New energy commercial vehicle gearbox lubricating oil composition and preparation and application thereof

Abstract

The invention relates to the technical field of lubricating oil, in particular to a new energy commercial vehicle gearbox lubricating oil composition and preparation and application thereof. 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 anti-wear reagent at extreme pressure is at least one of alkyl phosphite, isooctyl acid phosphate octadecylamine salt, triphenyl phosphate, calcium pentadecyl borate and boronized thiophosphate amine salt; the copper corrosion inhibitor is at least one of a triazole derivative, a sulfur-nitrogen heterocyclic ring, 2-mercaptobenzothiazole and azacyclobutanedioic anhydride. The lubricating oil composition suitable for the gearbox of the new energy commercial vehicle has excellent motor material compatibility, electrical performance, copper corrosion protection, bearing performance and thermal oxidation stability, and provides excellent compatibility and lubricating protection performance for a gearbox system of the new energy commercial vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating oils, and in particular to a new energy commercial vehicle gearbox lubricating oil composition and a preparation method and application thereof. Background Art

[0002] Low carbon is an inevitable choice for the sustainable development of human society. As a non-renewable resource, oil has been in a relatively scarce state for a long time. Therefore, the popularization of new energy vehicles can reduce the huge demand for fossil fuels to a certain extent. The new energy vehicle industry will usher in unprecedented development opportunities. With the development of the new energy industry, the subsequent development of new energy commercial vehicles will be more rapid.

[0003] With the development of the new energy vehicle industry, early new energy vehicles usually use general-purpose motors, and the bearings and other parts used in these motors are similar to those of traditional fuel vehicle transmission systems. In new electric vehicles, in order to make the transmission system structure more compact, reduce transmission components, minimize power loss, slow down component wear, and cool friction, the motor and gear transmission parts have gradually adopted an integrated drive system, namely, an oil-cooled motor. The oil-cooled motor has high cooling efficiency and can improve the power density and torque density of the motor; at the same time, the oil can contact the winding and magnetic materials, directly cool the heat source, eliminate hot spots, and is non-magnetic and non-conductive, which does not affect the electromagnetic field characteristics of the motor and has good insulation performance; compared with water, oil has a high boiling point and a low freezing point, and is not easy to boil at high temperatures and not easy to freeze at low temperatures. It has a wider range of applications and can effectively reduce the size of the motor and improve the efficiency of the vehicle.

[0004] The transmission oil for new energy commercial vehicles must have good oxidation stability, motor material compatibility, electrical properties, and corrosion and rust resistance. In order to reduce transmission losses and extend cruising range, the motor material compatibility needs to be balanced with the transmission oil load-bearing, copper corrosion and other performance requirements. Harsh working conditions place higher demands on oil products. 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] An extreme pressure anti-wear agent and a copper corrosion inhibitor in a weight ratio of (4-15):1;

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

[0009] The copper corrosion inhibitor is at least one of triazole derivatives, sulfur-nitrogen heterocycles, 2-mercaptobenzothiazole, and azetidinedioic anhydride.

[0010] Through a large number of compatibility studies, the present invention has found that when the extreme pressure anti-wear agent and the copper corrosion inhibitor are used in the above-mentioned proportion, the prepared lubricating oil composition has outstanding gear load-bearing and bearing anti-wear protection performance, and can provide excellent extreme pressure anti-wear performance for commercial vehicle gear and bearing transmission systems, protect the tooth surface and extend the service life; at the same time, through the compatibility balance, the oil product has an excellent copper corrosion rating and long-term copper corrosion protection performance, which is beneficial to the protection of commercial vehicle motors.

[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 ratio, the motor material compatibility, load-bearing and anti-wear protection performance and copper corrosion protection performance can be better balanced, and the comprehensive performance of the prepared lubricating oil composition is better.

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

[0014] The friction modifier is at least one of molybdenum cyclohexaneate, oleate, molybdenum alkylthiophosphate, molybdenum carbamate complex, benzotriazole fatty amine salt, and nitrogen-containing borate;

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

[0016] The present invention further discovered that when the above-mentioned types of friction modifiers and dispersants are selected, the copper corrosion inhibitor and extreme pressure anti-wear agent compounded in the above-mentioned specific proportion can promote the performance of the friction modifier and dispersant, so that the oil product has excellent anti-friction and electrochemical properties, further improving the compatibility of motor materials and oil products in the gearbox of new energy commercial vehicles, and at the same time can meet the load-bearing requirements of gearbox gears and bearings, which is more conducive to the stable operation of the gearbox of new energy commercial vehicles.

[0017] Preferably, the lubricating oil composition further comprises 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 calcium petroleum sulfonate, dodecenyl succinic acid half ester, monoethanolamine borate, fatty acid diethanolamine, and heptadecenyl imidazoline succinic acid derivatives;

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

[0020] The anti-foaming agent is at least one of trifluorosilicone, polymethyl silicone oil and polyacrylate;

[0021] The viscosity index improver is at least one of ethylene propylene oligomers, hydrogenated styrene diene copolymers, random copolymers of ethylene and α-olefins, and polymethacrylate.

[0022] In the copper corrosion inhibitor, extreme pressure anti-wear agent, friction modifier and dispersant system of the present invention, when the above-mentioned antioxidant types are selected, the compounded lubricating oil composition has excellent antioxidant properties, can effectively improve the oxidation stability of the oil, reduce sludge generation, and has a significant effect on improving the life of the oil under high-temperature conditions of the motor; when the above-mentioned anti-foaming agent is selected, the lubricating oil composition has excellent foam inhibition ability, can effectively reduce the situation where the foam increases sharply after the oil is quickly stirred due to the high-speed operation of the motor, can significantly inhibit the generation of foam, and is more conducive to the temperature operation of the commercial vehicle motor system; when the above-mentioned viscosity index improver is selected, it can further promote the lubricating oil composition to maintain the viscosity-temperature performance and shear resistance of the lower viscosity oil, so that the oil still has excellent viscosity retention ability after the commercial vehicle transmission system operates at high speed for a long period of time, and provides more oil film to ensure equipment lubrication.

[0023] By screening the anti-foaming agents, the selection of the above anti-foaming agents can further improve the air release ability of the oil and significantly reduce the impact of the foam inside the oil on the high-speed operation of the motor.

[0024] Preferably, based on the total weight of the lubricating oil composition being 100%, the weight percentages of the components are respectively:

[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 being 100%, the weight percentages of the components are respectively:

[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 being 100%, the weight percentages of the components are respectively:

[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 comprises a base oil; the base oil is at least one of HVI III+6, YU6, PAO10 and CTL10.

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

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

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

[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 lubricating oil composition, comprising:

[0058] Except for the antifoaming agent, the raw materials are mixed according to the proportion at 50°C to 70°C to obtain a premix;

[0059] The premix is ​​maintained at a temperature of 60° C.±2° C., an antifoaming agent is added, and the mixture is mixed to obtain the lubricating oil composition.

[0060] Furthermore, the present invention provides the use of the above lubricating oil composition, or the lubricating oil composition prepared by the above preparation method, in the lubrication of a transmission system of a new energy commercial vehicle.

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

[0062] Compared with the prior art, the present invention has the following beneficial effects:

[0063] The present invention provides a lubricating oil composition suitable for a new energy commercial vehicle gearbox, which has excellent motor material compatibility, electrical properties, copper corrosion protection, load-bearing performance and thermal oxidation stability, and provides excellent compatibility and lubrication protection performance for the gearbox system of a new energy commercial vehicle. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are 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.

[0065] If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the field or the product instructions are used. If no manufacturer is specified for the reagents or instruments used, they are all conventional products that can be purchased through regular channels.

[0066] The viscosity grades in the following examples are 75W-80, 75W-85 and 75W-90.

[0067] Embodiments 1 to 4

[0068] This embodiment provides a new energy commercial vehicle gearbox lubricating oil composition, and the preparation method thereof is as follows:

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

[0070] (1) Stir all components except the antifoaming agent at 65° C. for 3 hours to prepare a premix;

[0071] (2) Maintain the temperature of the premix at 60°C ± 2°C, add an antifoaming agent, and continue stirring for 2 hours.

[0072] The prepared lubricating oil composition was tested, and various typical physical and chemical indicators are shown in Table 2.

[0073] Table 1 Lubricating oil composition

[0074]

[0075]

[0076]

[0077] Table 2 Lubricating oil composition test results

[0078]

[0079]

[0080] Comparative Examples 1-2

[0081] This comparative example provides a lubricating oil composition, the preparation method of which is different from that of Example 1 only in that the ratio of each component in Example 1 is replaced by the ratio shown in Table 3 below, and the test results of the prepared lubricating oil composition are shown in Table 4.

[0082] Table 3 Lubricating oil composition comparative example

[0083]

[0084] Table 4 Lubricating oil composition comparative performance

[0085]

[0086]

[0087] It can be seen from the above test results that if the ratio of extreme pressure anti-wear agent and copper corrosion inhibitor is inappropriate, 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 are not met, and it cannot be used in new energy commercial vehicle gearboxes.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lubricating oil composition, characterized in that: include: 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 of alkyl phosphites, isooctyl acid phosphate octadecylamine salt, triphenyl phosphate, pentadecyl calcium borate, and borated thiophosphate amine salt; The copper corrosion inhibitor is at least one of triazole derivatives, sulfur-nitrogen heterocycles, 2-mercaptobenzothiazole, and azetidinedioic anhydride.

2. The lubricating oil composition according to claim 1, characterized in that The weight ratio of the extreme pressure anti-wear agent to the copper corrosion inhibitor is (4-10):

1.

3. The lubricating oil composition according to claim 1, characterized in that Also included are friction modifiers and dispersants; The friction modifier is at least one of molybdenum cyclopentaneate, oleate, molybdenum alkylthiophosphate, molybdenum carbamate complex, benzotriazole fatty amine salt, and nitrogen-containing borate; The dispersant is at least one of boronated succinimide, PIB succinic anhydride with a relative molecular weight of 950, polyisobutylene succinimide, and polyisobutylene succinate.

4. The lubricating oil composition according to claim 3, characterized in that Also includes at least one of a rust inhibitor, an antioxidant, an antifoaming agent, and a viscosity index improver; The rust inhibitor is at least one of calcium petroleum sulfonate, dodecenyl succinic acid half ester, monoethanolamine borate, fatty acid diethanolamine, and heptadecenyl imidazoline succinic acid derivatives; The antioxidant is at least one of N-phenylnaphthylamine, dialkyl diphenylamine, dialkyl dithiophosphate, and di-tert-butylphenyl methyl acrylate; The anti-foaming agent is at least one of trifluorosilicone, polymethyl silicone oil and polyacrylate; The viscosity index improver is at least one of ethylene propylene oligomers, hydrogenated styrene diene copolymers, random copolymers of ethylene and α-olefins, and polymethacrylate.

5. The lubricating oil composition according to claim 4, characterized in that Taking the total weight of the lubricating oil composition as 100%, the weight percentages of the components are: The extreme pressure anti-wear agent is 0.3% to 2.5%; The copper corrosion inhibitor is 0.02% to 0.5%; The friction modifier is 0.01% to 1%; The dispersant is 0.3% to 3%; The rust inhibitor is 0.01% to 0.5%; The antioxidant is 0.1% to 0.75%; The antifoaming agent is 0.0001% to 0.1%; The viscosity index improver is 1% to 15%.

6. The lubricating oil composition according to claim 5, characterized in that Taking the total weight of the lubricating oil composition as 100%, the weight percentages of the components are: The extreme pressure anti-wear agent is 0.5% to 1.5%; The copper corrosion inhibitor is 0.05% to 0.3%; The friction modifier is 0.2% to 0.5%; The dispersant is 0.5% to 3%; The rust inhibitor is 0.05% to 0.3%; The antioxidant is 0.2% to 0.5%; The antifoaming agent is 0.001% to 0.1%; The viscosity index improver is 3% to 10%.

7. The lubricating oil composition according to any one of claims 4 to 6, characterized in that It also includes a base oil; the base oil is at least one of HVI III+6, YU6, PAO10, and CTL10.

8. The lubricating oil composition according to claim 7, characterized in that Taking the total weight of the lubricating oil composition as 100%, the lubricating oil composition comprises the following components in percentage by weight:

9. The method for preparing the lubricating oil composition according to claim 7 or 8, characterized in that: include: Except for the antifoaming agent, the raw materials are mixed according to the proportion at 50°C to 70°C to obtain a premix; The premix is ​​maintained at a temperature of 60° C.±2° C., an antifoaming agent is added, and the mixture is mixed to obtain the lubricating oil composition.

10. Use of the lubricating oil composition according to any one of claims 1 to 8, or the lubricating oil composition prepared by the preparation method according to claim 9, in lubrication of a transmission system of a new energy commercial vehicle.

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