US20160145522A1 - Grease composition and rolling bearing - Google Patents

Grease composition and rolling bearing Download PDF

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Publication number
US20160145522A1
US20160145522A1 US14/897,266 US201414897266A US2016145522A1 US 20160145522 A1 US20160145522 A1 US 20160145522A1 US 201414897266 A US201414897266 A US 201414897266A US 2016145522 A1 US2016145522 A1 US 2016145522A1
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Prior art keywords
grease composition
calcium stearate
oil
grease
thickener
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US14/897,266
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English (en)
Inventor
Eri WATABE
Yujiro Toda
Kanako TSUMURA
Koichi Hachiya
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NSK Ltd
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NSK Ltd
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Assigned to NSK LTD. reassignment NSK LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HACHIYA, KOICHI, TODA, YUJIRO, TSUMURA, KANAKO, WATABE, ERI
Publication of US20160145522A1 publication Critical patent/US20160145522A1/en
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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
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C10M105/38—Esters of polyhydroxy compounds
    • 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
    • C10M117/00—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof
    • C10M117/02—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen
    • 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
    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/04—Hydroxy compounds
    • C10M129/06—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M129/08—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms containing at least 2 hydroxy groups
    • 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
    • C10M169/04—Mixtures of base-materials 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
    • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
    • 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
    • C10M2207/02—Hydroxy compounds
    • C10M2207/021—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/022—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms containing at least two hydroxy groups
    • 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
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • 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
    • C10M2207/044—Cyclic ethers having four or more ring atoms, e.g. furans, dioxolanes
    • 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
    • C10M2207/1265—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 used as thickening agent
    • 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
    • C10M2207/128—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 containing hydroxy groups; Ethers thereof
    • C10M2207/1285—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 containing hydroxy groups; Ethers thereof used as thickening agents
    • 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
    • C10M2207/28—Esters
    • C10M2207/287—Partial esters
    • C10M2207/289—Partial esters containing free hydroxy groups
    • 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
    • C10M2207/401—Fatty vegetable or animal oils used as base material
    • 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
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/08—Resistance to extreme temperature
    • 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
    • C10N2030/62—Food grade properties
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6633—Grease properties or compositions, e.g. rheological properties

Definitions

  • the present invention relates to a grease composition, particularly, a grease composition which is highly safe to human body and suitable for a food machine, for example.
  • the present invention also relates to a rolling bearing in which the grease composition is sealed.
  • Patent Document 1 describes a grease composition including an edible oil as a base oil and a fatty acid metal salt as a thickener.
  • Patent Document 2 describes a grease composition for food machines, in which a glycerin-derived or propylene glycol-derived glycerin fatty acid ester is included as a base oil and calcium stearate approved as a food additive is included as a thickener.
  • Patent Document 1 JP-A-H11-228983
  • Patent Document 2 JP-A-2009-91502
  • calcium stearate has a problem that since its structure as a thickener is unstable, thickener fibers tend to grow over time in an environment applied with heat, resulting in hardening of a grease composition, and heat resistance is deteriorated.
  • an object of the present invention is to provide a grease composition where a structure of calcium stearate is stabilized, thereby ensuring that an environmental impact is reduced and heat resistance is excellent as well as safety to human body is high.
  • Another object of the present invention is to provide a long-life rolling bearing suitable for food machines, or the like.
  • the present invention provides the following grease composition and rolling bearing.
  • the grease composition of the present invention is a grease composition in which since both the edible oil as the base oil and calcium stearate as the thickener are for food use, the environmental impact is reduced and the safety to human body is high and furthermore, a structure stabilizer is added to enhance the structure stability of calcium stearate, and therefore, high safety and excellent heat resistance are achieved.
  • FIG. 1 is a graph showing results of a static heating test.
  • FIG. 2 is a graph showing results of a seizing durability test.
  • FIG. 3 is a graph showing results of a wear resistance test.
  • FIG. 4 is a graph showing a relationship between an unworked penetration after heating and a seizing durability life.
  • FIG. 5 is a graph showing a relationship between a penetration ratio between before and after heating and a wear resistance ratio.
  • FIG. 6 is a graph showing a relationship between (worked penetration/oil separation) and a wear resistance ratio.
  • the grease composition of the present invention uses an edible oil as a base oil and uses calcium stearate as a thickener.
  • the edible oil as the base oil may be a saturated fatty acid triglyceride which is an ester of a saturated fatty acid and glycerin, soybean oil, rapeseed oil, safflower oil, corn oil, cottonseed oil, sesame oil, olive oil, coconut oil, palm oil, or the like, and may be a mixed oil thereof.
  • other animal/vegetable oils may be appropriately mixed.
  • a saturated fatty acid triglyceride is preferred, and a mixture of a saturated fatty acid triglyceride (C8 saturated fatty acid triglyceride) composed of a saturated fatty acid having a carbon number of 8 and glycerin and a saturated fatty acid triglyceride (C10 saturated fatty acid triglyceride) composed of a saturated fatty acid having a carbon number of 10 and glycerin, or a saturated fatty acid glyceride having mixed in one molecule thereof a saturated fatty acid ester moiety with a carbon number of 8 and a saturated fatty acid ester moiety with a carbon number of 10, is more preferred.
  • C8 saturated fatty acid triglyceride composed of a saturated fatty acid having a carbon number of 8 and glycerin
  • C10 saturated fatty acid triglyceride composed of a saturated fatty acid having a carbon number of 10 and glycerin
  • C8 saturated fatty acid triglyceride C10 saturated fatty acid triglyceride is preferably from 60:40 to 90:10, more preferably from 70:30 to 80:20.
  • the kinematic viscosity at 40° C. thereof is preferably from 8 to 120 mm 2 /s. If the kinematic viscosity is less than 8 mm 2 /s (40° C.), heat resistance is highly likely to be poor, and if it exceeds 120 mm 2 /s (40° C.), shear resistance of the base oil itself is increased, which causes increase in a starting torque and rotary torque when the base oil is sealed in a rolling bearing.
  • the kinematic viscosity at 40° C. is preferably from 8 to 50 mm 2 /s, more preferably from 10 to 35 mm 2 /s, still more preferably from 10 to 20 mm 2 /s.
  • a food additive or a medicinal additive which is compliant with official compendiums such as Japanese Standards of Food Additives and Japanese Pharmacopoeia, is preferably used.
  • the amount of the thickener is preferably from 5 to 35 mass % of the total amount of the grease composition. If the amount of the thickener is less than 5 mass %, shear stability is deteriorated and when applied to a sliding/rolling device such as rolling bearing, the grease composition is softened due to shearing action in a sliding/rolling portion and leaks excessively. On the other hand, if the amount of the thickener exceeds 35 mass %, the proportion of the base oil used for lubrication may be too much reduced, causing imbalance.
  • the amount of the thickener is preferably from 10 to 28 mass %, more preferably from 12 to 25 mass %, still more preferably from 13 to 23 mass %.
  • a structure stabilizer is added so as to stabilize the calcium stearate structure.
  • the structure stabilizer is preferably a monoglyceride or a polyhydric alcohol, and a food additive or a medicinal additive, which is compliant with official compendiums such as Japanese Standards of Food Additives and Japanese Pharmacopoeia, is preferred.
  • the structure stabilizer includes palm hardened oil monoglyceride, oleic acid monoglyceride, glycerin, or the like.
  • the amount of the structure stabilizer added is not limited as long as it is an amount capable of stabilizing the calcium stearate structure, but the amount added is, relative to the calcium stearate, preferably from 5 to 6.5 mass % in the case of palm hardened oil monoglyceride and from 1 to 2 mass % in the case of glycerin.
  • the heat resistance of the grease composition is enhanced. Specifically, as demonstrated in Examples later, the unworked penetration after heating at 100° C. for 100 hours becomes 77 or more.
  • the worked penetration is preferably NLGI consistency No. 2 or 3.
  • additives for an ordinary grease can be added as long as the effects of the present invention are not lost.
  • the additive may be an antioxidant, a rust preventive, an extreme-pressure agent, a friction regulator, a pH regulator, or the like, but those having a low environmental impact and being highly safe to the human body are preferably selected.
  • the antioxidant vitamins, or the like are used.
  • the method for preparing the grease composition may include adding calcium stearate and a structure stabilizer to an edible oil as a base oil, stirring the mixture under heating, rapidly cooling the entirety to a semi-solid state after the calcium stearate is completely dissolved, adding, if desired, other additives, and then kneading the mixture by a kneader such as roll mill. If the cooling after dissolution of calcium stearate is slow cooling to room temperature by standing, the calcium stearate is coagulated, and a soft grease composition is formed, causing a problem of grease leakage.
  • the present invention also relates to a rolling bearing in which the grease composition is sealed.
  • the kind of the rolling bearing is not limited, and, for example, a deep-groove ball bearing, an angular contact ball bearing, a cylindrical roller bearing, a needle roller bearings, or a tapered roller bearing is filled with the grease composition and sealed by a seal member.
  • the grease composition was left standing still in a constant-temperature bath at 100° C. for 100 hours and then measured for the unworked penetration, and the change from the initial worked penetration was evaluated.
  • the test was performed by a Shell sliding four-ball tester.
  • a 1 ⁇ 2-inch steel ball was used for both the stationary test ball in the lower part and the rotated test ball in the upper part. Only the rotated ball was coated with 0.1 g of the grease composition, and the test was performed under the conditions of a vertical load of 49 N, a rotation speed of 1,000 min ⁇ 1 , a rotation time of 20 minutes, and a temperature from room temperature to as the temperature becomes.
  • An average value of wear mark diameters of three stationary balls in the lower part after the test was calculated, and the measurement result was shown by a relative value to the average wear mark diameter of Comparative Example 1.
  • FIG. 1 shows the results of (1) the stationary heating test
  • FIG. 2 shows the results of (2) the seizing durability test
  • FIG. 3 shows the results of (3) the wear resistance test.
  • the relationship between the unworked penetration after heating and the seizing durability life ratio, the relationship between the ratio of consistencies before and after heating and the wear resistance ratio, and the relationship between the (worked penetration/oil separation) and the wear resistance ratio are graphically shown in FIG. 4 , FIG. 5 , and FIG. 6 , respectively.
  • Example 1 Example 2
  • Example 3 Example 4
  • Stationary heating test 144 129 93 77 Seizing durability test 1.9 1.3 1.2 1.2
  • Example 1 triglyceride and calcium stearate are used as the base oil and the thickener, respectively, and palm hardened oil monoglyceride is further used as the structure stabilizer; in Example 2, the structure stabilizer of Example 1 is changed to glycerin; and in Examples 3 and 4, the amount of the thickener is changed in Example 2.
  • grease hardening after stationary heating is inhibited and when the grease is sealed in a bearing, an extended durability life and good wearing resistance are obtained.
  • lubricity not only in a bearing but also in a region requiring grease lubrication (for example, a gear) is excellent.
  • the unworked penetration after a heating test i.e., after standing at 100° C. for 100 hours
  • the unworked penetration is preferably 93 or more, more preferably 129 or more.
  • Comparative Example 1 the structure stabilizer is omitted from Example 1.
  • a structure stabilizer is not contained, grease hardening by heat is very significant.
  • the grease is hardened due to heat generated by friction and since the grease is not sufficiently supplied to the friction surface, the wear mark diameter in the wear resistance test becomes large.
  • Comparative Example 2 the amount of the thickener of Comparative Example 1 is decreased. Despite soft penetration in the initial stage, when a structure stabilizer is not mixed, grease hardening after heating is significant.
  • Comparative Example 3 is a general-purpose grease, and mineral oil and lithium 12-hydroxystearate are used as the base oil and the thickener, respectively. Compared with Examples, the seizing life is short and since mineral oil is used for the base oil, not only the lubricity is low but also the wear resistance is poor.
  • Comparative Example 4 is a grease having the same composition as in Example 1 but prepared by changing the cooling method. Although the amount of the thickener is also the same, due to change of the cooling method, the thickener is aggregated, and the grease is softened. Therefore, the grease leakage is significant in the seizing durability test, and the seizing life expires at an early stage. In addition, the grease is likely to scatter, and the wear mark diameter in the wear resistance test is large.
  • the present invention is useful as a rolling bearing used in a food machine.

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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)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Lubricants (AREA)
  • Rolling Contact Bearings (AREA)
US14/897,266 2013-06-12 2014-06-12 Grease composition and rolling bearing Abandoned US20160145522A1 (en)

Applications Claiming Priority (3)

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JP2013123620 2013-06-12
JP2013-123620 2013-06-12
PCT/JP2014/065546 WO2014200048A1 (ja) 2013-06-12 2014-06-12 グリース組成物及び転がり軸受

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US (1) US20160145522A1 (ja)
EP (1) EP3009496A4 (ja)
JP (1) JPWO2014200048A1 (ja)
CN (1) CN105392872A (ja)
WO (1) WO2014200048A1 (ja)

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JP6838924B2 (ja) * 2016-10-13 2021-03-03 デュポン・東レ・スペシャルティ・マテリアル株式会社 グリース組成物およびその製造方法
CN107338089A (zh) * 2017-05-27 2017-11-10 杨朴 一种耐压叶轮给料机密封油

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB701637A (en) * 1949-09-16 1953-12-30 Bataafsche Petroleum Improvements in and relating to lubricating greases
WO2003018729A1 (en) * 2001-08-31 2003-03-06 Abcon Aps Non-toxic biodegradable grease
US20080085070A1 (en) * 2004-06-07 2008-04-10 Masakazu Hirata Retainer for Rolling Bearing, and Rolling Bearing
JP2009091502A (ja) * 2007-10-11 2009-04-30 Chuo Yuka Kk 食品機械用グリース
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