A high-speed heavy-load bearing grease composition and its preparation method and application

Abstract

The present invention relates to the field of grease technology, and in particular to a high-speed heavy-load bearing grease composition and a preparation method and application thereof. The grease composition comprises: a base oil, a thickener and a high extreme pressure proton type ionic liquid; wherein the base oil comprises mineral oil and synthetic oil; the thickener comprises 12-hydroxy stearic acid lithium soap and C 18 ~C 23 The present invention can significantly improve the mechanical stability and high and low temperature performance of the grease by optimizing the compounding system of the grease composition, and meet the lubrication requirements of bearings under high speed and heavy load conditions while maintaining various performances.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating grease, and in particular to a high-speed heavy-load bearing lubricating grease composition and a preparation method and application thereof. Background Art

[0002] At present, society cannot do without various mechanical equipment. No matter how complex the mechanical equipment is, it is composed of various basic connectors and transmission parts. For example: motors, gears, bearings, belts, etc. Bearings are mainly used to reduce the mechanical load friction coefficient of the equipment during the transmission process. During the movement of the bearing, in order to reduce friction, buffer pressure, and extend the service life of the bearing, lubricating oil or grease is required. Grease is used to reduce the friction resistance of the friction pair and slow down the wear of the friction pair. It can also play a role in cooling, cleaning and preventing pollution.

[0003] With the development of modern engineering construction and industry, large-scale mechanical equipment and construction equipment continue to emerge, and are developing in the direction of high speed and heavy load. The application scope of high-speed and heavy-load bearings is getting wider and wider. High-speed and heavy-load bearings are mostly installed in the key parts of large equipment. Their use effect is directly related to the service life and economic life of the equipment. If the bearing fails, the equipment maintenance cycle is long and the cost is high, which will not only affect the normal production operation, but also bring huge economic losses. Analysis of the causes of bearing damage shows that about 40% of bearing damage is related to poor lubrication. For most equipment, the main means to solve friction and wear is to strengthen lubrication. Therefore, the lubrication of high-speed and heavy-load bearings is very important. Whether the lubricating material selection is reasonable will directly affect the quality of equipment operation.

[0004] Therefore, under the premise of ensuring the stability of various properties of grease, how to simultaneously improve the high speed and load-bearing capacity of grease has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] At present, the existing technologies related to grease are difficult to meet the high speed and high load conditions at the same time. Specifically, at this stage, high-speed grease usually uses low-viscosity base oil to effectively reduce the bearing temperature at high speed, but the low base oil viscosity cannot form a stable oil film. Under heavy load conditions, the oil film is easy to break, resulting in direct contact between the friction pair and affecting the service life of the bearing; heavy-load extreme pressure grease usually uses high-viscosity base oil and adds a large amount of sulfur, chlorine, and phosphorus type extreme pressure anti-wear agents to meet the heavy load conditions, but the base oil viscosity is large, which can easily cause the high-speed bearing shaft temperature to be too high and the additives to be inactivated at high temperatures, affecting the lubrication performance. After a lot of research, the present invention unexpectedly found that the use of long carbon chain dibasic acid lithium soap and 12-hydroxystearic acid lithium soap as thickeners, mineral oil and synthetic oil as compound base oils can significantly improve the mechanical stability and high and low temperature performance of the grease; at the same time, combined with high extreme pressure proton ionic liquids, the functions of each component can be further fully exerted, which is conducive to meeting the use requirements of high-speed and heavy-loaded bearings.

[0006] Based on this, the specific technical solutions of the present invention are as follows:

[0007] The present invention first provides a grease composition, comprising: a base oil, a thickener and a high extreme pressure proton type ionic liquid;

[0008] Wherein, the base oil includes mineral oil and synthetic oil;

[0009] The thickener includes 12-hydroxystearate lithium soap and C 18 ~C 23 Long carbon chain dibasic acid lithium soap.

[0010] The present invention finds that when 12-hydroxystearate lithium soap and the long carbon chain dibasic acid lithium soap with the above carbon number are used as thickeners and the compounded base oil is combined with the high extreme pressure proton type ionic liquid, the mechanical stability and high and low temperature performance of the grease can be significantly improved, and the lubrication requirements of bearings under high speed and heavy load conditions can be met while maintaining the stability of various performances.

[0011] Preferably, 12-hydroxystearate lithium soap and the C 18 ~C 23 The mass ratio of the long carbon chain dibasic acid lithium soap is 1 to 5:1.

[0012] More preferably, 12-hydroxystearate lithium soap and the C 18 ~C 23 The mass ratio of long carbon chain dibasic acid lithium soap is 3 to 5:1.

[0013] Preferably, the high extreme pressure proton type ionic liquid has the general structural formula A + B - , where A +is an organic cation, B - is an organic anion, the organic cation is an alkylamine cation, and the anion is a borate anion.

[0014] More preferably, the organic cation is a quaternary ammonium salt cation, and the anion is a tetrafluoroborate anion.

[0015] Preferably, the preparation method of the high extreme pressure proton type ionic liquid comprises:

[0016] The borate substance and the alkylamine substance are uniformly mixed, and after adding a solvent, heat treatment is performed at 110° C. to 120° C. After the reaction is completed, the solvent is removed by vacuum distillation to obtain an ionic liquid.

[0017] Preferably, based on the total mass of the grease composition, the amount of the high extreme pressure proton type ionic liquid is 2 to 6 wt %.

[0018] Preferably, in the base oil, the mass ratio of the mineral oil to the synthetic oil is 25-50:50-75.

[0019] Preferably, when the mass ratio of the mineral oil to the synthetic oil is 30-40:60-70, the comprehensive performance of the grease is better.

[0020] Preferably, the base oil has a viscosity of 90 to 120 mm at 40°C. 2 / s.

[0021] Preferably, the thickener is 12-hydroxystearic acid, C 18 ~C 23 The long carbon chain dibasic acid is saponified with lithium hydroxide and calcium hydroxide; 12-hydroxystearic acid, C 18 ~C 23 The mass ratio of the total amount of long carbon chain dibasic acid to lithium hydroxide and calcium hydroxide is 10:1-3.

[0022] Preferably, the grease composition comprises the following components in parts by weight:

[0023] 60-85 parts of base oil;

[0024] Thickener 8-16 parts;

[0025] 2 to 6 parts of high extreme pressure proton type ionic liquid.

[0026] Preferably, the grease composition further contains an antioxidant, wherein the antioxidant comprises diphenylamine and N-phenyl-α-naphthylamine in a mass ratio of 1:(1-3).

[0027] Preferably, the grease composition further contains a rust inhibitor, which includes benzotriazole and sorbitan monooleate in a mass ratio of 1: (1-10).

[0028] Preferably, the grease composition comprises the following components in parts by weight:

[0029]

[0030]

[0031] The present invention further provides a method for preparing the grease composition, comprising:

[0032] (1) mixing part of the compound base oil with 12-hydroxystearic acid and a long carbon chain dibasic acid, and heating the materials to dissolve them; then adding part of the lithium hydroxide solution and the calcium hydroxide solution, and performing a first heat preservation at 90 to 100° C.;

[0033] (2) then adding the remaining lithium hydroxide solution and calcium hydroxide solution, and continuing to heat to 100-110° C. for a second heat preservation; after the heat preservation is completed, heating to 205-215° C. for a third heat preservation;

[0034] (3) adding part of the compound base oil for rapid cooling, and then performing the fourth heat preservation after rapid cooling; then sequentially adding the ionic liquid, the rust inhibitor and the antioxidant, and performing degassing after filtering and homogenization;

[0035] (4) After post-processing, the product is canned through a filling pipeline.

[0036] Preferably, the first heat preservation time is 85 to 95 minutes;

[0037] The second heat preservation time is 85 to 95 minutes;

[0038] The third heat preservation time is 1 to 5 minutes;

[0039] The fourth heat preservation time is 25 to 35 minutes.

[0040] The invention also provides application of the lubricating grease composition in high-speed and heavy-load bearings.

[0041] Based on the above technical solution, the beneficial effects of the present invention are:

[0042] The present invention can significantly improve the mechanical stability and high and low temperature performance of the grease by optimizing the compounding system of the grease composition, and meet the lubrication requirements of bearings under high speed and heavy load conditions while maintaining various performances stable. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Unless otherwise specified, all raw materials used in the examples are commercially available conventional raw materials, and the technical means used are conventional means well known to those skilled in the art.

[0045] In the following examples, the viscosity of the compound base oil at 40°C is between 90 and 120 mm 2 / s or less.

[0046] Example 1

[0047] This embodiment first provides a grease composition, comprising the following components in parts by weight:

[0048] (1) Compound base oil: 65 parts, of which the mass ratio of mineral oil to synthetic oil is 38:62.

[0049] (2) Mixed soap thickener: 25 parts, wherein the mass ratio of 12-hydroxystearate lithium soap and heneicosadicarboxylic acid lithium soap is 5:1.

[0050] (3) Antioxidant: 1.0 part, wherein the mass ratio of diphenylamine to N-phenyl-α-naphthylamine is 1:1.

[0051] (4) High extreme pressure proton type ionic liquid: 2.0 parts.

[0052] (5) Rust inhibitor: 1.0 part, wherein the mass ratio of benzotriazole to sorbitan monooleate is 1:3.

[0053] This embodiment further provides a method for preparing the grease composition, comprising the following steps:

[0054] Before production, 42.5 kg of lithium hydroxide was diluted with 200 kg of water and heated for standby use; 300 kg of compound base oil was put into the reactor; 250 kg of 12-hydroxystearic acid, 50kg of henone-carbon dibasic acid, stir and heat the materials, add part of lithium hydroxide and calcium hydroxide solution after the materials are completely dissolved, continue to heat to 95°C, keep constant temperature at this temperature for 1.5 hours, then continue to heat to 105°C, add the remaining lithium hydroxide solution, and keep constant temperature at this temperature for 1.5 hours; continue to heat to 210°C, keep constant temperature for 3 minutes, add 400kg of compound base oil for rapid cooling, and keep constant temperature for 30 minutes after rapid cooling; after the temperature drops to below 160°C, add 12kg of antioxidant; when the temperature drops to 100°C, add 20kg of high extreme pressure proton type ionic liquid and 12kg of rust inhibitor in sequence, carry out circulation filtration, and homogenize with a homogenizer at the same time; after filtration and homogenization, degassing is carried out; after post-treatment is completed and the appearance is qualified, it is canned through the filling pipeline, thereby preparing sample 1.

[0055] Example 2

[0056] This embodiment first provides a grease composition, comprising the following components in parts by weight:

[0057] (1) Compound base oil: 70 parts, of which the mass ratio of mineral oil to synthetic oil is 38:62.

[0058] (2) Mixed soap thickener: 20 parts, wherein the mass ratio of 12-hydroxystearate lithium soap and heneicosadicarboxylic acid lithium soap is 4.5:1.

[0059] (3) Antioxidant: 1.5 parts, wherein the mass ratio of diphenylamine to N-phenyl-α-naphthylamine is 1:1.5.

[0060] (4) High extreme pressure proton type ionic liquid: 2.5 parts.

[0061] (5) Rust inhibitor: 1.5 parts, wherein the mass ratio of benzotriazole to sorbitan monooleate is 1:5.

[0062] This embodiment further provides a method for preparing the grease composition, comprising the following steps:

[0063] Before production, 50 kg of lithium hydroxide was diluted with 250 kg of water and heated for standby use; 350 kg of compound base oil was put into the reactor; 270 kg 12-hydroxystearic acid, 60kg of henone-carbon dibasic acid, stir and heat the materials, add part of lithium hydroxide and calcium hydroxide solution after the materials are completely dissolved, continue to heat to 95°C, keep constant temperature at this temperature for 1.5 hours, then continue to heat to 105°C, add the remaining lithium hydroxide solution, and keep constant temperature at this temperature for 1.5 hours; continue to heat to 210°C, keep constant temperature for 3 minutes, add 400kg of compound base oil for rapid cooling, and keep constant temperature for 30 minutes after rapid cooling; after the temperature drops to below 160°C, add 17kg of antioxidant; when the temperature drops to 100°C, add 30kg of high extreme pressure proton ionic liquid and 17kg of rust inhibitor in sequence, and carry out circulation filtration, and homogenize with a homogenizer at the same time; after filtration and homogenization, degassing is carried out; after post-treatment is completed and the appearance is qualified, it is canned through the filling pipeline, thereby preparing sample 2.

[0064] Example 3

[0065] This embodiment first provides a grease composition, comprising the following components in parts by weight:

[0066] (1) Compound base oil: 75 parts, of which the mass ratio of mineral oil to synthetic oil is 35:65.

[0067] (2) Mixed soap thickener: 15 parts, wherein the mass ratio of 12-hydroxystearate lithium soap and heneicosadicarboxylic acid lithium soap is 4:1.

[0068] (3) Antioxidant: 2 parts, wherein the mass ratio of diphenylamine to N-phenyl-α-naphthylamine is 1:2.

[0069] (4) High extreme pressure proton type ionic liquid: 3 parts.

[0070] (5) Rust inhibitor: 2 parts, wherein the mass ratio of benzotriazole to sorbitan monooleate is 1:6.

[0071] This embodiment further provides a method for preparing the grease composition, comprising the following steps:

[0072] Before production, 55 kg of lithium hydroxide was diluted with 270 kg of water and heated for standby use; 400 kg of compound base oil was put into the reactor; 300 kg of 12-hydroxystearic acid, 60kg of henone-carbon dibasic acid, stir and heat the materials, add part of lithium hydroxide and calcium hydroxide solution after the materials are completely dissolved, continue to heat to 95°C, keep constant temperature at this temperature for 1.5 hours, then continue to heat to 105°C, add the remaining lithium hydroxide solution, and keep constant temperature at this temperature for 1.5 hours; continue to heat to 210°C, keep constant temperature for 3 minutes, add 400kg of compound base oil for rapid cooling, and keep constant temperature for 30 minutes after rapid cooling; after the temperature drops to below 160°C, add 24kg of antioxidant; when the temperature drops to 100°C, add 36kg of high extreme pressure proton type ionic liquid and 24kg of rust inhibitor in turn, and carry out circulation filtration, and homogenize with a homogenizer at the same time; after filtration and homogenization, degassing treatment is carried out; after post-treatment is completed and the appearance is qualified, canning is carried out through the filling pipeline, thereby obtaining sample 3.

[0073] Example 4

[0074] This embodiment first provides a grease composition, comprising the following components in parts by weight:

[0075] (1) Compound base oil: 80 parts, of which the mass ratio of mineral oil to synthetic oil is 35:65.

[0076] (2) Mixed soap thickener: 10 parts, wherein the mass ratio of 12-hydroxystearate lithium soap and heneicosadicarboxylic acid lithium soap is 4:1.

[0077] (3) Antioxidant: 2 parts, wherein the mass ratio of diphenylamine to N-phenyl-α-naphthylamine is 1:2.

[0078] (4) High extreme pressure proton type ionic liquid: 3 parts.

[0079] (5) Rust inhibitor: 2 parts, wherein the mass ratio of benzotriazole to sorbitan monooleate is 1:6.

[0080] This embodiment further provides a method for preparing the grease composition, comprising the following steps:

[0081] Before production, 55 kg of lithium hydroxide was diluted with 270 kg of water and heated for standby use; 400 kg of compound base oil was put into the reactor; 385 kg of 12-hydroxystearic acid, 77kg of henene dicarboxylic acid, stir and heat the materials, add part of lithium hydroxide and calcium hydroxide solution after the materials are completely dissolved, continue to heat to 95°C, keep constant temperature at this temperature for 1.5 hours, then continue to heat to 105°C, add the remaining lithium hydroxide solution, and keep constant temperature at this temperature for 1.5 hours; continue to heat to 210°C, keep constant temperature for 3 minutes, add 400kg of compound base oil for rapid cooling, and keep constant temperature for 30 minutes after rapid cooling; after the temperature drops to below 160°C, add 26kg of antioxidant; when the temperature drops to 100°C, add 39kg of high extreme pressure proton ionic liquid and 26kg of rust inhibitor in sequence, and carry out circulation filtration, and homogenize with a homogenizer at the same time; after filtration and homogenization, degassing is carried out; after post-treatment is completed and the appearance is qualified, it is canned through the filling pipeline, thereby preparing sample 4.

[0082] Example 5

[0083] This embodiment first provides a grease composition, comprising the following components in parts by weight:

[0084] (1) Compound base oil: 85 parts, of which the mass ratio of mineral oil to synthetic oil is 40:60.

[0085] (2) Mixed soap thickener: 8 parts, of which the mass ratio of 12-hydroxystearate lithium soap and heneicosadicarboxylic acid lithium soap is 3:1.

[0086] (3) Antioxidant: 3 parts, wherein the mass ratio of diphenylamine to N-phenyl-α-naphthylamine is 1:3.

[0087] (4) High extreme pressure proton type ionic liquid: 4 parts.

[0088] (5) Rust inhibitor: 3 parts, wherein the mass ratio of benzotriazole to sorbitan monooleate is 1:8.

[0089] This embodiment further provides a method for preparing the grease composition, comprising the following steps:

[0090] Before production, 60 kg of lithium hydroxide was diluted with 300 kg of water and heated for standby use; 450 kg of compound base oil was put into the reactor; 315 kg of 12-hydroxystearic acid, 105kg of henone-carbon dibasic acid, stir and heat the materials, add part of lithium hydroxide and calcium hydroxide solution after the materials are completely dissolved, continue to heat to 95°C, keep constant temperature at this temperature for 1.5 hours, then continue to heat to 105°C, add the remaining lithium hydroxide solution, and keep constant temperature at this temperature for 1.5 hours; continue to heat to 210°C, keep constant temperature for 3 minutes, add 350kg of compound base oil for quenching, and keep constant temperature for 30 minutes after quenching; after the temperature drops to below 160°C, add 39kg of antioxidant; when the temperature drops to 100°C, add 42kg of high extreme pressure proton type ionic liquid and 39kg of rust inhibitor in turn, carry out circulation filtration, and homogenize with a homogenizer; after filtration and homogenization, degassing is carried out; after post-treatment is completed and the appearance is qualified, it is canned through the filling pipeline, thereby preparing sample 5.

[0091] Example 6

[0092] This embodiment provides a grease composition, which differs from the components and preparation method of Embodiment 1 only in that: in the thickener, the mass ratio of 12-hydroxystearate lithium soap and heneicosadicarboxylic acid lithium soap is 6:1.

[0093] Comparative Example 1

[0094] This comparative example provides a grease composition, which differs from the components and preparation method of Example 1 only in that the heneicosendicarboxylic acid lithium soap is replaced by an equal amount of pentadecadicarboxylic acid.

[0095] Comparative Example 2

[0096] This comparative example provides a grease composition, which differs from the components and preparation method of Example 1 only in that the compound base oil is replaced by an equal amount of mineral base oil.

[0097] Test example

[0098] The present invention further performs performance tests on the greases of the embodiments and comparative examples, as shown in Table 1.

[0099] Table 1

[0100]

[0101]

[0102]

[0103] The following conclusions can be drawn:

[0104] (1) From the data of extended working cone penetration and, the present invention has excellent mechanical stability, can meet the requirements of stable lubrication under high speed and heavy load conditions, and has better performance than the comparative example;

[0105] (2) From the corrosion and anti-corrosion test structures, it can be seen that the present invention has good protection performance and better provides protection for the bearing;

[0106] (3) From the dropping point and steel mesh oil separation data, it can be seen that the present invention has good high temperature resistance and can meet the requirements of temperature rise changes during the operation of the bearing. Compared with the comparative example, the performance is more advantageous;

[0107] (4) From the test data of water content and water loss, it can be seen that the present invention has a stable structure and good water resistance, and can meet the requirements of high-speed and heavy-load bearings in harsh working conditions and long life;

[0108] (5) From extreme pressure performance OK, P D and P B It can be seen from the data that the present invention has excellent extreme pressure performance, can meet the working requirements of high loads, and has better performance than the comparative example;

[0109] (6) From the bench test data of FE8, V2F, etc., it can be seen that the product of the present invention has excellent lubrication performance and anti-wear performance, which are better than the comparative example.

[0110] (7) From the oxidation stability test data, the present invention has good antioxidant properties and is more excellent than the comparative example.

[0111] In addition, other C 18 ~C 23 When the long carbon chain dibasic acid lithium soap is in the grease composition system described in the present invention, it has an effect equivalent to that of the twenty-one carbon dibasic acid lithium soap in the embodiment, and can significantly improve the mechanical stability and high and low temperature performance of the grease, meeting the lubrication requirements of bearings under high speed and heavy load conditions.

[0112] In summary, from the monitoring and analysis data of the embodiments, the comparative analysis data with the control examples, and the bench test data, it can be seen that the present invention has excellent mechanical stability, extreme pressure and anti-wear performance, and structural stability, and can effectively meet the working requirements of high-speed and heavy-load bearings in harsh environments such as high speed, high load, long operating time, and humidity.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A grease composition, It is characterized in that include: Base oil, thickener and high extreme pressure proton type ionic liquid; Wherein, the base oil includes mineral oil and synthetic oil; The thickener includes 12-hydroxystearate lithium soap and C 18 ~C 23 Long carbon chain dibasic acid lithium soap; In the thickener, the 12-hydroxystearate lithium soap and C 18 ~C 23 The mass ratio of the long carbon chain dibasic acid lithium soap is 1~5:1; The general structural formula of the high extreme pressure proton type ionic liquid is A + B - , where A + is an organic cation, B - is an organic anion, the organic cation is an alkylamine cation, and the organic anion is a borate anion; Based on the total mass of the grease composition, the amount of the high extreme pressure proton type ionic liquid is 2-6wt%; In the base oil, the mass ratio of the mineral oil to the synthetic oil is 25-50:50-75.

2. The grease composition according to claim 1, It is characterized in that The base oil has a viscosity of 90-120 mm at 40°C. 2 / s.

3. The grease composition according to claim 1, It is characterized in that The thickener is composed of 12-hydroxystearic acid, C 18 ~C 23 The long carbon chain dibasic acid is saponified with lithium hydroxide and calcium hydroxide; 12-hydroxystearic acid, C 18 ~C 23 The mass ratio of the total amount of long carbon chain dibasic acid to lithium hydroxide and calcium hydroxide is 10:1~3.

4. The grease composition according to any one of claims 1 to 3, It is characterized in that The grease composition comprises the following components in parts by weight: 60~85 parts of base oil; Thickener 8~16 parts; 2~6 parts of high extreme pressure proton type ionic liquid.

5. The grease composition according to any one of claims 1 to 3, It is characterized in that The grease composition further contains an antioxidant, which includes diphenylamine and N-phenyl-α-naphthylamine in a mass ratio of 1:1-3; The grease composition also contains a rust inhibitor, which includes benzotriazole and sorbitan monooleate in a mass ratio of 1: (1-10).

6. The grease composition according to any one of claims 1 to 3, It is characterized in that The grease composition comprises the following components in parts by weight: 60~85 parts of base oil; Thickener 8~16 parts; 1~3 parts of antioxidant; 2-6 parts of high extreme pressure proton ionic liquid; 1~5 parts of rust inhibitor.

7. A method for preparing the grease composition according to claim 5 or 6, It is characterized in that include: (1) Mix part of the compound base oil with 12-hydroxystearic acid and a long carbon chain dibasic acid, and heat to dissolve the materials; Then, part of the lithium hydroxide solution and the calcium hydroxide solution are added, and the first heat preservation is carried out at 90-100°C; (2) Then, the remaining lithium hydroxide solution and calcium hydroxide solution are added, and the temperature is continued to be raised to 100-110° C. for the second insulation; After the insulation is completed, the temperature is raised to 205~215℃ for the third insulation; (3) adding part of the compound base oil for rapid cooling, and then performing the fourth heat preservation after rapid cooling; then adding the ionic liquid, rust inhibitor and antioxidant in sequence, filtering and homogenizing, and then degassing; (4) After post-processing, the product is canned through the filling pipeline.

8. Use of the grease composition according to any one of claims 1 to 6 or the grease composition prepared by the preparation method according to claim 7 in high-speed and heavy-load bearings.

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