Extreme pressure anti-wear lubricating grease composition and preparation method thereof

Abstract

The invention relates to the field of lubricating grease production, and particularly discloses an extreme pressure anti-wear lubricating grease composition and a preparation method thereof.The lubricating grease composition comprises, by weight, 70-95 parts of base oil, 0.5-2 parts of a thickening agent, 1-3 parts of an antioxidant and 3-6 parts of an anti-wear agent, the anti-wear agent comprises a phosphate extreme pressure anti-wear agent and sulfurized isobutylene, the mass ratio of the phosphate extreme pressure anti-wear agent to the sulfurized isobutylene is (1-2): 1, and the wear resistance of the lubricating grease composition is improved through the cooperative use of the phosphate extreme pressure anti-wear agent and the sulfurized isobutylene; in addition, the preparation method has the advantage of being easy to operate.

Description

Technical Field

[0001] The present application relates to the field of grease production, and more specifically, to an extreme pressure anti-wear grease composition and a preparation method thereof. Background Art

[0002] Grease is a thick, oily semisolid, used in the friction parts of machinery to lubricate and seal, and also used on metal surfaces to fill gaps and prevent rust. Grease is mainly made of mineral oil (or synthetic lubricant) and thickener.

[0003] At present, grease is often used in various parts of vehicles. The operating environment of each vehicle part is different. The grease in some parts needs to face high temperature or high pressure, which also puts higher requirements on the wear resistance of the grease. Ordinary grease often cannot be used in the above operating environment. Summary of the invention

[0004] In order to make the grease composition suitable for high temperature and high pressure environment, the present application provides an extreme pressure anti-wear grease composition and a preparation method thereof

[0005] In a first aspect, the present application provides an extreme pressure anti-wear grease composition, which adopts the following technical solution:

[0006] An extreme pressure anti-wear grease composition comprises the following components in parts by weight: 70-95 parts of base oil, 0.5-2 parts of thickener, 1-3 parts of antioxidant and 3-6 parts of anti-wear agent, wherein the anti-wear agent comprises a phosphate ester extreme pressure anti-wear agent and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is (1-2):1.

[0007] By adopting the above technical scheme, isobutylene sulfide can combine with the friction surface to form a lubricating film on the friction surface; as the pressure increases and the friction time prolongs, the isobutylene sulfide decomposes, and the sulfur reacts with the friction surface to form a protective film of iron sulfide and iron sulfate, thereby further enhancing the wear resistance of the friction surface. When the pressure further increases, the temperature of the friction surface rises rapidly, so that the phosphate ester extreme pressure anti-wear agent reacts with the friction surface to form a protective film, thereby making the friction surface less prone to wear, that is, improving the wear resistance of the friction surface, and achieving the purpose of making the grease composition suitable for high temperature and high pressure environments.

[0008] Preferably, the grease composition comprises the following components in parts by weight: 80-90 parts of base oil, 1-1.7 parts of thickener, 1.5-2 parts of antioxidant and 4-4.5 parts of anti-wear agent, wherein the anti-wear agent comprises a phosphate ester extreme pressure anti-wear agent and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to sulfided isobutylene is 1.5:1.

[0009] Preferably, the grease composition further comprises 1-2 parts by mass of modified silica.

[0010] By adopting the above technical solution, the modified silica is combined with the thickener, so that the modified silica can adsorb impurities, thereby making it difficult for the impurities to disperse into the grease composition and affect the service life of the grease.

[0011] Preferably, the modified silica is prepared by modifying silica with a silane coupling agent.

[0012] By adopting the above technical scheme, the silane coupling agent modified silica is combined with the thickener, which enables the modified silica to combine with the oily segment of the thickener, so that the modified silica is not easy to gather to the friction surface, so that after the modified silica absorbs impurities, the impurities are not easy to gather to the friction surface, and then the friction surface is not easy to be worn.

[0013] Preferably, the anti-wear agent further comprises 2-4 parts by mass of potassium feldspar powder.

[0014] By adopting the above technical solution, potassium feldspar has a stable crystal structure, and the aluminum, silicon, potassium and other elements inside it form an orderly three-dimensional network. When potassium feldspar is added to the grease, the stable structure of potassium feldspar enables the potassium feldspar powder located on the friction surface to convert the sliding friction between the friction surfaces into rolling friction, so that the friction surface is not easily worn; in addition, the crystal structure of potassium feldspar can play a role in supporting and dispersing pressure, reducing the stress concentration inside the grease, thereby helping to maintain the stability of the grease; potassium feldspar can replace part of the thickener, thereby reducing the use of the thickener on the one hand, and on the other hand, the grease adsorbed by potassium feldspar can form a thicker lubricating film on the friction surface, so that the grease is not easy to lose under high temperature and high pressure, thereby effectively reducing the wear of the friction surface; the aluminum oxide in potassium feldspar can move in the direction close to the friction surface, thereby repairing the worn position of the friction surface, so as to further improve the wear resistance of the friction surface.

[0015] Preferably, the antioxidant is a shielded phenolic antioxidant.

[0016] Preferably, the antioxidant is a shielded phenolic antioxidant and a diphenylamine antioxidant, and the mass ratio of the shielded phenolic antioxidant to the diphenylamine antioxidant is 1:(1-2).

[0017] By adopting the above technical solution, the larger specific surface area and special surface structure of potassium feldspar enable potassium feldspar to adsorb diphenylamine antioxidant, so that the antioxidant can be more evenly distributed in the grease system; the diphenylamine antioxidant forms diphenylamine free radicals after oxidation, and the active groups on the surface of potassium feldspar can combine with the diphenylamine free radicals so that the diphenylamine free radicals are not easy to react with the base oil in the grease, thereby improving the oxidation stability of the grease.

[0018] In a second aspect, the present application also provides a method for preparing an extreme pressure anti-wear grease composition, using the following technical solution:

[0019] A method for preparing an extreme pressure anti-wear grease composition comprises the following steps:

[0020] S1. Weigh each substance according to mass;

[0021] S2, mixing the thickener and the base oil to obtain a mixture;

[0022] S3, cooling the mixture, mixing it with other substances, and grinding it on a three-roll mill to disperse the soap fibers to obtain a product.

[0023] In summary, this application has the following beneficial effects:

[0024] 1. Isobutylene sulfide can combine with the friction surface to form a lubricating film on the friction surface; as the pressure increases and the friction time prolongs, the isobutylene sulfide decomposes, and the sulfur reacts with the friction surface to form a protective film of iron sulfide and iron sulfate, thereby further enhancing the wear resistance of the friction surface. When the pressure further increases, the temperature of the friction surface rises rapidly, so that the phosphate ester extreme pressure anti-wear agent reacts with the friction surface to form a protective film, thereby making the friction surface less prone to wear, that is, improving the wear resistance of the friction surface, and achieving the purpose of making the grease composition suitable for high temperature and high pressure environments.

[0025] 2. The method of the present application has the advantage of being simple to operate. DETAILED DESCRIPTION

[0026] The present application is further described in detail below in conjunction with the embodiments and preparation examples. The raw materials used in the preparation examples and embodiments of the present application are all commercially available. Among them, silane coupling agent KH570 was purchased from Shandong Huachen New Materials Co., Ltd.; white carbon black was purchased from a380 white carbon black of Shandong Kasong New Materials Co., Ltd.; butyl octylated diphenylamine was purchased from Wuhan Smac Biotechnology Co., Ltd.; 2,6-di-tert-butyl-4-methylphenol was purchased from Jinan Huijinchuan Chemical Co., Ltd.; the particle size of potassium feldspar powder was 325 mesh.

[0027] Preparation example of modified silica

[0028] Take 1 kg of deionized water and 9 kg of anhydrous ethanol and mix them evenly to obtain an anhydrous ethanol solution, add acetic acid to the anhydrous ethanol solution until the pH of the solution reaches 4.5; add 0.06 kg of silane coupling agent to the anhydrous ethanol solution and hydrolyze for 10 hours to obtain a mixed solution, then add 1 kg of white carbon black to the mixed solution, and stir for 6 hours in an 80°C water bath to react. Finally, wash and filter the white carbon black after the reaction with anhydrous ethanol, and dry at 50°C to constant weight to obtain modified white carbon black.

[0029] Example

[0030] Example 1

[0031] An extreme pressure anti-wear grease composition comprises the following steps:

[0032] S1. Weigh each substance according to weight: 70 kg of base oil, 0.5 kg of thickener, 1 kg of antioxidant and 3 kg of anti-wear agent, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3, the antioxidant is a shielded phenol antioxidant, and the antioxidant is 2,6-di-tert-butyl-4-methylphenol, the base oil is n-hexadecane, the anti-wear agent is a phosphate ester extreme pressure anti-wear agent and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is 1:1, and the phosphate ester extreme pressure anti-wear agent is tributyl phosphate;

[0033] S2. Take a portion of the base oil and heat it to (95±10)°C, add 12-hydroxystearic acid and azelaic acid to the heated base oil and mix them evenly to obtain a mixed solution, add lithium hydroxide monohydrate to an appropriate amount of water to dissolve the lithium hydroxide monohydrate and then add it to the mixed solution, then heat it to (100±3)°C to fully saponify and dehydrate the 12-hydroxystearic acid and azelaic acid, finally add the remaining base oil, continue to heat it to 205°C to fully thicken, and obtain a mixture;

[0034] S3. The mixture is cooled to 50° C. and then mixed with other substances, and ground on a three-roll mill for three times to disperse the soap fibers to obtain a product.

[0035] Example 2

[0036] The difference between this embodiment and embodiment 1 is: S1, weigh each substance according to weight, 95kg of base oil, 2kg of thickener, 3kg of antioxidant and 6kg of anti-wear agent, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3, the antioxidant is a shielded phenol antioxidant, and the antioxidant is 2,6-di-tert-butyl-4-methylphenol, the base oil is n-hexadecane, the anti-wear agent is a phosphate ester extreme pressure anti-wear agent and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is 2:1, and the phosphate ester extreme pressure anti-wear agent uses tributyl phosphate.

[0037] Example 3

[0038] The difference between this embodiment and embodiment 1 is: S1, weigh each substance according to weight, 80kg of base oil, 1kg of thickener, 1.5kg of antioxidant and 4kg of anti-wear agent, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3, the antioxidant is a shielded phenol antioxidant, and the antioxidant is 2,6-di-tert-butyl-4-methylphenol, the base oil is n-hexadecane, the anti-wear agent is a phosphate ester extreme pressure anti-wear agent and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is 1.5:1, and the phosphate ester extreme pressure anti-wear agent uses tributyl phosphate.

[0039] Example 4

[0040] The difference between this embodiment and embodiment 1 is that: S1. Weigh each substance according to weight, 90 kg of base oil, 1.7 kg of thickener, 2 kg of antioxidant and 4.5 kg of anti-wear agent, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3, the antioxidant is a shielded phenol antioxidant, and the antioxidant is 2,6-di-tert-butyl-4-methylphenol, the base oil is n-hexadecane, the anti-wear agent is a phosphate ester extreme pressure anti-wear agent and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is 1.5:1, and the phosphate ester extreme pressure anti-wear agent uses tributyl phosphate.

[0041] Example 5

[0042] The difference between this embodiment and embodiment 1 is: S1, weigh each substance according to weight, 85kg of base oil, 1.4kg of thickener, 1.7kg of antioxidant and 4.2kg of anti-wear agent, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3, the antioxidant is a shielded phenol antioxidant, and the antioxidant is 2,6-di-tert-butyl-4-methylphenol, the base oil is n-hexadecane, the anti-wear agent is a phosphate ester extreme pressure anti-wear agent and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is 1.5:1, and the phosphate ester extreme pressure anti-wear agent uses tributyl phosphate.

[0043] Example 6

[0044] The difference between this embodiment and embodiment 1 is that: S1, weigh each substance according to weight, 85kg of base oil, 1.4kg of thickener, 1.7kg of antioxidant and 4.2kg of anti-wear agent, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3, the antioxidant is a shielded phenol antioxidant and a diphenylamine antioxidant in a weight ratio of 1:1, and the shielded phenol antioxidant is 2,6-di-tert-butyl-4-methylphenol, the diphenylamine antioxidant is butyl octylated diphenylamine, the base oil is n-hexadecane, the anti-wear agent is a phosphate ester extreme pressure anti-wear agent and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is 1.5:1, and the phosphate ester extreme pressure anti-wear agent is tributyl phosphate.

[0045] Example 7

[0046] The difference between this embodiment and embodiment 1 is that: S1, weigh each substance according to weight, 85kg of base oil, 1.4kg of thickener, 1.7kg of antioxidant and 4.2kg of anti-wear agent, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3, the antioxidant is a shielded phenol antioxidant and a diphenylamine antioxidant in a mass ratio of 1:2, and the shielded phenol antioxidant is 2,6-di-tert-butyl-4-methylphenol, the diphenylamine antioxidant is butyl octylated diphenylamine, the base oil is n-hexadecane, the anti-wear agent is a phosphate ester extreme pressure anti-wear agent and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is 1.5:1, and the phosphate ester extreme pressure anti-wear agent is tributyl phosphate.

[0047] Example 8

[0048] The difference between this embodiment and embodiment 1 is that: S1, weigh each substance according to weight, 85kg of base oil, 1.4kg of thickener, 1.7kg of antioxidant and 4.2kg of anti-wear agent, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3, the antioxidant is a shielded phenol antioxidant and a diphenylamine antioxidant in a mass ratio of 1:1.5, and the shielded phenol antioxidant is 2,6-di-tert-butyl-4-methylphenol, the diphenylamine antioxidant is butyl octylated diphenylamine, the base oil is n-hexadecane, the anti-wear agent is a phosphate ester extreme pressure anti-wear agent and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is 1.5:1, and the phosphate ester extreme pressure anti-wear agent is tributyl phosphate.

[0049] Example 9

[0050] The difference between this embodiment and embodiment 1 is that: S1, weigh each substance according to weight, base oil 85kg, thickener 1.4kg, antioxidant 1.7kg, antiwear agent 4.2kg and modified white carbon black 1kg prepared in the preparation example, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3, and the antioxidant is 1.4kg. A shielded phenol antioxidant and a diphenylamine antioxidant are used in a mass ratio of 1:1.5, and the shielded phenol antioxidant is 2,6-di-tert-butyl-4-methylphenol, the diphenylamine antioxidant is butyl octylated diphenylamine, the base oil is n-hexadecane, the anti-wear agents are phosphate ester extreme pressure anti-wear agents and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is 1.5:1, and the phosphate ester extreme pressure anti-wear agent is tributyl phosphate.

[0051] Example 10

[0052] The difference between this embodiment and embodiment 1 is that: S1, weigh each substance according to weight, base oil 85kg, thickener 1.4kg, antioxidant 1.7kg, antiwear agent 4.2kg and modified white carbon black 2kg prepared in the preparation example, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3, and the antioxidant is 1:1:3. A shielded phenol antioxidant and a diphenylamine antioxidant are used in a mass ratio of 1:1.5, and the shielded phenol antioxidant is 2,6-di-tert-butyl-4-methylphenol, the diphenylamine antioxidant is butyl octylated diphenylamine, the base oil is n-hexadecane, the anti-wear agent is a phosphate ester extreme pressure anti-wear agent and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is 1.5:1, and the phosphate ester extreme pressure anti-wear agent is tributyl phosphate.

[0053] Embodiment 11

[0054] The difference between this embodiment and embodiment 1 is that: S1, weigh each substance according to weight, base oil 85kg, thickener 1.4kg, antioxidant 1.7kg, anti-wear agent 4.2kg and modified white carbon black 1.5kg prepared in the preparation example, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3, and the antioxidant is 1:1:3. The antioxidant adopts a shielded phenol antioxidant and a diphenylamine antioxidant in a mass ratio of 1:1.5, and the shielded phenol antioxidant is 2,6-di-tert-butyl-4-methylphenol, the diphenylamine antioxidant adopts butyl octylated diphenylamine, the base oil adopts n-hexadecane, the anti-wear agent is a phosphate ester extreme pressure anti-wear agent and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is 1.5:1, and the phosphate ester extreme pressure anti-wear agent adopts tributyl phosphate.

[0055] Example 12

[0056] The difference between this embodiment and embodiment 1 is that: S1, weigh each substance according to weight, base oil 85kg, thickener 1.4kg, antioxidant 1.7kg, anti-wear agent 4.2kg, modified white carbon black prepared in the preparation example 1.5kg and potassium feldspar powder 2kg, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1: 3. The antioxidant uses a shielded phenol antioxidant and a diphenylamine antioxidant in a mass ratio of 1:1.5, and the shielded phenol antioxidant is 2,6-di-tert-butyl-4-methylphenol, the diphenylamine antioxidant uses butyl octylated diphenylamine, the base oil uses n-hexadecane, the anti-wear agents are phosphate ester extreme pressure anti-wear agents and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is 1.5:1, and the phosphate ester extreme pressure anti-wear agent uses tributyl phosphate.

[0057] Example 13

[0058] The difference between this embodiment and embodiment 1 is that: S1, weigh each substance according to weight, base oil 85kg, thickener 1kg, antioxidant 1.7kg, antiwear agent 4.2kg, modified white carbon black prepared in the preparation example 1.5kg and potassium feldspar powder 2kg, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3 The antioxidant uses a shielded phenol antioxidant and a diphenylamine antioxidant in a mass ratio of 1:1.5, and the shielded phenol antioxidant is 2,6-di-tert-butyl-4-methylphenol, the diphenylamine antioxidant uses butyl octylated diphenylamine, the base oil uses n-hexadecane, the anti-wear agents are phosphate ester extreme pressure anti-wear agents and sulfided isobutylene, and the mass ratio of phosphate ester extreme pressure anti-wear agents and sulfided isobutylene is 1.5:1, and the phosphate ester extreme pressure anti-wear agent uses tributyl phosphate.

[0059] Embodiment 14

[0060] The difference between this embodiment and embodiment 1 is that: S1, weigh each substance according to weight, base oil 85kg, thickener 1kg, antioxidant 1.7kg, anti-wear agent 4.2kg, modified white carbon black prepared in the preparation example 1.5kg and potassium feldspar powder 4kg, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3 The antioxidant uses a shielded phenol antioxidant and a diphenylamine antioxidant in a mass ratio of 1:1.5, and the shielded phenol antioxidant is 2,6-di-tert-butyl-4-methylphenol, the diphenylamine antioxidant uses butyl octylated diphenylamine, the base oil uses n-hexadecane, the anti-wear agents are phosphate ester extreme pressure anti-wear agents and sulfided isobutylene, and the mass ratio of phosphate ester extreme pressure anti-wear agents and sulfided isobutylene is 1.5:1, and the phosphate ester extreme pressure anti-wear agent uses tributyl phosphate.

[0061] Embodiment 15

[0062] The difference between this embodiment and embodiment 1 is that: S1, weigh each substance according to weight, base oil 85kg, thickener 1kg, antioxidant 1.7kg, anti-wear agent 4.2kg, modified white carbon black prepared in the preparation example 1.5kg and potassium feldspar powder 3kg, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3 The antioxidant uses a shielded phenol antioxidant and a diphenylamine antioxidant in a mass ratio of 1:1.5, and the shielded phenol antioxidant is 2,6-di-tert-butyl-4-methylphenol, the diphenylamine antioxidant uses butyl octylated diphenylamine, the base oil uses n-hexadecane, the anti-wear agent is a phosphate ester extreme pressure anti-wear agent and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is 1.5:1, and the phosphate ester extreme pressure anti-wear agent uses tributyl phosphate.

[0063] Example 16

[0064] An extreme pressure anti-wear grease composition comprises the following steps:

[0065] S1. Weigh each substance according to weight, including 85 kg of base oil, 1 kg of thickener, 1.7 kg of antioxidant, 4.2 kg of anti-wear agent, 1.5 kg of modified white carbon black prepared in the preparation example and 3 kg of potassium feldspar powder, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3, the antioxidant is a shielded phenol antioxidant and a diphenylamine antioxidant in a mass ratio of 1:1.5, and the shielded phenol antioxidant is 2,6-di-tert-butyl-4-methylphenol, the diphenylamine antioxidant is butyl octylated diphenylamine, the base oil is n-hexadecane, the anti-wear agent is a phosphate ester extreme pressure anti-wear agent and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is 1.5:1, and the phosphate ester extreme pressure anti-wear agent is tributyl phosphate;

[0066] S2. Take a portion of the base oil and heat it to (95±10)°C, add 12-hydroxystearic acid and azelaic acid to the heated base oil and mix them evenly to obtain a mixed solution, add lithium hydroxide monohydrate to an appropriate amount of water to dissolve it, and then add it to the mixed solution, then heat it to (100±3)°C to fully saponify and dehydrate the 12-hydroxystearic acid and azelaic acid, then add the remaining base oil, continue to heat it to 205°C to fully thicken it, and obtain a mixture;

[0067] S3, cooling the mixture to 50°C, mixing the diphenylamine antioxidant and potassium feldspar, and then mixing with the cooled mixture and other substances, and grinding on a three-roll mill for 3 times to disperse the soap fibers to obtain a product.

[0068] Comparative Example

[0069] Comparative Example 1

[0070] An extreme pressure anti-wear grease composition comprises the following steps:

[0071] S1. Weigh each substance according to weight: 70 kg of base oil, 0.5 kg of thickener, 1 kg of antioxidant and 3 kg of anti-wear agent, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3, the antioxidant is a shielded phenol antioxidant, and the antioxidant is 2,6-di-tert-butyl-4-methylphenol, the base oil is n-hexadecane, the anti-wear agent is a phosphate ester extreme pressure anti-wear agent, and the phosphate ester extreme pressure anti-wear agent is tributyl phosphate;

[0072] S2. Take a portion of the base oil and heat it to (95±10)°C, add 12-hydroxystearic acid and azelaic acid to the heated base oil and mix them evenly to obtain a mixed solution, add lithium hydroxide monohydrate to an appropriate amount of water to dissolve it, and then add it to the mixed solution, then heat it to (100±3)°C to fully saponify and dehydrate the 12-hydroxystearic acid and azelaic acid, then add the remaining base oil, continue to heat it to 205°C to fully thicken it, and obtain a mixture;

[0073] S3. The mixture is cooled to 50° C. and then mixed with other substances, and ground on a three-roll mill for three times to disperse the soap fibers to obtain a product.

[0074] Comparative Example 2

[0075] An extreme pressure anti-wear grease composition comprises the following steps:

[0076] S1. Weigh each substance according to weight: 70 kg of base oil, 0.5 kg of thickener, 1 kg of antioxidant and 3 kg of anti-wear agent, wherein the thickener is 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate, and the molar ratio of 12-hydroxystearic acid, azelaic acid and lithium hydroxide monohydrate is 1:1:3, the antioxidant is a shielded phenol antioxidant, and the antioxidant is 2,6-di-tert-butyl-4-methylphenol, the base oil is n-hexadecane, and the anti-wear agent is sulfided isobutylene;

[0077] S2. Take a portion of the base oil and heat it to (95±10)°C, add 12-hydroxystearic acid and azelaic acid to the heated base oil and mix them evenly to obtain a mixed solution, add lithium hydroxide monohydrate to an appropriate amount of water to dissolve it, and then add it to the mixed solution, then heat it to (100±3)°C to fully saponify and dehydrate the 12-hydroxystearic acid and azelaic acid, then add the remaining base oil, continue to heat it to 205°C to fully thicken it, and obtain a mixture;

[0078] S3. The mixture is cooled to 50° C. and then mixed with other substances, and ground on a three-roll mill for three times to disperse the soap fibers to obtain a product.

[0079] Performance testing

[0080] The greases prepared in Examples 1-16 and Comparative Examples 1-2 were tested for cone penetration according to GB / T269, and the data were recorded in Table 1;

[0081] The extreme pressure and anti-wear properties of the greases prepared in Examples 1-16 and Comparative Examples 1-2 were tested according to SH / T 0204, and the data were recorded in Table 1;

[0082] The greases prepared in Examples 1-16 and Comparative Examples 1-2 were tested for oxidation stability according to SH / T 0325, and the data are recorded in Table 1;

[0083] The greases prepared in Examples 1-16 and Comparative Examples 1-2 were tested for evaporation loss according to ASTM D2595, and the data are recorded in Table 1.

[0084] Table 1

[0085]

[0086]

[0087] Combining Example 1, Comparative Example 1 and Comparative Example 2 with Table 1, it can be seen that the four-ball wear scar diameter is smaller when the phosphate ester extreme pressure anti-wear agent and sulfided isobutylene are used in combination than when the two are used alone, that is, the combined use of the two anti-wear agents significantly improves the anti-wear property of the grease composition;

[0088] Combining Example 5 and Example 6 with Table 1, it can be seen that the use of shielded phenol antioxidant and diphenylamine antioxidant in Example 6 can significantly improve the antioxidant performance of the grease composition;

[0089] Combining Example 8 and Example 9 with Table 1, it can be seen that the addition of modified silica further improves the wear resistance of the friction surface. The reason is that the modified silica is combined with the thickener, which, on the one hand, allows the modified silica to adsorb impurities, so that the impurities are not easy to gather on the friction surface, thereby making the friction surface not easy to be worn; on the other hand, it can make the modified silica not easy to gather on the friction surface, thereby not easy to wear the friction surface;

[0090] Combining Example 11 and Example 12 with Table 1, it can be seen that the addition of potassium feldspar powder improves the consistency of the grease composition and improves the anti-oxidation performance of the grease composition. The reason is that the diphenylamine antioxidant forms diphenylamine free radicals after oxidation, and the potassium feldspar powder can react with the diphenylamine free radicals so that the diphenylamine free radicals are not easy to react with the base oil in the grease composition, thereby improving the oxidation stability of the grease composition;

[0091] Combining Example 15 and Example 16 with Table 1, it can be seen that the premixing of potassium feldspar powder and diphenylamine antioxidant improves the antioxidant performance of the grease composition. The reason is that potassium feldspar powder can better adsorb diphenylamine free radicals, thereby further improving the oxidative stability of the grease composition.

[0092] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. An extreme pressure anti-wear grease composition, characterized in that: The invention comprises the following components in parts by weight: 70-95 parts of base oil, 0.5-2 parts of thickener, 1-3 parts of antioxidant and 3-6 parts of anti-wear agent, wherein the anti-wear agent comprises a phosphate ester extreme pressure anti-wear agent and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is (1-2):

1.

2. The extreme pressure anti-wear grease composition according to claim 1, characterized in that: The grease composition comprises the following components in parts by weight: 80-90 parts of base oil, 1-1.7 parts of thickener, 1.5-2 parts of antioxidant and 4-4.5 parts of anti-wear agent, wherein the anti-wear agent comprises a phosphate ester extreme pressure anti-wear agent and sulfided isobutylene, and the mass ratio of the phosphate ester extreme pressure anti-wear agent to the sulfided isobutylene is 1.5:

1.

3. The extreme pressure anti-wear grease composition according to claim 1, characterized in that: The grease composition further comprises 1-2 parts by mass of modified white carbon black.

4. The extreme pressure anti-wear grease composition according to claim 1, characterized in that: The modified white carbon black is prepared by modifying white carbon black with a silane coupling agent.

5. The extreme pressure anti-wear grease composition according to claim 1, characterized in that: The anti-wear agent also includes 2-4 parts by weight of potassium feldspar powder.

6. The extreme pressure anti-wear grease composition according to claim 1, characterized in that: The antioxidant is a shielded phenol antioxidant.

7. The extreme pressure anti-wear grease composition according to claim 5, characterized in that: The antioxidants are shielded phenol antioxidants and diphenylamine antioxidants, and the mass ratio of the shielded phenol antioxidants to the diphenylamine antioxidants is 1:(1-2).

8. A method for preparing an extreme pressure anti-wear grease composition, characterized in that: The steps include: S1. Weigh each substance according to mass; S2, mixing the thickener and the base oil to obtain a mixture; S3, cooling the mixture, mixing it with other substances, and grinding it on a three-roll mill to disperse the soap fibers to obtain a product.

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