Use of amide salts and fluorocarbons in greases

Abstract

The application relates to the field of lubricating grease, and discloses application of an 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 has excellent colloid stability, extreme pressure and wear resistance and high-temperature performance, and the amount of the thickening agent is relatively low.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of lubricating grease, in particular to an application of amide salt and fluorocarbon in lubricating grease. BACKGROUND

[0002] Amide lubricating grease has excellent high-temperature stability, oxidation stability, mechanical stability, radiation resistance and long service life, and is often used for lubrication in the fields of aviation, aerospace and nuclear power.

[0003] In 1957, Hotten et al. first proposed to prepare amide thickener by using acid chloride method in US2098087A. In order to further improve the purity of amide, Hotten et al. adjusted the halogenated agent in US2820012A. Domestic scholars have also conducted a lot of research on amide lubricating grease. CN107164059A uses phthalic acid diamide salt to thicken polyether base oil, and prepares a high-radiation high-vacuum high-temperature robot bearing special grease composition by cooperating with various additives. CN101693851A uses synthetic oil as base oil, polyurea and amide salt as mixed thickener, and adds antioxidants, extreme pressure agents and corrosion inhibitors to prepare a synthetic high-temperature lubricating grease. However, the lubricating grease using amide salt still has a large space for improvement in high-temperature performance, oxidation stability and colloid stability. SUMMARY

[0004] The purpose of the present application is to overcome the above-mentioned problems existing in the prior art, and to provide an application of amide salt and fluorocarbon in lubricating grease. By cooperating with amide salt and fluorocarbon, the obtained lubricating grease has excellent extreme pressure and wear resistance, colloid stability and oxidation stability, and the content of thickener is relatively low.

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

[0006] The second aspect of the present application provides a method for preparing the lubricating grease, which comprises mixing base oil and thickener.

[0007] The third aspect of the present application provides an application of amide salt thickener and fluorocarbon thickener in improving the colloid stability and extreme pressure and wear resistance of lubricating grease or reducing the amount of thickener.

[0008] By cooperating with amide salt and fluorocarbon, the lubricating grease has excellent colloid stability, extreme pressure and wear resistance and high-temperature performance, and the amount of thickener is relatively low.

[0009] In the preferred embodiment, the cooperation of specific antioxidants can obtain more excellent oxidation resistance (oxidation stability). DETAILED DESCRIPTION

[0010] The endpoints of the ranges and any values disclosed herein are not limited to the precise values recited as the exact dimensions are not considered critical for the purposes of the application. The ranges should be interpreted as being inclusive of the recited values and the ranges should be interpreted as being inclusive of the recited endpoints. For values which are less than one, combinations of the upper and lower limits of the range can be made to achieve the value which is less than one. For values which are greater than one, combinations of the upper and lower limits of the range can be made to achieve the value which is greater than one.

[0011] In a first aspect, the present application provides a grease comprising a base oil, an amide salt thickener and a fluorocarbon thickener, wherein the weight ratio of the amide salt thickener and 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 aforementioned values), preferably 1.3-5: 1.

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

[0013] According to the present application, the amide salt thickener can 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 the structure shown in Formula I, wherein R in Formula I is a C12-C18 alkyl group, M n+ is one of Group IA metal ions, Group IIA metal ions and Group IIIA metal ions (such as lithium ion, sodium ion, potassium ion, calcium ion, magnesium ion, barium ion, aluminum ion, etc.):

[0014]

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

[0016] More preferably, M n+ is Na + or Ca 2+ .

[0017] According to the present application, the fluorocarbon thickening agent can be a fluorine-containing high molecular substance commonly used in the art, preferably, the fluorocarbon thickening agent is at least one of polytetrafluoroethylene and tetrafluoroethylene hexafluoropropylene copolymer. Preferably, the weight average molecular weight of the fluorocarbon thickening agent 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 tetrafluoroethylene structural units to hexafluoropropylene structural units in the tetrafluoroethylene hexafluoropropylene copolymer is 0.1-10.

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

[0019] The inventors of the present application have found that the use of a specific amide salt thickening agent and a fluorocarbon thickening agent will be more beneficial to improve the colloidal stability, extreme pressure and wear resistance, high temperature performance of the grease and reduce the amount of thickening agent.

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

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

[0022] According to the present application, the base oil can be a base oil commonly used in the art, preferably, the base oil is a synthetic oil, and more preferably at least one of polyalphaolefin oil, ester oil, alkyl naphthalene and fluorine oil. The preferred base oil of the present application can further improve the performance of the obtained grease when combined with the above-mentioned thickening agent.

[0023] According to the present application, the grease can further include at least one of an antioxidant, an antirust agent, and a filler. According to the present application, the antioxidant is preferably contained in an amount of 0.1 to 10% by weight (0.1%, 0.9%, 1%, 1.5%, 1.8%, 2%, 3%, 5%, 8%, 10% or any value or range between the aforementioned values) based on the total weight of the grease, more preferably 0.5 to 2% by weight.

[0024] According to the present application, the antioxidant can be at least one of substances commonly used in the art to improve the oxidation resistance of a grease, such as a phenolic antioxidant, an amine antioxidant, and an organic selenium compound. 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-alkyloxyphenol. The amine antioxidant is at least one of diphenylamine, 4,4'-diisooctyl-diphenylamine, 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 selenium compound 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-alkyloxyphenol, diphenylamine, 4,4'-diisooctyl-diphenylamine, 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 (particularly 2-naphthol and / or 2,6-di-tert-butyl-p-cresol) and an amine antioxidant (particularly diphenylamine and / or 4,4'-diisooctyl-diphenylamine) in a weight ratio of 0.5 to 1.5 (e.g., 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 aforementioned values), according to a particularly preferred embodiment of the present application, the antioxidant is 2-naphthol and diphenylamine in a weight ratio of 0.5 to 1.5. According to another particularly preferred embodiment of the present application, the antioxidant is 4,4'-diisooctyl-diphenylamine and 2,6-di-tert-butyl-p-cresol in a weight ratio of 0.5 to 1.5.

[0026] According to the present application, preferably, the content of the rust-preventive agent is 0.1-10 wt% (for example, it can be 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) based on the total weight of the grease, more preferably 0.5-2 wt%.

[0027] According to the present application, the rust-preventive agent can be a substance commonly used in the art which can improve the rust-preventive function of the grease, preferably, the rust-preventive agent is at least one selected from nitrogen-containing heterocyclic rust-preventive agents, more preferably benzotriazole and / or 2-mercaptobenzothiazole.

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

[0029] According to the present application, the filler can be a substance commonly used in the art which can further improve the lubricity, protectiveness and sealability of the grease, preferably, the filler is a solid powder filler, more preferably at least one selected from molybdenum disulfide, tungsten disulfide, colloidal graphite, fluorinated graphite, 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, more preferably 5-20 μm.

[0030] According to the present application, the grease is composed of only the components as described above.

[0031] According to the present application, by mixing the base oil, the thickening agent and the optional additive in the preferred proportions and of the preferred kinds, a grease with more excellent performance can be obtained.

[0032] In a second aspect, the present application provides a method for preparing a grease, which comprises mixing a base oil with a thickening agent. The kinds of the components are as described above and will not be repeated here.

[0033] According to a preferred embodiment, the method for preparing a grease comprises mixing a base oil with an amide salt thickening agent, adding a fluorocarbon thickening agent at a temperature of 80-120°C, keeping the temperature at 180-220°C for 5-20 min, adding optional additives (such as an antioxidant, a rust-preventive agent, a filler) and stirring until uniform, and grinding to obtain the finished product.

[0034] According to another preferred embodiment, the method for preparing the grease comprises: mixing part of the base oil with the amide salt thickener, heating to 180-220°C for 10-20 min, adding optional additives (such as antioxidant, anti-rust agent, filler) and stirring to obtain the amide salt grease; mixing the remaining part of the base oil with the fluorocarbon thickener to obtain the fluorocarbon grease; mixing the amide salt grease with the fluorocarbon grease; and grinding to obtain the 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] The skilled in the art can obtain the amount of each raw material in the preparation method of the second aspect according to the content of the aforementioned base oil, thickener and additive, which is not described here.

[0036] In a third aspect, the application provides the use of the amide salt thickener and the fluorocarbon thickener in improving the colloidal stability and extreme pressure and wear resistance of the grease. The inventors of the application found in the research that the amide salt thickener and the fluorocarbon thickener can effectively improve the colloidal stability and extreme pressure and wear resistance of the grease in the grease. The use of the amide salt thickener and the fluorocarbon thickener can also save the amount of the thickener and reduce the preparation cost. Therefore, the application also provides the use of the amide salt thickener and the fluorocarbon thickener in reducing the content of the thickener in the grease.

[0037] The specific types and ratios of the amide salt thickener and the fluorocarbon thickener are as described above and will not be described here.

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

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

[0040] Table 1

[0041]

[0042] Example 1

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

[0044] The base oil, sodium octadecyl amide was added to the grease preparation kettle, stirred uniformly, heated to 80°C, polytetrafluoroethylene was added, heated to 200°C and kept for 5 min, 2-naphthol, diphenylamine, benzotriazole, calcium carbonate were added. Cool to room temperature, grind 2-3 times by three-roll mill to form grease.

[0045] Example 2

[0046] Raw material components: alkyl naphthalene AN238 85 g; calcium tetradecylamide 10 g; tetrafluoroethylene hexafluoropropylene copolymer 5 g; 4,4'-diisooctyl diphenylamine 1 g; 2,6-di-tert-butyl-p-cresol 1 g; 2-mercaptobenzothiazole 2 g; boron nitride 4 g.

[0047] The base oil, calcium tetradecylamide were added to the fat-making kettle, stirred uniformly, heated to 90°C, and then tetrafluoroethylene hexafluoropropylene copolymer was added, heated to 200°C and kept for 10 min, and then 2,6-di-tert-butyl-p-cresol, 4,4'-diisooctyl diphenylamine, 2-mercaptobenzothiazole, and boron nitride were added. After cooling to room temperature, the fat was made by grinding 2-3 times with a three-roll mill.

[0048] Example 3

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

[0050] The PAO base oil and sodium octadecylamide were added to the fat-making kettle, stirred uniformly, heated to 200°C and kept for 5 min, and then 2-naphthol, diphenylamine, benzotriazole, and calcium carbonate were added. After cooling to room temperature, the amide fat was prepared.

[0051] The fluorine oil and polytetrafluoroethylene were added to the fat-making kettle, stirred uniformly, and the fluorine fat was prepared.

[0052] The amide fat and fluorine fat were mixed uniformly, and the fat was made by grinding 2-3 times with a three-roll mill.

[0053] Example 4

[0054] Raw material components: alkyl naphthalene AN238 85 g; calcium tetradecylamide 10 g; tetrafluoroethylene hexafluoropropylene copolymer 5 g; 4,4'-diisooctyl diphenylamine 1 g; 2,6-di-tert-butyl-p-cresol 1 g; 2-mercaptobenzothiazole 2 g; boron nitride 4 g.

[0055] The alkyl naphthalene 60 g and calcium tetradecylamide were added to the fat-making kettle, stirred uniformly, heated to 200°C and kept for 10 min, and then 2,6-di-tert-butyl-p-cresol, 4,4'-diisooctyl diphenylamine, 2-mercaptobenzothiazole, and boron nitride were added. After cooling to room temperature, the amide fat was prepared.

[0056] The alkyl naphthalene 20 g and tetrafluoroethylene hexafluoropropylene copolymer were added to the fat-making kettle, stirred uniformly, and the fluorine fat was prepared.

[0057] The amide fat and fluorine fat were mixed uniformly, and the fat was made by grinding 2-3 times with a three-roll mill.

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

[0062] Example 7

[0063] The 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] 2.7 g of oleylamine and 0.3 g of ethylenediamine were added to 85 g of base oil and heated to 80°C, then 2.6 g of 4,4'-diphenylmethane diisocyanate was added and the temperature was raised to 130°C, 5 g of sodium octadecylamide and 5 g of polytetrafluoroethylene were added, the temperature was raised to 200°C and kept for 5 min, and the same 2-naphthol, diphenylamine, benzotriazole, calcium carbonate as in Example 1 were added. After cooling to room temperature, the grease was prepared by grinding 2-3 times with a three-roll mill.

[0067] Example 9

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

[0069] Comparative Example 1

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

[0071] The base oil and sodium octadecylamide were added to the grease kettle, stirred uniformly, heated to 200°C and kept for 10 min, and 2-naphthol, diphenylamine, benzotriazole, calcium carbonate were added. After cooling to room temperature, the grease was prepared by grinding 2-3 times with a three-roll mill.

[0072] Comparative Example 2

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

[0074] The fluorine oil and polytetrafluoroethylene were added into the grease preparation kettle, heated to 100°C and kept for 5 min, 2-naphthol, diphenylamine, benzotriazole, calcium carbonate were added. After cooling to room temperature, stirring was uniform, and 2-3 times of grinding by three-roll mill was carried out to form grease.

[0075] Comparative Example 3

[0076] The grease was prepared according to the method of Example 1, except that the polyurea replaced the amide salt thickener, and the specific preparation process was as follows:

[0077] 5.39 g of oleylamine and 0.6 g of ethylenediamine were added into 84 g of base oil and heated to 80°C, then 5.2 g of 4,4'-diphenylmethane diisocyanate was added and reacted to 130°C, 6 g of polytetrafluoroethylene was added, heated to 200°C and kept for 5 min, and 2-naphthol, diphenylamine, benzotriazole, calcium carbonate were added. After cooling to room temperature, stirring was uniform, and 2-3 times of grinding by three-roll mill was carried out to form grease.

[0078] Comparative Example 4

[0079] The grease was prepared according to the method of Example 1, except that the polyurea replaced the fluorocarbon thickener, and the specific preparation process was as follows:

[0080] 5.39 g of oleylamine and 0.6 g of ethylenediamine were added into 82 g of base oil and heated to 80°C, then 5.2 g of 4,4'-diphenylmethane diisocyanate was added and reacted to 130°C, 8 g of sodium octadecylamide was added, heated to 200°C and kept for 5 min, and 2-naphthol, diphenylamine, benzotriazole, calcium carbonate were added. After cooling to room temperature, stirring was uniform, and 2-3 times of grinding by three-roll mill was carried out to form grease.

[0081] Comparative Example 5

[0082] The grease was prepared according to the method of Example 1, except that the amount of amide salt thickener and fluorocarbon thickener was 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 amount of amide salt thickener and fluorocarbon thickener was 7 g and 7 g, respectively.

[0085] Test Example 1

[0086] The properties of the greases prepared in Examples and Comparative Examples were evaluated according to the following method, and the results are shown in Tables 2-3:

[0087] The drop point was measured by GB / T 3498 method, and the higher the measured value, the better the high temperature performance;

[0088] The cone penetration is determined by the method of GB / T 269, and the smaller the value, the thicker the grease;

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

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

[0091] The anti-wear performance (wear scar diameter) is determined by the method of SH / T 0204, and the smaller the value, the better the anti-wear performance;

[0092] The oxidation stability is determined by the method of SH / T 0325, and the smaller the value, the better the anti-oxidation performance;

[0093] The copper sheet corrosion is determined by the method of GB / T 7326.

[0094] Table 2

[0095]

[0096] Table 3

[0097]

[0098]

[0099] It can be seen from the above results that the lubricating grease of the present application has excellent extreme pressure and anti-wear performance; the steel screen oil separation parameter is low, indicating that the lubricating grease of the present application has excellent colloidal stability. Moreover, the amount of thickener in the lubricating grease of the present application is greatly reduced.

[0100] In particular, it can be seen from the comparative example and examples 1-5 that only the amide salt thickener and the fluorocarbon thickener are matched in a specific ratio to achieve the purpose of the present application. It can be seen from the comparison of example 1 and examples 5-7 that the use of antioxidants and rust inhibitors in the preferred range in the present application can further improve the performance of the lubricating grease. It can be seen from the comparison of example 1 and example 8 that the performance of the present application is better without using polyurea thickener. It can be seen from the comparison of example 1 and example 9 that the specific thickener matching of the present application can reduce the total amount of thickener.

[0101] The preferred embodiments of the present application are described in detail above, but the present application is not limited thereto. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, including the combination of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as disclosed by the present application and fall within the protection scope of the present application.

Claims

1. A lubricating grease characterized in that, The lubricating grease comprises base oil, thickener and antioxidant, the thickener is amide salt thickener and fluorocarbon thickener, wherein the weight ratio of the amide salt thickener and the fluorocarbon thickener is 1.4-5:1; The antioxidant is phenolic antioxidant and amine antioxidant with a weight ratio of 0.5-1.5; The phenolic antioxidant is at least one of 2,6-di-tert-butyl-p-cresol, 2-naphthol, 2,6-di-tert-butyl-alpha-dimethylamino-p-cresol, 4,4-methylenebis(2,6-di-tert-butylphenol) and 2,6-di-tert-butyl-4-alkoxylphenol; The amine antioxidant is at least one of diphenylamine, 4,4'-diisooctyl diphenylamine, beta-naphthylamine, N-phenyl-alpha-naphthylamine, N-phenyl-beta-naphthylamine, N-isopropyl-N'-phenyl-p-phenylenediamine, N-cyclohexyl-N'-phenyl-p-phenylenediamine, N,N'-di-beta-naphthyl-p-phenylenediamine and N,N'-di-sec-butyl-p-phenylenediamine.

2. The grease of claim 1, wherein, The total content of the amide salt thickener and the fluorocarbon thickener is 5-25% by weight based on the total weight of the lubricating grease; and / or the amine salt viscosifier is selected from at least one of the compounds having the structure of Formula I below, where R is a C12-C18 alkyl group, M n+ is one of a Group IA metal ion, a Group IIA metal ion, and a Group IIIA metal ion: Formula I 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.

3. The grease according to claim 1 or 2, wherein The total content of the amide salt thickener and the fluorocarbon thickener is 8-15% by weight based on the total weight of the lubricating grease; And / or, the average particle size of the fluorocarbon thickener is 1-50 μm.

4. The grease of claim 1, wherein, The content of the base oil is 75-95% by weight based on the total weight of the lubricating grease; and / or the base oil has a kinematic viscosity at 100°C of 2-100 mm 2 / s; And / or, the base oil is synthetic oil.

5. The grease of claim 1, wherein, The content of the base oil is 78-92% by weight based on the total weight of the lubricating grease; and / or the base oil has a kinematic viscosity at 100°C of 5-40 mm 2 / s; And / or, the base oil is at least one of poly-alpha olefin oil, ester oil, alkyl naphthalene and fluorine oil.

6. The grease of claim 1, wherein, The lubricating grease further comprises at least one of rust preventive and filler.

7. The grease of claim 1, wherein, The content of the antioxidant is 0.1-10% by weight based on the total weight of the lubricating grease.

8. The grease of claim 7, wherein, The content of the antioxidant is 0.5-2% by weight based on the total weight of the lubricating grease.

9. The grease of claim 6, wherein, The content of the rust preventive is 0.1-10% by weight based on the total weight of the lubricating grease; And / or, the rust preventive is at least one of nitrogen-containing heterocyclic rust preventives.

10. The grease of claim 9, wherein, The content of the rust preventive is 0.5-2% by weight based on the total weight of the lubricating grease; And / or, the rust preventive is benzotriazole and / or 2-mercaptobenzothiazole.

11. The grease of claim 6, wherein, The content of the filler is 0.1-10% by weight based on the total weight of the lubricating grease; And / or, the filler is solid powder filler.

12. The grease of claim 11, wherein, The content of the filler is 2-5% by weight based on the total weight of the lubricating grease; And / or, the filler is at least one of molybdenum disulfide, tungsten disulfide, colloidal graphite, fluorinated graphite, boron nitride, titanium dioxide, calcium fluoride and calcium carbonate.

13. A process for preparing the grease according to any one of claims 1 to 12, characterized in that The method comprises mixing base oil with amide salt thickening agent, heating to 80-120 DEG C, adding fluorocarbon thickening agent, heating to 180-220 DEG C for 5-20 min, adding antioxidant and optional other additives and stirring uniformly, and grinding to obtain finished product, the other additives being at least one of rust inhibitor and filler.

14. Use of amide salt thickening agent and fluorocarbon thickening agent in improving the colloidal stability and extreme pressure and wear resistance of grease or reducing the amount of thickening agent.

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