oil layer. X: rejection Separation such as cream layer and oil layer is recognized.

Machinability test The water-soluble metalworking oil (stock solution) containing the composition was tested for 10
200 L of the weight% diluent is placed in a coolant tank of a machining center, and a cutting experiment is performed under the following cutting conditions in the same manner as in the actual case, and a tapping torque and a wear state of a tool are examined. The quality of the oil is determined based on the wear state of the tool at that time.

Cutting specifications Machine tool: Machining center MV-40A (Mori Seiki Seisakusho) Cutting tool: Point tap M10 × 1.5 Workpiece: SCM-440 Grinding conditions Cutting speed: 7.8 m / min Feeding speed: 375 mm / min Rotational feed: 1.5 mm / rev Rotation speed: 250 rpm Prepared hole: φ8.5 mm Cutting length: t = 30 mm (penetration) n number: 100 Evaluation: Tool appearance and torque value of less than 1400 N · cm were judged as acceptable ((), and 1400 N · cm or more was judged as unacceptable (×).

Skin Abrasion A drop of a solution obtained by diluting a water-soluble metal working oil (stock solution) two-fold is dropped into a patch test unit (fintest chamber manufactured by epitest), and the tape is attached to the upper arm with tape.
The state of the skin after 4 hours is observed. It is determined according to the following criteria. Judgment criteria 3 points: redness with blisters and papules 2 points: redness and swelling 1 point: slightly redness 0.5 points: suspicious 0 points: no response The judgment results of the subjects (10 boys) are totaled. The lower the score, the less irritation to the skin and the less rough the skin. A score of less than 5 is passed (o) and a score of 5 or more is rejected (x).

From the results of Examples and Comparative Examples in Tables 2 and 3, Examples 1 to 14 of the water-soluble metal working oils (stock solutions) containing the components of the present invention sufficiently contribute to the improvement of the machinability. You can see that. In addition, the rough skin shows good results. Furthermore, the water-soluble metalworking oil of the present invention has excellent stability (hard water resistance) even when diluted with hard water, and has excellent lubricity. Therefore, it is possible to sufficiently contribute to the improvement of the cutting property and the grinding property.

[0040]

The water-soluble metal working oil of the present invention is specified as a substitute for a chlorine-based extreme pressure additive, a sulfur-based extreme pressure additive, a phosphorus-based extreme pressure additive, etc. contained in conventional metal working oils. By containing a polycondensed carboxylic acid and a specific ester, cutting and grinding equivalent to or higher than metal working fluids containing chlorine-based extreme pressure additives, sulfur-based extreme pressure additives, phosphorus-based extreme pressure additives, etc. Has performance. Therefore, this water-soluble metal working oil is extremely useful in metal working such as cutting and grinding.

[0041]

[Table 1]

[0042]

[Table 2] Emulsion (-) Indicates that a stock solution could not be produced.

[0043]

[Table 3] Soluble (-) Indicates that a stock solution could not be produced.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Kazuyoshi Takeda 1-4-1 Tsujido Shindai, Fujisawa-shi, Kanagawa F-term (reference) 4H104 AA01R BB15R BB16R BB19R BB31C BB33A BB34A BB47C BE04A CB13C CB14C DA06 LA06 PA21 QA01

Claims (19)

[Claims] 1. A water-soluble metalworking oil containing the following components: (A) at least one selected from the group consisting of a dehydration condensate of a hydroxy fatty acid and a fatty acid and a dehydration condensate of a hydroxy fatty acid polycondensate and a fatty acid, and (B) at least one selected from the group consisting of a hydroxy fatty acid polycondensate and a castor oil derivative. And at least one selected from the group consisting of (C) a polyol ester and (D) a dibasic acid ester. 2. Component (A) is 2.5 to 50% by weight, component (B)
2. The water-soluble metalworking oil according to claim 1, which contains 2 to 30% by weight of the component (C) and 5 to 50% by weight of the component (C). 3. Component (A): 2.5 to 50% by weight, component (B)
2. The water-soluble metalworking oil according to claim 1, which comprises 2 to 30% by weight of the component (D) and 2 to 20% by weight of the component (D). 4. The water-soluble metalworking oil according to claim 1, wherein the fatty acid of the component (A) is a dibasic acid. 5. The fatty acid of component (A) has 10 carbon atoms.
The water-soluble metalworking oil according to claim 4, which is a dibasic acid of -44. 6. The water-soluble metalworking oil according to any one of claims 1 to 5, wherein the hydroxy fatty acid and / or the polycondensate of the hydroxy fatty acid of the component (A) is a monohydroxy fatty acid or a polycondensate thereof. 7. The method according to claim 1, wherein the hydroxy fatty acid and / or hydroxy fatty acid polycondensate of the component (A) is hydroxyoctadecanoic acid or a dimer to hexamer of hydroxyoctadecenoic acid. Water-soluble metalworking oil. 8. The polycondensate of hydroxy fatty acid of component (B) is a polycondensate of monohydroxy fatty acid.
The water-soluble metalworking oil agent according to any one of the above items. 9. The water-soluble metal according to claim 1, wherein the hydroxy fatty acid polycondensate of the component (B) is hydroxyoctadecanoic acid and / or a dimer to hexamer of hydroxyoctadecenoic acid. Processing oil agent. 10. The water-soluble metalworking oil according to claim 1, wherein the castor oil derivative of the component (B) is a castor oil alkylene oxide adduct. 11. The water-soluble metalworking oil according to claim 10, wherein the castor oil derivative of the component (B) is a castor oil ethylene oxide adduct. 12. The water-soluble metalworking oil according to claim 11, wherein the ethylene oxide addition mole of the castor oil ethylene oxide adduct of the component (B) is 1 to 20 mol. 13. The polyol ester of the component (C) is ethylene glycol diester, diethylene glycol diester, polyethylene glycol diester, triglyceride, trimethylolpropane triester, pentaerythritol tetraester, dipentaerythritol tetraester, and triethanolamine triester. The water-soluble metalworking oil according to any one of claims 1 to 12, which is at least one member selected from the group consisting of: 14. The water-soluble metalworking oil according to claim 1, wherein the fatty acid used as a raw material of the polyol ester of the component (C) is a fatty acid having 6 to 36 carbon atoms. 15. The water-soluble metalworking oil according to claim 14, wherein the fatty acid used as a raw material for the polyol ester of the component (C) is a fatty acid having 6 to 22 carbon atoms. 16. The water-soluble metalworking oil according to claim 1, wherein the fatty acid used as a raw material of the polyol ester of the component (C) is a linear or branched fatty acid having 18 carbon atoms. . 17. The water-soluble compound according to any one of claims 1 to 16, wherein the fatty acid (dibasic acid) used as a raw material of the dibasic acid ester of the component (D) is a fatty acid having 10 to 44 carbon atoms. Metalworking oil agent. 18. The alcohol as a raw material of the dibasic acid ester of the component (D) is a saturated or unsaturated, straight-chain or branched-chain alcohol having 8 to 22 carbon atoms.
18. The water-soluble metalworking oil according to any one of items 17. 19. The water-soluble metalworking oil according to claim 18, wherein the alcohol used as a raw material of the dibasic acid ester of the component (D) is an unsaturated linear alcohol having 8 to 22 carbon atoms.