A gear oil, its preparation and use

Abstract

The application provides a gear oil and a preparation method and application thereof, and belongs to the technical field of gear oils. The gear oil provided by the application comprises the following components in parts by mass: base oil 70-84 parts, viscosity index improver 10-20 parts, magnetic additive 0.3-1 part, power enhancer 1-2 parts, composite synergist 3-6 parts, alkaline improver 0.5-2 parts and antifoaming agent 0.1-0.5 part. The composition of the gear oil and the amount of each component are controlled, so that the gear oil has excellent extreme pressure, anti-wear, corrosion resistance and antifoaming properties, and is suitable for oil-electric hybrid passenger vehicles. The results of the examples show that the gear oil provided by the application has a p B Above 912.6N, p D 6080.1N, ZMZ above 542.6N, and the wear scar diameter is below 0.65mm.

Description

Technical Field

[0001] This invention belongs to the field of gear oil technology, specifically relating to a gear oil, its preparation method, and its application. Background Technology

[0002] During the operation of automotive gears, relative motion occurs between the tooth surfaces. Gear oil can form a stable oil film between the tooth surfaces, reducing friction between the gears and tooth surfaces, while also providing cooling, corrosion and rust prevention, and shock absorption.

[0003] Traditional automobiles are primarily gasoline-powered vehicles, but with increasingly stringent environmental regulations worldwide, new energy vehicles are gradually becoming more widespread. Because gasoline and new energy vehicle engines differ, their gear oil requirements also differ. Due to the relatively short history of new energy vehicle adoption, there are currently very few gear oils on the market specifically designed for them, let alone those suitable for both gasoline and new energy vehicles. Furthermore, the performance of existing gear oils needs further improvement. Summary of the Invention

[0004] The purpose of this invention is to provide a gear oil, its preparation method, and its application. The gear oil provided by this invention is suitable for both internal combustion engines and electric motors, and possesses excellent extreme pressure, anti-wear, and corrosion resistance properties.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] This invention provides a gear oil, comprising the following components by mass: 70-84 parts base oil, 10-20 parts viscosity index improver, 0.3-1 parts magnetic additive, 1-2 parts power enhancer, 3-6 parts composite synergist, 0.5-2 parts alkalinity improver, and 0.1-0.5 parts antifoaming agent.

[0007] Preferably, the kinematic viscosity of the base oil is 60-80 mm. 2 / s, density is 0.8~0.95g / cm³ 3 Viscosity index 90–130, flash point ≥200℃, oxidation induction time at 121℃ ≥15 min, p B ≥200N, p D ≥300N, wear scar diameter ≤0.6mm.

[0008] Preferably, the viscosity index improver includes at least one of polyisobutylene, polymethacrylate, and ethylene propylene copolymer.

[0009] Preferably, the magnetic additive includes at least one of magnetic nano-ferric oxide, magnetic nano-ferric oxide, nano-MnZnFe2O4, organosilicon-modified magnetic nanospheres, and carbon nanotube-ferric oxide composite materials.

[0010] Preferably, the power enhancer comprises at least one of isooctyl nitrate, castor oil diethanolamide borate, dimethyl carbonate, methyl tert-butyl ether, cyclopentadiene lead, and methylcyclopentadiene manganese tricarbonyl.

[0011] Preferably, the composite synergist includes at least one of extreme pressure anti-wear agent, antioxidant and corrosion inhibitor.

[0012] Preferably, the alkalinity improving agent includes at least one of ashless alkalinity improving agent and ash-containing alkalinity improving agent;

[0013] The structural formula of the ashless alkaline improver is as follows: R1 and R2 are independently C1-12 alkyl groups, R3 is a C1-8 alkyl group or a substituted alkyl group, and X is -OC3H5;

[0014] The alkalinity enhancer includes at least one of synthetic sulfonate, alkylphenol calcium, and salicylate.

[0015] Preferably, the antifoaming agent comprises at least one of dimethyl silicone oil, polydimethylsiloxane, polyether-modified silicone oil, cyanuric chloride melamine, fluorinated alkyl phosphate, fatty acid glycerides, and copolymers of ethylene oxide and propylene oxide.

[0016] The present invention also provides a method for preparing the gear oil described in the above technical solution, comprising the following steps:

[0017] (1) Mix base oil, viscosity index improver, magnetic additive, power enhancer, composite synergist and alkaline improver to obtain a mixture;

[0018] (2) Add the antifoaming agent to the mixture obtained in step (1) in the form of spray to obtain gear oil.

[0019] The present invention also provides the application of the gear oil described in the above technical solution or the gear oil prepared by the preparation method described in the above technical solution in the automotive field.

[0020] This invention provides a gear oil, comprising, by weight, the following components: 70-84 parts base oil, 10-20 parts viscosity index improver, 0.3-1 part magnetic additive, 1-2 parts power enhancer, 3-6 parts composite synergist, 0.5-2 parts alkalinity improver, and 0.1-0.5 parts antifoaming agent. This invention controls the composition and dosage of each component in the gear oil, resulting in excellent extreme pressure, anti-wear, anti-corrosion, and antifoaming properties, making it suitable for hybrid passenger vehicles. Results from the embodiments show that the gear oil provided by this invention has a p... B Above 912.6N, p DThe wear resistance is 6080.1N, ZMZ is above 542.6N, and the wear scar diameter is below 0.65mm. Attached Figure Description

[0021] Figure 1 The SRV variable load friction and wear diagram is shown for the gear oil in Example 2.

[0022] Figure 2 Example 2 shows the frictional temperature rise experiment and friction coefficient diagram of gear oil;

[0023] Figure 3 The frictional temperature rise experiment and friction coefficient diagram are for Comparative Example 3 gear oil. Detailed Implementation

[0024] This invention provides a gear oil, comprising the following components by mass: 70-84 parts base oil, 10-20 parts viscosity index improver, 0.3-1 parts magnetic additive, 1-2 parts power enhancer, 3-6 parts composite synergist, 0.5-2 parts alkalinity improver, and 0.1-0.5 parts antifoaming agent.

[0025] Unless otherwise specified, the present invention does not have any special limitations on the source of each component, and commercially available products well known to those skilled in the art can be used.

[0026] The gear oil provided by this invention comprises 70 to 84 parts of base oil by weight. In embodiments of this invention, the amount of base oil may be specifically 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, or 84 parts.

[0027] In this invention, the kinematic viscosity (40°C) of the base oil is preferably 60–80 mm. 2 / s, density (20℃) preferably 0.8~0.95g / cm³ 3 The viscosity index is preferably 90–130, the flash point is preferably ≥200℃, the oxidation induction time at 121℃ is preferably ≥15 min, and p B Preferred ≥200N, p D Preferably, the N value is ≥300N, and the wear scar diameter (392N, 75℃, 1200r) is preferably ≤0.6mm. This invention controls the various indicators of the base oil within the above ranges, thereby further improving the performance of the gear oil.

[0028] In this invention, the base oil is preferably obtained by mixing multiple base oils. This invention does not specifically limit the types of base oils, as long as the indicators after mixing meet the above requirements. In this invention, the base oil is preferably obtained by mixing one of Daqing hydrotreated base oil HVIW H350, Karamay hydrotreated base oil KH150BS, and Lanzhou Petrochemical deep-refined mineral oil MVIS150BS with 500SN and PAO10. In this invention, the preferred mass ratio of one of Daqing hydrotreated base oil HVIW H350, Karamay hydrotreated base oil KH150BS, and Lanzhou Petrochemical deep-refined mineral oil MVIS150BS, 500SN, and PAO10 is (31-34):(20-25):25.

[0029] Based on a base oil content of 70-84 parts, the gear oil provided by this invention also includes 10-20 parts of a viscosity index improver. In embodiments of this invention, the amount of the viscosity index improver may specifically be 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 parts.

[0030] In this invention, the viscosity index improver preferably includes at least one of polyisobutylene, polymethacrylate, and ethylene-propylene copolymer. In this invention, the number average molecular weight of the viscosity index improver is preferably between 2000 and 10000. By controlling the amount and type of viscosity index improver within the above range, this invention can further improve the various properties of gear oil.

[0031] Based on a base oil content of 70-84 parts, the gear oil provided by this invention further includes 0.3-1 parts of magnetic additive. In embodiments of this invention, the amount of magnetic additive may specifically be 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, or 1 part.

[0032] In this invention, the magnetic additive preferably includes at least one of magnetic nano-ferric oxide, magnetic nano-ferric oxide, nano-MnZnFe2O4, organosilicon-modified magnetic nanospheres, and carbon nanotube-ferric oxide composite materials. In this invention, the diameter of the carbon nanotubes in the carbon nanotube-ferric oxide composite material is preferably 8–15 nm, and the length is preferably 10–30 mm; the mass ratio of carbon nanotubes to ferric oxide in the carbon nanotube-ferric oxide composite material is preferably (2–4):1, more preferably 3:1.

[0033] In this invention, the particle size of the magnetic additive is preferably 0.01 to 0.05 μm.

[0034] This invention controls the amount and type of magnetic additives within the above-mentioned range, which can further improve the various properties of gear oil.

[0035] Based on a base oil content of 70-84 parts, the gear oil provided by the present invention also includes 1-2 parts of a power enhancer.

[0036] In this invention, the power enhancer preferably includes at least one selected from isooctyl nitrate, castor oil diethanolamide borate, dimethyl carbonate, methyl tert-butyl ether, cyclopentadiene lead, and methylcyclopentadiene manganese tricarbonyl. This invention controls the dosage, type, and other parameters of the power enhancer within the aforementioned range, thereby further improving the various properties of the gear oil.

[0037] Based on a base oil content of 70-84 parts, the gear oil provided by this invention further includes 3-6 parts of a compound synergist. In embodiments of this invention, the amount of the compound synergist may specifically be 3 parts, 4 parts, 5 parts, or 6 parts.

[0038] In this invention, the composite synergist preferably includes at least one of extreme pressure anti-wear agent, antioxidant and corrosion inhibitor, and more preferably includes extreme pressure anti-wear agent, antioxidant and corrosion inhibitor.

[0039] In this invention, when the composite synergist includes an extreme pressure anti-wear agent, an antioxidant, and a corrosion inhibitor, the mass ratio of the extreme pressure anti-wear agent, the antioxidant, and the corrosion inhibitor is preferably (1-3):(0.1-1):(0.1-1), more preferably 2:0.5:0.5.

[0040] In this invention, the extreme pressure anti-wear agent preferably includes at least one of dibenzyl disulfide, N,N-di(polyethylene glycol)octadecylamine, stearamide, antimony dialkyl dithiophosphate, antimony dialkyl dithiocarbamate, molybdenum dialkyl dithiophosphate, lead naphthenate, and lanthanum nanoborate.

[0041] In this invention, the antioxidant preferably includes at least one of butylated hydroxytoluene, alkylated diphenylamine, p-tert-octylphenol, alkenyl succinate, thiobis(p-tert-octylphenol)benzene, diisooctyl diphenylamine, and carbamate.

[0042] In this invention, the corrosion inhibitor preferably includes at least one of alkenyl succinic acid, barium dinonylnaphthalenesulfonate, zinc thiophosphate butyrate, organic nitrogen-molybdenum fullerene, benzotriazole derivatives, and metal nanomaterials for self-healing. This invention controls the dosage, type, and other parameters of the composite synergist within the aforementioned range, thereby further improving the various properties of the gear oil.

[0043] Based on a base oil content of 70-84 parts, the gear oil provided by this invention further includes 0.5-2 parts of an alkalinity enhancer. In embodiments of this invention, the amount of the alkalinity enhancer may specifically be 0.5 parts, 1 part, 1.5 parts, or 2 parts.

[0044] In this invention, the alkalinity enhancer preferably includes at least one of ashless alkalinity enhancer and ash alkalinity enhancer, more preferably an ash alkalinity enhancer.

[0045] In this invention, the preferred structural formula of the ashless alkalinity enhancer is...

[0046]

[0047] In this invention, R1 and R2 are independently preferred to be C1-12 alkyl groups; R3 is preferably a C1-8 alkyl group or a substituted alkyl group; and X is preferably -OC3H5.

[0048] In this invention, the ash-base improving agent preferably includes at least one selected from synthetic sulfonate, alkylphenol calcium, and salicylate. This invention does not have a specific limitation on the source of the ash-base improving agent; commercially available products well-known to those skilled in the art can be used. In the embodiments of this invention, the synthetic sulfonate is synthetic sulfonate T106 produced by Henan Xinxiang Ruifeng New Materials Co., Ltd.; the alkylphenol calcium is alkylphenol calcium T115B produced by Henan Xinxiang Ruifeng New Materials Co., Ltd.; and the salicylate is salicylate T109 produced by Henan Xinxiang Ruifeng New Materials Co., Ltd.

[0049] This invention controls the dosage, type, and other parameters of the alkalinity enhancer within the above-mentioned range, which can further improve the various properties of gear oil.

[0050] Based on a base oil content of 70-84 parts, the gear oil provided by this invention further includes 0.1-0.5 parts of an antifoaming agent. In embodiments of this invention, the amount of the antifoaming agent may specifically be 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, or 0.5 parts.

[0051] In this invention, the antifoaming agent preferably includes at least one selected from dimethyl silicone oil, polydimethylsiloxane, polyether-modified silicone oil, cyanuric chloride melamine, fluorinated alkyl phosphate ester, fatty acid glycerides, and copolymers of ethylene oxide and propylene oxide. This invention controls the dosage, type, and other parameters of the antifoaming agent within the aforementioned range, thereby further improving the various properties of the gear oil.

[0052] This invention addresses the lubrication methods of gears in hybrid passenger vehicles. It selects a suitable blended base oil and adds high-performance viscosity index improvers, magnetic additives, power enhancers, composite synergists, alkalinity improvers, and antifoaming agents. This results in a gear oil with noise reduction, energy saving, and powerful performance characteristics, suitable for both internal combustion engines and electric motors. While ensuring lubrication, it also saves energy and reduces emissions, reducing mechanical noise and improving fuel economy in vehicles with internal combustion engines. Simultaneously, it enhances the traction and transmission efficiency of electric motors, resulting in minimal temperature rise during friction lubrication and significant energy savings.

[0053] The present invention also provides a method for preparing the gear oil described in the above technical solution, comprising the following steps:

[0054] (1) Mix base oil, viscosity index improver, magnetic additive, power enhancer, composite synergist and alkaline improver to obtain a mixture;

[0055] (2) Add the antifoaming agent to the mixture obtained in step (1) in the form of spray to obtain gear oil.

[0056] This invention mixes base oil, viscosity index improver, magnetic additive, power enhancer, composite synergist and alkalinity improver to obtain a mixture.

[0057] In this invention, the preferred method for mixing the base oil, viscosity index improver, magnetic additive, power enhancer, composite synergist, and alkalinity improver is to add the viscosity index improver, composite synergist, magnetic additive, power enhancer, and alkalinity improver to the base oil in sequence.

[0058] After obtaining the mixture, the present invention adds an antifoaming agent to the mixture in the form of a spray to obtain gear oil.

[0059] In this invention, the flow rate during spraying is preferably 0.5 to 1.5 mL / min, more preferably 1 mL / min.

[0060] Antifoaming agents have poor compatibility with base oils and other components. The present invention adds them in the form of spray, which can better and more evenly add the antifoaming agent to the gear oil, resulting in a better antifoaming effect.

[0061] The present invention also provides the application of the gear oil described in the above technical solution or the gear oil prepared by the preparation method described in the above technical solution in the automotive field.

[0062] The present invention does not impose any special limitations on the operation of the application, and any technical solution known to those skilled in the art can be used.

[0063] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0064] Example 1

[0065] A gear oil, by weight, comprises the following components: 79 parts base oil (34 parts Daqing hydrotreated base oil HVIW). The ingredients are: H350, 20 parts 500SN and 25 parts PAO10 (Daqing hydrotreated base oil HVIWH350, 500SN and PAO10 in a mass ratio of 34:20:25), viscosity index improver (polyisobutylene, molecular weight 2500) 15 parts, magnetic additive (magnetic nano ferric oxide, 0.01~0.05μm) 0.5 parts, power enhancer (isooctyl nitrate) 1.5 parts, composite synergist 3 parts (2 parts dibenzyl disulfide, 0.5 parts dibutylhydroxytoluene, 0.5 parts dinonylnaphthalene sulfonate, in a mass ratio of 2:0.5:0.5), alkalinity improver (synthetic sulfonate T106) 0.8 parts, and antifoaming agent (polydimethylsiloxane) 0.2 parts.

[0066] The gear oil is prepared by: (1) adding viscosity index improver, composite synergist, magnetic additive, power enhancer and alkalinity improver to base oil in sequence to obtain a mixture;

[0067] (2) The antifoaming agent is added to the mixture in the form of a spray to obtain gear oil; the flow rate of the spray is 1 mL / min.

[0068] Example 2

[0069] A gear oil, by mass parts, comprises the following components: 79 parts base oil (31 parts Karamay hydrotreated base oil KH150BS, 23 parts 500SN, and 25 parts PAO10, with a mass ratio of Karamay hydrotreated base oil KH150BS, 500SN, and PAO10 of 31:23:25), 15 parts viscosity index improver (polyisobutylene, molecular weight 2500), and magnetic additive (magnetic nano-ferric oxide, 0.01~ 0.5 parts of 0.05μm, 1.5 parts of power enhancer (isooctyl nitrate), 3 parts of composite synergist (2 parts of antimony dialkyl dithiocarbamate, 0.5 parts of butylated hydroxytoluene, 0.5 parts of barium dinonylnaphthalene sulfonate, with a mass ratio of antimony dialkyl dithiocarbamate, butylated hydroxytoluene and barium dinonylnaphthalene sulfonate of 2:0.5:0.5), 0.7 parts of alkalinity improver (calcium alkylphenol T115B) and 0.3 parts of antifoaming agent (polydimethylsiloxane);

[0070] The gear oil is prepared using the same method as in Example 1.

[0071] Example 3

[0072] A gear oil, by weight, comprises the following components: 79 parts base oil (34 parts Lanzhou Petrochemical deep-refined mineral oil MVIS150BS, 20 parts 500SN, and 25 parts PAO10, with a mass ratio of 34:20:25), 15 parts viscosity index improver (polyisobutylene, molecular weight 2500), and magnetic additive (magnetic nano-oxygen trioxide). The composition includes: 0.5 parts of ferric oxide (0.01-0.05 μm), 1.5 parts of power enhancer (isooctyl nitrate), 3 parts of composite synergist (2 parts dibenzyl disulfide, 0.5 parts dibutylhydroxytoluene, 0.5 parts barium dinonylnaphthalene sulfonate, with a mass ratio of dibenzyl disulfide, dibutylhydroxytoluene and barium dinonylnaphthalene sulfonate of 2:0.5:0.5), 0.8 parts of alkalinity improver (synthetic sulfonate T106), and 0.2 parts of antifoaming agent (polydimethylsiloxane);

[0073] The gear oil is prepared using the same method as in Example 1.

[0074] Example 4

[0075] A gear oil, by weight, comprises the following components: 79 parts base oil (31 parts Karamay hydrotreated base oil KH150BS, 23 parts 500SN, and 25 parts PAO10, with a mass ratio of Karamay hydrotreated base oil KH150BS, 500SN, and PAO10 of 31:23:25), 15 parts viscosity index improver (polymethyl methacrylate, molecular weight 3000), and magnetic additive (nano MnZnFe2O4, 0.01-0.01%). 0.5 parts of 0.05μm, 1.5 parts of power enhancer (castor oil diethanolamide borate), 3 parts of composite synergist (2 parts of antimony dialkyl dithiocarbamate, 0.5 parts of butylated hydroxytoluene, 0.5 parts of barium dinonylnaphthalene sulfonate, with a mass ratio of antimony dialkyl dithiocarbamate, butylated hydroxytoluene and barium dinonylnaphthalene sulfonate of 2:0.5:0.5), 0.7 parts of alkalinity improver (synthetic sulfonate T106), and 0.3 parts of antifoaming agent (polydimethylsiloxane);

[0076] The gear oil is prepared using the same method as in Example 1.

[0077] Example 5

[0078] A gear oil, by weight, comprises the following components: 84 parts base oil (34 parts Karamay hydrotreated base oil KH150BS, 25 parts 500SN, and 25 parts PAO10, with a mass ratio of 34:25:25), 10 parts viscosity index improver (ethylene-propylene copolymer, molecular weight 7500), and 0.0 parts magnetic additive (magnetic nano-ferric oxide, 0.0...). 0.5 parts of 1-0.05μm, 1.5 parts of power enhancer (isooctyl nitrate), 3 parts of composite synergist (2 parts of antimony dialkyl dithiocarbamate, 0.5 parts of butylated hydroxytoluene, 0.5 parts of barium dinonylnaphthalene sulfonate, with a mass ratio of antimony dialkyl dithiocarbamate, butylated hydroxytoluene and barium dinonylnaphthalene sulfonate of 2:0.5:0.5), 0.7 parts of alkalinity improver (calcium alkylphenol T115B) and 0.3 parts of antifoaming agent (polydimethylsiloxane);

[0079] The gear oil is prepared using the same method as in Example 1.

[0080] Comparative Example 1

[0081] The composition of the gear oil is the same as that in Example 1, except that the antifoaming agent is added in the form of conventional stirring during the preparation process to obtain the gear oil.

[0082] Comparative Example 2

[0083] A gear oil, by mass parts, comprises the following components: 79.7 parts base oil (31.7 parts Karamay hydrotreated base oil KH150BS, 23 parts 500SN, and 25 parts PAO10, with a mass ratio of Karamay hydrotreated base oil KH150BS, 500SN, and PAO10 of 31.7:23:25), 15 parts viscosity index improver (polyisobutylene, molecular weight 2500), and magnetic additive (magnetic... The composition includes: 0.5 parts of nano-ferric oxide (0.01-0.05μm), 1.5 parts of power enhancer (isooctyl nitrate), 3 parts of composite synergist (2 parts of antimony dialkyl dithiocarbamate, 0.5 parts of butylated hydroxytoluene, 0.5 parts of barium dinonylnaphthalene sulfonate, with a mass ratio of antimony dialkyl dithiocarbamate, butylated hydroxytoluene, and barium dinonylnaphthalene sulfonate of 2:0.5:0.5), and 0.3 parts of antifoaming agent (polydimethylsiloxane).

[0084] The gear oil is prepared by: (1) adding viscosity index improver, composite synergist, magnetic additive and power enhancer to base oil in sequence to obtain a mixture;

[0085] (2) The antifoaming agent is added to the mixture in the form of a spray to obtain gear oil; the flow rate of the spray is 1 mL / min.

[0086] Comparative Example 3

[0087] Commercially available imported gear oil for hybrid passenger vehicles.

[0088] Comparative Example 4

[0089] Gear oil for domestically sold hybrid passenger vehicles.

[0090] The physicochemical properties of gear oils in Examples 1-5 and Comparative Examples 1-3 were tested. Copper corrosion was tested according to GB / T5096, oxidation induction time according to SH-T 0719, liquid phase corrosion test according to GB / T 11143, and foaming property according to GBMT 12579. The results are shown in Table 1.

[0091] Table 1. Physicochemical properties of gear oils in Examples 1-5 and Comparative Examples 1-3

[0092]

[0093] The p of the gear oils tested in Examples 1-5 and Comparative Examples 1-3 B p D ZMZ, wear scar diameter, and coke formation tests were conducted, with p being tested according to GB / T 3142. B p D The ZMZ and wear scar diameter were tested according to SH / T 0300 for coke plate experiments, and the results are shown in Table 2.

[0094] Table 2 shows the p values ​​of gear oils in Examples 1-5 and Comparative Examples 1-3. B p D ZMZ, wear scar diameter and coking plate experiment

[0095]

[0096] As can be seen from Tables 1 and 2, the gear oil provided by this invention has excellent extreme pressure, anti-wear, copper strip corrosion, seawater corrosion and anti-foaming properties. Compared with commonly used fuel engine gear oil or electric engine gear oil, it can be very well matched with the needs of hybrid passenger car gear oil, maintaining its advantages and eliminating its disadvantages.

[0097] Example 2: SRV variable load friction and wear diagram of gear oil as shown in the figure. Figure 1 As shown, the temperature is 25℃, the amplitude is 1mm, and the frequency is 50Hz. (From...) Figure 1 It can be seen that the gear oil in Example 2 has excellent extreme pressure anti-wear properties, which reflects the noise reduction effect of the gear oil.

[0098] Example 2: Gear oil friction temperature rise experiment and friction coefficient diagram are shown below. Figure 2 As shown, C1 is the friction temperature rise curve, and B is the friction coefficient curve, where the load is 400N, the amplitude is 1mm, and the frequency is 50Hz.

[0099] The frictional temperature rise experiment and friction coefficient graph of gear oil in Comparative Example 3 are shown below. Figure 3 As shown, C1 is the friction temperature rise curve, and B is the friction coefficient curve, where the load is 400N, the amplitude is 1mm, and the frequency is 50Hz.

[0100] from Figure 2 and Figure 3 It can be seen that the friction coefficient of the gear oil in Comparative Example 3 is greater than that of the gear oil in Example 2. Especially after a period of use, its friction increases and the temperature rise is particularly obvious, which also reflects the fuel economy and energy saving of the gear oil of the present invention.

[0101] In summary, the gear oil provided by this invention can solve the mechanical noise problem in the vehicle when using a fuel engine, improve fuel economy, and at the same time, improve the driving performance and transmission efficiency of an electric motor. It also has a small temperature rise during friction lubrication, resulting in significant energy-saving effects.

[0102] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A gear oil comprising, by mass fraction, 70-84 parts of base oil, 10-20 parts of viscosity index improver, 0.3-1 part of magnetic additive, 1-2 parts of power enhancer, 3-6 parts of composite synergist, 0.5-2 parts of basicity improver, and 0.1-0.5 parts of anti-foaming agent; The magnetic additive is magnetic nano-ferric oxide or nano-MnZnFe2O4; The composite synergist comprises extreme pressure anti-wear agent, antioxidant, and corrosion inhibitor; The extreme pressure anti-wear agent is dibenzyl disulfide or dialkyl dithiocarbamic acid antimony; The antioxidant is dibutyl hydroxytoluene; The corrosion inhibitor is barium dinonylnaphthalene sulfonate; The power enhancer is isooctyl nitrate or ricinoleic acid diethanolamide borate; The preparation method of the gear oil comprises the following steps: (1) mixing the base oil, the viscosity index improver, the magnetic additive, the power enhancer, the composite synergist, and the basicity improver to obtain a mixture; (2) adding the anti-foaming agent in the form of spray to the mixture obtained in step (1) to obtain the gear oil.

2. The gear oil of claim 1, wherein The base oil has a kinematic viscosity at 40°C of 60-80 mm 2 / s, a density at 20°C of 0.8-0.95 g / cm 3 , a viscosity index of 90-130, a flash point of > 200°C, an oxidation induction time at 121°C of > 15 min, a p B > 200 N, a p D > 300 N, and a wear scar diameter of < 0.6 mm.

3. The gear oil of claim 1, wherein The viscosity index improver comprises at least one of polyisobutylene, polymethyl acrylate, and ethylene propylene copolymer.

4. The gear oil of claim 1, wherein The basicity improver comprises at least one of ashless basicity improver and ash basicity improver; The ashless basicity improver has the structural formula or ; R1 and R2 are independently C1-12 alkyl, R3 is C1-8 alkyl or substituted alkyl, and X is -OC3H5; The ash basicity improver comprises at least one of synthetic sulfonate, calcium alkylphenol, and salicylate.

5. The gear oil of claim 1, wherein The anti-foaming agent is polydimethylsiloxane. 6.The preparation method of the gear oil according to any one of claims 1-5, comprising the following steps: (1) mixing the base oil, the viscosity index improver, the magnetic additive, the power enhancer, the composite synergist, and the basicity improver to obtain a mixture; (2) adding the anti-foaming agent in the form of spray to the mixture obtained in step (1) to obtain the gear oil. 7.The gear oil according to any one of claims 1-5 or prepared by the preparation method of claim 6, used in the field of automobiles.

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