JP6979009B2 - Water-soluble metalworking oil composition, metalworking liquid and metalworking method - Google Patents

Description

The present invention relates to a water-soluble metalworking oil composition, a metalworking liquid and a metalworking method used for metalworking to cut and / or grind a metal.

The present invention relates to a water-soluble metalworking oil composition, for example, a water-soluble metalworking oil composition used for cutting and / or grinding a difficult-to-process material such as stainless steel.

In the field of metal processing such as cutting and grinding, metal processing oil is used for the purpose of improving processing efficiency, suppressing friction between the work material and the tool that processes the work material, extending the life of the tool, and removing chips. Is used. Metalworking oils include those containing oils such as mineral oils, animal and vegetable oils, and synthetic oils as main components, and oils containing a compound having surface activity to impart water solubility. In recent years, water-soluble metalworking oils to which water solubility has been imparted have come to be widely used in view of safety and the like, for example, in view of suppressing fire caused by heat generation during processing.

Extreme pressure agents such as sulfur-based, phosphorus-based, chlorine-based and organic metal salts are widely used in water-soluble metalworking oils from the viewpoint of improving the efficiency of cutting and grinding (for example, Patent Document 1, Patent Document 1, 2). On the other hand, due to concerns about environmental load and adverse effects on the human body, water-soluble metalworking oils that do not contain the above extreme pressure agents are also being studied. For example, water-soluble metalworking oils containing a polymer of a carboxylic acid such as ricinoleic acid. Is known (see, for example, Patent Documents 3 and 4). Attempts have been made to increase the solubility of such a carboxylic acid polymer in water, for example, by using it in combination with a base.
Patent Document 3 discloses a water-soluble metal processing oil containing a polycondensate of a hydroxy fatty acid having 18 to 20 carbon atoms and one or more hydroxyl groups and a monohydroxy fatty acid having 18 to 20 carbon atoms and a base as essential components. To. Further, Patent Document 4 discloses a water-soluble lubricating oil composition containing a vegetable oil and a nitrogen-containing cyclic compound together with a hydroxy fatty acid polycondensate.

Japanese Unexamined Patent Publication No. 3-177448 Japanese Unexamined Patent Publication No. 11-279581 Japanese Unexamined Patent Publication No. 10-195475 Japanese Unexamined Patent Publication No. 2005-220170

However, with the water-soluble metal processing oils disclosed in Patent Documents 3 and 4, there is a tendency that sufficient processing performance cannot be obtained when grinding a difficult-to-process material having high processing difficulty, for example, stainless steel. Further, when the water-soluble metal processing oil composition is used, it is difficult to obtain processing performance equivalent to that of the water-insoluble metal processing oil, for example, a high grinding amount.

The present invention has been made in view of the above circumstances. That is, the subject of the present invention is a water-soluble metalworking oil composition that is suitable for use in metalworking of difficult-to-process materials such as stainless steel and has processing performance equivalent to that of water-insoluble metalworking oil, for example, high grinding performance. An object of the present invention is to provide a metalworking liquid obtained by diluting the water-soluble metalworking oil composition with water, and a metalworking method using these.

As a result of diligent studies, the present inventors have found that the above-mentioned problems can be solved by including a specific amount of the specific components (A) to (C) as essential components in the water-soluble lubricating oil composition, and the following inventions have been developed. Completed.
That is, the present invention provides the following [1] to [3].
[1] Base material (A) is 3.5 to 20% by mass,
A carboxylic acid dehydration condensation product (B1) obtained by dehydrating and condensing at least one type of carboxylic acid having 10 to 24 carbon atoms, or a mixture (B2) of the carboxylic acid dehydration condensation product (B1) and a carboxylic acid (B'). 34-76% by mass, and 9-39% by mass of amine (C)
A water-soluble metalworking oil composition containing.
[2] A metal processing liquid obtained by diluting the water-soluble metal processing oil composition according to the above [1] with water.
[3] A metal processing method for processing a metal using the water-soluble metal processing oil composition according to the above [1] or the metal processing liquid according to the above [2].

According to the present invention, a water-soluble metal processing oil composition suitable for use in metal processing of difficult-to-process materials such as stainless steel and having processing performance equivalent to that of water-insoluble metal processing oil, said water-soluble metal processing oil composition. It is possible to provide a metal processing liquid obtained by diluting an object with water, and a metal processing method using these.

It is a schematic diagram which shows the grinding test apparatus used in an Example and a comparative example.

Hereinafter, embodiments of the present invention will be described in detail.
[Water-soluble metalworking oil composition (undiluted solution)]
The water-soluble metalworking oil composition (hereinafter, also referred to as “undiluted solution”) according to the embodiment of the present invention contains the following component (A), component (B1) or (B2), and component (C).
The total content of the components (A) to (C) in the water-soluble metalworking oil composition of the present embodiment shall not exceed 100% by mass.

<Base material (A)>
As the base material (A) contained in the water-soluble metalworking oil composition of the present embodiment, at least one selected from water and a base oil can be used. The base material (A) may be only water or a base oil, or may be a mixture of water and a base oil. The water used as the base material (A) is not particularly limited, and may be distilled water, ion-exchanged water, tap water, industrial water, or the like.

The base oil used as the base material (A) is not particularly limited, and those contained in the metalworking oil for normal cutting and / or grinding can be appropriately selected and used. Specific examples include mineral oil and synthetic oil.
As the mineral oil, for example, paraffin crude oil, mixed crude oil or naphthenic crude oil is distilled at atmospheric pressure, or distillate oil obtained by vacuum distillation of residual oil of atmospheric pressure distillation, or refined according to a conventional method. Examples thereof include refined oils obtained by the above, solvent refined oils, hydrogenated refined oils, dewazing treated oils, white clay treated oils and the like.
Examples of synthetic oils include polybutene, polypropylene, α-olefin oligomers having 8 to 14 carbon atoms and hydrides thereof, and polyol esters (such as trimethylolpropane fatty acid esters and pentaerythritol fatty acid esters) and dibasic acid esters. Examples thereof include 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 glycols, and silicone oils.

These base oils may be used alone or in combination of two or more as appropriate. As the base oil, kinematic viscosity at generally 40 ° C. is 1 to 1000 mm ² / s, preferably those of 2~500mm ² / s is used.
In the present specification, the kinematic viscosity is measured in accordance with JIS K 2283: 2000.

The water-soluble metalworking oil composition of the present invention contains the base material (A) in an amount of 3.5 to 20% by mass, preferably 4 to 18% by mass, more preferably 4 to 17% by mass, still more preferably 5 to 10%. Contains% by mass. If the content of the base material (A) is less than 3.5% by mass, it is disadvantageous in terms of cost and the stability of the undiluted solution cannot be sufficiently ensured. Further, if the content of the base material (A) exceeds 20% by mass, the stability of the undiluted solution cannot be sufficiently ensured.

In the present embodiment, the water-soluble metal processing oil composition is a carboxylic acid dehydration condensate (B1) obtained by dehydrating and condensing at least one carboxylic acid having 10 to 24 carbon atoms as a component derived from the carboxylic acid, or the carboxylic acid. It contains a mixture (B2) of an acid dehydration condensate (B1) and a carboxylic acid (B'). The details will be described below.

<Carboxylic acid dehydration condensate (B1)>
The water-soluble metalworking oil composition of the present embodiment contains a carboxylic acid dehydration condensate (B1) obtained by dehydrating and condensing at least one carboxylic acid having 10 to 24 carbon atoms. Specific embodiments of the carboxylic acid dehydration condensate (B1) include, for example, a dehydration condensate of a carboxylic acid (b1) having 12 to 22 carbon atoms, and a carboxylic acid (b1) having 12 to 22 carbon atoms and the above (b1). Examples thereof include at least one carboxylic acid dehydration condensate selected from the dehydration condensates of carboxylic acid (b2) different from b1).
As the carboxylic acid (b1) having 12 to 22 carbon atoms, a naturally occurring carboxylic acid can be used. Such naturally-derived carboxylic acids having 12 to 22 carbon atoms include, for example, unsaturated carboxylic acids having one alcoholic hydroxyl group, one carboxyl group, and one double bond, specifically, ricinol acid (12-hydroxyocta). Deca-9-enoic acid) can be mentioned. Also, carboxylic acids that can be contained in natural castor oil can be used.

The carboxylic acid (b2) different from (b1) may be a monovalent or higher saturated aliphatic carboxylic acid or an unsaturated aliphatic carboxylic acid. However, if a carboxylic acid having a small carbon number remains as an unreacted product, it may cause an unpleasant odor or metal corrosion. Therefore, an aliphatic carboxylic acid having 4 or more carbon atoms is preferable. The upper limit of the number of carbon atoms of the aliphatic carboxylic acid is not particularly limited, but is usually 30.
Saturated aliphatic carboxylic acids include caproic acid, enanthic acid, capric acid, 2-ethylhexanoic acid, pelargonic acid, isononanoic acid, caproic acid, neodecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, and arachidic acid. Examples include behenic acid and lignoseric acid. 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. And so on.
The carboxylic acid (b2) different from the carboxylic acid (b1) may be different from the carboxylic acid selected as the carboxylic acid (b1), and its carbon number may overlap with the carboxylic acid (b1). Of these, an aliphatic carboxylic acid having 10 to 24 carbon atoms is preferable, and an aliphatic carboxylic acid having 12 to 20 carbon atoms is more preferable.

The dehydration condensation product of the carboxylic acid (b1) having 12 to 22 carbon atoms can be obtained by dehydrating and condensing an unsaturated carboxylic acid such as ricinoleic acid. For example, by heating to about 200 ° C. in an inert atmosphere, dehydration condensation starts, and a dehydration condensation product can be obtained.
Further, the dehydration condensation product of the carboxylic acid (b1) having 12 to 22 carbon atoms and the carboxylic acid (b2) different from the (b1) is dehydrated and condensed by further adding the carboxylic acid (b2) to the carboxylic acid (b1). Can be obtained by doing.
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 dehydrated condensate of the carboxylic acid can be expressed by an acid value. In the present embodiment, a carboxylic acid dehydration condensate (B1) obtained by dehydrating and condensing at least one carboxylic acid having 10 to 24 carbon atoms, specifically, a dehydration condensate of a carboxylic acid (b1) having 12 to 22 carbon atoms. , And the acid value of at least one carboxylic acid dehydration condensate (B1) selected from the dehydration condensates of the carboxylic acid (b1) having 12 to 22 carbon atoms and the carboxylic acid (b2) different from the (b1). It is preferably 5 to 100 mgKOH / g, more preferably 20 to 100 mgKOH / g, and even more preferably 30 to 90 mgKOH / g. When the acid value of the carboxylic acid dehydration condensate (B1) is in the above range, excellent processing performance, for example, a high grinding amount can be achieved. If the acid value of the carboxylic acid dehydration condensate (B1) is less than 5 mgKOH / g, the viscosity of the water-soluble metalworking oil composition itself may increase, resulting in processing defects.
The free hydroxyl group of the obtained carboxylic acid dehydration condensate (B1) may be capped with any carboxylic acid. The carboxylic acid used for capping is not particularly limited.

<Mixture (B2) of carboxylic acid dehydration condensate (B1) and carboxylic acid (B')>
The water-soluble metalworking oil composition in the present embodiment may also include an embodiment (B2) of the carboxylic acid dehydration condensate (B1) and the carboxylic acid (B') as a component derived from the carboxylic acid. The carboxylic acid (B') may be either an unsaturated carboxylic acid or a saturated carboxylic acid, and may have a linear structure, a branched structure or a cyclic structure. For example, monocarboxylic acids and dicarboxylic acids having a total carbon number of 4 to 30 are preferable, and tall oil fatty acids and the like can be mentioned. The mixing ratio of the carboxylic acid dehydration condensate (B1) and the carboxylic acid (B') in the mixture (B2) can be arbitrarily determined so as to obtain the effects of the present application.

The water-soluble metal processing oil composition in the present embodiment has a carboxylic acid dehydration condensation product (B1) obtained by dehydrating and condensing at least one carboxylic acid having 10 to 24 carbon atoms, or the carboxylic acid dehydration condensation product (B1). It contains 34 to 76% by mass of a mixture (B2) with a carboxylic acid (B').
When the content of the component (B1) or the component (B2) is less than 34% by mass, the processing performance, for example, the grinding amount is inferior. If the content exceeds 76% by mass, the viscosity of the water-soluble metalworking oil composition becomes high, and the stock solution stability, the diluted solution stability, or both cannot be maintained. In addition, it is inferior in handleability.
The content of the component (B1) or the component (B2) in the water-soluble metalworking oil composition is preferably 34 to 75% by mass, more preferably 39 to 70% by mass, still more preferably 45 to 70% by mass, and particularly preferably. Is 50 to 65% by mass, most preferably 50 to 55% by mass.

<Component (C)>
The water-soluble metalworking oil composition in the present embodiment contains an amine as the component (C). The amine (C) preferably contains an amine (C-1) having a hydroxyl group and an amine (C-2) having no hydroxyl group. By using an amine (C-1) having a hydroxyl group and an amine (C-2) having no hydroxyl group in combination, a carboxylic acid dehydration condensate (B1) or a carboxylic acid dehydration condensate (B1) and a carboxylic acid ( Even if a mixture (B2) with B') is blended in a relatively large amount, it is possible to improve the undiluted stability of the water-soluble metal processing oil composition.

式中、ｎは０〜２の整数、ｍは１〜３の整数であって、但しｎ＋ｍは３である。Ｒ¹は炭素数１〜１８の炭化水素基、Ｒ²は炭素数１〜４の二価の飽和炭化水素基である。一分子中に複数あるＲ¹又はＲ²は、互いに同一であっても、異なっていてもよい。Examples of the amine (C-1) having a hydroxyl group include monoalkanolamine, dialkanolamine, and trialkanolamine, and specific examples thereof include compounds represented by the following general formula (I).

In the formula, n is an integer of 0 to 2, m is an integer of 1 to 3, and n + m is 3. R ¹ is a hydrocarbon group having 1 to 18 carbon atoms, and R ² is a divalent saturated hydrocarbon group having 1 to 4 carbon atoms. A plurality of R ¹ or R ^{2 in} one molecule may be the same as or different from each other.

Specific examples of alkanolamines include monoisopropanolamine, diolaylethanolamine, dilaurylpropanolamine, dioctylethanolamine, dibutylethanolamine, diethylethanolamine, dimethylethanolamine, dihexylpropanolamine, dibutylpropanolamine and other monoalkanolamines. Dialkanolamines such as diethanolamine, oleyldiethanolamine, cyclohexyldiethanolamine, stearyldipropanolamine, lauryldiethanolamine, octyldipropanolamine, butyldiethanolamine, methyldiethanolamine, benzyldiethanolamine, phenyldiethanolamine, trildipropanolamine, xsilyldiethanolamine; triethanol Examples thereof include trialkanolamines such as amines, tripropanolamines and triisopropanolamines.

Examples of the amine (C-2) having no hydroxyl group include an alkylamine having a saturated or unsaturated hydrocarbon group having 1 to 30 carbon atoms and having a linear, cyclic or branched shape. Examples of the hydrocarbon group include a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group, a cyclohexyl group, a heptyl group, a cycloheptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group and a dodecyl group. , Tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadesyl group, icosyl group, pentycocil group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, hexacosyl group, heptacosyl group, octacosyl group, nonacosyl group. Alkyl groups such as groups and triacontyl groups, hexenyl groups, heptenyl groups, octenyl groups, nonenyl groups, decenyl groups, undecenyl groups, dodecenyl groups, tridecenyl groups, tetradecenyl groups, pentadecenyl groups, hexadecenyl groups, heptadecenyl groups, octadecenyl groups, nonadesenyl groups. It has two or more alkenyl groups such as a group, an icosenyl group, a henicosenyl group, a docosenyl group, a tricosenyl group, a tetracosenyl group, a pentacosenyl group, a hexacosenyl group, a heptacosenyl group, an octacosenyl group, a nonacosenyl group and a triaconenyl group, and two or more double bonds. Hydrocarbon groups and the like can be mentioned. As the amine (C-2) having no hydroxyl group, any of primary to tertiary amines may be used.

In the present embodiment, specific examples of the combination of the amine having a hydroxyl group (C-1) and the amine having no hydroxyl group (C-2) include, for example, monoisopropanolamine, diisopropanolamine, triisopropanolamine, and Examples thereof include a combination of an amine (C-1) selected from the group consisting of diethanolamine and a dicyclohexylamine (C-2).

The water-soluble metalworking oil composition of the present embodiment contains 9 to 39% by mass of amine (C). When the content of the component (C) is less than 9% by mass, the putrefaction resistance is lowered and the stock solution stability is inferior. If the content of the component (C) exceeds 39% by mass, it is necessary to reduce the amount of other components in the formulation, and it becomes impossible to achieve both undiluted solution stability and metal workability, for example, grindability.
The content of the component (C) is preferably 10 to 35% by mass, more preferably 11 to 34% by mass in order to improve the putrefaction resistance while suppressing the adverse effect on the human body.

The mass ratio [(C-1) / (C-2)] of the amine (C-1) having a hydroxyl group and the amine (C-2) having no hydroxyl group is preferably 0.5 to 1. 4.4, more preferably 0.6 to 1.3, still more preferably 0.65 to 1.0. When the mass ratio [(C-1) / (C-2)] is in the above range, the stock solution stability of the water-soluble metal processing oil composition and the metal processing in which the water-soluble metal processing oil composition is diluted with water Excellent liquid dilution stability.
By blending the component (C) in the water-soluble metalworking oil composition, a salt is formed with the acid component ((B1), (B2) component, etc.) contained in the composition, and the acid component in the composition is formed. By increasing the solubility, excellent stock solution stability can be obtained.
As the base forming the salt with the acid component, for example, an alkali metal salt or the like may be used. However, in this embodiment, such an alkali metal salt is not used because the putrefaction resistance may decrease.

<Mass ratio relationship of components (A), (B1) and (B2)>
In the present embodiment, the mass ratio of the carboxylic acid dehydration condensation product (B1) or the mixture (B2) of the carboxylic acid dehydration condensation product (B1) and the carboxylic acid (B') to the substrate (A) [ (B1) / (A)] or [(B2) / (A)] is preferably 0.5 to 30. When the mass ratio of the component (B1) or (B2) to the component (A) is in the above range, sufficient processing performance, for example, grindability and undiluted stability of the water-soluble metalworking oil composition are compatible. Can be made to. The mass ratio [(B1) / (A)] or [(B2) / (A)] is more preferably 1 to 20, still more preferably 1 to 16, and particularly preferably 2 to 13.

<Mass ratio relationship between component (A) and component (C)>
In the present embodiment, the mass ratio [(C) / (A)] of the amine (C) and the base material (A) is preferably 0.1 to 7.0. When the mass ratio of the component (C) and the component (A) is in the above range, the undiluted stability of the water-soluble metalworking oil composition can be kept good, and the cost and handleability are excellent. The mass ratio [(C) / (A)] is more preferably 0.3 to 6.5, still more preferably 0.5 to 5.9, and particularly preferably 0.5 to 4.5. ..

<Mass ratio relationship between components (B1) and (B2) and component (C)>
In the present embodiment, the mass ratio of the carboxylic acid dehydration condensation product (B1) or the mixture (B2) of the carboxylic acid dehydration condensation product (B1) and the carboxylic acid (B') to the amine (C) [(). B1) / (C)] or [(B2) / (C)] is preferably 0.1 to 8.0. When the mass ratio of the component (B1) or (B2) to the component (C) is in the above range, sufficient processing performance, for example, grindability and undiluted stability of the water-soluble metalworking oil composition are compatible. be able to. The mass ratio [(B1) / (C)] or [(B2) / (C)] is more preferably 0.2 to 7.5, still more preferably 0.5 to 6.9, and particularly preferably 0.5 to 6.9. Is 1.0 to 6.9.

<Other component (D)>
The water-soluble metalworking oil composition of the present embodiment may further contain another component (D) as long as the object of the present embodiment is not impaired. For example, a surfactant, a lubricity improver, a metal deactivating agent, a defoaming agent, a bactericidal agent, a rust inhibitor, an antioxidant and the like can be blended.

(Surfactant)
Examples of the surfactant include nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants and the like. Examples of the nonionic surfactant include ethers such as polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkylene ether and polyoxyethylene alkyl phenyl ether, and amides such as fatty acid alkanolamide. Examples of the anionic surfactant include alkylbenzene sulfonates, alpha-olefin sulfonates and the like. Examples of the cationic surfactant include quaternary ammonium salts such as alkyltrimethylammonium salt, dialkyldimethylammonium salt and alkyldimethylbenzylammonium salt. Examples of the amphoteric tenside include alkyl betaine as a betaine system.

(Lubricability improver)
Examples of the lubricity improving agent include vegetable oils such as castor oil and rapeseed oil, fats and oils such as lanolin, and refined products thereof.

(Metal deactivating agent, antioxidant)
Examples of the metal inactivating agent include benzotriazole, imidazoline, pyrimidine derivative, thiadiazole, sodium phosphate salt, phosphate ester derivative and the like.
Examples of the antioxidant include amine-based antioxidants such as alkylated diphenylamine, phenyl-α-naphthylamine, and alkylated phenyl-α-naphthylamine; 2,6-di-t-butylphenol, 4,4'-methylenebis (2, 6-di-t-butylphenol), isooctyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, n-octadecyl-3- (3,5-di-t-butyl-4-) Phenolic antioxidants such as hydroxyphenyl) propionate; sulfur-based antioxidants such as dilauryl-3,3'-thiodipropionate; phosphorus-based antioxidants such as phosphite; and molybdenum-based antioxidants. Be done.

(Fungicide, defoamer, rust preventive)
Examples of the bactericidal agent include triazine-based preservatives, alkylbenzimidazole-based preservatives, isothiazoline-based preservatives, pyridine-based preservatives, phenol-based preservatives, and pyrithione-based preservatives.
Examples of the defoaming agent include silicone-based compounds and polyether-based compounds.
Examples of the rust preventive agent include decanedioic acid (sebacic acid) and neodecanoic acid.

The water-soluble metalworking oil composition of the present embodiment contains the above component (D) in an amount of preferably 0.1 to 16% by mass, more preferably 0.5 to 11% by mass, still more preferably 1 to 6% by mass. .. When a plurality of components are contained as the component (D), each component is independently contained in the above range.
When the content of the component (D) is 0.1% by mass or more, the effects of each component such as rust preventive property, bactericidal property and defoaming property are sufficiently exhibited. Further, by setting the content of the component (D) to 16% by mass or less, the stability of the undiluted solution of the water-soluble metalworking oil composition can be ensured.
The total content of the components (A) to (D) in the water-soluble metalworking oil composition of the present embodiment shall not exceed 100% by mass.
In one aspect of the present invention, the total content of the components (A), (B) and (C) is preferably 75 to 100% by mass based on the total amount (100% by mass) of the water-soluble metalworking oil composition. More preferably, it is 80 to 100% by mass.
In one embodiment of the present invention, the total content of the components (A), (B), (C) and (D) is preferably 90 to 90 based on the total amount (100% by mass) of the water-soluble metalworking oil composition. It is 100% by mass, more preferably 95 to 100% by mass.

<Metalworking liquid (diluted liquid)>
The metalworking liquid of the present embodiment is obtained by diluting the water-soluble metalworking oil composition (stock solution) of the present invention with water. The water here may be industrial water, tap water, well water, ion-exchanged water, distilled water, or the like, and is not particularly limited. In the present embodiment, it is preferable to dilute the water-soluble metalworking oil composition with water so that the dilution ratio is 2.5 to 50 times. When the dilution ratio is in the above range, the viscosity is appropriate, it is easy to handle, and there is little stickiness. Further, since the active ingredient such as the component (B1) or (B2) of the undiluted solution composition is sufficiently contained, the processing performance, for example, the grindability is excellent. The dilution ratio is more preferably 2.5 to 20 times, further preferably 5 to 10 times.

The water-soluble metalworking oil composition (stock solution) or metalworking solution (diluted solution) of the present embodiment can be suitably used for metalworking, for example, metal cutting and / or grinding, and preferably metal grinding. It is used as a grinding oil used in. The metal to be processed is not particularly limited, but preferably examples thereof include stainless steel, alloy steel, carbon steel, aluminum alloy, and copper alloy, and a particularly preferable effect can be obtained for stainless steel.

Next, the metal processing method of the present embodiment will be described.
<Metal processing method>
As a type of metal processing, it can be suitably used in various metal processing fields such as cutting, grinding, punching, polishing, drawing, drawing, rolling, etc., but it must be grinding. preferable. As the grinding process, for example, a method of grinding a metal with a grinding belt can be mentioned. The grinding belt is a polishing tool made of an endless belt in which an abrasive (abrasive grains) is adhered to the surface of a substrate made of cloth, paper, plastic, rubber, etc., and is usually used in grinding. It can be used by appropriately selecting the one. As the abrasive grains, for example, alumina can be used. The metal used as the work material in this method is as described above.
The water-soluble metalworking oil composition (stock solution) and metalworking liquid (diluted solution) of the present embodiment are suitable for so-called rough grinding because they have good grindability and can increase the amount of grinding. It can be used.
In the grinding process using a grinding belt, for example, as shown in FIG. 1, the work material 5 transported by the transport belt 4 or the like rotates around two or more rollers such as the idle roll 1 and the contact roll 2. Grinding belt 3 The surface is pressed against the surface. At this time, the water-soluble metalworking oil composition (stock solution) or metalworking liquid (diluting liquid) 6 of the present embodiment is supplied to the portion (grinding portion) of the work material 5 to which the belt is pressed. The water-soluble metalworking oil composition (stock solution) or metalworking liquid (diluted solution) of the present embodiment is supplied to the grinding section from an oil tank 7 provided below the transport belt 4, and is also supplied from the grinding section. The dropped material is returned to the tank 7 and supplied to the grinding unit while circulating.

Next, the present invention will be specifically described with reference to Examples, but the present invention is not limited to these examples.

<Each evaluation method>
(1) Evaluation of undiluted solution stability 80 ml of each water-soluble metalworking oil composition (undiluted solution) was placed in a 100 ml transparent glass bottle, and allowed to stand in a constant temperature bath at 0 ° C., 25 ° C. and 50 ° C. for 24 hours to observe the appearance. The stability of the undiluted solution was evaluated according to the following evaluation criteria.
(Evaluation criteria for undiluted solution stability)
-Pass: Separation, sedimentation / precipitation, and no solidification-Failure: Separation, sedimentation / precipitation, or solidification

(2) Evaluation of stability of diluted solution Each water-soluble metal processing oil composition (stock solution) was diluted to 5% by volume with magnesium-adjusted water (Mg-adjusted water) adjusted to contain 200 ppm of magnesium ions with water and magnesium chloride. The appearance of the metal processing liquid (diluted liquid) after 24 hours was observed. The stability of the diluted solution of the metalworking solution (diluted solution) was evaluated according to the following evaluation criteria.
(Evaluation criteria for diluent stability)
-Pass: No separation and non-uniformity-Failure: Separation or non-uniformization (3) Grinding performance Each water-soluble metalworking oil composition (stock solution) is diluted to 10% by volume with water to make a metalworking liquid. After making (diluted solution), the following metal processing was performed. Grindability was evaluated using the grinding test device shown in FIG. 1 as a schematic diagram. That is, in FIG. 1, the work material 5 placed on the transport belt 4 is pressed against the grinding belt 3 which rotates between the idle roll 1 and the contact roll 2, while the metal processing is performed on the grinding portion. Grinding is performed while circulating and supplying the liquid (diluting liquid) 6 from the oil tank 7. Five work material plates are used for each test, and the plates are passed continuously without any gaps. The evaluation items and test conditions are as follows.
(Evaluation item)
The test was performed for a total of 100 passes, and the grinding amount was evaluated. When the grinding amount is 500 g or more, it has excellent grinding performance equivalent to that of the water-insoluble metalworking oil composition.

(Test condition)
・ Grinding belt: Alumina No. 80 ・ Abrasive material: SUS304, width 90 mm × length 1,000 mm × thickness about 3 mm ・ 5 sheets per test ・ Speed: belt speed; 1400 m / min, plate feed speed; 10m / min
・ Polishing method: Downcut ・ Metal processing liquid (diluted liquid) temperature: 40 ℃
・ Load: 1.5hp / inch (belt pressing force is evaluated constantly)

Examples 1-8 and Comparative Examples 1-6
A water-soluble metalworking oil composition (stock solution) was prepared with the compounding materials and proportions shown in Tables 1 and 2, and various performances (grindability, stock solution stability and diluted solution stability) were evaluated as described above. The results are shown in Tables 1 and 2. The unit of each composition compounding amount is "mass%".

The compounding materials in Tables 1 and 2 are as follows.
<Compounding material>
(1) Base oil / naphthenic mineral oil (40 ° C kinematic viscosity: 27.77 mm ² / s, 100 ° C kinematic viscosity: 4.210 mm ² / s: measured in accordance with JIS K 2283: 2000)
(2) Carboxylic acid compound (B1)
-Ricinoleic acid dehydration condensate 1: Ricinoleic acid is heated and dehydrated and condensed at 200 ° C. under a nitrogen stream, and oleic acid is further added and heated and dehydrated and condensed. Acid value: 90 mgKOH / g, hydroxyl value: 15 mgKOH / g, saponification value 195 mgKOH / g.
-Ricinoleic acid dehydration condensate 2: A condensate obtained by heating and dehydrating ricinoleic acid at 200 ° C. under a nitrogen stream, acid value: 34 mgKOH / g, hydroxyl value: 28 mgKOH / g, saponification value: 198 mgKOH / g.
(B') Carboxylic acid: Tall oil fatty acid (3) Other components-Nonionic surfactant 1 (Polyoxyethylene polyoxypropylene alkylene ether, HLB: 13)

The water-soluble metalworking oil composition of the example was good in all of the grinding performance, the stock solution stability and the diluted solution stability.

According to this embodiment, even when it is used for metal processing of difficult-to-process materials such as stainless steel and the grinding amount is increased for the purpose of increasing productivity, the processing performance equivalent to that of water-insoluble metal processing oil is obtained. A water-soluble metalworking oil composition having is obtained. The water-soluble metalworking oil composition of the present embodiment and the metalworking liquid obtained by diluting the water-soluble metalworking oil composition with water can be suitably used for cutting or grinding, especially grinding using a grinding belt. can.

1: Idle roll, 2: Contact roll, 3: Grinding belt, 4: Conveyor belt, 5: Work material, 6: Water-soluble metalworking oil composition (stock solution) or metalworking liquid (diluted liquid), 7: Oil tank

Claims (12)

Base material (A) is 3.5 to 20% by mass,
A carboxylic acid dehydration condensation product (B1) obtained by dehydrating and condensing at least one type of carboxylic acid having 10 to 24 carbon atoms, or a mixture (B2) of the carboxylic acid dehydration condensation product (B1) and a carboxylic acid (B'). 34-76% by mass, and 9-39% by mass of amine (C)
A water-soluble metalworking oil composition containing
The substrate (A) is at least one selected from water and mineral oil having a kinematic viscosity of 1 to 27.77 mm ² / s at 40 ° C.
The carboxylic acid (B') is an unsaturated carboxylic acid having a total carbon number of 4 to 30.
Further, as a rust preventive, one or more selected from decanedioic acid and neodecanoic acid is contained.
Water-soluble metalworking oil composition. The water-soluble metalworking oil composition according to claim 1, wherein the carboxylic acid having 10 to 24 carbon atoms is ricinoleic acid. The water-soluble metalworking oil composition according to claim 1 or 2, wherein the acid value of the carboxylic acid dehydration condensate (B1) is 5 to 100 mgKOH / g. The water-soluble metalworking oil composition according to any one of claims 1 to 3, wherein the amine (C) contains an amine (C-1) having a hydroxyl group and an amine (C-2) having no hydroxyl group. thing. The mass ratio of the carboxylic acid dehydration condensation product (B1) or the mixture (B2) of the carboxylic acid dehydration condensation product (B1) and the carboxylic acid (B') to the substrate (A) [(B1) / (A). ] Or [(B2) / (A)] is 0.5 to 30, the water-soluble metal processing oil composition according to any one of claims 1 to 4. The water-soluble according to any one of claims 1 to 5, wherein the mass ratio [(C) / (A)] of the amine (C) and the base material (A) is 0.1 to 7.0. Metalworking oil composition. Mass ratio of carboxylic acid dehydration condensation (B1) or mixture (B1) of carboxylic acid dehydration condensation (B1) and carboxylic acid (B') to amine (C) [(B1) / (C)] or The water-soluble metal processing oil composition according to any one of claims 1 to 6, wherein [(B2) / (C)] is 0.1 to 8.0. The water-soluble metalworking oil composition according to any one of claims 1 to 7, which is a grinding oil used for grinding metal. The water-soluble metalworking oil composition according to any one of claims 1 to 8, which is used for processing stainless steel. A metalworking liquid obtained by diluting the water-soluble metalworking oil composition according to any one of claims 1 to 9 with water. A metal processing method for processing a metal using the water-soluble metal processing oil composition according to any one of claims 1 to 9 or the metal processing liquid according to claim 10. The metal processing method according to claim 11, wherein the metal is ground by a grinding belt.

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