A kind of anti-wear repair agent for lubricating oil for vehicle, its preparation method and lubricating oil

Abstract

The application relates to the technical field of self-repairing materials, and particularly discloses a vehicle lubricating oil anti-wear repairing agent, a preparation method thereof and lubricating oil; the vehicle lubricating oil anti-wear repairing agent comprises 10-25 mass parts of an oily solvent, 1-3 mass parts of dodecyltrimethoxysilane and 30-70 mass parts of modified magnesium hydroxysilicate; after the iron nanoparticles are coated on the surface of the magnesium hydroxysilicate, the interface bonding strength is higher when the friction pairs are matched, the local deformation resistance of the iron-based metal is increased, and the wear resistance is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of self-repairing materials, and more particularly to a vehicle lubricating oil anti-wear repair agent, a preparation method thereof and a lubricating oil. BACKGROUND

[0002] As an important consumer of energy consumption, energy saving of automobiles becomes particularly important. Among the heat generated by engine fuel combustion, about 20-30% of the energy is wasted in the form of friction. Therefore, reducing wear, reducing energy consumption and greatly prolonging the service life of equipment have gradually become the focus of attention.

[0003] Lubricating oil is an indispensable part of mechanical operation and maintenance. With the increasing of working parameters such as load, speed and temperature of modern mechanical equipment, the original friction-reducing agent and anti-wear agent in lubricating oil cannot fully meet the requirements of its friction-reducing 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 used to improve the lubricating performance and anti-wear performance of lubricating oil. For example, a kind of lubricating oil compound additive, its preparation method and lubricating oil are disclosed in Chinese patent CN108977253B. The additive is prepared from silane coupling agent, graphene and copper nanowire. The copper nanowire and graphene compound system and the surface of the steel ball form a film layer with good anti-wear and friction-reducing performance. At the same time, the layered structure of copper nanowire and graphene can improve the friction-reducing and anti-wear performance of lubricating oil, and even achieve certain self-repairing effect, so that the lubricating performance is greatly improved.

[0004] In the field of adding nano additives to lubricating oil, most of the added particles are single. Although the performance of lubricating oil has been improved, many advantages of nano additive particles have not been fully played out. In recent years, the research on nano particle composite additives has attracted widespread attention. The compound system nano particle refers to the stable and uniform dispersion of two or more nano particles in lubricant. By utilizing the characteristics and mechanism of different particles, the performance of lubricant can be significantly improved. The tribological performance of compound system nano particle is usually more excellent than that of single nano particle. Therefore, the research on compound nano particle is of great significance. However, at present, as a lubricating oil additive, nano particle has the problems of single function, agglomeration of nano particle and uneven dispersion in base oil, which leads to poor anti-wear and friction-reducing effect and poor lubricating effect. SUMMARY

[0005] In order to solve the problem of poor anti-wear and friction-reducing effect of the existing nano particle as a lubricating oil additive, which cannot achieve good lubricating effect, the present application provides a vehicle lubricating oil anti-wear repair agent, a preparation method thereof and a lubricating oil.

[0006] In a first aspect, the application provides a kind of vehicle lubricating oil antiwear repair agent, using the following technical solutions:

[0007] The vehicle lubricating oil antiwear repair agent includes 10-25 parts by mass of oily solvent, 1-3 parts by mass of dodecyl trimethoxysilane, and 30-70 parts by mass of modified magnesium hydroxyl silicate.

[0008] By using the above technical solution, the main components of the current self-repairing material are complex ore powder mainly composed of magnesium hydroxyl silicate, a small amount of catalyst and additive, which are added to the carrier lubricant. Its characteristics are that the self-repairing process of the iron-based metal wear part can be completed during operation without disassembling the mechanical device, a metal ceramic protective layer with excellent friction-reducing performance is generated to avoid direct contact between the friction pair metal surfaces, the hardness and smoothness of the friction surface are improved, and the friction coefficient is greatly reduced. At the same time, the self-repairing process of the iron-based metal wear part can be completed during the operation of the equipment, thereby prolonging the service life of the equipment.

[0009] However, the interface bonding between the added ore powder and the iron-based metal is weak during direct contact, resulting in poor wettability of the ore powder and the iron-based metal. After coating the iron nanoparticles on the surface of the magnesium hydroxyl silicate, when the friction pair is worn, a layer of oxide film is generated on the surface of the iron-based metal at high temperature, and the interface bonding strength between the oxide film and the coated iron oxide of the magnesium hydroxyl silicate is higher. Therefore, when the friction pair is worn with the repair agent, the modified magnesium hydroxyl silicate can be firmly embedded into the matrix, thereby increasing the local deformation resistance of the iron-based metal and improving the wear resistance. The modified magnesium hydroxyl silicate is more conducive to improving the wear resistance of the iron-based metal.

[0010] Optionally, the preparation method of the modified magnesium hydroxyl silicate is as follows: magnesium hydroxyl silicate and FeCl2 solution are added to methanol and stirred to obtain a solution, NaBH4 solution is added to the solution under nitrogen protection, and the obtained black precipitate is separated after ultrasonic treatment for 30 min.

[0011] By using the above technical solution, FeCl2 solution generates a layer of iron oxide nanoparticles on the surface of magnesium hydroxyl silicate under the action of reducing agent NaBH4, and the particle size of the nanoparticles is 200-500 nm. After coating the iron nanoparticles on the surface of the magnesium hydroxyl silicate, the local deformation resistance of the iron-based metal is increased, and the wear resistance is improved.

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

[0013] By adopting the technical scheme, the FeCl2 is reduced to the iron trioxide nanoparticles by the reducing agent NaBH4 solution, the particle size of the iron trioxide nanoparticles is 200-500 nm, and the local deformation resistance and wear resistance of the iron-based metal are increased after the iron nanoparticles are coated by the magnesium hydroxyl silicate. The suitable concentration of the reducing agent for generating the iron nanoparticles is 0.08-0.1 mol / L. If the concentration exceeds the range, on the one hand, the coating amount of the iron nanoparticles is insufficient; on the other hand, the nanoparticles are aggregated, and the wear resistance of the nanoparticles is poor.

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

[0015] By adopting the technical scheme, the iron nanoparticles need to be coated by adjusting the mass ratio of the magnesium hydroxyl silicate, the FeCl2 solution and the methanol. If the mass ratio is less than the above ratio, the wear reduction effect of the coated iron nanoparticles is reduced. If the mass ratio exceeds the above ratio, the content of the iron nanoparticles is too high, the nanoparticles are aggregated, and the wear reduction effect of the nanoparticles is poor.

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

[0017] By adopting the technical scheme, the suitable concentration of the FeCl2 solution for generating the iron nanoparticles is 0.01-0.03 mol / L. If the concentration exceeds the range, on the one hand, the coating amount of the iron nanoparticles is insufficient; on the other hand, the nanoparticles are aggregated, and the wear resistance of the nanoparticles is poor.

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

[0019] By adopting the technical scheme, the mineral oil or the synthetic oil is used as the oily solvent of the repair agent, and the compatibility of the repair agent and the lubricating oil body can be enhanced, and good lubrication effect can be achieved.

[0020] In a second aspect, the application provides a preparation method of the lubricating oil anti-wear repair agent for vehicles, which comprises the following steps:

[0021] In step one, the modified magnesium hydroxyl silicate and the dodecyl trimethoxysilane are added into ethanol, stirred at 30-45 ℃ for 1 h, and dried at 60 ℃ for 12 h to obtain a product.

[0022] In step two, the product in step one and the oily solvent are fully stirred and mixed, heated and kept at 35-45 ℃ for 20-45 min to obtain the lubricating oil anti-wear repair agent for vehicles.

[0023] By adopting the technical scheme, the dodecyl trimethoxysilane is grafted on the surface of the modified magnesium silicate hydroxide.

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

[0025] By adopting the technical scheme, the dodecyl trimethoxysilane is grafted on the surface of the modified magnesium silicate hydroxide.

[0026] The application discloses a lubricating oil which comprises the vehicle lubricating oil anti-wear repairing agent.

[0027] In conclusion, the application has the following advantages:

[0028] 1. The modified magnesium silicate hydroxide is added into the carrier lubricant together with a small amount of catalyst and additive.

[0029] However, the interface bonding between the added mineral powder and the iron-based metal is weak during the direct contact, resulting in poor wettability of the mineral powder and the iron-based metal.

[0030] 2. The dodecyl trimethoxysilane is dissolved in the ethanol and grafted on the surface of the modified magnesium silicate hydroxide to improve the hydrophobic and oleophilic properties of the modified magnesium silicate hydroxide.

[0031] The dodecyl trimethoxysilane is grafted on the surface of the modified magnesium silicate hydroxide.

[0032] 3. A layer of Fe203nanoparticles with a particle size of 200-500 nm is formed on the surface of magnesium hydroxyl silicate under the action of the reducing agent NaBH4. After the magnesium hydroxyl silicate is coated with iron nanoparticles, a layer of oxide film is formed on the surface of the iron metal under high temperature when the friction pair is rubbed, and the interface bonding strength between the magnesium hydroxyl silicate coated iron oxide is higher, so that the modified magnesium hydroxyl silicate can be firmly embedded into the base body when the friction pair is rubbed with the repair agent, the local deformation resistance of the iron metal is increased, and the wear resistance is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The wear amount of the anti-wear repair agent for the vehicle lubricating oil prepared in Example 1 changes with time. DETAILED DESCRIPTION

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

[0035] The present application is further described in detail below in combination with examples and comparative examples.

[0036] Preparation Example 1

[0037] Preparation of modified magnesium hydroxyl silicate: dissolve NaBH4in deionized water to prepare a 0.1 mol / L NaBH4reducing agent solution for standby. Weigh a certain amount of FeCl2·4H2O and dissolve it in deionized water to prepare a 0.09 mol / L FeCl2solution as an iron source for standby. 6 g of magnesium hydroxyl silicate and 0.9 g of FeCl2solution are added to 35 g of methanol and stirred to obtain a solution. Under the protection of nitrogen, 5 mL of NaBH4solution is injected into the solution by using a syringe pump, and ultrasonic treatment is performed for 30 min. The black precipitate generated in the reaction is separated by a magnet, which is the modified magnesium hydroxyl silicate. The modified magnesium hydroxyl silicate is washed with ethanol for 5 times and dried in a vacuum drying box for 24 h. The modified magnesium hydroxyl silicate sample is obtained for testing.

[0038] Preparation Example 2

[0039] Preparation of modified magnesium hydroxyl silicate: dissolve NaBH4 in deionized water to prepare a 0.1 mol / L NaBH4 reducing agent solution for standby. 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 for standby. Add 5 g of magnesium hydroxyl silicate and 0.5 g of FeCl2 solution to 30 mL 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, ultrasonic for 30 min, and use a magnet to separate the black precipitate generated by the reaction, which is the modified magnesium hydroxyl silicate. Wash with ethanol for 5 times, and dry in a vacuum drying oven for 24 h. The modified magnesium hydroxyl silicate sample is obtained for testing.

[0040] Preparation Example 3

[0041] Preparation of modified magnesium hydroxyl silicate: dissolve NaBH4 in deionized water to prepare a 0.1 mol / L NaBH4 reducing agent solution for standby. 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 for standby. Add 7 g of magnesium hydroxyl silicate and 1 g of FeCl2 solution to 40 mL 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, ultrasonic for 30 min, and use a magnet to separate the black precipitate generated by the reaction, which is the modified magnesium hydroxyl silicate. Wash with ethanol for 5 times, and dry in a vacuum drying oven for 24 h. The modified magnesium hydroxyl silicate sample is obtained for testing.

[0042] Comparative Preparation Example 1

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

[0044] Dissolve NaBH4 in deionized water to prepare a 0.1 mol / L NaBH4 reducing agent solution for standby. 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 for standby. Add 4 g of magnesium hydroxyl silicate and 0.4 g of FeCl2 solution to 28 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, ultrasonic for 30 min, and use a magnet to separate the black precipitate generated by the reaction, which is the modified magnesium hydroxyl silicate. Wash with ethanol for 5 times, and dry in a vacuum drying oven for 24 h. The modified magnesium hydroxyl silicate sample is obtained for testing.

[0045] Comparative Preparation Example 2

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

[0047] Dissolve NaBH4 in deionized water to prepare a 0.1 mol / L NaBH4 reducing agent solution for standby. 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 for standby. Add 9 g of magnesium hydroxyl silicate 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, and ultrasonic for 30 min. Use a magnet to separate the black precipitate generated in the reaction, which is the modified magnesium hydroxyl silicate. Wash it with ethanol for 5 times, and dry it in a vacuum drying oven for 24 h. The modified magnesium hydroxyl silicate sample is obtained for testing.

[0048] Comparative Preparation Example 3

[0049] The difference from Preparation Example 1 is that the concentration of 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 standby. 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 for standby. Add 6 g of magnesium hydroxyl silicate 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, and ultrasonic for 30 min. Use a magnet to separate the black precipitate generated in the reaction, which is the modified magnesium hydroxyl silicate. Wash it with ethanol for 5 times, and dry it in a vacuum drying oven for 24 h. The modified magnesium hydroxyl silicate sample is obtained for testing.

[0051] Comparative Preparation Example 4

[0052] The difference from Preparation Example 1 is that the concentration of 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 standby. 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 for standby. Add 6 g of magnesium hydroxyl silicate 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, and ultrasonic for 30 min. Use a magnet to separate the black precipitate generated in the reaction, which is the modified magnesium hydroxyl silicate. Wash it with ethanol for 5 times, and dry it in a vacuum drying oven for 24 h. The modified magnesium hydroxyl silicate sample is obtained 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 hydroxyl silicate: NaBH4 is dissolved in deionized water to prepare a NaBH4 reducing agent solution with a concentration of 0.05 mol / L for standby use. A certain amount of FeCl2·4H2O is dissolved in deionized water to prepare a FeCl2 solution with a concentration of 0.09 mol / L for standby use as an iron source. 6 g of magnesium hydroxyl silicate and 0.9 g of the FeCl2 solution are added to 35 g of methanol for stirring to obtain a solution. Under nitrogen protection, 5 mL of the NaBH4 solution is injected into the solution by using a syringe pump, and ultrasonic treatment is performed for 30 min. The black precipitate generated in the reaction is separated by a magnet, which is modified magnesium hydroxyl silicate. The product is washed with ethanol for 5 times and dried in a vacuum drying oven for 24 h. The modified magnesium hydroxyl silicate sample is obtained 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 hydroxyl silicate: NaBH4 is dissolved in deionized water to prepare a NaBH4 reducing agent solution with a concentration of 0.2 mol / L for standby use. A certain amount of FeCl2·4H2O is dissolved in deionized water to prepare a FeCl2 solution with a concentration of 0.09 mol / L for standby use as an iron source. 6 g of magnesium hydroxyl silicate and 0.9 g of the FeCl2 solution are added to 35 g of methanol for stirring to obtain a solution. Under nitrogen protection, 5 mL of the NaBH4 solution is injected into the solution by using a syringe pump, and ultrasonic treatment is performed for 30 min. The black precipitate generated in the reaction is separated by a magnet, which is modified magnesium hydroxyl silicate. The product is washed with ethanol for 5 times and dried in a vacuum drying oven for 24 h. The modified magnesium hydroxyl silicate sample is obtained for testing.

[0060] Example 1

[0061] The present example provides a lubricating oil anti-wear repair agent for vehicles, and a preparation method thereof, which comprises the following steps:

[0062] Step one, 60 g of modified magnesium hydroxyl silicate and 2 g of dodecyltrimethoxysilane prepared by the preparation method of Preparation Example 1 are added to 300 mL of ethanol, stirred at 40°C for 1 h, and then dried in a vacuum drying oven at 60°C for 12 h to obtain the product.

[0063] Step two, the product in step one and 20 g of mineral oil are fully stirred and mixed, heated and kept at 40°C for 30 min to obtain the lubricating oil anti-wear repair agent for vehicles.

[0064] Example 2

[0065] The embodiment provides a lubricating oil anti-wear repair agent for vehicles, and a preparation method thereof.

[0066] Step one, the modified magnesium silicate hydroxide prepared by the preparation example 2 is used, 30g of the modified magnesium silicate hydroxide, 1g of dodecyl trimethoxysilane are added into 150mL of ethanol, after stirring at 35°C for 1h, drying at 60°C in a vacuum drying box for 12h, the product is obtained;

[0067] Step two, the product in step one and 10g of mineral oil are fully stirred and mixed, and heated and kept at 40°C for 30min, and the lubricating oil anti-wear repair agent for vehicles is obtained.

[0068] Example 3

[0069] The embodiment provides a lubricating oil anti-wear repair agent for vehicles, and a preparation method thereof.

[0070] Step one, the modified magnesium silicate hydroxide prepared by the preparation example 3 is used, 70g of the modified magnesium silicate hydroxide, 3g of dodecyl trimethoxysilane are added into 450mL of ethanol, after stirring at 45°C for 1h, drying at 60°C in a vacuum drying box for 12h, the product is obtained;

[0071] Step two, the product in step one and 25g of mineral oil are fully stirred and mixed, and heated and kept at 40°C for 30min, and the lubricating oil anti-wear repair agent for vehicles is obtained.

[0072] Comparative example 1

[0073] The comparative example provides a lubricating oil anti-wear repair agent for vehicles, which is different from the example 1 in that the modified magnesium silicate hydroxide is the modified magnesium silicate hydroxide sample prepared by the comparative preparation example 1.

[0074] Comparative example 2

[0075] The comparative example provides a lubricating oil anti-wear repair agent for vehicles, which is different from the example 1 in that the modified magnesium silicate hydroxide is the modified magnesium silicate hydroxide sample prepared by the comparative preparation example 2.

[0076] Comparative example 3

[0077] The comparative example provides a lubricating oil anti-wear repair agent for vehicles, which is different from the example 1 in that the modified magnesium silicate hydroxide is the modified magnesium silicate hydroxide sample prepared by the comparative preparation example 3.

[0078] Comparative example 4

[0079] The comparative example provides a lubricating oil anti-wear repair agent for vehicles, which is different from the example 1 in that the modified magnesium silicate hydroxide is the modified magnesium silicate hydroxide sample prepared by the comparative preparation example 4.

[0080] Comparative Example 5

[0081] Step 1: 60 g of magnesium hydroxyl silicate and 2 g of dodecyl trimethoxy silane were added into 300 mL of ethanol, stirred at 40 °C for 1 h, and then dried in a vacuum drying oven at 60 °C for 12 h to obtain the product.

[0082] Step 2: The product from Step 1 and 20 g of mineral oil were mixed well and heated at 40 °C for 30 min to obtain the anti-wear repair agent for vehicle lubricating oil.

[0083] Comparative Example 6

[0084] This comparative example provides an anti-wear repair agent for vehicle lubricating oil, which is different from Example 1 in that the modified magnesium hydroxyl silicate is the modified magnesium hydroxyl silicate sample prepared in Comparative Preparation Example 6.

[0085] Comparative Example 7

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

[0087] Performance test of the anti-wear repair agents for vehicle lubricating oil prepared in Examples 1-3 and Comparative Examples 1-7:

[0088] The anti-wear repair agents for vehicle lubricating oil prepared in the above examples and comparative examples were added into SM10W-40 gasoline engine oil at a proportion of 3% by mass for testing.

[0089] Friction and wear test: The anti-wear repair agents for vehicle lubricating oil in the above examples and comparative examples were determined by the four-ball method according to GB314-82 standard. The four-ball tester used in the experiment was model MRS-1J, the steel ball was a secondary standard steel ball (GC15 bearing, HRC was 59-61), the rotation speed was 1480 r / min, and the temperature was room temperature.

[0090] The 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] In combination with the data of Examples 1-3, it can be seen that the difference between Examples 1-3 is only that the raw material composition ratio is different, and the wear scar diameter of Example 1 is lower than that of Examples 2 and 3, which proves that the anti-wear property of Example 1 is the highest, and the raw material ratio is the best.

[0095] In combination with the data of Example 1 and Comparative Examples 1 and 2, it can be seen that the difference between Example 1 and Comparative Examples 1 and 2 is that the mass ratio of magnesium hydroxyl silicate, FeCl2 solution and methanol is different. The anti-wear property of the lubricating oil prepared in Example 1 is higher than that of Comparative Examples 1 and 2. It is proved that the material ratio of Example 1 is the best. In combination with the data of Example 1 and Comparative Examples 3 and 4, it can be seen that the difference between Example 1 and Comparative Examples 3 and 4 is that the concentration of FeCl2 solution is different. It is proved that the concentration of FeCl2 solution of Example 1 is the best.

[0096] In combination with the data of Example 1 and Comparative Example 5, it can be seen that the magnesium hydroxyl silicate of Comparative Example 5 is not modified. The anti-wear property of the lubricating oil prepared in Example 1 is higher than that of Comparative Example 5. After the surface of the magnesium hydroxyl silicate is coated with iron nanoparticles, when the friction pair is rubbed, a layer of oxide film is generated on the surface of the iron-based metal at high temperature, and the interfacial bonding strength between the oxide film and the coated iron oxide of the magnesium hydroxyl silicate is higher. Therefore, when the friction pair is rubbed with the repair agent, the modified magnesium hydroxyl silicate can be firmly embedded into the matrix, the local deformation resistance of the iron-based metal is increased, and the wear resistance is improved.

[0097] In combination with the data of Example 1 and Comparative Example 6, it can be seen that the anti-wear property of the lubricating oil prepared in Example 1 is higher than that of Comparative Example 6. The concentration of the reducing agent determines whether the iron sesquioxide can be successfully coated on the surface of the magnesium hydroxyl silicate. The concentration of the reducing agent of Comparative Example 6 is too low, the coating amount of the iron sesquioxide is reduced, the performance of the modified magnesium hydroxyl silicate is decreased, and the wear amount of the anti-wear repair agent of the lubricating oil is reduced. After the surface of the magnesium hydroxyl silicate of Comparative Example 6 is coated with iron nanoparticles, when the friction pair is rubbed, a layer of oxide film is generated on the surface of the iron-based metal at high temperature, and the interfacial bonding strength between the oxide film and the coated iron oxide of the magnesium hydroxyl silicate is higher. Therefore, when the friction pair is rubbed with the repair agent, the modified magnesium hydroxyl silicate can be firmly embedded into the matrix, the local deformation resistance of the iron-based metal is increased, and the wear resistance is improved.

[0098] In combination 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, and the concentration of the reducing agent determines whether the iron trioxide can be successfully coated on the surface of magnesium hydroxyl silicate. In Comparative Example 7, the concentration of the reducing agent is too high, the iron trioxide generated on the surface of magnesium hydroxyl silicate agglomerates, the performance of the modified magnesium hydroxyl silicate decreases, and the anti-wear repair agent of the lubricating oil is unevenly worn in the wear process, resulting in a decrease in the wear amount. After the surface of the magnesium hydroxyl silicate is coated with iron nanoparticles, due to the friction pair against the wear, a layer of oxide film is generated on the surface of the iron-based metal at high temperature, and the interfacial bonding strength between the oxide film and the iron oxide coated by the magnesium hydroxyl silicate is higher, so that when the friction pair is worn against the repair agent, the modified magnesium hydroxyl silicate can be firmly embedded into the matrix, the anti-local deformation capacity of the iron-based metal is increased, and the wear resistance is improved. It can be seen that the amount of the reducing agent determines the coating amount of the magnesium hydroxyl silicate.

[0099] Figure 1 The wear amount of the lubricating oil anti-wear repair agent prepared in Example 1 changes with time. Steel / cast iron friction pair tests were carried out on a ball-on-disc wear tester: the sliding speed was 1.44 mg, and the load was selected as 392 N. A circulating dripping method was used, the dripping speed was 3 drops / s, and the travel distance was 1751 km. The wear amount of the disc was calculated according to the following formula: Figure 1 It can be seen that the wear amount of each test point alternately appears near the zero wear line, that is, the mass of the disc increases after wear, which indicates that the wear is repaired. In particular, the zero wear state is basically maintained at 144h-192h, which indicates that the effect of the anti-wear repair agent is fully exerted. In the whole test process, the wear self-repairing phenomenon exists and is repeated, which proves that the repair process is a dynamic process, that is, it is worn on one side and repaired on the other side.

[0100] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, as long as the modifications are within the scope of the claims of the present application.

Claims

1. An antiwear restorer for lubricating oil for use in an automobile, characterized by comprising: The lubricating oil 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 magnesium hydroxyl silicate, wherein the modified magnesium hydroxyl silicate is prepared by the following method: hydroxyl silicate and a FeCl2 solution are added to methanol to obtain a solution, a reducing agent is added to the solution under nitrogen protection, and the obtained black precipitate after ultrasonic treatment is the modified magnesium hydroxyl silicate; The reducing agent is a NaBH4 solution, and the concentration of the NaBH4 solution is 0.08-0.1 mol / L. The mass ratio of the hydroxyl silicate, the FeCl2 solution and the methanol is (5-7):(0.5-1):(30-40). The concentration of the FeCl2 solution is 0.01-0.03 mol / L.

2. The antiwear restorer for lubricating oil for vehicles according to claim 1, characterized in that: The oily solvent is mineral oil or synthetic oil.

3. The method for preparing the anti-wear repair agent of the lubricating oil for vehicle according to any one of claims 1-2, characterized in that: The lubricating oil comprises: Step one: the modified magnesium hydroxyl silicate and dodecyltrimethoxysilane are added to ethanol, stirred at 30-45 DEG C for 1 h, and dried at 60 DEG C for 12 h to obtain a product; Step two: the product in step one and the oily solvent are fully stirred and mixed, heated and kept at 35-45 DEG C for 20-45 min to obtain the lubricating oil anti-wear repair agent.

4. The preparation method of the automotive lubricating oil anti-wear repair agent according to claim 3, characterized in that: The mass ratio of the dodecyltrimethoxysilane to ethanol is 1:

150.

5. A lubricating oil comprising the lubricating oil anti-wear repair agent according to any one of claims 1-2.

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