WO2015129897A1

WO2015129897A1 - Lubricating oil composition for machine assembly

Info

Publication number: WO2015129897A1
Application number: PCT/JP2015/055985
Authority: WO
Inventors: 実男篠田; 矢野　昭彦; 三治松岡
Original assignee: 出光興産株式会社
Priority date: 2014-02-28
Filing date: 2015-02-27
Publication date: 2015-09-03
Also published as: JP2019206728A; JP6875020B2; JP2015178616A

Abstract

In order to provide, within the field of lubricating oils for machine assembly, a lubricating oil composition for machine assembly, said composition not causing damage when a machine starts to idle, having a low friction coefficient, exhibiting anti-rust performance, and not tending to cause sludge when mixed with the lubricating oil that is used, this lubricating oil composition for machine assembly is formed by blending (A) a viscosity index improver and (B) an anti-rust agent, and is configured to have a kinematic viscosity of 1500-7000 mm²/s at 40 °C.

Description

Lubricating oil composition for machine assembly

The present invention relates to a lubricating oil composition for machine assembly.

Conventionally, when assembling a machine having a rotary shaft-bearing structure, in order to lubricate the contact portion between the rotary shaft and the bearing, it is generally applied in advance to the rotating body and the bearing with gear lubricant. Has been done.
However, in extremely large machines such as steam turbines, gas turbines, and wind power generation used for thermal power generation, when assembling rotating bodies and gears to bearings, turbine oil, gear oil, and compressor oil are used as they are. Since the viscosity of the lubricating oil is lower than the size of the rotating body and the bearing, the rotating body and the bearing may be damaged when the machine is idling after the assembly is completed.

In order to suppress the damage, a method of separately preparing a lubricating oil for assembly of a machine having extremely high viscosity can be considered in order to apply to a rotating body or a bearing at the time of assembly. However, in this case, the lubricating oil for assembly of the machine has a problem that the coefficient of friction becomes high and rust prevention performance cannot be obtained.
Further, after the machine is idling, it is necessary not to be separated from the lubricating oil used such as turbine oil, gear oil, compressor oil or the like. When separated, there has been a problem of sedimentation in the oil tank constituting the circulation system of the apparatus and in the lubricating oil retention portion of the piping. Further, the accumulated matter deposits and causes sludge, which significantly deteriorates the performance of the used lubricating oil and clogs the circulation system.
Therefore, the present invention has a low friction coefficient and has a rust prevention performance in the field of lubricating oil for assembly of a machine applied when assembling a rotating body to a bearing. And it aims at providing the lubricating oil composition for the assembly | attachment of the machine which is hard to produce sludge when mixed with the used lubricating oil.

As a result of intensive studies, the inventor has found that the above problem can be solved by using a lubricating oil composition containing a viscosity index improver and a rust inhibitor and having a specific kinematic viscosity. .
That is, the present invention provides the following.
1. A lubricating oil composition for assembly of a machine comprising (A) a viscosity index improver and (B) a rust inhibitor and having a kinematic viscosity at 40 ° C. of 1500 to 7000 mm ² / s.
2. 2. The lubricating oil composition for assembling a machine according to 1 above, wherein the viscosity index improver (A) is blended in an amount of 30% by mass or more.
3. 3. The machine according to 1 or 2 above, wherein the (A) viscosity index improver comprises one or more selected from a poly (meth) acrylate polymer, an ethylene-α-olefin copolymer, and a polyα-olefin polymer. Lubricating oil composition for assembly.
4). Any of (1) to (3) above, wherein (B) the rust inhibitor is at least one selected from a rust inhibitor bonded to polyoxyalkylene, a rust inhibitor having an alkenyl group, and a rust inhibitor having an alkyl group. A lubricating oil composition for assembling a machine according to claim 1.
5. 5. The lubricating oil composition for assembling a machine according to any one of 1 to 4 above, wherein the metal content based on the total amount of the composition is 0.01% by mass or less.
6). 6. The lubricating oil composition for assembling a machine according to any one of 1 to 5 above, further comprising a friction modifier.
7). 7. The lubricating oil composition for assembling a machine according to any one of 1 to 6 above, further comprising an antioxidant.

According to the present invention, in the field of lubricating oil for assembly of machines, no damage occurs when idling, low friction coefficient, rust prevention performance, and sludge when mixed with used lubricating oil. It is possible to provide a lubricating oil composition for machine assembly that is unlikely to occur.

[Lubricating oil composition for machine assembly]
The lubricating oil composition for assembly of a machine of the present invention (hereinafter sometimes abbreviated as “the lubricating oil composition of the present invention”) comprises (A) a viscosity index improver and (B) a rust inhibitor. It is blended and has a kinematic viscosity at 40 ° C. of 1500 to 7000 mm ² / s.
In the present invention, for example, a composition defined as “a composition formed by blending the component (A) and the component (B)” is only “a composition containing the component (A) and the component (B)”. And “a composition containing a modified product in which the component is modified instead of at least one of the component (A) and the component (B)” or “the component (A) and the component (B) react. Also included are “compositions comprising the resulting reaction product”.

The lubricating oil composition of the present invention is a kinematic viscosity of 1500 ~ 7000mm ² / s at 40 ° C., preferably from 3000 ~ 6000mm ² / s, more preferably 3000 ~ 5000mm ² / s. If the kinematic viscosity at 40 ° C. of the lubricating oil composition is less than 1500 mm ² / s, seizure may occur when starting the machine, and if it exceeds 7000 mm ² / s, the friction coefficient may increase. is there.
Furthermore, the lubricating oil composition for assembly of a machine of the present invention preferably has a pour point of −35 ° C. or lower, more preferably −40 ° C. or lower, and further preferably −45 ° C. or lower. . When the pour point of the lubricating oil composition exceeds −35 ° C., there is a risk that the viscosity becomes high when used outdoors, making it difficult to handle, and increasing the coefficient of friction.

[(A) Viscosity index improver]
As described above, the lubricating oil composition of the present invention has a very low kinematic viscosity while having a low friction coefficient. From the viewpoint of realizing such characteristics, the lubricating oil composition of the present invention has (A) a viscosity index improver, and (A) it contains 30% by mass or more of the viscosity index improver. The content is preferably 50% by mass or more, more preferably 90% by mass or less.
As said (A) viscosity index improver, what diluted the polymer with mineral oil etc. is also contained.
The (A) viscosity index improver preferably contains one or more selected from poly (meth) acrylate polymers, ethylene-α-olefin copolymers and polyα-olefin polymers.
As the poly (meth) acrylate polymer, polyalkyl methacrylate is preferable.
Further, the examples of (A) a viscosity index improver, preferably 40 ° C. kinematic viscosity of ^{^{3000mm 2 / s ~ 100000mm 2 /}} s, more preferably ^{4000mm 2 / s ~ 90000mm 2 /} s, 4000mm More preferably, it is ² / s to 50000 mm ² / s.
Further, the (A) viscosity index improver preferably has a polystyrene-equivalent weight average molecular weight (Mw) of 10,000 to 500,000, preferably 20,000 to 250,000, as measured by gel permeation chromatography (GPC). More preferably, it is more preferably 50,000 to 150,000.

In addition, the lubricating oil composition of the present invention preferably contains 3 to 50% by mass of mineral oil, more preferably 5 to 30% by mass, and more preferably 7 to 20% by mass from the viewpoint of viscosity adjustment and the like. More preferably.
As the mineral oil, for example, a lubricating oil fraction obtained by atmospheric distillation of paraffinic, intermediate-based, or naphthenic crude oil or by distillation under reduced pressure of residual oil of atmospheric distillation is used as a solvent removal solvent. Isomerized by one or more treatments such as extraction, hydrocracking, solvent dewaxing, hydrorefining, etc., or waxes produced by mineral oils, Fischer-Tropsch processes, etc. Base oils produced by doing so.
Among such mineral oils, those having a kinematic viscosity at 40 ° C. of 10 to 200 mm ² / s are preferably used, and those having a kinematic viscosity at 40 ° C. of 20 to 100 mm ² / s are more preferable.

[(B) Rust preventive]
Various antirust agents can be used as the antirust agent (B) to be blended in the lubricating oil composition of the present invention. From the viewpoint of washing dispersibility, one or more selected from those having a polyoxyalkylene bonded thereto, those having an alkenyl group, and those having an alkyl group are preferred. The rust preventive agent which does not contain is more preferable.
Specific examples include succinimides, ashless rust preventives such as alkenyl succinimides and alkenyl succinic acid esters, fatty acids such as stearic acid, dicarboxylic acids, (short Chain) Alkenyl succinic acids, partial esters thereof and nitrogen-containing derivatives thereof, various amine compounds, alkyl sulfonates, polyhydric alcohol esters (for example, partial carboxylic acid esters such as sorbitan monooleate), fatty acid amines, oxidized paraffins Nonionic polyoxyalkylene agents (for example, polyoxyethylene lauryl ether, polyoxyethylene higher alcohol ether, polyoxyethylene nonyl phenyl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene octyl stearyl ether, polyoxyethylene Ciethylene oleyl ether, polyoxyethylene sorbitol monostearate, polyoxyethylene sorbitol monooleate, and polyethylene glycol monooleate), phosphorous compounds such as phosphoric acid esters, sulfonic acid compounds, etc., and alkenyl succinic acid esters Are preferred, and alkenyl succinic polyhydric alcohol esters are particularly preferred.
As said (B) rust preventive agent, the thing containing the mineral oil for dilution etc. is also contained.
The lubricating oil composition of the present invention preferably contains 0.01 to 3.0% by mass of (B) a rust inhibitor, more preferably 0.05 to 2.0% by mass, and 0.10. More preferably, it is contained in an amount of ˜1.0 mass%.

Furthermore, it is preferable that the lubricating oil composition of the present invention does not substantially contain an additive containing a metal atom. For example, the metal content based on the total amount of the composition is preferably 0.01% by mass or less.

The lubricating oil composition of the present invention may further comprise other additives. Specific examples of the additives include antioxidants, antiwear agents, friction modifiers, friction modifiers, Pour point depressants, antifoaming agents, extreme pressure agents, thickeners, metal deactivators and the like can be mentioned.

(Antioxidant)
Various known antioxidants can be used as the antioxidant blended in the lubricating oil composition of the present invention.
Specifically, 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,6-diphenol Monophenols such as -tert-butyl-4- {4,6-bis (octylthio) -1,3,5-triazin-2-ylamino} phenol, 4,4'-methylenebis (2,6-di-tert -Butylphenol), 2,2'-methylenebis (4-ethyl-6-tert-butylphenol) and other diphenol antioxidants, alkylated diphenylamine, amine-based antioxidants such as alkylated phenyl-α-naphthylamine, phosphones Examples thereof include phosphorus antioxidants such as acid esters.

(Antiwear agent)
Various known antiwear agents can be used as the antiwear agent blended in the lubricating oil composition of the present invention. Specifically, for example, inorganic or organic molybdenum compounds such as molybdenum disulfide, organic boron compounds such as alkyl mercaptyl borate; graphite, antimony sulfide, boron compounds, polytetrafluoroethylene and the like can be exemplified.

(Friction modifier)
Various known friction modifiers can be used as the friction modifier to be blended in the lubricating oil composition of the present invention. Specifically, for example, an amine compound, fatty acid amide, which has at least one alkyl group or alkenyl group having 6 to 30 carbon atoms, particularly a linear alkyl group or linear alkenyl group having 8 to 24 carbon atoms in the molecule, Examples thereof include fatty acid metal salts. Examples of the amine compound include aliphatic (poly) amines having a linear or branched alkyl group or alkenyl group, or alkylene oxide adducts thereof.

(Friction modifier)
Examples of friction modifiers to be blended in the lubricating oil composition of the present invention include alkoxylated aliphatic amines; boronated aliphatic epoxides; aliphatic phosphorous acid, aliphatic epoxides, aliphatic amines, and boronated alkoxylated aliphatic amines. Fatty acid metal salts, fatty acid amides, glycerol esters, boronated glycerol esters; and aliphatic imidazolines as disclosed in US Pat. No. 6,372,696; 4 to 75 carbons, preferably 6 to 24 carbons, and more Preferably, a reaction product of a compound selected from the group consisting of a fatty acid ester having 6 to 20 carbon atoms and a phosphate ester and a nitrogen-containing compound selected from the group consisting of ammonia and an alkanolamine is used. Most preferred are salts.
When the lubricating oil composition of the present invention contains a friction modifier, the content is preferably 0.01 to 1.0% by mass, more preferably 0.02 to 0.50% by mass. And more preferably 0.03 to 0.10% by mass.

(Pour point depressant)
Various known pour point depressants can be used as the pour point depressant to be blended in the lubricating oil composition of the present invention. Specifically, for example, polymethacrylate, polyalkylstyrene, alkylnaphthalene and the like can be exemplified.

(Defoamer)
Various known antifoaming agents can be used as the antifoaming agent blended in the lubricating oil composition of the present invention. Specific examples include silicone oil compounds such as alkyl methacrylate polymers, dimethylsiloxane, silica gel dispersion, and dimethylsilicone polymers, alcohol-based or ester-based compounds, and the like.

(Extreme pressure agent)
Various known extreme pressure agents can be used as the extreme pressure agent blended in the lubricating oil composition of the present invention.
Specifically, for example, sulfur extreme pressure agents such as sulfides, sulfoxides, sulfones, thiophosphinates, thiocarbonates, sulfurized fats and oils, sulfurized olefins; phosphoric acid esters, phosphorous acid esters, phosphoric acid esters Examples thereof include phosphoric acids such as amine salts and phosphite amines; halogen compounds such as chlorinated hydrocarbons, and the like.

(Thickener)
Examples of the thickener blended in the lubricating oil composition of the present invention include polyurea acetate and lithium stearate.

[Assembly method of rotating shaft]
The method of assembling the rotating shaft according to the present invention includes a step of applying the lubricating oil composition for assembly of the machine to the rotating body and the bearing, a step of assembling the rotating body to the bearing, and an actual operation between the rotating shaft and the bearing. A process of rotating the rotating shaft while supplying the lubricating oil composition to be used in the process is performed.

The assembling method of the present invention is particularly useful when assembling a large rotating shaft, and specific examples of such a rotating shaft are used in gas turbines, steam turbines, wind power generation, large gears, compressors, and the like. Can be mentioned.

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

<Method for measuring properties>
The properties of lubricating oil compositions in the following examples and comparative examples were measured by the following methods.
(1) Kinematic viscosity Measured according to the method described in JIS K2283.
(2) Viscosity index Measured according to the method described in JIS K2283.
(3) Acid value It measured based on the method as described in JISK2501.
(4) Density The density was measured according to the method described in JIS K2249.
(5) Flash point Measured according to the method described in JIS K2265.
(6) Pour point Measured according to the method described in JIS K2269.

<Evaluation method>
The performance of the lubricating oil compositions in the following examples and comparative examples was evaluated by the following method.
(1) Rust prevention performance It measured based on the method of JISK2510.
(2) Coefficient of friction The friction coefficient was evaluated by a reciprocating drive test of Bowden-Leben.
The evaluation was performed at room temperature, using SUJ2 for the pressing ball, applying a sample using WJ2 white metal alloy (surface roughness Ra 1.0 or less) as the counterpart, load 1.0 kg, sliding speed 1, 2, 4 mm / S.
(3) Adhesion mass SPCC steel plate (60 × 80 × 0.8 mm) whose mass was measured in advance was washed with n-hexane, dipped in the sample for 30 minutes after drying, then removed from the sample, and 1 at 25 ° C. It left still in the state suspended for a week, Then, the mass of the SPCC steel plate which the sample adhered was measured, and the difference with the mass measured in advance was made into adhesion mass.
(4) Oxidation stability It evaluated at 120 degreeC by the method of JISK2514, without putting water.
The sample used was a Daphne Super Turbine MG32 manufactured by Idemitsu Kosan Co., Ltd. with 1.0 mass percent of the lubricating oil for assembly of this machine added. The evaluation was made based on the RPVOT maintenance rate after 1000 hours (RPVOT after evaluation / value obtained by RPVOT × 100 before evaluation) and the amount of sludge.
RPVOT was measured according to the method described in JIS K2514.
The amount of sludge is determined by mass measurement using a membrane filter with a diameter of 0.8 micron, filtering 100 g of sample, washing with 250 ml of n-heptane, drying the membrane filter at 75 ° C. for 60 minutes, cooling. It was.

Examples 1 to 6 and Comparative Examples 1 to 5
Lubricating oil compositions were prepared by blending the base oils and additives shown in Table 1-1 and Table 1-2 in the proportions shown in Table 1-1 and Table 1-2. The composition, properties and performance of the composition are shown in Table 1-1 and Table 1-2.

(A) Viscosity index improver 1: poly (meth) acrylate polymer (solid content: 70% by mass, mineral oil content: 30% by mass, weight average molecular weight (Mw): 69,000)
(A) Viscosity index improver 2: ethylene-propylene copolymer (solid content: 15% by mass, mineral oil content: 85% by mass, weight average molecular weight (Mw): 98,000)
(A) Viscosity index improver 3: Poly (meth) acrylate copolymer (solid content: 65% by mass, mineral oil content: 35% by mass)
(A) Viscosity index improver 4: Styrenic olefin copolymer (solid content: 15% by mass, mineral oil content: 85% by mass, weight average molecular weight (Mw): 700,000)
(A) Viscosity index improver 5: ethylene-propylene copolymer (A) Viscosity index improver 6: ethylene-propylene copolymer (B) Rust inhibitor: alkenyl succinic polyhydric alcohol ester (polyolefin adduct of dodecenyl succinic acid; solid content : 65% by mass, mineral oil content: 35% by mass)
Friction modifier: long-chain phosphate amine amine antioxidant 1: C7-9 alkyl 3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate antioxidant 2: monobutylphenyl monooctylphenyl Amine antioxidant 3: 2,6-ditertiary butylphenol copper Deactivator: N-dialkylaminomethylbenzotriazole

The properties of paraffinic mineral oils 1 to 3, naphthenic mineral oils 1 to 2 and (A) viscosity index improvers 1 to 6 used in Examples 1 to 6 and Comparative Examples 1 to 5 are shown in Table 2 below.

The lubricating oil composition of the present invention is useful when assembling a machine having a large-diameter rotating shaft such as a steam turbine or a gas turbine used for thermal power generation.

Claims

A lubricating oil composition for assembly of a machine comprising (A) a viscosity index improver and (B) a rust inhibitor and having a kinematic viscosity at 40 ° C. of 1500 to 7000 mm 2 / s.
The lubricating oil composition for assembly of a machine according to claim 1, wherein the (A) viscosity index improver is blended in an amount of 30% by mass or more.
The machine according to claim 1 or 2, wherein the (A) viscosity index improver comprises one or more selected from a poly (meth) acrylate polymer, an ethylene-α-olefin copolymer, and a polyα-olefin polymer. Lubricating oil composition for assembly.
The rust inhibitor (B) is at least one selected from a rust inhibitor bonded with polyoxyalkylene, a rust inhibitor having an alkenyl group, and a rust inhibitor having an alkyl group. A lubricating oil composition for assembling a machine according to any one of the above.
The lubricating oil composition for machine assembly according to any one of claims 1 to 4, wherein the metal content based on the total amount of the composition is 0.01% by mass or less.
6. The lubricating oil composition for assembling a machine according to claim 1, further comprising a friction modifier.
The lubricating oil composition for machine assembly according to any one of claims 1 to 6, further comprising an antioxidant.