JPWO2017171069A1 - Water-insoluble metalworking oil composition - Google Patents

Abstract

92 to 99.9 parts by mass of base oil (A) having a kinematic viscosity at 40 ° C. of 5 to 20 mm ² / s, and a dehydration condensate of aliphatic carboxylic acid (b1) having 10 to 24 carbon atoms, and carbon At least one carboxylic acid dehydration condensate (B) selected from dehydration condensates of aliphatic carboxylic acid (b1) having a number of 10 to 24 and carboxylic acid (b2) different from aliphatic carboxylic acid (b1) A water-insoluble metalworking oil composition containing 0.1 to 8 parts by mass of the base oil (A) and the carboxylic acid dehydration condensate (B) in total.

Description

  The present invention relates to a water-insoluble metal working oil composition used for metal working for cutting and / or grinding a metal, and a metal working method.

  The present invention relates to a water-insoluble metal working oil composition and a metal working method, and relates to a water-insoluble metal working oil composition and a metal working method used for cutting and / or grinding of difficult-to-work materials such as stainless steel. .

In the metal processing field such as cutting and grinding, water-insoluble metal processing containing sulfur compounds, for example, elemental sulfur, for the purpose of improving cutting workability and grinding workability and prolonging tool life. Oil compositions are widely used.
The following are examples of problems when adding elemental sulfur as a sulfur compound. For example, since the solubility of elemental sulfur in the lubricating oil is low, the blending amount is small. Further, in a low-temperature environment (for example, in winter), sulfur is precipitated and / or deposited, and the amount of dissolved sulfur is further reduced, so that the processing performance is deteriorated.
In order to improve the above problems, Patent Documents 1 to 3 use other additives in addition to simple sulfur to improve cutting workability and grinding workability. For example, Patent Document 1 discloses a metal grinding oil composition containing alkali metal borate hydrate having an average particle size of 1 μm or less in addition to elemental sulfur, and Patent Document 2 discloses an average particle size of 0 in addition to elemental sulfur. A metal grinding oil composition containing ultrafine sodium carbonate of 1 μm or less is disclosed. Patent Document 3 discloses a metal grinding oil containing a surfactant together with elemental sulfur.

JP-A-5-132686 JP-A-5-132687 Japanese Patent Laid-Open No. 4-335095

By the way, a large amount of heat is usually generated during cutting and / or grinding. Therefore, the water-insoluble metal processing oil used is exposed to high temperature and becomes mist or fume. At this time, if the sulfur odor is strong, the working environment is remarkably deteriorated. Therefore, it is required that the odor caused by the sulfur compound is not generated as much as possible.
In addition, in production sites such as cutting and / or grinding lines, water may be mixed due to various factors. Therefore, it is necessary to be excellent in water separability at the time of water mixing.

  The present invention has been made in view of the above circumstances. That is, the problem of the present invention is to reduce the odor in the working environment by suppressing the use of sulfur-based compounds as much as possible, and at the same time, is excellent in metal workability such as cutting workability and grinding workability, and is excellent in water separability. It is to provide a water-insoluble metalworking oil composition and a metalworking method using the composition.

As a result of intensive studies, the present inventors have found that the water-insoluble metalworking oil composition can solve the above-described problems by including specific amounts of specific components (A) and (B) as essential components. Completed the invention.
That is, the present invention provides the following [1] and [2].
[1] 92 to 99.9 parts by mass of base oil (A) having a kinematic viscosity at 40 ° C. of 5 to 20 mm ² / s and a dehydration condensate of aliphatic carboxylic acid (b1) having 10 to 24 carbon atoms And at least one carboxylic acid dehydration condensate selected from dehydration condensates of aliphatic carboxylic acid (b1) having 10 to 24 carbon atoms and carboxylic acid (b2) different from aliphatic carboxylic acid (b1) A water-insoluble metalworking oil composition containing 0.1 to 8 parts by mass of (B) and having a total of 100 parts by mass of the base oil (A) and the carboxylic acid dehydration condensate (B).
[2] A metal processing method of processing a metal using the water-insoluble metal processing oil composition according to the above [1].

  ADVANTAGE OF THE INVENTION According to this invention, the water-insoluble metalworking oil composition which is excellent in metal workability, such as cutting workability and grinding workability, and is excellent in water separability while reducing the odor in a work environment, and this composition The metal processing method using can be provided.

It is the schematic which shows the apparatus for grinding tests used in the Example and the comparative example.

Hereinafter, embodiments of the present invention will be described in detail.
[Water-insoluble metalworking oil composition]
The water-insoluble metalworking oil composition according to the present embodiment contains the following component (A) and component (B) at a specific ratio. In addition, the sum total of a component (A) and (B) is 100 mass parts.
Moreover, kinematic viscosity in this specification means kinematic viscosity measured based on JISK2283: 2000.

<Base oil (A)>
The base oil (A) contained in the water-insoluble metalworking oil composition of this embodiment is required to have a kinematic viscosity at 40 ° C. of 5 to 20 mm ² / s. When the kinematic viscosity of the base oil at 40 ° C. is less than 5 mm ² / s, the flash point is low, which is not preferable in terms of safety. If the kinematic viscosity at 40 ° C. exceeds 20 mm ² / s, the working environment is deteriorated such as adhesion to the machine tool, which is not preferable. Further, for example, there is a possibility of clogging of a grindstone used during grinding, which is not preferable. If the kinematic viscosity at 40 ° C. is 5 to 20 mm ² / s, the cooling property during cutting and / or grinding can be improved.
Kinematic viscosity at 40 ° C. of the base oil (A) is preferably a 6 to 15 mm ² / s, more preferably 8 to 12 mm ² / s.

The base oil (A) is not particularly limited as long as the kinematic viscosity at 40 ° C. is 5 to 20 mm ² / s, and those normally contained in metal working oil for cutting and / or grinding can be appropriately selected and used. . Specific examples include at least one selected from mineral oil and synthetic oil.
As mineral oil, for example, distillate obtained by subjecting paraffinic crude oil, mixed crude oil or naphthenic crude oil to atmospheric distillation, or distilling the residual oil of atmospheric distillation under reduced pressure, or purifying this according to a conventional method The refined oil obtained by doing this, for example, solvent refined oil, hydrogenated refined oil, dewaxed oil, clay-treated oil, etc. can be mentioned.
Synthetic oils include, for example, polybutene, polypropylene, α-olefin oligomers having 8 to 14 carbon atoms and their hydrides, as well as polyol esters (trimethylolpropane fatty acid ester, pentaerythritol fatty acid ester, etc.) and dibasic acid esters. And ester compounds such as aromatic polycarboxylic acid esters and phosphoric acid esters, alkyl aromatic compounds such as alkylbenzene and alkylnaphthalene, polyglycol oils such as polyalkylene glycol, and silicone oils.
One type of these base oils may be used, or two or more types may be used in appropriate combination.

The water-insoluble metalworking oil composition of the present embodiment contains 92 to 99.9 parts by mass of the base oil (A). When the content of the substrate (A) is less than 92 parts by mass, it is disadvantageous in terms of cost. Moreover, when content of a base material (A) exceeds 99.9 mass parts, the following active ingredient (B) is not fully contained, but it is unpreferable since it is inferior to processing performance, for example, grindability and machinability.
Content of the said base oil (A) becomes like this. Preferably it is 93-99.5 mass parts, More preferably, it is 95-99 mass parts.

<Carboxylic acid dehydration condensate (B)>
The water-insoluble metalworking oil composition of this embodiment includes a dehydration condensate of an aliphatic carboxylic acid (b1) having 10 to 24 carbon atoms and an aliphatic carboxylic acid (b1) having 10 to 24 carbon atoms. And at least one carboxylic acid dehydration condensate (B) selected from dehydration condensates of aliphatic carboxylic acid (b1) and different carboxylic acid (b2).
As the aliphatic carboxylic acid (b1) having 10 to 24 carbon atoms, for example, a naturally derived carboxylic acid can be used. Specific examples of naturally occurring carboxylic acids having 10 to 24 carbon atoms include naturally occurring saturated aliphatic carboxylic acids such as castor oil and tall oil fatty acid, and unsaturated aliphatic carboxylic acids having a carboxyl group and a double bond. Can be listed.
Examples of saturated aliphatic carboxylic acids include capric acid, neodecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid and lignoceric acid. Examples of unsaturated aliphatic carboxylic acids include undecylenic acid, oleic acid, elaidic acid, erucic acid, nervonic acid, linoleic acid, ricinoleic acid, γ-linolenic acid, arachidonic acid, α-linolenic acid, stearidonic acid, eicosapentaenoic acid, And docosahexaenoic acid. Among them, the aliphatic carboxylic acid (b1) is preferably ricinoleic acid having one alcoholic hydroxyl group, one carboxyl group, and one double bond.

The carboxylic acid (b2) different from the aliphatic carboxylic acid (b1) having 10 to 24 carbon atoms may be a mono- or higher valent saturated aliphatic carboxylic acid or an unsaturated aliphatic carboxylic acid. However, when a carboxylic acid having a small number of carbon atoms remains as an unreacted substance, an aliphatic carboxylic acid having 4 or more carbon atoms is preferable because it may cause an unpleasant odor or metal corrosion. The upper limit of the carbon number of the aliphatic carboxylic acid is not particularly limited, but is usually 30.
Examples of saturated aliphatic carboxylic acids include caproic acid, enanthic acid, caprylic acid, 2-ethylhexanoic acid, pelargonic acid, isononanoic acid, capric acid, neodecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, Examples include behenic acid and lignoceric acid. Examples of unsaturated aliphatic carboxylic acids include undecylenic acid, oleic acid, elaidic acid, erucic acid, nervonic acid, linoleic acid, γ-linolenic acid, arachidonic acid, α-linolenic acid, stearidonic acid, eicosapentaenoic acid, and docosahexaenoic acid Etc.
The carboxylic acid (b2) different from the aliphatic carboxylic acid (b1) may be different from the carboxylic acid selected as the aliphatic carboxylic acid (b1), and the carbon number thereof overlaps with the aliphatic carboxylic acid (b1). May be. Among these, aliphatic carboxylic acids having 10 to 24 carbon atoms are preferable, and aliphatic carboxylic acids having 12 to 20 carbon atoms are more preferable.

The dehydration condensate of aliphatic carboxylic acid (b1) having 10 to 24 carbon atoms can be obtained by dehydrating condensation of aliphatic carboxylic acid (b1) such as ricinoleic acid. For example, dehydration condensation starts by heating to about 200 ° C. in an inert atmosphere, and a dehydration condensate can be obtained.
A dehydration condensate of an aliphatic carboxylic acid (b1) having 10 to 24 carbon atoms and a carboxylic acid (b2) different from the (b1) is added to the carboxylic acid (b2) in addition to the aliphatic carboxylic acid (b1). Can be obtained by adding dehydration condensation. As an example, a combination in which the aliphatic carboxylic acid (b1) is ricinoleic acid and the carboxylic acid (b2) is oleic acid can be mentioned.
The degree of polymerization of the dehydration condensate is adjusted by the reaction time of the dehydration condensation. If the reaction time is long, a condensate having a high degree of polymerization can be obtained.

The degree of polymerization of the carboxylic acid dehydration condensate (B) can be represented by an acid value. In this embodiment, the acid value of the carboxylic acid dehydration condensate (B) is preferably 5 to 100 mgKOH / g, more preferably 7 to 95 mgKOH / g, and still more preferably 10 to 90 mgKOH / g. When the acid value of the carboxylic acid dehydration condensate (B) is in the above range, excellent processing performance, for example, a high grinding amount can be achieved. In addition, when the acid value of a carboxylic acid dehydration condensate (B) is less than 5 mgKOH / g, there exists a possibility that the viscosity of water-insoluble metalworking oil composition itself may rise, and it may become a processing defect.
The carboxylic acid dehydration condensate (B) in the present embodiment preferably has a hydroxyl value of 5 to 50 mgKOH / g, more preferably 10 to 40 mgKOH / g, and still more preferably 13 to 35 mgKOH / g. When the hydroxyl value of the carboxylic acid dehydration condensate (B) is in the above range, excellent processing performance, for example, a high grinding amount can be achieved.
Moreover, the carboxylic acid dehydration condensate (B) in the present embodiment preferably has a saponification value of 150 to 250 mgKOH / g, more preferably 180 to 210 mgKOH / g, and still more preferably 190 to 200 mgKOH / g. When the saponification value of the carboxylic acid dehydration condensate (B) is in the above range, excellent processing performance, for example, a high grinding amount can be achieved.
Here, the acid value is a value measured based on JIS K 2501: 2003 (indicator method), the hydroxyl value is a value measured based on JIS K 0070: 1992, and the saponification value is JIS K 2501: 2003. It is a value measured based on K 2503: 2010.
The free hydroxyl group that the obtained carboxylic acid dehydration condensate (B) may have may be capped with any carboxylic acid. The carboxylic acid used for capping is not particularly limited.

The water-insoluble metalworking oil composition in this embodiment includes a dehydration condensate of an aliphatic carboxylic acid (b1) having 10 to 24 carbon atoms and an aliphatic carboxylic acid (b1) having 10 to 24 carbon atoms. And 0.1-8 mass parts of at least 1 sort (s) of carboxylic acid dehydration condensate (B) chosen from the dehydration condensate of carboxylic acid (b2) different from aliphatic carboxylic acid (b1) is contained. In addition, when it contains multiple types of carboxylic acid dehydration condensate (B), the total amount shall fall in the said range.
When the content of the component (B) is less than 0.1 parts by mass, the processing performance, for example, the grinding amount is inferior. Moreover, when the said content exceeds 8 mass parts, the viscosity of a water-insoluble metalworking oil composition will become high, and there exists a tendency for it to be inferior to the washing | cleaning effect | action which wash | cleans the chip produced by grinding. Moreover, it is inferior to handling property.
The content of the carboxylic acid dehydration condensate (B) in the water-insoluble metalworking oil composition is preferably 0.5 to 7 parts by mass, more preferably 1 to 6 parts by mass.

<Other ingredients>
The water-insoluble metalworking oil composition of the present embodiment can further contain other components within a range that does not impair the purpose of the present embodiment. As other additives, at least one selected from the group consisting of oiliness agents, extreme pressure agents, antiwear agents, antioxidants, metal deactivators, rust inhibitors, dispersants, antifoaming agents, and mist inhibitors. Mention may be made of seed additives (C).

<Oil agent, extreme pressure agent, antiwear agent>
Examples of the oily agent include maleic acid, alkyl or alkenyl maleic acid, oxalic acid, succinic acid, dibasic acid and esters represented by alkyl or alkenyl succinic acid, tribasic acid and esters thereof, rapeseed oil, soybean white extract Examples include fatty acids such as oil, fatty acid esters, and fats.
As extreme pressure agents, simple sulfur such as bulk, powder and molten liquid, sulfur-based extreme pressure agents such as sulfurized fat and polysulfide, and chlorinated paraffin, chlorinated fat, chlorinated fatty acid ester, chlorinated fatty acid, etc. Chlorine extreme pressure agent, phosphate ester, thiophosphate ester, dithiophosphate ester, phosphate ester amine salt, thiophosphate ester amine salt, dithiophosphate ester amine salt, phosphite ester, thiophosphite ester, dithiophosphite Examples thereof include phosphorus extreme pressure agents such as acid esters.
Examples of the antiwear agent include zinc dithiophosphate (ZnDTP), zinc dithiocarbamate (ZnDTC), molybdenum sulfide oxydithiophosphate (MoDTP), and molybdenum sulfide oxydithiocarbamate (MoDTC).

<Antioxidant, metal deactivator>
Examples of the antioxidant include amine-based antioxidants such as diphenylamine, alkyldiphenylamine, phenyl-α-naphthylamine, alkylphenyl-α-naphthylamine, and 4,4′-methylene-bis-2,6-di-t-butylphenol. , 2,6-di-t-butyl-p-cresol (DBPC), phenolic antioxidants, sulfur antioxidants, molybdenum amine complex antioxidants, and the like.
Examples of the metal deactivator include benzotriazole, triazole derivatives, benzotriazole derivatives, thiadiazole derivatives, and the like.

<Antirust agent, dispersant, antifoaming agent, mist inhibitor>
Examples of the rust inhibitor include fatty acid esters of polyhydric alcohols such as sorbitan fatty acid esters.
Examples of the dispersant include ashless dispersants such as alkyl or alkenyl succinimides, alkyl or alkenyl succinates, and acid amides.
Examples of the antifoaming agent include silicone-based antifoaming agents such as dimethylpolysiloxane and fluoroethers.
As the mist inhibitor, hydrocarbon polymer compounds such as polyisobutylene and ethylene-propylene copolymer can be used. The number average molecular weight of the polymer compound is preferably 100,000 to 3,000,000, and more preferably 200,000 to 2,000,000.

The water-insoluble metalworking oil composition of the present embodiment comprises an oily agent, extreme pressure agent, antiwear agent, antioxidant, metal deactivator, rust inhibitor, dispersant, antifoaming agent and mist inhibitor. At least one additive (C) selected from the group consisting of 0.2 to 3 masses independently for a total of 100 mass parts of the base oil (A) and the carboxylic acid dehydration condensate (B). It is preferable to contain a part.
If the amount of component (C) added is independently within the above range, the effect of each component is sufficiently exhibited. The amount of the component (C) added is independently more preferably 0.2 to 2.5 parts by mass, and still more preferably 0.4 to 2 parts by mass.
In one aspect of the present invention, the total content of the base oil (A) and the carboxylic acid dehydration condensate (B) is preferably from 80 to 80, based on the total amount (100% by mass) of the water-insoluble metalworking oil composition. It is 100 mass%, More preferably, it is 95-100 mass%.
In another embodiment of the present invention, the total content of the base oil (A), the carboxylic acid dehydration condensate (B) and the component (C) is based on the total amount (100% by mass) of the water-insoluble metalworking oil composition. , Preferably it is 90-100 mass%, More preferably, it is 95-100 mass%.

  The water-insoluble metal working oil composition of this embodiment can be suitably used for metal working, for example, metal cutting and / or grinding, and is preferably used as a grinding oil used for metal grinding. The metal to be processed is not particularly limited, but preferably, iron-based materials such as stainless steel, alloy steel, and carbon steel, aluminum alloys, copper alloys, and the like are mentioned, but iron-based materials, among which stainless steel is preferable. .

Next, a metal working method using the water-insoluble metal working oil composition of the present embodiment and use of the composition will be described.
<Metal processing method>
The metal processing method in this embodiment processes a metal using the water-insoluble metal processing oil composition mentioned above. Examples of metal processing performed using the water-insoluble metal processing oil composition of the present embodiment include various metal processing such as cutting, grinding, punching, polishing, drawing, drawing, and rolling. Among them, grinding is preferable. As a grinding process, the method of grinding a metal with a grinding belt can be mentioned, for example. A grinding belt is an abrasive tool consisting of an endless belt with an abrasive (abrasive grain) bonded to the surface of a substrate made of cloth, paper, plastic, rubber, etc., and is usually used in grinding. It is possible to select and use one appropriately. As the abrasive grains, for example, alumina can be used. The metal to be processed by this method is as described above.
In addition, since the water-insoluble metalworking oil composition of this embodiment has favorable grindability and can increase the amount of grinding, it can be used suitably for so-called rough grinding.
In the grinding process using the grinding belt, for example, as shown in FIG. 1, the workpiece 5 conveyed by the conveyor belt 4 or the like rotates and travels between two or more rollers such as the idle roll 1 and the contact roll 2. This is performed by pressing the surface of the grinding belt 3. At this time, the water-insoluble metalworking oil composition 6 of this embodiment is supplied to the part (grinding part) of the work material 5 to which the belt is pressed. For example, the water-insoluble metalworking oil composition 6 of the present embodiment is supplied to the grinding unit from an oil tank 7 provided below the conveying belt 4, and the material that has fallen from the grinding unit is returned to the tank 7. In this way, it is supplied to the grinding part while circulating.
Moreover, use in the said metal processing method of the water-insoluble metal processing oil composition of this embodiment is also provided.

  Next, the present embodiment will be specifically described by way of examples, but is not limited by these examples.

<Each evaluation method>
(1) Grinding performance The following metal processing was performed using each water-insoluble metal processing oil composition. Grindability was evaluated using a grinding test apparatus schematically shown in FIG. As shown in FIG. 1, the work material 5 placed on the conveyor belt 4 is pressed against the grinding belt 3 that rotates between the idle roll 1 and the contact roll 2, and on the other hand, the above-mentioned non-grinding part is pressed against the grinding part. The water-soluble metalworking oil composition 6 is ground while being circulated and supplied from the oil tank 7. Five work material plates are used per test, and the plates are continuously passed without any gaps. Evaluation items and test conditions are as follows.
(Evaluation item)
The test was conducted for a total of 100 passes, and the grinding amount (g) was measured. When the grinding amount is 500 g or more, the evaluation is A, and the grindability of A evaluation is acceptable. On the other hand, when the weight is less than 400 to 500 g, B is evaluated, and when the weight is less than 400 g, C is evaluated.
(Test conditions)
・ Grinding belt: No. 80 alumina ・ Material to be ground: SUS304, width 90 mm × length 1,000 mm × thickness of about 3 mm, 5 plates per test, speed: belt speed; 1400 m / min, plate feed speed; 10m / min
・ Polishing method: Down cut ・ Tank oil temperature: 40 ℃
・ Load: 1.5hp / inch (Evaluation with constant belt pressing force)

(2) Water separability 20 g of each metalworking oil composition and 20 g of water were weighed into a 50 ml cylinder and shaken vigorously for 30 seconds. The solution state after 3 hours was observed and evaluated according to the following evaluation criteria.
A: No emulsified layer, B: Emulsified layer is less than 1 mm, C: Emulsified layer is 1 mm or more.
(3) Odor Evaluation Each metalworking oil composition was hung on a hot stirrer at 100 ° C., and the odor was evaluated according to the following evaluation criteria.
A: Slight odor, C: Strong odor (4) Comprehensive evaluation Based on the evaluations of (1) to (3) above, evaluation was made in three stages (A: excellent, B: slightly inferior, C: inferior).

Examples 1-5 and Comparative Examples 1-7
Water-insoluble metalworking oil compositions were prepared using the materials shown in Table 1-1 and Table 1-2 in the proportions shown in the same table. As described above, various performances (grindability, water separability and odor) were evaluated, and comprehensive evaluations (A to C) were performed based on each performance. The results are also shown in Tables 1-1 and 1-2. The unit of the amount of each composition is “parts by mass”.

The compounding materials are as follows.
<Material>
(1) Base oil (A)
Paraffinic base oil (40 ° C. kinematic viscosity: 9.918 mm ² / s, 100 ° C. kinematic viscosity: 2.714 mm ² / s: measured according to JIS K 2283: 2000)
(2) Carboxylic acid dehydration condensate (B)
Carboxylic acid dehydration condensate 1: Condensation product obtained by heat dehydration condensation of ricinoleic acid at 200 ° C. under a nitrogen stream, followed by heat dehydration condensation by adding oleic acid, acid value: 90 mgKOH / g, hydroxyl value: 15 mgKOH / g, saponification value 195 mg KOH / g
Carboxylic acid dehydration condensate 2: Condensation product obtained by heat dehydration condensation of ricinoleic acid at 200 ° C. in a nitrogen stream, followed by heat dehydration condensation by adding oleic acid, acid value: 34 mg KOH / g, hydroxyl value: 28 mg KOH / g, saponification value : 198mgKOH / g
Carboxylic acid dehydration condensate 3: Condensation product obtained by heat dehydration condensation of ricinoleic acid at 200 ° C. in a nitrogen stream, followed by heat dehydration condensation by adding oleic acid, acid value: 10 mgKOH / g, hydroxyl value: 33 mgKOH / g, saponification value 192 mg KOH / g
(3) (components used in comparative examples)
Polysulfide: 40 ° C. kinematic viscosity: 48.65 mm ² / s, S content: 39.5% by mass
Ca sulfonate: base number 495 mg KOH / g, Ca content: 18.5% by mass
ZnDTP: S content: 15.0 mass%, P content: 7.5 mass%, Zn content: 8.5 mass%
Na sulfonate: Base number 450 mg KOH / g, Na content: 19.5% by mass
・ Thiadiazole derivative: S content: 36% by mass, N content: 49% by mass
(4) Other additives (C)
・ Phenolic antioxidant: 2,6-di-tert-butylparacresol ・ Silicone antifoaming agent: dimethylpolysiloxane

  Each of the water-insoluble metalworking oil compositions of Examples 1 to 5 is excellent in grinding processing, water separability, and odor evaluation with evaluation A and overall evaluation is A, indicating that it is excellent in grinding processing. In Comparative Example 1 containing only the base oil (A) containing no additive, the grinding amount is small, and it can be seen that the base oil alone is insufficient as a metal working oil. In Comparative Examples 2 to 7 in which each component was added instead of the component (B) of the present embodiment, the grindability, the water separation property, and the odor were inferior, and none of the comprehensive evaluation was A.

  According to this embodiment, the water-insoluble metalworking oil composition which is excellent in metal workability, such as cutting workability and grinding workability, and is excellent in water separability while reducing the odor in a work environment is obtained. The water-insoluble metal working oil composition of the present embodiment can be suitably used for cutting or grinding, particularly grinding using a grinding belt.

1: idle roll, 2: contact roll, 3: grinding belt, 4: transport belt, 5: work material, 6: water-insoluble metalworking oil composition, 7: oil tank

Claims (8)

92 to 99.9 parts by mass of base oil (A) having a kinematic viscosity at 40 ° C. of 5 to 20 mm ² / s, and a dehydration condensate of aliphatic carboxylic acid (b1) having 10 to 24 carbon atoms, and carbon At least one carboxylic acid dehydration condensate (B) selected from dehydration condensates of aliphatic carboxylic acid (b1) having a number of 10 to 24 and carboxylic acid (b2) different from aliphatic carboxylic acid (b1) A water-insoluble metalworking oil composition containing 0.1 to 8 parts by mass of the base oil (A) and the carboxylic acid dehydration condensate (B) in total.   The water-insoluble metalworking oil composition according to claim 1, wherein the aliphatic carboxylic acid (b1) having 10 to 24 carbon atoms is ricinoleic acid.   The water-insoluble metalworking oil composition according to claim 1 or 2, wherein the acid value of the carboxylic acid dehydration condensate (B) is 5 to 100 mgKOH / g.   Further, at least one additive selected from the group consisting of oiliness agents, extreme pressure agents, antiwear agents, antioxidants, metal deactivators, rust inhibitors, dispersants, antifoaming agents, and mist inhibitors. Any one of Claims 1-3 which contains 0.2-3 mass parts each independently with respect to a total of 100 mass parts of (C) base oil (A) and a carboxylic acid dehydration condensate (B). The water-insoluble metalworking oil composition according to one item.   The water-insoluble metalworking oil composition according to any one of claims 1 to 4, which is used for metal grinding.   The water-insoluble metalworking oil composition according to claim 5, wherein the metal is an iron-based material.   The metal processing method of processing a metal using the water-insoluble metalworking oil composition as described in any one of Claims 1-6.   The metal processing method according to claim 7, wherein the metal is ground by a grinding belt.

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