Application of amide salt and fluorocarbon in lubricating grease

Abstract

The invention relates to the field of lubricating grease, and discloses application of amide salt and fluorocarbon in lubricating grease. The lubricating grease comprises base oil, an amide salt thickening agent and a fluorocarbon thickening agent. The lubricating grease provided by the invention has excellent colloid stability, extreme pressure antiwear property and high-temperature performance, and meanwhile, the dosage of the thickening agent is relatively low.

Description

Technical Field

[0001] The invention relates to the field of lubricating grease, and in particular to application of amide salt and fluorocarbon in lubricating grease. Background Art

[0002] Amide greases have excellent high temperature stability, oxidation stability, mechanical stability, radiation resistance and long life, and are often used for lubrication in aviation, aerospace, nuclear power and other fields.

[0003] In 1957, Hotten et al. first proposed the use of the acyl chloride method to prepare amide thickeners in US2098087A. In order to further improve the purity of amides, Hotten et al. adjusted the halogenating agent in US2820012A. Domestic scholars have also conducted a lot of research on amide greases. CN107164059A uses phthalamide salt to thicken polyether base oil, and prepares a high-radiation-resistant, high-vacuum, and high-temperature robot bearing special grease composition with a variety of additives. CN101693851A uses synthetic oil as base oil, polyurea and amide salt as mixed thickeners, and adds antioxidants, extreme pressure agents, and corrosion inhibitors to prepare a synthetic high-temperature grease. However, the grease currently using amide salts still has a lot of room for improvement in high temperature performance, oxidation stability, and colloid stability. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned problems existing in the prior art and to provide an application of amide salt and fluorocarbon in grease. By using amide salt and fluorocarbon in combination, the obtained grease has excellent extreme pressure anti-wear properties, colloid stability and oxidation stability, and at the same time has a low thickener content.

[0005] In order to achieve the above-mentioned object, the first aspect of the present invention provides a grease, which comprises a base oil, an amide salt thickener and a fluorocarbon thickener, wherein the weight ratio of the amide salt thickener to the fluorocarbon thickener is 1.2-12:1.

[0006] A second aspect of the present invention provides a method for preparing the grease, the method comprising: mixing a base oil and a thickener.

[0007] The third aspect of the present invention provides the use of an amide salt thickener and a fluorocarbon thickener in improving the colloidal stability and extreme pressure and anti-wear properties of a grease or reducing the amount of the thickener used.

[0008] By using amide salt and fluorocarbon in combination, the grease has excellent colloid stability, extreme pressure anti-wear and high temperature performance, and the amount of thickener used is also low.

[0009] In a preferred embodiment, the combination of a specific antioxidant can achieve more excellent antioxidant performance (oxidation stability). DETAILED DESCRIPTION

[0010] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0011] In a first aspect, the present invention provides a grease comprising a base oil, an amide salt thickener and a fluorocarbon thickener, wherein the weight ratio of the amide salt thickener to the fluorocarbon thickener is (1.2-12):1 (such as 1.2, 1.3, 1.4, 1.5, 2, 2.5, 2.8, 3, 3.2, 3.5, 4, 4.5, 5 or any value or range between the above values), preferably 1.3-5:1.

[0012] According to the present invention, preferably, based on the total weight of the grease, the total content of the amide salt thickener and the fluorocarbon thickener is 5-25 weight % (for example, it can be 5 weight %, 6 weight %, 7 weight %, 8 weight %, 9 weight %, 10 weight %, 13 weight %, 14 weight %, 15 weight %, 18 weight %, 19 weight %, 20 weight %, 25 weight % or any value or range between the above values), more preferably 8-15 weight %.

[0013] According to the present invention, the amide salt thickener may be a metal salt having an amide structure commonly used in the art. Preferably, the amide salt thickener is selected from at least one of the compounds having a structure shown in the following formula I, wherein R in the formula I is a C12-C18 alkyl group, and M n+ It is one of the metal ions of Group IA, Group IIA and Group IIIA (such as lithium ion, sodium ion, potassium ion, calcium ion, magnesium ion, barium ion, aluminum ion, etc.):

[0014]

[0015] It is understood that "n" in Formula I represents the valence of the metal ion, which can be 1, 2 or 3. More preferably, R in Formula I is a C12-C18 straight chain alkyl group, such as a C12, C14, C16 or C18 straight chain alkyl group.

[0016] More preferably, M in Formula I n+ for Na + or Ca 2+ .

[0017] According to the present invention, the fluorocarbon thickener may be a common fluorine-containing polymer in the art. Preferably, the fluorocarbon thickener is at least one of polytetrafluoroethylene and tetrafluoroethylene hexafluoropropylene copolymer. Preferably, the weight average molecular weight of the fluorocarbon thickener is 1000-1000000. Among them, the weight average molecular weight of the polytetrafluoroethylene is preferably 5000-80000. The weight average molecular weight of the tetrafluoroethylene hexafluoropropylene copolymer is preferably 5000-100000. The molar ratio of the tetrafluoroethylene structural unit to the hexafluoropropylene structural unit in the tetrafluoroethylene hexafluoropropylene copolymer is 0.1-10.

[0018] According to a preferred embodiment of the present invention, the average particle size of the fluorocarbon thickener is 0.1-100 μm, more preferably 1-50 μm, and further preferably 4-10 μm.

[0019] The inventors of the present invention have found that the combination of a specific amide salt thickener and a fluorocarbon thickener will be more conducive to improving the colloidal stability, extreme pressure and anti-wear properties, and high temperature performance of the grease and reducing the amount of the thickener used.

[0020] According to the present invention, preferably, based on the total weight of the grease, the content of the base oil is 75-95 weight % (for example, it can be 70 weight %, 74 weight %, 75 weight %, 77 weight %, 78 weight %, 80 weight %, 81 weight %, 82 weight %, 83 weight %, 85 weight %, 86 weight %, 87 weight %, 90 weight %, 92 weight % or any value or range between the above values), more preferably 78-92 weight %.

[0021] According to the present invention, preferably, the kinematic viscosity of the base oil at 100°C is 2-100 mm 2 / s, more preferably 5-40mm 2 / s. It can be understood that the kinematic viscosity is a measure of the resistance to flow of a fluid under gravity, and refers to the distance that a fluid flows through a capillary in a calibrated kinematic viscometer per second under gravity at a fixed temperature. In the present invention, the kinematic viscosity test method is GB / T30515.

[0022] According to the present invention, the base oil may be a common base oil in the art, preferably, the base oil is a synthetic oil, more preferably at least one of polyalphaolefin oil, ester oil, alkyl naphthalene and fluorinated oil. The preferred base oil of the present invention can be combined with the above thickener to further improve the performance of the resulting grease.

[0023] According to the present invention, the grease may further include at least one of an antioxidant, a rust inhibitor and a filler. According to the present invention, preferably, based on the total weight of the grease, the content of the antioxidant is 0.1-10 wt % (0.1 wt %, 0.9 wt %, 1 wt %, 1.5 wt %, 1.8 wt %, 2 wt %, 3 wt %, 5 wt %, 8 wt %, 10 wt % or any value or range between the above values), more preferably 0.5-2 wt %.

[0024] According to the present invention, the antioxidant may be a substance commonly used in the art that can improve the anti-oxidation property of lubricating grease, such as at least one of a phenolic antioxidant, an amine antioxidant and an organic selenide. The phenolic antioxidant is at least one of 2,6-di-tert-butyl-p-cresol, 2-naphthol, 2,6-di-tert-butyl-α-dimethylamino-p-cresol, 4,4-methylenebis(2,6-di-tert-butylphenol) and 2,6-di-tert-butyl-4-alkoxyphenol. The amine antioxidant is at least one of diphenylamine, 4,4'-diisooctyldiphenylamine, β-naphthylamine, N-phenyl-α-naphthylamine, N-phenyl-β-naphthylamine, N-isopropyl-N'-phenyl-p-phenylenediamine, N-cyclohexyl-N'-phenyl-p-phenylenediamine, N,N'-di-β-naphthyl-p-phenylenediamine and N,N'-di-sec-butyl-p-phenylenediamine. The organic selenide is at least one of dodecyl selenium and diaryl selenium. Preferably, the antioxidant is at least one of 2,6-di-tert-butyl-p-cresol, 2-naphthol, 2,6-di-tert-butyl-α-dimethylamino-p-cresol, 4,4-methylenebis(2,6-di-tert-butylphenol) and 2,6-di-tert-butyl-4-alkoxyphenol, diphenylamine, 4,4'-diisooctyldiphenylamine, β-naphthylamine, N-phenyl-α-naphthylamine, N-phenyl-β-naphthylamine, N-isopropyl-N'-phenyl-p-phenylenediamine, N-cyclohexyl-N'-phenyl-p-phenylenediamine, N,N'-di-β-naphthyl-p-phenylenediamine, N,N'-di-sec-butyl-p-phenylenediamine, dodecyl selenium and diaryl selenium.

[0025] More preferably, the antioxidant is a phenolic antioxidant (especially 2-naphthol and / or 2,6-di-tert-butyl-p-cresol) and an amine antioxidant (especially diphenylamine and / or 4,4'-diisooctyl diphenylamine) in a weight ratio of 0.5-1.5 (such as 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5 or any value or range between the above values). According to a particularly preferred embodiment of the present invention, the antioxidant is 2-naphthol and diphenylamine in a weight ratio of 0.5-1.5. According to another particularly preferred embodiment of the present invention, the antioxidant is 4,4'-diisooctyl diphenylamine and 2,6-di-tert-butyl-p-cresol in a weight ratio of 0.5-1.5.

[0026] According to the present invention, preferably, based on the total weight of the grease, the content of the rust inhibitor is 0.1-10 weight % (for example, it can be 0.1 weight %, 0.9 weight %, 1 weight %, 1.5 weight %, 1.8 weight %, 2 weight %, 3 weight %, 5 weight %, 8 weight %, 10 weight % or any value or range between the above values), more preferably 0.5-2 weight %.

[0027] According to the present invention, the rust inhibitor can be a substance commonly used in the art that can improve the rust prevention function of grease. Preferably, the rust inhibitor is selected from at least one of nitrogen-containing heterocyclic rust inhibitors, more preferably benzotriazole and / or 2-mercaptobenzothiazole.

[0028] According to the present invention, preferably, based on the total weight of the grease, the content of the filler is 0.1-10 weight % (0.1 weight %, 0.5 weight %, 1 weight %, 2 weight %, 2.5 weight %, 3 weight %, 3.5 weight %, 4 weight %, 5 weight %, 6 weight %, 7 weight %, 8 weight %, 9 weight %, 10 weight % or any value or range between the above values), more preferably 2-5 weight %.

[0029] According to the present invention, the filler can be a common substance in the art that can further improve the lubricity, protection and sealing of the grease. Preferably, the filler is a solid powder filler, more preferably at least one of molybdenum disulfide, tungsten disulfide, colloidal graphite, graphite fluoride, calcium fluoride, boron nitride, titanium dioxide, calcium fluoride and calcium carbonate. The average particle size of the filler can be 0.1-100 μm, preferably 1-50 μm, and more preferably 5-20 μm.

[0030] According to the present invention, the grease consists only of the ingredients described above.

[0031] According to the present invention, by mixing preferred types of base oil, thickener, and optional additives in preferred proportions, a lubricating grease with better performance can be obtained.

[0032] In a second aspect, the present invention provides a method for preparing lubricating grease, the method comprising: mixing a base oil with a thickener. The types of the various components are as described above and will not be repeated here.

[0033] According to a preferred embodiment, the method for preparing grease includes: mixing the base oil with the amide salt thickener, heating to 80-120°C, adding the fluorocarbon thickener, heating to 180-220°C and maintaining for 5-20 minutes; adding optional additives (such as antioxidants, rust inhibitors, fillers) and stirring evenly; grinding to obtain the finished product.

[0034] According to another preferred embodiment, the method for preparing grease comprises: mixing part of the base oil with an amide salt thickener, heating to 180-220°C and maintaining for 10-20 minutes, adding optional additives (such as antioxidants, rust inhibitors, fillers) and stirring evenly to obtain an amide salt grease; mixing the remaining part of the base oil with a fluorocarbon thickener to obtain a fluorocarbon grease; mixing the amide salt grease with the fluorocarbon grease; and grinding to obtain a finished product. The weight ratio of the part of the base oil to the remaining part of the base oil is preferably 2-9 (such as 2, 3, 4, 4.5, 4.6, 4.7, 5, 6, 7, 8, 9 or any value or range between the above values).

[0035] Those skilled in the art can obtain the amount of various raw materials used in the preparation method of the second aspect according to the content of the aforementioned base oil, thickener and additives, which will not be described in detail here.

[0036] In a third aspect, the present invention provides the use of an amide salt thickener and a fluorocarbon thickener in improving the colloidal stability and extreme pressure and anti-wear properties of a grease. The inventors of the present invention have found in their research that an amide salt thickener and a fluorocarbon thickener can effectively improve the colloidal stability and extreme pressure and anti-wear properties of a grease in a grease. The use of an amide salt thickener and a fluorocarbon thickener can also save the amount of thickener used and reduce the preparation cost. Therefore, the present invention also provides the use of an amide salt thickener and a fluorocarbon thickener in reducing the content of thickener in a grease.

[0037] Among them, the specific types and proportions of the amide salt thickener and the fluorocarbon thickener are as described above and will not be repeated here.

[0038] The present invention will be described in detail below through examples.

[0039] In the following examples and comparative examples, the sources of the main raw materials used are shown in Table 1.

[0040] Table 1

[0041]

[0042] Example 1

[0043] Raw material components: 73.6 g of PAO 10 base oil; 16 g of fluorine oil; 6.4 g of sodium octadecylamide; 4 g of polytetrafluoroethylene; 0.5 g of 2-naphthol; 0.5 g of diphenylamine; 1 g of benzotriazole; and 3 g of calcium carbonate.

[0044] Add base oil and sodium octadecylamide into the fat-making kettle, stir evenly, heat to 80°C, add polytetrafluoroethylene, heat to 200°C and keep warm for 5 minutes, add 2-naphthol, diphenylamine, benzotriazole and calcium carbonate. Cool to room temperature and grind through a three-roll mill for 2-3 times to make fat.

[0045] Example 2

[0046] Raw material components: 5g of alkyl naphthalene AN238; 10g of calcium tetradecylamide; 5g of tetrafluoroethylene hexafluoropropylene copolymer; 1g of 4,4'-diisooctyl diphenylamine; 1g of 2,6-di-tert-butyl-p-cresol; 2g of 2-mercaptobenzothiazole; and 4g of boron nitride.

[0047] Add base oil and calcium tetradecylamide into the fat making kettle, stir evenly, heat to 90℃, add tetrafluoroethylene hexafluoropropylene copolymer, heat to 200℃ and keep warm for 10min, add 2,6-di-tert-butyl-p-cresol, 4,4'-diisooctyl diphenylamine, 2-mercaptobenzothiazole and boron nitride. Cool to room temperature and grind through a three-roll mill for 2-3 times to make fat.

[0048] Example 3

[0049] Raw material components: 73.6 g of PAO 10 base oil; 16 g of fluorine oil; 6.4 g of sodium octadecylamide; 4 g of polytetrafluoroethylene; 0.5 g of 2-naphthol; 0.5 g of diphenylamine; 1 g of benzotriazole; and 3 g of calcium carbonate.

[0050] Add PAO base oil and sodium octadecylamide into the fat making kettle, stir evenly, heat to 200℃ and keep warm for 5 minutes, add 2-naphthol, diphenylamine, benzotriazole and calcium carbonate, cool to room temperature, and obtain amide fat.

[0051] Add fluorine oil and polytetrafluoroethylene into a grease-making kettle, stir evenly, and make fluorine grease.

[0052] Mix the amide fat and fluoro fat evenly, and grind them through a three-roll mill for 2-3 times to form fat.

[0053] Example 4

[0054] Raw material components: 5g of alkyl naphthalene AN238; 10g of calcium tetradecylamide; 5g of tetrafluoroethylene hexafluoropropylene copolymer; 1g of 4,4'-diisooctyl diphenylamine; 1g of 2,6-di-tert-butyl-p-cresol; 2g of 2-mercaptobenzothiazole; and 4g of boron nitride.

[0055] Add 60g of alkylnaphthalene and calcium tetradecylamide into a fat-making kettle, stir evenly, heat to 200℃ and keep warm for 10min, add 2,6-di-tert-butyl-p-cresol, 4,4'-diisooctyldiphenylamine, 2-mercaptobenzothiazole and boron nitride, cool to room temperature, and obtain amide fat.

[0056] Add 20g of alkyl naphthalene and tetrafluoroethylene hexafluoropropylene copolymer into a grease-making kettle, stir evenly to obtain fluorogrease.

[0057] Mix the amide fat and fluoro fat evenly, and grind them through a three-roll mill for 2-3 times to form fat.

[0058] Example 5

[0059] The grease was prepared according to the method of Example 1, except that the phenolic antioxidant was replaced by diphenylamine.

[0060] Example 6

[0061] A lubricating grease was prepared according to the method of Example 1, except that the amine antioxidant was replaced by 2-naphthol.

[0062] Example 7

[0063] A lubricating grease was prepared according to the method of Example 1, except that the rust inhibitor was replaced by benzothiazole.

[0064] Example 8

[0065] The grease was prepared according to the method of Example 1, except that a polyurea thickener was further introduced, specifically:

[0066] 2.7g oleylamine and 0.3g ethylenediamine were added to 85g base oil and heated to 80°C, then 2.6g 4,4'-diphenylmethane diisocyanate was added and the temperature was raised to 130°C, 5g sodium octadecylamide and 5g polytetrafluoroethylene were added, the temperature was raised to 200°C and kept for 5 minutes, and the same 2-naphthol, diphenylamine, benzotriazole and calcium carbonate as in Example 1 were added. The mixture was cooled to room temperature and ground by a three-roll mill for 2-3 times to form fat.

[0067] Example 9

[0068] Grease was prepared according to the method of Example 1, except that the amount of amide salt thickener used was 12 g, and the amount of fluorocarbon thickener used was 9 g.

[0069] Comparative Example 1

[0070] Raw material components: PAO 10 base oil 89.6g; sodium octadecylamide 10.4g; 2-naphthol 0.5g; diphenylamine 0.5g; benzotriazole 1g; calcium carbonate 3g.

[0071] Add base oil and sodium octadecylamide into the fat-making kettle, stir evenly, heat to 200℃ and keep warm for 10 minutes, add 2-naphthol, diphenylamine, benzotriazole and calcium carbonate. Cool to room temperature and grind through a three-roll mill for 2-3 times to make fat.

[0072] Comparative Example 2

[0073] Raw material components: 72g fluorine oil; 28g polytetrafluoroethylene; 0.5g 2-naphthol; 0.5g diphenylamine; 1g benzotriazole; 3g calcium carbonate.

[0074] Add fluorinated oil and polytetrafluoroethylene into the fat-making kettle, heat to 100℃ and keep warm for 5 minutes, add 2-naphthol, diphenylamine, benzotriazole and calcium carbonate, cool to room temperature, stir evenly, and grind through a three-roll mill for 2-3 times to make fat.

[0075] Comparative Example 3

[0076] Grease was prepared according to the method of Example 1, except that polyurea was used instead of amide salt thickener. The specific preparation process was as follows:

[0077] 5.39g of oleylamine and 0.6g of ethylenediamine were added to 84g of base oil and heated to 80°C, then 5.2g of 4,4'-diphenylmethane diisocyanate was added and the temperature was raised to 130°C, 6g of polytetrafluoroethylene was added, the temperature was raised to 200°C and kept for 5 minutes, and the same 2-naphthol, diphenylamine, benzotriazole and calcium carbonate as in Example 1 were added. The mixture was cooled to room temperature and ground by a three-roll mill for 2-3 times to form fat.

[0078] Comparative Example 4

[0079] Grease was prepared according to the method of Example 1, except that polyurea was used instead of fluorocarbon thickener. The specific preparation process was as follows:

[0080] 5.39g of oleylamine and 0.6g of ethylenediamine were added to 82g of base oil and heated to 80°C, then 5.2g of 4,4'-diphenylmethane diisocyanate was added and the temperature was raised to 130°C, 8g of sodium octadecylamide was added, the temperature was raised to 200°C and kept for 5 minutes, and the same 2-naphthol, diphenylamine, benzotriazole and calcium carbonate as in Example 1 were added. The mixture was cooled to room temperature and ground by a three-roll mill for 2-3 times to form fat.

[0081] Comparative Example 5

[0082] The grease was prepared according to the method of Example 1, except that the amounts of the amide salt thickener and the fluorocarbon thickener used were 2.5 g and 11.5 g, respectively.

[0083] Comparative Example 6

[0084] The grease was prepared according to the method of Example 1, except that the amounts of the amide salt thickener and the fluorocarbon thickener used were 7 g and 7 g, respectively.

[0085] Test Example 1

[0086] The various properties of the greases prepared in the examples and comparative examples were evaluated according to the following methods. The results are shown in Table 2-3:

[0087] The dropping point is determined using the GB / T 3498 method. The higher the measured value, the better the high temperature performance.

[0088] The cone penetration is determined using the GB / T 269 method. The smaller the value, the thicker the fat.

[0089] The oil separation performance of steel mesh is determined by NB / SH / T 0324 method. The smaller the value, the less oil separation.

[0090] The extreme pressure performance is determined using the SH / T 0202 method;

[0091] The anti-wear performance (wear spot diameter) was determined using the SH / T 0204 method. The smaller the value, the better the anti-wear performance.

[0092] The SH / T 0325 method is used to determine the oxidation stability. The smaller the value, the better the antioxidant performance.

[0093] GB / T 7326 method was used to determine the corrosion of copper strips.

[0094] Table 2

[0095]

[0096] Table 3

[0097]

[0098]

[0099] From the above results, it can be seen that the grease of the present invention has excellent extreme pressure and anti-wear properties; the steel mesh oil separation parameter is relatively low, indicating that the grease of the present invention has excellent colloid stability. Moreover, the amount of thickener used in the grease of the present invention is greatly reduced.

[0100] In particular, by comparing the examples with comparative examples 1-5, it can be seen that the purpose of the present invention can only be achieved by combining the amide salt thickener and the fluorocarbon thickener in a specific ratio. By comparing Example 1 with Examples 5-7, it can be seen that the present invention can further improve the performance of the grease by combining the antioxidant and rust inhibitor within the preferred range. By comparing Example 1 with Example 8, it can be seen that the present invention has better performance without the use of a polyurea thickener. By comparing Example 1 with Example 9, it can be seen that the specific thickener combination of the present invention can reduce the total amount of thickener used.

[0101] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A lubricating grease, characterized in that: The lubricating grease comprises a base oil, an amide salt thickener and a fluorocarbon thickener, wherein the weight ratio of the amide salt thickener to the fluorocarbon thickener is 1.2-12:

1.

2. The grease according to claim 1, wherein: The weight ratio of the amide salt thickener to the fluorocarbon thickener is 1.3-5:1; and / or, based on the total weight of the grease, the total content of the amide salt thickener and the fluorocarbon thickener is 5-25% by weight, preferably 8-15% by weight; And / or, the amide salt thickener is selected from at least one of the compounds having the structure shown in the following formula I, wherein R in the formula I is a C12-C18 alkyl group, M n+ is one of the Group IA metal ion, the Group IIA metal ion and the Group IIIA metal ion: And / or, the fluorocarbon thickener is at least one of polytetrafluoroethylene and tetrafluoroethylene hexafluoropropylene copolymer; And / or, the average particle size of the fluorocarbon thickener is 0.1-100 μm, preferably 1-50 μm.

3. The grease according to claim 1 or 2, wherein: Based on the total weight of the grease, the content of the base oil is 75-95% by weight, preferably 78-92% by weight; And / or, the kinematic viscosity of the base oil at 100°C is 2-100 mm 2 / s, preferably 5-40mm 2 / s; And / or, the base oil is a synthetic oil, preferably at least one of poly-alpha-olefin oil, ester oil, alkyl naphthalene and fluorine oil.

4. The grease according to claim 1, wherein The grease also includes at least one of an antioxidant, a rust inhibitor and a filler.

5. The grease according to claim 4, wherein: Based on the total weight of the grease, the content of the antioxidant is 0.1-10% by weight, preferably 0.5-2% by weight; And / or, the antioxidant is at least one of a phenolic antioxidant, an amine antioxidant and an organic selenide, preferably at least one of 2,6-di-tert-butyl-p-cresol, 2-naphthol, 2,6-di-tert-butyl-α-dimethylamino-p-cresol, 4,4-methylenebis(2,6-di-tert-butylphenol) and 2,6-di-tert-butyl-4-alkoxyphenol, diphenylamine, 4,4'-diisooctyldiphenylamine, β-naphthylamine, N-phenyl-α-naphthylamine, N-phenyl-β-naphthylamine, N-isopropyl-N'-phenyl-p-phenylenediamine, N-cyclohexyl-N'-phenyl-p-phenylenediamine, N,N'-di-β-naphthyl-p-phenylenediamine, N,N'-di-sec-butyl-p-phenylenediamine, dodecylselenium and diarylselenonium.

6. The grease according to claim 1 or 5, wherein: The antioxidants are phenolic antioxidants and amine antioxidants in a weight ratio of 0.5-1.

5.

7. The grease according to claim 4, wherein: Based on the total weight of the grease, the content of the rust inhibitor is 0.1-10% by weight, preferably 0.5-2% by weight; And / or, the rust inhibitor is selected from at least one of nitrogen-containing heterocyclic rust inhibitors, preferably benzotriazole and / or 2-mercaptobenzothiazole.

8. The grease according to claim 4, wherein: Based on the total weight of the grease, the content of the filler is 0.1-10% by weight, preferably 2-5% by weight; And / or, the filler is a solid powder filler, preferably at least one of molybdenum disulfide, tungsten disulfide, colloidal graphite, graphite fluoride, calcium fluoride, boron nitride, titanium dioxide, calcium fluoride and calcium carbonate.

9. A method for preparing the grease according to any one of claims 1 to 8, characterized in that: The method includes mixing a base oil and a thickener.

10. The use of amide salt thickeners and fluorocarbon thickeners to improve the colloidal stability and extreme pressure and anti-wear properties of grease or to reduce the amount of thickener used.

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