CN114945654A - Grease composition - Google Patents

Grease composition Download PDF

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Publication number
CN114945654A
CN114945654A CN202180008972.3A CN202180008972A CN114945654A CN 114945654 A CN114945654 A CN 114945654A CN 202180008972 A CN202180008972 A CN 202180008972A CN 114945654 A CN114945654 A CN 114945654A
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Prior art keywords
compound
grease composition
carbon atoms
present
acid
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CN202180008972.3A
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Chinese (zh)
Inventor
矢野敬规
田中启司
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Shell Internationale Research Maatschappij BV
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Shell Internationale Research Maatschappij BV
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/06—Mixtures of thickeners and additives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M115/00—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof
    • C10M115/08—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing nitrogen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/16—Amides; Imides
    • C10M133/18—Amides; Imides of carbonic or haloformic acids
    • C10M133/20—Ureas; Semicarbazides; Allophanates
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
    • C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
    • C10M141/10—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic phosphorus-containing compound
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/003—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
    • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/04—Ethers; Acetals; Ortho-esters; Ortho-carbonates
    • C10M2207/0406—Ethers; Acetals; Ortho-esters; Ortho-carbonates used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/08—Amides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/10—Amides of carbonic or haloformic acids
    • C10M2215/102—Ureas; Semicarbazides; Allophanates
    • C10M2215/1026—Ureas; Semicarbazides; Allophanates used as thickening material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/28—Amides; Imides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/049—Phosphite
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/02—Viscosity; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/02—Bearings
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Semi-solids; greasy

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)

Abstract

The invention provides a grease which is used for lubricating a mechanical element inserted into a reciprocating sliding ball and can keep the anti-stripping performance of the mechanical element inserted into the reciprocating sliding ball even under high load. Accordingly, the present invention provides a grease composition comprising a base oil (a), a diurea compound (b), an amide compound (c) and a thiophosphoric acid compound or a thiophosphoric acid ester compound (d),wherein the diurea compound (b) includes a compound R represented by the formula (1) 1 ‑NHCONH‑R 2 ‑NHCONH‑R 3 (1) Wherein R is 1 And R 3 Represents an acyclic aliphatic hydrocarbon group having 8 to 20 carbon atoms, and R 2 Represents a diphenylmethyl group.

Description

Grease composition
Technical Field
The present invention relates to a grease composition.
Background
Mechanical elements between which the reciprocating sliding ball is inserted include a linear guide, a ball screw, and a constant velocity joint, and their use environments are various. Rolling and sliding of mechanical elements can occur simultaneously and the lubrication environment can be harsh. Under these conditions, contact between the surfaces of the rolling elements is likely to occur, and wear or seizure may occur when the contact is significant.
In order to prevent wear and seizure and to protect mechanical elements, extreme pressure agents are often added to lubricants such as lubricating oils and greases. Well known extreme pressure agents include sulfur-based extreme pressure agents, phosphorus-based extreme pressure agents, sulfur-phosphorus-based organic compounds, and molybdenum compounds. Among these extreme pressure agents, organic extreme pressure agents are particularly popular because of their excellent extreme pressure properties and are now widely used in lubricating oil compositions.
For example, JP200111481A discloses a grease composition for sliding constant velocity joints, which comprises a urea-based thickener, molybdenum sulfide dialkyldithiocarbamate, molybdenum disulfide, sulfur-phosphorus based extreme pressure agent such as zinc dithiophosphate or thiophosphate, and fatty acid amide, to improve the lubricity of parts that are prone to wear and may cause problems such as abnormal vibration. According to this document, although the occurrence of the induced thrust in the constant velocity joint causes problems such as a reduction in the durability of the constant velocity joint, abnormal vibration of the vehicle, and a reduction in the riding comfort, the use of the technique disclosed in this patent document can reduce wear, suppress vibration, and improve durability.
JP2003321694a discloses a technique in which a grease composition contains a urea-based thickener and an organic sulfonate to prevent metal fatigue flaking due to thinning of an oil film despite an attempt to thicken the oil film, and to prolong the flaking life due to metal fatigue.
JP200382374A discloses a technique in which a rolling bearing grease composition contains a urea-based thickener and benzotriazole and/or a derivative to prevent metal fatigue flaking due to thinning of the oil film despite attempts to thicken the oil film, and to prolong the flaking service life.
JP2008239687A discloses a technique wherein a bearing grease composition comprises a urea-based thickener, an alkyl thiophosphate compound and an aliphatic amine.
JP201725189A discloses a technique wherein a grease composition comprising a urea thickener, molybdenum dithiocarbamate, zinc dithiocarbamate and zinc sulfonate prevents metal-to-metal contact in lubrication and forms and maintains an additive film that reduces friction even under high speed/high surface pressure conditions.
The lubricant and grease compositions in JP200111481A, JP2003321694A, JP200382374, JP2008239687 and JP201725189A exhibit good wear resistance and film forming ability under specific conditions or for specific machine elements, but a composition capable of stably maintaining the overall balance between wear resistance and film forming ability in the process has not yet provided reciprocating sliding under various high loads. In particular, the effect of the reciprocating sliding on the flaking under various high loads has not been studied and may be insufficient.
In view of such circumstances, an object of the present invention is to maintain and improve the service life of mechanical parts even in the case where rolling is temporarily stopped during reversal of reciprocating sliding, an oil film cannot be sufficiently generated, metal-to-metal contact occurs, and frictional wear tends to be excessive. It is also an object of the present invention to form a strong additive film, stably maintain the formed film even with repeated operations, and provide stable lubricity. That is, an object of the present invention is to provide a grease composition which can be used for lubricating a machine element into which a reciprocating sliding ball is inserted, and which can maintain spalling resistance even under a high load.
Disclosure of Invention
The present inventors have conducted intensive studies to achieve the above object and, as a result, have found that a grease composition containing an amide-based compound, a thiophosphoric acid compound or a thiophosphate compound and a specific diurea compound can be used for a mechanical component having a reciprocating sliding ball interposed therebetween to improve the flaking resistance. The present invention is a product of this discovery. Specifically, the present invention is as follows.
Aspect (1) of the present invention is a grease composition comprising a base oil (a), a diurea compound (b), an amide compound (c), and a thiophosphoric acid compound or a thiophosphoric acid ester compound (d), wherein the diurea compound (b) includes a compound represented by formula (1)
R 1 -NHCONH-R 2 -NHCONH-R 3 (1)
Wherein R is 1 And R 3 Represents an acyclic aliphatic hydrocarbon radical having 8 to 20 carbon atoms, and R 2 Represents a diphenylmethyl group.
Aspect (2) of the present invention is the grease composition according to aspect (1) of the present invention, wherein the diurea compound (b) includes R in formula 1 wherein 1 And R 3 A diurea compound (b) having an acyclic aliphatic hydrocarbon group of 8 to 12 carbon atoms or an acyclic aliphatic hydrocarbon group of 14 to 20 carbon atoms.
Aspect (3) of the present invention is the grease composition according to aspect (1) or (2) of the present invention, further comprising a saturated or unsaturated fatty acid having 4 to 18 carbon atoms or a metal salt thereof (e).
Embodiment (4) of the present invention is the grease composition according to any one of embodiments (1) to (3) of the present invention, further containing an amine compound (f) represented by formula (2)
R 4 -NH-R 5 -NH 2 (2)
Wherein R is 4 Represents a saturated or unsaturated hydrocarbon group having 5 to 18 carbon atoms, and R 5 Represents a saturated or unsaturated hydrocarbon group having 2 to 3 carbon atoms.
Mode (5) of the present invention is the grease composition according to any one of modes (1) to (4) of the present invention, wherein the amide-based compound (c) comprises an amide-based compound (c) represented by formula (3) or formula (4)
R 6 -CO-NH 2 (3)
R 6 -CO-NH-R 7 -NH-CO-R 6 (4)
Wherein R is 6 Represents a saturated or unsaturated alkyl group having 15 to 17 carbon atoms, and R 7 Represents a methylene group or an ethylene group.
(6) of the present invention is the grease composition according to any one of (1) to (5) of the present invention, wherein the phosphorothioate compound comprises a phosphorothioate compound represented by formula (5), and the phosphorothioate compound comprises a phosphorothioate compound represented by formula (6)
(R 8 S) 3 P(5)
(R 9 O) 3 PS (6)
Wherein R is 8 Represents a saturated or unsaturated hydrocarbon group having 8 to 18 carbon atoms or an aryl group having 6 to 18 carbon atoms, and wherein R 9 Represents a saturated or unsaturated hydrocarbon group having 8 to 18 carbon atoms or an aryl group having 6 to 18 carbon atoms.
Drawings
Fig. 1 is a diagram showing an outline of a peel resistance tester.
Detailed Description
The present invention can provide a grease composition which can be used for lubricating a mechanical component into which a reciprocating sliding ball is inserted, and which can maintain the flaking resistance even under high load.
In the present application, the term "hydrocarbon group" refers to a radical obtained by removing a part of hydrogen atoms from a hydrocarbon.
When the name of a compound appears in the present application, the name includes all isomers of the compound.
In the present application, the amine compound forming the diurea compound described below is referred to as a starting amine compound. The starting amine compound and the amine compound (f) may be the same or different. When the amount of the amine compound (f) is referred to in the present specification, the amount does not include the starting amine compound.
The grease composition of the present invention contains a base oil (a), a diurea compound (b), an amide compound (c), and a thiophosphoric acid compound or a thiophosphoric acid ester compound (d).
The diurea compound (b) of the present invention includes a compound represented by the formula (1)
R 1 -NHCONH-R 2 -NHCONH-R 3 (1)
Wherein R is 1 And R 3 Represents an acyclic aliphatic hydrocarbon radical having 8 to 20 carbon atoms, and R 2 Represents a diphenylmethyl group.
The diurea compound (b) in the present invention is usually produced by reacting an isocyanate with a primary amine (starting amine compound). It will be appreciated that the morphology of the thickener fibers in the diurea-based thickener depends on the combination of isocyanate and primary amine (starting amine compound) and that the flow characteristics of the resulting grease composition vary widely.
It is to be understood that the aliphatic urea grease using the diurea compound (b) in formula 1 as the thickener may be a urea grease composed of an alicyclic amine and an aromatic amine or a urea grease composed of a mixture of an aliphatic amine and/or an aromatic amine, and these have different flow characteristics. It will also be appreciated that greases using the diurea compound (b) in formula 1 as a thickener tend to have excellent interference properties at lubricating interfaces and play an important role in protecting mechanical components. It will also be appreciated that greases using the diurea compound (b) of formula 1 as the thickener have good base oil solubility, interfere with the lubricating interface with the base oil, allow the different flow regimes of the fibres to interact, provide good flow behaviour, and impart effective lubricity. It will also be appreciated that these effects are evident in aliphatic urea greases containing unsaturated fatty amines.
Further, the grease composition of the present invention contains a diurea compound (b), an amide compound (c), a thiophosphorous acid (thiophosphite) compound or a thiophosphate compound (d), which has a remarkable effect of improving the flaking resistance as described below, and the addition of a fatty acid or a fatty acid salt and an amine compound (f) different from the starting amine compound for forming the diurea compound (b) has a further effect of improving the flaking resistance of mechanical elements having a reciprocating sliding ball interposed therebetween.
It is also understood that the grease composition supply at the lubricated interface is improved due to the excellent flow characteristics exhibited by the aliphatic diurea based thickener in the fluid lubrication range where the reciprocating sliding speed is high, and this has the effect of thickening the lubricating film, and that, in addition to the lubricating film of the diurea compound (b), the synergistic thickening effect with the urea grease due to the flow characteristics of the amide compound (c) and the fatty acid or fatty acid salt (e) and the adsorption to the metal surface further improves the wear resistance. It is also understood that in the mixed lubrication region and boundary lubrication region where the oil film is near zero near the end point of reciprocation, the thiophosphite compound or thiophosphate compound (d) and the amine compound (f) contained in the grease composition supplied in large amounts to the lubricated interface are adsorbed on the metal surface due to the excellent flow characteristics of the grease, and the strong coating layer formed at the interface due to the tribochemical reaction has good anti-flaking properties.
The grease composition of the present invention contains a base oil (a). The base oil (a) used in the present invention is not particularly limited within a range not to impair the effects of the present invention. The base oil (a) may be a mineral oil, a synthetic oil, an animal oil or a vegetable oil, or any mixture thereof. Specific examples are those of groups 1 to 5 of the American Petroleum Institute (API) base oil categories. API base oils are a broad classification of base oil materials defined by the american petroleum institute for the purpose of establishing guidelines for lubricant base oils.
The mineral oil used in the present invention is not particularly limited. However, preferred embodiments include paraffinic or naphthenic mineral oils obtained by applying one or more refining methods such as solvent degassing, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrofinishing, sulfuric acid washing and clay treatment to a lubricating oil fraction obtained by atmospheric distillation and vacuum distillation of crude oil. These may be used alone or in combination of two or more.
The synthetic oil used in the present invention is not particularly limited. However, preferred examples include Polyalphaolefins (PAO) and hydrocarbon synthetic oils (oligomers). PAO is an alpha-olefin homopolymer or copolymer. The α -olefin is a compound having a C — C double bond at the terminal, and specific examples include butene, butadiene, hexene, cyclohexene, methylcyclohexene, octene, nonene, decene, dodecene, tetradecene, hexadecene, octadecene, and eicosene. Examples of hydrocarbon synthetic oils (oligomers) include ethylene, propylene and isobutylene homopolymers or copolymers. These may be used alone or in combination of two or more. These compounds may have any isomer structure as long as they have a C-C double bond at the terminal, and may have a branched structure or a linear structure. Also, two or more of these structural isomers and positional isomers having a double bond may be used in combination. Among these olefins, a linear olefin having 6 to 30 carbon atoms is particularly preferably used because when the number of carbon atoms is five or less, the flash point is low, and when the number of carbon atoms is 31 or more, the viscosity is high and the olefin is not practical.
In the present invention, a liquefied Gas (GTL) base oil, which can be used as the base oil (a), is synthesized by using a fischer-tropsch process for converting natural gas into liquid fuels. GTL base oils have very low sulfur and aromatics content and very high paraffin component ratios compared to mineral base oils refined from crude oil. As a result, it has excellent oxidation stability and extremely low evaporation loss, and is very suitable as the base oil (a) in the present invention.
The grease composition of the present invention contains a diurea compound (b) represented by formula (1)
R 1 -NHCONH-R 2 -NHCONH-R 3 (1)
Wherein R is 1 And R 3 Represents an acyclic aliphatic hydrocarbon radical having 8 to 20 carbon atoms, and R 2 Represents a diphenylmethyl group.
R 1 And R 3 Can be any acyclic aliphatic hydrocarbon group, and can be a linear or branched, saturated or unsaturated aliphatic hydrocarbon group. R is 1 And R 3 May have the same structure or different structures.
The diurea compound (b) of the present invention can be obtained by the reaction of the following formula (7).
NCO-R 2 -OCN+R 1 -NH 2 +R 3 -NH 2 →R 1 -NHCONH-R 2 -NHCONH-R 3 (7)
R 1 And R 3 Preferably an acyclic aliphatic hydrocarbon group having 8 to 12 carbon atoms or an acyclic aliphatic hydrocarbon group having 14 to 20 carbon atoms. More preferably, R 1 And R 3 One is an acyclic aliphatic hydrocarbon group having 8 to 12 carbon atoms, and the other is an acyclic aliphatic hydrocarbon group having 14 to 20 carbon atoms. When R is 1 And R 3 With these structures, a grease composition having better wear resistance and spalling resistance can be obtained.
The diurea compound (b) of the present invention may be used alone or in combination of two or more.
The grease composition of the present invention contains an amide compound (c). The amide-based compound (c) used in the present invention is not particularly limited as long as the effect of the present invention is not impaired. Preferred examples of the amide-based compound (c) usable in the present invention are an aliphatic amide-based compound represented by the following formula (3) or an aliphatic bisamide-based compound represented by the following formula (4). When the amide-based compound (c) has one of these structures, a grease composition having better wear resistance and spalling resistance can be obtained.
R 6 -CO-NH 2 (3)
R 6 -CO-NH-R 7 -NH-CO-R 6 (4)
Wherein R is 6 Represents a saturated or unsaturated hydrocarbon group having 15 to 17 carbon atoms, and R 7 Represents a methylene group or an ethylene group.
Specific examples of the aliphatic amide-based compound and the aliphatic bisamide-based compound include palmitamide, palmitoleimide, heptadecanoic acid amide, stearic acid amide, oleic acid amide, octadecenoic acid amide, linoleic acid amide, linolenic acid amide, eleostearic acid amide, arachidic acid amide, eicosadienoic acid amide, melissic acid amide, arachidonic acid amide, erucic acid amide, behenic acid amide, methylenebispalmitamide, methylenebisheptadecanoic acid amide, methylenebisstearamide, methylenebisoleamide, methylenebislinoleamide, methylenebislinolenic acid amide, methylenebiseleostearic acid amide, ethylenebispalmitamide, ethylenebisheptadecylamide, ethylenebisstearamide, and the like, Ethylene bis-oleamide, ethylene bis-octadecenoic acid amide, ethylene bis-linoleic acid amide, ethylene bis-linolenic acid amide, and ethylene bis-eleostearic acid amide. These may be used alone or in combination of two or more.
The grease composition of the present invention contains a thiophosphoric acid compound or a thiophosphoric acid ester compound (d). The thiophosphoric acid compound or thiophosphoric acid ester compound (d) used in the present invention is not particularly limited as long as the effect of the present invention is not impaired. The thiophosphoric acid compound may also be combined with a thiophosphate compound.
The phosphorothioate compound or phosphorothioate compound (d) used in the present invention is preferably a phosphorothioate compound represented by the following formula (5) or a phosphorothioate compound represented by the following formula (6). When the thiophosphate compound or the thiophosphate compound has one of these structures, a grease composition having better wear resistance and spalling resistance can be obtained.
(R 8 S) 3 P(5)
R 8 Represents a saturated or unsaturated hydrocarbon group having 8 to 18 carbon atoms or an aryl group having 6 to 18 carbon atoms.
(R 9 O) 3 PS (6)
R 9 Represents a saturated or unsaturated hydrocarbon group having 8 to 18 carbon atoms or an aryl group having 6 to 18 carbon atoms.
Specific examples of the thiophosphoric acid compound and the thiophosphate compound (d) include alkyl thiophosphites such as trilauryl trithiophosphite and aromatic thiophosphates such as triphenyl thiophosphate. When alkylthiophosphorous acid is used, a grease composition having better wear resistance and spalling resistance can be obtained. These may be used alone or in combination of two or more.
The grease composition of the present invention may further contain any of the following components. When the grease composition of the present invention contains the fatty acid or its metal salt (e) or the amine compound (f), better wear resistance and flaking resistance can be obtained. When the grease composition of the present invention contains the fatty acid or its metal salt (e) and the amine compound (f), even better wear resistance and flaking resistance can be obtained.
The grease composition of the present invention may contain a fatty acid or a metal salt thereof (e). The fatty acid or metal salt thereof (e) used in the present invention is not particularly limited as long as the effect of the present invention is not impaired. The fatty acid or metal salt thereof used in the present invention is preferably a saturated or unsaturated fatty acid having 4 to 18 carbon atoms or a metal salt thereof. When the grease composition of the present invention contains a fatty acid or its metal salt (e), even better wear resistance and flaking resistance can be obtained.
Specific examples of the fatty acid include butyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, lauric acid, myristic acid, pentadecanoic acid, palmitic acid, mandelic acid, stearic acid, crotonic acid, myristoleic acid, palmitoleic acid, sapienoic acid, oleic acid, linoleic acid, linolenic acid, pinolenic acid, octadecatrienoic acid, octadecatetraenoic acid, and eicosapentaenoic acid. These may be used alone or in combination of two or more. Unsaturated fatty acids are preferred from the viewpoint of obtaining a grease composition having excellent wear resistance and spalling resistance because they are more easily adsorbed on metal surfaces than saturated fatty acids. As for the carbon number, a larger carbon number is more preferable. Oleic acid is one example of such a fatty acid.
The metal element for forming a salt with these fatty acids is not particularly limited as long as the effect of the present invention is not impaired. Specific examples of the metal element include alkali metals such as lithium, sodium, potassium, rubidium, and cesium; beryllium; magnesium; alkaline earth metals such as calcium, strontium and barium; aluminum; and zinc. These may be used alone or in combination of two or more. Among them, calcium salts and aluminum salts are preferable from the viewpoint of obtaining a grease composition having excellent wear resistance and spalling resistance.
The grease composition of the present invention may contain an amine compound (f). The amine compound (f) used in the present invention is not limited as long as the effect of the present invention is not impaired. The amine compound (f) used in the present invention is preferably an amine compound represented by the following formula 2. When the grease composition of the present invention contains such an amine compound, even better wear resistance and spalling resistance can be obtained.
R 4 -NH-R 5 -NH 2 (2)
R 4 Represents a saturated or unsaturated hydrocarbon group having 5 to 18 carbon atoms, R 5 Represents a saturated or unsaturated hydrocarbon group having 2 to 3 carbon atoms.
Specific examples of the amine-based compound (f) include N-cocoalkyl-1, 2-ethylenediamine, N-tallowalkyl-1, 2-ethylenediamine, N-hardened tallow alkyl-1, 2-ethylenediamine, N-cocoalkyl-1, 3-propanediamine, N-tallowalkyl-1, 3-propanediamine, N-hardened tallow alkyl-1, 3-propanediamine, N-coconut alkyl-1, 4-butanediamine, N-tallowalkyl-1, 4-butanediamine and N-hardened tallow alkyl-1, 4-butanediamine. These may be used alone or in combination of two or more. Among these, N-tallowalkyl-1, 3-propanediamine is preferred from the viewpoint of obtaining a grease composition having excellent wear resistance and spalling resistance.
The grease composition of the present invention may contain a thickener (other thickener) other than the urea compound, in addition to the (urea group) thickener. Examples of other thickeners include tricalcium phosphate, alkali metal soap, alkali metal complex soap, alkaline earth metal complex soap, alkali metal sulfonate, alkaline earth metal sulfonate, other metal soap, terephthalic acid metal salt, monourea, polyurea other than triurea monocarbamate, diurea, or tetraurea, clay, silica (silica) such as silica aerogel, and fluorine resins such as polytetrafluoroethylene. These may be used alone or in combination of two or more. In addition to these thickeners, any substance which can impart a viscosity effect to a liquid substance can be used. When any of the above-mentioned fatty acids or metal salts thereof (e) is used, the fatty acid or metal salt thereof (e) may double as a thickener. When the fatty acid or its metal salt (e) doubles as a thickener, the amount to be used may be different from that of the above-mentioned fatty acid or its metal salt (e).
The grease composition of the present invention may contain additives such as an antioxidant, an antirust agent, an oiliness agent, an extreme pressure agent, an antiwear agent, a solid lubricant, a metal deactivator, a polymer, a non-metal detergent, a colorant, a water repellent, etc., as long as they do not impair the present invention. These may be used alone or in combination of two or more.
Examples of the antioxidant include 2, 6-di-t-butyl-4-methylphenol, 2, 6-di-t-butyl-p-cresol, p' -dioctyldiphenylamine, N-phenyl-alpha-naphthylamine and phenothiazine.
Examples of rust inhibitors include oxidized paraffins, metal carboxylates, metal sulfonates, carboxylic acid esters, sulfonic acid esters, salicylic acid esters, succinic acid esters, sorbitan esters, and various amine salts.
Examples of the oiliness agent, the extreme pressure agent, and the antiwear agent include zinc dialkyldithiophosphate sulfide, zinc diallyldithiophosphate sulfide, zinc dialkyldithiocarbamate, diallyldithiocarbamate sulfide, molybdenum dialkyldithiophosphate, molybdenum diallyldithiophosphate sulfide, molybdenum dialkyldithiocarbamate sulfide, molybdenum diallyldithiocarbamate sulfide, organic molybdenum complex, olefin sulfide, triphenyl phosphite, triphenyl thiophosphate, tricresyl phosphite, other phosphates, and sulfurized grease.
Examples of solid lubricants include molybdenum disulfide, graphite, boron nitride, melamine cyanurate, Polytetrafluoroethylene (PTFE), tungsten disulfide, and graphite fluoride. Examples of metal deactivators include N, N' -disalicylidene-1, 2-diaminopropane, benzotriazole, benzimidazole, benzothiazole, and thiadiazole. Examples of polymers include polybutylene, polyisobutylene, polyisoprene, and polymethacrylates.
One example of a non-metallic detergent is succinimide.
The method of producing the grease composition of the present invention is not particularly limited. However, the grease composition of the present invention may be prepared by weighing the individual raw materials and mixing them together using any known method. As for the amount of the optional components to be added, the above-mentioned amount can be used as required.
The base oil (a) is used in an amount of preferably 70 to 98% by mass, more preferably 75 to 97% by mass, and further preferably 80 to 95% by mass, relative to 100% by mass of the total grease composition.
The diurea compound (b) in the present invention is used in an amount of preferably 1 to 25% by mass, more preferably 3 to 20% by mass, and further preferably 5 to 15% by mass, relative to 100% by mass of the total grease composition. When a thickener other than the diurea compound (b) is added, the total amount of the diurea compound (b) and the thickener other than the diurea compound (b) is preferably 2 to 50% by mass, more preferably 4 to 40% by mass, and even more preferably 6 to 30% by mass, relative to 100% by mass of the total grease composition. When the amount of the diurea compound (b) is within this range, the grease composition has a hardness suitable for grease, does not flow out from the lubrication sites, has excellent interference properties at the lubrication interface, and obtains desired lubrication properties.
The amount of the amide-based compound (c) used in the present invention is preferably 0.1 to 10% by mass, more preferably 0.2 to 5% by mass, and further preferably 0.3 to 3% by mass, relative to 100% by mass of the total grease composition.
The thiophosphoric acid compound or thiophosphoric acid ester compound (d) in the present invention is used in an amount of preferably 0.1 to 10% by mass, more preferably 0.2 to 5% by mass, and further preferably 0.3 to 3% by mass, relative to 100% by mass of the total grease composition.
The amount of the fatty acid or its metal salt (e) used in the present invention is preferably 0.1 to 10% by mass, more preferably 0.2 to 5% by mass, and further preferably 0.3 to 3% by mass, relative to 100% by mass of the total grease composition.
The amount of the amine compound (f) used in the present invention is preferably 0.1 to 10% by mass, more preferably 0.2 to 5% by mass, and further preferably 0.3 to 3% by mass, relative to 100% by mass of the total grease composition.
The amount of any additional additive used per 100 parts by mass of the total grease composition is preferably 0.1 to 20 parts by mass.
The consistency of the grease composition of the present invention ranges from number 2 to number 0 (265 to 385), preferably from number 4 to 00 (175 to 430), more preferably from number 3 to number 0 (220 to 385), even more preferably from number 2 to number 1 (265 to 340). The consistency represents the physical hardness of the grease. The method used here for measuring consistency is JIS K22207 in "grease consistency test method".
The dropping point is not related to the performance of the grease composition of the present invention, but is preferably 180 ℃ or higher as an index of the original binding force of the urea grease thickener structure. With increasing temperature, the dropping point is the temperature at which the grease loses its thickener structure. The dropping point was measured by the "method for measuring the dropping point of grease" in JIS K22208.
The grease composition of the present invention can be naturally used for machines, bearings, gears, ball screws, and the like, and can exhibit excellent grease lubricating performance even under severe environments. It is suitable for lubricating various automotive components including components around the engine such as water pumps, cooling fan motors, starters, alternators and actuators, as well as drive shafts, Constant Velocity Joints (CVJ), powertrain components such as wheel bearings and clutches, Electric Power Steering (EPS) assemblies, power window assemblies, brakes, ball joints, door hinges, handle assemblies and brake extenders. The grease composition of the present invention is preferably used in construction machines such as excavators, bulldozers, mobile cranes, etc., the steel industry, the paper industry, forestry machines, agricultural machinery, in chemical plants, power generation equipment, and railway cars. Other applications include seamless tubes and threaded joints for outboard motor bearings. The grease composition of the present invention is particularly suitable for these applications.
Drawings
Fig. 1 is a diagram showing an outline of a peel resistance tester. The following sections are labeled as follows:
1: electrical machine
2: rotating shaft
3: crank arm (1)
4: strain gauge
5: crank bending part
6: crank arm (2)
7: mounting and fixing nut
8: key material
9: cone mating part
10: nut
11: collar
12: bearing stop block
13: testing rolling bearing
14: bearing unit
15: load control device
16: auxiliary rolling bearing
17: pendulum shaft
Examples
The following is a more detailed description of the present invention with reference to examples and comparative examples. It is noted, however, that the present invention is not limited to these examples in any way.
Raw material composition
The following raw material components were used in examples and comparative examples.
Base oil (a)
Base oil a: a mineral oil with kinematic viscosity of 99.05mm at 40 deg.C 2 A kinematic viscosity at 100 ℃ of 11.13 mm/s 2 /s。
Base oil B: a mineral oil with kinematic viscosity of 480.2mm at 40 deg.C 2 Has a kinematic viscosity at 100 ℃ of 31.56 mm/s 2 /s。
Base oil C: a highly refined oil having a dynamic viscosity of 43.88mm at 40 DEG C 2 Has a dynamic viscosity of 7.774mm at 100 DEG C 2 (ii)/s, viscosity index of 146,% CA of 1 or less,% CN of 11.9 and% CP of 85 or more.
Base oil D: a poly alpha-olefin oil having a kinematic viscosity of 396.5.3mm at 40 ℃ 2 S, kinematic viscosity at 100 ℃ of 39.99mm 2 /s。
Base oil E: an alkyl diphenyl ether oil with kinematic viscosity of 102.2mm at 40 deg.C 2 S, kinematic viscosity at 100 ℃ of 12.64mm 2 /s。
Diurea compound (b)
The diurea compound (b) is prepared by reacting the following raw materials using the following preparation method.
Bis-urea compound a:
diphenylmethane-4, 4' -diisocyanate (MDI)
Octylamine
Oleylamine
Diurea compound B:
diphenylmethane-4, 4' -diisocyanate (MDI)
Octylamine
Amide compound (c)
Amide compound a: oleic acid amide (oleic acid amide from Japanese lion king chemical products)
Thiophosphoric acid compound and thiophosphoric acid ester compound (d)
Thiophosphoric acid compound a: trilauryl trithiophosphite (JPS-312 from North City Japan chemical industry)
Phosphorothioate compound a: triphenylthiophosphate (Irgalube TPPT from Pasf)
Fatty acid or metal salt thereof (e)
Fatty acid a: oleic acid (NAA-35 from solar oil)
Fatty acid metal salt a: calcium stearate (calcium stearate GP from solar oil)
Fatty acid metal salt B: aluminum stearate (aluminum stearate from solar oil 300)
Amine compound (f)
Amine compound a: n-tallow alkyl-1, 3-propane diamine (Lipomin DA-T from Japan lion king chemical)
Example 1
After the base oil and MDI were heated in a vessel to dissolve the contents, a raw material mixture in which octylamine, oleylamine and base oil were dissolved and mixed was added to the vessel, and a diurea compound A was synthesized by reaction. The temperature was raised to 170 ℃ with stirring and maintained at this temperature for about 30 minutes to complete the reaction. Then, the mixture was frozen, and various additives were added in the proportions shown in table 1 during cooling, mixed while stirring, cooled to 80 ℃, and passed through a homogenizer to obtain grease.
Examples 2 to 18, comparative examples 1 to 5
Grease compositions were prepared in the same manner as in example 1, except that the raw materials mixed together were as those shown in tables 1 to 4. The diurea compound B was prepared by changing the starting materials in the diurea compound a to those listed above.
Evaluation of grease compositions
The following measurements and tests were conducted in order to compare the characteristics and properties of the examples and comparative examples.
The working penetration and the non-working penetration of the grease compositions in examples and comparative examples were measured according to "grease consistency test method" in JIS K22207. The results are shown in tables 1 to 4 below.
The dropping point of the grease compositions in examples and comparative examples was measured according to "grease dropping point test method" in JIS K22208. The results are shown in tables 1 to 4 below.
In the bearing flaking and wear tests, the grease compositions in the examples and comparative examples were evaluated for wear resistance and spalling resistance. The results are shown in tables 1 to 4 below. The following is a description of the evaluation method. Fig. 1 is a schematic view showing a bearing peeling and wear testing machine. The weight of a clean test rolling bearing (7205 angular contact ball bearing) was measured in advance, and 3g of a grease composition was applied to the bearingAnd loaded into a bearing spalling wear tester. Then, the nut of the swing shaft is fixed with a tightening torque of 600kg · m, and a thrust load is applied to the shaft by the tightening torque. Next, a radial load of 1.0 ton was applied to each bearing using a hydraulic piston. The motor is started and the oscillating shaft reciprocates at a frequency of 1.7 Hz. After the oscillating operation for 20 hours, the bearing was taken out of the apparatus and washed with a solvent such as n-hexane to completely remove the grease composition. And measuring the weight of the clean bearing after the test, and calculating the weight difference relative to the weight of the bearing before the test to obtain the bearing abrasion loss. The bearing wear amount after the test and the areas of the sliding surfaces of the inner ring and the outer ring where the flaking occurred were measured to evaluate whether the grease composition was acceptable. The pass/fail decision is based on the area where spalling occurred. When the area is less than 50mm 2 When the grease composition is used, the grease composition is qualified. When the area is larger, the grease composition fails. The area where the peeling occurred was determined by observing and specifying the portion where the peeling occurred under a digital microscope (VHX-6000 from keyence), and then the area was measured.
Test conditions
And (3) testing a bearing: 7205 number (angular ball bearing)
Amount of lubricating grease: 3.0g
Oscillation: 1.7Hz
Thrust load: 600Kg m
Radial load: 1.0 ton
Temperature: 25 deg.C
Time: 20 hours
Evaluation results
Working penetration, dropping point and bearing spalling and wear tests were performed according to the method described above. The properties of each grease are shown in tables 1 to 4 below. The grease compositions in the examples had a consistency of 0 to No. 2, and the grease compositions of the comparative examples had a consistency of 2 to No. 2.5. The dropping point of the grease compositions of examples and comparative examples at 240 ℃ or higher was comparable to that of urea grease. Results of the most important of the present invention, bearing flaking and wear tests, the grease compositions of the present invention were all acceptable, had a wear capacity of less than 150mg,total area of exfoliation less than 50mm 2 . In the case of the grease compositions of comparative examples, bearing wear amount bearing flaking and wear test were significant, and the total flaking area of the inner ring and outer ring sliding surfaces exceeded 50mm 2 And the test is failed.
TABLE 1
Figure BDA0003741336630000141
TABLE 2
Figure BDA0003741336630000151
TABLE 3
Figure BDA0003741336630000161
TABLE 4
Figure BDA0003741336630000171

Claims (6)

1. A grease composition comprising a base oil (a), a diurea compound (b), an amide compound (c), and a thiophosphoric acid compound or a thiophosphate compound (d), wherein the diurea compound (b) includes a compound represented by formula (1)
R 1 -NHCONH-R 2 -NHCONH-R 3 (1)
Wherein R is 1 And R 3 Represents an acyclic aliphatic hydrocarbon radical having 8 to 20 carbon atoms, and R 2 Represents a diphenylmethyl group.
2. The grease composition according to claim 1, wherein the diurea compound (b) comprises R in formula 1 1 And R 3 A diurea compound (b) which is an acyclic aliphatic hydrocarbon group having 8 to 12 carbon atoms or an acyclic aliphatic hydrocarbon group having 14 to 20 carbon atoms.
3. A grease composition according to claim 1 or 2, further containing a saturated or unsaturated fatty acid having 4 to 18 carbon atoms or a metal salt thereof (e).
4. The grease composition according to any one of claims 1 to 3, further comprising an amine compound (f) represented by formula (2)
R 4 -NH-R 5 -NH 2 (2)
Wherein R is 4 Represents a saturated or unsaturated hydrocarbon group having 5 to 18 carbon atoms, and R 5 Represents a saturated or unsaturated hydrocarbon group having 2 to 3 carbon atoms.
5. The grease composition according to any one of claims 1 to 4, wherein the amide-based compound (c) comprises an amide-based compound (c) represented by formula (3) or formula (4)
R 6 -CO-NH 2 (3)
R 6 -CO-NH-R 7 -NH-CO-R 6 (4)
Wherein R is 6 Represents a saturated or unsaturated alkyl group having 15 to 17 carbon atoms, and R 7 Represents a methylene group or an ethylene group.
6. A grease composition according to any one of claims 1 to 5, wherein the thiophosphoric acid compound comprises a thiophosphoric acid compound represented by formula (5) and the thiophosphate compound comprises a thiophosphate compound represented by formula (6)
(R 8 S) 3 P(5)
(R 9 O) 3 PS (6)
Wherein R is 8 Represents a saturated or unsaturated hydrocarbon group having 8 to 18 carbon atoms or an aryl group having 6 to 18 carbon atoms, andin R 9 Represents a saturated or unsaturated hydrocarbon group having 8 to 18 carbon atoms or an aryl group having 6 to 18 carbon atoms.
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