Metalworking lubricant composition

Abstract

To provide a metalworking lubricant composition that can further suppress deterioration of a working environment due to putrid odors over a long period of time, contributes to improvement of the working environment and surrounding environment, and provides a coolant exhibiting an excellent lubrication property.SOLUTION: A metalworking lubricant composition of the present invention contains (A) a base oil, (B) a compound represented by the following general formula (1) and (C) a base.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a metalworking lubricant composition which, when diluted with water, provides a working fluid suitable for cutting, grinding, etc. of metals. [Background technology]

[0002] Water-soluble metalworking fluids used in metalworking processes such as cutting, grinding, and plastic working are manufactured by appropriately mixing mineral oils, synthetic lubricants, fatty acids, amines, extreme-pressure additives, surfactants, antifoaming agents, metal corrosion inhibitors, antioxidants, and antiseptic and antifungal agents according to the intended purpose. Water-soluble metalworking fluids are usually diluted with a diluent such as water before use. This diluted water-soluble metalworking fluid is called a coolant.

[0003] Coolant is required to have primary performance related to cutting and grinding, and secondary performance related to workability. Primary performance includes improving the accuracy of the finished surface and extending the tool life. Secondary performance includes being resistant to deterioration and easy to manage, and even if it does deteriorate, it does not emit a bad odor, which puts less strain on the operator.

[0004] Water-soluble metalworking fluids and coolants contain many components that serve as nutrient sources for microorganisms, such as live bacteria, yeast, and filamentous fungi. When coolants are used, microorganisms are typically introduced from the air and multiply, resulting in the decay of the coolant. As decay progresses, microbial metabolites produce foul odors, and the primary performance deteriorates due to the decomposition of components by the microorganisms. To prevent this deterioration, coolants are regularly replaced or replenished. However, frequent replacement or replenishment of coolants can be costly and costly. Therefore, preventing microbial degradation of coolants is important. Antimicrobial amines or thiazoline-based antiseptic and antibacterial components are typically added to these coolants to prevent corrosion. However, these antiseptic and antibacterial components often require a high pH to function or have other adverse effects, such as being highly irritating to the skin. Furthermore, the use of amine-based substances, which exhibit antiseptic and antibacterial properties at high pH levels, can discolor nonferrous metals (especially aluminum). Furthermore, even when these antiseptic measures are taken, it is difficult to completely prevent the growth of microorganisms in the coolant (including those scattered or attached as mist) when the coolant is recycled, and it is difficult to avoid the generation of putrid or unpleasant odors that are accentuated by the biodegradation products and intermediates of organic substances such as amine compounds and surfactants contained in the coolant, or by the mixture of these with the coolant components.

[0005] Furthermore, as mentioned above, coolants are required to have primary performance, and one indicator of this is improved lubricity. This improved lubricity is expected to improve the finished surface roughness and extend the tool life. For this reason, the use of α-olefins and fullerenes has been disclosed as a method for improving lubricity (see Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6051026 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-173814 Summary of the Invention [Problem to be solved by the invention]

[0007] Generally, preservatives have the problem of decomposing or inactivating within a short period of time, significantly reducing their effectiveness. Furthermore, the use of antibacterial amines inevitably leads to dangerously high pH levels. Furthermore, adding large amounts of such preservative and antiseptic ingredients can cause severe skin irritation and other irritating effects on the human body. The use of highly irritating coolants can adversely affect the health of workers and others. Meanwhile, the foul odors and putrid smells that accompany coolant decay can worsen not only the working environment but also the surrounding living environment, resulting in reduced productivity of processed products. Furthermore, depending on the decay prevention measures chosen, lubricity may be impaired, resulting in a decline in primary performance.

[0008] The object of the present invention is to provide a lubricant composition for metalworking that contains a benzotriazole, which can further suppress deterioration of the working environment due to putrid odors over a long period of time, contributes to improving the working environment and surrounding environment, and provides a coolant that exhibits excellent lubrication properties. [Means for solving the problem]

[0009] The present inventors have discovered that, in an aqueous metalworking lubricant composition containing a base oil, benzotriazoles, and a base, when the content ratio of benzotriazoles relative to the composition, the content ratio of base relative to benzotriazoles, and the pH of the composition when diluted are each set within a specific range, a coolant can be obtained that maintains good metalworking properties while further suppressing deterioration of the working environment due to putrid odors over a long period of time.

[0010] The present invention is illustrated below. 1. (A) base oil; (B) a compound represented by the following general formula (1): [ka] [In the formula, R 1 is a hydrogen atom, a hydrocarbon group, a hydroxy group, a nitro group, or a carboxy group, and R 2 is a hydrogen atom or a hydrocarbon group, and R 3 is a hydrogen atom or an organic group represented by the following general formula (2): -(CH2) n -N(R 4 )2(2) (In the formula, each R 4 are the same or different, substituted or unsubstituted hydrocarbon groups, and n is an integer. It is. and (C) Base A metalworking lubricant composition comprising: The content of the compound (B) is 2.5 to 18 mass% based on the total mass of the metalworking lubricant composition, the content of the base (C) is 90 to 750 parts by mass relative to 100 parts by mass of the compound (B), A metalworking lubricant composition characterized in that the pH of the metalworking lubricant composition when diluted 20 times with water at 25°C is 7.0 or more and less than 9.0. 2. The lubricant composition for metalworking according to item 1, wherein the base (C) is at least one selected from metal hydroxides and amines. 3. A lubricant composition for metalworking according to item 1, wherein the content of the base oil (A) is 10 to 70 mass % based on the total mass of the composition. [Effects of the Invention]

[0011] The metalworking lubricant composition of the present invention can be used to obtain a coolant that can maintain good metalworking properties and further suppress the deterioration of the working environment and the health hazards to workers caused by putrid odors for a long period of time.Therefore, when the coolant is circulated and used in cutting, grinding, plastic working, etc. to produce a large amount of processed products, high productivity can be achieved. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention will be described in detail below. The metalworking lubricant composition of the present invention contains a base oil (A), a compound (B), and a base (C), as described above, wherein the content of compound (B) is 2.5 to 18 mass% of the total composition, the content of base (C) is 90 to 750 mass parts per 100 mass parts of compound (B), and the pH of the composition at 25°C when diluted 20 times with water is 7.0 or more and less than 9.0. The metalworking lubricant composition of the present invention can contain other components (described below) in addition to the above, as necessary.

[0013] The base oil (A) is not particularly limited as long as it is a conventionally known oil used in cutting, grinding, etc. of inorganic materials, and examples thereof include mineral oils, animal and vegetable oils, synthetic oils, extreme pressure additives, etc. The base oil (A) contained in the metalworking lubricant composition of the present invention may be one type or two or more types.

[0014] The mineral oil is an oil obtained by distilling and refining petroleum, and may be a hydrogenated product, a modified oil, etc. Examples of the mineral oil include spindle oil and machine oil.

[0015] Examples of the animal and vegetable oils include animal fats and oils such as lard, beef tallow, and fish oil, and hydrogenated products thereof, and vegetable fats and oils such as rapeseed oil, soybean oil, and palm oil.

[0016] Examples of the synthetic oil include ester-based synthetic oils and hydrocarbon-based synthetic oils. The ester-based synthetic oil is preferably an ester composed of a carboxylic acid having a hydrocarbon group with 8 to 30 carbon atoms and an alcohol having 1 to 30 carbon atoms, and may be, for example, at least one selected from methyl oleate, 2-ethylhexyl oleate, neopentyl glycol dioleate, oleyl oleate, neopentyl glycol dicaprylate, trimethylolpropane tricaprylate, trimethylolpropane trioleate, glyceride tricaprylate, glyceride trioleate, pentaerythritol tetracaprylate, pentaerythritol tetraoleate, pentaerythritol dioleate, etc. Examples of the hydrocarbon-based synthetic oil include polyalphaolefin, isoparaffin, polybutene, GTL, and polyoxyalkylene glycol.

[0017] Examples of the extreme pressure additive include sulfur-based extreme pressure agents and phosphorus-based extreme pressure agents. Examples of sulfur-based extreme pressure agents include sulfurized olefins, sulfurized fats and oils, sulfurized esters, polysulfides, thiocarbamates, and dithiocarbamates. Examples of phosphorus-based extreme pressure agents include zinc dithiophosphate, phosphites, phosphates, acid phosphates, and phosphonates.

[0018] The kinematic viscosity (according to JIS K 2283, 40°C) of the base oil (A) is preferably 300 mm 2 / sec or less, preferably 250mm 2 / sec or less, more preferably 200mm 2 / sec or less. The lower limit is usually 3 mm 2 / sec, preferably 5mm 2 / seconds.

[0019] The content of the base oil (A) in the metalworking lubricant composition of the present invention is not particularly limited, and is usually 10 mass % or more, preferably 10 to 80 mass %, more preferably 20 to 80 mass %, and even more preferably 20 to 70 mass %, based on the total mass of the composition.

[0020] The compound (B) is a compound represented by the following general formula (1): The compound (B) contained in the metalworking lubricant composition of the present invention may be one type or two or more types. [ka] [In the formula, R 1 is a hydrogen atom, a hydrocarbon group, a hydroxy group, a nitro group, or a carboxy group, and R 2 is a hydrogen atom or a hydrocarbon group, and R 3 is a hydrogen atom or an organic group represented by the following general formula (2): -(CH2) n -N(R 4 )2(2) (In the formula, each R 4 are the same or different, substituted or unsubstituted hydrocarbon groups, and n is an integer. It is.

[0021] In the above general formula (1), R 1 is a hydrogen atom, a hydrocarbon group, a hydroxy group, a nitro group, or a carboxy group. The hydrocarbon group may be any of an aliphatic hydrocarbon group (having 1 or more carbon atoms, preferably 1 to 6 carbon atoms), an alicyclic hydrocarbon group (having 3 or more carbon atoms, preferably 3 to 6 carbon atoms), and an aromatic hydrocarbon group (having 6 or more carbon atoms, preferably 6 to 12 carbon atoms), but is preferably an aliphatic hydrocarbon group.

[0022] In the above general formula (1), R 2 is a hydrogen atom or a hydrocarbon group. The hydrocarbon group may be any of an aliphatic hydrocarbon group (having 1 or more carbon atoms, preferably 1 to 5 carbon atoms), an alicyclic hydrocarbon group (having 3 or more carbon atoms, preferably 3 to 6 carbon atoms), and an aromatic hydrocarbon group (having 6 or more carbon atoms, preferably 6 to 12 carbon atoms), but is preferably an aliphatic hydrocarbon group.

[0023] In the above general formula (1), R 3 is a hydrogen atom or an organic group represented by the general formula (2). In the organic group represented by the general formula (2), two R 4are the same or different and are hydrogen atoms or hydrocarbon groups. The term "substituted hydrocarbon group" refers to a hydrocarbon group in which at least one hydrogen atom has been substituted with a halogen atom or another functional group. The hydrocarbon group may be an aliphatic hydrocarbon group (having one or more carbon atoms, preferably 1 to 10), an alicyclic hydrocarbon group (having three or more carbon atoms, preferably 3 to 6), or an aromatic hydrocarbon group (having six or more carbon atoms, preferably 6 to 12), but is preferably an aliphatic hydrocarbon group.

[0024] In the above general formula (2), R 4 When the hydrocarbon group is a substituted hydrocarbon group, the hydrocarbon group may be any of an aliphatic hydrocarbon group (having 1 or more carbon atoms, preferably 1 to 15 carbon atoms), an alicyclic hydrocarbon group (having 3 or more carbon atoms, preferably 3 to 6 carbon atoms), and an aromatic hydrocarbon group (having 6 or more carbon atoms, preferably 6 to 12 carbon atoms), but is preferably an aliphatic hydrocarbon group, etc. Also, R 4 When the hydrocarbon group is an unsubstituted hydrocarbon group, the hydrocarbon group may be any of an aliphatic hydrocarbon group (having 1 or more carbon atoms, preferably 1 to 10 carbon atoms), an alicyclic hydrocarbon group (having 3 or more carbon atoms, preferably 3 to 6 carbon atoms), and an aromatic hydrocarbon group (having 6 or more carbon atoms, preferably 6 to 12 carbon atoms), but is preferably an aliphatic hydrocarbon group, etc.

[0025] Examples of the compound (B) include 1,2,3-benzotriazole, tolyltriazole (such as 5-methyl-1H-benzotriazole), carboxybenzotriazole, 5,6-dimethyl-1,2,3-benzotriazole, 1-aminobenzotriazole, nitro-1H-benzotriazole, 1-methyl-1H-benzotriazole, 2,2'-[[(methyl-1H-benzotriazol-1-yl)methyl]imino]bisethanol, 1-[N,N-bis(2-ethylhexyl)aminomethyl]benzotriazole, and 1-[N,N-bis(2-ethylhexyl)aminomethyl]methylbenzotriazole.

[0026] The content of compound (B) in the metalworking lubricant composition of the present invention is 2.5 to 18 mass %, preferably 3 to 18 mass %, based on the total mass of the composition. If the content of compound (B) exceeds 18 mass %, the coolant will separate.

[0027] The base (C) is not particularly limited and may be either an inorganic base or an organic base, or a combination thereof. The base (C) contained in the metalworking lubricant composition of the present invention may be one type or two or more types.

[0028] Examples of the inorganic base include hydroxides, carbonates, hydrogencarbonates, phosphates, hydrogenphosphates, oxides, and ammonia. Examples of hydroxides include metal hydroxides such as lithium hydroxide, sodium hydroxide, potassium hydroxide, rubidium hydroxide, cesium hydroxide, magnesium hydroxide, calcium hydroxide, barium hydroxide, copper hydroxide, iron hydroxide, zinc hydroxide, and aluminum hydroxide; and ammonium hydroxide. Examples of carbonates include lithium carbonate, sodium carbonate, potassium carbonate, calcium carbonate, magnesium carbonate, barium carbonate, strontium carbonate, and ammonium carbonate. Examples of hydrogen carbonates include sodium hydrogen carbonate, potassium hydrogen carbonate, and ammonium hydrogen carbonate. Examples of phosphates include sodium phosphate, potassium phosphate, and calcium phosphate. Examples of hydrogen phosphates include sodium hydrogen phosphate, potassium hydrogen phosphate, and calcium hydrogen phosphate. Examples of oxides include sodium oxide, magnesium oxide, and calcium oxide.

[0029] The inorganic base is preferably a hydroxide, and particularly preferably an alkali metal hydroxide.

[0030] Examples of the organic base include amines, alkanolamines, alkylammonium hydroxides, and alkylphosphonium hydroxides.

[0031] Examples of the amine include aliphatic amines, alicyclic amines, aromatic amines, and heterocyclic amines. Examples of aliphatic amines include methylamine, dimethylamine, trimethylamine, triethylamine, ethylenediamine, diethylamine, propylamine, butylamine, pentylamine, hexylamine, heptylamine, 2-ethylhexylamine, octylamine, decylamine, tetradecylamine, pentadecylamine, cetylamine, oleylamine, laurylamine, stearylamine, N,N,N',N'-tetramethylethylenediamine, 1,3-diaminopropane, N,N,N',N'-tetramethyl-1,3-diaminopropane, triethylenetetramine, and tetraethylenepentamine. Examples of the alicyclic amine include cyclohexylamine, dicyclohexylamine, and trimethylcyclohexylamine. Examples of aromatic amines include aniline, benzylamine, dibenzylamine, tribenzylamine, triphenylamine, tri(methylphenyl)amine, tri(ethylphenyl)amine, tri(propylphenyl)amine, tri(butylphenyl)amine, tri(phenoxyphenyl)amine, tri(benzylphenyl)amine, diphenylmethylamine, diphenylethylamine, diphenylpropylamine, diphenylbutylamine, diphenylhexylamine, diphenylcyclohexylamine, N,N'-dicyclohexylaniline, N,N'-dimethylaniline, N,N'-diethylaniline, N,N'-dipropylaniline, N,N'-dibutylaniline, N,N'-dihexylaniline, (methylphenyl)dimethylamine, (ethylphenyl)dimethylamine, (propylphenyl)dimethylamine, (butylphenyl)dimethylamine, bis(methylphenyl)methylamine, bis(ethylphenyl)methylamine, bis(propylphenyl)methylamine, and bis(butylphenyl)methylamine. Examples of heterocyclic amines include pyridine, pyrrolidine, N-methylpyrrolidine, imidazole, piperidine, N-methylpiperidine, piperazine, and N,N'-dimethylpiperazine.

[0032] Examples of alkanolamines include primary alkanolamines such as methanolamine, ethanolamine, isopropanolamine, 1-amino-2-propanol, 2-amino-1-propanol, 4-amino-1-butanolamine, 2-amino-2-methyl-1-propanol, and 2-(2-aminoethoxy)ethanol (also known as diglycolamine); N-methylethanolamine, N-ethylethanolamine, N-methylpropanolamine, diethanolamine, diisopropanolamine, and 2-[(hydroxymethyl)amino]ethanol; secondary alkanolamines such as diethanolamine, 4-methylaminobutanol, 3-piperidinemethanol, 4-piperidinemethanol, 2-piperidineethanol, and 4-piperidineethanol; and tertiary alkanolamines such as methyldiethanolamine, N,N-dimethylethanolamine, N,N-dimethylpropanolamine, N,N-diethylethanolamine, N,N-diethylisopropanolamine, N-ethyldiethanolamine, N-methyldiethanolamine, triethanolamine, and triisopropanolamine.

[0033] Examples of alkylammonium hydroxides include tetraethylammonium hydroxide, tetramethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, tetrapropylammonium hydroxide, dimethylbis(2-hydroxyethyl)ammonium hydroxide, tris(2-hydroxyethyl)methylammonium hydroxide, choline, dimethyldiethylammonium hydroxide, tetraethanolammonium hydroxide, benzyltrimethylammonium hydroxide, benzyltriethylammonium hydroxide, and benzyltributylammonium hydroxide.

[0034] Examples of alkylphosphonium hydroxides include tetrabutylphosphonium hydroxide, tetrapropylphosphonium hydroxide, tetraethylphosphonium hydroxide, tetramethylphosphonium hydroxide, tetraphenylphosphonium hydroxide, methyltriphenylphosphonium hydroxide, ethyltriphenylphosphonium hydroxide, propyltriphenylphosphonium hydroxide, butyltriphenylphosphonium hydroxide, benzyltriphenylphosphonium hydroxide, allyltriphenylphosphonium hydroxide, dodecyltriphenylphosphonium hydroxide, tetradecyltriphenylphosphonium hydroxyde, hexadecyltriphenylphosphonium hydroxide, and hexadecyltributylphosphonium hydroxide.

[0035] The organic base is preferably an alkanolamine.

[0036] The content of the base (C) in the metalworking lubricant composition of the present invention is not particularly limited, but is preferably 60 to 900 parts by mass, more preferably 75 to 800 parts by mass, and even more preferably 90 to 750 parts by mass, based on 100 parts by mass of the compound (B), because this suppresses the generation of putrid odor when the coolant obtained by diluting the composition with water is used for metalworking.

[0037] As described above, the metalworking lubricant composition of the present invention may further contain other components as needed. The other components are not particularly limited as long as they are additives conventionally known to be blended into water-based lubricant compositions, and examples thereof include surfactants, lubricity improvers, antioxidants, pH adjusters, antifoaming agents, anticorrosives, rust inhibitors, preservatives, water softeners, coupling agents, emulsifying aids, fragrances, dyes, and water.

[0038] The surfactant may be an anionic surfactant, a cationic surfactant, or a nonionic surfactant. Of these, nonionic surfactants are preferred from the viewpoint of dilution stability.

[0039] Examples of the anionic surfactant include amine salts of carboxylic acids, metal salts of carboxylic acids (such as alkali metal salts), salts of alkylbenzenesulfonic acids, salts of α-olefinsulfonic acids, and petroleum sulfonates. The carboxylic acid may be a fatty acid or a fatty acid derivative having 6 to 36 carbon atoms. The fatty acid may be either linear or branched, and may be either saturated or unsaturated. Examples of fatty acids having 6 to 36 carbon atoms include caproic acid, caprylic acid, nonanoic acid, lauric acid, pelargonic acid, stearic acid, oleic acid, erucic acid, ricinoleic acid, isononanoic acid, neodecanoic acid, isostearic acid, coconut oil fatty acid, rapeseed oil fatty acid, hydroxy fatty acid such as 12-hydroxystearic acid, adipic acid, dodecanoic acid, sebacic acid, dodecanedioic acid, etc. Examples of fatty acid derivatives include dimer acid, C21 aliphatic dicarboxylic acid, polycondensates of hydroxy fatty acids (polycondensates of ricinoleic acid, 12-hydroxystearic acid, etc., for example, dimers to hexamers), etc.

[0040] Examples of the cationic surfactant include quaternary ammonium salts such as alkyltrimethylammonium salts, dialkyldimethylammonium salts, and alkyldimethylbenzylammonium salts.

[0041] Examples of the nonionic surfactants include polyoxyalkylene alkyl ethers such as polyoxyethylene alkyl ethers and polyoxyethylene polyoxypropylene alkyl ethers; polyethylene glycol polypropylene glycol block polymers, polyoxyethylene alkylphenyl ethers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene fatty acid esters, coconut oil fatty acid diethanolamide, and oleic acid diethanolamide.

[0042] When the metalworking lubricant composition of the present invention contains a surfactant, the content thereof is preferably 3 to 40 mass %, more preferably 5 to 35 mass %, based on the total mass of the composition.

[0043] The rust inhibitor may be an organic acid. This organic acid may be either a monocarboxylic acid or a dicarboxylic acid. Examples include caprylic acid, pelargonic acid, isononanoic acid, capric acid, lauric acid, stearic acid, oleic acid, ricinoleic acid condensate, benzoic acid, p-tert-butylbenzoic acid, adipic acid, suberic acid, sebacic acid, azelaic acid, and dodecanedioic acid.

[0044] When the metalworking lubricant composition of the present invention contains a rust inhibitor, the content thereof is preferably 1 to 20 mass %, more preferably 1 to 15 mass %, based on the total mass of the composition.

[0045] The coupling agent includes alcohols and the like.

[0046] The alcohol is a compound that may be either linear or branched, and is not limited in the number of hydroxy groups. In the case of a monoalcohol, it may be any of primary, secondary, and tertiary alcohols. The alcohol is preferably a compound having 10 to 24 carbon atoms, and examples thereof include decanol, undecanol, lauryl alcohol, tridecanol, tetradecanol, pempadecanol, myristyl alcohol, cetyl alcohol, stearyl alcohol, and oleyl alcohol.

[0047] When the metalworking lubricant composition of the present invention contains an alcohol, the content thereof is preferably 0.5 to 15 mass %, more preferably 0.5 to 10 mass %, based on the total mass of the composition.

[0048] The metalworking lubricant composition of the present invention may contain water.

[0049] In the present invention, the metalworking lubricant composition has a pH at 25° C. when diluted 20 times with water of 7.0 or more and less than 9.0, preferably 7.0 or more and 8.8 or less.

[0050] The metalworking lubricant composition of the present invention can be produced by mixing raw materials containing the base oil (A), the compound (B), and the base (C). The method of using each raw material is not particularly limited, and they may be mixed all at once or in portions.

[0051] The metalworking lubricant composition of the present invention is preferably a stock solution for diluting with water (distilled water, deionized water, tap water, industrial water, etc.) to prepare a coolant for use in metal cutting, grinding, plastic working, etc. Because the composition has a specific structure, a uniform liquid coolant can be obtained by diluting with water without problems such as oil-water separation. The dilution ratio with water when preparing the coolant is not particularly limited, and is usually 5 to 50 times diluted so that the content of compound (B) in the coolant is preferably 0.05 to 3.6 mass %, or the content of base (C) is preferably 90 to 750 mass parts per 100 mass parts of compound (B), and the pH of this coolant at 25°C is preferably 7.0 or more and less than 9.0.

[0052] Metals to which the coolant is applied are preferably aluminum, aluminum alloys, magnesium, magnesium alloys, copper, copper alloys, Inconel, titanium, titanium alloys, stainless steel, carbon steel, alloy steel, cast iron, etc. When such metals are subjected to continuous cutting, grinding, plastic working, etc. to mass-produce various components (processed products), and the coolant is circulated within a manufacturing device and reused, even if microorganisms or the like are mixed in from the outside during use, and the coolant decays over time, no putrid odor is generated, so the working environment is not deteriorated, and the processability is better than conventional methods, contributing to improved productivity. [Example]

[0053] In order to more specifically describe the configuration and effects of the present invention, examples are given below, but the present invention is not limited to these examples. In the following examples and comparative examples, "parts" and "%" are all based on mass.

[0054] 1. Raw materials for manufacturing metalworking lubricant compositions The manufacturing materials used in the examples and comparative examples are shown below.

[0055] 1-1.Base oil (1) Spindle oil The kinematic viscosity (40℃) according to JIS K 2283 is 9mm 2 / seconds. (2) Machine oil The kinematic viscosity (40℃) according to JIS K 2283 is 46mm 2 / seconds.

[0056] 1-2. Benzotriazoles (1) 1,2,3-benzotriazole (2) Tolyltriazole (3) Carboxybenzotriazole (4) 4,5-dimethyl-1,2,3-benzotriazole

[0057] 1-3. Bases (1) Triethanolamine (2) 2-amino-2-methyl-1-propanol (3) Diglycolamine (4) Diisopropanolamine (5) N-Methylethanolamine (6) Methyldiethanolamine (7) Di(2-hydroxyethyl)cyclohexylamine (8) Potassium hydroxide

[0058] 1-4.Fatty acid (1) Oleic acid (2) Ricinoleic acid condensate (3) Pelargonic acid (4) Dodecanedioic acid

[0059] 1-5. Nonionic surfactants X and Y The nonionic surfactant X is "Noigen XL-41" (trade name) manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., and the nonionic surfactant Y is "Noigen XL-70" (trade name) manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.

[0060] 1-6. Dodecanedioic acid Used as a rust prevention additive.

[0061] 1-7. Ricinoleic acid condensates Used as an emulsifying aid.

[0062] 1-8. Coupling agents Branched alcohols were used.

[0063] 2. Production of lubricant compositions and production and evaluation of coolants The lubricant compositions shown in Tables 1 to 6 were produced using the above-mentioned raw materials, and then diluted 20 times with water to obtain coolants. These coolants were then used to conduct a workability test (lubricity confirmation test) on metal materials (aluminum alloy A6061 and cast iron FC250) and a putrid odor confirmation test, and the results are shown in each table.

[0064] (1) Metal workability test Rolling tapping was performed using a Microtap precision tapping machine, Megatap II (product name), and the tapping torque (machining load) was measured. For aluminum alloy A6061, a nitrided tap (M8 x 1.25) was used at a rotation speed of 600 rpm, a cutting speed of 15.1 m / min, and a hooking ratio of 80%. For cast iron FC250, a nitrided tap (M6 x 1.00) was used at a rotation speed of 600 rpm, a cutting speed of 11.3 m / min, and a hooking ratio of 80%. For A6061, a tapping torque of 300 N·cm or less was considered good machinability, and for FC250, a tapping torque of 140 N·cm or less was considered good machinability.

[0065] (2) Putrid odor confirmation test The following experiment was conducted to simulate actual on-site work in which coolant is circulated to perform metal processing.

[0066] Each water-soluble metalworking oil composition of the Examples and Comparative Examples was diluted with tap water to a concentration of 5% by mass to prepare a coolant. Then, 2000 g of each coolant was placed in a 5-liter water tank, to which 200 g of casting chips and 40 g of lubricating oil (manufactured by Mobil Oil, trade name "Vactra No. 2 SLC") were added, and the mixture was circulated using a pump. Next, Yushiroken FGC822J putrefactive fluid (bacterial count: 1 x 10) was added as a seed culture supply solution. 7 CFU / mL, number of yeast; 2 × 10 3 CFU / mL, mold count; 2×10 3 After one day, 40 g of putrefactive fluid was added to the coolant, and then 20 g of putrefactive fluid was added 7 and 14 days after the start of circulation. The test was carried out at room temperature (20 to 25°C). Tap water was replenished once a day to replace the evaporated water. After circulation, the bacterial count was measured every week using a nutrient agar medium by serial dilution plate counting. 7 After CFU / mL was confirmed, the presence or absence of a putrid odor was evaluated when the odor was checked two months later. O: There was a coolant smell, but no putrid smell. ×: A noticeable putrid odor was observed.

[0067] Example 1 The raw materials shown in Table 1, i.e., 5 parts 1,2,3-benzotriazole, 5 parts triethanolamine, 55 parts spindle oil, 3 parts oleic acid, 6 parts pelargonic acid, 1.5 parts nonionic surfactant X, 10 parts nonionic surfactant Y, 2 parts dodecanedioic acid, 10 parts ricinoleic acid condensate, 2 parts alcohol, and 0.5 parts water, were mixed to obtain a lubricant composition. The mixture was then diluted 20 times with water to obtain a coolant consisting of a uniform white emulsion. The pH (25°C) of the resulting coolant was 7.0. Thereafter, a workability test and a putrid odor confirmation test for the metal material were carried out using the methods described above (see Table 1).

[0068] Examples 2 to 24 and Comparative Examples 1 to 18 Using the raw materials shown in Tables 1 to 6, lubricant compositions and coolants were obtained in the same manner as in Example 1. Then, a workability test for metal materials and a putrid odor confirmation test were conducted using the methods described above (see Tables 1 to 6).

[0069] [Table 1]

[0070] [Table 2]

[0071] [Table 3]

[0072] [Table 4]

[0073] [Table 5]

[0074] [Table 6]

[0075] Table 1 reveals the following: Comparative Examples 1, 2, and 3 are examples outside the scope of the present invention, not containing component (B) according to the present invention. The generation of putrid odors was not suppressed, and the tapping torque was high, resulting in insufficient metal workability. Comparative Examples 4 and 5 contain component (B) according to the present invention, but the pH of the coolant was 9.0 or higher, outside the scope of the present invention, resulting in insufficient metal workability. Comparative Example 6 is an example outside the scope of the present invention, in which the pH of the coolant was less than 7.0. Upon dilution with water, a coolant with low stability was obtained, in which oil-water separation progressed over time, and it could not be subjected to odor testing. On the other hand, Examples 1 to 3 are examples using the lubricating oil composition of the present invention. A uniform coolant with a pH in the range of 7.0 or higher but less than 9.0 could be prepared. It was found that this coolant had excellent metal workability and suppressed the generation of putrid odors. Pelargonic acid, which does not affect lubricity, was used to adjust the pH.

[0076] Table 2 reveals the following: Comparative Example 7 is an example outside the scope of the present invention, in which the content ratio of component (C) per 100 parts of component (B) was as low as 80 parts, and the generation of putrid odor was not suppressed. Comparative Example 8 is an example outside the scope of the present invention, in which the content ratio of component (C) per 100 parts of component (B) was as high as 800 parts, and the generation of putrid odor was not suppressed. Comparative Examples 9 and 10 are examples outside the scope of the present invention, in which the component (B) of the present invention is not contained. The generation of putrid odor was not suppressed, and the tapping torque was high and the metal workability was insufficient. On the other hand, Examples 4 and 5 are examples in which the lubricating oil composition of the present invention was used, and the metal workability was excellent and the generation of putrid odor was suppressed. That is, Examples 2, 4, and 5 show that when the content ratio of component (C) per 100 parts of component (B) was 90 to 750 parts by mass, a coolant with excellent metal workability and suppressed generation of putrid odor was obtained.

[0077] Table 3 reveals the following: Comparative Example 11 is an example outside the scope of the present invention, with a low content of component (B) of 2% relative to the total composition, resulting in high tapping torque and insufficient metal workability. Comparative Example 12 is an example outside the scope of the present invention, with a high content of component (B) of 20% relative to the total composition, resulting in a non-uniform coolant with oil-water separation due to dilution with water, making it unsuitable for metal workability and odor tests. On the other hand, Examples 6 to 8 are examples using the lubricating oil composition of the present invention, which exhibited excellent metal workability and suppressed the generation of putrid odors. That is, Examples 2 and 6 to 8 demonstrate that a coolant with excellent metal workability and suppressed the generation of putrid odors can be obtained when the content of component (B) is 2.5 to 18% relative to the total composition.

[0078] The following can be seen from Table 4: Examples 9 to 14 are examples in which an amine other than triethanolamine used in Example 1 etc. was used as component (C), and it was found that a coolant with excellent metal workability and suppressed putrid odor generation could also be obtained by using 2-amino-2-methyl-1-propanol, diglycolamine, diisopropanolamine, N-methylethanolamine, methyldiethanolamine, or di(2-hydroxyethyl)cyclohexylamine.

[0079] The following can be seen from Table 5: Examples 15 to 17 are examples in which a compound other than benzotriazole, which was used in Example 1 etc., was used as component (B), and it was found that even when tolyltriazole, carboxybenzotriazole, or 4,5-dimethyl-1,2,3-benzotriazole was used, a coolant with excellent metal workability and suppressed putrid odor generation could be obtained.

[0080] Table 6 reveals the following: In Examples 18 to 23, machine oil or synthetic oil was used as component (A) instead of the spindle oil used in Example 1, etc., and it was found that coolants with excellent metal workability and suppressed putrid odors were obtained. [Industrial Applicability]

[0081] By using the metalworking lubricant composition of the present invention, by diluting with water, it can obtain a coolant (aqueous metalworking fluid) that has uniform liquidity, maintains good metalworking ability, and further suppresses the deterioration of working environment caused by putrid odor for a long period of time.When mass-producing metal processed products, for example, by circulating this coolant and using it for cutting, grinding, plastic working, etc., it can obtain high productivity.

Claims

1. (A) a base oil, (B) a compound represented by the following general formula (1): 【Chemical 1】 [In the formula, R １ is a hydrogen atom, a hydrocarbon group, a hydroxy group, a nitro group, or a carboxy group, and R ２ is a hydrogen atom or a hydrocarbon group, and R ３ is a hydrogen atom or an organic group represented by the following general formula (2): -(CH ２ ) ｎ -N(R ４ ) ２ (2) (In the formula, each R ４ are the same or different, substituted or unsubstituted hydrocarbon groups, and n is an integer. It is. and (C) base A metalworking lubricant composition comprising: The content of the compound (B) is 2.5 to 18 mass% based on the total mass of the metalworking lubricant composition, the content of the base (C) is 90 to 750 parts by mass relative to 100 parts by mass of the content of the compound (B), A metalworking lubricant composition characterized in that the pH of the metalworking lubricant composition at 25°C when diluted 20 times with water is 7.0 or more and less than 9.

0.

2. 2. The metalworking lubricant composition according to claim 1, wherein the base (C) is at least one selected from metal hydroxides and amines.

3. 2. The metalworking lubricant composition according to claim 1, wherein the content of the base oil (A) is 10 to 70 mass % based on the total mass of the composition.

4. The metalworking lubricant composition according to claim 1, further comprising a surfactant.

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