Antioxidant lubricating grease as well as preparation method and application thereof

Abstract

The invention provides antioxidant lubricating grease as well as a preparation method and application thereof, and the antioxidant lubricating grease comprises the following components in parts by weight: 60-70 parts of base oil, 5-10 parts of a thickening agent, 1-5 parts of an antioxidant and 1-3 parts of an anticorrosive agent. The preparation method comprises the following steps: (1) adding the thickening agent and the anticorrosive agent into the first part of base oil, and stirring and mixing at 50-70 DEG C to obtain a first mixed solution; (2) adding an amine antioxidant, a phenolic antioxidant, 3, 5-dihydroxybenzamide and 2, 6-sodium naphthalene disulfonate into the second part of base oil, and stirring and mixing at 45-80 DEG C to obtain a second mixed solution; and (3) stirring the first mixed solution and the second mixed solution at 40-80 DEG C to obtain the antioxidant lubricating grease. According to the antioxidant lubricating grease provided by the invention, the oxidation resistance and the stability of the lubricating grease are improved.

Description

Technical Field

[0001] This application relates to the field of lubricating materials technology, and in particular to an antioxidant lubricating grease, its preparation method and application. Background Technology

[0002] Lubricating grease is a semi-solid lubricant composed of base oil, thickener, and additives. It is used for lubrication, primarily reducing mechanical friction and preventing mechanical wear. It also provides protection against metal corrosion and acts as a sealant against dust. One of the main functions of lubricating oil is to reduce friction and extend the service life of mechanical equipment. However, under external conditions such as high temperature, sunlight, and oxygen, lubricating oil is prone to oxidation, leading to a decline in oil performance and even accelerating equipment wear. To address this problem, antioxidants are often added to lubricating oil to slow down the oxidation process and maintain oil stability and service life. Commonly used antioxidants include amine antioxidants, phenolic antioxidants, and zinc dialkyl dithiophosphate (ZDDP), which provide certain thermal stability and antioxidant properties to lubricating grease.

[0003] However, with the rapid development of industry, the requirements for lubricating materials are increasing, and there are more stringent requirements for the stability of lubricating grease under long-term operation. The insufficiency of traditional antioxidants leads to the failure of lubricating grease and a shortened service life, thus making it impossible to provide long-term stable lubrication for mechanical equipment. Summary of the Invention

[0004] This application provides an antioxidant lubricating grease, its preparation method, and its application, in order to solve the problems mentioned in the background art.

[0005] In a first aspect, this application provides an antioxidant lubricating grease, which comprises the following components in parts by weight: The ingredients are: 60-70 parts by weight of base oil, 5-10 parts by weight of thickener, 1-5 parts by weight of antioxidant, and 1-3 parts by weight of corrosion inhibitor.

[0006] Optionally, the base oil includes one or more of mineral oil, polyalphaolefin, silicone oil, and ester oil.

[0007] Optional, the mineral oil includes 150SN and / or 300SN; Polyalphaolefins include at least one of PAO 40, PAO 100, and PAO 300; Silicone oils include polydimethylsiloxane and / or benzyl silicone oil; Ester oils include trimethylolpropane oleate and / or dipentaerythritol ester.

[0008] Optional antioxidants include amine antioxidants, phenolic antioxidants, 3,5-dihydroxybenzamide, and sodium 2,6-naphthalenedisulfonate.

[0009] Optionally, the weight ratio of amine antioxidants, phenolic antioxidants, 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate is 1:1-2:0.3-0.5:0.2-0.5.

[0010] Optionally, amine antioxidants include at least one of dinonyldiphenylamine, diisooctyldiphenylamine, N-phenyl-N'-cyclohexyl-p-phenylenediamine, and 4,4'-diaminodiphenylmethane.

[0011] Optionally, phenolic antioxidants include at least one of butylated hydroxyanisole, 2,6-di-tert-butyl-p-cresol, and 4,4'-thiobis(6-tert-butyl-3-methylphenol).

[0012] Optionally, the corrosion inhibitor includes at least one of dodecenylsuccinic acid, alkyl succinic acid, barium petroleum sulfonate, tricresyl phosphate, and dodecenylsuccinic acid.

[0013] Secondly, this application provides a method for preparing an antioxidant lubricating grease. The method for preparing the aforementioned antioxidant lubricating grease includes the following steps: (1) Add the thickener and corrosion inhibitor to the first part of the base oil according to the weight, and stir and mix at 50-70℃ for 20-30 minutes to obtain the first mixture; (2) Add amine antioxidants, phenolic antioxidants, 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate to the second part of the base oil according to the weight, and stir and mix at 45-80℃ for 10-30 min to obtain the second mixture; (3) Mix the first mixture and the second mixture at 40-80℃ and stir for 10-20 minutes to obtain an antioxidant grease.

[0014] Thirdly, this application provides an application of an antioxidant grease prepared by the above method in the field of lubrication.

[0015] The antioxidant grease, its preparation method, and its application provided in this application realize the preparation of antioxidant grease, and compared with the prior art, it has the following beneficial effects: (1) This application uses base oil as the main component of the grease. Its main lubricating function is achieved by using a three-dimensional network formed by a thickener to adsorb and fix the base oil in the structure, keeping the grease in a semi-solid state during friction. This prevents the grease from being lost due to increased fluidity under high temperature and / or high pressure lubrication, thus ensuring the continuity of the lubricating oil film between the friction pairs. By adding antioxidants, the oxidative degradation of the grease is delayed, thereby extending its service life and maintaining performance stability. Corrosion inhibitors can adsorb or react on the metal surface to form a dense protective layer, while neutralizing the acidic byproducts produced by lubricant oxidation, preventing acidic corrosion of the equipment. Furthermore, this application uses a special ratio of each component to allow each component to fully exert its performance and work synergistically to improve the stability and oxidation resistance of the grease, thereby improving the stability and service life of the grease and providing continuous and stable lubrication for the friction pairs.

[0016] (2) The addition of 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate in this application helps to form an inert film on the metal surface during the friction process as the surface temperature of the friction pair increases, thus isolating the metal ions from contact with the grease and inhibiting oxidation. At the same time, through the synergistic effect between amine antioxidants, phenolic antioxidants, 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate, the oxidation of the grease is inhibited directly or indirectly in different directions, avoiding the failure of the lubricating oil film on the friction pair surface and the generation of carbon deposits and other substances on the friction pair due to the oxidation of the grease during the friction process, thus ensuring the lubrication effect of the grease.

[0017] (3) The method for preparing the antioxidant grease provided in this application is simple and suitable for large-scale production. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 The average coefficient of friction diagrams for the antioxidant greases provided in Examples 1-3 and Comparative Examples 1-7; Figure 2 The average wear volume diagrams are for the antioxidant greases provided in Examples 1-3 and Comparative Examples 1-7. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0021] This application provides an antioxidant lubricating grease, its preparation method, and its application, in order to solve the problems mentioned in the background art.

[0022] In a first aspect, this application provides an antioxidant lubricating grease, which comprises the following components in parts by weight: The ingredients are: 60-70 parts by weight of base oil, 5-10 parts by weight of thickener, 1-5 parts by weight of antioxidant, and 1-3 parts by weight of corrosion inhibitor.

[0023] Specifically, the antioxidant grease provided in this application includes base oil, thickener, antioxidant, and corrosion inhibitor. The base oil, as the main component of the grease, plays a primary lubricating role and also acts as a solvent for other components, allowing them to dissolve or disperse more uniformly, forming a homogeneous antioxidant grease. During lubrication, this grease forms a uniform oil film on the friction pair surface, achieving effective lubrication of the machinery. The thickener forms a three-dimensional network through fibers or particles, adsorbing and fixing the base oil within the structure to form a semi-solid grease. This structure prevents the base oil from flowing out too quickly under high temperatures or mechanical shear, thus reducing the risk of oxidation due to oil film rupture. The main function of the antioxidant is to delay the oxidative degradation of the grease, thereby extending its service life and maintaining performance stability, ensuring the effectiveness of the lubricating oil film on the friction pair surface, and thus guaranteeing the lubricating performance of the grease. Corrosion inhibitors can adsorb or react on metal surfaces to form a dense protective layer (such as a passivation film or organic film), which isolates moisture and oxygen, while neutralizing acidic byproducts (such as sulfur-containing and nitrogen-containing oxides) produced by lubricant oxidation, thus preventing acidic corrosion of equipment.

[0024] The thickener is selected from lithium 12-hydroxystearate and / or sebacic acid and boric acid.

[0025] This application uses base oil as the main component of the grease. Its primary lubricating function is achieved through a three-dimensional network formed by a thickener, which adsorbs and fixes the base oil within the structure. This keeps the grease in a semi-solid state during friction, preventing loss due to increased fluidity under high temperature and / or high pressure lubrication, thus ensuring the continuity of the lubricating film between the friction pairs. The addition of antioxidants delays the oxidative degradation of the grease, thereby extending its service life and maintaining performance stability. Corrosion inhibitors adsorb or react on metal surfaces to form a dense protective layer, while neutralizing acidic byproducts produced by lubricant oxidation, preventing acidic corrosion of equipment. Furthermore, this application uses a specific ratio of components to ensure that each component fully utilizes its performance and works synergistically to improve the stability and oxidation resistance of the grease, thereby enhancing its stability and service life and providing continuous and stable lubrication for the friction pairs.

[0026] Optionally, the base oil includes one or more of mineral oil, polyalphaolefin, silicone oil, and ester oil.

[0027] Optional, the mineral oil includes 150SN and / or 300SN; Polyalphaolefins include at least one of PAO 40, PAO 100, and PAO 300; Silicone oils include polydimethylsiloxane and / or benzyl silicone oil; Ester oils include trimethylolpropane oleate and / or dipentaerythritol ester.

[0028] Optional antioxidants include amine antioxidants, phenolic antioxidants, 3,5-dihydroxybenzamide, and sodium 2,6-naphthalenedisulfonate.

[0029] Specifically, amine antioxidants delay the oxidative degradation of grease by interrupting free radical chain reactions and decomposing peroxides. During friction, base oil or thickener generates alkyl free radicals (R·), which react with oxygen to generate peroxy free radicals (ROO·). ROO· removes hydrogen atoms from the oil to generate hydroperoxides (ROOH) and new free radicals (R·), accelerating oxidation in a cycle. The free radicals combine to form stable products, thus terminating the oxidation process of the grease.

[0030] Phenolic antioxidants primarily inhibit the oxidation of lubricating greases by terminating free radical chain reactions through hydrogen donation and stabilizing oxidation intermediates. During the oxidation of lubricating greases, peroxy radicals (ROO·) continuously attack base oil molecules, triggering chain reactions. The hydrogen atoms of the phenolic hydroxyl groups in phenolic antioxidants are highly reactive and can be captured by ROO· to ​​generate stable phenoxy radicals (ArO·), thereby terminating the chain reaction. The generated phenoxy radicals (ArO·) are highly stable due to the benzene ring conjugation effect and cannot continue to trigger new oxidation reactions. Ultimately, they form inert products through dimerization or other means, achieving the antioxidant effect.

[0031] Metal ions in lubricating oil act as oxidation catalysts during friction. The addition of 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate can form an inert film on the metal surface during the friction process as the surface temperature of the friction pair increases, isolating the metal ions from contact with the lubricating grease and thus inhibiting oxidation. In this application, through the synergistic effect of amine antioxidants, phenolic antioxidants, 3,5-dihydroxybenzamide, and sodium 2,6-naphthalenedisulfonate, the oxidation of lubricating grease is inhibited directly or indirectly in different directions, preventing the lubricating oil film on the friction pair surface from failing, and avoiding the formation of carbon deposits and other substances on the friction pair due to lubricating grease oxidation during friction, thus ensuring the lubrication effect of the lubricating grease.

[0032] Optionally, the weight ratio of amine antioxidants, phenolic antioxidants, 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate is 1:1-2:0.3-0.5:0.2-0.5.

[0033] Specifically, by specially combining several antioxidants, not only are antioxidants exerted, but the synergistic effect among these antioxidants also ensures the antioxidant properties of the grease, thereby improving its stability and service life.

[0034] Optionally, amine antioxidants include at least one of dinonyldiphenylamine, diisooctyldiphenylamine, N-phenyl-N'-cyclohexyl-p-phenylenediamine, and 4,4'-diaminodiphenylmethane.

[0035] Optionally, phenolic antioxidants include at least one of butylated hydroxyanisole, 2,6-di-tert-butyl-p-cresol, and 4,4'-thiobis(6-tert-butyl-3-methylphenol).

[0036] Optionally, the corrosion inhibitor includes at least one of dodecenylsuccinic acid, alkyl succinic acid, barium petroleum sulfonate, tricresyl phosphate, and dodecenylsuccinic acid.

[0037] Secondly, this application provides a method for preparing an antioxidant lubricating grease, the method comprising the following steps: (1) Add the thickener and corrosion inhibitor to the first part of the base oil according to the weight, and stir and mix at 50-70℃ for 20-30 minutes to obtain the first mixture;

[0038] (2) Add amine antioxidants, phenolic antioxidants, 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate to the remaining second part of base oil according to the weight, and stir and mix at 45-80℃ for 10-30 min to obtain the second mixture; (3) Stir the first mixture and the second mixture at 40-80℃ for 10-20 minutes to obtain an antioxidant grease.

[0039] Specifically, the first part of the base oil comprises 30-50% of the total base oil weight, and the second part comprises 50-70% of the total base oil weight. Limiting the temperature during stirring not only improves the fluidity of the grease, thus facilitating the dispersion or dissolution of each component within the base oil, but also promotes interaction between the components. This allows the base oil and other components to be adsorbed and fixed within the three-dimensional network structure of the thickener, thereby maintaining the structural stability of the grease during lubrication and improving its lubricating performance.

[0040] Thirdly, this application provides an application of the antioxidant grease prepared by the above method in the field of lubrication. The antioxidant grease provided in this application is used in the lubrication of mechanical equipment, such as bearings, engines, and transmission devices, and is particularly suitable for mechanical equipment that requires high temperature and oxidation resistance.

[0041] The following are embodiments and effect test examples of this application, further describing the technical solution and technical effects of the present invention. However, the scope of protection of the present invention is not limited to these embodiments. Any changes or equivalent substitutions that do not depart from the concept of the present invention are within the scope of protection of the present invention. Furthermore, for those embodiments where specific technical operation steps or conditions are not specified, they are performed according to the techniques or conditions described in general literature in the art or according to the product instructions. Reagents or instruments used, unless otherwise specified, are all commercially available conventional products. Example 1

[0042] A method for preparing an antioxidant lubricating grease, the method comprising the following steps: (1) Add 5 parts by weight of thickener (lithium 12-hydroxystearate) and 1 part by weight of corrosion inhibitor (dodecenyl succinic acid) to the first part of base oil, stir and mix at 50°C for 20-30 min to obtain the first mixture; The base oil is selected from PAO 100, and the amount of base oil used in the first part is 18 parts by weight.

[0043] (2) According to the weight parts, add amine antioxidant (dinonyldiphenylamine), phenolic antioxidant (2,6-di-tert-butyl-p-cresol), 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate to the second part of the base oil, stir and mix at 45°C for 10-30 min to obtain the second mixture; The amount of antioxidant added is 1 part by weight, and the weight ratio of amine antioxidant, phenolic antioxidant, 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate is 1:1:0.3:0.2; the second part is 42 parts by weight of base oil.

[0044] (3) Stir the first mixture and the second mixture at 40°C for 10 minutes to obtain an antioxidant grease. Example 2

[0045] A method for preparing an antioxidant lubricating grease, the method comprising the following steps: (1) Add 7 parts by weight of thickener (lithium 12-hydroxystearate) and 2 parts by weight of corrosion inhibitor (dodecenyl succinic acid) to the first part of base oil, stir and mix at 60°C for 25 min to obtain the first mixture; The base oil is selected from PAO 100, and the first part of the base oil is 26 parts by weight.

[0046] (2) According to the weight parts, add amine antioxidant (dinonyldiphenylamine), phenolic antioxidant (2,6-di-tert-butyl-p-cresol), 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate to the second part of the base oil, stir and mix at 60°C for 20 min to obtain the second mixture; The amount of antioxidant added is 3 parts by weight, and the weight ratio of amine antioxidant, phenolic antioxidant, 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate is 1:2:0.4:0.3. The second part consists of base oils, which make up 60% of the total base oil weight.

[0047] (3) Stir the first mixture and the second mixture at 60°C for 20 minutes to obtain an antioxidant grease. Example 3

[0048] A method for preparing an antioxidant lubricating grease, the method comprising the following steps: (1) Add 10 parts by weight of thickener (lithium 12-hydroxystearate) and 3 parts by weight of corrosion inhibitor (dodecenyl succinic acid) to the first part of base oil, stir and mix at 70°C for 30 min to obtain the first mixture; The base oil is selected from PAO 100, and the first part of the base oil is 35 parts by weight.

[0049] (2) According to the weight parts, add amine antioxidant (dinonyldiphenylamine), phenolic antioxidant (2,6-di-tert-butyl-p-cresol), 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate to the second part of the base oil, stir and mix at 80°C for 30 min to obtain the second mixture; The amount of antioxidant added is 5 parts by weight, and the weight ratio of amine antioxidant, phenolic antioxidant, 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate is 1:2:0.5:0.5. The second part is 70% of the base oil by weight (35).

[0050] (3) Stir the first mixture and the second mixture at 80°C for 20 minutes to obtain an antioxidant grease.

[0051] Comparative Example 1 A method for preparing an antioxidant lubricating grease, the method comprising the following steps: The difference from Example 2 is that: (2) The amount of antioxidant added is 3 parts by weight, and the weight ratio of amine antioxidant, phenolic antioxidant, 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate is 1:2:0.6:0.3.

[0052] Comparative Example 2 A method for preparing an antioxidant lubricating grease, the method comprising the following steps: The difference from Example 2 is that: (2) The amount of antioxidant added is 3 parts by weight, and the weight ratio of amine antioxidant, phenolic antioxidant, 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate is 1:2:0.4:0.6.

[0053] Comparative Example 3 A method for preparing an antioxidant lubricating grease, the method comprising the following steps: The difference from Example 2 is that: (2) The amount of antioxidant added is 3 parts by weight, and the weight ratio of amine antioxidant, phenolic antioxidant, 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate is 1:2:0.2:0.3.

[0054] Comparative Example 4 A method for preparing an antioxidant lubricating grease, the method comprising the following steps: The difference from Example 2 is that: (2) The amount of antioxidant added is 3 parts by weight, and the weight ratio of amine antioxidant, phenolic antioxidant, 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate is 1:2:0.4:0.2.

[0055] Comparative Example 5 A method for preparing an antioxidant lubricating grease, the method comprising the following steps: The difference from Example 2 is that: (2) No 3,5-dihydroxybenzamide is added to the antioxidant.

[0056] Comparative Example 6 A method for preparing an antioxidant lubricating grease, the method comprising the following steps: The difference from Example 2 is that: (2) No sodium 2,6-naphthalenedisulfonate is added to the antioxidant.

[0057] Comparative Example 7 A method for preparing an antioxidant lubricating grease, the method comprising the following steps: The difference from Example 2 is that: (2) No sodium 2,6-naphthalenedisulfonate and 3,5-dihydroxybenzamide are added to the antioxidant.

[0058] Experimental Example 1 Oxidation induction time test of antioxidant grease Take 2-3 mg of the antioxidant grease provided in Examples 1-3 and Comparative Examples 1-7 into an open aluminum crucible. Place the crucible in the reaction body of a high-pressure differential scanning calorimeter. After sealing, introduce N2 until the pressure of the reaction body reaches 3.5 MPa. Increase the temperature to 200°C at 100°C / min and maintain this temperature. Turn off N2 and introduce O2 at 100 mL / min. Start recording the DSC curve at this time. A stable curve indicates that no oxidation has occurred. When the curve shows an inflection point, record the time required for the process. The results are shown in Table 1.

[0059] Table 1 Oxidation induction time / h Example 1 1026 Example 2 1205 Example 3 1146 Comparative Example 1 1024 Comparative Example 2 1006 Comparative Example 3 921 Comparative Example 4 934 Comparative Example 5 856 Comparative Example 6 901 Comparative Example 7 739 As shown in Table 1, the antioxidant properties of the antioxidant greases provided in Examples 1-3 of this application are significantly improved compared to the comparative examples. In this application, amine antioxidants, phenolic antioxidants, 3,5-dihydroxybenzamide, and sodium 2,6-naphthalenedisulfonate synergistically enhance the antioxidant properties of the antioxidant grease. The addition of 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate forms an inert film on the metal surface during friction as the surface temperature of the friction pair increases, isolating metal ions from contact with the grease and thus indirectly inhibiting oxidation. Together with amine and phenolic antioxidants, they directly or indirectly inhibit the oxidation of the grease in different directions, preventing the lubricating oil film on the friction pair surface from failing, carbon deposits and other substances from forming on the friction pair due to grease oxidation during friction, thus ensuring the lubrication effect of the grease.

[0060] Experimental Example 2 Lubrication performance test of antioxidant grease The average coefficient of friction and average wear volume of the antioxidant greases provided in Examples 1-3 and Comparative Examples 1-7 were tested.

[0061] Test Method: Friction and wear performance tests were conducted using the SRV-5 micro-vibration friction and wear testing machine manufactured by Optimol Grease GmbH, Germany. Test conditions: ball-disk point contact, temperature 120℃, frequency 50Hz, amplitude 1mm, test time 30min; the upper test ball was a Φ10mm AISI 52100 steel ball with a hardness of 59-61HRC; in the steel / steel friction pair, the lower sample was a Φ24mm, 7.9mm thick AISI 52100 steel block with a hardness of 59-61HRC, with a load of 200N. The wear volume of the lower sample was measured using a BRUKER-NPFLEX three-dimensional optical profilometer. At least three parallel tests were performed for each test, and the average value was taken to obtain the test results. Figure 1 and Figure 2 As shown. Figure 1 The average coefficient of friction diagrams for the antioxidant greases provided in Examples 1-3 and Comparative Examples 1-7; Figure 2 The average wear volume diagrams are for the antioxidant greases provided in Examples 1-3 and Comparative Examples 1-7.

[0062] Depend on Figure 2 It is evident that the antioxidant grease provided in this application possesses excellent lubricating performance. The base oil plays the primary lubricating role, while the thickener, through fibers or particles, forms a three-dimensional network, adsorbing and fixing the base oil within the structure to form a semi-solid grease. This allows the grease to maintain a relatively good semi-solid state even when the temperature rises during friction, thereby ensuring the continuity of the lubricating oil film. Simultaneously, the addition of antioxidants not only significantly improves the grease's antioxidant properties but also has a positive effect on its friction-reducing and anti-wear properties. Further observation... Figure 1 , Figure 2 It is known that increasing the amount of 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate does not further promote the antioxidant and lubricating properties of the grease. Therefore, the amount of 3,5-dihydroxybenzamide and sodium 2,6-naphthalenedisulfonate added needs to be combined with other components in a specific ratio to promote antioxidant and lubricating properties.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An antioxidant lubricating grease, characterized in that, The antioxidant grease comprises the following components in parts by weight: The ingredients are: 60-70 parts by weight of base oil, 5-10 parts by weight of thickener, 1-5 parts by weight of antioxidant, and 1-3 parts by weight of corrosion inhibitor.

2. The antioxidant grease according to claim 1, characterized in that, The base oil includes one or more of mineral oil, polyalphaolefin, silicone oil, and ester oil.

3. The antioxidant grease according to claim 2, characterized in that, The mineral oil includes 150SN and / or 300SN; The polyalphaolefin includes at least one of PAO 40, PAO 100, and PAO 300; The silicone oil includes polydimethylsiloxane and / or benzyl silicone oil; The ester oils include trimethylolpropane oleate and / or dipentaerythritol ester.

4. The antioxidant grease according to claim 1, characterized in that, The antioxidants include amine antioxidants, phenolic antioxidants, 3,5-dihydroxybenzamide, and sodium 2,6-naphthalenedisulfonate.

5. The antioxidant grease according to claim 4, characterized in that, The weight ratio of the amine antioxidant, the phenolic antioxidant, the 3,5-dihydroxybenzamide, and the sodium 2,6-naphthalenedisulfonate is 1:1-2:0.3-0.5:0.2-0.

5.

6. The antioxidant grease according to claim 4, characterized in that, Amine antioxidants include at least one of dinonyldiphenylamine, diisooctyldiphenylamine, N-phenyl-N'-cyclohexyl-p-phenylenediamine, and 4,4'-diaminodiphenylmethane.

7. The antioxidant grease according to claim 4, characterized in that, The phenolic antioxidants include at least one of butylated hydroxyanisole, 2,6-di-tert-butyl-p-cresol, and 4,4'-thiobis(6-tert-butyl-3-methylphenol).

8. The antioxidant grease according to claim 1, characterized in that, The corrosion inhibitor includes at least one of dodecenyl succinic acid, alkyl succinic acid, barium petroleum sulfonate, tricresyl phosphate, and dodecenyl succinic acid.

9. A method for preparing an antioxidant lubricating grease, characterized in that, The preparation method is used to prepare the antioxidant lubricating grease according to any one of claims 1-8, and the preparation method includes the following steps: (1) Add the thickener and the corrosion inhibitor to the base oil in the first part by weight, and stir and mix at 50-70°C for 20-30 minutes to obtain the first mixture; (2) The amine antioxidant, the phenol antioxidant, the 3,5-dihydroxybenzamide and the sodium 2,6-naphthalenedisulfonate are added to the base oil in the second part by weight and stirred at 45-80°C for 10-30 min to obtain the second mixture; (3) Mix the first mixture and the second mixture at 40-80°C for 10-20 minutes to obtain the antioxidant grease.

10. The application of an antioxidant grease prepared by the method described in claim 9 above in the field of lubrication.

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