Antioxidant lubricating oil and method for producing the same

Abstract

The application relates to the field of lubricating oil, in particular to an antioxidant lubricating oil and a preparation method thereof. The lubricating oil comprises the following components in parts by weight: 80-90 parts of vegetable base oil, a forming additive; the forming additive comprises 3-6 parts of an antioxidant, 6-10 parts of a viscosity modifier, 2-5 parts of an anti-foaming agent and 2-5 parts of an anti-rust agent; the antioxidant comprises 40-60 wt% of p-diisooctyl diphenylamine, 20-30 wt% of a metal passivator, 5-8 wt% of a thiophosphate and the rest of mercaptan; the preparation method comprises pretreatment, one-step mixing and two-step mixing; the antioxidant of the application is prepared by compounding p-diisooctyl diphenylamine, a metal passivator, a thiophosphate and mercaptan, the antioxidant performance of the lubricating oil is greatly improved, and the problem that lubricating oil is difficult to stably lubricate in some lubricating operations with high humidity and long equipment running cycle is solved.

Description

Technical Field

[0001] This application relates to the field of lubricating oils, and more specifically, to an antioxidant lubricating oil and a method for preparing the same. Background Technology

[0002] Lubricating oil is a liquid substance used to reduce or eliminate friction between two or more contacting surfaces. The main function of lubricating oil is to reduce or eliminate friction by forming a lubricating film, thereby achieving energy savings, reduced wear, and extended equipment lifespan.

[0003] However, lubricating oil is affected by various factors during use, one of the most common problems being oxidation. Oxidation refers to the process by which lubricating oil reacts with oxygen in the air under conditions such as high temperature, high pressure, and high humidity, forming organic peroxides. These organic peroxides not only reduce the quality of the lubricating oil but also damage equipment, potentially leading to equipment failure or safety accidents in severe cases.

[0004] To address the oxidation problem of lubricating oils, some scholars and companies have made efforts, mainly in two directions: 1. Improving the refining technology of base oils to increase the proportion of stable organic compounds with antioxidant properties, thereby improving the oxidation resistance of lubricating oils; however, the selection of base oils is diverse, and some base oils are limited by the application scenario, requiring the use of base oils with poor oxidation resistance, thus this method has significant limitations; 2. Adding antioxidants to lubricating oils to improve their oxidation resistance; however, the quality of antioxidants varies greatly. In lubrication operations with high humidity and long equipment operating cycles, lubricating oils with superior oxidation resistance are required. Current technologies for adding antioxidants to lubricating oils still struggle to achieve stable lubrication operations under these conditions. Therefore, how to select and improve antioxidants for lubricating oils in these environments remains a problem that needs to be solved. Summary of the Invention

[0005] In order to improve the problem that lubricating oil is difficult to provide stable lubrication in some lubrication operations with high humidity and long equipment operation cycles, this application provides an antioxidant lubricating oil and its preparation method.

[0006] In a first aspect, this application provides an antioxidant lubricating oil, which adopts the following technical solution:

[0007] An antioxidant lubricating oil comprises the following components in parts by weight: 80-90 parts of vegetable base oil and molding additives;

[0008] Molding additives include 3-6 parts antioxidant, 6-10 parts viscosity modifier, 2-5 parts antifoaming agent, and 2-5 parts rust inhibitor;

[0009] The antioxidants include 40–60 wt% p-diisooctyl diphenylamine, 20–30 wt% metal passivating agent, 5–8 wt% thiophosphate, and the balance being thiols.

[0010] By adopting the above technical solution, the antioxidant in this application is a combination of p-diisooctyl diphenylamine, a metal passivator, thiophosphate, and thiol. The antioxidant mechanism of p-diisooctyl diphenylamine is to inhibit the generation of free radicals during the oxidation process of lubricating oil, thus slowing down the rate of oxidation. The metal passivator can slow down or prevent the oxidation rate of lubricating oil by passivating the metal catalyst at the contact interface. The antioxidant mechanisms of thiophosphate and thiol are to destroy already formed oxidative free radicals, thereby terminating the oxidation reaction. Therefore, the oxidant provided in this application, by utilizing the synergistic effect of the above four substances, greatly improves the antioxidant performance of the lubricating oil and optimizes the problem of stable lubrication in some high-humidity, long-operational-cycle lubrication operations in related technologies.

[0011] In one specific implementation, the lubricant comprises the following components in parts by weight: 84 parts of vegetable base oil and molding additives;

[0012] The molding additives include 5 parts antioxidant, 8 parts viscosity modifier, 4 parts antifoaming agent, and 4 parts rust inhibitor;

[0013] The antioxidants include 51 wt% p-diisooctyl diphenylamine, 26 wt% metal passivator, 7 wt% thiophosphate, and 16 wt% thiols.

[0014] By adopting the above technical solution, when the components of the lubricating oil are formulated in the above proportions, its overall performance, especially its antioxidant performance, is even better.

[0015] In one specific implementation, the vegetable base oil is a vegetable oil including olive oil, castor oil, soybean oil, and rapeseed oil.

[0016] By adopting the above technical solutions, the base oils used in this application are all vegetable base oils such as olive oil, castor oil, soybean oil, and rapeseed oil, eliminating industrial base oils produced by petroleum cracking, which is more environmentally friendly. In addition, the selected vegetable oils generally have higher flash points, which greatly improves the safety of the lubricating oil during production, storage, and transportation, and has good practical value.

[0017] In one specific implementation scheme, the vegetable base oil is modified palm oil; the modification process of the palm oil includes the following steps:

[0018] 1. Hydrolysis: Mix palm oil, water, and sodium carbonate, and hydrolyze completely;

[0019] II. Saponification: The hydrolysis product from step one is mixed with alcohol and saponified at pH 5.

[0020] 3. Epoxidation: The saponification product from step 2 is oxidized under acidic conditions using an oxidizing agent to obtain modified palm oil containing epoxy alcohol esters.

[0021] By adopting the above technical solution, when palm oil is selected as the base oil and processed by the above process, the β-H content in the palm oil molecule is greatly reduced, and the saturation of the lubricating oil's own structure is increased, thereby making the lubricating oil have better antioxidant properties.

[0022] In one specific implementation, the viscosity modifier includes any one of perfluorooctanoic acid, long-chain fatty acid esters, animal fats, and polymethyl methacrylates.

[0023] By adopting the above technical solutions, perfluorooctanoic acid, long-chain fatty acid esters, animal fats, and polymethyl methacrylates can all play a role in adjusting the viscosity of lubricating oil. As a preferred option, in addition to acting as a viscosity modifier, polymethyl methacrylates also have good thermal stability and can maintain its performance for a relatively long time in high temperature and high humidity environments.

[0024] In one specific implementation, the antifoaming agent includes any one of phosphate esters, dimethyl silicone oil, borates, and silicates.

[0025] In one specific implementation, the antifoaming agent is selected from polydimethylsiloxane with a degree of polymerization of 40 to 60.

[0026] By adopting the above technical solutions, phosphate esters, dimethyl silicone oil, borates, silicates and polydimethylsiloxane can all play the role of defoaming and anti-foaming. As a preferred option, polydimethylsiloxane not only has the advantages of low surface tension and excellent anti-foaming ability, but also has good high temperature resistance and chemical stability, and can maintain its performance for a relatively long time in high temperature and high humidity environments.

[0027] In one specific implementation scheme, the rust inhibitor includes any one of organic carboxylic acid rust inhibitors, sulfonic acid rust inhibitors, oxidized wax esters, and barium dinonylnaphthalene sulfonate.

[0028] Secondly, this application provides a method for preparing an antioxidant lubricating oil, which adopts the following technical solution:

[0029] The preparation method of antioxidant lubricating oil includes the following steps:

[0030] 1. Weigh the vegetable base oil according to the weight parts and pre-treat the vegetable oil, including decolorization, deodorization and dehydration; after heat treatment and refining, the pre-treated vegetable base oil is used to obtain the base oil for later use.

[0031] 2. Weigh out the antioxidant, rust inhibitor, and antifoaming agent by weight, and mix them with the spare base oil in a water-free and dust-free environment. The mixing rate should be controlled at 100-300 r / min, the mixing time should be 3-5 h, and the temperature should be controlled at 25-40℃.

[0032] 3. Weigh the viscosity modifier and mix it with the prepared base oil according to the weight ratio. Maintain the mixing rate, mixing time and temperature of step 2, continue mixing for 0.5 to 1 hour and filter to obtain the antioxidant lubricating oil.

[0033] In summary, this application has the following beneficial effects:

[0034] 1. The antioxidants used in this application are p-diisooctyl diphenylamine, metal passivators, thiophosphates, and thiols, which greatly improve the antioxidant performance of the lubricating oil from the perspectives of inhibiting the generation of free radicals and consuming the free radicals that have already been generated. This optimizes the problem of lubricating oils being unable to provide stable lubrication in some lubrication operations with high humidity and long equipment operating cycles in related technologies.

[0035] 2. The base oils used in this application are all vegetable-based base oils such as olive oil, castor oil, soybean oil, and rapeseed oil, which are more environmentally friendly. In addition, the vegetable oils used in this application generally have higher flash points, which improves the safety of the lubricant during production, storage, and transportation.

[0036] 3. The vegetable base oil used in this application is preferably modified palm oil, and the processing technology of palm oil is provided, which greatly reduces the β-H content in the palm oil molecule and increases the saturation of the lubricant's own structure, thereby making the lubricant have better antioxidant properties.

[0037] 4. The antifoaming agent and viscosity modifier in this application are preferably substances with excellent high-temperature resistance and chemical stability, which further increases the oxidation resistance of the lubricating oil in this application. Detailed Implementation

[0038] The present application will be further described in detail below with reference to the embodiments. All raw materials involved in this application are commercially available.

[0039] Example

[0040] The solution of this application will be further described below with reference to specific embodiments.

[0041] Preparation example: Modification preparation example of palm oil

[0042] I. Hydrolysis

[0043] Palm oil, water and sodium carbonate were mixed in a weight ratio of 80:10:1 and hydrolyzed thoroughly for 2 hours.

[0044] II. Saponification

[0045] The hydrolysis product obtained in step one was mixed with ethanol at a weight ratio of 1:1 and saponified under the condition of controlling the pH to 5 with acetic acid.

[0046] III. Epoxidation

[0047] The product after saponification in step two was oxidized under acidic conditions using hydrogen peroxide with a volume fraction of 20% to obtain modified palm oil containing epoxy alcohol esters.

[0048] In step three above, the pH of the system can be 3 to 4. In this preparation example, the pH is 3. The palm oil used in step one contains 47.6% palmitic acid, 3.7% stearic acid, and 33.4% oleic acid.

[0049] Example 1

[0050] This embodiment provides an antioxidant lubricating oil, the preparation method of which includes the following steps:

[0051] 1. Weigh 80g of vegetable base oil and pre-treat the vegetable oil by successively decolorizing, deodorizing, and dehydrating it; then heat and refine the pre-treated vegetable base oil to obtain a standby base oil.

[0052] 2. Weigh out 3g of antioxidant, 2g of rust inhibitor and 2g of antifoaming agent, and mix them with the spare base oil in a water-free and dust-free environment. The mixing conditions are: mixing rate 100r / min, mixing time 3h, and temperature control 25℃.

[0053] 3. Weigh 6g of viscosity modifier and mix it with the prepared base oil from step 2. Maintain the mixing conditions from step 2, continue mixing for 0.5h, and then filter to obtain antioxidant lubricating oil.

[0054] It should be noted that in this embodiment, the vegetable base oil is olive oil, with a monounsaturated fatty acid content of 71.2%; the antioxidant is a compound of 40wt% p-diisooctyl diphenylamine, 20wt% metal passivator, 5wt% thiophosphate, and 35wt% mercaptan; the rust inhibitor is an organic carboxylic acid rust inhibitor, specifically a tricarboxylic acid rust inhibitor; the antifoaming agent is monophosphate; the viscosity modifier is perfluorooctanoic acid; and the thiosulfate is O,O-diethyl-O-(2-chloro-4-bromophenyl)thiophosphate.

[0055] The vegetable oil pretreatment process involved in step one of this embodiment is already quite mature in the prior art, and will not be described in detail in this embodiment.

[0056] Example 2

[0057] This embodiment provides an antioxidant lubricating oil, the preparation method of which includes the following steps:

[0058] 1. Weigh 84g of vegetable base oil and pre-treat the vegetable oil by successively decolorizing, deodorizing, and dehydrating it; then heat and refine the pre-treated vegetable base oil to obtain a standby base oil.

[0059] 2. Weigh out 5g of antioxidant, 4g of rust inhibitor and 4g of antifoaming agent, and mix them with the spare base oil in a water-free and dust-free environment. The mixing conditions are: mixing rate 200r / min, mixing time 4h, and temperature control 32℃.

[0060] 3. Weigh 8g of viscosity modifier and mix it with the prepared base oil from step 2. Maintain the mixing conditions from step 2 and continue mixing for 0.75h. After filtration, an antioxidant lubricating oil is obtained.

[0061] The specific substances and types of each additive in this embodiment are the same as those in Example 1.

[0062] Example 3

[0063] This embodiment provides an antioxidant lubricating oil, the preparation method of which includes the following steps:

[0064] 1. Weigh 90g of vegetable base oil and pre-treat the vegetable oil by successively decolorizing, deodorizing, and dehydrating it; then heat and refine the pre-treated vegetable base oil to obtain a standby base oil.

[0065] 2. Weigh out 6g of antioxidant, 5g of rust inhibitor and 5g of antifoaming agent, and mix them with the spare base oil in a water-free and dust-free environment. The mixing conditions are: mixing rate 300r / min, mixing time 5h, and temperature control 40℃.

[0066] 3. Weigh 10g of viscosity modifier and mix it with the prepared base oil from step 2. Maintain the mixing conditions from step 2, continue mixing for 1 hour, and then filter to obtain the antioxidant lubricating oil.

[0067] The specific substances and types of each additive in this embodiment are the same as those in Example 1.

[0068] Examples 4-7

[0069] As shown in Table 1, the only difference between Examples 4-7 and Example 2 is the type of additives used. Specifically, the polymethacrylate used in Examples 6 and 7 has an average degree of polymerization of 2700. The organic carboxylic acid rust inhibitor used in Example 4 is the tricarboxylic acid rust inhibitor CP-65. The sulfonic acid rust inhibitor used in Example 5 is calcium sulfonate. The oxidized wax ester used in Example 6 is TLOY2108.

[0070] Table 1:

[0071] sample Viscosity modifier Antifoaming agent Rust inhibitor Example 4 Long-chain fatty acid esters Dimethyl silicone oil Organic carboxylic acid rust inhibitors Example 5 Animal fat (fish oil) Dimethyl silicone oil Sulfonic acid rust inhibitors Example 6 polymethyl methacrylate Sodium borate Oxidized wax esters Example 7 polymethyl methacrylate Sodium silicate Barium dinonylnaphthalenesulfonate

[0072] Example 8

[0073] The only difference between Example 8 and Example 7 is that the antifoaming agent used in Example 8 is polydimethylsiloxane with a degree of polymerization of 40 to 60.

[0074] Examples 9-11

[0075] The difference between Examples 9-11 and Example 8 lies in the different contents of each component of the antioxidant, as shown in Table 2.

[0076] Table 2:

[0077]

[0078] Examples 12-15

[0079] The difference between Examples 12-15 and Example 10 lies in the type of vegetable base oil used, as shown in Table 3. The modified palm oil in Example 15 was prepared using the preparation example.

[0080] Table 3:

[0081] sample Vegetable base oil Example 12 Castor oil (containing 81.4% ricinoleic acid and 7% oleic acid) Example 13 Soybean oil (containing 53.7% linoleic acid and 24.5% oleic acid) Example 14 Rapeseed oil (contains 43.1% erucic acid and 21.9% oleic acid) Example 15 Modified palm oil

[0082] Comparative Example

[0083] Comparative Example 1

[0084] Compared with Example 1, this comparative example lacks p-diisooctyldiphenylamine in its components.

[0085] Comparative Example 2

[0086] Compared with Example 1, this comparative example lacks a metal passivating agent in its composition.

[0087] Comparative Example 3

[0088] Compared with Example 1, this comparative example lacks thiosulfate in its components.

[0089] Comparative Example 4

[0090] Compared with Example 1, this comparative example lacks thiols in its components.

[0091] It should be noted that:

[0092] The metal inhibitor provided in this application aims to reduce the catalytic effect of interfacial metals and can be any one of sodium phosphate, potassium phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate, silicon dioxide, aluminum oxide, phenol, sodium nitrite, sodium thiosulfate, potassium thiosulfate, and ethylenediamine. In the above embodiments and comparative examples, the metal inhibitor is sodium thiosulfate.

[0093] The thiol in this application can be methanethiol, ethanethiol, propanethiol, butanethiol, benzylthiol, or methylpropylthiol. In the above embodiments and comparative examples, the thiol is methylpropylthiol.

[0094] The long-chain fatty acid esters in this application can be ethyl stearate, ethyl oleate, ethyl linoleate, ethyl arachidate, etc. In the above embodiments and comparative examples, the long-chain fatty acid ester selected is ethyl stearate.

[0095] The animal fats used in this application may also be tallow, lard, etc.

[0096] The phosphate ester in this application can also be a phosphate diester, phosphate triester, etc.

[0097] The sulfonic acid rust inhibitors in this application may also be sodium sulfonate, barium sulfonate, barium petroleum sulfonate, or sodium petroleum sulfonate.

[0098] Performance testing experiment

[0099] Oxidation stability performance: Referring to SH / T 0193 "Test method for oxidation stability of lubricating oil", the oxidation stability performance of the oil at different oil bath temperatures (°C) was determined using a fully automatic rotating oxygen bomb tester. The bomb oxygen time (min) was recorded in Table 4.

[0100] Table 4

[0101]

[0102]

[0103] Results Analysis

[0104] Based on the differences between the various embodiments and comparative examples, and the detection results in Table 4, the following conclusions can be drawn:

[0105] ① The oxygenation time of Examples 1 to 3 is better than that of Comparative Examples 1 to 4, with the oxygenation time of Example 2 being the best.

[0106] ② The oxygenation time of Examples 4 to 7 is better than that of Example 2, with Examples 6 and 7 being superior.

[0107] ③The oxygenation time of Example 8 is better than that of Example 7.

[0108] ④ The oxygenation time of Examples 9 to 11 is better than that of Example 8, with Example 10 being the best.

[0109] ⑤ The oxygenation time of Examples 12-14 is not much different from that of Example 10, while the oxygenation time of Example 15 is significantly longer than that of Example 10.

[0110] Regarding ①: This is because in Examples 1 to 3, the antioxidant is a compound of 40wt% p-diisooctyl diphenylamine, 20wt% metal passivator, 5wt% thiophosphate, and 35wt% mercaptan. The above four antioxidants have a synergistic effect. The specific mechanism may be as follows: First, as is common knowledge, the oxidation process of lubricating oil is a free radical reaction. That is, the organic matter in the lubricating oil generates highly active free radicals under certain humidity, temperature and oxidant conditions, thereby changing its own structure and properties, and thus affecting the performance of the lubricating oil.

[0111] The antioxidant mechanism of p-diisooctyl diphenylamine: p-Diisooctyl diphenylamine is a common phenolic antioxidant, and its antioxidant mechanism mainly includes two aspects. First, it can inhibit the generation of free radicals during the oxidation process of lubricating oil. Specifically, it can react with free radicals before they attack lubricating oil molecules, stabilizing them by taking electrons from them, thereby preventing further reactions. Second, p-diisooctyl diphenylamine can also slow down the rate of oxidation. Its mechanism of action may be by introducing new, more stable free radicals into the lubricating oil molecules, thereby reducing the rate of oxidation. The antioxidant mechanism of metal passivators: Their main function may be to inhibit or passivate metals at the interface of the lubricating oil, especially more reactive metals such as iron and copper. In the presence of water and oxygen, these metals accelerate the oxidation process of the lubricating oil at the interface. By passivating these metal catalysts, the oxidation rate of the lubricating oil can be slowed down or prevented. Without these antioxidants, the oxidation rate of lubricating oil may be significantly accelerated by the action of metal catalysts. Thiophosphates: Through the reaction of their sulfur atoms with oxidizing free radicals, they generate stable sulfur free radicals, thereby preventing further reactions. Without thiophosphates, the already generated oxidizing free radicals may continue to trigger more oxidation reactions, leading to a deeper degree of oxidation in the lubricating oil. Thiols: By reacting with free radicals, they terminate chain reactions and form stable organic free radicals, preventing further oxidation. Furthermore, thiols can further prevent and mitigate oxidation by reducing the interfacial tension of the lubricating oil surface, improving its penetration and ability to wash away oxidation products. Therefore, the absence of any one of these four antioxidants will cause the lubricating oil to lose its antioxidant mechanism at a certain level, macroscopically reflected in the poorer elastic-oxidation time test results of proportions 1-3.

[0112] The superior elastic-oxygenation time in Example 2 may be due to the more reasonable proportions of the components, preparation conditions, or operating procedures during the preparation process of Example 2.

[0113] Regarding ②: The elastic-oxygenation time of Examples 4 and 5 did not differ significantly from the test results of Example 2. This indicates that the long-chain fatty acid esters, animal fats and other viscosity modifiers, dimethyl silicone oil and other antifoaming agents, organic carboxylic acid rust inhibitors and sulfonic acid rust inhibitors provided in this application can all play a good role. Among them, the test results of Examples 6 and 7 are even better. This may be because the viscosity modifier selected in Examples 6 and 7 is polymethyl methacrylate. In addition to playing the role of viscosity modifier, polymethyl methacrylate also has good thermal stability and can maintain its performance for a relatively long time in high temperature and high humidity environments. Therefore, Examples 6 and 7 have better elastic-oxygenation time.

[0114] Regarding point ③: In Example 8, the antifoaming agent selected is polydimethylsiloxane with a degree of polymerization of 40-60. Polydimethylsiloxane has the advantages of low surface tension and excellent antifoaming ability, which can play a good antifoaming role. At the same time, it also has good high temperature resistance and chemical stability, and can maintain its performance for a relatively long time in high temperature and high humidity environments. It is also possible that polydimethylsiloxane interacts with other components in the composition [such as O,O-diethyl-O-(2-chloro-4-bromophenyl)thiophosphate], thereby increasing the antioxidant capacity of the system. Based on the above reasons, the elastic-oxygen properties of Example 8 are more superior.

[0115] Regarding point ④: This may be because the ratio of the four antioxidants in Example 10 is more reasonable, making it easier to exert a synergistic antioxidant effect.

[0116] Regarding point ⑤: The vegetable-based base oil used in Example 15 is palm oil prepared in the preparation example. This significantly reduces the β-H content in the palm oil molecule, increases the saturation of the lubricant's own structure, and thus gives the lubricant superior antioxidant properties. Therefore, Example 15 exhibits superior elastic-oxygen properties. It also demonstrates that the vegetable-based base oils used in this application, such as castor oil, soybean oil, and rapeseed oil, all possess high elastic-oxygen properties. Furthermore, the high flash point of vegetable-based base oils ensures the safety of the lubricant during transportation, storage, and use.

[0117] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. An antioxidant lubricating oil, characterized in that, It consists of the following components in parts by weight: 80-90 parts of vegetable base oil and molding additives; Molding additives include 3-6 parts antioxidant, 6-10 parts viscosity modifier, 2-5 parts antifoaming agent, and 2-5 parts rust inhibitor; The antioxidants include 40-60 wt% p-diisooctyl diphenylamine, 20-30 wt% metal passivating agent, 5-8 wt% thiophosphate, and the balance being thiols; The vegetable base oil is olive oil, castor oil, soybean oil, rapeseed oil, or modified palm oil.

2. The antioxidant lubricating oil according to claim 1, characterized in that, It includes the following components by weight: 84 parts of vegetable base oil and molding additives; The molding additives include 5 parts antioxidant, 8 parts viscosity modifier, 4 parts antifoaming agent, and 4 parts rust inhibitor; The antioxidants include 51 wt% p-diisooctyl diphenylamine, 26 wt% metal passivator, 7 wt% thiophosphate, and 16 wt% thiols; The vegetable base oil is olive oil, castor oil, soybean oil, rapeseed oil, or modified palm oil.

3. The antioxidant lubricating oil according to claim 1 or 2, characterized in that: The modification process of the palm oil includes the following steps:

1. Hydrolysis: Mix palm oil, water, and sodium carbonate, and hydrolyze completely; II. Saponification: The hydrolysis product from step one is mixed with alcohol and saponified at pH 5.

3. Epoxidation: The saponification product from step 2 is oxidized under acidic conditions using an oxidizing agent to obtain modified palm oil containing epoxy alcohol esters.

4. The antioxidant lubricating oil according to claim 1 or 2, characterized in that: The viscosity modifier includes any one of perfluorooctanoic acid, long-chain fatty acid esters, animal fats, and polymethyl methacrylates.

5. The antioxidant lubricating oil according to claim 1 or 2, characterized in that: The antifoaming agent includes any one of phosphate esters, dimethyl silicone oil, borates, and silicates.

6. The antioxidant lubricating oil according to claim 1 or 2, characterized in that: The antifoaming agent is selected from polydimethylsiloxane with a degree of polymerization of 40-60.

7. The antioxidant lubricating oil according to claim 1 or 2, characterized in that: The rust inhibitor includes any one of organic carboxylic acid rust inhibitors, sulfonic acid rust inhibitors, and oxidized wax esters.

8. The method for preparing the antioxidant lubricating oil according to any one of claims 1 to 7, characterized in that, The steps include the following: I. Pretreatment Weigh out the vegetable base oils by weight and pre-treat them, including decolorization, deodorization, and dehydration. After heat treatment and refining, the pre-treated vegetable base oils are used to obtain the base oils for later use. II. One-step mixing Weigh out the antioxidant, rust inhibitor, and antifoaming agent by weight, and mix them with the spare base oil in a water-free and dust-free environment. The mixing rate is controlled at 100~300 r / min, the mixing time is 3~5 h, and the temperature is controlled at 25~40℃. Three-step mixing Weigh the viscosity modifier and mix it with the prepared base oil according to the weight ratio. Maintain the mixing rate, mixing time and temperature of step two, continue mixing for 0.5~1h and filter to obtain the antioxidant lubricating oil.

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