Electric automobile axle gear oil and production process thereof

Abstract

The invention relates to the technical field of lubricating oil, in particular to electric automobile axle gear oil and a production process thereof. The gear oil is prepared from the following raw materials in parts by weight: 90 to 110 parts of base oil, 0.5 to 1.2 parts of N, N-di-n-butylamino toluylene triazole, 9 to 12 parts of a viscosity modifier, 10 to 15 parts of polyol ester, 1 to 3 parts of a pour point depressant, 1 to 2 parts of a compound antioxidant, 1.5 to 2.5 parts of a demulsifying agent, 0.8 to 1.5 parts of an anti-rust agent, 3 to 6 parts of an anti-wear reagent at extreme pressure, 0.2 to 0.6 part of a de-foaming agent and 5 to 8 parts of a functional additive, the gear oil produced by the invention not only has excellent high-temperature resistance, wear resistance and antifriction performance, but also has good oxidation resistance, the wear degree of an axle gear is reduced to a certain extent, the service life of the gear oil is prolonged, the service life of the axle gear is also prolonged, and the service life of the axle gear is prolonged. And the grade and the quality of the gear oil are effectively ensured.

Description

Technical Field

[0001] The invention relates to the technical field of lubricating oil, and in particular to an electric vehicle axle gear oil and a production process thereof. Background Art

[0002] Gear oil is a kind of lubricant made of petroleum lubricant base oil or synthetic lubricant, with extreme pressure anti-wear agent and oiliness agent added. It mainly plays the role of lubricating gears and bearings, preventing wear and corrosion, and helping gears to dissipate heat. It is used in various gear transmission devices to extend their service life and improve the transmission power efficiency.

[0003] Due to the vigorous development of new energy vehicles, electric motors have gradually replaced traditional fuel engines, so the demand for lubricating oil has been greatly reduced. However, due to the higher sealing requirements of the front and rear axles of new energy vehicles, the requirements for gear oil have also gradually increased. It requires not only that the gear oil has excellent wear resistance, but also that it has excellent antioxidant properties. In the patent document with application number "CN201811274622.8", a special gear oil for ultra-low temperature subway and its preparation method are disclosed, which belong to the field of motor oil. The gear oil contains the following components in mass percentage: base oil 70-80%, alkyl naphthalene 5-15%, polyol ester 10-20%, pour point depressant 0.3-2%, antioxidant 0.5-1.5%, and compounding agent 1-10%, wherein the base oil is composed of poly-α-olefin base oil and ester base oil, and the poly-α-olefin base oil accounts for 60-75% of the total base oil, and the ester base oil includes dioctyl sebacate and polymethacrylate, which account for 20-30% and 5-15% of the total base oil, respectively.

[0004] Although the gear oil prepared by the above patent document has excellent low temperature resistance and can meet the use requirements of subway vehicles in cold regions such as Northwest and Northeast my country, its wear resistance and friction reduction performance is relatively insufficient, which will aggravate the wear of the axle gear and shorten its service life. Furthermore, its antioxidant performance is also relatively insufficient, which will accelerate the oxidation and deterioration of the gear oil, produce sludge and sediment, affect the lubrication effect and shorten the service life of the axle gear. Therefore, the present invention provides an electric vehicle axle gear oil and a production process thereof to solve the above-mentioned technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide an electric vehicle axle gear oil and a production process thereof. The gear oil produced not only has excellent high temperature resistance and wear resistance and friction reduction performance, but also has good antioxidant performance, which reduces the wear degree of the axle gear to a certain extent, prolongs the service life of the gear oil and also prolongs the service life of the axle gear, effectively ensuring the grade and quality of the gear oil.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An electric vehicle axle gear oil, the gear oil is composed of the following raw materials in parts by weight: 90-110 parts of base oil, 0.5-1.2 parts of N,N-di-n-butylaminotoluenetriazole, 9-12 parts of viscosity modifier, 10-15 parts of polyol ester, 1-3 parts of pour point depressant, 1-2 parts of compound antioxidant, 1.5-2.5 parts of anti-emulsifier, 0.8-1.5 parts of rust inhibitor, 3-6 parts of extreme pressure anti-wear agent, 0.2-0.6 parts of defoamer and 5-8 parts of functional additives;

[0008] The pour point depressant is prepared by compounding alkyl naphthalene and acrylic acid polymer in a mass ratio of 1:1 to 2; the compound antioxidant is prepared by compounding phenolic antioxidant and amine antioxidant in a mass ratio of 1:1 to 1.5;

[0009] The acrylic polymer is selected from polymethacrylate 1-368 or polymethacrylate LZ 7749B;

[0010] The phenolic antioxidant is selected from antioxidant BHT or antioxidant 1010;

[0011] The amine antioxidant is 4,4'-dioctyl diphenylamine or butyl octylated diphenylamine;

[0012] The anti-emulsifier is anti-emulsifier D114 or anti-emulsifier T1001;

[0013] The rust inhibitor is benzotriazole or barium dinonylnaphthalenesulfonate;

[0014] The extreme pressure anti-wear agent is any one of tricresyl phosphate, phenyl thiophosphate, and isobutylene sulfide;

[0015] The defoaming agent is dimethyl silicone oil or TEGO Foamex 830 defoaming agent;

[0016] Furthermore, the preparation method of the functional additive includes the following steps: uniformly dispersing the pre-treatment carrier substrate in toluene at a solid-liquid ratio of 10 to 30 g / L, adding a silane coupling agent KH-580 whose mass is 0.2 to 0.4 times that of the pre-treatment carrier substrate, mixing and stirring evenly, and then reflux stirring and reacting for 4 to 6 hours; after the reaction is completed, reducing the temperature of the product components to 50 to 65°C, and then adding a modifier whose mass is 0.6 to 1.2 times that of the pre-treatment carrier substrate, 0.5 to 0.8 times that of the antioxidant GM, and 0.08 to 0.12 times that of the dibutyltin dilaurate, respectively, mixing and stirring evenly, and then keeping warm and stirring at a temperature of 50 to 65°C for 5 to 8 hours; after the reaction is completed, filtering and vacuum drying the product components in turn, and the result is the functional additive.

[0017] Furthermore, the preparation method of the modifier is: 5-isocyanate isophthaloyl chloride is evenly dispersed in acetone with a mass 3 to 5 times that of acetone, and then 2,6-di-tert-butyl-4-hydroxymethylphenol with a molar amount 2 to 3 times that of 5-isocyanate isophthaloyl chloride is added in an ice water bath environment, and the mixture is stirred evenly and then reacted at a temperature of 20 to 30° C. for 5 to 8 hours; the modifier is obtained after the reaction is completed.

[0018] Furthermore, the preparation method of the pre-treated carrier substrate is: immerse the carrier substrate in a hydrofluoric acid solution with a mass 10 to 15 times that of the carrier substrate and a concentration of 30wt% for 20 to 25 hours, then filter out the carrier substrate and wash it with deionized water for 3 to 5 times; after washing, immerse it in a hydrogen peroxide aqueous solution with a mass and concentration equal to that of the hydrofluoric acid solution for 40 to 60 minutes, and then filter and dry naturally to obtain the pre-treated carrier substrate.

[0019] Furthermore, the method for preparing the carrier substrate comprises the following steps:

[0020] Step 1: Nano-zirconia microspheres (purchased from Beijing Beike New Materials Technology Co., Ltd., with an average particle size of 20 nm and a specific surface area of ​​30 to 50 m 2 / g) is evenly dispersed in ethanol, and then 3-aminopropyltrimethoxysilane with a mass of 0.1 to 0.2 times that of the nano zirconium oxide microspheres is added, stirred evenly and refluxed for 3 to 5 hours; after the reaction is completed, the reaction product is centrifuged, washed with water and dried in sequence; the obtained modified nano zirconium oxide microspheres are stored and used for later use;

[0021] Step 2: Add the modified nano-zirconia microspheres into DMF at a solid-liquid ratio of 50 to 80 g / L, then add carboxylated graphene 2 to 3 times the mass of the modified nano-zirconium oxide, 5 to 10 times the mass of dicyclohexylcarbocyanine, and 1.0 to 1.5 times the mass of N, N-dimethyl-4-pyridinamine, mix and stir evenly, and then keep stirring and react at a temperature of 30 to 40° C. for 30 to 50 hours; after the reaction is completed, filter the product components, wash the obtained filter cake with distilled water and ethanol for 2 to 3 times, respectively, and then dry the obtained solid powder and mix and stir it evenly with silicon powder 3 to 5 times the mass of the solid powder, and finally treat it at high temperature in an argon atmosphere to obtain a carrier substrate.

[0022] Furthermore, the high temperature treatment process is: first heat treatment at a temperature of 800-1200°C for 2-3 hours, and then heat treatment at a temperature of 1500-1800°C for 2-4 hours; wherein, the heating rate is set to 5-10°C / min when adjusting the temperature.

[0023] Furthermore, the base oil is prepared by mixing high-viscosity synthetic base oil, poly-α-olefin base oil and polyester base oil in a ratio of 8 to 10: 1: 1 to 2;

[0024] Among them, the high-viscosity synthetic base oil is Indonesian PX20 or Shell X420; the polyalphaolefin base oil is Mobil PAO4 or Mobil PAO6; the polyester base oil is Italian Ite Polyester KL115 or Italian Ite Polyester KL135.

[0025] Furthermore, the viscosity modifier is selected from any one of Afton HiTEC 5777, Afton HiTEC 3339, and Afton HiTEC 355.

[0026] Furthermore, the polyol ester is any one of TM108, TM118 and TM143.

[0027] A production process of electric vehicle axle gear oil comprises the following steps: weighing various raw materials according to the formula amount, then transferring the base oil, functional additives and defoaming agent into a blending kettle, raising the kettle temperature to 60-70°C and adding the remaining raw materials into the blending kettle while stirring at this temperature, maintaining the kettle temperature at 60-70°C, and continuing stirring at a rate of 600-800 r / min for 1-2 hours, and finally obtaining the electric vehicle axle gear oil.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention firstly performs modification treatment on nano zirconium oxide microspheres by 3-aminopropyltrimethoxysilane, so that the two are connected by chemical bonds, and the modified nano zirconium oxide microspheres are prepared. The modified nano zirconium oxide microspheres are put into DMF and carboxylated graphene, dicyclohexylcarbodiimide and N, N-dimethyl-4-pyridylamine are added respectively, and a chemical reaction occurs under the action of N, N-dimethyl-4-pyridylamine, and the obtained solid powder is mixed with silicon powder, and high-temperature treatment is performed under the protection of rare gas, and finally a layer of silicon carbide coating film is formed on the surface of the modified nano zirconium oxide. Since nano zirconium oxide itself has good wear resistance, the "ball" structure of the nano zirconium oxide microspheres makes its wear resistance better. Moreover, the existence of the silicon carbide coating film further improves the wear resistance and friction reduction performance of the carrier substrate.

[0030] The obtained carrier substrate is first soaked in a hydrofluoric acid solution and then soaked in a hydrogen peroxide aqueous solution, so that the surface of the final prepared pre-treatment carrier substrate has abundant hydroxyl groups, paving the way for subsequent chemical reactions. The pre-treatment carrier substrate is dispersed in toluene and modified by adding silane coupling agent KH-580, and then antioxidant GM is added thereto. Under the mediation of silane coupling agent KH-580, antioxidant GM is successfully "grafted" on the surface of the pre-treatment carrier substrate. Under the action of dibutyltin dilaurate, the modifier reacts with the active groups on the surface of the pre-treatment carrier substrate to form a bond, thereby "grafting" the modifier with excellent antioxidant properties on the surface of the pre-treatment carrier substrate. The prepared functional additive has an obvious core-shell structure, the "core" layer of which is the pre-treatment carrier substrate, and the "shell" layer is a three-dimensional antioxidant envelope layer formed by the criss-crossing of the modifier and antioxidant GM. The presence of the three-dimensional envelope layer makes the functional additive have excellent antioxidant properties, while the nano zirconium oxide microspheres and the silicon carbide coating layer on their surface make the functional additive have excellent wear resistance and friction reduction properties.

[0031] In summary, the functional additive prepared by the present invention is used as the raw material of electric vehicle axle gear oil, so that the produced gear oil not only has excellent high temperature resistance, wear resistance and friction reduction performance, but also has good antioxidant performance, which reduces the wear degree of the axle gear to a certain extent, prolongs the service life of the gear oil and also prolongs the service life of the axle gear, effectively ensuring the grade and quality of the gear oil. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1

[0034] An electric vehicle axle gear oil, the gear oil is composed of the following raw materials in parts by weight: 90 parts of base oil, 0.5 parts of N, N-di-n-butylaminotoluenetriazole, 9 parts of Afton HiTEC 5777 viscosity modifier, 10 parts of polyol ester TM108, 1 part of pour point depressant, 1 part of compound antioxidant, 1.5 parts of demulsifier D114, 0.8 parts of benzotriazole, 3 parts of tricresyl phosphate, 0.2 parts of dimethyl silicone oil and 5 parts of functional additives;

[0035] The pour point depressant is prepared by mixing alkyl naphthalene and polymethacrylate 1-368 in equal weight ratios; the antioxidant is prepared by mixing antioxidant BHT and 4,4'-dioctyl diphenylamine in equal weight ratios;

[0036] The base oil is a mixture of high-viscosity synthetic base oil, poly-α-olefin base oil and polyester base oil in the ratio of 8:1:1; among them, the high-viscosity synthetic base oil is Indonesian PX20; the poly-α-olefin base oil is Mobil PAO4; and the polyester base oil is Italian Itac KL115.

[0037] The preparation method of the functional additive comprises the following steps: uniformly dispersing a pre-treatment carrier substrate in toluene at a solid-liquid ratio of 10 g / L, adding a silane coupling agent KH-580 whose mass is 0.2 times of the pre-treatment carrier substrate, mixing and stirring evenly, and then reflux stirring and reacting for 4 hours; after the reaction is completed, reducing the temperature of the resultant components to 50°C, and then adding a modifier whose mass is 0.6 times of the pre-treatment carrier substrate, 0.5 times of the antioxidant GM, and 0.08 times of the dibutyltin dilaurate, respectively, and mixing and stirring evenly, and then keeping warm and stirring and reacting at a temperature of 50°C for 5 hours; after the reaction is completed, filtering and vacuum drying the resultant components in turn, and the obtained functional additive is obtained.

[0038] The preparation method of the modifier is as follows: 5-isocyanate isophthaloyl chloride is uniformly dispersed in acetone with a mass three times that of the acetone, and then 2,6-di-tert-butyl-4-hydroxymethylphenol with a molar amount twice that of 5-isocyanate isophthaloyl chloride is added in an ice water bath environment, and the mixture is stirred evenly and then reacted at a temperature of 20° C. for 5 hours; the modifier is obtained after the reaction is completed.

[0039] The preparation method of the pre-treated carrier substrate is as follows: immerse the carrier substrate in a hydrofluoric acid solution with a mass 10 times that of the carrier substrate and a concentration of 30wt% for 20 hours, then filter out the carrier substrate and wash it with deionized water for 3 times; after washing, immerse it in a hydrogen peroxide aqueous solution with a mass and concentration equal to that of the hydrofluoric acid solution for 40 minutes, and then filter and dry naturally to obtain the pre-treated carrier substrate.

[0040] The method for preparing the carrier substrate comprises the following steps:

[0041] Step 1, uniformly dispersing the nano zirconium oxide microspheres in ethanol at a solid-liquid ratio of 20 g / L, then adding 3-aminopropyltrimethoxysilane in an amount 0.1 times the mass of the nano zirconium oxide microspheres, stirring evenly and then reflux reacting for 3 hours; after the reaction is completed, centrifuging, washing and drying the reaction products in sequence; the obtained modified nano zirconium oxide microspheres are stored and reserved;

[0042] Step 2: Add the modified nano-zirconia microspheres into DMF at a solid-liquid ratio of 50 g / L, then add carboxylated graphene twice as much as the modified nano-zirconium oxide, 5 times as much as dicyclohexylcarbocyanine, and 1.0 times as much as N, N-dimethyl-4-pyridinamine, mix and stir evenly, and then keep stirring and react at 30°C for 30 hours; after the reaction is completed, filter the product components, wash the filter cake twice with distilled water and ethanol respectively, and then dry the solid powder and mix and stir the silicon powder three times as much as the weight thereof, and finally perform high-temperature treatment in an argon atmosphere to obtain a carrier substrate; wherein, the high-temperature treatment process is: first heat treatment at 800°C for 3 hours, and then heat treatment at 1500°C for 4 hours; wherein, the heating rate is set to 5°C / min when adjusting the temperature.

[0043] A production process of electric vehicle axle gear oil comprises the following steps: weighing various raw materials according to the formula amount, then transferring the base oil, functional additives and defoaming agent into a blending kettle, raising the kettle temperature to 60°C and adding the remaining raw materials into the blending kettle while stirring at this temperature, maintaining the kettle temperature at 60°C, and continuing to stir at a rate of 600r / min for 1h, and finally obtaining the electric vehicle axle gear oil.

[0044] Example 2

[0045] The production process of an electric vehicle axle gear oil provided in this embodiment is basically the same as that in Example 1, except that the specific composition of the raw materials used and the preparation method of the functional additives are not exactly the same, and the specific composition of the raw materials used in this embodiment and the preparation method of the functional additives are as follows:

[0046] An electric vehicle axle gear oil, the gear oil is composed of the following raw materials in parts by weight: 100 parts of base oil, 1.0 parts of N, N-di-n-butylaminotoluene triazole, 10 parts of Afton HiTEC3339 viscosity modifier, 12 parts of polyol ester TM 118, 2 parts of pour point depressant, 1.5 parts of compound antioxidant, 2.0 parts of demulsifier T1001, 1.2 parts of barium dinonylnaphthalene sulfonate, 5 parts of phenyl thiophosphate, 0.4 parts of TEGO Foamex 830 defoamer and 6 parts of functional additives;

[0047] The preparation method of the functional additive comprises the following steps: uniformly dispersing a pre-treated carrier substrate in toluene at a solid-liquid ratio of 20 g / L, adding a silane coupling agent KH-580 whose mass is 0.3 times of the pre-treated carrier substrate, mixing and stirring evenly, and then reflux stirring and reacting for 5 hours; after the reaction is completed, reducing the temperature of the resultant components to 60°C, and then adding a modifier whose mass is 0.8 times of the pre-treated carrier substrate, 0.6 times of the antioxidant GM, and 0.1 times of the dibutyltin dilaurate, respectively, mixing and stirring evenly, and then keeping warm and stirring and reacting at a temperature of 60°C for 6 hours; after the reaction is completed, filtering and vacuum drying the resultant components in turn, and the obtained functional additive is obtained.

[0048] The preparation method of the modifier is as follows: 5-isocyanate isophthaloyl chloride is uniformly dispersed in acetone with a mass four times that of the acetone, and then 2,6-di-tert-butyl-4-hydroxymethylphenol with a molar amount three times that of 5-isocyanate isophthaloyl chloride is added in an ice water bath environment, and the mixture is stirred evenly and then reacted at a temperature of 25° C. for 6 hours; the modifier is obtained after the reaction is completed.

[0049] The preparation method of the pre-treated carrier substrate is as follows: immerse the carrier substrate in a hydrofluoric acid solution with a mass 10 times that of the carrier substrate and a concentration of 30wt% for 20 hours, then filter out the carrier substrate and wash it with deionized water 4 times; after washing, immerse it in a hydrogen peroxide aqueous solution with a mass and concentration equal to that of the hydrofluoric acid solution for 50 minutes, then filter and dry naturally to obtain the pre-treated carrier substrate.

[0050] The method for preparing the carrier substrate comprises the following steps:

[0051] Step 1, uniformly dispersing the nano zirconium oxide microspheres in ethanol at a solid-liquid ratio of 30 g / L, then adding 3-aminopropyltrimethoxysilane in an amount of 0.15 times the mass of the nano zirconium oxide microspheres, stirring evenly and then reflux reacting for 4 hours; after the reaction is completed, centrifuging, washing and drying the reaction products in sequence; the obtained modified nano zirconium oxide microspheres are stored and reserved;

[0052] Step 2: Add the modified nano-zirconia microspheres into DMF at a solid-liquid ratio of 60 g / L, then add carboxylated graphene 3 times the mass of the modified nano-zirconium oxide, 8 times the mass of dicyclohexylcarbocyanine, and 1.2 times the mass of N, N-dimethyl-4-pyridinamine, mix and stir evenly, and then keep stirring and react at 35°C for 40 hours; after the reaction is completed, filter the product components, wash the filter cake with distilled water and ethanol for 3 times, and then dry the solid powder and mix and stir the silicon powder 4 times the mass, and finally perform high-temperature treatment in an argon atmosphere to obtain a carrier substrate; wherein, the high-temperature treatment process is: first heat treatment at a temperature of 1000°C for 3 hours, and then heat treatment at a temperature of 1600°C for 3 hours; wherein, the heating rate is set to 10°C / min when adjusting the temperature.

[0053] Example 3

[0054] The production method of a high temperature resistant gear oil with gloss retention performance provided in this embodiment is basically the same as that in Example 1, except that the specific composition of the raw materials used and the preparation method of the functional additives are not exactly the same, and the specific composition of the raw materials used in this embodiment and the preparation method of the functional additives are as follows:

[0055] An electric vehicle axle gear oil, the gear oil is composed of the following raw materials in parts by weight: 110 parts of base oil, 1.2 parts of N, N-di-n-butylaminotoluene triazole, 12 parts of Afton HiTEC 355 viscosity modifier, 15 parts of polyol ester TM 143, 3 parts of pour point depressant, 2 parts of compound antioxidant, 2.5 parts of demulsifier D114, 1.5 parts of benzotriazole, 6 parts of sulfided isobutylene, 0.6 parts of dimethyl silicone oil and 8 parts of functional additives;

[0056] The preparation method of the functional additive comprises the following steps: uniformly dispersing a pre-treated carrier substrate in toluene at a solid-liquid ratio of 30 g / L, adding a silane coupling agent KH-580 whose mass is 0.4 times of the pre-treated carrier substrate, mixing and stirring evenly, and then reflux stirring and reacting for 6 hours; after the reaction is completed, reducing the temperature of the resultant components to 65°C, and then adding a modifier whose mass is 1.2 times of the pre-treated carrier substrate, an antioxidant GM whose mass is 0.8 times, and dibutyltin dilaurate whose mass is 0.12 times, respectively, and mixing and stirring evenly, and then keeping warm and stirring and reacting at a temperature of 65°C for 8 hours; after the reaction is completed, filtering and vacuum drying the resultant components in turn, and the obtained functional additive is obtained.

[0057] The preparation method of the modifier is as follows: 5-isocyanate isophthaloyl chloride is uniformly dispersed in acetone with a mass 5 times that of the acetone, and then 2,6-di-tert-butyl-4-hydroxymethylphenol with a molar amount 3 times that of 5-isocyanate isophthaloyl chloride is added in an ice water bath environment, and the mixture is stirred evenly and then reacted at a temperature of 30° C. for 8 hours; the modifier is obtained after the reaction is completed.

[0058] The preparation method of the pre-treated carrier substrate is as follows: immerse the carrier substrate in a hydrofluoric acid solution with a mass 15 times that of the carrier substrate and a concentration of 30wt% for 25 hours, then filter out the carrier substrate and wash it with deionized water 5 times; after washing, immerse it in a hydrogen peroxide aqueous solution with a mass and concentration equal to that of the hydrofluoric acid solution for 60 minutes, and then filter and dry naturally to obtain the pre-treated carrier substrate.

[0059] The method for preparing the carrier substrate comprises the following steps:

[0060] Step 1, uniformly dispersing the nano zirconium oxide microspheres in ethanol at a solid-liquid ratio of 50 g / L, then adding 3-aminopropyltrimethoxysilane in an amount 0.2 times the mass of the nano zirconium oxide microspheres, stirring evenly and then reflux reacting for 5 hours; after the reaction is completed, centrifuging, washing and drying the reaction products in sequence; the obtained modified nano zirconium oxide microspheres are stored and reserved;

[0061] Step 2: Add the modified nano-zirconia microspheres into DMF at a solid-liquid ratio of 80 g / L, then add carboxylated graphene 3 times the mass of the modified nano-zirconium oxide, 10 times the mass of dicyclohexylcarbocyanine, and 1.5 times the mass of N, N-dimethyl-4-pyridinamine, mix and stir evenly, and then keep stirring and react at a temperature of 40°C for 50 hours; after the reaction is completed, filter the product components, wash the filter cake with distilled water and ethanol for 3 times, and then dry the solid powder and mix and stir the silicon powder 5 times the mass, and finally perform high-temperature treatment in an argon atmosphere to obtain a carrier substrate; wherein, the high-temperature treatment process is: first heat treatment at a temperature of 1200°C for 2 hours, and then heat treatment at a temperature of 1800°C for 2 hours; wherein, the heating rate is set to 10°C / min when adjusting the temperature.

[0062] Comparative Example 1: The main difference between this example and Example 1 is that in this example, an equal amount of a modifier is used to replace the antioxidant GM during the preparation of the functional additive;

[0063] Comparative Example 2: The main difference between this example and Example 1 is that in this example, an equal amount of antioxidant GM is used to replace the modifier in the process of preparing the functional additive;

[0064] Comparative Example 3: The main difference between this example and Example 1 is that an equal amount of carrier substrate is used to replace the functional additive in this example.

[0065] Comparative Example 4: The main difference between this example and Example 1 is that an equal amount of nano-zirconia microspheres are used to replace the functional additives in this example.

[0066] Performance Testing

[0067] The typical physical and chemical indicators of the gear oil samples produced in Examples 1 to 3 and Comparative Examples 1 to 4 were tested respectively, and the obtained test data were recorded in the following table:

[0068] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Test methods Copper corrosion (100℃, 3h) / level 1a 1a 1a 1a 1a 1b 1b GB / T5096 Rotating oxygen bomb (150℃) / min 458 467 461 441 438 374 326 SH / T 0193 Oxidation performance (121℃, 312h) 100℃ kinematic viscosity increase / % precipitation value / mL 1.030.00 0.9800.00 1.050.00 1.160.01 1.190.01 1.270.02 1.320.02 SH / T0123 Friction coefficient (MTM) Friction coefficient (40℃) 0.027 0.026 0.026 0.028 0.027 0.027 0.032 MTM Micro-traction Tester <![CDATA[Four-ball machine test sintering load (P D ) / N Wear scar diameter (196 N, 60 min, 54 °C, 1800 r / min) / mm]]> 45890.26 46720.25 46830.25 45560.27 45490.26 46020.25 42780.30 GB / T3142SH / T0189

[0069] By comparing and analyzing the relevant data in the table, it can be seen that the gear oil produced by the present invention not only has excellent high temperature resistance, wear resistance and friction reduction performance, but also has good antioxidant performance, which reduces the wear degree of the axle gear to a certain extent, prolongs the service life of the gear oil and the axle gear, and effectively guarantees the grade and quality of the gear oil. This shows that the electric vehicle axle gear oil and its production process provided by the present invention have a broader market prospect and are more suitable for promotion.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0071] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An electric vehicle axle gear oil, characterized in that: The gear oil is composed of the following raw materials in parts by weight: 90-110 parts of base oil, 0.5-1.2 parts of N,N-di-n-butylaminotoluene triazole, 9-12 parts of viscosity modifier, 10-15 parts of polyol ester, 1-3 parts of pour point depressant, 1-2 parts of compound antioxidant, 1.5-2.5 parts of anti-emulsifier, 0.8-1.5 parts of rust inhibitor, 3-6 parts of extreme pressure anti-wear agent, 0.2-0.6 parts of defoamer and 5-8 parts of functional additives; The pour point depressant is compounded by alkyl naphthalene and acrylic polymer in a mass ratio of 1:1 to 2; the compound antioxidant is compounded by phenolic antioxidant and amine antioxidant in a mass ratio of 1:1 to 1.

5.

2. The electric vehicle axle gear oil according to claim 1, characterized in that: The preparation method of the functional additive comprises the following steps: uniformly dispersing a pre-treated carrier substrate in toluene at a solid-liquid ratio of 10 to 30 g / L, adding a silane coupling agent KH-580 whose mass is 0.2 to 0.4 times of the pre-treated carrier substrate, mixing and stirring evenly, and then reflux stirring and reacting for 4 to 6 hours; after the reaction is completed, reducing the temperature of the resultant components to 50 to 65° C., and then adding a modifier whose mass is 0.6 to 1.2 times of the pre-treated carrier substrate, an antioxidant GM whose mass is 0.5 to 0.8 times, and dibutyltin dilaurate whose mass is 0.08 to 0.12 times, respectively, and mixing and stirring evenly, and then keeping warm and stirring and reacting at a temperature of 50 to 65° C. for 5 to 8 hours; after the reaction is completed, filtering and vacuum drying the resultant components in turn, and the obtained functional additive is obtained.

3. The electric vehicle axle gear oil according to claim 2, characterized in that: The preparation method of the modifier is as follows: 5-isocyanate isophthaloyl chloride is uniformly dispersed in acetone with a mass of 3 to 5 times that of acetone, and then 2,6-di-tert-butyl-4-hydroxymethylphenol with a molar amount of 2 to 3 times that of 5-isocyanate isophthaloyl chloride is added in an ice water bath environment, and the mixture is stirred evenly and then reacted at a temperature of 20 to 30° C. for 5 to 8 hours; the modifier is obtained after the reaction is completed.

4. The electric vehicle axle gear oil according to claim 2, characterized in that: The preparation method of the pre-treated carrier substrate is as follows: immersing the carrier substrate in a hydrofluoric acid solution with a mass of 10 to 15 times and a concentration of 30 wt% for 20 to 25 hours, then filtering out the carrier substrate and washing it with deionized water for 3 to 5 times; after washing, immersing it in a hydrogen peroxide aqueous solution with a mass and concentration equal to that of the hydrofluoric acid solution for 40 to 60 minutes, and then filtering and naturally drying to obtain the pre-treated carrier substrate.

5. The electric vehicle axle gear oil according to claim 4, characterized in that: The method for preparing the carrier substrate comprises the following steps: Step 1, uniformly dispersing nano zirconium oxide microspheres in ethanol at a solid-liquid ratio of 20 to 50 g / L, then adding 3-aminopropyltrimethoxysilane in an amount of 0.1 to 0.2 times the mass of the nano zirconium oxide microspheres, stirring evenly and then reflux reacting for 3 to 5 hours; after the reaction is completed, centrifuging, washing and drying the reaction products in sequence; the obtained modified nano zirconium oxide microspheres are stored and reserved; Step 2: Add the modified nano-zirconia microspheres into DMF at a solid-liquid ratio of 50 to 80 g / L, then add carboxylated graphene 2 to 3 times the mass of the modified nano-zirconium oxide, 5 to 10 times the mass of dicyclohexylcarbocyanine, and 1.0 to 1.5 times the mass of N, N-dimethyl-4-pyridinamine, mix and stir evenly, and then keep stirring and react at a temperature of 30 to 40° C. for 30 to 50 hours; after the reaction is completed, filter the product components, wash the obtained filter cake with distilled water and ethanol for 2 to 3 times, respectively, and then dry the obtained solid powder and mix and stir it evenly with silicon powder 3 to 5 times the mass of the solid powder, and finally treat it at high temperature in an argon atmosphere to obtain a carrier substrate.

6. The electric vehicle axle gear oil according to claim 5, characterized in that: The high temperature treatment process is: first heat treatment at a temperature of 800-1200°C for 2-3 hours, and then heat treatment at a temperature of 1500-1800°C for 2-4 hours; wherein, when adjusting the temperature, the heating rate is set to 5-10°C / min.

7. The electric vehicle axle gear oil according to claim 1, characterized in that: The base oil is prepared by mixing high-viscosity synthetic base oil, poly-α-olefin base oil and polyester base oil in a ratio of 8 to 10:1:1 to 2; Among them, the high-viscosity synthetic base oil is Indonesian PX20 or Shell X420; the polyalphaolefin base oil is Mobil PAO4 or Mobil PAO6; the polyester base oil is Italian Ite Polyester KL115 or Italian Ite Polyester KL135.

8. The electric vehicle axle gear oil according to claim 1, characterized in that: The viscosity modifier is selected from any one of Afton HiTEC 5777, Afton HiTEC 3339 and Afton HiTEC 355.

9. The electric vehicle axle gear oil according to claim 1, characterized in that: The polyol ester is any one of TM108, TM118 and TM143.

10. The production process of an electric vehicle axle gear oil according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: weighing various raw materials according to the formula amount, and then transferring the base oil, functional additives and defoaming agent into a blending kettle, raising the kettle temperature to 60-70°C and adding the remaining raw materials into the blending kettle while stirring at this temperature, maintaining the kettle temperature at 60-70°C, and continuing to stir at a rate of 600-800r / min for 1-2h, and finally obtaining electric vehicle axle gear oil.