Antirust composite lubricating oil and preparation method thereof

Abstract

The present application relates to the technical field of lubricant, disclose a kind of antirust composite lubricating oil and preparation method thereof.The composite lubricating oil prepared by the present application includes the following mass percentage of raw materials: 1-5% anti-wear agent, 2-6% composite rust inhibitor, 0.05-3% antioxidant, and the balance is base oil;It is to use base oil as the main raw material, and various additives are added to further improve the overall performance of lubricating oil;Among them, the composite rust inhibitor utilizes the synergistic effect between rust inhibitor and corrosion inhibitor, improves the rust-proof performance of lubricating oil;MXene / PDA / MIL-53 composite material is used as anti-wear agent, and the synergistic effect between nanomaterials is utilized, to improve the anti-wear performance of lubricating oil.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lubricating oil, in particular to a kind of rust-proof composite lubricating oil and preparation method thereof. BACKGROUND

[0002] Rust-proof lubricating oil is a kind of protective film formed on the surface of metal, prevent air and moisture from contacting with it, so as to prevent metal parts from rusting, and it can also lubricate the moving parts of metal, reduce wear and save energy. It is mainly composed of base oil and additives, and can be divided into two categories of mineral oil and synthetic oil. The base oil of mineral oil rust-proof oil is extracted from petroleum, and the cost is lower, but its performance is not as good as synthetic oil, and the service life is relatively short, and it is suitable for non-high protection mechanical equipment and metal products. The base oil of synthetic oil rust-proof oil is synthesized by chemical change, and the performance is more durable, and the protection effect on metal is better, and the service life is longer, and it is suitable for high-speed machinery, aircraft, ship and other equipment with high requirements for metal protection.

[0003] The rust-proof performance and wear resistance of lubricating oil are mainly improved by adding additives, but the effect is limited. Among them, the rust-proof agent generally refers to sulfonate and ammonium salt, but the rust-proof effect of single rust-proof agent is limited, and the rust-proof performance can be improved by combining corrosion inhibitor and rust-proof agent to utilize the synergistic effect between them. The addition of wear-resistant agent improves the wear resistance of lubricating agent, and the nanomaterial as lubricating material can improve the tribological performance of base oil. In various types of tribological applications, the shape of nanomaterial plays a crucial role in its lubricating performance and mechanism. Therefore, a kind of composite lubricant with excellent rust-proof performance and wear resistance is developed. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a kind of rust-proof composite lubricating oil and preparation method thereof.

[0005] The purpose of the present application can be realized by the following technical scheme:

[0006] A kind of rust-proof composite lubricating oil, including the following mass percentage of raw materials: 1%-5% wear-resistant agent, 2%-6% composite rust-proof agent, 0.05%-3% antioxidant, and the balance is base oil;

[0007] The wear-resistant agent is MXene / PDA / MIL-53 composite material;

[0008] The base oil is one or more of mineral base oil, synthetic base oil and vegetable oil;

[0009] The composite rust-proof agent is a mixture of heptadecenyl imidazoline alkylene succinate and corrosion inhibitor with a mass ratio of 1:0.5-1.5;

[0010] Further, the corrosion inhibitor is prepared by the following steps:

[0011] Step A1, β-alanine and benzotriazole are added to type A insulating oil, and reacted at 130-160℃ for 6-8h, and then the product is collected after standing and layering, to obtain an intermediate;

[0012] Step A2, the intermediate and sodium hydroxide are dispersed in acetonitrile, denoted as solution 1; 4, 4, 5, 5, 5-pentafluoropentanol and sodium hydroxide are dispersed in acetonitrile, denoted as solution 2; cyanuric chloride and acetonitrile are mixed uniformly in an ice water bath, 1 / 2 volume of mixed solution 1 is slowly added, and reacted at 0℃ for 2-4h, then the remaining volume of mixed solution 1 is slowly added, and reacted at 45-55℃ for 3-5h, then the temperature is increased to 90℃, mixed solution 2 is slowly added, and the reaction is continued for 8-10h, then the product is collected after filtration, washing and drying, to obtain the corrosion inhibitor;

[0013] Further, the amount ratio of β-alanine, benzotriazole and type A insulating oil in step A1 is 0.05-0.15mol: 0.06-0.18mol: 200mL;

[0014] Further, the amount ratio of cyanuric chloride, acetonitrile, mixed solution 1 and mixed solution 2 in step A2 is 0.01-0.03mol: 100mL: 100mL: 50mL;

[0015] Further, the amount ratio of the intermediate, sodium hydroxide and acetonitrile in mixed solution 1 in step A2 is 0.02-0.06mol: 1-3g: 100mL, and the amount ratio of 4, 4, 5, 5, 5-pentafluoropentanol, sodium hydroxide and acetonitrile in mixed solution 2 is 0.01-0.03mol: 0.5-1.5g: 50mL.

[0016] The MXene / PDA / MIL-53 composite material is prepared by the following steps:

[0017] Step B1, LiF and 9mol / L hydrochloric acid solution are mixed uniformly, then Ti3AlC2 powder is added, and the temperature is increased to 35℃ for stirring reaction for 12-24h, then the product is collected after centrifugation, washing until the pH of the supernatant is 6.5-7, and re-dispersing in deionized water, ultrasonic treatment for 1-3h, centrifugation and freeze-drying, to obtain MXene nanosheets;

[0018] Step B2, the MXene nanosheets are ultrasonically dispersed in Tris-HCl buffer solution with pH of 8.5 for 30min, then dopamine hydrochloride is added, and the mixture is stirred at room temperature for 10-20h, then the product is collected after centrifugation, washing and drying, to obtain MXene / PDA powder;

[0019] Step B3, disperse 2-amino terephthalic acid in DMF, and record as a mixed solution; ultrasonic disperse MXene / PDA powder in deionized water, add aluminum chloride trihydrate, stir for 30 min, then add the mixed solution and stir for 30 min, then transfer to a reaction kettle and react at 130-150 DEG C for 10-24 h, centrifugal, washing, drying, and then MXene / PDA / MIL-53 composite material is obtained;

[0020] Further, the amount ratio of Ti3AlC2 powder, LiF, hydrochloric acid solution and deionized water in step B1 is 1-3 g: 1-2 g: 40-80 mL: 10 mL;

[0021] Further, the amount ratio of MXene nanosheet, Tris-HCl buffer solution and dopamine hydrochloride in step B2 is 1-3 g: 200 mL: 0.5-2 g;

[0022] Further, the amount ratio of MXene / PDA powder, deionized water, aluminum chloride trihydrate and mixed solution in step B3 is 0.5-2 g: 20 mL: 0.72-2.16 g: 80 mL, and the amount ratio of 2-amino terephthalic acid and DMF in the mixed solution is 0.54-1.62 g: 80 mL.

[0023] A preparation method of a rust-proof composite lubricating oil comprises the following steps:

[0024] According to the mass percentage, the raw materials are weighed, the base oil is heated to 60-80 DEG C, and then the anti-wear agent, the composite rust-proof agent and the antioxidant are added while stirring, and then the composite lubricating oil is obtained.

[0025] The beneficial effects of the present application are:

[0026] The composite lubricating oil prepared by the present application is prepared by taking base oil as the main raw material and adding various additives to further improve the overall performance of the lubricating oil; wherein the composite rust-proof agent utilizes the synergistic effect between the rust-proof agent and the corrosion inhibitor to improve the rust-proof performance of the lubricating agent; the MXene / PDA / MIL-53 composite material is used as the anti-wear agent, and the synergistic effect between the nanomaterials is utilized to improve the anti-wear performance of the lubricating agent.

[0027] The composite rust inhibitor is obtained by blending heptadecenylimidazoline alkylene succinate and corrosion inhibitor, and the rustproof performance of the lubricant is improved by the synergistic effect of the two. In the corrosion inhibitor, the intermediate is synthesized by the reaction of the carboxyl group in beta-alanine and the secondary amine in benzotriazole, and then the intermediate is reacted with the amino group and hydroxyl group in 4, 4, 5, 5, 5-pentafluoropentanol and cyanuric chloride. The benzotriazole and triazine structure in the corrosion inhibitor can synergistically coordinate with the metal surface atoms to form a covalent bond, prevent the metal from reacting with the corrosion medium, inhibit the corrosion of the metal, and effectively improve the rustproof performance of the lubricant. In addition, the introduction of hydrophobic fluorine atoms can reduce the surface energy of the metal surface, form a hydrophobic layer, further protect the metal substrate, play a corrosion inhibition role, and further improve the rustproof performance.

[0028] In the MXene / PDA / MIL-53 composite material, the Ti3AlC2 powder is etched by hydrochloric acid and LiF to obtain a few-layer MXene nanosheet; then, the self-polymerization of dopamine is used to form a polydopamine film on the surface of the MXene nanosheet to obtain MXene / PDA powder; finally, MIL-53 is synthesized on the surface of the MXene / PDA by using aluminum chloride hexahydrate and 2-amino terephthalic acid as raw materials to obtain the MXene / PDA / MIL-53 composite material. As a lubricating oil additive, the MXene / PDA / MIL-53 composite material has stable dispersibility in base oil and improves the friction reduction and wear resistance of the lubricating oil, which is due to the synergistic effect of the MXene / PDA nanomaterial and MIL-53 in the friction process. The small volume of the MXene nanosheet can easily enter the friction surface and reduce friction loss by interlayer sliding. The MIL-53 material with good flexibility and deformation capacity is grown on the surface of the MXene nanosheet, which weakens the agglomeration of the nanocomposite in the base oil. In the friction process, the MIL-53 falls off and deposits on the wear surface to fill the surface defects, thereby reducing friction and wear. In addition, the nanocomposite may also undergo complex tribochemical reactions to form a friction protection film during the friction process, further improving the wear resistance. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. EMBODIMENT

[0030] The corrosion inhibitor is prepared by the following steps:

[0031] Step A1, 0.05 mol of beta-alanine and 0.06 mol of benzotriazole were added to 200 mL of type A insulating oil, and reacted at 130°C for 6 h, and the lower layer product was collected after standing and layering, i.e. the intermediate was obtained;

[0032] Step A2, 0.02 mol of the intermediate and 1 g of sodium hydroxide were dispersed in 100 mL of acetonitrile, denoted as solution 1; 0.01 mol of 4, 4, 5, 5, 5-pentafluoropentanol and 0.5 g of sodium hydroxide were dispersed in 50 mL of acetonitrile, denoted as solution 2; 0.01 mol of cyanuric chloride and 100 mL of acetonitrile were mixed well in an ice water bath, 50 mL of mixed solution 1 was slowly added, and reacted at 0°C for 2 h, then 50 mL of mixed solution 1 was slowly added, and reacted at 45°C for 3 h, then the temperature was raised to 90°C, 50 mL of mixed solution 2 was slowly added, and the reaction was continued for 8 h, and then the product was obtained by filtration, washing and drying.

[0033] The MXene / PDA / MIL-53 composite material was prepared by the following steps:

[0034] Step B1, 1 g of LiF and 40 mL of 9 mol / L hydrochloric acid solution were mixed well, then 1 g of Ti3AlC2 powder was added, and the temperature was raised to 35°C for stirring reaction for 12 h, and then centrifuged, washed until the supernatant pH was 6.5, the precipitate was collected and redispersed in 10 mL of deionized water, ultrasonicated for 1 h, centrifuged, freeze-dried, and then MXene nanosheets were obtained;

[0035] Step B2, 1 g of MXene nanosheets was ultrasonically dispersed in 200 mL of Tris-HCl buffer solution with pH 8.5 for 30 min, 0.5 g of dopamine hydrochloride was added, and stirred at room temperature for 10 h, then centrifuged, washed and dried, and then MXene / PDA powder was obtained;

[0036] Step B3, 0.54 g of 2-amino terephthalic acid was dispersed in 80 mL of DMF, denoted as mixed solution; 0.5 g of MXene / PDA powder was ultrasonically dispersed in 20 mL of deionized water, 0.72 g of aluminum chloride hexahydrate was added and stirred for 30 min, then 80 mL of mixed solution was added and stirred for 30 min, then transferred to a reaction kettle and reacted at 130°C for 10 h, and then centrifuged, washed and dried, and then MXene / PDA / MIL-53 composite material was obtained. Example

[0037] The corrosion inhibitor was prepared by the following steps:

[0038] Step A1, 0.1 mol of beta-alanine and 0.12 mol of benzotriazole were added to 200 mL of type A insulating oil, and reacted at 140°C for 7 h, and the lower layer product was collected after standing and layering, i.e. the intermediate was obtained;

[0039] Step A2, 0.04 mol of the intermediate and 2 g of sodium hydroxide were dispersed in 100 mL of acetonitrile, denoted as solution 1; 0.02 mol of 4,4,5,5,5-pentafluoropentanol and 1 g of sodium hydroxide were dispersed in 50 mL of acetonitrile, denoted as solution 2; 0.02 mol of cyanuric chloride and 100 mL of acetonitrile were mixed well in an ice water bath, 50 mL of mixed solution 1 was slowly added, and reacted at 0°C for 3 h, then 50 mL of mixed solution 1 was slowly added, and reacted at 50°C for 4 h, then the temperature was raised to 90°C, 50 mL of mixed solution 2 was slowly added, and the reaction was continued for 9 h, then it was filtered, washed, and dried to obtain the corrosion inhibitor.

[0040] The MXene / PDA / MIL-53 composite material was prepared by the following steps:

[0041] Step B1, 1.5 g of LiF and 60 mL of 9 mol / L hydrochloric acid solution were mixed well, then 2 g of Ti3AlC2 powder was added, and the temperature was raised to 35°C for stirring reaction for 18 h, then it was centrifuged, washed until the supernatant pH was 6.7, the precipitate was collected and redispersed in 10 mL of deionized water, ultrasonicated for 2 h, centrifuged, and freeze-dried to obtain MXene nanosheets;

[0042] Step B2, 2 g of MXene nanosheets were ultrasonically dispersed in 200 mL of Tris-HCl buffer solution with pH 8.5 for 30 min, 1 g of dopamine hydrochloride was added, and stirred at room temperature for 15 h, then it was centrifuged, washed, and dried to obtain MXene / PDA powder;

[0043] Step B3, 1.1 g of 2-amino terephthalic acid was dispersed in 80 mL of DMF, denoted as mixed solution; 1 g of MXene / PDA powder was ultrasonically dispersed in 20 mL of deionized water, 1.44 g of aluminum chloride hexahydrate was added and stirred for 30 min, then 80 mL of mixed solution was added and stirred for 30 min, then it was transferred to a reaction kettle and reacted at 40°C for 16 h, then it was centrifuged, washed, and dried to obtain the MXene / PDA / MIL-53 composite material. Example

[0044] The corrosion inhibitor was prepared by the following steps:

[0045] Step A1, 0.15 mol of β-alanine and 0.18 mol of benzotriazole were added to 200 mL of type A insulating oil, and reacted at 160°C for 8 h, then it was allowed to stand and separate into two layers, and the lower layer product was collected to obtain the intermediate;

[0046] Step A2, 0.06 mol of intermediate and 3 g of sodium hydroxide were dispersed in 100 mL of acetonitrile, denoted as solution 1; 0.03 mol of 4, 4, 5, 5, 5-pentafluoropentanol and 1.5 g of sodium hydroxide were dispersed in 50 mL of acetonitrile, denoted as solution 2; 0.03 mol of cyanuric chloride and 100 mL of acetonitrile were mixed well in an ice water bath, 50 mL of mixed solution 1 was slowly added, and reacted at 0℃ for 4h, then 50 mL of mixed solution 1 was slowly added, and reacted at 55℃ for 5h, then the temperature was raised to 90℃, 50 mL of mixed solution 2 was slowly added, and the reaction was continued for 10h, and then filtered, washed and dried to obtain the corrosion inhibitor.

[0047] The MXene / PDA / MIL-53 composite material was prepared by the following steps:

[0048] Step B1, 2 g of LiF and 80 mL of 9 mol / L hydrochloric acid solution were mixed well, then 3 g of Ti3AlC2 powder was added, and the temperature was raised to 35℃ for stirring reaction for 24h, centrifuged, washed until the supernatant pH was 7, the precipitate was collected and redispersed in 10 mL of deionized water, ultrasonicated for 3h, centrifuged and freeze-dried to obtain MXene nanosheets;

[0049] Step B2, 3 g of MXene nanosheets were ultrasonically dispersed in 200 mL of Tris-HCl buffer solution with pH of 8.5 for 30 min, 2 g of dopamine hydrochloride was added, and stirred at room temperature for 20h, then centrifuged, washed and dried to obtain MXene / PDA powder;

[0050] Step B3, 1.62 g of 2-amino terephthalic acid was dispersed in 80 mL of DMF, denoted as mixed solution; 2 g of MXene / PDA powder was ultrasonically dispersed in 20 mL of deionized water, 2.16 g of aluminum chloride hexahydrate was added and stirred for 30 min, then 80 mL of mixed solution was added and stirred for 30 min, then transferred to a reaction kettle and reacted at 150℃ for 24h, then centrifuged, washed and dried to obtain the MXene / PDA / MIL-53 composite material. Example

[0051] A preparation method of a rust-proof composite lubricating oil comprises the following steps:

[0052] 1% of the MXene / PDA / MIL-53 composite material prepared in Example 1, 2% of the composite rust inhibitor, 0.05% of antioxidant 703, and the balance of mineral base oil;

[0053] The composite rust inhibitor is a mixture of heptadecenylimidazoline enyl succinate and the corrosion inhibitor prepared in Example 1 in a mass ratio of 1:0.5;

[0054] The raw materials were weighed according to the mass percentage, the mineral base oil was heated to 60℃, and then the MXene / PDA / MIL-53 composite material prepared in Example 1, the composite rust inhibitor, and the antioxidant 703 were added while stirring to obtain the composite lubricating oil. Example

[0055] A preparation method of a rust-proof composite lubricating oil comprises the following steps:

[0056] 3% of the MXene / PDA / MIL-53 composite material prepared in Example 2, 4% of the composite rust inhibitor, 1% of the antioxidant 703, and the balance of the mineral base oil;

[0057] The composite rust inhibitor is a mixture of heptadecenylimidazoline alkenyl succinate and the corrosion inhibitor prepared in Example 2 in a mass ratio of 1:1;

[0058] The raw materials were weighed according to the mass percentage, the mineral base oil was heated to 70℃, and then the MXene / PDA / MIL-53 composite material prepared in Example 2, the composite rust inhibitor, and the antioxidant 703 were added while stirring to obtain the composite lubricating oil. Example

[0059] A preparation method of a rust-proof composite lubricating oil comprises the following steps:

[0060] 5% of the MXene / PDA / MIL-53 composite material prepared in Example 3, 6% of the composite rust inhibitor, 3% of the antioxidant 703, and the balance of the mineral base oil;

[0061] The composite rust inhibitor is a mixture of heptadecenylimidazoline alkenyl succinate and the corrosion inhibitor prepared in Example 3 in a mass ratio of 1:1.5;

[0062] The raw materials were weighed according to the mass percentage, the mineral base oil was heated to 80℃, and then the MXene / PDA / MIL-53 composite material prepared in Example 3, the composite rust inhibitor, and the antioxidant 703 were added while stirring to obtain the composite lubricating oil.

[0063] Comparative Example 1

[0064] This comparative example is a composite lubricating oil, which is different from Example 6 in that the anti-wear agent SR5088 is used instead of the MXene / PDA / MIL-53 composite material prepared in Example 3, and the rest is the same.

[0065] Comparative Example 2

[0066] This comparative example is a composite lubricating oil, which is different from Example 6 in that only heptadecenylimidazoline alkenyl succinate is used as the composite rust inhibitor, and the rest is the same.

[0067] The prepared examples 4-6 and comparative examples 1-2 were subjected to performance tests:

[0068] Rust-proof performance test: liquid rust test was carried out according to GB / T11143 (B method), and the test conditions were as follows: artificial seawater, time 24 h, water bath temperature 60℃;

[0069] Anti-wear performance test: the anti-wear performance of the lubricating oil was determined according to SH / T0189 method, and the test conditions were as follows: oil temperature 75℃, load 392N, 1200r / min, and running time 60min;

[0070] The test results are shown in the following table:

[0071] Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Rust Results No rust No rust No rust No rust Moderate rust Abrasion diameter / mm 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.32 0.30 0.27 0.52 0.43

[0072] As can be seen from the above table, the composite lubricating oil prepared by the present application has no rust after the rust-proof performance test, indicating that the composite lubricating oil has excellent rust-proof performance; after the anti-wear performance test, the wear scar diameter is in the range of 0.27mm-0.32mm, indicating that it has excellent anti-wear performance.

[0073] The above content is only an example and description of the concept of the present application, and those skilled in the art can make various modifications or supplements or use similar ways to replace the described specific examples, as long as they do not deviate from the scope defined by the concept of the present application, which shall belong to the protection scope of the present application.

Claims

1. A rust-preventive composite lubricating oil, characterized in that, It includes the following raw materials by weight percentage: 1%-5% anti-wear agent, 2%-6% composite rust inhibitor, 0.05%-3% antioxidant, and the balance is base oil; The anti-wear agent is an MXene / PDA / MIL-53 composite material; The composite rust inhibitor is a mixture of heptadecanylimidazolinyl succinate and corrosion inhibitor in a mass ratio of 1:0.5-1.5; The corrosion inhibitor is prepared by the following steps: Step A1: Add β-alanine and benzotriazole to type A insulating oil and react at 130-160℃ for 6-8 hours. Allow the mixture to stand and separate into layers, then collect the lower layer product to obtain the intermediate. Step A2: Disperse the intermediate and sodium hydroxide in acetonitrile, and label it as mixture 1; disperse 4,4,5,5,5-pentafluoropentanol and sodium hydroxide in acetonitrile, and label it as mixture 2; mix cyanuric chloride and acetonitrile evenly in an ice-water bath, slowly add 1 / 2 volume of mixture 1, and react at 0℃ for 2-4 hours, then slowly add the remaining volume of mixture 1, and react at 45-55℃ for 3-5 hours, then raise the temperature to 90℃, slowly add mixture 2, and continue reacting for 8-10 hours. Filter, wash, and dry to obtain the corrosion inhibitor. The MXene / PDA / MIL-53 composite material is prepared by the following steps: Step B1: Mix LiF and 9 mol / L hydrochloric acid solution evenly, then add Ti3AlC2 powder, heat to 35℃ and stir for 12-24 h, centrifuge and wash until the pH of the supernatant is 6.5-7, collect the precipitate, redisperse it in deionized water, sonicate for 1-3 h, centrifuge and freeze dry to obtain MXene nanosheets. Step B2: Disperse MXene nanosheets in Tris-HCl buffer at pH 8.5 by ultrasonication for 30 min, add dopamine hydrochloride, stir at room temperature for 10-20 h, centrifuge, wash, and dry to obtain MXene / PDA powder. Step B3: Disperse 2-aminoterephthalic acid in DMF, and record the mixture as a mixture; ultrasonically disperse MXene / PDA powder in deionized water, add aluminum trichloride hexahydrate and stir for 30 min, then add the mixture and stir for 30 min, then transfer to a reaction vessel and react at 130-150℃ for 10-24 h, centrifuge, wash and dry to obtain the MXene / PDA / MIL-53 composite material.

2. The rust-preventive composite lubricating oil according to claim 1, characterized in that, In step A1, the ratio of β-alanine, benzotriazole, and type A insulating oil is 0.05-0.15 mol: 0.06-0.18 mol: 200 mL.

3. The rust-preventive composite lubricating oil according to claim 1, characterized in that, In step A2, the ratio of cyanuric chloride, acetonitrile, mixture 1 and mixture 2 is 0.01-0.03 mol: 100 mL: 100 mL: 50 mL.

4. The rust-preventive composite lubricating oil according to claim 1, characterized in that, In step A2, the ratio of intermediate, sodium hydroxide, and acetonitrile in mixture 1 is 0.02-0.06 mol: 1-3 g: 100 mL, and the ratio of 4,4,5,5,5-pentafluoropentanol, sodium hydroxide, and acetonitrile in mixture 2 is 0.01-0.03 mol: 0.5-1.5 g: 50 mL.

5. The rust-preventive composite lubricating oil according to claim 1, characterized in that, The base oil is one or more of mineral base oils, synthetic base oils, and vegetable oils.

6. The rust-preventive composite lubricating oil according to claim 1, characterized in that, In step B1, the ratio of Ti3AlC2 powder, LiF, hydrochloric acid solution and deionized water is 1-3g: 1-2g: 40-80mL: 10mL.

7. The rust-preventive composite lubricating oil according to claim 1, characterized in that, In step B2, the ratio of MXene nanosheets, Tris-HCl buffer, and dopamine hydrochloride is 1-3g: 200mL: 0.5-2g.

8. The rust-preventive composite lubricating oil according to claim 1, characterized in that, In step B3, the ratio of MXene / PDA powder, deionized water, aluminum trichloride hexahydrate, and the mixed solution is 0.5-2g:20mL:0.72-2.16g:80mL, and the ratio of 2-aminoterephthalic acid and DMF in the mixed solution is 0.54-1.62g:80mL.

9. A method for preparing the rust-preventive composite lubricating oil according to any one of claims 1-8, characterized in that, Includes the following steps: Weigh the raw materials according to the mass percentage, heat the base oil to 60-80℃, and then add the anti-wear agent, composite rust inhibitor, and antioxidant while stirring to obtain the composite lubricating oil.