A bearing grease composition and a method for producing the same

Abstract

The application discloses a bearing grease composition and a preparation method thereof, and relates to the technical field of chemical greases. In one aspect, the bearing grease composition comprises the following raw material components in mass fraction: 37-87.9 wt% of fluorine-containing base oil, 10-40 wt% of thickening agent, 2-18 wt% of anti-condensation agent and 0.1-5 wt% of additive. The anti-condensation agent comprises calcium phosphate. The additive comprises friction-reducing agent and corrosion and rust preventing agent, and the friction-reducing agent comprises at least one of molybdenum disulfide, fluorinated carbon and fluorinated graphene. In another aspect, the application further discloses a preparation method of the bearing grease composition. The bearing grease composition provided by the application has excellent colloidal stability and high-temperature performance, is stable in structure at high temperature, has small evaporation loss, has a long service life, has good lubricating and noise-reducing properties for high-temperature bearings, and can meet the lubricating requirements of equipment under the working condition of long-term high temperature.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of chemical lubricating grease, in particular to a bearing lubricating grease composition and a preparation method thereof. BACKGROUND

[0002] Lubricating grease is commonly used in mechanical equipment transmission devices such as gears or bearings that need to be lubricated, noise reduced and friction reduced. Bearing lubricating grease is a lubricant specially used for lubricating bearings, has the characteristics of rust prevention, oxidation resistance and wear resistance, and can prolong the service life of bearings and improve the working efficiency of bearings. For bearing lubricating grease, ordinary lithium-based lubricating grease and calcium-based lubricating grease are generally suitable for working conditions below 120 DEG C. For working conditions of 200 DEG C or even higher temperatures, the appropriate type of lubricating grease needs to be selected according to the specific situation. Common high-temperature-resistant lubricating grease is perfluoropolyether lubricating grease. However, perfluoropolyether lubricating grease can generally only be used in working conditions below 250 DEG C. At higher temperatures, fluorine-containing lubricating grease prepared by using polytetrafluoroethylene thickening perfluoropolyether oil is needed, but the above fluorine-containing lubricating grease is prone to polymerization and condensation, thereby affecting the lubricating effect and causing lubrication failure of the bearings of the equipment. For a series of equipment such as drying equipment, steel equipment, kiln car industry equipment and glass industry equipment that are operated for a long time under working conditions of 300 DEG C and above, a lubricating grease capable of withstanding higher temperature working conditions is needed to adapt to the situation. At the same time, the service life requirement of the lubricating grease for the above-mentioned equipment is also becoming more and more demanding.

[0003] Therefore, there is an urgent need for a high-temperature-resistant and long-life lubricating grease to solve the problems in the prior art. SUMMARY

[0004] In order to solve the above at least one technical problem, a high-temperature-resistant and long-life lubricating grease is developed, and the application provides a bearing lubricating grease composition and a preparation method thereof.

[0005] In one aspect, the application provides a bearing lubricating grease composition, which comprises the following mass fraction of raw material components: 37-87.9wt% of fluorine-containing base oil, 10-40wt% of thickening agent, 2-18wt% of anti-condensation agent and 0.1-5wt% of additive.

[0006] The anti-condensation agent comprises calcium phosphate.

[0007] The additive comprises a friction-reducing agent and an anti-corrosion and anti-rust agent, and the friction-reducing agent comprises at least one of molybdenum disulfide, fluorinated carbon and fluorinated graphene.

[0008] By adopting the technical scheme, the bearing grease composition provided in the application has excellent colloidal stability and high-temperature performance, is stable in structure at high temperature, has small evaporation loss, has a long service life, has good lubricating and noise-reducing performance for high-temperature bearings, and can meet the lubricating requirements of equipment under the working condition of being at a high temperature for a long time. Meanwhile, the anti-coagulation agent composed of the specific substances added in the bearing grease composition provided in the application can effectively solve the problem that fluorine-containing grease is prone to coagulation under high-temperature conditions, and improve the high-temperature anti-coagulation performance of the bearing grease composition provided in the application. In addition, the additives including friction-reducing agents and corrosion and rust preventing agents are added in the bearing grease composition provided in the application, so that the bearing grease composition obtained finally has good corrosion resistance in addition to high-temperature performance and anti-wear and friction-reducing performance, and cannot cause corrosion of metal parts under high-temperature conditions.

[0009] Optionally, the fluorine-containing base oil is perfluoropolyether oil, and the perfluoropolyether oil is selected from at least one of perfluoropolyether oils with a kinematic viscosity of 200-1500 mm 2 / s at 40 DEG C.

[0010] By adopting the technical scheme, the fluorine-containing base oil used in the bearing grease composition provided in the application is limited in type, and the kinematic viscosity of the fluorine-containing base oil is further limited. The fluorine-containing base oil has excellent high-temperature performance, and can meet the requirements of the bearing grease composition provided in the application for use in a high-temperature environment.

[0011] Further optionally, the perfluoropolyether oil is selected from perfluoropolyether oil with a kinematic viscosity of 680 mm 2 / s at 40 DEG C. and perfluoropolyether oil with a kinematic viscosity of 1000-1500 mm 2 / s at 40 DEG C. in a mass ratio of 0.8-2.2:1.

[0012] By adopting the technical scheme, the perfluoropolyether oil is further preferably a mixture of perfluoropolyether oils with different kinematic viscosities, and the performance of the bearing grease composition provided in the application can be further improved.

[0013] Optionally, the anti-coagulation agent further includes at least one of boron nitride and titanium dioxide.

[0014] By adopting the technical scheme, the performance of the bearing grease composition provided in the application can be further improved.

[0015] Further optionally, the anti-coagulation agent is selected from calcium phosphate, boron nitride and titanium dioxide in a mass ratio of 8-10:1:1.

[0016] By adopting the above technical solution, the specific composition and ratio of the anti-coagulation agent used in the bearing grease composition provided in this application are further defined, which can further improve the performance of the bearing grease composition provided in this application.

[0017] Optionally, the thickener includes at least one of polytetrafluoroethylene and nitrogen-based flame retardants, and the average particle size of the thickener is 0.1 to 5 μm.

[0018] By adopting the above technical solution, the composition of the thickener used in the bearing grease composition provided in this application is limited. One of polytetrafluoroethylene and nitrogen-based flame retardant with good high-temperature stability is selected as the thickener, which can further ensure that the bearing grease composition provided in this application can provide a long-lasting lubrication effect in high-temperature environments. At the same time, the particle size of the thickener is further limited, which can make the particle distribution of the thickener in the bearing grease composition provided in this application more uniform, thereby forming a more stable lubricating film and improving the lubrication effect.

[0019] Optionally, the corrosion and rust inhibitor includes a metal deactivator.

[0020] By adopting the above technical solutions, corrosion of metal parts under high-temperature conditions can be further avoided.

[0021] Optionally, the average particle size of the anticoagulant is 1–10 μm.

[0022] By adopting the above technical solution, the uniformity of the distribution of the anti-coagulation agent can be further improved, and the phenomenon of polymerization and coagulation of the bearing grease composition provided in this application can be further avoided under high temperature conditions.

[0023] Optionally, the friction reducer has an average particle size of 0.05–5 μm.

[0024] By adopting the above technical solution, the uniformity of friction reducer distribution can be further improved, and the phenomenon of precipitation and stratification of friction reducer in the bearing grease composition provided in this application can be avoided.

[0025] Secondly, this application provides a method for preparing the above-mentioned bearing grease composition, comprising the following steps:

[0026] S1. Provide fluorinated base oil, thickener, anti-coagulation agent and additives according to mass fraction; take 60-80% of the total amount of the fluorinated base oil, stir and heat to 150-160°C, then add the thickener and the anti-coagulation agent in sequence, and stir at a constant temperature of 150-160°C for 1-2 hours to obtain mixture one;

[0027] S2. Add the remaining fluorinated base oil to the first mixture, cool it to 85-95°C, add the additive, and stir at a constant temperature of 85-95°C for 0.5-2 hours to obtain the second mixture.

[0028] S3. Take the mixture material II, grind it, degas it, and obtain the bearing grease composition.

[0029] By adopting the above technical solution, the method for preparing the bearing grease composition provided in this application, which involves adding the fluorinated base oil separately, allows the thickener and anti-coagulation agent to be better dispersed in the fluorinated base oil, thereby improving the dispersibility and stability of the thickener and anti-coagulation agent. Simultaneously, adding the thickener and anti-coagulation agent after the first addition of the fluorinated base oil ensures thorough mixing between the fluorinated base oil and the thickener and anti-coagulation agent. The subsequent second addition of the fluorinated base oil further adjusts the viscosity of the resulting bearing grease composition, thus optimizing its performance.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. The bearing grease composition provided in this application has excellent colloidal stability and high-temperature performance. It has a stable structure at high temperatures, low evaporation loss, long service life, and good lubrication and noise reduction properties for high-temperature bearings. It can meet the lubrication needs of equipment that is in operation at high temperatures for a long time.

[0032] 2. In the bearing grease composition provided in this application, the anti-coagulation agent can effectively solve the problem of easy polymerization and coagulation of fluorinated grease under high temperature conditions, thereby improving the high-temperature anti-coagulation performance of the bearing grease composition provided in this application; the addition of friction reducer and corrosion and rust inhibitor makes the bearing grease composition have good anti-corrosion performance while having both high-temperature performance and anti-wear and friction-reducing performance, and will not cause corrosion of metal parts under high temperature conditions.

[0033] 3. In the method for preparing the bearing grease composition provided in this application, the step sequence of adding the fluorinated base oil separately allows the thickener and anti-coagulation agent to be better dispersed in the fluorinated base oil, thereby improving the dispersibility and stability of the thickener and anti-coagulation agent. At the same time, it also facilitates the adjustment of the viscosity of the prepared bearing grease composition after the fluorinated base oil is fully mixed with the thickener and anti-coagulation agent, thereby optimizing the performance of the prepared bearing grease composition. Detailed Implementation

[0034] The present application will be further described in detail below with reference to preparation examples, embodiments and comparative examples.

[0035] This application designs a bearing grease composition comprising the following raw material components by mass fraction: 37-87.9 wt% fluorinated base oil, 10-40 wt% thickener, 2-18 wt% anti-coagulation agent, and 0.1-5 wt% additives;

[0036] The anticoagulant includes calcium phosphate;

[0037] The additives include friction reducers and corrosion and rust inhibitors, wherein the friction reducers include at least one of molybdenum disulfide, carbon fluoride, and fluorinated graphene.

[0038] The bearing grease composition of this application is prepared by the following method, including the following steps:

[0039] S1. Provide fluorinated base oil, thickener, anti-coagulation agent and additives according to mass fraction; take 60-80% of the total amount of the fluorinated base oil, stir and heat to 150-160°C, then add the thickener and the anti-coagulation agent in sequence, and stir at a constant temperature of 150-160°C for 1-2 hours to obtain mixture one;

[0040] S2. Add the remaining fluorinated base oil to the first mixture, cool it to 85-95°C, add the additive, and stir at a constant temperature of 85-95°C for 0.5-2 hours to obtain the second mixture.

[0041] S3. Take the mixture material II, grind it, degas it, and obtain the bearing grease composition. Specific Implementation

[0043] Unless otherwise specified, all raw materials used in the preparation examples, embodiments, and comparative examples of this application are commercially available products:

[0044] Fluorinated base oil: kinematic viscosity at 40℃ is 200–1500 mm. 2 / s;

[0045] Thickener: Polytetrafluoroethylene, whiteness ≥95, purity 99%; Nitrogen-based flame retardant, whiteness ≥95, active ingredient content 100%; Anti-coagulation agent: Calcium phosphate, powder, purity 99%; Boron nitride, powder, purity 99%; Titanium dioxide, powder, purity 99%.

[0046] Friction reducers: molybdenum disulfide, powder, 99% purity; carbon fluoride, powder, 99% purity; fluorinated graphene, powder, fluorine-to-carbon ratio > 1.0, 99% purity;

[0047] Corrosion and rust inhibitor: Metal deactivator, Shandong Boschwen New Materials Co., Ltd., model T561.

[0048] The following are preparation examples 1-4, examples 1-27, and comparative examples 1-2 of this application. Among them, preparation examples 1-4 provide a method for preparing a bearing grease composition, and examples 1-27 and comparative examples 1-2 provide a bearing grease composition.

[0049] When conducting experimental tests on the bearing grease compositions provided in Examples 1-27 and Comparative Examples 1-2, the test items and test methods are as follows:

[0050] 1. Appearance: Visually inspect the condition of the bearing grease composition;

[0051] 2. High-temperature anti-coagulation: Heat the bearing grease composition to 350℃ and observe whether the bearing grease composition is stable and whether coagulation occurs;

[0052] 3. Cone penetration: The test method refers to GB / T 269;

[0053] 4. Evaporation: The test method is in accordance with SH / T 0337, and the test conditions are 300℃×4h;

[0054] 5. Corrosion: The test method is in accordance with GB / T 7326, and the test conditions are: T2 copper sheet, 100℃×24h;

[0055] 6. Oil separation of stencil: The test method is in accordance with SH / T 0324, and the test conditions are 200℃×24h;

[0056] 7. Wear scar diameter: The test method is in accordance with SH / T 0202, and the test conditions are: 40kg×30min×75℃;

[0057] 8.P B Value: The detection method refers to SH / T 0202.

[0058] Preparation Example 1

[0059] Provide fluorinated base oil, thickener, anti-coagulation agent, and additives according to mass fraction; take 60% of the total fluorinated base oil, stir and heat to 150℃, then add thickener, stir for 10 minutes, then add anti-coagulation agent, stir, and maintain the temperature at 150℃ for 2 hours to obtain mixture one; add the remaining fluorinated base oil to mixture one, cool to 85℃, then add additives, and maintain the temperature at 85℃ for 2 hours to obtain mixture two; take mixture two, grind it three times on a three-roll mill, and degas it using a vacuum degassing device to obtain a bearing grease composition.

[0060] Preparation Example 2

[0061] Provide fluorinated base oil, thickener, anti-coagulation agent, and additives according to mass fraction; take 70% of the total fluorinated base oil, stir and heat to 155℃, then add thickener, stir for 10 minutes, then add anti-coagulation agent, stir, and maintain the temperature at 155℃ for 1.5 hours to obtain mixture one; add the remaining fluorinated base oil to mixture one, cool to 90℃, then add additives, and maintain the temperature at 90℃ for 1 hour to obtain mixture two; take mixture two, grind it three times on a three-roll mill, and degas it using a vacuum degassing device to obtain a bearing grease composition.

[0062] Preparation Example 3

[0063] Provide fluorinated base oil, thickener, anti-coagulation agent, and additives according to mass fraction; take 80% of the total fluorinated base oil, stir and heat to 160℃, then add thickener, stir for 10 minutes, then add anti-coagulation agent, stir, and maintain the temperature at 160℃ for 1 hour to obtain mixture one; add the remaining fluorinated base oil to mixture one, cool to 95℃, then add additives, and maintain the temperature at 95℃ for 0.5 hours to obtain mixture two; take mixture two, grind it three times on a three-roll mill, and degas it using a vacuum degassing device to obtain a bearing grease composition.

[0064] Preparation Example 4

[0065] Based on Preparation Example 2, the difference between this preparation example and Preparation Example 2 is that:

[0066] Take 100% of the total amount of fluorinated base oil, stir and heat to 155℃, then add thickener, stir for 10 minutes, then add anti-coagulation agent, stir, and keep the temperature at 155℃ for 1.5 hours to obtain mixture one; cool mixture one to 90℃, then add additives, and keep the temperature at 90℃ for 1 hour to obtain mixture two.

[0067] The remaining steps, conditions, and parameters are the same as in Preparation Example 2.

[0068] The bearing grease compositions provided in Examples 1-4 were prepared using the same method as those provided in Examples 1-4. The mass percentages of the raw material components in the bearing grease compositions provided in Examples 1-4 were as follows: 37 wt% fluorinated base oil, 40 wt% thickener, 18 wt% anti-coagulation agent, 4.9 wt% friction reducer, and 0.1 wt% corrosion and rust inhibitor. The friction reducer and corrosion and rust inhibitor constituted additives. The perfluoropolyether oil was selected from oils with a kinematic viscosity of 200 mmHg at 40°C. 2 / s of perfluoropolyether oil; the thickener is selected from polytetrafluoroethylene with an average particle size of 5μm; the anti-coagulation agent is selected from calcium phosphate with an average particle size of 10μm; the friction reducer is selected from molybdenum disulfide with an average particle size of 5μm; the corrosion and rust inhibitor is selected from metal deactivators.

[0069] Experimental testing

[0070] The bearing grease compositions provided in Examples 1 to 4 were tested experimentally, and the test results are recorded in Table 1.

[0071] Table 1 Summary of test results for Examples 1-4

[0072]

[0073] Referring to Table 1, the test results in Table 1 show that the bearing grease composition provided in this application can still maintain a stable and non-condensing state at temperatures as high as 350°C, which demonstrates that the bearing grease composition provided in this application has excellent high-temperature stability. Specifically, the overall performance of the bearing grease compositions provided in Examples 1 to 3 is better than that of the bearing grease composition provided in Example 4, which demonstrates the superiority of preparing the bearing grease composition using a specific sequence of steps.

[0074] Examples 5-8 and Comparative Examples 1-2

[0075] Based on Example 2, the differences between Examples 5-8 and Comparative Examples 1-2 and Example 2 are: the mass fraction of the raw material components are different, see Table 2; the remaining steps, conditions and parameters are the same as in Example 2.

[0076] Table 2 Raw material components of Examples 2, 5-8 and Comparative Examples 1-2

[0077]

[0078] Experimental testing

[0079] The bearing grease compositions provided in Examples 5-8 and Comparative Examples 1-2 were tested experimentally, and the test results are recorded in Table 3.

[0080] Table 3 Summary of test results for Examples 5-8

[0081]

[0082] Referring to Table 3, the test results in Table 3 show that the bearing grease compositions provided in Examples 5 to 8 all have excellent high-temperature stability, as well as excellent fluidity, lubrication performance, and anti-corrosion and anti-rust performance. Specifically, the overall performance of the bearing grease compositions provided in Examples 5 to 8 is better than that of the bearing grease compositions provided in Comparative Examples 1 to 2, which illustrates the superiority of using specific raw material components to prepare bearing grease compositions.

[0083] Example 9

[0084] Based on Example 6, the difference between this example and Example 6 is that the perfluoropolyether oil is selected from oils with a kinematic viscosity of 680 mmHg at 40°C. 2 / s of perfluoropolyether oil; the remaining steps, conditions and parameters are the same as in Example 6.

[0085] Example 10

[0086] Based on Example 6, the difference between this example and Example 6 is that the perfluoropolyether oil is selected from those with a kinematic viscosity of 1500 mmHg at 40°C. 2 / s of perfluoropolyether oil; the remaining steps, conditions and parameters are the same as in Example 6.

[0087] Example 11

[0088] Based on Example 6, the difference between this example and Example 6 is that the perfluoropolyether oil is selected from oils with a mass ratio of 2.2:1 and a kinematic viscosity of 680 mmHg at 40°C. 2 / s of perfluoropolyether oil and a kinematic viscosity of 1000 mm at 40°C 2 / s of perfluoropolyether oil; the remaining steps, conditions and parameters are the same as in Example 6.

[0089] Example 12

[0090] Based on Example 6, the difference between this example and Example 6 is that the perfluoropolyether oil is selected from oils with a mass ratio of 0.8:1 and a kinematic viscosity of 680 mmHg at 40°C. 2 / s of perfluoropolyether oil and a kinematic viscosity of 1200 mm at 40°C. 2 / s of perfluoropolyether; the remaining steps, conditions and parameters are the same as in Example 6.

[0091] Example 13

[0092] Based on Example 6, the difference between this example and Example 6 is that the perfluoropolyether oil is selected from oils with a mass ratio of 1.3:1 and a kinematic viscosity of 680 mmHg at 40°C. 2 / s of perfluoropolyether oil and a kinematic viscosity of 1500 mm at 40°C. 2 / s of perfluoropolyether oil; the remaining steps, conditions and parameters are the same as in Example 6.

[0093] Experimental testing

[0094] The bearing grease compositions provided in Examples 9 to 13 were tested experimentally, and the test results are recorded in Table 4.

[0095] Table 4 Summary of test results for Examples 9-13

[0096]

[0097]

[0098] Referring to Table 4, the test results in Table 4 show that the bearing grease compositions provided in Examples 9 to 13 all have excellent high-temperature stability, as well as excellent fluidity, lubrication performance, and corrosion and rust prevention performance. Specifically, the overall performance of the bearing grease compositions provided in Examples 11 to 13 is better than that of the bearing grease compositions provided in Examples 9 to 10, which demonstrates the superiority of using a specific ratio of perfluoropolyether oil to prepare the bearing grease composition.

[0099] Example 14

[0100] Based on Example 13, the difference between this example and Example 13 is that the anticoagulant is selected from calcium phosphate and boron nitride in a mass ratio of 1:1, and the average particle size of both calcium phosphate and boron nitride is 10 μm; the remaining steps, conditions and parameters are the same as in Example 13.

[0101] Example 15

[0102] Based on Example 13, the difference between this example and Example 13 is that the anticoagulant is selected from calcium phosphate and titanium dioxide in a mass ratio of 1:1, and the average particle size of both calcium phosphate and titanium dioxide is 10 μm; the remaining steps, conditions and parameters are the same as in Example 13.

[0103] Example 16

[0104] Based on Example 13, the difference between this example and Example 13 is that the anticoagulant is selected from calcium phosphate, boron nitride and titanium dioxide in a mass ratio of 8:1:1, and the average particle size of calcium phosphate, boron nitride and titanium dioxide is 10 μm; the remaining steps, conditions and parameters are the same as in Example 13.

[0105] Example 17

[0106] Based on Example 13, the difference between this example and Example 13 is that the anticoagulant is selected from calcium phosphate and titanium dioxide in a mass ratio of 9:1:1, and the average particle size of calcium phosphate, boron nitride and titanium dioxide is 10 μm; the remaining steps, conditions and parameters are the same as in Example 13.

[0107] Example 18

[0108] Based on Example 13, the difference between this example and Example 13 is that the anticoagulant is selected from calcium phosphate and titanium dioxide in a mass ratio of 10:1:1, and the average particle size of calcium phosphate, boron nitride and titanium dioxide is 10 μm; the remaining steps, conditions and parameters are the same as in Example 13.

[0109] Experimental testing

[0110] The bearing grease compositions provided in Examples 14-18 were tested experimentally, and the test results are recorded in Table 5.

[0111] Table 5 Summary of test results for Examples 14-18

[0112]

[0113] Referring to Table 5, the test results in Table 5 show that the bearing grease compositions provided in Examples 14 to 18 all have excellent high-temperature stability, as well as excellent fluidity, lubrication performance, and anti-corrosion and anti-rust performance. This demonstrates the superiority of the anti-coagulation agent used in the bearing grease compositions provided in this application.

[0114] Example 19

[0115] Based on Example 17, the difference between this example and Example 17 is that the friction reducer is selected from fluorinated carbon with an average particle size of 5 μm; the remaining steps, conditions and parameters are the same as in Example 17.

[0116] Example 20

[0117] Based on Example 17, the difference between this example and Example 17 is that the friction reducing agent is selected from fluorinated graphene with an average particle size of 5 μm; the remaining steps, conditions and parameters are the same as in Example 17.

[0118] Example 21

[0119] Based on Example 17, the difference between this example and Example 17 is that the friction reducer is selected from molybdenum disulfide and carbon fluoride in a mass ratio of 1:3, and the average particle size of molybdenum disulfide and carbon fluoride is 5 μm; the remaining steps, conditions and parameters are the same as in Example 17.

[0120] Example 22

[0121] Based on Example 17, the difference between this example and Example 17 is that the friction reducing agent is selected from molybdenum disulfide and fluorinated graphene in a mass ratio of 1:0.1, and the average particle size of molybdenum disulfide and fluorinated graphene is 5 μm; the remaining steps, conditions and parameters are the same as in Example 17.

[0122] Example 23

[0123] Based on Example 17, the difference between this example and Example 17 is that the friction reducing agent is selected from molybdenum disulfide, carbon fluoride and fluorinated graphene in a mass ratio of 2:0.5:0.3, and the average particle size of molybdenum disulfide, carbon fluoride and fluorinated graphene is 5 μm; the remaining steps, conditions and parameters are the same as in Example 17.

[0124] Experimental testing

[0125] The bearing grease compositions provided in Examples 19-23 were tested experimentally, and the test results are recorded in Table 6.

[0126] Table 6 Summary of test results for Examples 19-23

[0127]

[0128] Referring to Table 6, the test results in Table 6 show that the bearing grease compositions provided in Examples 19 to 23 all have excellent high-temperature stability, as well as excellent fluidity, lubrication performance, and anti-corrosion and anti-rust performance, which demonstrates the superiority of the friction reducer used in the bearing grease compositions provided in this application.

[0129] Example 24

[0130] Based on Example 23, the difference between this example and Example 23 is that the thickener is selected from a nitrogen-based flame retardant with an average particle size of 5 μm; the remaining steps, conditions and parameters are the same as in Example 23.

[0131] Example 25

[0132] Based on Example 23, the difference between this example and Example 23 is that the thickener is selected from polytetrafluoroethylene and nitrogen-based flame retardant in a mass ratio of 2:1, and the average particle size of both polytetrafluoroethylene and nitrogen-based flame retardant is 5 μm; the remaining steps, conditions and parameters are the same as in Example 23.

[0133] Experimental testing

[0134] The bearing grease compositions provided in Examples 24-25 were tested experimentally, and the test results are recorded in Table 7.

[0135] Table 7 Summary of test results for Examples 24-25

[0136]

[0137] Referring to Table 7, the test results in Table 7 show that the bearing grease compositions provided in Examples 24-25 all have excellent high-temperature stability, as well as excellent fluidity, lubrication performance, and anti-corrosion and anti-rust performance, which demonstrates the superiority of the thickener used in the bearing grease compositions provided in this application.

[0138] Example 26

[0139] Based on Example 25, the difference between this example and Example 24 is that the average particle size of calcium phosphate, boron nitride and titanium dioxide is 5 μm, the average particle size of molybdenum disulfide, carbon fluoride and fluorinated graphene is 0.25 μm, and the average particle size of polytetrafluoroethylene and nitrogen-based flame retardant is 3 μm; the remaining steps, conditions and parameters are the same as in Example 25.

[0140] Example 27

[0141] Based on Example 25, the difference between this example and Example 24 is that the average particle size of calcium phosphate, boron nitride and titanium dioxide is 1 μm, the average particle size of molybdenum disulfide, carbon fluoride and fluorinated graphene is 0.05 μm, and the average particle size of polytetrafluoroethylene and nitrogen-based flame retardant is 0.1 μm; the remaining steps, conditions and parameters are the same as in Example 25.

[0142] Experimental testing

[0143] The bearing grease compositions provided in Examples 26 and 27 were tested experimentally, and the test results are recorded in Table 8.

[0144] Table 8 Summary of test results in Examples 26-27

[0145]

[0146] Referring to Table 8, the test results in Table 8 show that the bearing grease compositions provided in Examples 26-27 all have excellent high-temperature stability, as well as excellent fluidity, lubrication performance, and anti-corrosion and anti-rust performance. This demonstrates the superiority of the bearing grease compositions provided in this application in limiting the average particle size of the anti-coagulant, thickener, and friction reducer.

[0147] In summary, the bearing grease composition provided in this application has significant advantages and can meet the lubrication needs of equipment operating under high-temperature conditions for extended periods.

[0148] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bearing grease composition, characterized in that, It is composed of the following raw materials by mass fraction: 37~87.9 wt% fluorinated base oil, 10~40 wt% thickener, 2~18 wt% anti-coagulation agent, and 0.1~5 wt% additives; The additives include friction reducers and corrosion and rust inhibitors, wherein the friction reducers include at least one of molybdenum disulfide and carbon fluoride; The fluorinated base oil is a perfluoropolyether oil, selected from oils with a mass ratio of 0.8 to 2.2:1 and a kinematic viscosity of 680 mmHg at 40°C. 2 / s of perfluoropolyether oil and a kinematic viscosity of 1000~1500 mm at 40℃ 2 / s of perfluoropolyether oil; The anticoagulant is selected from calcium phosphate, boron nitride, and titanium dioxide in a mass ratio of 8~10:1:1; The thickener includes at least one of polytetrafluoroethylene and a nitrogen-based flame retardant.

2. The bearing grease composition according to claim 1, characterized in that, The thickeners all have an average particle size of 0.1~5μm; the friction reducers include fluorinated graphene.

3. The bearing grease composition according to claim 1, characterized in that, The corrosion and rust inhibitors include metal deactivators.

4. The bearing grease composition according to claim 1, characterized in that, The average particle size of the anticoagulant is 1~10μm.

5. The bearing grease composition according to claim 1, characterized in that, The friction reducer has an average particle size of 0.05~5μm.

6. A method for preparing the bearing grease composition according to claim 1, characterized in that, Includes the following steps: S1. Provide fluorinated base oil, thickener, anti-coagulation agent and additives according to mass fraction; take 60~80% of the total amount of the fluorinated base oil, stir and heat to 150~160℃, then add the thickener and the anti-coagulation agent in sequence, and stir at a constant temperature of 150~160℃ for 1~2 hours to obtain mixture one; S2. Add the remaining fluorinated base oil to the first mixture, cool it to 85~95℃, then add the additive, and stir at a constant temperature of 85~95℃ for 0.5~2h to obtain the second mixture. S3. Take the mixture material II, grind it, degas it, and obtain the bearing grease composition.

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