Energy-saving gear lubricating oil and preparation method thereof

Abstract

The invention discloses energy-saving gear lubricating oil and a preparation method thereof, and belongs to the technical field of lubricating oil, the energy-saving gear lubricating oil comprises the following components by mass: 80%-95% of base oil, 2%-18% of a viscosity index improver, 0.1%-1% of a pour point depressant, 0.05%-0.5% of an antioxidant, 0.5%-5% of an anti-wear reagent at extreme pressure, 0.1%-3% of a friction modifier, 0.05%-2.5% of an antirust agent, and 0.005%-0.03% of an antifoaming agent. The anti-wear reagent at extreme pressure and the friction modifier have a synergistic effect, so that the anti-wear performance of an oil product can be effectively improved, the friction coefficient is reduced, the transmission efficiency of a gear is improved, and the energy consumption is reduced; the base oil and the viscosity index improver adopted by the invention have excellent low-temperature performance, the viscosity-temperature performance of the oil product is greatly improved, the required oil film strength is achieved along with the change of working conditions, the lubrication of a vehicle transmission system is fully met, and the energy consumption is saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of lubricating oils, and in particular, relates to an energy-saving gear lubricating oil and a preparation method thereof. Background Art

[0002] In recent years, with the expansion of social production scale and the shortage of various resources worldwide, energy conservation and environmental protection have become one of the important topics of global concern. The selection of energy-saving lubricants can achieve significant energy-saving effects, so that the vehicle transmission and drive axle gears are in a mixed lubrication state with both elastic fluid dynamic lubrication and boundary lubrication, thereby achieving the purpose of energy saving and consumption reduction. Gear lubricants mainly play the role of lubricating gears and bearings, preventing wear and rust, and helping gears to dissipate heat. They are used in the transmission parts of various vehicles. There are differences between them and engine oil in terms of usage conditions, their own composition and performance.

[0003] Gear oil mainly focuses on performance under high temperature and high pressure, because the pressure between gears is much higher than that of the engine, and the operating temperature is also much higher. If the gear oil does not have such good performance, once the oil film is not on the gear, it is easy to have corrosion and wear problems. Adding energy-saving and friction-reducing additives is conducive to greatly improving transmission efficiency. Multi-grade gear oil with a large span has excellent low-temperature performance and suitable high-temperature performance. It can play the dual role of energy transfer medium and lubricating medium, while reducing the operating force of low-temperature speed change, reducing the starting load, improving fuel economy, and greatly extending the life of gears. At the same time, it also has the characteristics of good thermal oxidation stability, high-temperature durability, component cleanliness, and has good energy-saving effects, but the energy-saving and friction-reducing effects of vehicle gear oil products disclosed in the prior art are not significant. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide an energy-saving gear lubricant and a preparation method thereof, so as to achieve the purpose of the lubricant of the present invention to meet the lubrication of the vehicle transmission system, improve the transmission efficiency of the gears, and save energy and reduce consumption.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An energy-saving gear lubricant, which comprises, by mass percentage:

[0007] 80% to 95% base oil, 2% to 18% viscosity index improver, 0.1% to 1% pour point depressant, 0.05% to 0.5% antioxidant, 0.5% to 5% extreme pressure antiwear agent, 0.1% to 3% friction modifier, 0.05% to 2.5% rust inhibitor, 0.005% to 0.03% defoaming agent.

[0008] Furthermore, the mineral oil includes Group III hydrogenated base oil and synthetic oil, and the synthetic oil is one or more of poly-α-olefin and synthetic ester.

[0009] More preferably, the synthetic ester is one or more of adipic acid ester, dioctyl sebacate and pentaerythritol ester.

[0010] Furthermore, the pour point depressant is polymethacrylate.

[0011] Furthermore, the antioxidant is two or more of 2,6-di-tert-butyl-p-methylphenol, 4,4'-methylenebis(2,6-di-tert-butyl)phenol, p,p'-diisooctyldiphenylamine, octyldiphenylamine, octyl-N-phenyl-α-naphthylamine and butyl hydroxycinnamate.

[0012] Furthermore, the extreme pressure anti-wear agent is one or two or more of dithiophosphate, sulfided olefin, dipentyl dithiocarbamate and methylene bis (dibutyl dithiocarbamate).

[0013] Further, the friction modifier includes an organic molybdenum friction modifier and an ester component;

[0014] More preferably, the ester component is one or more of di-n-butyl phosphite, dialkyl dithiophosphate, and borate.

[0015] More preferably, the organic molybdenum friction modifier is prepared by the following method:

[0016] 1. Take N(omega)-methyltryptamine, carbon disulfide and molybdenum trioxide as raw materials, stir vigorously under a certain amount of solvent, and add carbon disulfide dropwise (exothermic reaction, control the dropping speed during the dropping process so that the system temperature does not exceed 50°C).

[0017] 2. After the addition is complete, the mixture is refluxed for 5 to 8 hours. After washing, extraction, drying, and reduced pressure distillation, the product is obtained, namely, the organic molybdenum friction modifier. The structural formula is:

[0018]

[0019] Organic molybdenum friction modifier is an important lubricating additive, mainly used to improve the friction and anti-wear properties of lubricating oil. Its mechanism of action mainly includes the following aspects:

[0020] Formation of chemical reaction film: Under high load conditions, the organic molybdenum additive reacts chemically on the surface of the friction pair to generate compounds such as MOS2, which are adsorbed and deposited on the friction surface to form a protective film, thereby reducing friction and wear.

[0021] Formation of physical adsorption film: Organic molybdenum additives form a protective film on the metal surface through physical adsorption to reduce friction and wear. The thickness and strength of this protective film are related to factors such as the polar group of the additive and the length of the carbon-hydrogen straight chain.

[0022] Extreme pressure performance: Under high temperature and high pressure environment, organic molybdenum additives can maintain excellent performance, effectively cope with extreme working conditions, and ensure the stable operation of mechanical equipment.

[0023] The organic molybdenum friction modifier provided by the present invention not only has the technical effects in the above-mentioned aspects, but also has different compatibility with oil products due to different lengths of carbon-hydrogen straight chains from the perspective of molecular structure. Compared with the existing organic molybdenum (which cannot be well dissolved in oil), the present invention can improve its solubility in lubricating oil by increasing the length of carbon-hydrogen straight chains, and can better play the role of organic molybdenum. In addition, the organic molybdenum molecular side chains of the present invention also contain aromatic hydrocarbon derivatives, which can improve the antioxidant performance and can play a synergistic role with the antioxidant in the lubricating oil, that is, it corresponds to high temperature conditions and improves the service life of the equipment.

[0024] Furthermore, the rust inhibitor is selected from one or more of linear dodecenylsuccinic acid, alkenyl succinate, neutral calcium dinonylnaphthalene sulfonate and sodium petroleum sulfonate.

[0025] Furthermore, the defoaming agent is one or both of oil-soluble polyethers and polyether-modified silicones.

[0026] A method for preparing energy-saving gear lubricating oil comprises the following steps:

[0027] The base oil is mechanically stirred and heated to 70-80°C in a reactor;

[0028] Add viscosity index improver, pour point depressant, antioxidant, extreme pressure anti-wear agent, friction modifier, rust inhibitor and defoamer in sequence, stir for 2.5 hours, and keep the temperature at about 70°C to obtain semi-finished gear oil;

[0029] The semi-finished gear oil after temperature curing is cooled to about 50°C, filtered at 0.2MPa positive pressure, and naturally cooled to room temperature to obtain the finished gear lubricating oil.

[0030] Beneficial effects of the present invention:

[0031] 1. The extreme pressure anti-wear agent and friction modifier used in the present invention have a synergistic effect, which can effectively improve the anti-wear performance of the oil, reduce the friction coefficient, improve the transmission efficiency of the gears, and save energy consumption.

[0032] 2. The addition of the homemade organic molybdenum friction modifier in the present invention can not only improve the friction performance and anti-wear performance of the lubricating oil to achieve the purpose of energy saving, but also has good solubility in the lubricating oil, can give full play to the role of organic molybdenum, and can complement the antioxidant component to enhance the high-temperature antioxidant performance of the lubricating oil.

[0033] 3. The base oil and viscosity index improver used in the present invention have excellent low-temperature performance, greatly improving the viscosity-temperature performance of the oil product, achieving the required oil film strength as the working conditions change, fully meeting the lubrication of the vehicle transmission system, and saving energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] Figure 1 It is a line graph of the friction coefficient of the lubricating oil obtained in Examples 2 to 4 of the present invention and Comparative Examples 1 to 2;

[0036] Figure 2 It is a bar chart of the FZG transmission efficiency of the lubricating oils obtained in Examples 2 to 4 of the present invention and Comparative Examples 1 to 2. DETAILED DESCRIPTION

[0037] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0038] Embodiment 1

[0039] Preparation of organic molybdenum friction modifier:

[0040] Take N(omega)-methyltryptamine, carbon disulfide and molybdenum trioxide in a molar ratio of 1:2:1 as raw materials, add carbon disulfide dropwise under vigorous stirring under a certain amount of tetrahydrofuran (exothermic reaction, control the dropping speed during the dropping process so that the system temperature does not exceed 50°C).

[0041] After the dropwise addition is completed, the mixture is refluxed for 5 to 8 hours, and the product, namely the organic molybdenum friction modifier, is obtained after water washing, extraction, drying and reduced pressure distillation.

[0042] Embodiment 2

[0043] 80kg of Class III hydrogenated base oil 10#, 10kg of PAO50 and 5kg of pentaerythritol ester were added to a reactor, mechanically stirred and heated to 70°C; then 2.5kg of viscosity index improver VISCOPLEX 7-310 (Evonik, Germany), 0.3kg of pour point depressant VISCOPLEX 1-180 (Evonik, Germany), 0.15kg of 4,4'-methylenebis(2,6-di-tert-butyl)phenol and 0.2kg of p-, p-'-diisooctyldiphenylamine, 1.5kg of dithiophosphate, 0.5kg of dipentyl dithiocarbamate, 0.3kg of di-n-butyl phosphite, 0.05kg of organic molybdenum friction modifier, 1.5kg of olefin succinate, 0.01kg BAN155 compound defoamer is stirred at 70℃ for 2.5 hours to obtain semi-finished gear oil. When the oil is cooled to about 50℃, it is filtered at 0.2MPa positive pressure and naturally cooled to room temperature to obtain finished gear lubricating oil.

[0044] Embodiment 3

[0045] 82kg PAO10 and 6kg dioctyl sebacate were added to the reactor, mechanically stirred and heated to 70°C; then 5kg viscosity index improver VISCOPLEX 0-051 (Evonik, Germany) and 2kg DS1100 (Daelim Synol, South Korea), 0.3kg pour point depressant VISCOPLEX 1-248 (Evonik, Germany), 0.15kg 4,4'-methylenebis(2,6-di-tert-butyl)phenol and 0.25kg octyl diphenylamine, 0.7kg sulfide olefin, 1.5kg methylenebis(dibutyl dithiocarbamate), 0.5kg dialkyl dithiophosphate, 0.05kg organic molybdenum friction modifier, 2kg sodium petroleum sulfonate, 0.02kg HL-935 defoamer, stir at 70℃ for 2.5 hours to get semi-finished gear oil, wait for the oil to cool to about 50℃, filter at 0.2MPa positive pressure, cool naturally to room temperature to get finished gear lubricant.

[0046] Embodiment 4

[0047] 10kg Class III hydrogenated base oil 10#, 77.5kg PAO10 and 5kg dioctyl sebacate were added to the reactor, mechanically stirred and heated to 70°C; then 3kg viscosity index improver SCR-9600 (Shenyang Great Wall Company), 0.3kg pour point depressant VISCOPLEX 1-248 (Germany Evonik Company), 0.1kg 4,4'-methylenebis(2,6-di-tert-butyl)phenol and 0.2kg octyl-N-phenyl-α-naphthylamine, 1.5kg dipentyl dithiocarbamate, 0.5kg boric acid ester, 0.05kg organic molybdenum friction modifier, 2kg neutral calcium dinonylnaphthalenesulfonate, 0.02kg HQT1246 compound defoamer is stirred at 70℃ for 2.5 hours to obtain semi-finished gear oil. When the oil is cooled to about 50℃, it is filtered at 0.2MPa positive pressure and naturally cooled to room temperature to obtain finished gear lubricating oil.

[0048] Embodiment 5

[0049] 45kg of Class III hydrogenated base oil 100N, 40kg of PAO20 and 5kg of pentaerythritol ester were added to a reactor, mechanically stirred and heated to 70°C; then 5kg of viscosity index improver VISCOPLEX 0-051, 0.3kg of pour point depressant VISCOPLEX 1-180, 0.1kg of 2,6-di-tert-butyl-p-methylphenol, 0.2kg of octyl diphenylamine and 0.1kg of butyl hydroxycinnamate, 0.5kg of sulfided olefins, 2kg of dialkyl dithiophosphate, 0.05kg of organic molybdenum friction modifier, 2kg of neutral calcium dinonylnaphthalenesulfonate, and 0.01kg of BAN155 compound defoamer were added in sequence, and stirred at 70°C for 2.5 hours to obtain a semi-finished gear oil. When the oil product was cooled to about 50°C, it was filtered at a positive pressure of 0.2MPa and naturally cooled to room temperature to obtain a finished gear lubricant.

[0050] Comparative Example 1: Mobil fully synthetic gear oil 75W-90 on the market was used to compare with the embodiment using the same analysis and detection method.

[0051] Comparative Example 2: Shell Spirax S6 AXME 75W-90 gear oil on the market was used for comparison with the embodiment using the same analysis and detection method.

[0052] The gear oils of Examples 2 to 5 and Comparative Examples 1 to 2 were tested for kinematic viscosity at different temperatures according to GB / T 265, viscosity index was obtained according to GB / T 1995, copper corrosion was tested according to GB / T 5096, pour point was tested according to GB / T 3535, KRL shear stability was tested according to NB / SH / T 0845, wear spot diameter was tested according to NB / SH / T 0189, maximum no-seizure load PB value and sintering load PD value were tested according to GB / T3142, friction coefficient was tested according to SH / T 0762, and FZG transmission efficiency was tested according to FVA345. The results are shown in Tables 1 and 2. Figure 1-2 As shown:

[0053] Table 1

[0054]

[0055]

[0056] The energy-saving gear lubricating oil of the present invention is prepared by the synergistic effect of various components, especially the preferred extreme pressure anti-wear agent and friction modifier, the preferred suitable base oil and ultra-stable viscosity index improver, and the preferred antioxidant, rust inhibitor, pour point depressant and anti-foaming agent, using the best preparation process technology. The gear oil of the present invention has excellent low temperature performance and anti-wear performance, greatly improves the viscosity-temperature performance of the oil product, and reduces the friction coefficient, so as to achieve the purpose of the lubricating oil of the present invention to meet the lubrication of the vehicle transmission system, improve the transmission efficiency of the gear, and save energy and reduce consumption.

[0057] The above specific implementation method part specifically introduces the analytical method involved in the present invention. It should be noted that the above introduction is only to help those skilled in the art better understand the method and ideas of the present invention, rather than limiting the relevant content. Without departing from the principle of the present invention, those skilled in the art may also make appropriate adjustments or modifications to the present invention, and the above adjustments and modifications shall also fall within the scope of protection of the present invention.

Claims

1. An energy-saving gear lubricant, characterized in that: In terms of mass percentage, its ingredients include: 80% to 95% base oil, 2% to 18% viscosity index improver, 0.1% to 1% pour point depressant, 0.05% to 0.5% antioxidant, 0.5% to 5% extreme pressure antiwear agent, 0.1% to 3% friction modifier, 0.05% to 2.5% rust inhibitor, 0.005% to 0.03% defoaming agent.

2. The energy-saving gear lubricant according to claim 1, characterized in that: The mineral oil includes Group III hydrogenated base oil and synthetic oil, and the synthetic oil is one or more of polyalphaolefin and synthetic ester.

3. The energy-saving gear lubricant according to claim 1, characterized in that: The pour point depressant is polymethacrylate; The antioxidant is two or more of 2,6-di-tert-butyl-p-methylphenol, 4,4'-methylenebis(2,6-di-tert-butyl)phenol, p,p'-diisooctyldiphenylamine, octyldiphenylamine, octyl-N-phenyl-α-naphthylamine and butyl hydroxycinnamate; The extreme pressure anti-wear agent is one or two or more of dithiophosphate, sulfided olefin, dipentyl dithiocarbamate and methylene bis (dibutyl dithiocarbamate).

4. The energy-saving gear lubricant according to claim 1, characterized in that: The friction modifier includes an organic molybdenum friction modifier and an ester component.

5. The energy-saving gear lubricant according to claim 4, characterized in that: The ester component is one or more of di-n-butyl phosphite, dialkyl dithiophosphate, and borate.

6. The energy-saving gear lubricant according to claim 4, characterized in that: The organic molybdenum friction modifier is prepared by the following method: 1) Take N(omega)-methyltryptamine, carbon disulfide and molybdenum trioxide as raw materials, add carbon disulfide dropwise under vigorous stirring under a certain amount of solvent, and control the dropping speed during the dropping process so that the system temperature does not exceed 50°C; 2) After the dropwise addition is completed, the mixture is refluxed for 5 to 8 hours, and the product is obtained after washing, extraction, drying, and reduced pressure distillation, i.e., an organic molybdenum friction modifier, having the structural formula:

7. The energy-saving gear lubricant according to claim 1, characterized in that: The rust inhibitor is selected from one or more of linear dodecenylsuccinic acid, alkenyl succinate, neutral calcium dinonylnaphthalene sulfonate and sodium petroleum sulfonate.

8. The energy-saving gear lubricant according to claim 1, characterized in that: The defoaming agent is one or both of oil-soluble polyethers and polyether-modified silicons.

9. The method for preparing an energy-saving gear lubricant according to claim 1, characterized in that: The steps include: The base oil is mechanically stirred and heated to 70-80°C in a reactor; Add viscosity index improver, pour point depressant, antioxidant, extreme pressure anti-wear agent, friction modifier, rust inhibitor and defoamer in sequence, stir for 2.5 hours, and keep at 70°C for warming to obtain semi-finished gear oil; The semi-finished gear oil after temperature curing is cooled to 50°C, filtered at 0.2MPa positive pressure, and naturally cooled to room temperature to obtain the finished gear lubricating oil.

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