A composite diesel anti-wear agent and a preparation method thereof

Abstract

The application belongs to the technical field of diesel anti-wear agents, and specifically provides a composite diesel anti-wear agent and a preparation method thereof, and a preparation method of the composite diesel anti-wear agent, which is obtained by mixing and treating fatty acid ester, base oil, Fischer-Tropsch wax, squalene and tocopherol acetate; the preparation steps comprise the following: S01. mixing the base oil and the Fischer-Tropsch wax, heating to complete dissolution of the Fischer-Tropsch wax under a nitrogen atmosphere to obtain a first mixture; S02. adding the fatty acid ester, the squalene and the tocopherol acetate to the first mixture, stirring and uniformly mixing to obtain a second mixture; S03. supplementing the base oil to the second mixture, continuing to stir and then cooling to room temperature to obtain the composite diesel anti-wear agent. The composite diesel anti-wear agent prepared in the application has good emulsion resistance and wear resistance.

Description

Technical Field

[0001] This application belongs to the field of diesel anti-wear agent technology, and in particular relates to a composite diesel anti-wear agent and its preparation method. Background Technology

[0002] Diesel anti-wear additives are a class of key additives that improve the lubrication performance of diesel fuel. They are mainly used to protect precision components such as high-pressure fuel pumps and fuel injectors in the engine fuel system, thereby reducing wear and extending service life.

[0003] The core working principle of diesel anti-wear additives is to form a dense and stable lubricating film on the metal surfaces of precision components in the engine fuel system. When the components are in motion, this lubricating film effectively isolates the metal contact surfaces, reducing direct friction and collision between metals, thereby reducing the wear rate of components, extending their service life, and improving the operational stability of the fuel system.

[0004] Based on their chemical structure, diesel anti-wear agents are mainly divided into two categories: ester-type and acid-type. Acid-type anti-wear agents have high acid values, which easily corrode metal parts, limiting their application; while ester-type anti-wear agents have low acid values ​​and good stability, effectively resisting wear while avoiding corrosion, and have become the mainstream development direction. Despite the many advantages of ester-type anti-wear agents, a prominent technical challenge remains in practical applications—emulsification. Because ester-type anti-wear agents contain polar groups in their molecular structure, they possess a certain degree of hydrophilicity. Since a small amount of water inevitably remains in the cylinders of diesel engines, ester-type anti-wear agents interact with this residual water to form a stable oil-water emulsion. Once this emulsion enters the fuel system, it disrupts the integrity of the lubrication film, reduces lubrication effectiveness, and may also clog fuel lines, affect fuel injection accuracy, and even cause component corrosion, seriously threatening the normal operation of the engine. The current mainstream solution to the emulsification problem of ester-type anti-wear agents is to add exogenous demulsifiers to the diesel fuel. Demulsifiers can disrupt the stable structure of oil-water emulsions, promote the rapid separation of the oil and water phases, thereby reducing the risk of ester-type anti-wear agents forming emulsions with residual water, ensuring the normal performance of the anti-wear properties of ester-type anti-wear agents, and preventing emulsions from adversely affecting the diesel engine fuel system.

[0005] Although exogenous demulsifiers can alleviate oil-water emulsification problems, their effects require a certain amount of time and lack synergistic effects with the anti-wear agent itself, thus limiting their demulsification effectiveness. Therefore, it is necessary to find a composite diesel anti-wear agent that combines good demulsification and anti-wear effects, as well as its preparation method. Summary of the Invention

[0006] To address the aforementioned issues and further improve the demulsification ability of ester-based anti-wear agents while enhancing their anti-wear effect, this application provides a composite diesel anti-wear agent and its preparation method.

[0007] This application first provides a method for preparing a composite diesel anti-wear agent, which involves mixing and treating a mixture of fatty acid esters, base oil, Fischer-Tropsch wax, squalene, and tocopheryl acetate; the preparation steps include the following:

[0008] S01. Mix the base oil with Fischer-Tropsch wax and heat under a nitrogen atmosphere until the Fischer-Tropsch wax is completely dissolved to obtain the first mixture;

[0009] S02. Add fatty acid ester, squalene and tocopheryl acetate to the first mixture, stir and mix evenly to obtain the second mixture;

[0010] S03. Add base oil to the second mixture, continue stirring, and then cool to room temperature to obtain the final product;

[0011] In step S01, the amount of Fischer-Tropsch wax added is 2.3%-2.7% of the base oil mass;

[0012] The base oil is diesel oil.

[0013] By adopting the above technical solution, the Fischer-Tropsch wax dissolved in the base oil is mixed with components such as fatty acid esters. During the cooling process, the Fischer-Tropsch wax crystallizes to form a hydrophobic three-dimensional network structure, which can encapsulate components such as fatty acid esters. At the same time, the fatty acid esters dispersed in the network form a reinforced skeleton with components such as squalene and tocopheryl acetate containing aromatic ring unsaturated hydrocarbon structures. This allows the network skeleton to be partially retained when the base oil is subsequently added. This hydrophobic encapsulation structure can exist stably in the low-temperature environment of the oil tank. By physically isolating and blocking the direct contact between fatty acid esters and water molecules, the emulsification behavior of fatty acid esters is inhibited.

[0014] In step S03, the volume of base oil added is 2.5-3 times the initial volume of base oil added.

[0015] By adopting the above technical solution, a certain amount of base oil is added to pre-disperse the second mixture obtained in step S02, so as to avoid the reduction of anti-wear effect caused by the agglomeration or uneven dispersion of effective components during subsequent use.

[0016] The preparation steps of the fatty acid ester include the following:

[0017] Take oleic acid and glycerol, mix them, add a catalyst and a water-carrying agent, then heat the mixture to catalyze the reaction, monitor the acid value of the system to terminate the reaction, then remove the water-carrying agent by vacuum distillation, and then decolorize after alkali washing and water washing to obtain the product.

[0018] The molar ratio of oleic acid to glycerol used is (1.05-1):(1.1-1.2).

[0019] Preferably, the reaction is terminated by stopping heating when the acid value of the system is below 1 mg KOH / g.

[0020] Furthermore, in step S01, the Fischer-Tropsch wax has a molecular weight of 2000-3000, a melting point of 94.5-96℃, and an ash content of ≤200ppm.

[0021] Furthermore, in step S02, the mass ratio of fatty acid ester, squalene, and tocopheryl acetate used is (0.2-0.3):(0.08-0.15):(0.02-0.05);

[0022] The catalyst is p-toluenesulfonic acid;

[0023] And / or, the water-carrying agent is toluene.

[0024] Preferably, the amount of water-carrying agent used is 50% v / v to 100% v / v.

[0025] By adopting the above technical solution, fatty acid esters are used as the main anti-wear components. The ester groups in their molecules can form chemical adsorption with the metal surface to initially construct the lubricating film substrate. The multi-electron molecular structure of squalene and tocopheryl acetate can form a strong adsorption effect with the metal surface, and through interaction with fatty acid esters, enhance the bonding force between the lubricating film and the metal matrix, and promote the thickening and densification of the lubricating film.

[0026] Furthermore, the decolorization is performed using silica gel or activated carbon.

[0027] This application also provides a composite diesel anti-wear agent, which is prepared by the above-described preparation method.

[0028] Compared with the prior art, this application has the following beneficial effects:

[0029] 1. This application uses fatty acid esters, which are mixed with Fischer-Tropsch wax and other components to obtain a composite diesel anti-wear agent. The three-dimensional network formed by the cooling crystallization of Fischer-Tropsch wax encapsulates the fatty acid esters and other components, constructing a dispersed hydrophobic barrier to prevent the fatty acid esters from directly participating in emulsification and causing diesel turbidity under the action of residual water in the diesel reservoir.

[0030] 2. This application further introduces squalene and tocopheryl acetate as synergistic components into the anti-wear agent system. The two interact with fatty acid esters to strengthen the hydrophobic inclusion structure of Fischer-Tropsch wax. When the inclusion structure enters the metal wear area of ​​the high-temperature oil circuit with diesel fuel, the inclusion structure dissolves under heat, releasing fatty acid esters, squalene and tocopheryl acetate. The synergistic effect of the components can obtain a high-quality lubricating film. Attached Figure Description

[0031] Figure 1 The image shows the FTIR spectrum of the fatty acid esters in this application.

[0032] Figure 2The results are the wear scar diameter test results of the oil samples used in Examples 1-3 and Comparative Examples 1-2 of this application. Detailed Implementation

[0033] To make the inventive objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] When using “including,” “having,” and “contains” as described herein, the intention is to cover non-exclusive inclusion, unless an explicit qualifying term such as “only,” “consisting of,” etc., is used, in which case another component may be added.

[0036] The terms "preferred," "more preferably," "better," and "even better" used in this application refer to embodiments of this application that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this application. That is, in this application, "preferred," "more preferably," "better," and "even better" are merely descriptions of implementations or embodiments with better effects, but do not constitute a limitation on the scope of protection of this application.

[0037] In this application, terms such as "further," "even more," and "particularly" are used for descriptive purposes and to indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0038] In this application, "at least one" means one or more, such as one, two, or more. "Multiple" or "several" means at least two, such as two, three, etc., and "multi-layered" means at least two layers, such as two layers, three layers, etc., unless otherwise explicitly specified. In the description of this application, "several" means at least one, such as one, two, etc., unless otherwise explicitly specified.

[0039] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0040] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, the method comprising steps (a) and (b) indicates that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0041] In this application, "above" or "below" includes the stated number. For example, "below 1" includes 1.

[0042] In this application, room temperature refers to 0~40℃, including but not limited to 10~40℃, or further to 20~30℃.

[0043] A method for preparing a composite diesel anti-wear agent involves mixing and treating a mixture of fatty acid esters, base oil, Fischer-Tropsch wax, squalene, and tocopheryl acetate. The preparation steps include the following:

[0044] S01. Mix the base oil with Fischer-Tropsch wax and heat under a nitrogen atmosphere until the Fischer-Tropsch wax is completely dissolved to obtain the first mixture;

[0045] S02. Add fatty acid ester, squalene and tocopheryl acetate to the first mixture, stir and mix evenly to obtain the second mixture;

[0046] S03. Add base oil to the second mixture, continue stirring, and then cool to room temperature to obtain the final product;

[0047] In step S01, the Fischer-Tropsch wax has a molecular weight of 2000-3000, a melting point of 94.5-96℃, and an ash content of ≤200ppm.

[0048] In step S01, the amount of Fischer-Tropsch wax added is 2.3%-2.7% of the base oil mass;

[0049] In step S02, the mass ratio of fatty acid ester, squalene, and tocopheryl acetate used is (0.2-0.3):(0.08-0.15):(0.02-0.05).

[0050] In step S03, the volume of base oil added is 2.5-3 times the initial volume of base oil added.

[0051] The preparation steps of the fatty acid ester include the following:

[0052] Oleic acid and glycerol are mixed, and a catalyst and a water-carrying agent are added. The mixture is then heated to catalyze the reaction. The reaction is terminated by monitoring the acid value of the system. The water-carrying agent is then removed by vacuum distillation. The mixture is then decolorized after alkali washing and water washing. The molar ratio of oleic acid to glycerol used is (1.05-1):(1.1-1.2).

[0053] The catalyst is p-toluenesulfonic acid;

[0054] And / or, the water-carrying agent is toluene;

[0055] And / or, the decolorization is performed using silica gel or activated carbon;

[0056] The amount of water-carrying agent used is 50% v / v to 100% v / v.

[0057] A composite diesel anti-wear agent is prepared by the above-described preparation method.

[0058] The present application will be further illustrated by the following examples, but these examples do not limit the scope of the present application.

[0059] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in this application, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. All reagents or instruments whose manufacturers are not specified are conventional products that can be purchased commercially. In addition to the specific methods, equipment, and materials used in the embodiments, based on the knowledge of the prior art possessed by one of ordinary skill in the art and the description in this application, any prior art methods, equipment, and materials similar to or equivalent to those described, used, or made by the methods, equipment, and materials in the embodiments of this application may be used to implement this application.

[0060] In this application, the preparation steps of fatty acid esters are as follows:

[0061] Oleic acid and glycerol were mixed at a molar ratio of 1.05:1.1, and then 1% of the total reactants were added as a catalyst, p-toluenesulfonic acid, and 50% v / v toluene. The mixture was then heated to 135°C and refluxed under nitrogen. The reaction was terminated when the acid value of the system was below 1 mg KOH / g. Toluene was then removed by vacuum distillation. The mixture was then washed twice with 5 wt% calcium hydroxide solution and once with water. The inorganic phase was removed by separation, and the mixture was decolorized with activated carbon and filtered to obtain fatty acid esters.

[0062] Example 1

[0063] Take 5 mL of 0# diesel oil and add 2.3% of Fischer-Tropsch wax (molecular weight 2000, melting point 94.5℃, ash content ≤200ppm) by mass. Mix and heat in a water bath to 95℃ under nitrogen atmosphere and reflux. Maintain stirring at 200 r / min until the Fischer-Tropsch wax is completely dissolved. Then add 0.2 g of fatty acid ester, 0.08 g of squalene, and 0.02 g of tocopheryl acetate. Reduce the stirring speed to 100 r / min and stir for 10 min. Then slowly add 2.5 times the volume of 0# diesel oil to the system and continue stirring for 10 min. Finally, allow it to cool naturally at room temperature to obtain the composite diesel anti-wear agent.

[0064] Example 2

[0065] Take 5 mL of 0# diesel oil and add 2.5% of Fischer-Tropsch wax by mass. Heat the mixture in a water bath under a nitrogen atmosphere to 98°C and reflux. Maintain a stirring speed of 300 r / min until the Fischer-Tropsch wax is completely dissolved. Then add 0.25 g of fatty acid ester, 0.1 g of squalene, and 0.03 g of tocopheryl acetate. Reduce the stirring speed to 100 r / min and stir for 20 min. Then slowly add 3 times the volume of 0# diesel oil to the system and continue stirring for 20 min. Finally, allow it to cool naturally at room temperature to obtain the composite diesel anti-wear agent.

[0066] Example 3

[0067] Take 5 mL of 0# diesel oil and add 2.7% of Fischer-Tropsch wax by mass. Heat the mixture to 98°C in a water bath under a nitrogen atmosphere and reflux. Maintain a stirring speed of 300 r / min until the Fischer-Tropsch wax is completely dissolved. Then add 0.3 g of fatty acid ester, 0.15 g of squalene, and 0.05 g of tocopheryl acetate. Reduce the stirring speed to 100 r / min and stir for 20 min. Then slowly add 3 times the volume of 0# diesel oil to the system and continue stirring for 20 min. Finally, allow it to cool naturally at room temperature to obtain the composite diesel anti-wear agent.

[0068] Comparative Example 1

[0069] The difference between this comparative example and Example 1 is that the preparation steps of the composite diesel anti-wear agent are as follows:

[0070] Take 17.5 mL of 0# diesel oil, heat it to 60℃, then add 0.2 g of fatty acid ester, 0.08 g of squalene, 0.02 g of tocopheryl acetate, and 0.005 g of F-86 polyether demulsifier. Reduce the stirring speed to 100 r / min and stir for 10 min. Finally, allow it to cool naturally at room temperature to obtain the composite diesel anti-wear agent.

[0071] Comparative Example 2

[0072] The difference between this comparative example and Example 1 is that the preparation steps of the composite diesel anti-wear agent are as follows:

[0073] Take 5 mL of 0# diesel oil and add 2.5% of Fischer-Tropsch wax by mass. Heat the mixture in a water bath under a nitrogen atmosphere to 95°C and reflux. Maintain a stirring speed of 300 r / min and continue stirring until the Fischer-Tropsch wax is completely dissolved. Then add 0.22 g of fatty acid ester and reduce the stirring speed to 100 r / min and stir for 10 min. After that, slowly add 2.1 times the volume of 0# diesel oil to the system and continue stirring for 20 min. Finally, allow it to cool naturally at room temperature to obtain the composite diesel anti-wear agent.

[0074] Performance testing

[0075] Preparation of oil samples for testing:

[0076] Add the composite diesel anti-wear agent of Examples 1-3 and Comparative Examples 1-2 to 0# diesel fuel according to the amount of 200ppm effective anti-wear component, stir for 10min, and obtain the test oil sample.

[0077] 1. FTIR test

[0078] Fatty acid esters were subjected to FTIR testing, and the test results are as follows: Figure 1 As shown.

[0079] from Figure 1 It can be seen that 1729.59cm in the spectrum -1 The strong absorption peak appearing at this point corresponds to the C=O stretching vibration of the ester group, and is also the original C=O peak of the carboxylic acid in the raw material oleic acid (approximately 1710 cm⁻¹). -1 The ) has disappeared, indicating that the carboxyl group of oleic acid participated in the esterification reaction; 2995.11cm -1 Place

[0080] The peak corresponds to the C=C stretching vibration of the carbon-carbon double bond in the oleic acid molecule, indicating that unsaturated bonds in oleic acid are introduced into the product during the reaction; the peak is located in the 3300~3400 cm⁻¹ range. -1 The strong OH stretching vibration peak in the region is only observed at 3422.40 cm⁻¹ in the product. -1 The weak peak at 1177.58 cm⁻¹ -1 1253.23cm-1 The enhanced CO stretching vibration peak at 2909.24 cm⁻¹ indicates that the hydroxyl group of glycerol participated in esterification to form an ester bond. -1 The absorption peak at that point corresponds to the stretching vibration of the alkyl CH in the long carbon chain, which is also a perfect match with the alkyl chain structure contained in the fatty acid ester, indicating that the fatty acid ester was successfully synthesized.

[0081] 2. Abrasion resistance test

[0082] Oil-based anti-wear agents effectively reduce wear on friction pairs under boundary lubrication by forming a high-strength lubricating protective film or promoting surface repair. In standard tests, the smaller the wear scar diameter, the better the anti-wear effect of the anti-wear agent. Therefore, wear scar size is a direct and crucial quantitative indicator for evaluating the performance of anti-wear agents.

[0083] Oil samples from Examples 1-3 and Comparative Examples 1-2 were used for testing. The diesel wear resistance test was conducted in accordance with the standard SH / T0765-2005 "Evaluation Method of Lubricity of Diesel Oil (High Frequency Reciprocating Tester Method)". The diameter of the steel ball wear scar was measured. The average value of each group was taken after three tests. The test conditions are shown in Table 1.

[0084] Table 1 Abrasion resistance test conditions

[0085]

[0086] The results are as follows Figure 2 As shown.

[0087] Take Examples 1-3 and Comparative Examples 1-2 and combine them. Figure 2 It can be concluded that the wear scar diameter data obtained after testing the oil samples of Examples 1-3 and Comparative Example 1 are quite similar, and all four anti-wear agents can achieve good anti-wear and lubrication effects in the oil. In contrast, the wear scar diameter of Comparative Example 2 is significantly higher, resulting in greater wear on the metal parts. Under the test conditions, the anti-wear agent of Comparative Example 2 does not form a high-quality lubricating film, resulting in poor protection of the metal parts during friction.

[0088] 3. Demulsibility test

[0089] Referring to standard Q / SHCG57-2017 "Technical Requirements for Diesel Anti-wear Agents", 80 mL of oil samples from Examples 1-3 and Comparative Examples 1-2 were mixed with 20 mL of phosphate buffer solution and poured into a graduated cylinder. The cylinder was then stopped and shaken up and down 200 times. The cylinder was then placed on a horizontal table, and the water-oil separation was observed. The volume of the water layer was recorded at t=5 min, 10 min, 15 min, and 30 min. The volume was then calculated using the formula: ;

[0090] The water distribution volume (t) represents the water distribution volume at time t.

[0091] The test results, used to characterize the demulsibility of oil samples, are shown in Table 2.

[0092] Table 2. Demulsibility test results of oil samples used in Examples 1-3 and Comparative Examples 1-2

[0093]

[0094] By comparing Examples 1-3 and Comparative Examples 1-2 with Table 2, it can be concluded that the average recovery percentage of oil-water separation in the Example schemes was close to 79.3% within 5 minutes, indicating that the composite diesel anti-wear agent in the Example schemes could achieve a good demulsification effect. In contrast, after 5 minutes of testing, the recovery percentage of Comparative Example 1 was only 37%, indicating that the demulsification effect of the exogenous polyether demulsifier had a certain time lag. Furthermore, due to the lack of interaction between the demulsifier and the anti-wear agent components, some anti-wear agent molecules were not dispersed by demulsification, resulting in the oil-water separation volume remaining at 19.2 mL after the test. Comparative Example 2, due to the lack of synergistic components with fatty acid esters, had a prolonged oil-water separation recovery time.

[0095] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for preparing a composite diesel anti-wear agent, characterized in that, It is obtained by mixing fatty acid esters, base oils, Fischer-Tropsch wax, squalene, and tocopheryl acetate; the preparation steps include the following: S01. Mix the base oil with Fischer-Tropsch wax and heat under a nitrogen atmosphere until the Fischer-Tropsch wax is completely dissolved to obtain the first mixture; S02. Add fatty acid ester, squalene and tocopherol acetate to the first mixture, stir and mix evenly to obtain the second mixture; the preparation steps of the fatty acid ester include the following: take oleic acid and glycerol, mix them, add catalyst and water-carrying agent, then heat to catalyze the reaction, monitor the acid value of the system to terminate the reaction, then remove the water-carrying agent by vacuum distillation, and then decolorize after alkali washing and water washing to obtain the second mixture; the mass ratio of fatty acid ester, squalene and tocopherol acetate used is (0.2-0.3):(0.08-0.15):(0.02-0.05); S03. Add base oil to the second mixture, continue stirring, and then cool to room temperature to obtain the final product.

2. The method for preparing a composite diesel anti-wear agent according to claim 1, characterized in that, The base oil is diesel oil.

3. The method for preparing a composite diesel anti-wear agent according to claim 1, characterized in that, In step S01, the Fischer-Tropsch wax has a molecular weight of 2000-3000, a melting point of 94.5-96℃, and an ash content of ≤200ppm.

4. The method for preparing a composite diesel anti-wear agent according to claim 1, characterized in that, In step S01, the amount of Fischer-Tropsch wax added is 2.3%-2.7% of the base oil mass.

5. The method for preparing a composite diesel anti-wear agent according to claim 1, characterized in that, In step S03, the volume of base oil added is 2.5-3 times the initial volume of base oil added.

6. The method for preparing a composite diesel anti-wear agent according to claim 1, characterized in that, The molar ratio of oleic acid to glycerol used is (1.05-1):(1.1-1.2).

7. The method for preparing a composite diesel anti-wear agent according to claim 1, characterized in that, The catalyst is p-toluenesulfonic acid; And / or, the water-carrying agent is toluene; And / or, the decolorization is performed using silica gel or activated carbon.

8. A composite diesel anti-wear agent, characterized in that, It is prepared by any one of the preparation methods described in claims 1-7.

Images