Industrial oil composition

Abstract

The industrial oil composition comprises a mineral oil or a synthetic oil as a base oil, and a neutral phosphite derivative represented by the following formula (B) and a 2,6-di-tert-butylphenol derivative represented by the following formula (C) as an antioxidant. b21 ~R b24 Each independently represents an aliphatic hydrocarbon group having 10 to 16 carbon atoms. c1 It is a straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms. #imgabs0#

Description

Technical Field

[0001] The present invention relates to an industrial oil composition. Background Art

[0002] Patent Document 1 describes a lubricating oil composition comprising (A) 0.008 to 0.04 mass % of a sarcosine derivative, (B) 0.01 to 0.07 mass % of an alkenyl succinate, (C) 0.1 to 3.0 mass % of an amine antioxidant, and (D) 0.1 to 3.0 mass % of a phenolic antioxidant in a hydrocarbon base oil selected from mineral oils and synthetic oils, based on the total amount of the composition.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-179197 Summary of the invention

[0006] However, the lubricating oil composition of Patent Document 1 has a problem that it cannot be used for a long period of time.

[0007] Therefore, an object of the present invention is to provide an industrial oil composition that has a long life and can be used for a long period of time.

[0008] The industrial oil composition of the present invention contains mineral oil or synthetic oil as a base oil, a neutral phosphite derivative represented by the following formula (B) as an antioxidant, and a 2,6-di-tert-butylphenol derivative represented by the following formula (C).

[0009]

[0010] (In the above formula (B), R b21 ~R b24 Each independently represents an aliphatic hydrocarbon group having 10 to 16 carbon atoms, and R b25 ~R b28 Each independently represents a linear or branched alkyl group having 1 to 6 carbon atoms, and R b291 and R b292 Each independently represents a hydrogen atom or a linear or branched alkyl group having 1 to 5 carbon atoms, and R b291 and R b292 The total number of carbon atoms is 1 to 5.)

[0011]

[0012] (In the above formula (C), R c1 It is a linear or branched alkyl group having 1 to 12 carbon atoms.

[0013] The industrial oil composition of the present invention has a long life and can be used for a long period of time. DETAILED DESCRIPTION

[0014] The mode (embodiment) for implementing the present invention is described in detail. The present invention is not limited to the contents described in the following embodiments. In addition, the constituent elements described below include elements that can be easily thought of by a person skilled in the art, and elements that are actually the same. Furthermore, the structures described below can be appropriately combined. In addition, various omissions, substitutions or changes of the structures can be made without departing from the gist of the present invention.

[0015] <Industrial Oil Composition of Embodiment 1>

[0016] The industrial oil composition of Embodiment 1 contains a synthetic oil as a base oil and an antioxidant.

[0017] The synthetic oil used in the industrial oil composition of embodiment 1 includes a phosphate derivative, tris(isopropylphenyl) phosphate and tripropyl phosphate. In this specification, they are respectively referred to as the first component, the second component and the third component. The synthetic oil including the first component, the second component and the third component is flame retardant. Therefore, the industrial oil composition of embodiment 1 can also be used at high temperatures.

[0018] The phosphate derivative (first component, CAS 125997-21-9) has a repeating unit represented by the following formula (A1), has a structure represented by the following formula (A2) at one end, and has a structure represented by the following formula (A3) at the other end. Specifically, in the phosphate derivative, the repeating unit (A1) is repeated 1 or 2 or more times. In addition, the structure (A2) is bonded to one end, i.e., the end on the benzene ring side of the structure (A1), and the structure (A3) is bonded to the other end, i.e., the end on the O side of the structure (A1). In addition, the kinetic viscosity of the phosphate derivative at 40°C (JIS K2283) is 100 cSt to 200 cSt.

[0019]

[0020] Such phosphate derivatives have excellent flame retardancy and can specifically satisfy the following four requirements.

[0021] (1) The ignition point of the phosphate derivative is 550°C or higher.

[0022] (2) When the phosphate derivative is heated to 400°C and comes into contact with flame, it will not continue to burn.

[0023] (3) When a phosphate ester derivative is heated to 400°C and a metal rod heated to 700°C is immersed therein, it does not continue to burn.

[0024] (4) When a mist of a phosphate derivative is sprayed toward a flame and a metal rod heated to 700°C, it does not continue to burn.

[0025] As a commercially available phosphoric acid ester derivative, ADK STAB PFR (registered trademark, manufactured by ADEKA Co., Ltd., kinematic viscosity at 40°C 147.3 cSt, flash point (JIS K 2265-4:2007) 332°C, no combustion point and no ignition point) is preferably used. This commercially available product satisfies the above four requirements.

[0026] Tris(isopropylphenyl)phosphate (second component, Isopropylphenyl phosphate, CAS 68937-41-7) and tripropyl phosphate (third component, Triphenyl phosphate, CAS 115-86-6) are used to adjust the viscosity of the base oil. From the viewpoint of viscosity adjustment, it is preferred that the second component is contained in an amount of 5% to 95% by mass, and the third component is contained in an amount of 5% to 95% by mass, in the total of 100% by mass of the second component and the third component. The second component and the third component are commercially available as a mixture, and these commercial products can be used. As such commercial products, a mixture containing 41% by mass of the second component (kinematic viscosity at 40°C (JIS K 2283) 21 cSt, flash point (JIS K 2265-4:2007) 256°C, combustion point 320°C, no ignition point) and a mixture containing 24% by mass of the second component (kinematic viscosity at 40°C (JIS K2283) 26 cSt) are preferably used.

[0027] From the viewpoint of flame retardancy, it is preferred that the first component is contained in an amount of 3% to 70% by mass in 100% by mass of the base oil. In addition, the base oil (synthetic oil) is composed of the first component, the second component and the third component. From the viewpoint of flame retardancy, viscosity and lubricity, it is preferred that the first component is contained in an amount of 3% to 70% by mass in 100% by mass of the base oil, and the second component and the third component are contained in an amount of 30% to 97% by mass in total. It should be noted that the base oil may contain other components other than the first component, the second component and the third component within the range that does not hinder flame retardancy.

[0028] The antioxidant includes a neutral phosphite derivative and a 2,6-di-tert-butylphenol derivative. Since the above two derivatives are used in combination as antioxidants, the molecules of the antioxidant are not easily destroyed when the industrial oil composition is used, and the consumption of the antioxidant can be suppressed. Compared with the use of the neutral phosphite derivative and the 2,6-di-tert-butylphenol derivative separately, the consumption of the antioxidant can be suppressed. Therefore, the antioxidant ability of the industrial oil composition can be maintained for a long time. That is, the oxidation stability of the industrial oil composition is excellent, the viscosity change is also suppressed, and it can be used for a long time. In addition, since the industrial oil composition of embodiment 1 includes a flame retardant base oil, it can also be used at high temperatures. It is important that the industrial oil composition used at high temperatures has an antioxidant function. According to the combination of the above two antioxidants, the antioxidant function can be maintained for a long time even when the industrial oil composition is used at high temperatures.

[0029] The neutral phosphite derivative is represented by the following formula (B). The neutral phosphite derivative may be used alone or in combination of two or more. Since the neutral phosphite derivative is a dimer, it is not easy to evaporate and can effectively exert antioxidant performance.

[0030]

[0031] In formula (B), R b21 ~R b24 Each independently represents an aliphatic hydrocarbon group having 10 to 16 carbon atoms.

[0032] The aliphatic hydrocarbon group having 10 to 16 carbon atoms may be a straight chain, branched chain or cyclic aliphatic hydrocarbon group, or a saturated or unsaturated aliphatic hydrocarbon group. As the aliphatic hydrocarbon group having 10 to 16 carbon atoms, specifically, a straight chain alkyl group such as decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl (cetyl) can be preferably used.

[0033] R b25 ~R b28 Each independently represents a linear or branched alkyl group having 1 to 6 carbon atoms.

[0034] Examples of the linear or branched alkyl group having 1 to 6 carbon atoms include methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, isopropyl, sec-butyl, isobutyl, tert-butyl, isopentyl, tert-pentyl, neopentyl and isohexyl.

[0035] Neutral phosphite due to the R b25 ~R b28 It has a specific substituent, so in addition to the anti-oxidation performance, it also has excellent wear resistance. It is believed that this is because if R b25 ~R b28By having a specific substituent, the film of the industrial oil composition attached to the sliding portion becomes more stable.

[0036] Especially in R b25 and R b27 is a linear alkyl group having 1 to 6 carbon atoms, preferably 1 to 3 carbon atoms, and R b26 and R b28 When the carbon number is 3 to 6, preferably 3 to 4, branched alkyl groups, the effect of improving the wear resistance is further enhanced.

[0037] R b291 and R b292 Each independently represents a hydrogen atom or a linear or branched alkyl group having 1 to 5 carbon atoms.

[0038] Examples of the linear or branched alkyl group having 1 to 5 carbon atoms include methyl, ethyl, n-propyl, n-butyl, n-pentyl, isopropyl, sec-butyl, isobutyl, tert-butyl, isopentyl, tert-pentyl and neopentyl.

[0039] Among them, R b291 and R b292 The total number of carbon atoms in is 1 to 5. Therefore, for example, R b291 When it is a hydrogen atom, R b292 is a linear or branched alkyl group having 1 to 5 carbon atoms, R b291 When it is methyl, R b292 is a linear or branched alkyl group having 1 to 4 carbon atoms, R b291 When it is ethyl, R b292 It is a linear or branched alkyl group having 2 to 3 carbon atoms.

[0040] Since the film of the industrial oil composition becomes more stable, R is more preferred. b291 is a hydrogen atom, R b292 It is a linear or branched alkyl group having 1 to 5 carbon atoms.

[0041] The 2,6-di-tert-butylphenol derivative is represented by the following formula (C): The 2,6-di-tert-butylphenol derivative may be used alone or in combination of two or more.

[0042]

[0043] In formula (C), R c1It is a linear or branched alkyl group having 1 to 12 carbon atoms. Examples of the linear or branched alkyl group having 1 to 12 carbon atoms include methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, isobutyl, n-pentyl, isopentyl, tert-pentyl, neopentyl, hexyl, heptyl, isoheptyl, n-octyl, isooctyl, 2-ethylhexyl, nonyl, and decyl. When the alkyl group is the above, the compatibility of the 2,6-di-tert-butylphenol derivative is improved.

[0044] In the industrial oil composition of the first embodiment, the neutral phosphite derivative is preferably contained in an amount of 0.001 to 5 parts by mass relative to 100 parts by mass of the base oil. In addition, the 2,6-di-tert-butylphenol derivative is preferably contained in an amount of 0.001 to 5 parts by mass relative to 100 parts by mass of the base oil. If the antioxidant is contained in the above amount, the antioxidant function can be further maintained for a long time.

[0045] When the base oil contains a phosphoric acid ester derivative in an amount of 50% by mass or less in 100% by mass, a hindered amine compound may be further included as an antioxidant. If the phosphoric acid ester derivative contains the above amount, the hindered amine compound can be appropriately mixed with the base oil. If the hindered amine compound is used, the antioxidant function of the industrial oil composition can be further improved. In addition, even when the industrial oil composition is used at high temperature, the antioxidant function can be further improved.

[0046] The hindered amine compound is represented by the following formula (D). The hindered amine compound may be used alone or in combination of two or more.

[0047]

[0048] R d21 and R d22 Each independently represents an aliphatic hydrocarbon group having 1 to 10 carbon atoms.

[0049] The aliphatic hydrocarbon group having 1 to 10 carbon atoms may be a linear, branched or cyclic aliphatic hydrocarbon group, and may be a saturated or unsaturated aliphatic hydrocarbon group.

[0050] As the aliphatic hydrocarbon group having 1 to 10 carbon atoms, specifically, a linear or branched alkyl group such as a methyl group, an ethyl group, an n-propyl group, an n-butyl group, an n-pentyl group, an n-hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an isopropyl group, a sec-butyl group, an isobutyl group, a tert-butyl group, an isopentyl group, a tert-pentyl group, a neopentyl group, an isohexyl group, and a 2-ethylhexyl group can be preferably used. Among these groups, a linear or branched alkyl group having 5 to 10 carbon atoms is more preferred from the viewpoint of improving durability.

[0051] R d23 It represents a divalent aliphatic hydrocarbon group having 1 to 10 carbon atoms.

[0052] As the divalent aliphatic hydrocarbon group having 1 to 10 carbon atoms, divalent straight-chain or branched alkylene groups such as methylene, 1,2-ethylene, 1,3-propylene, 1,4-butylene, 1,5-pentylene, 1,6-hexylene, 1,7-heptylene, 1,8-octylene, 1,9-nonylene, 1,10-decylene, and 3-methyl-1,5-pentenyl can be preferably used. Among these groups, from the viewpoint of improving durability, divalent straight-chain or branched alkylene groups having 5 to 10 carbon atoms are more preferred.

[0053] From the viewpoint of improving durability at high temperatures, it is more preferable that R d21 , R d22 and R d23 The sum of the number of carbon atoms is 16 to 30.

[0054] In the industrial oil composition of the first embodiment, when a hindered amine compound is used, the hindered amine compound is preferably contained in an amount of 0.002 to 5 parts by mass based on 100 parts by mass of the base oil.

[0055] The industrial oil composition of the first embodiment may further contain other additives. Examples of other additives include oiliness agents, anti-wear agents, extreme pressure agents, metal deactivators, and rust inhibitors. The industrial oil composition preferably contains these additives within a range that does not hinder long-term use at high temperatures.

[0056] The industrial oil composition of Embodiment 1 can be prepared by appropriately mixing the above-mentioned components.

[0057] The industrial oil composition of embodiment 1 may be an industrial oil composition for metal processing or an industrial oil composition for mechanical lubrication. As an industrial oil composition for metal processing, for example, cutting oil, rolling oil, drawing and stretching oil, cleaning oil, plastic processing oil, perforating oil, heat treatment oil, and thermal medium oil may be cited. As an industrial oil composition for mechanical lubrication, for example, turbine oil, hydraulic oil, bearing oil, gear oil, compressor oil, and traction oil may be cited. The industrial oil composition of embodiment 1 is preferably used for use at high temperatures, especially in the above-mentioned uses, because it can be used at high temperatures for a long time. For example, it is particularly preferably used as turbine oil, hydraulic oil, and rolling oil.

[0058] <Industrial Oil Composition of Embodiment 2>

[0059] The industrial oil composition of Embodiment 2 is different in base oil from that of Embodiment 1. That is, the industrial oil composition of Embodiment 2 contains mineral oil as a base oil and an antioxidant.

[0060] Examples of the mineral oil include paraffinic base oils and naphthenic base oils. The mineral oil may be used alone or in combination of two or more.

[0061] In the industrial oil composition of the second embodiment, the antioxidant comprises a neutral phosphite derivative and a 2,6-di-tert-butylphenol derivative. Since the above two are used in combination as the antioxidant, the consumption of the antioxidant can be suppressed when the industrial oil composition is used. Therefore, the antioxidant ability can be maintained for a long time. That is, the industrial oil composition has excellent oxidation stability, and the viscosity change is also suppressed, and it can be used for a long time. The details of the neutral phosphite derivative and the 2,6-di-tert-butylphenol derivative are the same as those described in the first embodiment.

[0062] In the industrial oil composition of the second embodiment, the neutral phosphite derivative is preferably contained in an amount of 0.001 to 5 parts by mass relative to 100 parts by mass of the base oil. In addition, the 2,6-di-tert-butylphenol derivative is preferably contained in an amount of 0.001 to 5 parts by mass relative to 100 parts by mass of the base oil. If the antioxidant is contained in the above amount, the antioxidant function can be further maintained for a long time.

[0063] As an antioxidant, a hindered amine compound may be further included. If a hindered amine compound is used, the antioxidant function of the industrial oil composition can be further improved. The hindered amine compound can be appropriately mixed with the mineral oil. The details of the hindered amine compound are the same as those described in Embodiment 1.

[0064] In the industrial oil composition of the second embodiment, when a hindered amine compound is used, the hindered amine compound is preferably contained in an amount of 0.002 to 5 parts by mass based on 100 parts by mass of the base oil.

[0065] The industrial oil composition of the second embodiment can be prepared by appropriately mixing the above-mentioned components.

[0066] The industrial oil composition of Embodiment 2 may contain other additives. Specific examples of other additives are the same as those described in the industrial oil composition of Embodiment 1. These are preferably contained in a range that does not hinder the long-term use of the industrial oil composition.

[0067] The industrial oil composition of the second embodiment may be an industrial oil composition for metalworking or an industrial oil composition for machine lubrication. Specific examples of the industrial oil composition for metalworking and the industrial oil composition for machine lubrication are the same as those described in the industrial oil composition of the first embodiment. The industrial oil composition of the second embodiment is particularly preferably used as a hydraulic oil because it can be used for a long period of time.

[0068] <Industrial Oil Composition According to Other Embodiments>

[0069] As another embodiment, there can be mentioned an industrial oil composition having a base oil different from that of Embodiments 1 and 2. For example, the industrial oil composition of another embodiment contains a synthetic oil and an antioxidant other than the phosphate ester base oil used in the industrial oil composition of Embodiment 1. Such synthetic oils include paraffin hydrocarbon oils, polyol ester oils, and ether oils.

[0070] The paraffin hydrocarbon oil is preferably an α-olefin polymer having 30 or more carbon atoms, and preferably an α-olefin polymer having 30 to 50 carbon atoms. The paraffin hydrocarbon oil may be used alone or in combination of two or more. As the α-olefin polymer, for example, a monomer selected from ethylene and an α-olefin having 3 to 18 carbon atoms, preferably an α-olefin having 10 to 18 carbon atoms, and a copolymer of at least two monomers selected from ethylene and an α-olefin having 3 to 18 carbon atoms, preferably an α-olefin having 10 to 18 carbon atoms. Specifically, trimers of 1-tetradecene, trimers of 1-undecene, trimers of 1-dodecene, trimers of 1-tridecene, trimers of 1-tetradecene, copolymers of 1-hexene and 1-pentene, etc. may be cited. In addition, the paraffin hydrocarbon oil preferably has a kinematic viscosity of 4 cSt to 6 cSt at 100°C.

[0071] The polyol ester oil is preferably a polyol ester oil having no hydroxyl group in the molecule. The polyol ester oil may be used alone or in combination of two or more.

[0072] Such polyol ester oil can be produced by reacting a polyol having at least two hydroxyl groups in one molecule and a monovalent acid or a salt thereof at a mixing molar ratio ((monovalent acid or a salt thereof) / polyol) of 1 or more. In this case, the obtained polyol ester oil is a full ester having no hydroxyl groups in the molecule.

[0073] Examples of the polyol include neopentyl glycol, trimethylolpropane, pentaerythritol, and dipentaerythritol. Examples of the monovalent acid include saturated aliphatic monocarboxylic acids such as acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, neopentanoic acid, heptanoic acid, octanoic acid, nonanoic acid, capric acid, lauric acid, myristic acid, and palmitic acid.

[0074] Unsaturated aliphatic monocarboxylic acids such as stearic acid, acrylic acid, crotonic acid, and oleic acid;

[0075] Cyclic carboxylic acids such as benzoic acid, phenylacetic acid, naphthoic acid, cinnamic acid, cyclohexanecarboxylic acid, nicotinic acid, isonicotinic acid, furan-2-carboxylic acid, pyrrole-N-carboxylic acid, monoethyl malonate, and ethyl hydrogen phthalate, etc. Examples of the salt of the monovalent acid include chlorides of the monovalent acid.

[0076] Specific examples of the polyol ester oil include neopentyl glycol-decanoic acid / octanoic acid mixed ester, trimethylolpropane-valeric acid / heptanoic acid mixed ester, trimethylolpropane-decanoic acid / octanoic acid mixed ester, trimethylolpropane nonanoate, and pentaerythritol-heptanoic acid / decanoic acid mixed ester.

[0077] From the viewpoint of preventing corrosion, the ether oil is preferably an ether oil having no hydroxyl group in the molecule, and more preferably an ether oil represented by the following formula (1). The ether oil may be used alone or in combination of two or more.

[0078]

[0079] In formula (1), R 1 and R 3 R each independently represents an alkyl group having 1 to 18 carbon atoms or a monovalent aromatic hydrocarbon group having 6 to 18 carbon atoms. 2 It represents an alkylene group having 1 to 18 carbon atoms or a divalent aromatic hydrocarbon group having 6 to 18 carbon atoms. n is an integer of 1 to 5.

[0080] Specific examples of the alkyl group having 1 to 18 carbon atoms include methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, neopentyl, hexyl, isohexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, etc. Specific examples of the monovalent aromatic hydrocarbon group having 6 to 18 carbon atoms include propyl, tolyl, xylyl, benzyl, phenethyl, 1-phenylethyl, 1-methyl-1-phenylethyl, etc.

[0081] Specific examples of the alkylene group having 1 to 18 carbon atoms include methylene, ethylene, propylene, and butylene. Specific examples of the divalent aromatic hydrocarbon group having 6 to 18 carbon atoms include phenylene and 1,2-naphthylene.

[0082] In the industrial oil composition of other embodiments, the antioxidant comprises a neutral phosphite derivative and a 2,6-di-tert-butylphenol derivative. Since the above two are used in combination as antioxidants, the industrial oil composition is stabilized, the viscosity change is also suppressed, and it can be used for a long time. The details of the neutral phosphite derivative and the 2,6-di-tert-butylphenol derivative are the same as those described in Embodiment 1. It should be noted that in the industrial oil composition of other embodiments, the preferred amounts of the neutral phosphite derivative and the 2,6-di-tert-butylphenol derivative and the reasons therefor are also the same as those in Embodiment 1.

[0083] In the industrial oil composition of other embodiments, a hindered amine compound may be further included as an antioxidant. If a hindered amine compound is used, the antioxidant function of the industrial oil composition can be further improved. The details of the hindered amine compound are the same as those described in Embodiment 1. It should be noted that in the industrial oil composition of other embodiments, the preferred amount of the hindered amine compound is also the same as that of Embodiment 1.

[0084] The industrial oil composition of other embodiments may contain other additives. Specific examples of other additives are the same as those described in the industrial oil composition of Embodiment 1. It is preferred that these additives be contained within a range that does not hinder the long-term use of the industrial oil composition.

[0085] The industrial oil composition of other embodiments may be an industrial oil composition for metalworking or an industrial oil composition for machine lubrication. Specific examples of the industrial oil composition for metalworking and the industrial oil composition for machine lubrication are the same as those described in the industrial oil composition of embodiment 1.

[0086] Based on the above, the present invention relates to the following contents.

[0087] [1] An industrial oil composition comprising a mineral oil or a synthetic oil as a base oil, a neutral phosphite derivative represented by the following formula (B) as an antioxidant, and a 2,6-di-tert-butylphenol derivative represented by the following formula (C).

[0088]

[0089] (In the above formula (B), R b21 ~R b24 Each independently represents an aliphatic hydrocarbon group having 10 to 16 carbon atoms, and R b25 ~R b28 Each independently represents a linear or branched alkyl group having 1 to 6 carbon atoms, and R b291 and R b292 Each independently represents a hydrogen atom or a linear or branched alkyl group having 1 to 5 carbon atoms, and R b291 and R b292 The total number of carbon atoms is 1 to 5.)

[0090]

[0091] (In the above formula (C), R c1 It is a linear or branched alkyl group having 1 to 12 carbon atoms.

[0092] The industrial oil composition of [1] above has a long life and can be used for a long period of time.

[0093] [2] An industrial oil composition according to [1], wherein the base oil is a synthetic oil, the synthetic oil comprising a phosphate derivative, tri(isopropylphenyl) phosphate and tripropyl phosphate, the phosphate derivative having a repeating unit represented by the following formula (A1), having a structure represented by the following formula (A2) at one end and a structure represented by the following formula (A3) at the other end, and having a kinematic viscosity at 40°C of 100 cSt to 200 cSt.

[0094]

[0095] The industrial oil composition of [2] above can be used for a long period of time even at high temperatures.

[0096] [3] The industrial oil composition according to [2], comprising the phosphate ester derivative in an amount of 50% by mass or less, based on 100% by mass of the total amount of the synthetic oil, and further comprising a hindered amine compound represented by the following formula (D) as the antioxidant.

[0097]

[0098] (In the above formula (D), R d21 and R d22 Each independently represents an aliphatic hydrocarbon group having 1 to 10 carbon atoms, and R d23 It represents a divalent aliphatic hydrocarbon group having 1 to 10 carbon atoms.

[0099] The industrial oil composition of the above-mentioned [3] can further improve the antioxidant function even when used at high temperature.

[0100] [4] The industrial oil composition according to [1], wherein the base oil is a mineral oil, and further comprises a hindered amine compound represented by the following formula (D) as the antioxidant.

[0101]

[0102] (In the above formula (D), R d21 and R d22 Each independently represents an aliphatic hydrocarbon group having 1 to 10 carbon atoms, and R d23 It represents a divalent aliphatic hydrocarbon group having 1 to 10 carbon atoms.

[0103] The antioxidant function of the industrial oil composition of the above-mentioned [4] can be further improved.

[0104] [Example]

[0105] The present invention will be described in more detail based on the following examples, but the present invention is not limited to these examples.

[0106] [Example 1-1-1]

[0107] A mixture (trade name: Reofos 35, manufactured by Ajinomoto Fine-Techno Co., Inc., containing 41% by mass of the second component in the mixture) of 60% by mass of a phosphoric acid ester derivative (first component, CAS 125997-21-9, trade name: ADKSTAB PFR (registered trademark) PFR, manufactured by ADEKA Co., Ltd., kinematic viscosity at 40°C (JIS K 2283) 147.3 cSt), tri(isopropylphenyl) phosphate (second component, CAS 68937-41-7) and tripropyl phosphate (third component, CAS 115-86-6) was used as the base oil. 40% by mass of a synthetic oil was used.

[0108] With respect to 100 parts by mass of the synthetic oil, 0.1 parts by mass of 4,4′-butylenebis(3-methyl-6-tert-butylphenyl ditridecyl phosphate) as a neutral phosphite derivative and 0.1 parts by mass of octyl=3-(3,5-di-tert-butyl-4-hydroxypropyl) propionate (CAS 125643-61-0, trade name: IRGANOX (registered trademark) L135, manufactured by BASF Japan Co., Ltd.) as a 2,6-di-tert-butylphenol derivative were mixed to obtain an industrial oil composition.

[0109] [Example 1-1-2]

[0110] An industrial oil composition was obtained in the same manner as in Example 1-1-1 except that a mixture of tri(isopropylphenyl) phosphate (second component, CAS 68937-41-7) and triphenyl phosphate (third component, CAS 115-86-6) (trade name: Reofos 65, manufactured by Ajinomoto Fine-Techno Co., Inc., containing 24 mass % of the second component in the mixture. Kinematic viscosity at 40° C. (JIS K 2283) 26 cSt) was used instead of the mixture of tri(isopropylphenyl) phosphate and triphenyl phosphate (trade name: Reofos 35, manufactured by Ajinomoto Fine-Techno Co., Inc.).

[0111] [Examples 1-1-3 to 1-1-8]

[0112] As a neutral phosphite derivative, 4,4′-butylenebis(3-methyl-6-tert-butylphenyl ditridecyl phosphate) (Rb21 ~R b24 =Tridecyl, R b25 , R b27 = methyl, R b26 , R b28 = tert-butyl, R b291 = Hydrogen atom, R b292 =n-propyl) and using the compound of Table 1, the same procedures as in Example 1-1-1 were carried out to obtain an industrial oil composition.

[0113] [Table 1]

[0114] Table 1

[0115] Example <![CDATA[R b21 ~R b24 ]]> <![CDATA[R b25 、R b27 ]]> <![CDATA[R b26 、R b28 ]]> <![CDATA[R b291 ]]> <![CDATA[R b292 ]]> 1-1-3 Decyl methyl Tert-butyl Hydrogen Atom n-propyl 1-1-4 Hexadecyl methyl Tert-butyl Hydrogen n-propyl 1-1-5 Tridecyl n-propyl Tert-butyl Hydrogen Atom n-propyl 1-1-6 Tridecyl methyl Isobutyl Hydrogen Atom n-propyl 1-1-7 Tridecyl methyl Tert-butyl Hydrogen Atom n-pentyl 1-1-8 Tridecyl methyl Tert-butyl Ethyl n-propyl

[0116] [Example 1-1-9]

[0117] An industrial oil composition was obtained in the same manner as in Example 1-1-1 except that 0.001 parts by mass of the neutral phosphite derivative was used instead of 0.1 parts by mass of the neutral phosphite derivative based on 100 parts by mass of the synthetic oil.

[0118] [Example 1-1-10]

[0119] An industrial oil composition was obtained in the same manner as in Example 1-1-1 except that 5 parts by mass of the neutral phosphite derivative was used instead of 0.1 parts by mass of the neutral phosphite derivative based on 100 parts by mass of the synthetic oil.

[0120] [Example 1-1-11]

[0121] An industrial oil composition was obtained in the same manner as in Example 1-1-1 except that 0.001 parts by mass of the 2,6-di-tert-butylphenol derivative was used instead of 0.1 parts by mass of the 2,6-di-tert-butylphenol derivative based on 100 parts by mass of the synthetic oil.

[0122] [Example 1-1-12]

[0123] An industrial oil composition was obtained in the same manner as in Example 1-1-1 except that 5 parts by mass of the 2,6-di-tert-butylphenol derivative was used instead of 0.1 parts by mass of the 2,6-di-tert-butylphenol derivative per 100 parts by mass of the synthetic oil.

[0124] [Example 1-2-1]

[0125] A synthetic oil containing 50% by mass of a mixture of a phosphate ester derivative (first component, CAS 125997-21-9, trade name: ADK STAB PFR (registered trademark) PFR, manufactured by ADEKA Co., Ltd., kinematic viscosity at 40°C (JIS K 2283) 147.3 cSt), tri(isopropylphenyl) phosphate (second component, CAS 68937-41-7) and triphenyl phosphate (third component, CAS 115-86-6) (trade name: Reofos 35, manufactured by Ajinomoto Fine-Techno Co., Inc., containing 41% by mass of the second component in the mixture. Kinematic viscosity at 40°C (JIS K 2283) 21 cSt, flash point (JIS K2265-4:2007) 256°C, combustion point 320°C, no ignition point) was used as a base oil.

[0126] With respect to 100 parts by mass of the synthetic oil, 0.1 parts by mass of 4,4′-butylenebis(3-methyl-6-tert-butylphenyl ditridecyl phosphate) as a neutral phosphite derivative, 0.1 parts by mass of octyl=3-(3,5-di-tert-butyl-4-hydroxypropyl) propionate (CAS 125643-61-0, trade name: IRGANOX (registered trademark) L135, manufactured by BASF Japan Co., Ltd.) as a 2,6-di-tert-butylphenol derivative, and 0.1 parts by mass of bis(2,2,6,6-tetramethyl-1-(octyloxy)piperidin-4-yl) sebacate as a hindered amine compound were mixed to obtain an industrial oil composition.

[0127] [Example 1-2-2]

[0128] An industrial oil composition was obtained in the same manner as in Example 1-2-1 except that a mixture of tri(isopropylphenyl) phosphate (second component, CAS 68937-41-7) and tripropyl phosphate (third component, CAS 115-86-6) (trade name: Reofos 65, manufactured by Ajinomoto Fine-Techno Co., Inc., containing 24 mass % of the second component in the mixture. Kinematic viscosity at 40° C. (JIS K 2283) 26 cSt) was used instead of the mixture of tri(isopropylphenyl) phosphate and triphenyl phosphate (trade name: Reofos 35, manufactured by Ajinomoto Fine-Techno Co., Inc.).

[0129] [Examples 1-2-3 to 1-2-8]

[0130] Instead of 4,4'-butylenebis(3-methyl-6-tert-butylphenyl ditridecyl phosphate) (R b21~R b24 =Tridecyl, R b25 , R b27 = methyl, R b26 , R b28 = tert-butyl, R b291 = Hydrogen atom, R b292 =n-propyl) and using the compound shown in Table 2, the same procedure as in Example 1-2-1 was carried out to obtain an industrial oil composition.

[0131] [Table 2]

[0132] Table 2

[0133] Example <![CDATA[R b21 ~R b24 ]]> <![CDATA[R b25 、R b27 ]]> <![CDATA[R b26 、R b28 ]]> <![CDATA[R b291 ]]> <![CDATA[R b292 ]]> 1-2-3 Decyl methyl Tert-butyl Hydrogen Atom n-propyl 1-2-4 Hexadecyl methyl Tert-butyl Hydrogen Atom n-propyl 1-2-5 Tridecyl n-propyl Tert-butyl Hydrogen Atom n-propyl 1-2-6 Tridecyl methyl Isobutyl Hydrogen Atom n-propyl 1-2-7 Tridecyl methyl Tert-butyl Hydrogen Atom n-pentyl 1-2-8 Tridecyl methyl Tert-butyl Ethyl n-propyl

[0134] [Example 1-2-9]

[0135] An industrial oil composition was obtained in the same manner as in Example 1-2-1 except that 0.001 parts by mass of the neutral phosphite derivative was used instead of 0.1 parts by mass of the neutral phosphite derivative based on 100 parts by mass of the synthetic oil.

[0136] [Example 1-2-10]

[0137] An industrial oil composition was obtained in the same manner as in Example 1-2-1 except that 5 parts by mass of the neutral phosphite derivative was used instead of 0.1 parts by mass of the neutral phosphite derivative based on 100 parts by mass of the synthetic oil.

[0138] [Example 1-2-11]

[0139] An industrial oil composition was obtained in the same manner as in Example 1-2-1 except that 0.001 parts by mass of the 2,6-di-tert-butylphenol derivative was used instead of 0.1 parts by mass of the 2,6-di-tert-butylphenol derivative based on 100 parts by mass of the synthetic oil.

[0140] [Example 1-2-12]

[0141] An industrial oil composition was obtained in the same manner as in Example 1-2-1 except that 5 parts by mass of the 2,6-di-tert-butylphenol derivative was used instead of 0.1 parts by mass of the 2,6-di-tert-butylphenol derivative based on 100 parts by mass of the synthetic oil.

[0142] [Examples 1-2-13 to 1-2-18]

[0143] As a hindered amine compound, bis(2,2,6,6-tetramethyl-1-(octyloxy)piperidin-4-yl) sebacate (Rd21 , R d22 = n-octyl, R d23 An industrial oil composition was obtained in the same manner as in Example 1-2-1 except that the compound shown in Table 3 was used instead of 1,8-octenyl.

[0144] [Table 3]

[0145] Table 3

[0146] Example <![CDATA[R d21 、R d22 ]]> <![CDATA[R d23 ]]> 1-2-13 methyl Methylene 1-2-14 n-propyl 1,3-propylene 1-2-15 n-pentyl 1,5-pentylene 1-2-16 n-pentyl 1,5-pentylene 1-2-17 n-Hexyl 1,6-Hexamethylene 1-2-18 n-Decyl 1,10-Decylene

[0147] [Example 1-2-19]

[0148] An industrial oil composition was obtained in the same manner as in Example 1-2-1 except that 0.002 parts by mass of the hindered amine compound was used instead of 0.1 parts by mass of the hindered amine compound based on 100 parts by mass of the synthetic oil.

[0149] [Example 1-2-20]

[0150] An industrial oil composition was obtained in the same manner as in Example 1-2-1 except that 5 parts by mass of the hindered amine compound was used instead of 0.1 parts by mass of the hindered amine compound based on 100 parts by mass of the synthetic oil.

[0151] [Example 2-1-1]

[0152] An industrial oil composition was obtained by mixing 0.1 parts by mass of 4,4′-butylenebis(3-methyl-6-tert-butylphenyl ditridecyl phosphate) as a neutral phosphite derivative and 0.1 parts by mass of octyl=3-(3,5-di-tert-butyl-4-hydroxypropyl) propionate (CAS 125643-61-0, trade name: IRGANOX (registered trademark) L135, manufactured by BASF Japan Co., Ltd.) as a 2,6-di-tert-butylphenol derivative with respect to 100 parts by mass of mineral oil (trade name: 350NEUTRAL, manufactured by ENEOS Corporation) to obtain an industrial oil composition.

[0153] [Example 2-1-2]

[0154] An industrial oil composition was obtained in the same manner as in Example 2-1-1 except that 0.001 parts by mass of the neutral phosphite derivative was used instead of 0.1 parts by mass of the neutral phosphite derivative per 100 parts by mass of the mineral oil.

[0155] [Example 2-1-3]

[0156] An industrial oil composition was obtained in the same manner as in Example 2-1-1 except that 5 parts by mass of the neutral phosphite derivative was used instead of 0.1 parts by mass of the neutral phosphite derivative per 100 parts by mass of the mineral oil.

[0157] [Example 2-1-4]

[0158] An industrial oil composition was obtained in the same manner as in Example 2-1-1 except that 0.001 parts by mass of the 2,6-di-tert-butylphenol derivative was used instead of 0.1 parts by mass of the 2,6-di-tert-butylphenol derivative per 100 parts by mass of the mineral oil.

[0159] [Example 2-1-5]

[0160] An industrial oil composition was obtained in the same manner as in Example 2-1-1 except that 5 parts by mass of the 2,6-di-tert-butylphenol derivative was used instead of 0.1 parts by mass of the 2,6-di-tert-butylphenol derivative per 100 parts by mass of the mineral oil.

[0161] [Example 2-2-1]

[0162] An industrial oil composition was obtained by mixing 0.1 parts by mass of 4,4′-butylenebis(3-methyl-6-tert-butylphenyl ditridecyl phosphate) as a neutral phosphite derivative, 0.1 parts by mass of octyl=3-(3,5-di-tert-butyl-4-hydroxypropyl) propionate (CAS 125643-61-0, trade name: IRGANOX (registered trademark) L135, manufactured by BASF Japan Co., Ltd.) as a 2,6-di-tert-butylphenol derivative, and 0.1 parts by mass of bis(2,2,6,6-tetramethyl-1-(octyloxy)piperidin-4-yl) sebacate as a hindered amine compound with 100 parts by mass of mineral oil (trade name: 350NEUTRAL, manufactured by ENEOS Corporation) to obtain an industrial oil composition.

[0163] [Example 2-2-2]

[0164] An industrial oil composition was obtained in the same manner as in Example 2-2-1 except that 0.001 parts by mass of the neutral phosphite derivative was used instead of 0.1 parts by mass of the neutral phosphite derivative based on 100 parts by mass of the mineral oil.

[0165] [Example 2-2-3]

[0166] An industrial oil composition was obtained in the same manner as in Example 2-2-1 except that 5 parts by mass of the neutral phosphite derivative was used instead of 0.1 parts by mass of the neutral phosphite derivative based on 100 parts by mass of the mineral oil.

[0167] [Example 2-2-4]

[0168] An industrial oil composition was obtained in the same manner as in Example 2-2-1 except that 0.001 parts by mass of the 2,6-di-tert-butylphenol derivative was used instead of 0.1 parts by mass of the 2,6-di-tert-butylphenol derivative per 100 parts by mass of the mineral oil.

[0169] [Example 2-2-5]

[0170] An industrial oil composition was obtained in the same manner as in Example 2-2-1 except that 5 parts by mass of the 2,6-di-tert-butylphenol derivative was used instead of 0.1 parts by mass of the 2,6-di-tert-butylphenol derivative per 100 parts by mass of the mineral oil.

[0171] [Example 2-2-6]

[0172] An industrial oil composition was obtained in the same manner as in Example 2-2-1 except that 0.002 parts by mass of the hindered amine compound was used instead of 0.1 parts by mass of the hindered amine compound based on 100 parts by mass of the mineral oil.

[0173] [Example 2-2-7]

[0174] An industrial oil composition was obtained in the same manner as in Example 2-2-1 except that 5 parts by mass of the hindered amine compound was used instead of 0.1 parts by mass of the hindered amine compound based on 100 parts by mass of the mineral oil.

[0175] [Evaluation method and evaluation results]

[0176] First, prepare two cylindrical discs (30 mm in diameter, 5 mm in thickness, made of SUJ2). Apply the industrial oil composition obtained in the embodiment to the bottom surface of one disc, and overlap the bottom surface of another disc on the applied industrial oil composition. In the industrial oil composition obtained in the embodiment heated to 80°C in a container, immerse the two overlapping discs in a direction perpendicular to the bottom surface and the ground. Next, press the other disc with a pressure of 150 kg relative to one disc and rotate one disc at 1000 rpm for 3 hours or 6 hours. In this way, an industrial oil composition that has undergone a thermal history of 3 hours or 6 hours is prepared.

[0177] Next, a vibrator friction test was performed on the industrial oil composition that had undergone a 3-hour or 6-hour thermal history to determine the friction coefficient. Specifically, the industrial oil composition between the disks and the industrial oil composition in the container after rotation for 3 hours or 6 hours were combined and used for the vibrator friction test. In addition, the friction coefficient was similarly determined for the industrial oil composition obtained in the example in the state after preparation (state without thermal history).

[0178] Table 4 shows the results.

[0179] [Table 4-1]

[0180] Table 4

[0181]

[0182] [Table 4-2]

[0183] Table 4 (continued)

[0184]

[0185] [Table 4-3]

[0186] Table 4 (continued)

[0187]

[0188] It can be seen that the industrial oil composition of the embodiment can suppress the friction coefficient to a low level after a long-term heat history, and can be used for a long time. In addition, if a hindered amine compound is used, the friction coefficient can be further suppressed to a low level even after a long-term heat history, and can be used for a longer period of time. In addition, if a synthetic oil containing a phosphate derivative or the like is used, the friction coefficient can be further suppressed to a low level even after a long-term heat history, and can be used for a long time even at high temperatures.

Claims

1. An industrial oil composition comprising: a mineral oil or a synthetic oil as a base oil, a neutral phosphite derivative represented by the following formula (B) as an antioxidant, and a 2,6-di-tert-butylphenol derivative represented by the following formula (C), The synthetic oil comprises a phosphate ester derivative, tri(isopropylphenyl) phosphate and triphenyl phosphate, The phosphate derivative has a repeating unit represented by the following formula (A1), has a structure represented by the following formula (A2) at one end, has a structure represented by the following formula (A3) at the other end, and has a kinematic viscosity at 40° C. of 100 cSt to 200 cSt, The triphenyl phosphate is contained in an amount of 1.5% to 92.15% by mass, when the total amount of the synthetic oil is 100% by mass. In the formula (B), R b21 ~R b24 Each independently represents an aliphatic hydrocarbon group having 10 to 16 carbon atoms, and R b25 ~R b28 Each independently represents a linear or branched alkyl group having 1 to 6 carbon atoms, and R b291 and R b292 Each independently represents a hydrogen atom or a linear or branched alkyl group having 1 to 5 carbon atoms, and R b291 and R b292 The total number of carbon atoms is 1 to 5, In the formula (C), R c1 is a linear or branched alkyl group having 1 to 12 carbon atoms, 2. The industrial oil composition according to claim 1, wherein When the total amount of the synthetic oil is 100 mass %, the triphenyl phosphate is contained in an amount of 23.6 mass % to 92.15 mass %.

3. The industrial oil composition according to claim 1, wherein The phosphate ester derivative is contained in an amount of 50% by mass or less, when the total amount of the synthetic oil is 100% by mass, further comprising a hindered amine compound represented by the following formula (D) as the antioxidant, In the formula (D), R d21 and R d22 Each independently represents an aliphatic hydrocarbon group having 1 to 10 carbon atoms, and R d23 It represents a divalent aliphatic hydrocarbon group having 1 to 10 carbon atoms.

4. The industrial oil composition according to claim 1, wherein The base oil is mineral oil, further comprising a hindered amine compound represented by the following formula (D) as the antioxidant, In the formula (D), R d21 and R d22 Each independently represents an aliphatic hydrocarbon group having 1 to 10 carbon atoms, and R d23 It represents a divalent aliphatic hydrocarbon group having 1 to 10 carbon atoms.

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