Antiwear repairing agent for automobile lubricating oil, preparation method of antiwear repairing agent and lubricating oil

Abstract

The invention relates to the technical field of self-repairing materials, and particularly discloses an anti-wear repairing agent for automobile lubricating oil, a preparation method of the anti-wear repairing agent and the lubricating oil. The anti-wear repairing agent for the lubricating oil for the vehicle comprises the following components in parts by mass: 10-25 parts of an oily solvent, 1-3 parts of dodecyl trimethoxy silane and 30-70 parts of modified hydroxyl magnesium silicate, after the surface of the hydroxyl magnesium silicate is coated with the iron nanoparticles, the interface bonding strength is higher when a friction pair is abraded, so that the local deformation resistance of the iron-based metal is improved, and the wear resistance is improved.

Description

Technical Field

[0001] The present application relates to the technical field of self-repairing materials, and more specifically, to an anti-wear repair agent for automotive lubricating oil, a preparation method thereof, and lubricating oil. Background Art

[0002] As a major energy consumer, energy conservation is crucial for automobiles. Of the heat generated by fuel combustion in an engine, approximately 20-30% of this energy is wasted in the form of friction. Therefore, reducing wear, lowering energy consumption, and significantly extending the life of equipment are becoming increasingly important.

[0003] Lubricating oil is an indispensable component for the operation and maintenance of machinery. With the increasing load, speed, temperature and other operating parameters of modern mechanical equipment, the original friction reducers and anti-wear agents in lubricating oil can no longer fully meet the requirements of its friction reduction and anti-wear performance. In order to make up for the defects of liquid lubricating oil, the method of adding lubricating oil additives is usually adopted to improve the lubrication and anti-wear properties of lubricating oil. For example, the Chinese patent with authorization announcement number CN108977253B discloses a lubricating oil compound additive, its preparation method and lubricating oil. It is prepared from silane coupling agent, graphene and copper nanowires. The copper nanowire and graphene compound system reacts with the surface of the steel ball to form a film layer with good anti-wear and friction reduction properties; at the same time, the layered structure of copper nanowires and graphene can improve the friction reduction and anti-wear properties of the lubricating oil, and even achieve a certain self-repairing effect, which greatly improves the lubrication performance.

[0004] In the field of nano-additives for lubricating oils, most of the added particles are single. Although the performance of lubricating oils has been improved, many advantages of nano-additive particles have not been fully utilized. In recent years, the research on nanoparticle composite additives has received widespread attention. Compound system nanoparticles refer to two or more nanoparticles that are stably and evenly dispersed in lubricants. By utilizing the characteristics and action mechanisms of different particles, the performance of lubricants can be significantly improved. Compound system nanoparticles usually exhibit better tribological properties than single-agent nanoparticles, so the research on compound nanoparticles is of great significance. However, as lubricating oil additives, nanoparticles currently have a single function, agglomerate, and are unevenly dispersed in the base oil, resulting in poor anti-wear and friction reduction effects and an inability to achieve a good lubricating effect. Summary of the Invention

[0005] In order to solve the problem that the above-mentioned existing nanoparticles as lubricant additives have poor anti-wear and friction reduction effects and cannot provide a good lubricating effect, the present application provides an automotive lubricant anti-wear repair agent, a preparation method thereof, and a lubricant.

[0006] In the first aspect, the present application provides an anti-wear repair agent for automotive lubricating oil, which adopts the following technical solution:

[0007] The automotive lubricating oil anti-wear repair agent comprises 10-25 parts by mass of an oily solvent, 1-3 parts by mass of dodecyltrimethoxysilane, and 30-70 parts by mass of modified hydroxy magnesium silicate.

[0008] By adopting the above-mentioned technical solution, the self-healing material currently consists primarily of a complex mineral powder composed primarily of magnesium hydroxysilicate, along with a small amount of catalyst and additives, added to a carrier lubricant. Its unique feature is that it can self-repair worn areas of ferrous metals during operation without disassembling the mechanical device. By generating a metal-ceramic protective layer with excellent friction-reducing properties, it prevents direct contact between the metal surfaces of the friction pair, improving the hardness and smoothness of the friction surface and significantly reducing the coefficient of friction. Furthermore, the self-repair process can be completed on worn areas of ferrous metals during operation, extending the equipment's service life.

[0009] However, the added ore powder and the iron-based metal have weak interfacial bonding during direct contact, resulting in poor wettability between the ore powder and the iron-based metal. After the surface of the magnesium hydroxysilicate is coated with iron nanoparticles, an oxide film forms on the surface of the iron-based metal at high temperatures during friction pair grinding. This increases the interfacial bonding strength with the iron oxide coated with the magnesium hydroxysilicate. As a result, the modified magnesium hydroxysilicate can be firmly embedded in the matrix during grinding between the friction pair and the repair agent, increasing the iron-based metal's resistance to local deformation and improving its wear resistance. The modified magnesium hydroxysilicate is more conducive to improving the wear resistance of iron-based metals.

[0010] Optionally, the preparation method of the modified hydroxy magnesium silicate is: adding hydroxy magnesium silicate and FeCl2 solution to methanol and stirring to obtain a solution; under nitrogen protection, adding NaBH4 solution to the solution; ultrasonicating for 30 minutes; and separating the obtained black precipitate, which is the modified hydroxy magnesium silicate.

[0011] By employing this technical solution, the FeCl₂ solution, in the presence of the reducing agent NaBH₄, forms a layer of ferric oxide nanoparticles on the surface of the magnesium hydroxysilicate. The nanoparticles have a particle size of 200-500 nm. The magnesium hydroxysilicate coating of the iron nanoparticles increases the iron-based metal's resistance to local deformation and improves its wear resistance.

[0012] Optionally, the concentration of the NaBH4 solution is 0.08-0.1 mol / L.

[0013] By employing the above technical solution, a reducing agent, NaBH₄ solution, reduces FeCl₂ to ferric oxide nanoparticles with a particle size of 200-500 nm. Magnesium hydroxysilicate coats the iron nanoparticles, enhancing the iron-based metal's resistance to local deformation and wear resistance. The optimal reducing agent concentration for generating the iron nanoparticles is 0.08-0.1 mol / L. Concentrations exceeding this range result in insufficient iron nanoparticle coating and agglomeration of the nanoparticles, resulting in poor anti-wear performance.

[0014] Optionally, the mass ratio of the magnesium hydroxysilicate, FeCl2 solution and methanol is (5-7):(0.5-1):(30-40).

[0015] By adopting the above technical solution, coating the iron nanoparticles requires adjusting the mass ratio of magnesium hydroxysilicate, FeCl2 solution, and methanol. Below this ratio, the coated iron nanoparticles have a reduced wear-reducing effect. Above this ratio, the iron nanoparticle content is excessive, causing the nanoparticles to agglomerate, resulting in poor anti-wear and wear-reducing effects.

[0016] Optionally, the concentration of the FeCl2 solution is 0.01-0.03 mol / L.

[0017] By adopting the above technical solution, the suitable concentration of FeCl2 solution for generating iron nanoparticles is 0.01-0.03 mol / L. If the concentration exceeds the above range, on the one hand, the coating amount of iron nanoparticles is insufficient; on the other hand, the nanoparticles agglomerate, resulting in poor anti-wear effect.

[0018] Optionally, the oily solvent is mineral oil or synthetic oil.

[0019] By adopting the above technical solution, mineral oil or synthetic oil is used as the oily solvent of the repair agent, which can enhance the compatibility of the repair agent with the lubricating oil body and achieve a good lubricating effect.

[0020] In a second aspect, the present application provides a method for preparing an anti-wear repair agent for automotive lubricating oil, comprising:

[0021] Step 1: Add modified magnesium hydroxysilicate and dodecyltrimethoxysilane to ethanol, stir at 30-45° C. for 1 hour, and dry at 60° C. for 12 hours to obtain the product;

[0022] Step 2: fully stir and mix the product of step 1 and the oily solvent, and heat and keep warm at 35-45° C. for 20-45 minutes to obtain the automotive lubricant anti-wear repair agent.

[0023] By adopting the above technical solution, dodecyltrimethoxysilane is grafted onto the surface of modified magnesium hydroxysilicate, improving the hydrophobicity and lipophilicity of the mineral powder, significantly enhancing its compatibility with lubricating oils and preventing particle agglomeration, which would otherwise reduce the wear-reducing effect.

[0024] Optionally, the mass ratio of the dodecyltrimethoxysilane to ethanol is 1:150.

[0025] By adopting the above technical solution, dodecyltrimethoxysilane is dissolved in ethanol, and dodecyltrimethoxysilane is grafted on the surface of the modified hydroxy magnesium silicate to improve the hydrophobicity and lipophilicity of the modified hydroxy magnesium silicate.

[0026] The present invention discloses a lubricating oil comprising the aforementioned automotive lubricating oil anti-wear repair agent. The modified magnesium silicate hydroxylate and additives can improve the lubricating oil's anti-wear properties, thereby increasing the iron-based metal's resistance to local deformation and enhancing its wear resistance. The modified magnesium silicate hydroxylate further enhances the wear resistance of the iron-based metal.

[0027] In summary, this application has the following beneficial effects:

[0028] 1. A complex mineral powder primarily composed of magnesium hydroxysilicate, along with a small amount of catalyst and additives, is added to a carrier lubricant. Its characteristic is that it can self-repair worn areas of ferrous metals during operation without disassembling the mechanical device. By forming a metal-ceramic protective layer with excellent friction-reducing properties, it prevents direct contact between the metal surfaces of the friction pair, improving the hardness and smoothness of the friction surface and significantly reducing the friction coefficient. Furthermore, it can self-repair worn areas of ferrous metals during operation, extending the equipment's service life.

[0029] However, the added ore powder and the iron-based metal have weak interfacial bonding during direct contact, resulting in poor wettability between the ore powder and the iron-based metal. After the surface of the magnesium hydroxysilicate is coated with iron nanoparticles, an oxide film forms on the surface of the iron-based metal at high temperatures during friction pair grinding. This increases the interfacial bonding strength with the iron oxide coated with the magnesium hydroxysilicate. As a result, the modified magnesium hydroxysilicate can be firmly embedded in the matrix during grinding between the friction pair and the repair agent, increasing the iron-based metal's resistance to local deformation and improving its wear resistance. The modified magnesium hydroxysilicate is more conducive to improving the wear resistance of iron-based metals.

[0030] 2. Dodecyltrimethoxysilane was dissolved in ethanol and grafted onto the surface of the modified hydroxy magnesium silicate to improve the hydrophobicity and lipophilicity of the modified hydroxy magnesium silicate.

[0031] Dodecyltrimethoxysilane is grafted onto the surface of modified magnesium hydroxysilicate to improve the hydrophobicity and lipophilicity of the mineral powder, significantly enhancing its compatibility with lubricants. This prevents particle agglomeration and reduces the wear-reducing effect.

[0032] 3. Under the action of the reducing agent NaBH4, the FeCl2 solution forms a layer of ferric oxide nanoparticles on the surface of the magnesium hydroxysilicate. The nanoparticles have a particle size of 200-500nm. After the magnesium hydroxysilicate is coated with the iron nanoparticles, an oxide film is formed on the surface of the iron-based metal at high temperatures during the friction pair's wear. This increases the interfacial bonding strength between the magnesium hydroxysilicate and the iron oxide coated with the magnesium hydroxysilicate. As a result, when the friction pair and the repair agent are worn against each other, the modified magnesium hydroxysilicate can be firmly embedded in the matrix, increasing the iron-based metal's resistance to local deformation and improving its wear resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a curve showing the change in wear of the automotive lubricant anti-wear repair agent prepared in Example 1 over time. DETAILED DESCRIPTION

[0034] The raw materials of the examples and comparative examples of the present application can all be purchased commercially, wherein the particle size of the magnesium hydroxy silicate is 5-11 μm.

[0035] The present application is further described in detail below with reference to the following examples and comparative examples.

[0036] Preparation Example 1

[0037] Preparation of modified magnesium hydroxysilicate: Dissolve NaBH4 in deionized water to prepare a 0.1 mol / L NaBH4 reducing agent solution. Weigh a certain amount of FeCl2·4H2O and dissolve it in deionized water to prepare a 0.09 mol / L FeCl2 solution as an iron source. Add 6 g of magnesium hydroxysilicate and 0.9 g of FeCl2 solution to 35 g of methanol and stir to obtain a solution. Under nitrogen protection, inject 5 mL of NaBH4 solution into the solution using a syringe pump. Ultrasonicate for 30 minutes. Separate the black precipitate produced by the reaction using a magnet, which is the modified magnesium hydroxysilicate. Rinse the solution with ethanol five times and dry it in a vacuum drying oven for 24 hours. Obtain a modified magnesium hydroxysilicate sample for testing.

[0038] Preparation Example 2

[0039] Preparation of modified magnesium hydroxysilicate: Dissolve NaBH4 in deionized water to prepare a 0.1 mol / L NaBH4 reducing agent solution. Weigh a certain amount of FeCl2·4H2O and dissolve it in deionized water to prepare a 0.08 mol / L FeCl2 solution as an iron source. Add 5 g of magnesium hydroxysilicate and 0.5 g of FeCl2 solution to 30 mL of methanol and stir to obtain a solution. Under nitrogen protection, inject 5 mL of NaBH4 solution into the solution using a syringe pump. Ultrasonicate for 30 minutes. Separate the black precipitate generated by the reaction using a magnet, which is the modified magnesium hydroxysilicate. Rinse the solution with ethanol five times and dry it in a vacuum drying oven for 24 hours. Obtain a modified magnesium hydroxysilicate sample for testing.

[0040] Preparation Example 3

[0041] Preparation of modified magnesium hydroxysilicate: Dissolve NaBH4 in deionized water to prepare a 0.1 mol / L NaBH4 reducing agent solution for later use. Weigh a certain amount of FeCl2·4H2O and dissolve it in deionized water to prepare a 0.1 mol / L FeCl2 solution as an iron source. Add 7g of magnesium hydroxysilicate and 1g of FeCl2 solution to 40mL of methanol and stir to obtain a solution. Under nitrogen protection, inject 5mL of NaBH4 solution into the solution using a syringe pump. Ultrasonicate for 30 minutes, and separate the black precipitate generated by the reaction with a magnet. This is the modified magnesium hydroxysilicate. Resuspend the solution in ethanol five times and dry it in a vacuum drying oven for 24 hours. Obtain a modified magnesium hydroxysilicate sample for testing.

[0042] Comparative Preparation Example 1

[0043] The difference from Preparation Example 1 is that the mass ratio of magnesium silicate hydroxide, FeCl2 solution and methanol is 4:0.4:28.

[0044] Dissolve NaBH4 in deionized water to prepare a 0.1 mol / L NaBH4 reducing agent solution for later use. Weigh a certain amount of FeCl2·4H2O and dissolve it in deionized water to prepare a 0.02 mol / L FeCl2 solution as an iron source. Add 4 g of magnesium hydroxysilicate and 0.4 g of FeCl2 solution to 28 g of methanol and stir to obtain a solution. Under nitrogen protection, inject 5 mL of NaBH4 solution into the solution using a syringe pump. Ultrasonicate for 30 minutes, and separate the black precipitate generated by the reaction with a magnet. This is the modified magnesium hydroxysilicate. Rinse with ethanol five times and dry in a vacuum drying oven for 24 hours. Obtain a modified magnesium hydroxysilicate sample for testing.

[0045] Comparative Preparation Example 2

[0046] The difference from Preparation Example 1 is that the mass ratio of magnesium silicate hydroxide, FeCl2 solution and methanol is 9:1.2:45.

[0047] Dissolve NaBH4 in deionized water to prepare a 0.1 mol / L NaBH4 reducing agent solution for later use. Weigh a certain amount of FeCl2·4H2O and dissolve it in deionized water to prepare a 0.09 mol / L FeCl2 solution as an iron source. Add 9 g of magnesium hydroxysilicate and 1.2 g of FeCl2 solution to 45 mL of methanol and stir to obtain a solution. Under nitrogen protection, inject 5 mL of NaBH4 solution into the solution using a syringe pump. Ultrasonicate for 30 minutes, and separate the black precipitate generated by the reaction with a magnet. This is the modified magnesium hydroxysilicate. Wash it with ethanol five times and dry it in a vacuum drying oven for 24 hours. Obtain a modified magnesium hydroxysilicate sample for testing.

[0048] Comparative Preparation Example 3

[0049] The difference from Preparation Example 1 is that the concentration of the FeCl2 solution is 0.008 mol / L.

[0050] Dissolve NaBH4 in deionized water to prepare a 0.1 mol / L NaBH4 reducing agent solution for later use. Weigh a certain amount of FeCl2·4H2O and dissolve it in deionized water to prepare a 0.008 mol / L FeCl2 solution as an iron source. Add 6 g of magnesium hydroxysilicate and 0.9 g of FeCl2 solution to 35 g of methanol and stir to obtain a solution. Under nitrogen protection, use a syringe pump to inject 5 mL of NaBH4 solution into the solution. Ultrasonicate for 30 minutes, and use a magnet to separate the black precipitate generated by the reaction, which is the modified magnesium hydroxysilicate. Rinse with ethanol five times and dry in a vacuum drying oven for 24 hours. Obtain a modified magnesium hydroxysilicate sample for testing.

[0051] Comparative Preparation Example 4

[0052] The difference from Preparation Example 1 is that the concentration of the FeCl2 solution is 0.04 mol / L.

[0053] Dissolve NaBH4 in deionized water to prepare a 0.1 mol / L NaBH4 reducing agent solution for later use. Weigh a certain amount of FeCl2·4H2O and dissolve it in deionized water to prepare a 0.04 mol / L FeCl2 solution as an iron source. Add 6 g of magnesium hydroxysilicate and 0.9 g of FeCl2 solution to 35 g of methanol and stir to obtain a solution. Under nitrogen protection, use a syringe pump to inject 5 mL of NaBH4 solution into the solution. Ultrasonicate for 30 minutes, and use a magnet to separate the black precipitate generated by the reaction, which is the modified magnesium hydroxysilicate. Rinse with ethanol five times and dry in a vacuum drying oven for 24 hours. Obtain a modified magnesium hydroxysilicate sample for testing.

[0054] Comparative Preparation Example 5

[0055] The difference from Preparation Example 1 is that the concentration of the NaBH4 reducing agent solution is 0.05 mol / L.

[0056] Preparation of modified magnesium hydroxysilicate: Dissolve NaBH4 in deionized water to prepare a 0.05 mol / L NaBH4 reducing agent solution for later use. Weigh a certain amount of FeCl2·4H2O and dissolve it in deionized water to prepare a 0.09 mol / L FeCl2 solution as an iron source. Add 6 g of magnesium hydroxysilicate and 0.9 g of FeCl2 solution to 35 g of methanol and stir to obtain a solution. Under nitrogen protection, inject 5 mL of NaBH4 solution into the solution using a syringe pump. Ultrasonicate for 30 minutes, and separate the black precipitate generated by the reaction using a magnet. Rinse the solution with ethanol five times and dry it in a vacuum drying oven for 24 hours. Obtain a modified magnesium hydroxysilicate sample for testing.

[0057] Comparative Preparation Example 6

[0058] The difference from Preparation Example 1 is that the concentration of the NaBH4 reducing agent solution is 0.2 mol / L.

[0059] Preparation of modified magnesium hydroxysilicate: Dissolve NaBH4 in deionized water to prepare a 0.2 mol / L NaBH4 reducing agent solution. Weigh a certain amount of FeCl2·4H2O and dissolve it in deionized water to prepare a 0.09 mol / L FeCl2 solution as an iron source. Add 6 g of magnesium hydroxysilicate and 0.9 g of FeCl2 solution to 35 g of methanol and stir to obtain a solution. Under nitrogen protection, inject 5 mL of NaBH4 solution into the solution using a syringe pump. Ultrasonicate for 30 minutes. Separate the black precipitate generated by the reaction using a magnet, which is the modified magnesium hydroxysilicate. Rinse the solution with ethanol five times and dry it in a vacuum drying oven for 24 hours. Obtain a modified magnesium hydroxysilicate sample for testing.

[0060] Example 1

[0061] This embodiment provides an anti-wear repair agent for automotive lubricating oil, the preparation method of which includes:

[0062] Step 1: Using the modified hydroxy magnesium silicate prepared in Preparation Example 1, 60 g of the modified hydroxy magnesium silicate and 2 g of dodecyltrimethoxysilane were added to 300 mL of ethanol, stirred at 40 ° C for 1 hour, and then dried in a vacuum drying oven at 60 ° C for 12 hours to obtain a product;

[0063] Step 2: Thoroughly stir and mix the product of step 1 and 20 g of mineral oil, and heat at 40° C. and keep warm for 30 minutes to obtain an automotive lubricant anti-wear repair agent.

[0064] Example 2

[0065] This embodiment provides an anti-wear repair agent for automotive lubricating oil, the preparation method of which includes:

[0066] Step 1: Using the modified hydroxy magnesium silicate prepared in Preparation Example 2, 30 g of the modified hydroxy magnesium silicate and 1 g of dodecyltrimethoxysilane were added to 150 mL of ethanol, stirred at 35 ° C for 1 hour, and then dried in a vacuum drying oven at 60 ° C for 12 hours to obtain a product;

[0067] Step 2: fully stir and mix the product of step 1 and 10 g of mineral oil, and heat at 40° C. and keep warm for 30 minutes to obtain an automotive lubricant anti-wear repair agent.

[0068] Example 3

[0069] This embodiment provides an anti-wear repair agent for automotive lubricating oil, the preparation method of which includes:

[0070] Step 1: Using the modified hydroxy magnesium silicate prepared in Preparation Example 3, 70 g of the modified hydroxy magnesium silicate and 3 g of dodecyltrimethoxysilane were added to 450 mL of ethanol, stirred at 45 ° C for 1 hour, and then dried in a vacuum drying oven at 60 ° C for 12 hours to obtain a product;

[0071] Step 2: Thoroughly stir and mix the product of step 1 and 25 g of mineral oil, and heat at 40° C. and keep warm for 30 minutes to obtain an automotive lubricant anti-wear repair agent.

[0072] Comparative Example 1

[0073] This comparative example provides an anti-wear repair agent for automotive lubricating oil, which is different from Example 1 in that the modified hydroxy magnesium silicate adopts the modified hydroxy magnesium silicate sample prepared in Comparative Preparation Example 1.

[0074] Comparative Example 2

[0075] This comparative example provides an anti-wear repair agent for automotive lubricating oil, which is different from Example 1 in that the modified hydroxy magnesium silicate is the modified hydroxy magnesium silicate sample prepared in Comparative Preparation Example 2.

[0076] Comparative Example 3

[0077] This comparative example provides an anti-wear repair agent for automotive lubricating oil, which is different from Example 1 in that the modified hydroxy magnesium silicate adopts the modified hydroxy magnesium silicate sample prepared in Comparative Preparation Example 3.

[0078] Comparative Example 4

[0079] This comparative example provides an anti-wear repair agent for automotive lubricating oil, which is different from Example 1 in that the modified hydroxy magnesium silicate adopts the modified hydroxy magnesium silicate sample prepared in Comparative Preparation Example 4.

[0080] Comparative Example 5

[0081] Step 1: add 60 g of magnesium hydroxysilicate and 2 g of dodecyltrimethoxysilane to 300 mL of ethanol, stir at 40 ° C for 1 hour, and then dry in a vacuum drying oven at 60 ° C for 12 hours to obtain the product;

[0082] Step 2: Thoroughly stir and mix the product of step 1 and 20 g of mineral oil, and heat at 40° C. and keep warm for 30 minutes to obtain an automotive lubricant anti-wear repair agent.

[0083] Comparative Example 6

[0084] This comparative example provides an anti-wear repair agent for automotive lubricating oil, which is different from Example 1 in that the modified hydroxy magnesium silicate is the modified hydroxy magnesium silicate sample prepared in Comparative Preparation Example 5.

[0085] Comparative Example 7

[0086] This comparative example provides an anti-wear repair agent for automotive lubricating oil, which is different from Example 1 in that the modified hydroxy magnesium silicate is the modified hydroxy magnesium silicate sample prepared in Comparative Preparation Example 6.

[0087] The performance test of the automotive lubricating oil anti-wear repair agent prepared in Examples 1-3 and Comparative Examples 1-7 was carried out:

[0088] The automotive lubricant anti-wear repair agent prepared in the above examples and comparative examples was added to SM10W-40 gasoline engine oil at a ratio of 3% by mass for testing.

[0089] Friction and Wear Test: The automotive lubricant anti-wear repair agents in the embodiments and comparative examples of the present invention were tested using the four-ball method in accordance with GB314-82. The four-ball testing machine used was an MRS-1J, with secondary standard steel balls (GC15 bearings, HRC 59-61), a rotation speed of 1480 rpm, and room temperature.

[0090] The above test results are shown in Table 1.

[0091] Table 1 Performance test results of Examples 1-3 and Comparative Examples 1-7

[0092]

[0093]

[0094] Combining the data of Examples 1-3, it can be seen that the only difference between Examples 1-3 is the different raw material composition ratios. The wear spot diameter of Example 1 is lower than that of Example 2 and Example 3, proving that Example 1 has the highest wear resistance and the best raw material ratio.

[0095] Combining the data of Example 1 with Comparative Examples 1 and 2, it can be seen that Example 1 differs from Comparative Examples 1 and 2 in the mass ratio of magnesium hydroxysilicate, FeCl2 solution, and methanol. The anti-wear properties of the lubricating oil prepared in Example 1 are greater than those in Comparative Examples 1 and 2. This demonstrates that Example 1 has the optimal material ratio. Combining the data of Example 1 with Comparative Examples 3 and 4, it can be seen that Example 1 differs from Comparative Examples 3 and 4 in the concentration of the FeCl2 solution. This demonstrates that the concentration of the FeCl2 solution in Example 1 is the optimal.

[0096] Combining the data of Example 1 and Comparative Example 5, it can be seen that the magnesium hydroxysilicate in Comparative Example 5 has not been modified. The wear resistance of the lubricating oil prepared in Example 1 is higher than that of Comparative Example 5. After the surface of the magnesium hydroxysilicate is coated with iron nanoparticles, an oxide film is formed on the surface of the iron-based metal at high temperature during the friction pair wear. The interface bonding strength with the iron oxide coated with the magnesium hydroxysilicate is higher, so that when the friction pair and the repair agent are worn, the modified magnesium hydroxysilicate can be firmly embedded in the matrix, thereby increasing the resistance of the iron-based metal to local deformation and improving the wear resistance.

[0097] Combining the data of Example 1 and Comparative Example 6, it can be seen that the lubricating oil prepared in Example 1 has higher anti-wear properties than that of Comparative Example 6. The concentration of the reducing agent determines whether ferric oxide can be successfully coated on the surface of the magnesium silicate hydroxylate. The reducing agent concentration in Comparative Example 6 is too low, the coating amount of ferric oxide is reduced, the performance of the modified magnesium silicate hydroxylate is reduced, and the wear amount of the lubricating oil anti-wear repair agent is reduced. After the surface of the magnesium silicate hydroxylate in Comparative Example 6 is coated with iron nanoparticles, an oxide film is formed on the surface of the iron-based metal at high temperature during the friction pair grinding. The interface bonding strength with the iron oxide coated with the magnesium silicate hydroxylate is higher, so that when the friction pair and the repair agent are grinding, the modified magnesium silicate hydroxylate can be firmly embedded in the matrix, increasing the iron-based metal's resistance to local deformation and improving wear resistance.

[0098] Combined with the data of Example 1 and Comparative Example 7, it can be seen that the anti-wear property of the lubricating oil prepared in Example 1 is higher than that of Comparative Example 7. The concentration of the reducing agent determines whether the ferric oxide can be successfully coated on the surface of the magnesium silicate hydroxyl group. The reducing agent concentration of Comparative Example 7 is too high, and the ferric oxide generated on the surface of the magnesium silicate hydroxyl group agglomerates. The performance of the modified magnesium silicate hydroxyl group is reduced, and the lubricating oil anti-wear repair agent is unevenly worn during the wear process, resulting in a decrease in the amount of wear. After the magnesium silicate hydroxyl group surface is coated with iron nanoparticles, when the friction pair is worn, at high temperatures, a layer of oxide film is generated on the surface of the iron-based metal, and the interface bonding strength with the iron oxide coated with the magnesium silicate hydroxyl group is higher, so that when the friction pair and the repair agent are worn, the modified magnesium silicate hydroxyl group can be firmly embedded in the matrix, so that the iron-based metal's resistance to local deformation increases and the wear resistance is improved. It can be seen from this that the amount of the reducing agent determines the coating amount of the magnesium silicate hydroxyl group.

[0099] Figure 1 The wear rate of the lubricating oil anti-wear repair agent prepared in Example 1 changes with time. The steel / cast iron friction pair test was carried out on a ball-on-disc wear tester: the sliding speed was 1.44 mg, the load was 392 N. The cyclic drip method was adopted, the drip rate was 3 drops / s, and the travel distance was 1751 km. Figure 1 As can be seen, the wear at each test point alternates near the zero wear line, indicating an increase in the disc's mass after wear, indicating wear repair. In particular, zero wear was maintained from 144 hours to 192 hours, demonstrating the full effectiveness of the anti-wear repair agent. The wear self-repair phenomenon persisted and recurred throughout the test, demonstrating that the repair process is dynamic: wear is simultaneously repaired.

[0100] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An anti-wear repair agent for automotive lubricating oil, characterized in that: The invention comprises 10-25 parts by mass of an oily solvent, 1-3 parts by mass of dodecyltrimethoxysilane, and 30-70 parts by mass of modified hydroxy magnesium silicate. The preparation method of the modified hydroxy magnesium silicate comprises the following steps: adding hydroxy magnesium silicate and FeCl2 solution into methanol and stirring to obtain a solution; adding a reducing agent to the solution under nitrogen protection; and separating the black precipitate obtained after ultrasonication, which is the modified hydroxy magnesium silicate.

2. The anti-wear repair agent for automotive lubricating oil according to claim 1, characterized in that: The reducing agent is NaBH4 solution.

3. The anti-wear repair agent for automotive lubricating oil according to claim 2, characterized in that: The concentration of the NaBH4 solution is 0.08-0.1 mol / L.

4. The anti-wear repair agent for automotive lubricating oil according to claim 1, characterized in that: The mass ratio of the magnesium silicate hydroxide, FeCl2 solution and methanol is (5-7):(0.5-1):(30-40).

5. The anti-wear repair agent for automotive lubricating oil according to claim 1, characterized in that: The concentration of the FeCl2 solution is 0.01-0.03 mol / L.

6. The anti-wear repair agent for automotive lubricating oil according to claim 1, characterized in that: The oily solvent is mineral oil or synthetic oil.

7. The method for preparing an anti-wear repair agent for automotive lubricating oil according to any one of claims 1 to 6, characterized in that: include: Step 1: adding modified magnesium hydroxysilicate and a silane coupling agent to ethanol, stirring at 30-45° C. for 1 hour, and drying at 60° C. for 12 hours to obtain a product; Step 2: fully stir and mix the product of step 1 and the oily solvent, and heat and keep warm at 35-45° C. for 20-45 minutes to obtain the automotive lubricant anti-wear repair agent.

8. The method for preparing an anti-wear repair agent for automotive lubricating oil according to claim 7, characterized in that: The silane coupling agent is dodecyltrimethoxysilane.

9. The method for preparing an anti-wear repair agent for automotive lubricating oil according to claim 8, characterized in that: The mass ratio of the dodecyltrimethoxysilane to ethanol is 1:

150.

10. A lubricating oil comprising the automotive lubricating oil anti-wear repair agent according to any one of claims 1 to 6.

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