A new energy commercial vehicle transmission lubricant composition, its preparation and application

Abstract

This invention relates to the field of lubricating oil technology, and more particularly to a lubricating oil composition for transmissions of new energy commercial vehicles, its preparation, and its application. The lubricating oil composition comprises: an extreme pressure anti-wear agent and a copper corrosion inhibitor in a weight ratio of (4-15):1; the extreme pressure anti-wear agent is at least one selected from alkyl phosphite, isooctyl acid phosphate octadecylamine salt, triphenyl phosphate, pentadecyl calcium borate, and borated thiophosphate amine salt; the copper corrosion inhibitor is at least one selected from triazole derivatives, thiocyanate heterocyclic compounds, 2-mercaptobenzothiazole, and azacyclic succinic anhydride. This invention provides a lubricating oil composition suitable for transmissions of new energy commercial vehicles, exhibiting excellent motor material compatibility, electrical properties, copper corrosion protection, load-bearing capacity, and thermal oxidation stability, providing excellent compatibility and lubrication protection performance for transmission systems of new energy commercial vehicles.

Description

Technical Field

[0001] This invention relates to the field of lubricant technology, and in particular to a lubricant composition for a transmission of a new energy commercial vehicle, its preparation and application. Background Technology

[0002] Low-carbon development is an inevitable choice for the sustainable development of human society. As a non-renewable resource, oil has long been in a state of relative scarcity; therefore, the widespread adoption of new energy vehicles can, to some extent, reduce the huge demand for fossil fuels. The new energy vehicle industry will usher in unprecedented development opportunities, and with the development of the new energy industry, the development of new energy commercial vehicles will be even more rapid.

[0003] With the development of the new energy vehicle industry, early new energy vehicles typically used general-purpose motors, whose bearings and other components were similar to those in traditional fuel-powered vehicle transmission systems. However, in new electric vehicles, to achieve a more compact transmission system, reduce transmission components, minimize power loss, reduce component wear, and cool friction, the motor and gear transmission components are increasingly adopting an integrated drive system—the oil-cooled motor. Oil-cooled motors offer high cooling efficiency, increasing power density and torque density. Simultaneously, oil can contact the windings and magnetic materials, directly cooling heat sources and eliminating hot spots. It is non-magnetic and non-conductive, does not affect the motor's electromagnetic field characteristics, and has excellent insulation properties. Compared to water, oil has a higher boiling point and a lower freezing point, making it less prone to boiling at high temperatures and freezing at low temperatures, thus broadening its application range and effectively reducing motor size and improving overall vehicle efficiency.

[0004] The transmission fluid for new energy commercial vehicles needs to have good oxidation stability, compatibility with motor materials, electrical performance, and corrosion and rust prevention. In order to reduce transmission losses and extend driving range, the compatibility performance of motor materials needs to be balanced with the performance requirements of transmission fluid such as load-bearing capacity and copper corrosion. The harsh operating conditions place higher demands on the fluid. Summary of the Invention

[0005] In view of this, the present invention is proposed.

[0006] First, the present invention provides a lubricating oil composition comprising:

[0007] Extreme pressure anti-wear agent and copper corrosion inhibitor in a weight ratio of (4-15):1;

[0008] The extreme pressure anti-wear agent is at least one of alkyl phosphite, isooctyl acid phosphate octadecylamine salt, triphenyl phosphate, calcium pentadecyl borate, and borate thiophosphate amine salt.

[0009] The copper corrosion inhibitor is at least one of triazole derivatives, thio-acid heterocycles, 2-mercaptobenzothiazole, and azirionic succinic anhydride.

[0010] Through extensive compatibility studies, this invention has discovered that when extreme pressure anti-wear agents and copper corrosion inhibitors are formulated in the aforementioned proportions, the resulting lubricating oil composition exhibits outstanding gear load-bearing and bearing anti-wear protection performance. It can provide excellent extreme pressure anti-wear performance for the gear and bearing transmission systems of commercial vehicles, protecting the gear surfaces and extending their service life. Simultaneously, through balanced formulation, this oil has excellent copper corrosion rating and long-term copper corrosion protection performance, which is beneficial for the protection of motors in commercial vehicles.

[0011] Preferably, the weight ratio of the extreme pressure anti-wear agent to the copper corrosion inhibitor is (4-10):1.

[0012] Under the above proportions, the compatibility performance of motor materials, load-bearing and anti-wear protection performance and copper corrosion protection performance can be better balanced, and the overall performance of the prepared lubricating oil composition is better.

[0013] Preferably, the lubricating oil composition further includes a friction modifier and a dispersant;

[0014] The friction modifier is at least one of molybdenum naphthenate, oleate, molybdenum alkyl thiophosphate, molybdenum carbamate complex, benzotriazole fatty amine salt, and nitrogen-containing borate ester.

[0015] The dispersant is at least one of boronized succinimide, PIB succinic anhydride with a relative molecular weight of 950, polyisobutylene succinimide, and polyisobutylene succinate.

[0016] The present invention further discovers that when selecting the above-mentioned types of friction modifiers and dispersants, the copper corrosion inhibitor and extreme pressure anti-wear agent compounded in the above-mentioned specific ratio can promote the performance of friction modifiers and dispersants, so that the oil has excellent anti-friction performance and electrochemical performance, further improving the compatibility between motor materials and oil in the transmission of new energy commercial vehicles, while meeting the load requirements of transmission gears and bearings, which is more conducive to the stable operation of transmissions of new energy commercial vehicles.

[0017] Preferably, the lubricating oil composition further includes at least one of a rust inhibitor, an antioxidant, an antifoaming agent, and a viscosity index improver;

[0018] The rust inhibitor is at least one of the following: calcium petroleum sulfonate, dodecenyl succinate half ester, monoethanolamine borate, fatty acid diethanolamine, and heptadecanyl imidazoline succinate derivative.

[0019] The antioxidant is at least one of N-phenylnaphthylamine, dialkyldiphenylamine, dialkyldithiophosphate, and di-tert-butylphenyl methyl acrylate;

[0020] The antifoaming agent is at least one of trifluorosiloxane, polymethyl silicone oil, and polyacrylate.

[0021] The viscosity index improver is at least one of ethylene propylene oligomer, hydrogenated styrene diene copolymer, random copolymer of ethylene and α-olefin, and polymethyl methacrylate.

[0022] In the copper corrosion inhibitor, extreme pressure anti-wear agent, friction modifier, and dispersant system of the present invention, when the above-mentioned antioxidants are selected, the compounded lubricating oil composition has excellent antioxidant properties, which can effectively improve the oxidation stability of the oil, reduce sludge formation, and significantly improve the service life of the oil under high-temperature motor conditions. When the above-mentioned antifoaming agent is selected, the lubricating oil composition has excellent foam suppression ability, which can effectively reduce the situation of rapid foam increase after rapid stirring of the oil due to high-speed motor operation, and can significantly suppress foam generation, which is more conducive to the temperature operation of commercial vehicle motor systems. When the above-mentioned viscosity index improver is selected, it can further promote the lubricating oil composition to maintain the viscosity-temperature properties and shear resistance of the oil with low viscosity, so that the oil still has excellent viscosity retention ability after high-speed and long-cycle operation of commercial vehicle transmission systems, providing more oil film to ensure equipment lubrication.

[0023] By screening antifoaming agents, the selection of the above-mentioned antifoaming agents can further improve the air release capability of the oil and significantly reduce the impact of internal foam on the high-speed operation of the motor.

[0024] Preferably, based on the total weight of the lubricating oil composition (100%), the weight percentages of each component are as follows:

[0025] The extreme pressure anti-wear agent is 0.3% to 2.5%;

[0026] The copper corrosion inhibitor is 0.02% to 0.5%;

[0027] The friction modifier is 0.01% to 1%;

[0028] The dispersant is 0.3% to 3%;

[0029] The rust inhibitor is 0.01% to 0.5%;

[0030] The antioxidant is 0.1% to 0.75%;

[0031] The antifoaming agent is 0.0001% to 0.1%;

[0032] The viscosity index improver is 1% to 15%.

[0033] Preferably, based on the total weight of the lubricating oil composition (100%), the weight percentages of each component are as follows:

[0034] The extreme pressure anti-wear agent is 0.5% to 1.5%;

[0035] The copper corrosion inhibitor is 0.05% to 0.3%;

[0036] The friction modifier is 0.2% to 0.5%;

[0037] The dispersant is 0.5% to 3%;

[0038] The rust inhibitor is 0.05% to 0.3%;

[0039] The antioxidant is 0.2% to 0.5%;

[0040] The antifoaming agent is 0.001% to 0.1%;

[0041] The viscosity index improver is 3% to 10%.

[0042] Preferably, based on the total weight of the lubricating oil composition (100%), the weight percentages of each component are as follows:

[0043] The extreme pressure anti-wear agent is 0.75%;

[0044] The copper corrosion inhibitor is 0.1%;

[0045] The friction modifier is 0.25%;

[0046] The rust inhibitor is 0.05%;

[0047] The antioxidant is 0.3%;

[0048] The dispersant is 1.5%;

[0049] The antifoaming agent is 0.05%;

[0050] The viscosity index improver is 8%.

[0051] Preferably, the lubricating oil composition further includes a base oil; said base oil is at least one of HVI III+6, YU6, PAO10, and CTL10.

[0052] In some embodiments, the base oil is the balance, with the total weight of the lubricating oil composition being 100%.

[0053] Preferably, the base oil has a weight percentage of 85% to 98%.

[0054] Preferably, based on 100% of the total weight of the lubricating oil composition, the lubricating oil composition comprises the following components in weight percentages:

[0055]

[0056] Those skilled in the art can combine the above preferred solutions to obtain better embodiments.

[0057] Furthermore, the present invention provides a method for preparing the above-mentioned lubricating oil composition, comprising:

[0058] Except for the antifoaming agent, the raw materials are mixed at 50℃~70℃ according to the formula to obtain the premix;

[0059] The premix was kept at a temperature of 60℃±2℃, and an antifoaming agent was added and mixed to obtain the lubricating oil composition.

[0060] Furthermore, the present invention provides the application of the above-mentioned lubricating oil composition, or the lubricating oil composition prepared by the above-mentioned method, in the lubrication of the transmission system of new energy commercial vehicles.

[0061] Preferably, the present invention provides the application of the above-mentioned lubricating oil composition or the lubricating oil composition prepared by the above-mentioned method in the lubrication of the transmission system of an oil-cooled new energy commercial vehicle gearbox.

[0062] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0063] This invention provides a lubricating oil composition suitable for transmissions of new energy commercial vehicles, which has excellent motor material compatibility, electrical properties, copper corrosion protection, load-bearing capacity and thermal oxidation stability, providing excellent compatibility and lubrication protection performance for transmission systems of new energy commercial vehicles. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0065] Where specific techniques or conditions are not specified in the examples, they shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels.

[0066] In the following examples, the viscosity grades are formulated in the range of 75W-80, 75W-85, and 75W-90.

[0067] Examples 1-4

[0068] This embodiment provides a transmission lubricant composition for new energy commercial vehicles, and its preparation method is as follows:

[0069] Raw material preparation: Each component is prepared according to the mass fraction in Table 1.

[0070] (1) Except for the antifoaming agent, all components are stirred at 65°C for 3 hours to obtain a premix;

[0071] (2) Keep the temperature of the premix at 60℃±2℃, add antifoaming agent, and continue stirring for 2 hours.

[0072] The prepared lubricating oil composition was tested, and the typical physicochemical properties are shown in Table 2.

[0073] Table 1 Lubricating Oil Compositions

[0074]

[0075]

[0076]

[0077] Table 2. Test results of lubricating oil compositions

[0078]

[0079]

[0080] Comparative Examples 1-2

[0081] This comparative example provides a lubricating oil composition whose preparation method differs from that of Example 1 only in that the proportions of each component in Example 1 are replaced with those shown in Table 3 below, and the test results of the prepared lubricating oil composition are shown in Table 4.

[0082] Table 3 Comparative Examples of Lubricating Oil Compositions

[0083]

[0084] Table 4 Comparative Performance of Lubricating Oil Compositions

[0085]

[0086]

[0087] The test results above show that if the ratio of extreme pressure anti-wear agent to copper corrosion inhibitor is not appropriate, although the basic physical and chemical performance requirements such as low temperature can be met, the corrosion and rust of copper sheets will be significantly worse, and the electrical performance and motor material compatibility will not be met, making it unsuitable for use in the gearbox of new energy commercial vehicles.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lubricating oil composition for a transmission system of a new energy commercial vehicle, characterized in that, Based on 100% of the total weight of the lubricating oil composition for the transmission system of new energy commercial vehicles, the lubricating oil composition for the transmission system of new energy commercial vehicles comprises the following components by weight percentage: Isooctyl acid phosphate octadecylamine salt 0.2~0.3%; Triphenyl phosphate 0.4~0.6%; Triazole derivatives 0.05~0.1%; 2-Mercaptobenzothiazole 0.05~0.15%; Benztriazole fatty amine salts: 0.2-0.3%; Heptadecanyl imidazoline succinic acid derivatives: 0.02~0.08%; N-Phenylanthylamine 0.2~0.5%; Boronized succinimide 0.5~3%; Polymethyl methacrylate 5-10%; Polymethyl silicone oil 0.001%~0.01%; PAO10 balance.

2. The method for preparing the lubricating oil composition for the transmission system of new energy commercial vehicles according to claim 1, characterized in that, include: Except for the antifoaming agent polymethyl silicone oil, the raw materials are mixed at 50℃~70℃ according to the formula to obtain a premix; The premix was kept at a temperature of 60℃±2℃, and antifoaming agent polymethyl silicone oil was added to obtain the new energy commercial vehicle transmission system lubricating oil composition.

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