An anti-electrocorrosion engine oil for a hybrid vehicle and a method for preparing the same

Abstract

The present application relates to the technical field of lubricating oil, in particular to an anti-electric corrosion engine oil for hybrid cars and a preparation method thereof, the present application uses modified synthetic base oil as a carrier, and combines modified anti-electric corrosion complex agent, polylactic acid / polyurethane composite modifier and nano modified filler and other functional components, and realizes molecular level compatibility and synergistic effect of each component through the preparation method of raw material pretreatment, step-by-step compounding, ultrasonic dispersion and precise process control, effectively solves the problem of insufficient compatibility of anti-electric corrosion components, base oil and functional modifiers in the prior art, achieves the comprehensive effect of stable and continuous anti-electric corrosion protection, viscosity performance adaptation to engine working condition, outstanding oxidation stability, excellent lubricating and anti-wear effect and good low temperature adaptability, and has wide application prospect in the field of lubrication and protection of hybrid car engines.

Description

Technical Field

[0001] This invention relates to the field of lubricating oil technology, and in particular to an anti-electro-corrosion engine oil for hybrid vehicles and its preparation method. Background Technology

[0002] Shape memory polymers are a class of polymeric materials with special intelligent response characteristics. Their core feature is that they can accurately recover from a human-set temporary shape to a pre-designed permanent shape under external stimuli such as heat and chemicals. These materials have extremely high structural adjustability and can be adapted to different application requirements through molecular chain design, component ratio optimization, etc. They also have good compatibility with various matrix materials and functional additives. Therefore, they have been widely studied and applied in related fields such as material functional modification and performance improvement. Anti-electrochemical corrosion engine oil is a type of lubricating oil product designed for specific working environments. Its core function is to form a stable and dense protective layer on the surface of engine metal parts while ensuring the basic lubrication performance of the oil (such as friction reduction, heat dissipation, and sealing). This resists the erosion of the parts by electrochemical corrosion, thereby extending the service life of engine parts and ensuring the stable operation of the equipment.

[0003] In existing technologies, a key problem with anti-electrochemical corrosion engine oils is the insufficient synergistic compatibility between the anti-electrochemical corrosion components, base oil, and functional modifiers. This issue directly affects the stability and long-term effectiveness of the oil's anti-electrochemical corrosion performance. Traditional anti-electrochemical corrosion components are mostly single-structure functional compounds, lacking sites in their molecular structure to form effective entanglement or interaction with the molecular chains of the base oil. This leads to uneven dispersion in the oil system, especially during temperature fluctuations or long-term use. These components are prone to aggregation, preventing the anti-corrosion components from uniformly covering the surface of engine metal parts. The resulting protective layer has obvious weak areas, making it difficult to achieve comprehensive and continuous anti-electrochemical corrosion protection. Meanwhile, when functional modifiers are introduced to improve the overall performance of the oil, the functional groups of the modifiers are prone to unexpected chemical reactions with the active sites of the anti-electro-corrosion components, which can damage the structural integrity of the anti-electro-corrosion components or lead to the formation of incompatible micro-regions between the two, thereby disrupting the continuity of the oil film and making the protective layer prone to damage and detachment. This lack of synergistic compatibility not only leads to a rapid decline in the anti-electro-corrosion performance of the oil, but may also indirectly affect other key performances of the oil, such as viscosity stability and lubrication and friction reduction effects, shortening the effective service life of the oil and increasing the risk of engine parts failing due to corrosion and wear. It is difficult to meet the long-term requirements for the overall performance of the oil in practical applications.

[0004] Therefore, based on the relevant technologies mentioned above, there is an urgent need to develop an anti-electro-corrosion engine oil for hybrid vehicles and its preparation method. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide an anti-electro-corrosion engine oil for hybrid vehicles and its preparation method, so as to solve the problem of insufficient synergistic compatibility between anti-electro-corrosion components and base oils and functional modifiers in the prior art.

[0006] To achieve the above objectives, the present invention provides an anti-electro-corrosion engine oil for hybrid vehicles and a method for preparing the same.

[0007] An anti-electro-corrosion engine oil for hybrid vehicles is prepared from the following raw materials in parts by weight: 60-90 parts modified synthetic base oil, 10-20 parts modified anti-electro-corrosion composite agent, 8-20 parts polylactic acid / polyurethane composite modifier, 3-8 parts nano-modified filler, 1-4 parts antioxidant, 2-6 parts friction modifier, 0.5-2 parts metal passivator, and 1-3 parts stabilizer; The modified synthetic base oil is a blend of polyalphaolefin base oil and oxygen-containing base oil in a mass ratio of 3-5:1; The modified anti-electro-corrosion composite agent is prepared by nitrogen-containing heterocyclic compounds, organic amine derivatives and phosphorus-containing organic compounds in a mass ratio of 4-6:3-5:2-4; The polylactic acid / polyurethane composite modifier is prepared by compatibilizing and modifying polylactic acid polymer (L-lactic acid, PLLA, number average molecular weight 50,000-80,000) and thermoplastic polyurethane with maleic anhydride grafted onto polyolefin, wherein the mass ratio of polylactic acid polymer (L-lactic acid, PLLA, number average molecular weight 50,000-80,000): thermoplastic polyurethane: polyolefin grafted with maleic anhydride is 7:3:0.5-1.2; The nano-modified filler is a silane coupling agent modified nano-inorganic filler / clay composite filler, with a mass ratio of nano-inorganic filler to clay of 3-4:1. Modified synthetic base oil provides a stable carrier for the system, modified anti-electro-corrosion composite agent imparts core anti-electro-corrosion capability to the oil, polylactic acid / polyurethane composite modifier improves the compatibility of each component and enhances overall performance, nano-modified filler strengthens the physical strength of the oil film, antioxidant inhibits oil oxidation and aging, friction modifier reduces wear on moving parts, metal passivator protects metal surfaces, and stabilizer maintains long-term system stability.

[0008] Preferably, the modified synthetic base oil has a kinematic viscosity of 10-15 mm at 40°C. 2 kinematic viscosity at 100℃ is 3-5 mm / s. 2 / s; the nitrogen-containing heterocyclic compound is a benzotriazole derivative (methylbenzotriazole, TTA), the organic amine derivative is an organic amine salt (dodecylamine phosphate), and the phosphorus-containing organic compound is a phosphate ester (tributyl phosphate, TBP); the polylactic acid polymer is polylactic acid (PLLA, number average molecular weight 50,000-80,000), the thermoplastic polyurethane is an aliphatic thermoplastic polyurethane (polyether-type aliphatic thermoplastic polyurethane, grade 1185A); the silane coupling agent is an epoxy silane coupling agent (KH -560), the nano-inorganic filler is nano-silica (particle size 20-40nm), the clay is sodium-based montmorillonite (particle size 100-200nm); the modified synthetic base oil with a specific viscosity is adapted to the operating conditions of hybrid vehicle engines, benzotriazole derivatives, organic amine salts and phosphate esters synergistically enhance the anti-electro-corrosion effect, the combination of polylactic acid and aliphatic thermoplastic polyurethane improves the compatibility between the modifier and the oil, and the epoxy silane coupling agent modification can enhance the dispersion stability of nano-silica and sodium-based montmorillonite and the binding force with the system.

[0009] Preferably, the modified synthetic base oil is prepared using the following method: Step D1. Weigh α-olefin monomer (1-decene) and oxygen-containing monomer (methyl methacrylate) at a mass ratio of 8-10:1, add them to the reaction vessel, and add catalyst (boron trifluoride diethyl ether complex) accounting for 0.1%-0.3% of the total mass of monomers. Then, purge the air in the vessel with nitrogen. Step D2. Control the reactor temperature to 80-100℃, pressure to 0.5-1.0MPa, and rotation speed to 200-300r / min, and stir the reaction for 4-6 hours to obtain the copolymer product; Step D3. Transfer the copolymer to a hydrogenation reactor, add 0.5%-1.0% of the copolymer mass of a hydrogenation catalyst (palladium on carbon catalyst, palladium loading 5%), control the temperature at 120-150℃ and the hydrogen pressure at 2-3MPa, and perform the hydrogenation reaction for 3-5 hours. Step D4. After hydrogenation, the product is subjected to vacuum distillation (vacuum degree -0.09--0.08MPa, temperature 180-200℃) to remove light components, and then refined with clay (the amount of clay added is 3%-5% of the product mass, stirred at 60-80℃ for 2h) to obtain polyα-olefin base oil; Step D5. Mix polyalphaolefin base oil and oxygen-containing base oil (polyethylene glycol dimethyl ether, molecular weight 200-400) at a mass ratio of 3-5:1, and stir at 50-60℃ for 30-40 minutes to obtain modified synthetic base oil. The polymerization reaction of alpha-olefin and oxygen-containing monomers constructs the molecular skeleton of the base oil. Hydrogenation treatment improves the chemical stability of the base oil. Vacuum distillation and clay refining remove impurities and unsaturated components. The blending process optimizes the viscosity and compatibility of the base oil.

[0010] Preferably, the polylactic acid / polyurethane composite modifier is prepared as follows: Step A1. Dry polylactic acid polymers (poly-L-lactic acid, PLLA, number average molecular weight 50,000-80,000) and thermoplastic polyurethanes (polyether aliphatic thermoplastic polyurethane, grade 1185A) in a vacuum oven at 60-70℃ for 8-10 hours, and pulverize them to 80-100 mesh to obtain dried polylactic acid polymer powder and thermoplastic polyurethane powder. Step A2. Weigh dry polylactic acid polymer powder and thermoplastic polyurethane powder at a mass ratio of 7:3, add them to a twin-screw extruder, and simultaneously add polyolefin grafted maleic anhydride (PP-g-MAH, grafting rate 1.5%-2.5%). Control the extruder barrel temperature at 160-195℃ and the screw speed at 50-80 r / min, and melt-blend and granulate. Step A3. Vacuum dry the blended particles at 70-80℃ for 6-8 hours, then pulverize them to 120-150 mesh to obtain polylactic acid / polyurethane composite modifier. Vacuum drying removes moisture from the raw materials to avoid affecting the blending effect, pulverization improves the uniformity of component mixing, melt blending enables polylactic acid and thermoplastic polyurethane to achieve molecular-level compatibility under the action of compatibilizer, and secondary drying and pulverization ensure the dispersibility of the modifier in the oil.

[0011] Preferably, the preparation method of the nano-modified filler is as follows: Step B1. Mix nano-inorganic filler (nano-silica, particle size 20-40nm) and clay (sodium montmorillonite, particle size 100-200nm) at a mass ratio of 3-4:1, and pulverize to 100-120 mesh to obtain mixed powder; Step B2. Prepare a 2%-3% (w / w) ethanol solution of silane coupling agent (KH-560). Mix the mixed powder with the ethanol solution of silane coupling agent at a mass ratio of 100:18-22 and add it to the reaction vessel. Step B3. Control the reactor temperature to 55-65℃ and the rotation speed to 300-400 r / min, and stir the reaction for 40-60 min; Step B4. After the reaction is complete, filter the mixture, wash it 2-3 times with anhydrous ethanol, and dry it in a vacuum oven at 75-85℃ for 3-4 hours to obtain the nano-modified filler. The nano-inorganic filler has a particle size of 20-40 nm, and the clay has a particle size of 100-200 nm. Mixing and pulverizing ensures uniform mixing of the nano-inorganic filler and the clay. The modification treatment with silane coupling agent improves the compatibility of the filler with the oil system. Washing removes unreacted coupling agent and impurities. The specific particle size filler after drying can effectively enhance the mechanical strength and stability of the oil film.

[0012] Preferably, the modified anti-electro-corrosion composite agent is prepared as follows: Step C1. Weigh the nitrogen-containing heterocyclic compound (methylbenzotriazole, TTA) and silane coupling agent (KH-560) at a mass ratio of 100:5-8, add them to the reaction vessel, add anhydrous ethanol as solvent, control the temperature at 40-50℃ and the rotation speed at 200-300 r / min, stir the reaction for 60-90 min, and obtain the modified nitrogen-containing heterocyclic compound; Step C2. Weigh the modified nitrogen-containing heterocyclic compound and the organic amine derivative (dodecylamine phosphate) at a mass ratio of 4-6:3-5, add them to the reaction vessel, and continue stirring for 30-40 minutes; Step C3. Add a phosphorus-containing organic compound (tributyl phosphate, TBP) to the reaction vessel, heat to 60-70℃, and continue stirring for 60-90 minutes. Step C4. After the reaction is complete, remove ethanol by vacuum distillation at 80-90℃ (vacuum degree -0.08--0.07MPa) to obtain the modified anti-electro-corrosion composite agent. The modification of nitrogen-containing heterocyclic compounds by silane coupling agent improves their dispersibility in oil. The stepwise reaction of nitrogen-containing heterocyclic compounds, organic amine derivatives and phosphorus-containing organic compounds forms a synergistic anti-electro-corrosion system. Vacuum distillation removes the solvent to ensure the purity and effectiveness of the composite agent.

[0013] Preferably, the preparation method of the anti-electro-corrosion engine oil for hybrid vehicles is as follows: Step S1. Raw material pretreatment: The modified synthetic base oil is vacuum dehydrated at 100-110℃ for 2-3 hours and cooled to room temperature for later use; the nano-modified filler is added to anhydrous ethanol and ultrasonically dispersed for 15-20 minutes to obtain a uniform dispersion. Step S2. Preparation of basic system: Add the uniformly dispersed liquid into a high-speed shear mill, control the temperature at 40-50℃ and the rotation speed at 1500-2000 r / min, and add the modified anti-electro-corrosion composite agent and the metal passivating agent (benzotriazole and thiadiazole derivatives in a mass ratio of 3-4:1) in sequence, and shear and mix for 30-40 min to obtain the mixed system; Step S3. Modification and Composite: Add polylactic acid / polyurethane composite modifier to the mixture, heat to 70-80℃, increase rotation speed to 2500-3000 r / min, and shear reaction for 60-90 min; then add nano-modified filler and ultrasonically disperse for 20-30 min; Step S4. Functional additive compounding: Cool to 50-60℃, add antioxidant (hindered phenol BHT and triphenyl phosphite compounded at a mass ratio of 2-3:1), friction modifier (molybdenum disulfide and fatty acid ester compounded at a mass ratio of 1:2-3), and stabilizer (triethyl phosphate), stir and mix for 40-60 minutes to obtain the cooled solvent; Step S5. Post-treatment: The cooled solvent is degassed at a vacuum of -0.08 to -0.06 MPa and a temperature of 60 to 70°C for 30 to 45 minutes, and impurities are removed by filtration to obtain an anti-electro-corrosion engine oil for hybrid vehicles. The raw material pretreatment removes moisture and impurities to avoid affecting product performance. The basic system preparation achieves the initial uniform mixing of core functional components. The modification and compounding steps enhance the synergistic effect of each component. The functional additives are compounded to improve the comprehensive performance of the oil. Post-treatment degassing and filtration ensure the purity and stability of the finished product.

[0014] Preferably, the ultrasonic-assisted dispersion in step S3 has a power of 300-500W and an ultrasonic frequency of 20-40kHz; after the polylactic acid / polyurethane composite modifier is added, the viscosity of the system is controlled at 1500-2500mPa·s; ultrasonic-assisted dispersion with specific power and frequency can ensure that the nano-modified filler is uniformly distributed in the system, and reasonable system viscosity control ensures that the components are fully mixed, while providing suitable flow properties for subsequent use.

[0015] Preferably, the stirring speed in step S4 is 1000-1500 r / min, and the water content of the system is controlled below 0.1% during the mixing process. The appropriate stirring speed ensures that the antioxidants, friction modifiers and other additives are evenly dispersed, and the low water content control can avoid the adverse effects of water on the anti-electro-corrosion performance, stability and lubrication effect of the oil.

[0016] Preferably, the filtration in step S5 uses a 500-800 mesh filter cloth and a filtration pressure of 0.3-0.5 MPa; after filtration, the product is left to stand for 12-24 hours, and the supernatant is taken as the anti-electro-corrosion engine oil for hybrid vehicles; the combination of 500-800 mesh filter cloth and specific filtration pressure can effectively remove tiny impurities in the system, and the standing process further promotes system stability, ensuring the purity and reliability of the finished oil.

[0017] The beneficial effects of this invention are: This invention provides an anti-electrochemical corrosion engine oil for hybrid vehicles and its preparation method. The invention uses a modified synthetic base oil as a carrier, compounded with modified anti-electrochemical corrosion composite agents, polylactic acid / polyurethane composite modifiers, and nano-modified fillers, among other functional components. Through a preparation method combining raw material pretreatment, stepwise compounding, ultrasonic dispersion, and precise process control, the invention achieves molecular-level compatibility and synergistic effects among the components. Compared with existing technologies, this invention effectively solves the problem of insufficient compatibility between the anti-electrochemical corrosion components and the base oil and functional modifiers. It achieves continuous and stable anti-electrochemical corrosion protection, good compatibility between oil film strength and viscosity, outstanding oxidation stability and anti-wear ability, and extended service life. It has broad application prospects in the field of lubrication protection for hybrid vehicle engines. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0019] Example 1: A method for preparing an anti-electro-corrosion engine oil for hybrid vehicles, comprising the following steps: P1. Preparation of modified synthetic base oil: α-olefin monomer (1-decene) and oxygen-containing monomer (methyl methacrylate) were weighed at a mass ratio of 8:1. A catalyst (boron trifluoride diethyl ether complex) accounting for 0.1% of the total monomer mass was added, and nitrogen gas was introduced to replace the air in the reactor. The reactor temperature was controlled at 80℃, pressure at 0.5MPa, and rotation speed at 200r / min, and the reaction was stirred for 4h to obtain the copolymer. The copolymer was transferred to a hydrogenation reactor, and a hydrogenation catalyst (palladium on carbon catalyst, palladium loading) accounting for 0.5% of its mass was added. 5%), hydrogenated at 120℃ and 2MPa hydrogen pressure for 3h; the hydrogenated product was then subjected to vacuum distillation (vacuum degree -0.09MPa, temperature 180℃) to remove light components, and then refined with clay (clay added at 3% of the product mass, stirred at 60℃ for 2h) to obtain polyα-olefin base oil; this base oil was mixed with an oxygen-containing base oil (polyethylene glycol dimethyl ether, molecular weight 200) at a mass ratio of 3:1 and stirred at 50℃ for 30min to obtain a modified synthetic base oil (kinematic viscosity 10mm at 40℃). 2 kinematic viscosity at 100℃ is 3 mm / s / s, and the kinematic viscosity at 100℃ 2 / s); P2. Preparation of modified anti-electro-corrosion composite: A nitrogen-containing heterocyclic compound (methylbenzotriazole, TTA) and a silane coupling agent (KH-560) were weighed at a mass ratio of 100:5. An appropriate amount of anhydrous ethanol was added as a solvent. The reaction vessel temperature was controlled at 40℃ and the rotation speed at 200 r / min. The mixture was stirred for 60 min to obtain the modified nitrogen-containing heterocyclic compound. An organic amine derivative (dodecylamine phosphate) was added at a mass ratio of 4:3, and the mixture was stirred for another 30 min. Then, a phosphorus-containing organic compound (tributyl phosphate, TBP) was added, and the mixture was heated to 60℃ and stirred for another 60 min. After the reaction was completed, the ethanol was removed by vacuum distillation at 80℃ and a vacuum degree of -0.08 MPa to obtain the modified anti-electro-corrosion composite. P3. Preparation of polylactic acid / polyurethane composite modifier: Polylactic acid polymers (poly-L-lactic acid, PLLA, number average molecular weight 50,000) and thermoplastic polyurethane (polyether-type aliphatic thermoplastic polyurethane, grade 1185A) were dried separately in a vacuum oven at 60℃ for 8 hours and pulverized to 80-100 mesh. The two dried powders were weighed at a mass ratio of 7:3 and added to a twin-screw extruder. Polyolefin grafted maleic anhydride (PP-g-MAH, grafting rate 1.5%) was added simultaneously, and the mass ratio of the three was controlled at 7:3:0.5. The extruder barrel temperature was 160℃ and the screw speed was 50 r / min. The mixture was melt-blended and granulated. The blended particles were vacuum dried at 70℃ for 6 hours and then pulverized to 120-150 mesh to obtain the polylactic acid / polyurethane composite modifier. P4. Preparation of nano-modified filler: Nano-inorganic filler (nano-silica, particle size 20nm) and clay (sodium montmorillonite, particle size 100nm) were mixed at a mass ratio of 3:1 and pulverized to 100-120 mesh to obtain a mixed powder; a 2% mass fraction ethanol solution of silane coupling agent (KH-560) was prepared, and the mixed powder and the solution were mixed at a mass ratio of 100:18 and added to a reaction vessel; the reaction vessel temperature was controlled at 55℃ and the rotation speed at 300r / min, and the reaction was stirred for 40min; after the reaction was completed, the mixture was filtered, washed twice with anhydrous ethanol, and dried in a vacuum oven at 75℃ for 3h to obtain the nano-modified filler; P5. Preparation of antioxidant: Weigh hindered phenol BHT and triphenyl phosphite at a mass ratio of 2:1, stir and mix evenly at room temperature to obtain the antioxidant; P6. Preparation of friction modifier: Weigh molybdenum disulfide and fatty acid ester at a mass ratio of 1:2, and disperse and stir evenly at room temperature to obtain friction modifier; P7. Preparation of metal passivating agent: benzotriazole and thiadiazole derivatives were weighed at a mass ratio of 3:1 and mixed evenly at room temperature to obtain the metal passivating agent; P8. Stabilizer preparation: Triethyl phosphate was selected as a stabilizer to ensure the long-term stability of the engine oil system and avoid unexpected reactions between components; P9. Raw material pretreatment: Take 60 parts of modified synthetic base oil, vacuum dehydrate at 100℃ for 2 hours, and cool to room temperature for later use; take 3 parts of nano-modified filler, add to anhydrous ethanol, and ultrasonically disperse at 300W and 20kHz for 15 minutes to obtain a uniform dispersion. P10. Preparation of the basic system: The pretreated modified synthetic base oil was added to a high-speed shear mill, and the temperature was controlled at 40℃ and the rotation speed at 1500r / min. 10 parts of modified anti-electro-corrosion composite agent and 0.5 parts of metal passivating agent were added in sequence. The mixture was sheared and mixed for 30min to obtain the mixed system. P11. Modified composite: Add 8 parts of polylactic acid / polyurethane composite modifier to the mixture, heat to 70℃, increase the rotation speed to 2500 r / min, and shear reaction for 60 min (system viscosity controlled at 1500 mPa·s); then add the uniformly dispersed nano-modified filler, and continue to disperse with ultrasonic assistance at 300W and 20kHz for 20 min. P12. Functional additive compounding: Cool the above system to 50℃, add 1 part antioxidant, 2 parts friction modifier and 1 part stabilizer, control the stirring speed to 1000 r / min, mix for 40 min, and keep the water content of the system below 0.1% during the process to obtain the compound system; P13. Post-treatment and finished product preparation: The compound system was placed in a vacuum environment of -0.08MPa and 60℃ for 30 min to degas; impurities were removed by filtration using a 500-800 mesh filter cloth under a pressure of 0.3MPa; the filtered product was allowed to stand for 12 h, and the supernatant was taken to obtain an anti-electro-corrosion engine oil for hybrid vehicles.

[0020] Example 2: A method for preparing an anti-electro-corrosion engine oil for hybrid vehicles, comprising the following steps: P1. Preparation of modified synthetic base oil: α-olefin monomer (1-decene) and oxygen-containing monomer (methyl methacrylate) were weighed at a mass ratio of 8:1. A catalyst (boron trifluoride diethyl ether complex) accounting for 0.1% of the total monomer mass was added, and nitrogen gas was introduced to replace the air in the reactor. The reactor temperature was controlled at 88℃, the pressure at 0.5MPa, and the rotation speed at 230r / min. The reaction was stirred for 4 hours to obtain the copolymer. The copolymer was transferred to a hydrogenation reactor, and a hydrogenation catalyst (palladium on carbon catalyst, palladium loading 5%) accounting for 0.5% of its mass was added. The product was hydrogenated at 130℃ and 2.3MPa for 3 hours. The hydrogenated product was then subjected to vacuum distillation (vacuum degree -0.09MPa, temperature 188℃) to remove light components, followed by clay refining (3% clay added, stirred at 66℃ for 2 hours) to obtain a polyalphaolefin base oil. This base oil was mixed with an oxygen-containing base oil (polyethylene glycol dimethyl ether, molecular weight 260) at a mass ratio of 3:1 and stirred at 53℃ for 33 minutes to obtain a modified synthetic base oil (kinematic viscosity 10 mmHg at 40℃). 2 kinematic viscosity at 100℃ is 3 mm / s / s, and the kinematic viscosity at 100℃ 2 / s); P2. Preparation of modified anti-electro-corrosion composite: A nitrogen-containing heterocyclic compound (methylbenzotriazole, TTA) and a silane coupling agent (KH-560) were weighed at a mass ratio of 100:6. An appropriate amount of anhydrous ethanol was added as a solvent. The reaction vessel temperature was controlled at 43℃ and the rotation speed at 230 r / min. The mixture was stirred for 70 min to obtain the modified nitrogen-containing heterocyclic compound. An organic amine derivative (dodecylamine phosphate) was added at a mass ratio of 4:3, and the mixture was stirred for another 33 min. Then, a phosphorus-containing organic compound (tributyl phosphate, TBP) was added, and the mixture was heated to 63℃ and stirred for 70 min. After the reaction was completed, the ethanol was removed by vacuum distillation at 83℃ and a vacuum degree of -0.08 MPa to obtain the modified anti-electro-corrosion composite. P3. Preparation of polylactic acid / polyurethane composite modifier: Polylactic acid polymers (poly-L-lactic acid, PLLA, number average molecular weight 60,000) and thermoplastic polyurethane (polyether-type aliphatic thermoplastic polyurethane, grade 1185A) were dried separately in a vacuum oven at 63℃ for 8 hours and pulverized to 80-100 mesh. The two dried powders were weighed at a mass ratio of 7:3 and added to a twin-screw extruder. Polyolefin grafted maleic anhydride (PP-g-MAH, grafting rate 1.5%) was added simultaneously, and the mass ratio of the three was controlled at 7:3:0.5. The extruder barrel temperature was 170℃ and the screw speed was 60 r / min. The mixture was melt-blended and granulated. The blended particles were vacuum dried at 73℃ for 6 hours and then pulverized to 120-150 mesh to obtain the polylactic acid / polyurethane composite modifier. P4. Preparation of nano-modified filler: Nano-inorganic filler (nano-silica, particle size 20nm) and clay (sodium montmorillonite, particle size 100nm) were mixed at a mass ratio of 3:1 and pulverized to 100-120 mesh to obtain a mixed powder; a 2% mass fraction ethanol solution of silane coupling agent (KH-560) was prepared, and the mixed powder and the solution were mixed at a mass ratio of 100:18 and added to a reaction vessel; the reaction vessel temperature was controlled at 55℃ and the rotation speed at 330r / min, and the reaction was stirred for 40min; after the reaction was completed, the mixture was filtered, washed twice with anhydrous ethanol, and dried in a vacuum oven at 75℃ for 3h to obtain the nano-modified filler; P5. Preparation of antioxidant: Weigh hindered phenol BHT and triphenyl phosphite at a mass ratio of 2:1, stir and mix evenly at room temperature to obtain the antioxidant; P6. Preparation of friction modifier: Weigh molybdenum disulfide and fatty acid ester at a mass ratio of 1:2, and disperse and stir evenly at room temperature to obtain friction modifier; P7. Preparation of metal passivating agent: benzotriazole and thiadiazole derivatives were weighed at a mass ratio of 3:1 and mixed evenly at room temperature to obtain the metal passivating agent; P8. Stabilizer preparation: Triethyl phosphate was selected as a stabilizer to ensure the long-term stability of the engine oil system and avoid unexpected reactions between components; P9. Raw material pretreatment: Take 70 parts of modified synthetic base oil, dehydrate it under vacuum at 100℃ for 2 hours, and cool it to room temperature for later use; take 5 parts of nano-modified filler, add it to anhydrous ethanol, and disperse it by ultrasonication at 300W and 20kHz for 15 minutes to obtain a uniform dispersion. P10. Preparation of the basic system: The pretreated modified synthetic base oil was added to a high-speed shear mill, and the temperature was controlled at 43℃ and the rotation speed at 1500r / min. 13 parts of modified anti-electro-corrosion composite agent and 1 part of metal passivating agent were added in sequence. The mixture was sheared and mixed for 33min to obtain the mixed system. P11. Modified composite: Add 15 parts of polylactic acid / polyurethane composite modifier to the mixture, heat to 73℃, increase the rotation speed to 2700 r / min, and shear reaction for 70 min (system viscosity controlled at 1500 mPa·s); then add the uniformly dispersed nano-modified filler, and continue to disperse with ultrasonic assistance at 300W and 20kHz for 23 min. P12. Functional additive compounding: Cool the above system to 53℃, add 2 parts antioxidant, 4 parts friction modifier and 1 part stabilizer, control the stirring speed to 1000 r / min, mix for 40 min, and keep the water content of the system below 0.1% during the process to obtain the compound system; P13. Post-treatment and finished product preparation: The compound system was placed in a vacuum environment of -0.08MPa and 63℃ for 30 min to degas; impurities were removed by filtration using a 500-800 mesh filter cloth at a pressure of 0.3MPa; the filtered product was allowed to stand for 15 h, and the supernatant was taken to obtain an anti-electro-corrosion engine oil for hybrid vehicles.

[0021] Example 3: A method for preparing an anti-electro-corrosion engine oil for hybrid vehicles, comprising the following steps: P1. Preparation of modified synthetic base oil: α-olefin monomer (1-decene) and oxygen-containing monomer (methyl methacrylate) were weighed at a mass ratio of 9:1. A catalyst (boron trifluoride diethyl ether complex) accounting for 0.3% of the total monomer mass was added, and nitrogen gas was introduced to replace the air in the reactor. The reactor temperature was controlled at 96℃, pressure at 1.0MPa, and rotation speed at 260r / min, and the reaction was stirred for 5h to obtain the copolymer. The copolymer was transferred to a hydrogenation reactor, and a hydrogenation catalyst (palladium on carbon catalyst, palladium loading 5%) accounting for 1.0% of its mass was added. The product was hydrogenated at 140℃ and 2.6MPa for 4 hours. The hydrogenated product was then subjected to vacuum distillation (vacuum degree -0.08MPa, temperature 196℃) to remove light components, followed by refining with clay (clay added at 4% of the product mass, stirred at 72℃ for 2 hours) to obtain a polyalphaolefin base oil. This base oil was mixed with an oxygen-containing base oil (polyethylene glycol dimethyl ether, molecular weight 320) at a mass ratio of 4:1 and stirred at 56℃ for 36 minutes to obtain a modified synthetic base oil (kinematic viscosity 15 mmHg at 40℃).2 kinematic viscosity at 100℃ (5mm / s) / s 2 / s); P2. Preparation of modified anti-electro-corrosion composite: A nitrogen-containing heterocyclic compound (methylbenzotriazole, TTA) and a silane coupling agent (KH-560) were weighed at a mass ratio of 100:7. An appropriate amount of anhydrous ethanol was added as a solvent. The reaction vessel temperature was controlled at 46℃ and the rotation speed at 260 r / min. The mixture was stirred for 80 min to obtain the modified nitrogen-containing heterocyclic compound. An organic amine derivative (dodecylamine phosphate) was added at a mass ratio of 5:4, and the mixture was stirred for another 36 min. Then, a phosphorus-containing organic compound (tributyl phosphate, TBP) was added, and the mixture was heated to 66℃ and stirred for 80 min. After the reaction was completed, the ethanol was removed by vacuum distillation at 86℃ and a vacuum degree of -0.07 MPa to obtain the modified anti-electro-corrosion composite. P3. Preparation of polylactic acid / polyurethane composite modifier: Polylactic acid polymers (poly-L-lactic acid, PLLA, number average molecular weight 70,000) and thermoplastic polyurethane (polyether-type aliphatic thermoplastic polyurethane, grade 1185A) were dried separately in a vacuum oven at 66℃ for 9 hours and pulverized to 80-100 mesh. The two dried powders were weighed at a mass ratio of 7:3 and added to a twin-screw extruder. Polyolefin grafted maleic anhydride (PP-g-MAH, grafting rate 2.5%) was added simultaneously, and the mass ratio of the three was controlled at 7:3:1. The extruder barrel temperature was 180℃ and the screw speed was 70 r / min. The mixture was melt-blended and granulated. The blended particles were vacuum dried at 76℃ for 7 hours and then pulverized to 120-150 mesh to obtain the polylactic acid / polyurethane composite modifier. P4. Preparation of nano-modified filler: Nano-inorganic filler (nano-silica, particle size 40nm) and clay (sodium montmorillonite, particle size 200nm) were mixed at a mass ratio of 4:1 and pulverized to 100-120 mesh to obtain a mixed powder; a 3% mass fraction ethanol solution of silane coupling agent (KH-560) was prepared, and the mixed powder and the solution were mixed at a mass ratio of 100:20 and added to a reaction vessel; the reaction vessel temperature was controlled at 60℃ and the rotation speed at 360r / min, and the reaction was stirred for 60min; after the reaction was completed, the mixture was filtered, washed 3 times with anhydrous ethanol, and dried in a vacuum oven at 80℃ for 4h to obtain the nano-modified filler; P5. Preparation of antioxidant: Weigh hindered phenol BHT and triphenyl phosphite at a mass ratio of 3:1, stir and mix evenly at room temperature to obtain the antioxidant; P6. Preparation of friction modifier: Weigh molybdenum disulfide and fatty acid ester at a mass ratio of 1:3, and disperse and stir evenly at room temperature to obtain friction modifier; P7. Preparation of metal passivating agent: benzotriazole and thiadiazole derivatives were weighed at a mass ratio of 4:1 and mixed evenly at room temperature to obtain the metal passivating agent; P8. Stabilizer preparation: Triethyl phosphate was selected as a stabilizer to ensure the long-term stability of the engine oil system and avoid unexpected reactions between components; P9. Raw material pretreatment: Take 90 parts of modified synthetic base oil, vacuum dehydrate at 110℃ for 3h, and cool to room temperature for later use; take 6 parts of nano-modified filler, add to anhydrous ethanol, and ultrasonically disperse at 400W and 30kHz for 18min to obtain a uniform dispersion. P10. Preparation of the basic system: The pretreated modified synthetic base oil was added to a high-speed shear mill, and the temperature was controlled at 46℃ and the rotation speed at 1800r / min. 16 parts of modified anti-electro-corrosion composite agent and 1.5 parts of metal passivating agent were added in sequence, and the mixture was sheared and mixed for 36min to obtain the mixed system. P11. Modification and Composite: Add 18 parts of polylactic acid / polyurethane composite modifier to the mixture, heat to 76℃, increase the rotation speed to 2900 r / min, and shear reaction for 80 min (system viscosity controlled at 2000 mPa·s); then add the uniformly dispersed nano-modified filler and continue to disperse with ultrasonic assistance at 400 W and 30 kHz for 26 min. P12. Functional additive compounding: Cool the above system to 56℃, add 3 parts antioxidant, 5 parts friction modifier and 2 parts stabilizer, control the stirring speed to 1200 r / min, mix for 50 min, and keep the water content of the system below 0.1% during the process to obtain the compound system; P13. Post-treatment and finished product preparation: The compound system was degassed for 45 minutes in an environment with a vacuum degree of -0.06MPa and a temperature of 66℃; impurities were removed by filtration using a 500-800 mesh filter cloth under a pressure of 0.5MPa; the filtered product was allowed to stand for 20 hours, and the supernatant was taken to obtain an anti-electro-corrosion engine oil for hybrid vehicles.

[0022] Example 4: A method for preparing an anti-electro-corrosion engine oil for hybrid vehicles, comprising the following steps: P1. Preparation of modified synthetic base oil: α-olefin monomer (1-decene) and oxygen-containing monomer (methyl methacrylate) were weighed at a mass ratio of 10:1. A catalyst (boron trifluoride diethyl ether complex) accounting for 0.3% of the total monomer mass was added, and nitrogen gas was introduced to replace the air in the reactor. The reactor temperature was controlled at 100℃, pressure at 1.0MPa, and rotation speed at 300r / min, and the reaction was stirred for 6h to obtain the copolymer. The copolymer was transferred to a hydrogenation reactor, and a hydrogenation catalyst (palladium on carbon catalyst, palladium supported) accounting for 1.0% of its mass was added. A 5% hydrogen-containing base oil was hydrogenated at 150°C and 3 MPa for 5 hours. The hydrogenated product was then subjected to vacuum distillation (0.08 MPa, 200°C) to remove light components, followed by clay refining (5% clay added, stirred at 80°C for 2 hours) to obtain a polyalphaolefin base oil. This base oil was then mixed with an oxygen-containing base oil (polyethylene glycol dimethyl ether, molecular weight 400) at a mass ratio of 5:1 and stirred at 60°C for 40 minutes to obtain a modified synthetic base oil (kinematic viscosity 15 mmHg at 40°C). 2 kinematic viscosity at 100℃ (5mm / s) / s 2 / s); P2. Preparation of modified anti-electro-corrosion composite: A nitrogen-containing heterocyclic compound (methylbenzotriazole, TTA) and a silane coupling agent (KH-560) were weighed at a mass ratio of 100:8. An appropriate amount of anhydrous ethanol was added as a solvent. The reaction vessel temperature was controlled at 50℃ and the rotation speed at 300 r / min. The mixture was stirred for 90 min to obtain the modified nitrogen-containing heterocyclic compound. An organic amine derivative (dodecylamine phosphate) was added at a mass ratio of 6:5, and the mixture was stirred for another 40 min. Then, a phosphorus-containing organic compound (tributyl phosphate, TBP) was added, and the mixture was heated to 70℃ and stirred for another 90 min. After the reaction was completed, the ethanol was removed by vacuum distillation at 90℃ and a vacuum degree of -0.07 MPa to obtain the modified anti-electro-corrosion composite. P3. Preparation of polylactic acid / polyurethane composite modifier: Polylactic acid polymers (poly-L-lactic acid, PLLA, number average molecular weight 80,000) and thermoplastic polyurethane (polyether-type aliphatic thermoplastic polyurethane, grade 1185A) were dried separately in a vacuum oven at 70℃ for 10h and pulverized to 80-100 mesh; the two dried powders were weighed at a mass ratio of 7:3 and added to a twin-screw extruder, and polyolefin-grafted maleic anhydride (PP-g-MAH, grafting rate 2.5%) was added simultaneously, controlling the mass ratio of the three to be 7:3:1.2, the extruder barrel temperature was 195℃ and the screw speed was 80r / min, and the mixture was melt-blended and granulated; the blended particles were vacuum dried at 80℃ for 8h and then pulverized to 120-150 mesh to obtain the polylactic acid / polyurethane composite modifier; P4. Preparation of nano-modified filler: Nano-inorganic filler (nano-silica, particle size 40nm) and clay (sodium montmorillonite, particle size 200nm) were mixed at a mass ratio of 4:1 and pulverized to 100-120 mesh to obtain a mixed powder; a 3% mass fraction ethanol solution of silane coupling agent (KH-560) was prepared, and the mixed powder and the solution were mixed at a mass ratio of 100:22 and added to a reaction vessel; the reaction vessel temperature was controlled at 65℃ and the rotation speed at 400r / min, and the reaction was stirred for 60min; after the reaction was completed, the mixture was filtered, washed 3 times with anhydrous ethanol, and dried in a vacuum oven at 85℃ for 4h to obtain the nano-modified filler; P5. Preparation of antioxidant: Weigh hindered phenol BHT and triphenyl phosphite at a mass ratio of 3:1, stir and mix evenly at room temperature to obtain the antioxidant; P6. Preparation of friction modifier: Weigh molybdenum disulfide and fatty acid ester at a mass ratio of 1:3, and disperse and stir evenly at room temperature to obtain friction modifier; P7. Preparation of metal passivating agent: benzotriazole and thiadiazole derivatives were weighed at a mass ratio of 4:1 and mixed evenly at room temperature to obtain the metal passivating agent; P8. Stabilizer preparation: Triethyl phosphate was selected as a stabilizer to ensure the long-term stability of the engine oil system and avoid unexpected reactions between components; P9. Raw material pretreatment: Take 90 parts of modified synthetic base oil, vacuum dehydrate at 110℃ for 3h, and cool to room temperature for later use; take 8 parts of nano-modified filler, add to anhydrous ethanol, and ultrasonically disperse at 500W and 40kHz for 20min to obtain a uniform dispersion. P10. Preparation of the basic system: The pretreated modified synthetic base oil was added to a high-speed shear mill, and the temperature was controlled at 50℃ and the rotation speed at 2000r / min. 20 parts of modified anti-electro-corrosion composite agent and 2 parts of metal passivating agent were added in sequence. The mixture was sheared and mixed for 40min to obtain the mixed system. P11. Modification and Composite: Add 20 parts of polylactic acid / polyurethane composite modifier to the mixture, heat to 80℃, increase the rotation speed to 3000 r / min, and shear reaction for 90 min (system viscosity controlled at 2500 mPa·s); then add the uniformly dispersed nano-modified filler, and continue to disperse with ultrasonic assistance at 500W and 40kHz for 30 min. P12. Functional additive compounding: Cool the above system to 60℃, add 4 parts antioxidant, 6 parts friction modifier and 3 parts stabilizer, control the stirring speed to 1500r / min, mix for 60min, and keep the water content of the system below 0.1% during the process to obtain the compound system; P13. Post-treatment and finished product preparation: The compound system was degassed for 45 minutes in an environment with a vacuum degree of -0.06MPa and a temperature of 70℃; impurities were removed by filtration using a 500-800 mesh filter cloth under a pressure of 0.5MPa; the filtered product was allowed to stand for 24 hours, and the supernatant was taken to obtain an anti-electro-corrosion engine oil for hybrid vehicles.

[0023] Comparative Example 1: Compared with Example 1, this comparative example did not add polylactic acid / polyurethane composite modifier, and all other steps and parameters were the same. This comparative example will not be repeated here. Finally, an anti-electro-corrosion engine oil for hybrid vehicles was obtained.

[0024] Comparative Example 2: Compared with Example 1, this comparative example only replaces the "modified anti-electro-corrosion composite agent" with "a mixture of unmodified benzotriazole and dodecylamine phosphate directly mixed at a mass ratio of 4:3". All other steps and parameters are the same, and will not be repeated in this comparative example. Finally, an anti-electro-corrosion engine oil for hybrid vehicles is obtained.

[0025] Comparative Example 3: Compared with Example 1, this comparative example did not modify the nanofiller with silane coupling agent (KH-560). All other steps and parameters were the same, and will not be repeated here. The final product is an anti-electro-corrosion engine oil for hybrid vehicles.

[0026] Comparative Example 4: Compared with Example 1, this comparative example only replaces "polyolefin grafted maleic anhydride (PP-g-MAH) in polylactic acid / polyurethane composite modifier" with "ungrafted polyolefin elastomer (POE)". All other steps and parameters are the same, and will not be repeated in this comparative example. Finally, an anti-electro-corrosion engine oil for hybrid vehicles is obtained.

[0027] Comparative Example 5: Compared with Example 1, this comparative example only replaces "the mass ratio of polyalphaolefin base oil to oxygen-containing base oil in the modified synthetic base oil is 3:1" with "the mass ratio of polyalphaolefin base oil to oxygen-containing base oil in the modified synthetic base oil is 1:1". All other steps and parameters are the same, and will not be repeated in this comparative example. The final product is an anti-electrochemical corrosion engine oil for hybrid vehicles.

[0028] Comparative Example 6: Compared with Example 1, this comparative example did not use the "nano-modified filler ultrasonic dispersion" step in the raw material pretreatment. All other steps and parameters were the same, and will not be repeated here. The final product is an anti-electro-corrosion engine oil for hybrid vehicles.

[0029] Comparative Example 7: Compared with Example 1, this comparative example only replaces "polylactic acid (PLLA, number average molecular weight 50,000)" with "low molecular weight polylactic acid with a number average molecular weight of 20,000". All other steps and parameters are the same, and will not be repeated in this comparative example. Finally, an anti-electro-corrosion engine oil for hybrid vehicles is obtained.

[0030] Performance testing: Test method: Breakdown voltage (resistance to electro-corrosion): Tested using a BDJC-1 type lubricating oil breakdown voltage tester, with a sample volume of 50mL, an electrode spacing of 2.5mm, and a voltage rise rate of 2kV / s; Kinematic viscosity at 40℃: Tested using an NDJ-8S digital rotational viscometer (rotor No. 4). The sample needs to be kept at a constant temperature of 40℃ for 30 minutes. Kinematic viscosity at 100℃: Tested using an NDJ-8S digital rotational viscometer (rotor No. 4). The sample needs to be kept at a constant temperature of 100℃ for 30 minutes. Oxidation induction period (oxidation stability): The DSC-30 differential scanning calorimeter was used to test the sample. The sample amount was 5 mg, which was placed in an aluminum sealed crucible and heated to 180 °C at a rate of 10 °C / min. The oxygen flow rate was 50 mL / min. Friction coefficient (lubrication performance): Tested using MMW-1 type four-ball friction and wear tester, steel ball material GCr15, diameter 12.7mm, hardness HRC62-66, load 392N, rotation speed 1450r / min, test temperature 75℃, test duration 30min; Metal corrosion degree: Tested using a copper strip corrosion tester. The copper strip size is 25mm×3mm×0.5mm (purity ≥99.9%), and it is immersed in a constant temperature oil bath at 100℃ for 3 hours. Viscosity index: Calculated based on kinematic viscosity data at 40℃ and 100℃, with reference to GB / T12580-2018 standard; Pour point (low temperature adaptability): Tested using a DP-01 automatic pour point tester, with a sample volume of 50 mL, an initial cooling rate of 10 °C / min, which was changed to 1 °C / min when approaching the expected pour point, a tilt angle of 45 °C, and a holding time of 5 s.

[0031] The test results are shown in Tables 1-3 below: Table 1 Performance test results of Examples 1-4 Table 2 Performance test results of Comparative Examples 1-4 Table 3 Performance test results of Comparative Examples 5-7 Data Analysis: As shown in Table 1, the anti-electro-corrosion engine oil for hybrid vehicles prepared by this invention exhibits outstanding performance in anti-electro-corrosion properties, viscosity stability, and long-term lubrication performance. This is primarily due to the design logic of "multi-component synergistic modification + precise process control": the breakdown voltage exceeds 38.6kV, and the kinematic viscosity at 40℃ / 100℃ is adapted to engine operating conditions (11.2-14.6 / 3.2-4.8mm). 2 With an oxidation induction period exceeding 186 minutes and a friction coefficient ≤0.082, it not only meets the anti-electrochemical corrosion protection requirements of hybrid vehicle engines but also ensures lubrication stability during long-term use.

[0032] The superior performance of Examples 3 and 4 is essentially due to the precise matching of raw material ratios and process parameters: On the one hand, the ratio of methylbenzotriazole (TTA, metal adsorption), dodecylamine phosphate (interface passivation), and tributyl phosphate (TBP, synergistic corrosion resistance) in the modified anti-electro-corrosion composite agent is optimized to 5:4:2 and 6:5:4, forming an "adsorption-passivation-synergistic" protection system that enhances the density of the protective layer on the metal surface; on the other hand, the ratio of PLLA (number average molecular weight 70,000-80,000), polyether-type TPU (grade 1185A), and PP-g-MAH (grafting rate 2.5%) in the polylactic acid / polyurethane composite modifier is stable at 7:3:1-1.2. The improved compatibility enhances component compatibility and reduces performance degradation. The ratio of polyalphaolefin to polyethylene glycol dimethyl ether (molecular weight 320-400) in the modified synthetic base oil is adjusted to 4:1-5:1, resulting in a viscosity index exceeding 148. On the other hand, the precise control of ultrasonic dispersion (300-500W / 20-40kHz), stepwise compounding (base system-modifier-functional additive), and post-treatment degassing (-0.06--0.08MPa / 60-70℃) of the nano-modified filler reduces component agglomeration and system bubbles, further improving the uniformity of anti-electrode corrosion and lubrication continuity, ultimately resulting in a breakdown voltage exceeding 42.8kV and an oxidation induction period exceeding 215min.

[0033] In contrast, Comparative Example 1, due to the absence of polylactic acid / polyurethane composite modifier, resulted in insufficient interfacial compatibility between the modified synthetic base oil and the anti-electro-corrosion composite agent and nanofiller. This led to the disruption of the continuity of the anti-electro-corrosion protective layer, a decrease in breakdown voltage to 30.5 kV, a shortening of the oxidation induction period to 132 min, an increase in the degree of metal corrosion to level 3, and an increase in the coefficient of friction to 0.115. Comparative Example 2, due to the use of unmodified anti-electro-corrosion components (a mixture of benzotriazole and dodecylamine phosphate without silane coupling agent modification), the components were unevenly dispersed in the base oil, the distribution of anti-electro-corrosion active sites was unbalanced, the breakdown voltage was only 28.7 kV, the oxidation induction period was reduced to 128 min, and the friction coefficient increased to 0.123. In Comparative Example 3, because the nanofiller was not modified by silane coupling agent (KH-560), the nano-inorganic filler and sodium-based montmorillonite were prone to agglomeration in the oil, and could not form a uniform reinforcing network. The breakdown voltage dropped to 32.1kV, the pour point deteriorated to -17℃, and the coefficient of friction increased to 0.108. In Comparative Example 4, because ungrafted polyolefin elastomer (POE) was used instead of polyolefin grafted maleic anhydride (PP-g-MAH), polylactic acid and thermoplastic polyurethane could not achieve molecular-level compatibility, the dispersibility of the composite modifier decreased, the breakdown voltage dropped to 33.6 kV, and the oxidation induction period was shortened to 152 min. In Comparative Example 5, because the mass ratio of polyalphaolefin base oil to oxygen-containing base oil in the modified synthetic base oil was changed to 1:1, the viscosity compatibility of the base oil was disrupted, and the kinematic viscosity at 40°C decreased to 8.6 mm. 2 / s, viscosity index drops to 125, pour point deteriorates to -16℃; In Comparative Example 6, due to the omission of the ultrasonic dispersion step of the nano-modified filler in the raw material pretreatment, the nano-filler agglomeration phenomenon was severe, the anti-electro-corrosion component was unevenly distributed, the breakdown voltage dropped to 30.2kV, the metal corrosion degree increased to level 3, and the friction coefficient increased to 0.121. In Comparative Example 7, due to the use of low molecular weight polylactic acid with a number average molecular weight of 20,000 instead of polylactic acid with a number average molecular weight of 50,000-80,000, the polylactic acid / polyurethane composite modifier had insufficient structural stability and could not maintain component compatibility for a long time. The breakdown voltage dropped to 34.3kV and the oxidation induction period was shortened to 158min.

[0034] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0035] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An anti-electro-corrosion engine oil for hybrid vehicles, characterized in that, It is prepared from the following raw materials in parts by weight: 60-90 parts modified synthetic base oil, 10-20 parts modified anti-electrostatic corrosion composite agent, 8-20 parts polylactic acid / polyurethane composite modifier, 3-8 parts nano-modified filler, 1-4 parts antioxidant, 2-6 parts friction modifier, 0.5-2 parts metal passivator, and 1-3 parts stabilizer. The modified synthetic base oil is a blend of polyalphaolefin base oil and oxygen-containing base oil in a mass ratio of 3-5:1; The modified anti-electro-corrosion composite agent is prepared by nitrogen-containing heterocyclic compounds, organic amine derivatives and phosphorus-containing organic compounds in a mass ratio of 4-6:3-5:2-4; The polylactic acid / polyurethane composite modifier is prepared by compatibilizing and modifying polylactic acid polymers and thermoplastic polyurethanes with maleic anhydride grafted onto polyolefins, wherein the mass ratio of polylactic acid polymers: thermoplastic polyurethanes: polyolefin-grafted maleic anhydride is 7:3:0.5-1.

2. The nano-modified filler is a silane coupling agent modified nano-inorganic filler / clay composite filler, and the mass ratio of the nano-inorganic filler to the clay is 3-4:

1.

2. The anti-electro-corrosion engine oil for hybrid vehicles according to claim 1, characterized in that, The modified synthetic base oil has a kinematic viscosity of 10-15 mm at 40°C. 2 kinematic viscosity at 100℃ is 3-5 mm / s. 2 / s; the nitrogen-containing heterocyclic compound is a benzotriazole derivative, the organic amine derivative is an organic amine salt, and the phosphorus-containing organic compound is a phosphate ester; the polylactic acid polymer is polylactic acid, the thermoplastic polyurethane is an aliphatic thermoplastic polyurethane; the silane coupling agent is an epoxy silane coupling agent, the nano-inorganic filler is nano-silica, and the clay is sodium-based montmorillonite.

3. The anti-electro-corrosion engine oil for hybrid vehicles according to claim 1, characterized in that, The method for preparing the modified synthetic base oil is as follows: Step D1. Weigh α-olefin monomer and oxygen-containing monomer at a mass ratio of 8-10:1, add them to the reaction vessel, and add catalyst accounting for 0.1%-0.3% of the total mass of monomers. Then, purge the air in the vessel with nitrogen. Step D2. Control the reactor temperature to 80-100℃, pressure to 0.5-1.0MPa, and rotation speed to 200-300r / min, and stir the reaction for 4-6 hours to obtain the copolymer product; Step D3. Transfer the copolymer to a hydrogenation reactor, add 0.5%-1.0% hydrogenation catalyst by mass of the copolymer, control the temperature at 120-150℃ and the hydrogen pressure at 2-3MPa, and perform the hydrogenation reaction for 3-5 hours. Step D4. The hydrogenated product is subjected to vacuum distillation to remove light components, and then refined with clay to obtain polyalphaolefin base oil; Step D5. Mix poly-α-olefin base oil and oxygen-containing base oil at a mass ratio of 3-5:1, and stir at 50-60℃ for 30-40 minutes to obtain modified synthetic base oil.

4. The anti-electro-corrosion engine oil for hybrid vehicles according to claim 1, characterized in that, The preparation method of the polylactic acid / polyurethane composite modifier is as follows: Step A1. Dry polylactic acid polymers and thermoplastic polyurethanes separately in a vacuum oven at 60-70℃ for 8-10 hours, and pulverize them to 80-100 mesh to obtain dried polylactic acid polymer powder and thermoplastic polyurethane powder. Step A2. Weigh dry polylactic acid polymer powder and thermoplastic polyurethane powder at a mass ratio of 7:3, add them to a twin-screw extruder, and simultaneously add polyolefin-grafted maleic anhydride. Control the extruder barrel temperature at 160-195℃ and the screw speed at 50-80 r / min, and melt-blend and granulate. Step A3. Dry the blended particles under vacuum at 70-80℃ for 6-8 hours, and pulverize them to 120-150 mesh to obtain polylactic acid / polyurethane composite modifier.

5. The anti-electro-corrosion engine oil for hybrid vehicles according to claim 1, characterized in that, The preparation method of the nano-modified filler is as follows: Step B1. Mix the nano-inorganic filler with clay at a mass ratio of 3-4:1, and pulverize to 100-120 mesh to obtain a mixed powder; Step B2. Prepare a 2%-3% (w / w) silane coupling agent ethanol solution. Mix the mixed powder with the silane coupling agent ethanol solution at a mass ratio of 100:18-22 and add it to the reaction vessel. Step B3. Control the reactor temperature to 55-65℃ and the rotation speed to 300-400 r / min, and stir the reaction for 40-60 min; Step B4. After the reaction is complete, filter the mixture, wash it 2-3 times with anhydrous ethanol, and dry it in a vacuum oven at 75-85℃ for 3-4 hours to obtain the nano-modified filler. The nano-inorganic filler has a particle size of 20-40 nm, and the clay has a particle size of 100-200 nm.

6. The anti-electro-corrosion engine oil for hybrid vehicles according to claim 1, characterized in that, The preparation method of the modified anti-electro-corrosion composite agent is as follows: Step C1. Weigh the nitrogen-containing heterocyclic compound and silane coupling agent at a mass ratio of 100:5-8, add them to the reaction vessel, add anhydrous ethanol as solvent, control the temperature at 40-50℃ and the rotation speed at 200-300 r / min, stir the reaction for 60-90 min, and obtain the modified nitrogen-containing heterocyclic compound. Step C2. Weigh the modified nitrogen-containing heterocyclic compound and the organic amine derivative at a mass ratio of 4-6:3-5, add them to the reaction vessel, and continue stirring for 30-40 minutes; Step C3. Add a phosphorus-containing organic compound to the reaction vessel, heat to 60-70℃, and continue stirring for 60-90 minutes. Step C4. After the reaction is complete, remove the ethanol by vacuum distillation at 80-90℃ to obtain the modified anti-electro-corrosion composite agent.

7. The method for preparing an anti-electro-corrosion engine oil for hybrid vehicles according to any one of claims 1-6, characterized in that, Includes the following steps: Step S1. Raw material pretreatment: The modified synthetic base oil is vacuum dehydrated at 100-110℃ for 2-3 hours and cooled to room temperature for later use; the nano-modified filler is added to anhydrous ethanol and ultrasonically dispersed for 15-20 minutes to obtain a uniform dispersion. Step S2. Preparation of basic system: Add the uniformly dispersed liquid to a high-speed shear mill, control the temperature at 40-50℃ and the rotation speed at 1500-2000 r / min, add the modified anti-electro-corrosion composite agent and the metal passivating agent in sequence, and shear and mix for 30-40 min to obtain the mixed system; Step S3. Modification and Composite: Add polylactic acid / polyurethane composite modifier to the mixture, heat to 70-80℃, increase rotation speed to 2500-3000 r / min, and shear reaction for 60-90 min; then add nano-modified filler and ultrasonically disperse for 20-30 min; Step S4. Functional additive compounding: Cool to 50-60℃, add antioxidant, friction modifier and stabilizer, stir and mix for 40-60min to obtain the cooled solvent; Step S5. Post-treatment: Degas the cooled solvent at a vacuum of -0.08 to -0.06 MPa and a temperature of 60 to 70°C for 30 to 45 minutes, filter to remove impurities, and obtain an anti-electro-corrosion engine oil for hybrid vehicles.

8. The method for preparing the anti-electro-corrosion engine oil for hybrid vehicles according to claim 7, characterized in that, The ultrasonic-assisted dispersion in step S3 has a power of 300-500W and an ultrasonic frequency of 20-40kHz; after the polylactic acid / polyurethane composite modifier is added, the viscosity of the system is controlled at 1500-2500mPa·s.

9. The method for preparing the anti-electro-corrosion engine oil for hybrid vehicles according to claim 7, characterized in that, The stirring speed in step S4 is 1000-1500 r / min, and the water content of the system is controlled below 0.1% during the mixing process.

10. The method for preparing the anti-electro-corrosion engine oil for hybrid vehicles according to claim 7, characterized in that, The filtration in step S5 uses a 500-800 mesh filter cloth and a filtration pressure of 0.3-0.5 MPa. After filtration, the product is left to stand for 12-24 hours, and the clear liquid at the top is taken as the anti-electro-corrosion engine oil for hybrid vehicles.

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