Metalworking fluid composition

Abstract

To provide a metalworking oil agent composition excellent in lubricating properties (cutting properties), resistance to hard water, and stock solution stability.SOLUTION: A metalworking oil agent composition includes: (A) 0.1 to 3.5 mass% of primary alkanolamine having a carbon number of six or more, (B) 1.0 to 8.0 mass% of primary alkanolamine such as 2-(2-aminoethoxy)ethanol, (C) 1.5 to 9.0 mass% of tertiary amine having three alkanol groups, (D) 1.0 to 5.0 mass% of N-butyl monoethanolamine, (E) 0.3 to 4.0 mass% of dibasic acid having a carbon number of ten or more with a carboxylic acid group on both ends thereof, (F) 2.0 to 10.0 mass% of C12-22 linear fatty acid, (G) 5.0 to 15.0 mass% of castor fatty acid polycondensate, (H) 0.5 to 10.0 mass% of one or more branched alcohols having a carbon number of eleven or more, (I) 35.0 to 50.0 mass% of a paraffinic mineral oil, and (J) water.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a water-soluble metal working oil composition that can be widely applied to metal working such as cutting and grinding, as well as plastic working.

Background Art

[0002] Cutting oils widely used in the fields of cutting and grinding include water-insoluble cutting oils based on mineral oil, and water-soluble cutting oils containing mineral oil, surfactants, organic amines, etc., which are diluted with water before use. In the case of water-soluble cutting oils, in order to improve the anti-corruption performance of the oil, preservatives are added or amines with anti-corrosion effects are formulated. However, in recent years, in the context of global resource conservation and prevention of global environmental degradation, there has been a demand for the development of more environmentally friendly oils and oils that can withstand long-term use in cutting oils compared to the conventional ones.

[0003] Conventionally, water-soluble metalworking oils have included, for example, water-soluble cutting oil compositions using fatty acid alkanolamide ethylene oxide adducts, alkylamine ethylene oxide adducts, alicyclic amine ethylene oxide adducts, and fatty acid higher alcohol adducts (Patent Document 1), water-soluble grinding oil compositions using benzene compounds and parahydroxybenzoic acid ester compounds (Patent Document 2), compositions containing primary alkanolamines, carboxylic acids having 6 to 24 carbon atoms, and specific alkylenediamines (Patent Document 3), and water-soluble metalworking oils using aromatic amines or alicyclic amines (Patent Document 4) Examples include water-soluble cutting and grinding fluids using primary, secondary, and tertiary alkylamines, aromatic diamine oxyalkylene adducts, alicyclic diamine oxyalkylene adducts, etc. (Patent Document 5), water-soluble metalworking fluid compositions using unsaturated fatty acids and heterocyclic compounds (Patent Document 6), metalworking fluid compositions and metalworking methods using amines having alkyl groups with 4 or more carbon atoms and amines having cyclocyclic or benzene rings (Patent Document 7), antibacterial water-soluble cutting fluids using alkylenediamines (Patent Document 8), and metalworking fluids using amino alcohols as biocides (Patent Document 9).

[0004] However, while these water-soluble metalworking fluids are effective against general bacteria, they are not sufficiently effective against mold and yeast. Furthermore, those that are effective use halogen-containing compounds, polycyclic aromatic compounds, phenolic compounds, or metal salts, some of which are PRTR-listed substances, raising concerns about their effects on human health.

[0005] Preservatives, specifically amines, were essential compounds for improving the spoilage resistance of oils.

[0006] On the other hand, as means of improving machinability, for example, as a method to improve lubrication, there are known examples such as a hot rolling oil and hot rolling method using a specific palm olein oil (Patent Document 10), a metalworking fluid composition in which the acid value and amine value of all constituent components are set in a specific ratio, a processing method using the same, and metalworking parts manufactured by the metalworking method (Patent Document 11).

[0007] However, while these water-soluble metalworking fluids are effective in general cutting operations, they do not meet the cutting performance requirements for heavy-duty cutting operations. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Special Publication No. 6-31388 [Patent Document 2] Special Publication No. 7-37632 [Patent Document 3] Special Publication No. 6-76590 [Patent Document 4] Patent No. 2510233 [Patent Document 5] Japanese Patent Application Publication No. 9-316482 [Patent Document 6] Patent No. 4836341 [Patent Document 7] Patent No. 5255835 [Patent Document 8] Patent No. 5204390 [Patent Document 9] Patent No. 5670882 [Patent Document 10] Patent No. 3320642 [Patent Document 11] Patent No. 6355339 [Overview of the project] [Problems that the invention aims to solve]

[0009] The present invention aims to provide a metalworking fluid composition that exhibits excellent lubricity (cutting ability), resistance to hard water, and stability of the undiluted solution. [Means for solving the problem]

[0010] According to the present inventors, this objective can be achieved by using a specific amine, a specific fatty acid, a specific alcohol, and a specific mineral oil in a specific ratio. That is, the present invention provides the following metalworking fluid composition, metalworking fluid, and metalworking method: 1. (A) 0.1 to 3.5% by mass of at least one primary alkanolamine having 6 or more carbon atoms, (B) 1.0 to 8.0% by mass of at least one primary alkanolamine selected from the group consisting of 2-(2-aminoethoxy)ethanol, 2-amino-2-methyl-1-propanol, monoisopropanolamine, and monoethanolamine, (C) 1.5 to 9.0% by mass of a tertiary amine having at least one type of three alkanol groups, (D)N-butylmonoethanolamine in a concentration of 1.0 to 5.0% by mass, (E) 0.3 to 4.0% by mass of at least one dibasic acid having carboxylic acid groups at both ends with 10 or more carbon atoms, (F) 2.0 to 10.0% by mass of straight-chain fatty acids with 12 to 22 carbon atoms, (G) Castor fatty acid polycondensate in a mass of 5.0-15.0%, (H) 0.5 to 10.0% by mass of at least one branched alcohol having 11 or more carbon atoms, (I) Paraffinic mineral oil in a quantity of 35.0-50.0% by mass, (J)Water A metalworking fluid composition characterized by containing [a specific ingredient / material]. 2. The metalworking fluid composition according to paragraph 1, wherein component (A) is one or two selected from the group consisting of aminohexanol, aminooctanol, aminodecanol, and aminododecanol. 3. The metalworking fluid composition according to 1 or 2 above, wherein component (C) is one or two selected from the group consisting of triethanolamine, triisopropanolamine, monoethanoldiisopropanolamine, and diethanolmonoisopropanolamine. 4. The metalworking oil composition according to any one of 1 to 3 above, wherein the (E) component is at least one selected from the group consisting of sebacic acid, undecanedioic acid, and dodecanedioic acid. 5. The metalworking oil composition according to any one of 1 to 4 above, wherein the (F) component is at least one selected from the group consisting of lauric acid, oleic acid, ricinoleic acid, and erucic acid. 6. The metalworking oil composition according to any one of 1 to 5 above, wherein the (G) component is a polycondensate of ricinoleic acid having an acid value of 30 to 100 mgKOH / g. 7. The metalworking oil composition according to any one of 1 to 6 above, wherein the (H) component is at least one branched alcohol having 13 to 26 or more carbon atoms. 8. A metalworking oil obtained by diluting the metalworking oil composition according to any one of 1 to 7 above with water. 9. A metalworking method comprising using the metalworking oil composition according to any one of 1 to 7 above or the metalworking oil according to 8 above.

Advantages of the Invention

[0011] According to the present invention, it is possible to provide a metalworking oil composition excellent in lubricity (cutting property), water hardness resistance, and undiluted solution stability. The composition of the present invention is also excellent in emulsion stability (stability of diluted solution), non-ferrous corrosion resistance, and waste liquid disposability.

Embodiments for Carrying Out the Invention

[0012] Component (A) is at least one primary alkanolamine having 6 or more carbon atoms. Component (A) contributes to the stability of the undiluted solution. Examples of the primary alkanolamine (A) include aminohexanol, aminooctanol, and aminododecanol. These may be used alone or in combination of two or more. Among these, aminohexanol and aminooctanol are preferable, and 3-amino-4-octanol is particularly preferable.

[0013] The content of component (A) is preferably 0.1 to 3.5% by mass, and more preferably 0.5 to 1.0% by mass, based on the total mass of the composition. A content of 0.1 to 3.5% by mass ensures sufficient stability of the stock solution.

[0014] Component (B) is at least one primary alkanolamine selected from the group consisting of 2-(2-aminoethoxy)ethanol, 2-amino-2-methyl-1-propanol, monoisopropanolamine, and monoethanolamine. Of these, 2-(2-aminoethoxyethanol) is particularly preferred. The content of component (B) is preferably 1.0 to 8.0% by mass, and more preferably 2 to 6% by mass, based on the total mass of the composition. If it is 1.0% by mass or more, good emulsification stability and hard water resistance can be achieved. If it is 8.0% by mass or less, good non-ferrous corrosion resistance can be maintained and cutting performance can be sufficiently improved.

[0015] The tertiary amine having at least one of three alkanol groups in component (C) is preferably at least one selected from the group consisting of triethanolamine, triisopropanolamine, and diethanolmonoisopropanolamine. Triethanolamine and triisopropanolamine are preferred. The content of component (C) is 1.5 to 9.0% by mass, preferably 3.0 to 6.0% by mass, based on the total mass of the composition. A content of (C) of 1.5 to 9.0% by mass ensures good emulsification stability, resistance to hard water, and stability of the undiluted solution. The content of (D)N-butylmonoethanolamine is 1.0 to 5.0% by mass, preferably 1.5 to 4.0% by mass. If it is 1.0% by mass or more, sufficient stock solution stability and emulsion stability can be achieved. If it is 5.0% by mass or less, good resistance to hard water can be achieved. The total amount of component (C) and component (D) is preferably 4.0 to 12.0% by mass, and more preferably 5.0 to 10.0% by mass, based on the total mass of the composition of the present invention. By including component (C) and component (D) within this range, good resistance to hard water, emulsification stability, and good stock solution stability can be maintained.

[0016] Examples of dibasic acids in component (E) that have carboxylic acid groups at both ends and at least one carbon atom of 10 or more include sebacic acid, undecanediic acid, dodecanediic acid, tridecanediic acid, tetradecanediic acid, pentadecanediic acid, and hexadecanedioic acid. These may be used individually or in combination of two or more. Of these, sebacic acid and dodecanediic acid are preferred. Component (E) contributes particularly to rust prevention.

[0017] Examples of linear fatty acids with 12 to 22 carbon atoms in component (F) include linear lauric acid, myristic acid, pentadecyl acid, palmitic acid, stearic acid, arachidonic acid, behenic acid, palmitoleic acid, margaric acid, vaccenic acid, oleic acid, linoleic acid, linolenic acid, eleostearic acid, eicosadienoic acid, meadic acid, erucic acid, elaidic acid, arachidonic acid, 12-hydroxystearic acid, and ricinoleic acid. These may be used individually or in combination of two or more. Of these, oleic acid, ricinoleic acid, and erucic acid are preferred, and ricinoleic acid and erucic acid are more preferred.

[0018] The content of component (F) is preferably 2.0 to 10.0% by mass, and more preferably 3 to 8% by mass, based on the total mass of the composition. A content of 2.0 to 10.0% by mass allows for good resistance to hard water.

[0019] The castor fatty acid polycondensate of component (G) preferably has an acid value of 30 to 100 mgKOH / g, and more preferably 30 to 50 mgKOH / g. The content of component (G) is preferably 3.0 to 15.0% by mass, and more preferably 5.0 to 15.0% by mass, based on the total mass of the composition. When included within this range, the emulsification of the diluted solution and the stability of the stock solution are excellent.

[0020] Of the branched alcohols of component (H), those with 11 or more carbon atoms are preferred, and those with 13 to 26 carbon atoms are preferred. Component (H) contributes particularly to the stability of the stock solution at low temperatures. Examples of component (H) include branched alcohols such as undecanol, lauryl alcohol, tridecanol, tetradecanol, pentadecanol, myristyl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, linolyl alcohol, eicosanol, henicosanol, tetracosanol, and triacontanol. Of these, isotridecanol, isotetradecanol, isopentadecanol, isotetracosanol, or mixtures thereof are preferred, and a mixture of isotetradecanol and isopentadecanol is more preferred. The content of component (H) is preferably 0.5 to 10.0% by mass, and more preferably 1.0 to 5.0% by mass, based on the total mass of the composition. Within this range, a satisfactory level of stock solution stability can be achieved.

[0021] Component (I) is a paraffinic mineral oil. Component (I) contributes particularly to lubrication. Component (I) has a kinematic viscosity of 8-60 mmHg at 40°C. 2 A paraffinic mineral oil with a viscosity of / s is preferred. In this specification, the kinematic viscosity can be measured according to JIS K 2283.

[0022] The content of component (I) is 35.0 to 50.0% by mass, preferably 40.0 to 45.0% by mass, based on the total mass of the composition. If it is 35.0% by mass or more, good lubricity can be achieved. If it is 50.0% by mass or less, good emulsion stability of the diluent can be achieved.

[0023] Component (J) is water. Component (J) contributes to the stability of the stock solution. The content of component (J) is the remainder of the composition, and specifically, it is preferably 3.0 to 35.0% by mass, and more preferably 15.0 to 25.0% by mass.

[0024] The metalworking fluid composition of the present invention may also contain, in addition to component (F), 0.3 to 2.0% by mass of isostearic acid and 0.5 to 3.0% by mass of neodecanoic acid. The inclusion of these components is preferable because it moderately suppresses foaming during use. The metalworking fluid composition of the present invention may contain 0.5 to 3.0% by mass of 5(or 6)-carboxy-4-hexyl-2-cyclohexaneoctanoic acid (e.g., "DIACID1550" manufactured by Ingevity). The inclusion of this component is preferable because it improves the emulsification stability of the diluted solution and the rust-preventive properties during use.

[0025] The metalworking fluid composition of the present invention optionally contains a lubricating oil as a lubricating aid. Examples of lubricating aids include synthetic ester oils, polyol esters, alkylbenzenes, natural oils and fats, polyglycols, poly-α-olefins, etc. These may be used individually or as a blend of multiple oils. Preferably, synthetic ester oils and natural oils and fats are used. As synthetic ester oils, 2-ethylhexyl palmitate, 2-ethylhexyl stearate, or 2-ethylhexyl oleate are preferred.

[0026] The lubricating oil content as a lubricating aid is preferably 3 to 20% by mass, and more preferably 5 to 15% by mass, based on the total mass of the metalworking fluid composition of the present invention. Excellent lubrication is achieved when the lubricating oil is included within this range.

[0027] The metalworking fluid composition of the present invention may optionally contain a surfactant. The surfactant may be, for example, an anionic surfactant, a cationic surfactant, a nonionic surfactant, or an amphoteric surfactant. Anionic surfactants and nonionic surfactants are preferred. As anionic surfactants, ether carboxylic acids such as lauryl ether carboxylic acid, obtained by adding acetic acid to the terminal end of a lauryl alcohol EO adduct, and oleyl ether carboxylic acid, obtained by adding acetic acid to the terminal end of an oleyl alcohol EO adduct, are preferred. The number of EO adduct moles of the ether carboxylic acid is preferably 2 to 10. Nonionic surfactants with an HLB of 4 to 14, as represented by Griffin's formula, are preferred. Examples include polyoxyalkylene alkyl (alkenyl) ethers (weight-average molecular weight of approximately 700 to 2000), such as polyoxypropylene monobutyl ether and polyoxyethylene oleyl ether; alkylene oxide adducts of higher amines, such as laurylamine EO adducts and cocoamine EO adducts; and alkylene oxide adducts of higher alcohols, such as C12-14 alcohol EO and PO adducts. Surfactants may be used alone or in combination of two or more types. The surfactant content is preferably 0.2 to 5% by mass, and more preferably 0.5 to 2% by mass, based on the total mass of the composition. When included within this range, the emulsification stability of the diluted solution and the stability of the stock solution are excellent.

[0028] The metalworking fluid composition of the present invention may optionally contain fatty acids such as lauryl succinic acid and stearyl succinic acid, sulfonates such as sodium petroleum sulfonate, and carboxylic acid amides as rust inhibitors. The rust inhibitor content is preferably 0 to 20% by mass, and more preferably 1 to 10% by mass, based on the total mass of the composition.

[0029] Furthermore, the metalworking fluid composition of the present invention may optionally contain a silicone-based defoaming agent, an alcohol-based defoaming agent, a benzotriazole-based metal corrosion inhibitor, and the like. The content of the defoaming agent and the metal corrosion inhibitor is preferably 0.05 to 2% by mass, and more preferably 0.1 to 1% by mass, based on the total mass of the composition.

[0030] Furthermore, the metalworking fluid composition of the present invention may optionally contain preservatives such as benzoisothiazolin-3-one, 1,2-benzoisothiazolin-3-one, butylbenzoisothiazolin-3-one, and metal pyrithione salts (e.g., sodium omazine, zinc pyrithione), as well as alkylamines such as laurylamine and oleylamine as preservatives or antimicrobial agents. The content of preservatives or antimicrobial agents is preferably 0.1 to 5% by mass, and more preferably 0.2 to 2% by mass, based on the total mass of the composition.

[0031] The pH (25°C) of the metalworking fluid composition of the present invention is preferably 7.0 to 11, and more preferably 8.5 to 11, in a solution obtained by diluting the stock solution with pure water to 5% by mass. A pH of 7.0 or higher provides satisfactory preservative properties. A pH of 11 or lower keeps skin irritation low. As pH adjusters, amines other than components (A) to (D), such as amines having alicyclic groups like dicyclohexylamine, 1,3-bisaminocyclohexane, and cyclohexylpropyldiamine, or their EO adducts, amines having aromatic cyclic groups like metaxylenediamine, or acids such as lactic acid, malic acid, maleic acid, succinic acid, tartaric acid, citric acid, and boric acid can be used. The metalworking fluid composition of the present invention is generally used after being diluted with water to a concentration of 0.5% by mass or higher.

[0032] Compositions for the examples and comparative examples were prepared with the compositions shown in Table 1 (units are in mass%).

[0033] <Evaluation Method> (1) Stock solution stability The composition of the example or comparative example is placed in a candle bottle and left to stand for 168 hours in a constant temperature bath at -5°C, 25°C, and 50°C, and the state of the undiluted solution upon removal is observed. Judgment criteria: If there are no changes in appearance such as separation or solidification, it will be considered a success.

[0034] (2) Emulsification stability (stability of the diluent) The composition of the example or comparative example is diluted in pure water to a concentration of 5% by mass, and 100 mL is placed in a stoppered graduated cylinder. The change in appearance is observed after 1 day at 25°C. Judging criteria: If there are no emulsification defects, it will be considered a pass.

[0035] (3) Lubricity (cutting properties) Using the workpiece material described below, M6 tapping was performed under the following conditions, and the cutting resistance experienced during machining was measured. Workpiece tool: New Roll Tap (OSG B-NRT RH7 M6×1.0) Workpiece material: Aluminum alloy (AC8B-T6, 300 x 200 x 30 mm) Cutting speed: 10m / min Pilot hole: 5.48mm, reamed, blind hole Cutting length: 20mm Concentration: Dilute the undiluted solution with water to 5% by mass. N: 5 Test oil: The composition of the example or comparative example diluted with water to 5% by mass. Fueling rate: 6 liters / minute of test oil. Evaluation method: Measure the cutting resistance (torque [N·m]). Judgment criteria: A cutting torque of 2.9 N·m or less is considered acceptable.

[0036] (4) Non-ferrous corrosion protection test The composition of the example or comparative example was diluted to 5% by mass in JIS hard water, which was diluted 10 times with pure water, and placed in a mayonnaise bottle. An aluminum test piece (A1050) whose surface had been polished with #240 carborundum was then immersed in the diluted solution. The bottle was sealed tightly, and the change in the appearance of the test piece was observed after 2 days at 25°C. Judging criteria: The test piece will pass if there is no significant discoloration.

[0037] (5) Hard water resistance First, prepare water by dissolving calcium chloride dihydrate in pure water to a calcium concentration of 100 ppm. Dilute the composition of the example or comparative example in this water to 5% by mass, place it in a mayonnaise bottle, seal it, and observe the change in appearance after 1 day at 25°C. Judgment criteria: If there is no significant scum formation or oil separation, it will be considered acceptable.

[0038] (6) Wastewater treatment capabilities The composition of the example or comparative example is diluted to 5% by weight with pure water, aluminum sulfate and sulfuric acid are added to adjust the pH to 3.0, and acid decomposition is carried out. Then, the solution is neutralized with an aqueous sodium hydroxide solution, and a polymer flocculant is added to floccate the floating flocs. After that, the solution is filtered through 5C filter paper, and the appearance of the filtrate is checked. Judging criteria: If the exterior is transparent, it will pass. The results are shown in Tables 1 and 2.

[0039] [Table 1]

[0040] [Table 2]

Claims

1. (A) 0.1 to 3.5% by mass of at least one primary alkanolamine having 6 or more carbon atoms, (B) 1.0 to 8.0% by mass of at least one primary alkanolamine selected from the group consisting of 2-(2-aminoethoxy)ethanol, 2-amino-2-methyl-1-propanol, monoisopropanolamine, and monoethanolamine, (C) 1.5 to 9.0% by mass of a tertiary amine having at least one type of three alkanol groups, (D) N-butylmonoethanolamine in a concentration of 1.0 to 5.0% by mass, (E) 0.3 to 4.0% by mass of a dibasic acid having carboxylic acid groups at both ends and at least one carbon atom, (F) 2.0 to 10.0% by mass of straight-chain fatty acids with 12 to 22 carbon atoms, (G) Castor fatty acid polycondensate in an amount of 5.0 to 15.0% by mass, (H) 0.5 to 10.0% by mass of at least one branched alcohol having 11 or more carbon atoms, (I) Paraffinic mineral oil in a quantity of 35.0 to 50.0% by mass, (J) Water A metalworking fluid composition characterized by containing [a specific ingredient / material].

2. (A) The metalworking fluid composition according to claim 1, wherein component (A) is one or two selected from the group consisting of aminohexanol, aminooctanol, aminodecanol, and aminododecanol.

3. The metalworking fluid composition according to claim 1 or 2, wherein component (C) is one or two selected from the group consisting of triethanolamine, triisopropanolamine, monoethanoldiisopropanolamine, and diethanolmonoisopropanolamine.

4. The metalworking fluid composition according to any one of claims 1 to 3, wherein component (E) is at least one selected from the group consisting of sebaciic acid, undecanediic acid, and dodecanediic acid.

5. The metalworking fluid composition according to any one of claims 1 to 4, wherein component (F) is at least one selected from the group consisting of lauric acid, oleic acid, ricinoleic acid, and erucic acid.

6. The metalworking fluid composition according to any one of claims 1 to 5, wherein component (G) is a ricinoleic acid polycondensate having an acid value of 30 to 100 mg KOH / g.

7. The metalworking fluid composition according to any one of claims 1 to 6, wherein component (H) is at least one branched alcohol having 13 to 26 carbon atoms.

8. A metalworking fluid obtained by diluting the metalworking fluid composition according to any one of claims 1 to 7 with water.

9. A metalworking method comprising using a metalworking fluid composition according to any one of claims 1 to 7 or a metalworking fluid according to claim 8.

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