WO2014054797A1 - グリース組成物 - Google Patents
グリース組成物 Download PDFInfo
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- WO2014054797A1 WO2014054797A1 PCT/JP2013/077138 JP2013077138W WO2014054797A1 WO 2014054797 A1 WO2014054797 A1 WO 2014054797A1 JP 2013077138 W JP2013077138 W JP 2013077138W WO 2014054797 A1 WO2014054797 A1 WO 2014054797A1
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- constant velocity
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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
- C10M169/06—Mixtures of thickeners and additives
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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
- 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
- C10M141/08—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 sulfur-, selenium- or tellurium-containing compound
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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
- C10M169/02—Mixtures of base-materials and thickeners
-
- 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
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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
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/14—Synthetic waxes, e.g. polythene waxes
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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
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/18—Natural waxes, e.g. ceresin, ozocerite, bees wax, carnauba; Degras
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/40—Fatty vegetable or animal oils
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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
- 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
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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
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
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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
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
- C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
- C10M2219/066—Thiocarbamic type compounds
- C10M2219/068—Thiocarbamate metal salts
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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
- C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
- C10M2227/06—Organic compounds derived from inorganic acids or metal salts
- C10M2227/066—Organic compounds derived from inorganic acids or metal salts derived from Mo or W
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- 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
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- 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
- C10N2030/76—Reduction of noise, shudder, or vibrations
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- 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
- C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
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- 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
Definitions
- the present invention relates to a grease composition for a constant velocity joint (CVJ).
- CVJ constant velocity joint
- An extremely high surface pressure is generated in the constant velocity joint portion to be lubricated, and the joint portion is subjected to a complicated rolling and sliding action. For this reason, abnormal vibrations often occur.
- the present invention relates to a grease composition for a constant velocity joint that can efficiently lubricate such a constant velocity joint and effectively reduce the coefficient of friction to prevent vibrations.
- the present invention also relates to a grease composition that can improve the durability of the constant velocity joint by suppressing wear of the lubrication part.
- Such greases include base oils, urea thickeners, molybdenum disulfide, and calcium oxide waxes, calcium sulfonates of petroleum sulfonic acids, calcium salts of alkyl aromatic sulfonic acids, calcium salts of salicylates, calcium phenates.
- the present invention has been made in order to cope with such a problem.
- the lubrication part is further provided.
- An object of the present invention is to provide a grease composition in which the durability of a constant velocity joint is improved by reducing the wear of the metal and suppressing the occurrence of flaking due to metal fatigue.
- the present inventors have conducted various researches and developments on grease compositions that reduce the friction of constant velocity joints and prevent vibrations, and evaluate the performance of greases used for stool under lubrication conditions where vibrations are likely to occur.
- An SRV tester known as a tester was used.
- the grease composition having the following components not only significantly prevented the occurrence of vibration but also improved the durability life of the constant velocity joint, thereby completing the present invention. It came to do.
- Grease composition containing the following components (a) to (e): (A) base oil, (B) a thickener; (C) montan wax, (D) zinc sulfonate, and (e) molybdenum dialkyldithiocarbamate sulfide. 2.
- R 3 —NH—CO—NH—C 6 H 4 —p—CH 2 —C 6 H 4 —p—NH—CO—NHR 4
- R 3 and R 4 are independently selected from the group consisting of an alkyl group having 8 to 20 carbon atoms, an aryl group having 6 to 12 carbon atoms, and a cycloalkyl group having 6 to 12 carbon atoms; May be different.
- the grease composition according to the above 1 or 2 further comprising (f) an oil containing 70% by mass or more of a C18 fatty acid glyceride. 4).
- the content of each component in the entire composition is (A) Base oil 37 to 97.25% by mass, (B) Thickener 1-25% by mass, (C) Montan wax 0.1-5% by mass, (D) 0.1-15% by weight of zinc sulfonate, (E) Molybdenum dialkyldithiocarbamate 0.1 to 10% by mass, (F) 0.1 to 5% by mass of fats and oils containing 70% by mass or more of C18 fatty acid glycerides, and (g) 0.05 to 3% by mass of sulfur-phosphorus extreme pressure additive 5.
- the grease composition according to any one of 1 to 5 above, wherein the grease composition is for a constant velocity joint. 7).
- the grease composition according to 6 above, wherein the constant velocity joint is a sliding type constant velocity joint.
- the grease composition of the present invention can efficiently lubricate the constant velocity joint, effectively reduce the coefficient of friction, and remarkably prevent the occurrence of vibration. Moreover, the durable life of a constant velocity joint can be improved by suppressing wear of the lubrication part.
- the grease composition of the present invention contains the following components (a) to (e): (A) base oil, (B) a thickener; (C) montan wax, (D) zinc sulfonate, and (e) molybdenum dialkyldithiocarbamate sulfide.
- Examples of the base oil of the component (a) include commonly used lubricating oils such as mineral oils, ether-based synthetic oils, ester-based synthetic oils and hydrocarbon-based synthetic oils, or mixed oils thereof. It is not limited to. From the viewpoint of cost, it is preferable to use a mineral oil, and it is preferable to use a base oil in which a mineral oil is a main component and a synthetic oil is mixed.
- the kinematic viscosity of the base oil at 100 ° C. is preferably 5 to 30 mm 2 / s, more preferably 7 to 20 mm 2 / s.
- the content of the base oil is preferably 37 to 97.25% by mass, more preferably 70 to 90% by mass.
- thickeners known as grease thickeners can be used.
- thickeners include lithium soap, calcium soap, soap-based thickeners represented by sodium soap, lithium complex soap, calcium complex soap, aluminum complex soap, and complex soaps represented by calcium sulfonate complex soap.
- a diurea thickener represented by the following formula is used.
- R 3 NH—CO—NH—C 6 H 4 —p—CH 2 —C 6 H 4 —p—NH—CO—NHR 4
- R 3 and R 4 are independently an alkyl group having 8 to 20 carbon atoms, preferably 8 to 18 carbon atoms, an aryl group having 6 to 12 carbon atoms, preferably 6 to 7 carbon atoms, and 6 to 6 carbon atoms. 12 and preferably selected from the group consisting of cycloalkyl groups having 6 to 7 carbon atoms, which may be the same or different.
- the diurea thickener can be obtained, for example, by reacting a predetermined diisocyanate with a predetermined monoamine.
- diisocyanate is diphenylmethane-4,4′-diisocyanate.
- monoamines include aliphatic amines, aromatic amines, alicyclic amines, and mixtures thereof.
- Aliphatic amines include alkylamines having 8 to 18 carbon atoms, such as octylamine, dodecylamine, hexadecylamine, octadecylamine and oleylamine.
- aromatic amines include aniline and p-toluidine.
- alicyclic amines include cyclohexylamine.
- the content of the thickener is preferably 1 to 25% by mass, more preferably 5 to 15% by mass. If the amount is less than 1% by mass, the thickening effect may be reduced, making it difficult to form a grease. If the amount exceeds 25% by mass, the obtained composition may be too hard to obtain the desired effect. Therefore, it is preferable to be within the above range.
- the component (c) montan wax is a general term for mineral waxes based on montanic acid obtained by refining and oxidizing brown coal as a raw material.
- Applications include applications such as electrical insulating agents, coating agents, carbon paper, and release agents.
- Examples of commercially available products include Montan wax manufactured by Client, for example, acid waxes such as Licowax U and Licowax S, ester waxes such as Licowax E and Licowax WE40, and partially saponified ester waxes such as Licowax OP and Licowax O.
- the content of the montan wax is preferably 0.1 to 15% by mass, more preferably 0.1 to 5% by mass, and still more preferably 0.3 to 5% by mass.
- the zinc sulfonate of the above component (d) is obtained by sulfonation of aromatic hydrocarbon components in the lubricating oil fraction, which is known as a metal-based detergent dispersant and rust preventive used in lubricating oils such as engine oils. It is done.
- the base value of these zinc sulfonates is preferably 50 mgKOH / g or less, more preferably 40 mgKOH / g or less.
- Preferred zinc sulfonates include, for example, zinc salts of dinonylnaphthalene sulfonic acid having a base number of 50 mgKOH / g or less.
- the content of the zinc sulfonate is preferably 0.1 to 15% by mass, more preferably 1 to 10% by mass. If it is less than 0.1% by mass, it may be difficult to obtain the desired effect, and even if the content exceeds 15% by mass, the effect may not increase. It is preferable.
- the molybdenum sulfide dialkyldithiocarbamate as the component (e) is preferably a molybdenum dialkyldithiocarbamate sulfide represented by the following formula.
- the content of the molybdenum disulfide dialkyldithiocarbamate is preferably 0.1 to 15% by mass, more preferably 0.1 to 10% by mass, and still more preferably 0.5 to 5% by mass. If it is less than 0.1% by mass, it may be difficult to obtain the desired effect, and even if it is contained in an amount exceeding 15% by mass, especially 5% by mass, the effect may not increase. It is preferable to be within the above range.
- the grease composition of the present invention preferably further contains an oil and fat containing 70% by mass or more of the component (f) C18 fatty acid glyceride. Fats and oils containing 70% by mass or more of C18 fatty acid glycerides adsorb on the metal surface to prevent contact between metals and reduce friction.
- castor oil content of C18 fatty acid glycerides: 98.5 mass%), olive oil (content of C18 fatty acid glycerides: 83.5) Rapeseed oil (content of carbon number C 18 fatty acid glyceride: 75.6% by mass), sesame oil (content of carbon number C 18 fatty acid glyceride: 89.4% by mass), etc., especially castor oil Is preferred.
- the oil content is preferably 0.1 to 5% by mass, more preferably 0.5 to 5% by mass. If it is less than 0.1% by mass, it may be difficult to obtain the desired effect, and even if contained in excess of 5% by mass, the effect may not increase. Is preferred.
- the grease composition of the present invention preferably further contains a component (g) a sulfur-phosphorus extreme pressure agent.
- Preferred sulfur-phosphorus extreme pressure agents are those having a sulfur content of 15 to 35% by weight and a phosphorus content of 0.5 to 3% by mass.
- the content of the sulfur-phosphorus extreme pressure agent is preferably 0.05 to 3% by mass, more preferably 0.1 to 1% by mass. If it is less than 0.05% by mass, it will be difficult to obtain the effect of wear resistance, and even if it is contained in excess of 1% by mass, the effect may not increase. preferable.
- the grease composition of the present invention further includes oiliness agents, antioxidants, rust inhibitors and polymer additives generally used in various lubricating oils and greases. Can be added.
- additives such as extreme pressure agents, friction modifiers, antiwear agents and solid lubricants can be added.
- the content thereof is preferably 0.1 to 10% by mass in the total mass of the grease composition.
- the grease composition of the present invention has a consistency of preferably 220 to 385, more preferably 265 to 340.
- the grease composition of the present invention exhibits its performance most effectively when used as a grease composition for a constant velocity joint, preferably a sliding type constant velocity joint. Needless to say, it can be used for lubrication.
- the present invention will be described in more detail with reference to examples. Needless to say, the scope of the present invention is not limited to such examples.
- Examples 1 to 6 and Comparative Examples 1 to 20 455 g of base oil and 43.6 g of diphenylmethane-4,4′-diisocyanate were placed in a container and the mixture was heated to 70-80 ° C. In a separate container, 455 g of base oil, 27.6 g of cyclohexylamine and 18.8 g of stearylamine were taken, heated to 70-80 ° C., added to the previous container, and allowed to react for 30 minutes with good stirring. Thereafter, the temperature was raised to 160 ° C. while stirring, and after cooling, a base urea grease was obtained.
- Table 1 shows Examples 1 to 6, and Tables 2 to 5 show Comparative Examples 1 to 20.
- Comparative example 20 is a commercially available urea grease containing MoDTC (manufactured by Kyodo Yushi).
- surface is as follows, and the number in a table
- MoDTC Molybdenum dialkyldithiocarbamate (((C 4 H 9 ) 2 N—CS—S) 2 —Mo 2 O 2 S 2 )
- Zinc sulfonate zinc dinonylnaphthalene sulfonate (base number 2.8 mg KOH / g)
- sulfur-phosphorus extreme pressure additive sulfur content 31.5 mass%, phosphorus content 1.7 mass%
- Fat B rapeseed oil (carbon number C 18 fatty acid glyceride: 75.6%)
- Fat and oil C Palm oil ( C18 fatty acid glyceride: 55.1%)
- Joint type Tripport type constant velocity joint Measurement item Joint forcing force was measured and evaluated with a rate of change (%) based on commercially available grease. Endurance life test Test condition Rotation speed: 200rpm Torque: 1000Nm Angle: 7 ° Joint type: Triport type constant velocity joint Criteria Flaking time of each part of the inboard joint (outer ring, trunnion, roller, needle) ⁇ : 500h or more ⁇ : Less than 500h
- the grease composition of the present invention contains (a) base oil, (b) thickener, (c) montan wax, (d) zinc sulfonate, and (e) molybdenum dialkyldithiocarbamate sulfide. Therefore, as can be seen from the results of the examples and comparative examples, the SRV test results have a low coefficient of friction and wear resistance, and the CVJ test results prevent vibrations and greatly increase the durability life. It can be seen that there is an improvement.
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- Oil, Petroleum & Natural Gas (AREA)
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- Organic Chemistry (AREA)
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Abstract
Description
近年、自動車の高出力化や高性能化がますます進み、車の乗り心地の向上や静粛性の要求が大きくなり、等速ジョイントから発生する振動の低減や経時的な振動の低減がより求められる傾向にある。しかし、現行の等速ジョイント用グリース組成物では、経時的な振動の低減に対しては要求を満足できないという問題があり、さらなる持続的な静粛性が求められている。
1.下記の成分(a)~(e)を含有するグリース組成物:
(a)基油、
(b)増ちょう剤、
(c)モンタンワックス、
(d)亜鉛スルホネート、及び
(e)硫化ジアルキルジチオカルバミン酸モリブデン。
2.成分(b)の増ちょう剤が次式で表されるジウレア系増ちょう剤である、上記1記載のグリース組成物。
R3-NH-CO-NH-C6H4-p-CH2-C6H4-p-NH-CO-NHR4
(R3及びR4は、独立して、炭素数8~20のアルキル基、炭素数6~12のアリール基及び炭素数6~12のシクロアルキル基からなる群より選ばれ、同一であっても異なっていてもよい。)
3.さらに(f)炭素数C18脂肪酸グリセリドを70質量%以上含む油脂を含有する上記1又は2記載のグリース組成物。
4.さらに(g)硫黄-リン系極圧添加剤を含有する上記1~3のいずれか1項記載のグリース組成物。
5.全組成物中における各成分の含有量が、
(a)基油 37~97.25質量%、
(b)増ちょう剤 1~25質量%、
(c)モンタンワックス 0.1~5質量%、
(d)亜鉛スルホネート 0.1~15質量%、
(e)硫化ジアルキルジチオカルバミン酸モリブデン 0.1~10質量%、
(f)炭素数C18脂肪酸グリセリドを70質量%以上含む油脂0.1~5質量%、及び
(g)硫黄-リン系極圧添加剤 0.05~3質量%
である上記1~4のいずれか1項記載のグリース組成物。
6.グリース組成物が等速ジョイント用である、上記1~5のいずれか1項記載のグリース組成物。
7.等速ジョイントが摺動型等速ジョイントである、上記6記載のグリース組成物。
本発明のグリース組成物は、下記成分(a)~(e)を含有する:
(a)基油、
(b)増ちょう剤、
(c)モンタンワックス、
(d)亜鉛スルホネート、及び
(e)硫化ジアルキルジチオカルバミン酸モリブデン。
上記基油の100℃における動粘度は、好ましくは5~30mm2/sであり、より好ましくは7~20mm2/sである。5mm2/s未満では、等速ジョイント(CVJ)内で油膜を形成せず高速耐久性が不充分となる傾向があり、30mm2/sを超えるとCVJ内の発熱のため高速耐久性が低下する傾向がある。
上記基油の含有量は、好ましくは37~97.25質量%、より好ましくは70~90質量%である。
R3-NH-CO-NH-C6H4-p-CH2-C6H4-p-NH-CO-NHR4
(R3及びR4は、独立して、炭素数8~20、好ましくは炭素数8~18のアルキル基、炭素数6~12、好ましくは炭素数6~7のアリール基及び炭素数6~12、好ましくは炭素数6~7のシクロアルキル基からなる群より選ばれ、同一であっても異なっていてもよい。)
上記ジウレア系増ちょう剤は、例えば、所定のジイソシアネートと所定のモノアミンとを反応させることにより得ることができる。ジイソシアネートの好ましい具体例は、ジフェニルメタン-4,4’-ジイソシアネートである。モノアミンとしては、脂肪族系アミン、芳香族アミン、脂環式アミン又はこれらの混合物が挙げられる。脂肪族系アミンとしては、炭素数8~18のアルキルアミン、例えばオクチルアミン、ドデシルアミン、ヘキサデシルアミン、オクタデシルアミン及びオレイルアミンが挙げられる。芳香族アミンの具体例としては、アニリン及びp-トルイジンが挙げられる。脂環式アミンの具体例としては、シクロヘキシルアミンが挙げられる。上記ジイソシアネートとモノアミンとを反応させる方法には特に制限はなく、従来公知の方法により実施することができる。
オクチルアミン、アクタデシルアミン及びシクロヘキアミン又はこれらの混合物を用いて得られる成分(b)のジウレア系増ちょう剤が好ましい。
上記増ちょう剤の含有量は、好ましくは1~25質量%、より好ましくは5~15質量%である。1質量%未満であると、増ちょう効果が少なくなり、グリース化しにくくなる場合があり、25質量%を越えると、得られた組成物が硬くなりすぎ所期の効果が得られなくなる場合があるので、上記範囲内とすることが好ましい。
上記モンタンワックスの含有量は、好ましくは0.1~15質量%、より好ましくは0.1~5質量%、さらに好ましくは0.3~5質量%である。0.1質量%未満であると、耐久寿命を向上させる効果を得ることが困難になる場合があり、15質量%、特に5質量%を越えて含有させても効果の増大がない場合があるので、上記範囲内とすることが好ましい。
上記亜鉛スルホネートの含有量は、好ましくは0.1~15質量%、さらに好ましくは1~10質量%である。0.1質量%未満であると、所期の効果を得ることが困難になる場合があり、15質量%を越えて含有させても効果の増大がない場合があるので、上記範囲内とすることが好ましい。
(R1R2N-CS-S)2-Mo2OmSn
(式中、R1及びR2は、独立して、炭素数1~24、好ましくは炭素数2~18のアルキル基を表し、mは0~3、nは4~1であり、m+n=4である。)
上記硫化ジアルキルジチオカルバミン酸モリブデンの含有量は、好ましくは0.1~15質量%、より好ましくは0.1~10質量%、さらに好ましくは0.5~5質量%である。0.1質量%未満であると、所期の効果を得ることが困難になる場合があり、15質量%、特に5質量%を越えて含有させても効果の増大がない場合があるので、上記範囲内とすることが好ましい。
上記油脂の含有量は、好ましくは0.1~5質量%、さらに好ましくは0.5~5質量%である。0.1質量%未満であると、所期の効果を得ることが困難になる場合があり、5質量%を越えて含有させても効果の増大がない場合があるので上記範囲内とすることが好ましい。
上記硫黄-リン系極圧剤の含有量は、好ましくは0.05~3質量%、さらに好ましくは0.1~1質量%である。0.05質量%未満であると、耐摩耗性の効果を得ることが困難になり、1質量%を越えて含有させても効果の増大がない場合があるので、上記範囲内とすることが好ましい。
本発明のグリース組成物は、ちょう度が好ましくは220~385であり、より好ましくは265~340である。
なお、本発明のグリース組成物は、等速ジョイント、好ましくは摺動型等速ジョイント用グリース組成物として使用した場合にその性能を最も効果的に発揮するが、等速ジョイント以外の潤滑部位の潤滑に使用できることはいうまでもない。
以下、本発明を実施例により更に詳細に説明する。なお、本発明の範囲は、かかる実施例に限定されないことはいうまでもない。
容器に基油455gとジフェニルメタン-4,4’-ジイソシアネート43.6gをとり、混合物を70~80℃に加熱した。別容器に基油455gとシクロヘキシルアミン27.6g及びステアリルアミン18.8gをとり、70~80℃に加熱後、先の容器に加え、よく攪拌しながら、30分間反応させた。その後攪拌しながら、160℃まで昇温し、放冷後、ベースウレアグリースを得た。このベースグリースに、表1に示す配合で、添加剤を添加し、適宜基油を加え、得られる混合物を三段ロールミルにて、ちょう度No. 1 グレードに調整した。
グリースの基油として、以下の特性を有する鉱油を使用した。
粘度 40℃ 102mm2/s
100℃ 11.2mm2/s
粘度指数 88
比較例20は市販のMoDTCを含有するウレアグリースである(協同油脂製)。
なお、表中に示す各成分は以下のとおりであり、表中の数字は質量%を示す。
MoDTC:硫化ジアルキルジチオカルバミン酸モリブデン(((C4H9)2N-CS-S)2-Mo2O2S2)
亜鉛スルホネート:ジノニルナフタレンスルホン酸亜鉛(塩基価2.8mgKOH/g)硫黄-リン系極圧添加剤:硫黄含有量31.5質量%、リン含有量1.7質量%
油脂A:ひまし油(炭素数C18脂肪酸グリセリド:98.5%)
油脂B:なたね油(炭素数C18脂肪酸グリセリド:75.6%)
油脂C:パーム油(炭素数C18脂肪酸グリセリド:55.1%)
ワックスA:モンタンワックス
ワックスB:脂肪酸アミド系ワックス
ワックスC:ポリエチレンワックス
<ちょう度>
JIS K 2220.7 による。
<SRV摩擦摩耗試験>
テストピース ボール :直径17.5mm(SUJ2)
プレート:直径24mm×7.85mm(SUJ2)
試験条件 荷重 :200N
周波数 :50Hz
振幅 :0.8mm
時間 :30分
試験温度:40℃
測定項目 摩擦係数(μ)及び試験後の摩耗痕径
<CVJ試験>
強制力試験
下記条件にて実ジョイントでの強制力試験を行い、強制力を測定した。
試験条件 回転数:200rpm
トルク:700Nm
ジョイント角度:15°
運転時間:2min.
ジョイントタイプ:トリポート型等速ジョイント
測定項目 ジョイント強制力を測定し、市販グリースを基準として増減率(%)で評価した。
耐久寿命試験
試験条件 回転数:200rpm
トルク:1000Nm
角度:7°
ジョイントタイプ:トリポート型等速ジョイント
判定基準 インボードジョイント各部(外輪・トラニオン・ローラー・ニードル)のフレーキングの発生時間
○:500h以上
×:500h未満
本発明のグリース組成物は、(a)基油、(b)増ちょう剤、(c)モンタンワックス、(d)亜鉛スルホネート及び(e)硫化ジアルキルジチオカルバミン酸モリブデンを含有しているため、実施例及び比較例の結果からもわかるように、SRV試験結果からは、摩擦係数が低く、耐摩耗特性を有しており、CVJ試験結果からは振動発生を防止し、耐久寿命が大幅に向上していることがわかる。
Claims (6)
- 下記の成分(a)~(e)を含有する等速ジョイント用グリース組成物:
(a)基油、
(b)増ちょう剤、
(c)モンタンワックス、
(d)亜鉛スルホネート、及び
(e)硫化ジアルキルジチオカルバミン酸モリブデン。 - 成分(b)の増ちょう剤が次式で表されるジウレア系増ちょう剤である、請求項1記載のグリース組成物。
R3-NH-CO-NH-C6H4-p-CH2-C6H4-p-NH-CO-NHR4
(R3及びR4は、独立して、炭素数8~20のアルキル基、炭素数6~12のアリール基及び炭素数6~12のシクロアルキル基からなる群より選ばれ、同一であっても異なっていてもよい。) - さらに(f)炭素数C18脂肪酸グリセリドを70質量%以上含む油脂を含有する請求項1又は2記載のグリース組成物。
- さらに(g)硫黄-リン系極圧添加剤を含有する請求項1~3のいずれか1項記載のグリース組成物。
- 全組成物中における、(c)モンタンワックスの含有量が0.1~15質量%であり、(d)亜鉛スルホネートの含有量が0.1~15質量%であり、(e)硫化ジアルキルジチオカルバミン酸モリブデンの含有量が0.1~10質量%である、請求項1~4のいずれか1項記載のグリース組成物。
- 等速ジョイントが摺動型等速ジョイントである、請求項1~5のいずれか1項記載のグリース組成物。
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CN201380062477.6A CN104822811B (zh) | 2012-10-05 | 2013-10-04 | 润滑脂组合物 |
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Cited By (5)
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CN107532103A (zh) * | 2015-03-31 | 2018-01-02 | Gkn动力传动系统国际有限责任公司 | 用于等速万向接头的润滑脂组合物 |
EP3187572A4 (en) * | 2014-08-29 | 2018-01-24 | Kyodo Yushi Co., Ltd. | Grease composition |
JP2018168221A (ja) * | 2017-03-29 | 2018-11-01 | 新日鐵住金株式会社 | ころがり軸受用グリース組成物 |
KR20230110495A (ko) | 2020-11-26 | 2023-07-24 | 교도유시 가부시끼가이샤 | 등속 조인트용 그리스 조성물 |
WO2023190513A1 (ja) * | 2022-03-28 | 2023-10-05 | 協同油脂株式会社 | グリース組成物及び前記グリース組成物を充填したラックアンドピニオン式ステアリング装置 |
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JP6841595B2 (ja) * | 2015-12-25 | 2021-03-10 | 協同油脂株式会社 | 減速機用潤滑剤組成物及び減速機 |
JP6605367B2 (ja) * | 2016-03-10 | 2019-11-13 | 協同油脂株式会社 | 等速ジョイント用グリース組成物及び等速ジョイント |
CN106281237B (zh) * | 2016-08-18 | 2020-03-24 | 中国工程物理研究院化工材料研究所 | 二脲基蜡类聚集体及其制备方法 |
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EP0773280B1 (en) | 1995-11-13 | 2002-10-09 | Kyodo Yushi Co., Ltd. | Grease composition for constant velocity joints |
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WO2008040383A1 (en) * | 2006-10-07 | 2008-04-10 | Gkn Driveline International Gmbh | Grease composition for use in constant velocity joints comprising at least one tri-nuclear molybdenum compound and a urea derivative thickener |
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EP3187572A4 (en) * | 2014-08-29 | 2018-01-24 | Kyodo Yushi Co., Ltd. | Grease composition |
US10876065B2 (en) | 2014-08-29 | 2020-12-29 | Kyodo Yushi Co., Ltd. | Grease composition |
CN107532103A (zh) * | 2015-03-31 | 2018-01-02 | Gkn动力传动系统国际有限责任公司 | 用于等速万向接头的润滑脂组合物 |
JP2018510947A (ja) * | 2015-03-31 | 2018-04-19 | ゲーカーエン ドライブライン インターナショナル ゲゼルシャフト ミト ベシュレンクテル ハフツングGkn Driveline International Gmbh | 等速ジョイント用グリース組成物 |
JP2018168221A (ja) * | 2017-03-29 | 2018-11-01 | 新日鐵住金株式会社 | ころがり軸受用グリース組成物 |
KR20230110495A (ko) | 2020-11-26 | 2023-07-24 | 교도유시 가부시끼가이샤 | 등속 조인트용 그리스 조성물 |
WO2023190513A1 (ja) * | 2022-03-28 | 2023-10-05 | 協同油脂株式会社 | グリース組成物及び前記グリース組成物を充填したラックアンドピニオン式ステアリング装置 |
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