Workability-imparting rust-preventive oil composition

Abstract

To provide a workability-imparting rust-preventive oil composition having superior rust prevention and wear resistance.SOLUTION: A workability-imparting rust-preventive oil composition comprises: (A) a hydrocarbon-based oil; (B) barium sulfonate; and (C) a partial ester of a polyhydric alcohol, the polyhydric alcohol partial ester (C) including an ester derived from a tetravalent or higher polyhydric alcohol and a saturated fatty acid.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a processability-imparting rust-preventive oil composition. [Background technology]

[0002] 2. Description of the Related Art In the field of metal members such as steel plates, bearings, steel balls, and guide rails, rust-preventive oil compositions have been used to prevent the formation of rust on the metal members. Metallic members made of steel, etc., whose main component is iron, are ultimately prevented from rusting by painting, plating, etc., but such treatment is difficult during the manufacturing process. Therefore, from the viewpoint of temporarily preventing rusting of the metallic members during the manufacturing process, the metallic members are generally treated with a rust-preventive oil composition.

[0003] When a rust-preventive oil composition is applied during a manufacturing process, if the application process is followed by a processing process such as plastic working, it is common to remove the rust-preventive oil composition and then reapply a processing oil composition. On the other hand, if the rust preventive oil composition applied first has the function of a processing oil composition, the reapplication process can be eliminated, improving productivity. Also, if the oil has excellent abrasion resistance during processing, the life of the tools can be extended, which reduces the frequency of tool replacement and further increases productivity.

[0004] For example, Patent Document 1 describes a method for producing a viscoelastic polymer having a kinetic viscosity of 4 to 50 mm at 40° C. 2 The present invention relates to a rust-preventive oil composition for machining, which is substantially free of barium and which comprises a mineral oil and / or synthetic oil having a carbon number of 14 or more at 40° C. or less and a fatty acid ester of a polyhydric alcohol having less than 1 OH group in the molecule, (B) an overbased metal sulfonate, and (C) a neutral metal sulfonate, and which uses a mineral oil and / or synthetic oil having a carbon number of 14 or more at 40° C. or less and a fatty acid ester of a polyhydric alcohol having less than 1 OH group in the molecule, and which is substantially free of barium, 2 / s and (b) a low viscosity base oil with a kinematic viscosity of 10 to 100 mm at 40°C. 2and a high-viscosity base oil having a viscosity of 1:10 / s is mixed in a mass ratio of component (a):component (b) in the range of 1:2 to 1:15, components (B) and (C) are blended in an amount of 1 to 20 mass% each based on the total amount of the composition, and component (D) is blended in an amount of 1 to 10 mass% based on the total amount of the composition, and the mass ratio of component (B) to components (C) and (D) (B):[(C)+(D)] is in the range of 1:1 to 1:2. It is disclosed that the rust-preventive oil composition for both machining and processing has excellent degreasing properties, and is also excellent in rust prevention and lubrication properties as compared with conventional rust-preventive oil compositions. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2012-062488 A Summary of the Invention [Problem to be solved by the invention]

[0006] Even if a common fatty acid, fatty acid ester, or sulfur-based extreme pressure agent, which simply provides processability, is added to a conventional rust preventive oil composition, surface defects such as stains may occur. Furthermore, the rust-preventive oil composition for both machining and processing disclosed in Patent Document 1 leaves room for improvement in terms of wear resistance and stain resistance.

[0007] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a processability-imparting rust-preventive oil composition having good rust prevention properties, wear resistance and stain resistance. [Means for solving the problem]

[0008] The inventors investigated additives that can improve rust resistance and processability, and found that the above problems could be solved by combining barium sulfonate with a partial ester of a polyhydric alcohol having a specific valence or higher, thereby completing the present invention. Specifically, the present invention employs the following configuration.

[0009] [1] A processability-imparting rust-preventive oil composition comprising a hydrocarbon base oil (A), barium sulfonate (B), and a partial ester of a polyhydric alcohol (C), the partial ester of the polyhydric alcohol (C) comprising an ester obtained from a tetrahydric or higher polyhydric alcohol and a saturated fatty acid. [2] The workability-imparting rust-preventive oil composition according to [1], wherein the barium sulfonate (B) is a barium dialkylnaphthalenesulfonate or a barium dialkylbenzenesulfonate. [3] The processability-imparting rust-preventive oil composition according to [1] or [2], wherein the tetrahydric or higher polyhydric alcohol is sorbitan. [4] The workability-imparting rust-preventive oil composition according to any one of [1] to [3], wherein the content of the barium sulfonate (B) is more than 0.3 parts by mass and less than 7.0 parts by mass per 100 parts by mass of the hydrocarbon base oil (A). [5] The workability-imparting rust-preventive oil composition according to any one of [1] to [4], wherein the content of the partial ester of a tetrahydric or higher polyhydric alcohol (C) is more than 0.3 parts by mass and less than 10 parts by mass per 100 parts by mass of the hydrocarbon base oil (A). [6] The processability-imparting rust-preventive oil composition according to any one of [1] to [5], which is used as a calibration fluid for inspecting diesel injectors. Effect of the Invention

[0010] According to the present invention, it is possible to provide a processability-imparting rust-preventive oil composition having good rust prevention properties, wear resistance, and stain resistance. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (Workability-imparting rust-preventive oil composition) The processability-imparting rust-preventive oil composition of the present embodiment is a composition that has the functions of both a processing oil composition and a rust-preventive oil composition, and is a composition that can improve processability while also improving rust prevention properties.

[0012] The kinetic viscosity of the processability-imparting rust-preventive oil composition of this embodiment at 40°C is 2.00 mm 2 / s or more is preferable, and 2.20 mm 2 / s or more is preferable, and 2.45 mm 2 It is even more preferable that the ratio is 1 / s or more. The kinetic viscosity of the processability-imparting rust-preventive oil composition of this embodiment at 40°C is 3.50 mm 2 / s or less is preferable, and 3.00 mm 2 / s or less is more preferable, and 2.75 mm 2 It is even more preferable that the ratio is equal to or less than 1 / s.

[0013] When the kinetic viscosity at 40° C. of the workability-imparting rust-preventive oil composition of this embodiment is equal to or greater than the above-mentioned preferable lower limit, the workability is further improved. When the kinetic viscosity at 40° C. of the workability-imparting rust-preventive oil composition of this embodiment is equal to or lower than the above preferred upper limit, the amount of wear powder generated is further reduced.

[0014] The kinetic viscosity of the processability-imparting rust-preventive oil composition of the embodiment at 40°C is 2.00 mm 2 / s or more 3.50mm 2 / s or less is preferable, and 2.20 mm 2 / s or more 3.00mm 2 / s or less is more preferable, and 2.45 mm 2 / s or more 2.75mm 2 It is even more preferable that the ratio is equal to or less than 1 / s.

[0015] In this specification, unless otherwise specified, the kinetic viscosity at 40°C means the kinetic viscosity at 40°C measured in accordance with JIS K2283:2000.

[0016] The workability-imparting rust-preventive oil composition of this embodiment contains a hydrocarbon base oil (A) (hereinafter also referred to as "component (A)"), barium sulfonate (B) (hereinafter also referred to as "component (B)"), and a partial ester of a polyhydric alcohol (C) (hereinafter also referred to as "component (C)").

[0017] <Hydrocarbon base oil (A)> Examples of the component (A) include saturated aliphatic hydrocarbon oils, unsaturated aliphatic hydrocarbon oils (olefin-based hydrocarbons), alicyclic hydrocarbon oils (naphthenic hydrocarbons), and aromatic hydrocarbon oils. The aliphatic saturated hydrocarbon oil may be a straight-chain saturated hydrocarbon oil (normal paraffin-based hydrocarbon) or a branched-chain saturated hydrocarbon oil (isoparaffin-based hydrocarbon).

[0018] The kinetic viscosity of component (A) at 40°C is 2.00mm 2 / s or more is preferable, and 2.20 mm 2 / s or more is preferable, and 2.45 mm 2 It is even more preferable that the ratio is 1 / s or more. The kinetic viscosity of component (A) at 40°C is 3.50mm 2 / s or less is preferable, and 3.00 mm 2 / s or less is more preferable, and 2.75 mm 2 It is even more preferable that the ratio is equal to or less than 1 / s.

[0019] When the kinetic viscosity of component (A) at 40° C. is at least the above preferred lower limit, processability is further improved. When the kinetic viscosity of component (A) at 40° C. is equal to or less than the above preferred upper limit, the amount of wear powder generated is further reduced.

[0020] The kinetic viscosity of component (A) at 40°C is 2.00mm 2 / s or more 3.50mm 2 / s or less is preferable, and 2.20 mm 2 / s or more 3.00mm 2 / s or less is more preferable, and 2.45 mm 2 / s or more 2.75mm 2 It is even more preferable that the ratio is equal to or less than 1 / s.

[0021] Specific examples of the component (A) include mineral oils and synthetic oils.

[0022] Mineral oil As the mineral oil, a distillate oil obtained by atmospheric distillation of crude oil can be used. In addition, a lubricating oil fraction obtained by further distilling the distillate oil under reduced pressure and refining the distillate oil by various refining processes can also be used. The refining process may be a suitable combination of hydrorefining, solvent extraction, solvent dewaxing, hydrodewaxing, sulfuric acid washing, clay treatment, etc. Mineral oil can be obtained by combining these refining processes in a suitable order. In addition, a mixture of a plurality of refined oils having different properties obtained by subjecting different crude oils or distillate oils to a combination of different refining processes may be used.

[0023] Component (A) may consist of one mineral oil, or may be a mixed base oil containing two or more mineral oils. When two or more types are contained, they may be naphthenic or paraffinic, or may contain a synthetic type, as described below.

[0024] ·Synthetic oil Examples of synthetic oils include polyolefins and alkylbenzenes.

[0025] Polyolefin Examples of polyolefins include homopolymers or copolymers of olefin monomers having 2 to 16 carbon atoms, preferably 2 to 12 carbon atoms, and hydrogenated polymers thereof. The olefin monomers may be any of α-olefins, internal olefins, linear olefins, and branched olefins. Specific examples of such olefin monomers include ethylene, propylene, 1-butene, 2-butene, isobutene, pentene, hexene, heptene, octene, nonene, decene, undecene, dodecene, tridecene, tetradecene, pentadecene, hexadecene, and mixtures thereof.

[0026] The polyolefin can be produced by a known method. For example, it can be produced by a thermal reaction without a catalyst, or the target polyolefin can be produced by homopolymerizing or copolymerizing the olefin using a known catalyst such as an organic peroxide catalyst such as benzoyl peroxide; a Friedel-Crafts catalyst such as aluminum chloride, aluminum chloride-polyhydric alcohol system, aluminum chloride-titanium tetrachloride system, aluminum chloride-alkyltin halide system, or boron fluoride; a Ziegler type catalyst such as organic aluminum chloride-titanium tetrachloride system or organic aluminum-titanium tetrachloride system; a metallocene type catalyst such as aluminoxane-zirconocene system or ionic compound-zirconocene system; or a Lewis acid complex type catalyst such as aluminum chloride-base system or boron fluoride-base system.

[0027] Alkylbenzene The alkylbenzene preferably has 1 to 4 alkyl groups each having 1 to 40 carbon atoms in the molecule. The alkyl group of the alkylbenzene may be linear or branched.

[0028] The alkylbenzene can be produced by a known method, for example, by using an aromatic compound as a raw material, an alkylating agent and an alkylation catalyst. Specific examples of the aromatic compound used as the raw material include benzene, toluene, xylene, ethylbenzene, methylethylbenzene, diethylbenzene, and mixtures thereof. Specific examples of the alkylating agent include linear or branched olefins having 6 to 40 carbon atoms obtained by polymerization of lower monoolefins such as ethylene, propylene, butene, and isobutylene, preferably propylene; linear or branched olefins having 6 to 40 carbon atoms obtained by thermal decomposition of wax, heavy oil, petroleum fractions, polyethylene, polypropylene, and the like; linear olefins having 9 to 40 carbon atoms obtained by separating n-paraffins from petroleum fractions such as kerosene and diesel and olefinating them with a catalyst, and mixtures of these. Examples of the alkylation catalyst used in the alkylation include known catalysts such as Friedel-Crafts type catalysts, such as aluminum chloride and zinc chloride; and acidic catalysts, such as sulfuric acid, phosphoric acid, tungstosilicic acid, hydrofluoric acid, and activated clay.

[0029] <Barium sulfonate (B)> The sulfonic acid used as the raw material for component (B) may be a known one produced by a conventional method, such as petroleum sulfonic acid or synthetic sulfonic acid.

[0030] Petroleum sulfonic acids Petroleum sulfonic acids are generally sulfonated alkyl aromatic compounds in the lubricating oil fraction of mineral oils, or mahogany acid, which is a by-product in the manufacture of white oil.

[0031] Synthetic sulfonic acids Examples of synthetic sulfonic acids include those by-produced in alkylbenzene manufacturing plants, which are raw materials for detergents, etc., or those obtained by alkylating polyolefins with benzene to produce sulfonated alkylbenzenes having linear or branched alkyl groups, or those obtained by sulfonating alkylnaphthalenes such as dinonylnaphthalene, etc. There are no particular limitations on the molecular weight of these sulfonic acids, but those having a molecular weight of 100 to 1500, and more preferably 200 to 700, are used.

[0032] Of the above sulfonic acids, it is preferable to use at least one selected from the group consisting of dialkylnaphthalenesulfonic acids in which the total number of carbon atoms in two alkyl groups bonded to a naphthalene ring is 14 to 30; dialkylbenzenesulfonic acids in which two alkyl groups bonded to a benzene ring are each a linear alkyl group or a branched alkyl group having one side-chain methyl group, and the total number of carbon atoms in the two alkyl groups is 14 to 30; and monoalkylbenzenesulfonic acids in which the number of carbon atoms in the alkyl group bonded to a benzene ring is 15 or more.

[0033] ··Dialkylnaphthalenesulfonic Acid In the case of dialkylnaphthalenesulfonic acid having a total carbon number of 14 to 30 in the two alkyl groups bonded to the naphthalene ring, if the total carbon number of the two alkyl groups is 14 or more, the demulsibility is improved, whereas if the total carbon number is 30 or less, the storage stability is improved. The two alkyl groups may be linear or branched. As long as the total carbon number of the two alkyl groups is 14 to 30, there is no particular restriction on the carbon number of each alkyl group, but it is preferable that each alkyl group has a carbon number of 6 to 18.

[0034] ··Dialkylbenzenesulfonic acid In a dialkylbenzenesulfonic acid in which two alkyl groups bonded to a benzene ring are each a straight-chain alkyl group or a branched-chain alkyl group having one side-chain methyl group, and the two alkyl groups have a total carbon number of 14 to 30, if the alkyl group has a carbon number of 14 or more, the demulsibility is improved, whereas if the alkyl group has a carbon number of 30 or less, the storage stability is improved. As long as the two alkyl groups bonded to a benzene ring have a total carbon number of 14 to 30, there are no particular limitations on the number of carbon atoms in each alkyl group, but it is preferable that each alkyl group has a carbon number of 6 to 18.

[0035] Monoalkylbenzene sulfonic acid The storage stability of monoalkylbenzenesulfonic acid having 15 or more carbon atoms in one alkyl group bonded to the benzene ring is improved if the alkyl group has 14 or more carbon atoms. The alkyl group bonded to the benzene ring may be linear or branched.

[0036] Specific examples of sulfonates obtained using the above raw materials include neutral (normal salt) sulfonates obtained by reacting a barium base (such as an oxide or hydroxide of barium) with sulfonic acid; basic sulfonates obtained by heating the above neutral (normal salt) sulfonate with an excess of a barium base in the presence of water; carbonate overbased (superbasic) sulfonates obtained by reacting the above neutral (normal salt) sulfonate with a barium base in the presence of carbon dioxide; borate overbased (superbasic) sulfonates obtained by reacting the above neutral (normal salt) sulfonate with a barium base and a boric acid compound such as boric acid or boric acid anhydride, or by reacting the above carbonate overbased (superbasic) sulfonate with a boric acid compound such as boric acid or boric acid anhydride, and mixtures thereof.

[0037] When producing the above neutral (normal salt) sulfonate, barium chloride may be added as a reaction accelerator.

[0038] Of the above, the (B) component is preferably a neutral (normal salt) sulfonate obtained by reacting a barium base (such as barium oxide or hydroxide) with a sulfonic acid, as this can further improve the rust prevention properties, and more preferably a neutral (normal salt) sulfonate obtained by reacting a barium base (such as barium oxide or hydroxide) with a dialkylnaphthalenesulfonic acid or a dialkylbenzenesulfonic acid. Specifically, barium dialkylnaphthalene sulfonate and barium dialkylbenzene sulfonate are preferred. The preferred carbon numbers of the alkyl in the barium dialkylnaphthalene sulfonate and barium dialkylbenzene sulfonate are as described above.

[0039] The component (B) contained in the workability-imparting rust-preventive oil composition of this embodiment may be one type or two or more types. The content of component (B) is preferably more than 0.3 mass %, more preferably 0.5 mass % or more, even more preferably 0.8 mass % or more, and particularly preferably 1.0 mass % or more, based on the entire workability-imparting rust-preventive oil composition. The content of component (B) is preferably less than 7.0 mass %, more preferably 6.0 mass % or less, and even more preferably 5.0 mass % or less, based on the entire workability-imparting rust-preventive oil composition.

[0040] When the content of component (B) is at least the above preferable lower limit, the abrasion resistance is further improved. When the content of the component (B) is equal to or less than the above preferable upper limit, the occurrence of stains can be further suppressed.

[0041] For example, the content of component (B) is preferably more than 0.3 mass% and less than 7.0 mass%, more preferably from 0.5 mass% to 6.0 mass%, even more preferably from 0.8 mass% to 5.0 mass%, and particularly preferably from 1.0 mass% to 5.0 mass%, based on the entire workability-imparting rust-preventive oil composition.

[0042] <Partial ester of polyhydric alcohol (C)> A partial ester of a polyhydric alcohol is an ester in which at least one or more hydroxy groups in the polyhydric alcohol is not esterified and remains as a hydroxy group. The component (C) contains an ester (C1) (hereinafter also referred to as "component (C1)") obtained from a tetrahydric or higher polyhydric alcohol and a saturated fatty acid.

[0043] <Ester (C1) obtained from tetrahydric or higher polyhydric alcohol and saturated fatty acid> The tetrahydric or higher polyhydric alcohol used as a raw material for the component (C1) is preferably a polyhydric alcohol having 4 to 10, more preferably 4 to 6, hydroxy groups in the molecule and 2 to 20, more preferably 3 to 10 carbon atoms.

[0044] Examples of tetrahydric or higher polyhydric alcohols used as a raw material for the component (C1) include di-(trimethylolpropane), tri-(trimethylolpropane), pentaerythritol, dipentaerythritol, tri-(pentaerythritol), polyglycerin (dimer or trimer of glycerin), sorbitol, and sorbitan. Of these, the tetrahydric or higher polyhydric alcohol used as a raw material for the component (C1) is preferably sorbitan.

[0045] The fatty acid used as the raw material for the component (C1) is a saturated fatty acid. When the component (C1) is an ester obtained from a saturated fatty acid, it has a lower bulk and can form a denser adsorption film compared to, for example, an ester selected from an unsaturated fatty acid whose molecule is bent at the double bond. In addition, the fatty acid used as the raw material for the component (C1) is preferably a monovalent saturated fatty acid. When the component (C1) is an ester obtained from a monovalent saturated fatty acid, it has a lower bulk and can form a denser adsorption film compared to an ester selected from a divalent saturated fatty acid. The fatty acid used as a raw material for the component (C1) may be a straight-chain saturated fatty acid or a branched-chain saturated fatty acid.

[0046] The fatty acid used as a raw material for the component (C1) is preferably a monovalent saturated fatty acid having 8 to 30 carbon atoms, more preferably a monovalent saturated fatty acid having 10 to 20 carbon atoms, and even more preferably a monovalent saturated fatty acid having 14 to 20 carbon atoms.

[0047] The component (C) contained in the processability-imparting rust-preventive oil composition of this embodiment may be one type or two or more types. The content of component (C) is preferably more than 0.3 mass %, more preferably 0.5 mass % or more, even more preferably 1.0 mass % or more, and particularly preferably 4.0 mass % or more, based on the entire workability-imparting rust-preventive oil composition. The content of component (C) is preferably less than 10 mass %, more preferably 9.0 mass % or less, and even more preferably 8.0 mass % or less, based on the entire workability-imparting rust-preventive oil composition.

[0048] When the content of component (C) is at least the above preferable lower limit, the abrasion resistance is further improved. When the content of component (C) is equal to or less than the above preferable upper limit, the occurrence of stains can be further suppressed.

[0049] For example, the content of component (C) is preferably more than 0.3 mass% and less than 10 mass%, more preferably from 0.5 mass% to 9.0 mass%, even more preferably from 1.0 mass% to 8.0 mass%, and particularly preferably from 4.0 mass% to 8.0 mass%, based on the entire workability-imparting rust-preventive oil composition.

[0050] The content of the component (C1) relative to the total amount of the component (C) is preferably 80 mass % or more, more preferably 90 mass % or more, and even more preferably 95 mass % or more, and may be 100 mass %.

[0051] <Optional ingredients> The processability-imparting rust-preventive oil composition of this embodiment may contain optional components other than the above-mentioned components (A), (B), and (C), such as antioxidants, corrosion inhibitors, antifoaming agents, antiwear or extreme pressure agents, viscosity index improvers, pour point depressants, mist inhibitors, metal deactivators, and demulsifiers.

[0052] Examples of the antioxidant include phenolic compounds such as 2,6-di-t-butylphenol and 2,6-di-t-butyl-p-cresol; and amine compounds such as diphenylamine, dialkyldiphenylamine, phenyl-α-naphthylamine, and p-alkylphenyl-α-naphthylamine. When the workability-imparting rust-preventive oil composition contains an antioxidant, the content is, for example, 0.5 to 10 mass% based on the total amount of the workability-imparting rust-preventive oil composition. The antioxidant may be used alone or in combination of two or more antioxidants.

[0053] As the corrosion inhibitor, for example, known corrosion inhibitors such as benzotriazole-based compounds, tolyltriazole-based compounds, thiadiazole-based compounds, and imidazole-based compounds can be used. When the workability-imparting rust-preventive oil composition contains a corrosion inhibitor, the content is, for example, 0.01 to 10 mass% based on the total amount of the workability-imparting rust-preventive oil composition. The corrosion inhibitor may be used alone or in combination of multiple corrosion inhibitors.

[0054] The antifoaming agent may be a silicone-based antifoaming agent.

[0055] Examples of anti-wear agents or extreme pressure agents include organic zinc compounds such as zinc dialkyldithiophosphate and zinc dialkyldithiocarbamate; sulfur-containing compounds such as molybdenum dialkyldithiocarbamate, dihydrocarbyl polysulfide, sulfurized ester, thiazole compounds, and thiadiazole compounds; and phosphorus-based extreme pressure agents such as phosphate esters, acidic phosphate esters, amine salts of acidic phosphate esters, and phosphites. The processability-imparting rust-preventive oil composition of this embodiment preferably does not contain an anti-wear agent or an extreme pressure agent.

[0056] Examples of viscosity index improvers include non-dispersant or dispersant poly(meth)acrylate-based viscosity index improvers, non-dispersant or dispersant olefin-(meth)acrylate copolymer-based viscosity index improvers, styrene-maleic anhydride ester copolymer-based viscosity index improvers, and mixtures thereof.

[0057] The pour point depressant may, for example, be a polymethacrylate-based polymer that is compatible with the base oil (A).

[0058] Examples of the mist suppressant include ethylene-propylene copolymer, polymethacrylate, polyisobutylene, polybutene, etc. The average molecular weight of these compounds as the mist suppressant is usually 10,000 to 8,000,000.

[0059] Metal deactivators include benzotriazole, tolyltriazole, and their derivatives.

[0060] Examples of the demulsifier include polyalkylene glycol-based nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, and polyoxyethylene alkyl naphthyl ether.

[0061] The processability-imparting rust-preventive oil composition of the present embodiment has good rust prevention, wear resistance, and stain resistance, and is therefore particularly useful as a calibration fluid for inspecting diesel injectors. One embodiment of the processability-imparting rust-preventive oil composition is a calibration fluid for inspecting diesel injectors, which consists only of the above-mentioned components (A), (B) and (C). A diesel injector is a system that supplies fuel to a diesel engine. A calibration fluid is a fluid that is used to test whether the diesel injector is capable of spraying the proper amount of liquid.

[0062] When the workability-imparting rust-preventive oil composition of this embodiment is used as a calibration fluid for the inspection of diesel injectors (hereinafter simply referred to as the "calibration fluid of this embodiment"), the workability-imparting rust-preventive oil composition of this embodiment satisfies the following parameters. Note that the following parameters mean values ​​determined in accordance with ISO4113.

[0063] [density] The density of the calibration fluid in this embodiment is 0.820 g / cm 3 More than 0.830g / cm 3 Less than or equal to 0.8235 g / cm 3 More than 0.8265g / cm 3 It is preferable that:

[0064] [flash point] The flash point of the calibration fluid in this embodiment is 75° C. or higher.

[0065] [Kinematic viscosity] The 40°C kinematic viscosity of the calibration fluid in this embodiment is 2.45 mm 2 / s or more 2.75mm 2 / s or less, 2.50 mm 2 / s or more 2.55mm 2 It is preferable that the ratio is 1 / s or less.

[0066] [Distillation properties] The calibration fluid of this embodiment preferably has a distillation amount of 5% or less at 210°C and a distillation amount of 95% or less at 360°C.

[0067] [Oxidation stability] The calibration fluid of this embodiment has an oxidized sludge amount of 0.05 mgKOH / g or less and a total acid number of 0.7 mgKOH / g or less.

[0068] [moisture] The water content of the calibration fluid in this embodiment is 500 mg / kg or less. EXAMPLES

[0069] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples.

[0070] <Formulation of workability-imparting rust-preventive oil composition> The workability-imparting rust-preventive oil compositions of Examples 1 to 7 and the workability-imparting rust-preventive oil compositions of Comparative Examples 1 to 8 were prepared by blending the components in the blending ratios shown in Tables 1 and 2. In Tables 1 and 2, the numerical values ​​for component (A) indicate the content (mass%) of each base oil relative to the total amount of component (A), and for other components, the numerical values ​​indicate the content (parts by mass) of each component relative to the total amount (100 parts by mass) of component (A).

[0071] (1)Component (A) A-1: Base solvent 21 (mineral oil-based solvent), dynamic viscosity (40°C) 1.6822 mm 2 / s, density (15℃) 0.7942g / cm 3 A-2: Kurisef Oil H8 (naphthenic mineral oil), kinematic viscosity (40°C) 8.7573 mm 2 / s, density (15℃) 0.9104g / cm 3 A-3: High Solvent 240 (mineral oil-based solvent), dynamic viscosity (40°C) 2.4594 mm 2 / s, density (15℃) 0.8043g / cm 3 A-4: Super Oil K10 (Gr.I mineral oil), kinematic viscosity (40℃) 9.7416mm 2 / s, density (15℃) 0.8502g / cm 3 The mixture of the above components (A) used in the processability-imparting rust-preventive oil compositions of Examples 1 to 7 and the processability-imparting rust-preventive oil compositions of Comparative Examples 1 to 8 had a kinetic viscosity of 2.58 mm at 40° C., measured in accordance with JIS K2283:2000. 2 / s.

[0072] (2)(B) Ingredients, etc. B-1: Barium dinonylnaphthalene sulfonate B-2: Barium didodecylbenzenesulfonate b-1: Calcium dinonylnaphthalene sulfonate b-2: Calcium didodecylbenzenesulfonate

[0073] (3)(C) Ingredients, etc. C-1: A mixture of sorbitan monoisostearate, sorbitan diisostearate and sorbitan triisostearate c-1: Sorbitan monooleate c-2: Lanolinic acid oleyl ester c-3: Trimethylolpropane octyl (full ester) C-4: Trimethylolpropane octyl (mixture of mono, di, and tri)

[0074] [Kinematic viscosity] The kinetic viscosity at 40° C. of each example of the workability-imparting rust-preventive oil composition, measured in accordance with JIS K2283:2000, is shown in Tables 1 and 2.

[0075] [Density, flash point, moisture, distillation properties, oxidation stability] The density, flash point, water content, distillation properties, and oxidation stability of each of the workability-imparting rust-preventive oil compositions were measured in accordance with ISO 4113. The results are shown in Tables 1 and 2.

[0076] [Evaluation of wear resistance] <Measurement of wear volume> A four-ball test was carried out in accordance with ASTM D2783. The test was carried out for 15 seconds, with a rotation speed of 1450±40 rpm and a load of 525 N. The average values ​​of three tests are shown in Tables 1 and 2. The values ​​were rounded off to two decimal places.

[0077] [Evaluation of rust prevention] <Neutral salt spray test> The test was carried out in accordance with the JIS K2246 neutral salt spray test method. Note that the results shown in Tables 1 and 2 are not the average rust occurrence rate of the three test pieces, but the occurrence rate of each of the three pieces.

[0078] <Stack Test> The test pieces were covered with oil in the same way as in the JIS K2246 neutral salt spray test, and two of these were stacked on top of each other, held horizontally with a 100g weight placed on top of them, and then kept in a constant temperature and humidity chamber at 60°C and 90% humidity for 48 hours.The degree of discoloration of the stacked surfaces was then evaluated. Discoloration was evaluated on a scale from A to E according to the rust generation measurement method of JIS K2246.

[0079] [Table 1]

[0080] [Table 2]

[0081] As shown in Tables 1 and 2, it was confirmed that the processability-imparting rust-preventive oil compositions of the Examples were able to achieve high levels of rust prevention, wear resistance, and stain resistance, compared to the processability-imparting rust-preventive oil compositions of the Comparative Examples.

Claims

1. The present invention relates to an oil composition comprising a hydrocarbon base oil (A), a barium sulfonate (B), and a partial ester of a polyhydric alcohol (C), The processability-imparting rust-preventive oil composition, wherein the partial ester (C) of a polyhydric alcohol comprises an ester obtained from a tetrahydric or higher polyhydric alcohol and a saturated fatty acid.

2. 2. The workability-imparting rust-preventive oil composition according to claim 1, wherein the barium sulfonate (B) is a barium dialkylnaphthalenesulfonate or a barium dialkylbenzenesulfonate.

3. 3. The processability-imparting rust-preventive oil composition according to claim 1, wherein the polyhydric alcohol having 4 or more valences is sorbitan.

4. The workability-imparting rust-preventive oil composition according to claim 1 or 2, wherein the content of the barium sulfonate (B) is more than 0.3 parts by mass and less than 7.0 parts by mass per 100 parts by mass of the hydrocarbon base oil (A).

5. 3. The workability-imparting rust-preventive oil composition according to claim 1, wherein the content of the partial ester (C) of a tetrahydric or higher polyhydric alcohol is more than 0.3 parts by mass and less than 10 parts by mass per 100 parts by mass of the hydrocarbon base oil (A).

6. 3. The processability-imparting rust-preventive oil composition according to claim 1, which is used as a calibration fluid for inspecting diesel injectors.

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