CN114921279A - Grease composition - Google Patents
Grease composition Download PDFInfo
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- CN114921279A CN114921279A CN202210117675.9A CN202210117675A CN114921279A CN 114921279 A CN114921279 A CN 114921279A CN 202210117675 A CN202210117675 A CN 202210117675A CN 114921279 A CN114921279 A CN 114921279A
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- thickener
- grease composition
- calcium carbonate
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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
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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
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
- C10M2201/0626—Oxides; Hydroxides; Carbonates or bicarbonates used as thickening agents
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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
- C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2213/06—Perfluoro polymers
- C10M2213/0606—Perfluoro polymers 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
- C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2213/06—Perfluoro polymers
- C10M2213/062—Polytetrafluoroethylene [PTFE]
- C10M2213/0626—Polytetrafluoroethylene [PTFE] used as thickening agents
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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
- C10M2215/22—Heterocyclic nitrogen compounds
- C10M2215/221—Six-membered rings containing nitrogen and carbon only
- C10M2215/222—Triazines
-
- 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
- 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
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
-
- 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
- C10N2040/38—Conveyors or chain belts
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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 composition which has high static friction force in the sliding of metal members and excellent abrasion resistance. The grease composition contains a base oil containing at least 1 perfluoropolyether and a thickener containing 5 mass% or more and 100 mass% or less of calcium carbonate, 0 mass% or more and 95 mass% or less of melamine cyanurate, and 0 mass% or more and 20 mass% or less of polytetrafluoroethylene, relative to the total mass of the thickener.
Description
Technical Field
The present invention relates to a grease composition.
Background
In transmission members such as gears and clutches, and feed screws such as sliding screws and ball screws, a stationary function for preventing positional change at the time of stationary is required, and grease having a high static friction force is required. Since this stationary function utilizes sliding contact, friction and abrasion are generated in the sliding member. Therefore, in order to achieve a longer life of the machine part, excellent wear resistance is also required as the grease.
For example, patent document 1 discloses the following: by using melamine cyanurate and polytetrafluoroethylene in the solid lubricant, a grease composition having an excellent static function (high friction) can be obtained. Patent document 2 discloses the following: by using calcium carbonate in the solid lubricant, a grease composition having an excellent rest function (high friction) can be obtained. Patent document 3 discloses a grease composition containing perfluoropolyether oil as a base oil and melamine cyanurate as a thickener.
However, in all patent documents, although the lubrication characteristics based on the sliding between the resin members or the sliding between the resin member and the metal member are evaluated, the lubrication characteristics based on the sliding between the metal members are not mentioned. Therefore, development of a grease composition that exhibits sufficient lubricating performance even in sliding applications of metal members is desired.
Documents of the prior art
Patent literature
Patent document 1: japanese laid-open patent publication No. 2009-13351
Patent document 2: international publication No. 2018/030090
Patent document 3: japanese patent laid-open publication No. 2017-20052
Disclosure of Invention
Problems to be solved by the invention
The invention provides a grease composition which has high static friction force in the sliding of metal members and excellent abrasion resistance.
Means for solving the problems
The grease composition according to an embodiment of the present invention contains a base oil containing at least 1 perfluoropolyether and a thickener containing 5 mass% to 100 mass% of calcium carbonate, 0 mass% to 95 mass% of melamine cyanurate, and 0 mass% to 20 mass% of polytetrafluoroethylene, relative to the total mass of the thickener.
In one embodiment of the present invention, the calcium carbonate has an average particle size of 30 μm or less.
In one embodiment of the present invention, the thickener contains calcium carbonate in an amount of more than 10 mass% and 100 mass% or less with respect to the total mass of the thickener.
In one embodiment of the present invention, the content of polytetrafluoroethylene is 0 mass% with respect to the total mass of the thickener.
In one embodiment of the present invention, the calcium carbonate has an average particle diameter of 10 μm or less, and the content of the calcium carbonate is 100 mass% or the content of the melamine cyanurate having an average particle diameter of 10 μm or less is more than 0 mass% and less than 90 mass% with respect to the total mass of the thickener.
In one embodiment of the present invention, the grease composition is used for sliding portions of metal members with each other.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, a grease composition having high static friction force and excellent wear resistance in sliding of metal members with each other can be provided.
Detailed Description
Hereinafter, embodiments of the present invention will be described. The grease composition according to the present embodiment contains a base oil as a main component and a thickener, and contains at least 1 perfluoropolyether as the base oil and 5 to 100 mass% of calcium carbonate as the thickener. The thickener may further contain melamine cyanurate in an amount of 0 to 95% by mass, and polytetrafluoroethylene in an amount of 0 to 20% by mass. A grease composition containing perfluoropolyether as a base oil is blended with a thickener containing calcium carbonate alone or a thickener containing calcium carbonate, melamine cyanurate in a predetermined amount and polytetrafluoroethylene in a predetermined amount, thereby imparting a high static function against sliding between metal members and excellent friction characteristics to the grease composition. This makes it possible to obtain a grease composition having high static friction and excellent wear resistance in sliding of metal members with each other. Hereinafter, each component contained in the grease composition according to the present embodiment will be described in detail.
< base oil >
In this embodiment, the base oil comprises at least 1 perfluoropolyether (PFPE). The perfluoropolyether may be linear or branched, and is not particularly limited, and for example, a compound represented by the following formula (1) can be suitably used.
[ chemical formula 1 ]
RfO(CF 2 O) x (C 2 F 4 O) y (C 3 F 6 O) z Rf ···(1)
In formula (1), CF 2 O radical, C 2 F 4 O radical and C 3 F 6 The O group is a group randomly bonded to the main chain, and Rf is a C1-5, preferably 1-3 perfluoro lower alkyl group such as perfluoromethyl group, perfluoroethyl group, perfluoropropyl group, etc. In addition, x + y + z is 3 to 200, and at least one of x, y and z may be 0. As the compound represented by the formula (1), for example, perfluoropolyethers represented by the following formulae (2) to (5) can be used.
[ chemical formula 2 ]
RfO[CF(CF 3 )CF 2 O] a Rf ···(2)
In formula (2), Rf is the same as the group defined in formula (1), and a is 2 to 200. The compound represented by the formula (1) can be produced by completely fluorinating a precursor produced by photooxidative polymerization of hexafluoropropylene, or can be produced by anion polymerization of hexafluoropropylene under a cesium fluoride catalyst and further subjecting the resultant product to CF having a terminal (CF) 3 ) The COF group acyl fluoride compound is generated by treating with fluorine gas.
[ chemical formula 3 ]
RfO[CF(CF 3 )CF 2 O] b (CF 2 O) e Rf ···(3)
In formula (3), Rf is the same as the group defined in formula (1), b + c is 3 to 200, and b: c is 10: 90 to 90: 10. The compound represented by the formula (3) can be produced by completely fluorinating a precursor produced by photooxidative polymerization of hexafluoropropylene.
[ chemical formula 4 ]
RfO(CF 2 CF 2 O) d (CF 2 O) e Rf ···(4)
In the formula (4), Rf is the same as the group defined in the formula (1), d + e is 3 to 200, d: e is 10: 90 to 90: 10, and d/e > 1 is preferred. The compound represented by the formula (4) can be produced by completely fluorinating a precursor produced by photooxidative polymerization of tetrafluoroethylene.
[ chemical formula 5 ]
F(CF 2 CF 2 CF 2 O) f CF 2 CF 3 ···(5)
In formula (5), f is 2 to 100. The compound represented by the formula (5) can be prepared by subjecting 2, 2, 3, 3-tetrafluorooxetane to anionic polymerization in the presence of cesium fluoride catalyst and subjecting the resulting fluoropolyether (CH) 2 CF 2 CF 2 O) n The fluorine gas is treated under ultraviolet irradiation at 160 to 300 ℃ to generate the fluorine gas.
The perfluoropolyether as the base oil may be used alone or in combination of 2 or more. The kinematic viscosity (40 ℃) of the perfluoropolyether is not particularly limited, but is preferably 10 to 2000mm 2 Second, more preferably 10 to 1500mm 2 In seconds. As a commercially available product of perfluoropolyether, "FOMBLIM (registered trademark) M03" (kinematic viscosity at 40 ℃ C.: 17 mm) manufactured by SOLVAY SPECIATE POLYMERS JAPAN company, for example, can be used 2 Second), "FOMBLIM (registered trademark) M15" (kinematic viscosity at 40 ℃: 85mm 2 S), "BARRIERTA J60 FLUID", manufactured by NOK Kluybo company (kinematic viscosity at 40 ℃: 60mm 2 In seconds), etc.
The content of the base oil contained in the grease composition is preferably 50% by mass or more and 95% by mass or less, more preferably 60% by mass or more and 90% by mass or less, and still more preferably 70% by mass or more and 85% by mass or less, with respect to the total mass of the grease composition.
< thickening agent >
In the present embodiment, the thickener contains 5 mass% or more and 100 mass% or less, preferably more than 10 mass% and 100 mass% or less, calcium carbonate, 0 mass% or more and 95 mass% or less, melamine cyanurate, and 0 mass% or more and 20 mass% or less of polytetrafluoroethylene, relative to the total mass of the thickener. Specifically, the thickener is preferably calcium carbonate, a mixture of calcium carbonate and melamine cyanurate, or a mixture of calcium carbonate and polytetrafluoroethylene. In particular, the static friction force and the abrasion resistance can be further improved by including calcium carbonate in an amount of more than 10 mass% and 100 mass% or less based on the total mass of the thickener. Further, the content of calcium carbonate can be set to 100% by mass based on the total mass of the thickener, whereby a grease composition having remarkably excellent static friction force and wear resistance can be obtained.
The content of calcium carbonate contained in the grease composition is preferably 2% by mass or more and 50% by mass or less, more preferably 5% by mass or more and 40% by mass or less, and still more preferably 10% by mass or more and 30% by mass or less, with respect to the total mass of the grease composition. The average particle size (primary particle size) of calcium carbonate is preferably 0.05 μm or more and 30 μm or less, more preferably 0.06 μm or more and 20 μm or less, and still more preferably 0.08 μm or more and 10 μm or less. In particular, the static friction can be improved by using calcium carbonate having an average particle diameter of 10 μm or less.
As commercially available products of calcium carbonate, "white Brilliant PZ" (primary particle diameter: 0.08 μm) manufactured by Baishika calcium Co., Ltd, "ESCALON # 3500" (average particle diameter: 1.0 μm) manufactured by Sancosmopowder, and "ESCALON grade one" (average particle diameter: 20 μm) manufactured by Sancosmopowder, and "SFT-2000" (average particle diameter: 30 μm) manufactured by Sancosmopowder were used, for example.
In the case where the thickener further contains melamine cyanurate, the content of melamine cyanurate is preferably more than 0 mass% and 95 mass% or less, more preferably more than 0 mass% and less than 90 mass%, and more preferably more than 0 mass% and 80 mass% or less, with respect to the total mass of the thickener. The static friction force and the abrasion resistance can be further improved by setting the content of the melamine cyanurate to less than 90 mass% based on the total mass of the thickener.
The average particle size of the melamine cyanurate is preferably 0.1 to 30 μm, more preferably 0.5 to 20 μm, and still more preferably 1.0 to 10 μm. In particular, by using melamine cyanurate having an average particle diameter of 10 μm or less, the static friction can be improved.
The melamine cyanurate to be used is not particularly limited, and known melamine cyanurate can be used. Specifically, the melamine cyanurate described in Japanese patent application laid-open Nos. 45-5595, 61-34430, 05-310716, and 07-224049 can be suitably used. Examples of commercially available products include "MCA-1" manufactured by Mitsubishi chemical corporation, "MC-860", "MC-4000", "MC-4500", "MC-6000" manufactured by Nissan chemical corporation, and "Melapur (registered trademark) MC 15" manufactured by BASF corporation.
In the case where the thickener further contains Polytetrafluoroethylene (PTFE), the content of polytetrafluoroethylene is preferably more than 0 mass% and 10 mass% or less, more preferably more than 0 mass% and 5 mass% or less, with respect to the total mass of the thickener. By setting the content of polytetrafluoroethylene to 10% by mass or less based on the total mass of the thickener, a high static friction force and excellent wear resistance can be imparted to the grease composition. On the other hand, in the grease composition containing perfluoropolyether as a base oil and calcium carbonate as a thickener, the static friction force and the wear resistance can be further improved by making the content of polytetrafluoroethylene 0 mass% with respect to the total mass of the thickener, that is, preferably not containing polytetrafluoroethylene which has been conventionally used.
The average particle diameter of the polytetrafluoroethylene is preferably 0.1 μm or more and 50.0 μm or less, and more preferably 0.1 μm or more and 10.0 μm or less. The polytetrafluoroethylene used is not particularly limited, and commercially available products such as "Dyneon (registered trademark) TF 9207Z" manufactured by 3M JAPAN, and "Algoflon (registered trademark) DF PTFE" manufactured by SOLVAY SPECIALTY POLYMERS JAPAN can be used.
The content of the thickener contained in the grease composition is preferably 5% by weight or more and 50% by weight or less, more preferably 10% by weight or more and 40% by weight or less, and further preferably 15% by weight or more and 30% by weight or less, based on the total weight of the grease composition.
In the present embodiment, the grease composition may contain other additives within a range that does not affect the effect thereof. The additives include, for example, known antioxidants, extreme pressure agents, rust inhibitors, corrosion inhibitors, viscosity index improvers, and oiliness agents. These additives can be used alone, also can be used in combination of 2 or more, according to the purpose of use to determine the type, mixing amount and other arbitrary.
Examples of the antioxidant include: phenol antioxidants such as 2, 6-di-t-butyl-4-methylphenol and 4, 4' -methylenebis (2, 6-di-t-butylphenol); and amine antioxidants such as alkyldiphenylamine, phenothiazine, alkylated phenyl- α -naphthylamine, phenothiazine, and alkylated phenothiazine.
As the extreme pressure agent, for example: phosphorus compounds such as acid phosphates, phosphites, and acid phosphate amine salts; sulfur compounds such as sulfides and dithioethers; chlorine-based compounds such as chlorinated paraffin and chlorinated biphenyl; and metal organic compounds such as zinc dialkyldithiophosphate (ZnDTP) and molybdenum dialkyldithiocarbamate (MoDTP).
Examples of the rust inhibitor include fatty acids, fatty acid soaps, alkylsulfonates, fatty acid amines, oxidized paraffins, polyoxyethylene alkyl ethers, and the like.
Examples of the anticorrosive agent include benzotriazole, benzimidazole, and thiadiazole.
Examples of the viscosity index improver include polymethacrylate, ethylene-propylene copolymer, polyisobutylene, polyalkylstyrene, and hydrogenated styrene-isoprene copolymer.
Examples of the oily agent include fatty acids, higher alcohols, polyhydric alcohol esters, fatty amines, and fatty acid monoglycerides.
The grease composition according to the present embodiment can be produced by mixing the base oil, the thickener, and any other component described above using a common mixing means. The mixing means is not particularly limited, and for example, a three-roll mill, a high-pressure homogenizer, or the like can be suitably used.
The grease composition according to the present embodiment has high static friction and low wear depth during sliding between metal members, and is therefore suitable for use in sliding portions between metal members. Therefore, such a grease composition exhibits excellent lubricating performance in sliding between metal members.
The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and includes all the embodiments included in the concept of the present invention and the claims, and various changes can be made within the scope of the present invention.
Examples
Examples of the present invention will be described below, but the present invention is not limited to these examples as long as the invention does not depart from the gist thereof. Unless otherwise specified, the room temperature is in the range of 20 ℃. + -. 5 ℃.
(example 1)
In the presence of perfluoropolyether A (kinematic viscosity at 40 ℃ C.: 17 mm) 2 (s) 40 parts by mass of a product name "FOMBLIM (registered trademark) M03", manufactured by SOLVAY SPECIATE POLYMERS JAPAN company) and perfluoropolyether B (kinematic viscosity at 40 ℃: 85mm 2 40 parts by mass of a base oil having a product name of "formbulim (registered trademark) M15", manufactured by SOLVAY SPECIALTY POLYMERS JAPAN, and calcium carbonate a (average particle size: 1.0 μm, product name "ESCALON # 3500", manufactured by sanko corporation) was stirred, and then treated with a three-roll mill to prepare a grease composition.
< measurement and evaluation of abrasion resistance >
The grease composition (sample oil) thus obtained was applied to a test piece using an SRV tester, and a sliding test was performed under the following test conditions to measure the metal-to-metal wear depth. The evaluation was good if the wear depth after the test was less than 2.0 μm, good if the wear depth was 2.0 μm or more and 3.0 μm or less, and good if the wear depth was more than 3.0 μm or not more and 3.0 μm or less, good if the wear depth was more than 3.0 μm or not more and the test was stopped automatically before the end of the test and could not be measured, and good wear resistance was evaluated if the wear depth was more than "Δ". The evaluation results are shown in table 1.
Upper test piece: SUJ2 Metal ball (diameter 10mm)
Lower test piece: metallic disk made of SUJ2
Loading: 100N
Coating amount of sample oil: 0.07g
Frequency: 100Hz
Amplitude: 0.5mm
Temperature: at room temperature
Time: 1 hour (h)
< measurement and evaluation of static Friction force >
The grease composition (sample oil) thus obtained was applied to a test piece using a reciprocating motion tester, and a sliding test was performed under the following test conditions to measure the static friction between metals. The evaluation was good if the static friction force at the 5 th time from the start of the test exceeded 500g, good if the static friction force was 400g or more and 500g or less, good, and "Δ" if the static friction force was less than 400g, good, "x" if it was "Δ" or more, and high static friction force. The evaluation results are shown in table 1.
Upper test piece: S45C Metal ball (diameter 10mm)
Lower test piece: S45C Metal plate
Loading: 3.5kg
Coating amount of sample oil: 0.15g
Speed: 0.5 mm/sec
Temperature: at room temperature
Stroke: 10mm
< comprehensive evaluation >
The evaluation was "excellent" if both the evaluation of the wear resistance and the evaluation of the static friction were "good", the evaluation was "good" if either one of the evaluation of the wear resistance and the evaluation of the static friction was "good" and the other one was "Δ", the evaluation was "good", the evaluation was "Δ" if both the evaluation of the wear resistance and the evaluation of the static friction were "Δ", and the evaluation was "x" if either one of the evaluation of the wear resistance and the evaluation of the static friction was "x".
(example 2)
A grease composition was prepared in the same manner as in example 1, except that the loading of calcium carbonate A was changed to 10 parts by mass, and 10 parts by mass of melamine cyanurate A (average particle diameter: 2.0 μm, product name "MC-6000", manufactured by Nissan chemical Co., Ltd.) was added as a thickener. The evaluation results are shown in table 1.
(example 3)
A grease composition was produced in the same manner as in example 1, except that the loading of calcium carbonate a was changed to 5 parts by mass, and 15 parts by mass of melamine cyanurate a was further added as a thickener. The evaluation results are shown in table 1.
(example 4)
A grease composition was produced in the same manner as in example 1, except that the loading of calcium carbonate a was changed to 2 parts by mass, and 18 parts by mass of melamine cyanurate a was further added as a thickener. The evaluation results are shown in table 1.
(example 5)
A grease composition was prepared in the same manner as in example 2, except that calcium carbonate B (primary particle diameter: 0.08 μm, product name "Baiyanhua PZ", manufactured by Baishi calcium Co., Ltd.) was used instead of calcium carbonate A. The evaluation results are shown in table 1.
(example 6)
A grease composition was prepared in the same manner as in example 2, except that calcium carbonate C (average particle diameter: 20 μm, product name "ESCALON grade", manufactured by Sanko Co., Ltd.) was used instead of calcium carbonate A. The evaluation results are shown in table 1.
(example 7)
A grease composition was prepared in the same manner as in example 2, except that melamine cyanurate B (average particle diameter: less than 14 μm, product name "MC-4000", manufactured by Nissan chemical Co., Ltd.) was used instead of melamine cyanurate A. The evaluation results are shown in table 1.
(example 8)
A grease composition was prepared in the same manner as in example 5, except that calcium carbonate D (average particle diameter: 30 μm, product name SFT-2000 ", manufactured by Sanko Junyaku Co., Ltd.) was used instead of calcium carbonate B. The evaluation results are shown in table 1.
(example 9)
A grease composition was prepared in the same manner as in example 1 except that the loading of calcium carbonate A was changed to 18 parts by mass, and 2 parts by mass of polytetrafluoroethylene (average particle diameter: 4.0 μ M, product name "Dyneon (registered trademark) TF 9207Z", manufactured by 3M JAPAN Co., Ltd.) was further added as a thickener. The evaluation results are shown in table 1.
Comparative example 1
A grease composition was produced in the same manner as in example 1, except that the loading of perfluoropolyether a was changed to 42 parts by mass, the loading of perfluoropolyether B was changed to 43 parts by mass, and 15 parts by mass of melamine cyanurate a was added as a thickener in place of calcium carbonate a. The evaluation results are shown in table 2.
Comparative example 2
A grease composition was produced in the same manner as in example 1, except that the loading of calcium carbonate a was changed to 15 parts by mass, and 5 parts by mass of polytetrafluoroethylene was further added as a thickener. The evaluation results are shown in table 2.
Comparative example 3
A grease composition was produced in the same manner as in example 2, except that polytetrafluoroethylene was used instead of the melamine cyanurate a. The evaluation results are shown in table 2. In addition, since the static friction evaluation was determined as "x", the abrasion resistance was not measured and evaluated.
Comparative example 4
A grease composition was produced in the same manner as in example 3, except that polytetrafluoroethylene was used instead of the melamine cyanurate a. The evaluation results are shown in table 2. Note that, since the static friction force was determined to be "x" in the evaluation of the wear resistance, the measurement and the evaluation were not performed.
Comparative example 5
A grease composition was produced in the same manner as in example 1, except that the loading of perfluoropolyether a was changed to 39.5 parts by mass, the loading of perfluoropolyether B was changed to 41 parts by mass, and 19.5 parts by mass of polytetrafluoroethylene was added as a thickener in place of calcium carbonate a. The evaluation results are shown in table 2.
Comparative example 6
A grease composition was produced in the same manner as in example 1, except that 10 parts by mass of melamine cyanurate a and 10 parts by mass of polytetrafluoroethylene were added as the thickener in place of calcium carbonate a. The evaluation results are shown in table 2.
Comparative example 7
A mixing and stirring tank was charged with a mixture containing 58 parts by mass of a poly-alpha-olefin (kinematic viscosity at 40 ℃ C.: 30 mm) 2 (ii)/s, a base oil having a product name of "DURASYN (registered trademark) 166", manufactured by INEOS Oligomers Japan) and sebacic acid and carboxylic acid monostearylamide (sebacic acid and carboxylic acid monostearylamide are blended in such an amount that the barium complex soap as a thickener can be blended as shown in Table 2), followed by heating and stirring at 80 to 130 ℃ and then adding barium hydroxide to carry out a saponification reaction, thereby forming a barium complex soap. After the saponification reaction, 20 parts by mass of calcium carbonate a as a thickener was further added to the gel-like material formed by cooling, and after stirring, the mixture was treated with a three-roll mill to prepare a grease composition. The evaluation results are shown in table 2. In addition, since the static friction evaluation was determined as "x", the abrasion resistance was not measured and evaluated.
[ TABLE 1 ]
Content of calcium carbonate relative to the total amount of thickener
[ TABLE 2 ]
Content of calcium carbonate relative to the total amount of thickener
The components shown in tables 1 and 2 are shown below. The values of the components in tables 1 and 2 represent "parts by mass".
< base oil >
Perfluoropolyether A: the product is FOMBLIM (registered trademark) M03 (manufactured by SOLVAY SPECIATY POLYMERS JAPAN, kinematic viscosity at 40 deg.C: 17mm 2 /s)
Perfluoropolyether B: the product name "FOMBLIM (registered trademark) M15" (manufactured by SOLVAY SPECIATY POLYMERS JAPAN, 40 ℃ kinematic viscosity: 85 mm) 2 /s)
Polyalphaolefins: the product name "DURASYN (registered trademark) 166" (manufactured by INEOS Oligomers Japan, 40 ℃ kinematic viscosity: 30 mm) 2 /s)
< thickening agent >
Calcium carbonate a: the product name "ESCALON # 3500" (manufactured by Sanko Co., Ltd., average particle diameter: 1.0 μm)
Calcium carbonate B: the product name is "Bai Yan Hua PZ" (made by Bai Shi Ca Co., Ltd., primary particle diameter: 0.08 μm)
Calcium carbonate C: the product name "ESCALON class one" (manufactured by Sanko flour Co., Ltd., average particle diameter: 20 μm)
Calcium carbonate D: the product name is "SFT-2000" (average particle size: 30 μm, manufactured by Sanko Co., Ltd.)
Melamine cyanurate a: the product name "MC-6000" (average particle diameter: 2.0 μm, manufactured by Nissan chemical Co., Ltd.)
Melamine cyanurate B: the product name is "MC-4000" (average particle size: less than 14 μm, manufactured by Nissan chemical Co., Ltd.)
Polytetrafluoroethylene: the product name "Dyneon (registered trade Mark) TF 9207Z" (3M JAPAN, average particle size: 4.0 μ M)
Barium composite soap
As is clear from table 1, in examples 1 to 9, the grease compositions contained: a base oil comprising a perfluoropolyether; and a thickener containing only calcium carbonate, or a thickener containing melamine cyanurate in a predetermined amount and polytetrafluoroethylene in addition to calcium carbonate. Therefore, the grease composition obtained has high static friction force in sliding of metal members with each other and is excellent in wear resistance. In particular, in examples 1 to 3 and 5 to 9 containing calcium carbonate in an amount of more than 10 mass% and 100 mass% or less with respect to the total mass of the thickener, the evaluation was "good" in a comprehensive evaluation, and high lubricating performance was exhibited. Further, in example 1 in which calcium carbonate having an average particle size of 10 μm or less was used and the content of calcium carbonate was 100 mass% with respect to the total mass of the thickener, and in examples 2, 3, and 5 in which calcium carbonate having an average particle size of 10 μm or less was used in the same manner and the content of melamine cyanurate having an average particle size of 10 μm or less was more than 0 mass% and less than 90 mass% with respect to the total mass of the thickener, the overall evaluation was "excellent" and higher lubricating performance was exhibited.
On the other hand, in comparative example 1 in which calcium carbonate was not used but melamine cyanurate was used as a thickener instead, the wear depth was high and the wear resistance was poor. In addition, in comparative examples 2 to 3 in which calcium carbonate and polytetrafluoroethylene were used as thickeners but the content of polytetrafluoroethylene was more than 20 mass% based on the total mass of the thickeners, high static friction force could not be obtained, and in comparative example 4 in which the content of polytetrafluoroethylene was 75 mass% based on the total mass of the thickeners, the depth of wear could not be measured, and the wear resistance was poor.
In comparative example 5 in which calcium carbonate was not used but polytetrafluoroethylene was used as a thickener instead, the abrasion depth was high and the abrasion resistance was poor. In comparative example 6, in which calcium carbonate was not used but melamine cyanurate and polytetrafluoroethylene were used as the thickener instead, the depth of wear could not be measured, and the wear resistance was poor.
In comparative example 7 in which a synthetic hydrocarbon oil was used as a base oil instead of perfluoropolyether and not only calcium carbonate but also a barium complex soap was used as a thickener, a high static friction force could not be obtained.
Industrial applicability
The grease composition according to the present invention has high static friction force in sliding between metal members and excellent wear resistance, and therefore can be effectively applied to portions where metal portions come into contact with each other, such as gears, belts, chains, and other power transmission devices, rolling bearings, and sliding bearings.
Claims (6)
1. A grease composition characterized by comprising, in a grease,
the grease composition contains a base oil and a thickener,
the base oil comprises at least 1 perfluoropolyether,
the thickener contains 5-100 mass% calcium carbonate, 0-95 mass% melamine cyanurate, and 0-20 mass% polytetrafluoroethylene relative to the total mass of the thickener.
2. The grease composition according to claim 1, wherein the calcium carbonate has an average particle diameter of 30 μm or less.
3. Grease composition according to claim 1 or 2, wherein the thickener comprises more than 10 mass% and 100 mass% or less of calcium carbonate relative to the total mass of the thickener.
4. A grease composition according to any one of claims 1 to 3, wherein the content of polytetrafluoroethylene is 0 mass% with respect to the total mass of the thickener.
5. The grease composition according to any one of claims 1 to 4, wherein the calcium carbonate has an average particle diameter of 10 μm or less,
and the content of calcium carbonate is 100 mass% or the content of melamine cyanurate having an average particle diameter of 10 μm or less is more than 0 mass% and less than 90 mass% with respect to the total mass of the thickener.
6. A grease composition according to any one of claims 1 to 5, which is used for sliding portions of metal members with each other.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021021009A JP2022123601A (en) | 2021-02-12 | 2021-02-12 | lubricating grease composition |
| JP2021-021009 | 2021-02-12 |
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| CN114921279A true CN114921279A (en) | 2022-08-19 |
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| CN202210117675.9A Pending CN114921279A (en) | 2021-02-12 | 2022-02-08 | Grease composition |
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Citations (7)
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| JP2004269789A (en) * | 2003-03-11 | 2004-09-30 | Nsk Ltd | Grease formulation and turning device |
| JP2008297375A (en) * | 2007-05-29 | 2008-12-11 | Ntn Corp | Lubricating system |
| JP2009013351A (en) * | 2007-07-06 | 2009-01-22 | Nok Kluber Kk | Grease composition |
| JP2009191173A (en) * | 2008-02-14 | 2009-08-27 | Nsk Ltd | Grease composition and rolling device |
| CN108715768A (en) * | 2018-06-27 | 2018-10-30 | 中国石油化工股份有限公司 | A kind of long-life high temperature bearing Perfluoropolyether lubricating grease and its preparation method and application |
| CN109097163A (en) * | 2018-06-29 | 2018-12-28 | 中国石油化工股份有限公司 | A kind of long-life round-the-clock Perfluoropolyether lubricating grease and its preparation method and application |
| CN109563429A (en) * | 2016-08-08 | 2019-04-02 | Nok克鲁勃株式会社 | Grease composition |
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2021
- 2021-02-12 JP JP2021021009A patent/JP2022123601A/en active Pending
-
2022
- 2022-02-08 CN CN202210117675.9A patent/CN114921279A/en active Pending
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|---|---|---|---|---|
| JP2004269789A (en) * | 2003-03-11 | 2004-09-30 | Nsk Ltd | Grease formulation and turning device |
| JP2008297375A (en) * | 2007-05-29 | 2008-12-11 | Ntn Corp | Lubricating system |
| JP2009013351A (en) * | 2007-07-06 | 2009-01-22 | Nok Kluber Kk | Grease composition |
| JP2009191173A (en) * | 2008-02-14 | 2009-08-27 | Nsk Ltd | Grease composition and rolling device |
| CN109563429A (en) * | 2016-08-08 | 2019-04-02 | Nok克鲁勃株式会社 | Grease composition |
| CN108715768A (en) * | 2018-06-27 | 2018-10-30 | 中国石油化工股份有限公司 | A kind of long-life high temperature bearing Perfluoropolyether lubricating grease and its preparation method and application |
| CN109097163A (en) * | 2018-06-29 | 2018-12-28 | 中国石油化工股份有限公司 | A kind of long-life round-the-clock Perfluoropolyether lubricating grease and its preparation method and application |
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| 胡雄风等: "碳酸钙粉体设备开式齿轮跑合润滑脂研制应用", 《当代化工》 * |
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| JP2022123601A (en) | 2022-08-24 |
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