New energy oil-cooled motor reduction gearbox oil and preparation and application thereof

Abstract

The application discloses a new energy oil-cooled motor reduction gearbox oil and a preparation and application thereof, and components and contents of the new energy oil-cooled motor reduction gearbox oil are as follows in percentage by mass: viscosity index improver 4.5-7.0%; detergent 0.05-0.2%; dispersant 4.5-6.0%; extreme pressure anti-wear agent 0.5-1.5%; anti-rust agent 0.05-0.3%; antioxidant 0.1-1.0%; metal deactivator 0.01-0.2%; anti-foaming agent 0.01-0.03%; hydrogenated base oil 70-85%; and ester oil 2-13%. The lubricating oil composition provided by the application is stable in performance and can meet lubricating requirements of a reduction gearbox system under a new energy oil-cooled motor structure.

Description

Technical Field

[0001] This invention relates to new energy oil-cooled motor gearbox oil and its preparation and application. Background Technology

[0002] In addition to the lubrication, cooling, and power transmission functions of traditional automatic transmission fluids, electric vehicle gearbox oils also need to possess the following properties: gear and bearing protection performance under high-speed motors, electrochemical performance, copper corrosion resistance, and material compatibility. The additive composition is the core of the gearbox oil. Patent CN113930273A discloses a lubricating oil composition for DHT (Digital High-Speed) transmissions and its application, employing functional additives such as metal deactivators, dispersants, friction modifiers, antioxidants, anti-wear agents, and ionic liquids. Patent CN108218835A discloses the preparation of an extreme pressure anti-wear agent and its application in transmission oils for new energy electric vehicles, using 2-pyrrole dithioacetamidoamine, detergents, ashless dispersants, and hydrogenated base oils for blending. Summary of the Invention

[0003] This invention is made to further improve the anti-wear properties of existing new energy oil-cooled motor gearbox oil and enhance its compatibility with motor materials.

[0004] In a first aspect, the present invention relates to a new energy oil-cooled motor gearbox oil, wherein the components and their contents, by mass percentage, of the new energy oil-cooled motor gearbox oil are as follows:

[0005] Viscosity index improver 4.5~7.0%; detergent 0.05~0.2%; dispersant 4.5~6.0%; extreme pressure anti-wear agent 0.5~1.5%; rust inhibitor 0.05~0.3%; antioxidant 0.1~1.0%; metal passivator 0.01~0.2%; antifoaming agent 0.01~0.03%; hydrotreated base oil 70~85%; ester oil 2~13%.

[0006] In one or more optional embodiments, the extreme pressure anti-wear agent is prepared by compounding ammonium phosphate salt with butyl triphenyl thiophosphate and ashless liquid dithiophosphate.

[0007] In one or more optional embodiments, the mass ratio of the ammonium phosphate salt to butyltriphenyl thiophosphate (e.g., Irgalube232) and ashless liquid dithiophosphate (e.g., POUPC3005) is 0.05~0.13:0.4~0.9:0.06~0.2, preferably 0.09~0.11:0.4~0.7:0.1~0.18.

[0008] In one or more optional embodiments, the ammonium phosphate salt has the following general molecular formula:

[0009] ;

[0010] Wherein, R is an alkyl group selected from C2 to C6, and R′ is an alkyl group selected from C8 to C6. 12 Alkyl groups, such as POUPC3004.

[0011] In one or more alternative embodiments, the viscosity index improver is polymethacrylate.

[0012] In one or more alternative embodiments, the detergent is a high-base-value alkylphenol salt.

[0013] In one or more optional embodiments, the dispersant is one or both of monosuccinimide, bissuccinimide, or boronized succinimide.

[0014] In one or more optional embodiments, the rust inhibitor is at least one of dodecenyl succinic acid or alkenyl succinic acid half ester.

[0015] In one or more optional embodiments, the antioxidant is at least one of octyl / pentyl diphenylamine or a high molecular weight phenolic antioxidant.

[0016] In one or more alternative embodiments, the metal passivating agent is a toluenetriazole derivative.

[0017] In one or more optional embodiments, the antifoaming agent is a composite antifoaming agent of silicone and non-silicone types.

[0018] In one or more optional embodiments, the hydrotreated base oil is one or more of Group II or Group III hydrotreated base oils.

[0019] In one or more alternative embodiments, the ester oil is an adipate ester.

[0020] Preferably, the present invention relates to a new energy oil-cooled motor gearbox oil, the components of which and their contents by mass percentage are as follows:

[0021] Viscosity index improver: polymethacrylate 5.5%; detergent: high-base-value sulfurized alkylphenol salt 0.15%; dispersant: monosuccinimide 5.1%; extreme pressure anti-wear agent: ammonium phosphate salt 0.11%, butyl triphenyl thiophosphate 0.6% and ashless liquid dithiophosphate 0.12%; rust inhibitor: alkenyl succinate half ester 0.1%; antioxidant: octyl / pentyl diphenylamine 0.37%; metal passivator: toluene-triazole derivative 0.04%; antifoaming agent: No. 2 composite antifoaming agent 0.03%; ester oil: adipate ester 5%; hydrotreated base oil: Group III hydrotreated base oil 82.88%.

[0022] Secondly, the present invention relates to a method for preparing the aforementioned new energy oil-cooled motor gearbox oil, the method comprising:

[0023] The viscosity index improver, detergent, dispersant, extreme pressure anti-wear agent, rust inhibitor, antioxidant, metal passivator, antifoaming agent, ester oil and hydrogenated base oil are mixed.

[0024] Thirdly, the present invention relates to the application of the aforementioned new energy oil-cooled motor gearbox oil in the lubrication of new energy oil-cooled motor gearboxes.

[0025] Based on the above technical solution, the beneficial effects of the present invention compared with the prior art are as follows:

[0026] This invention employs a sulfur-free extreme pressure anti-wear agent, ammonium phosphate salt, compounded with ashless liquid dithiophosphate and butyltriphenyl thiophosphate, exhibiting excellent anti-wear properties. The use of low-polarity ammonium phosphate salt as the anti-wear agent effectively improves the oil's corrosion resistance and electrochemical performance, and also provides certain compatibility with motor materials. The lubricating oil composition provided by this invention has stable performance and meets the lubrication requirements of the gearbox system in new energy oil-cooled motor structures. Detailed Implementation

[0027] The following provides a detailed description of the embodiments of the present invention: These embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and processes. However, the scope of protection of the present invention is not limited to the following embodiments. Process parameters not specified in the following embodiments are generally performed under conventional conditions.

[0028] The endpoints and any values ​​of the ranges disclosed in this invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this invention.

[0029] The following provides a detailed description of various specific embodiments of a new energy oil-cooled motor gearbox oil, its preparation, and its application, as provided in the embodiments of the present invention.

[0030] This invention proposes a new energy oil-cooled motor gearbox oil, wherein the components and their contents, by mass percentage, are as follows:

[0031] Viscosity index improver 4.5~7.0%; detergent 0.05~0.2%; dispersant 4.5~6.0%; extreme pressure anti-wear agent 0.5~1.5%; rust inhibitor 0.05~0.3%; antioxidant 0.1~1.0%; metal passivator 0.01~0.2%; antifoaming agent 0.01~0.03%; hydrotreated base oil 70~85%; ester oil 2~13%.

[0032] The extreme pressure anti-wear agent of the present invention is a compound of ammonium phosphate salt, butyl triphenyl thiophosphate, and ashless liquid dithiophosphate, which can improve the anti-wear properties of oil.

[0033] In one or more alternative embodiments, the mass ratio of ammonium phosphate salt to butyltriphenyl thiophosphate (e.g., Irgalube 232) and ashless liquid dithiophosphate (e.g., POUPC 3005) is 0.05~0.13:0.4~0.9:0.06~0.2, preferably 0.09~0.11:0.4~0.7:0.1~0.18.

[0034] The ammonium phosphate salt described in this invention has the following general molecular formula:

[0035] ;

[0036] Wherein, R is an alkyl group selected from C2 to C6, and R′ is an alkyl group selected from C8 to C6. 12 Alkyl groups, such as POUPC3004.

[0037] The viscosity index improver described in this invention is polymethacrylate.

[0038] The detergent described in this invention is a high-alkalinity alkylphenol salt with sulfurized base. The high-alkalinity alkylphenol salt with sulfurized base has good neutralization ability, as well as good antioxidant and anti-corrosion properties.

[0039] The dispersant and detergent described in this invention work synergistically to improve the dispersibility of oil sludge. The dispersant is one or two of monosuccinimide, bissuccinimide, or boronized succinimide.

[0040] The rust inhibitor described in this invention is at least one of dodecenyl succinic acid or alkenyl succinic acid half ester, which reduces rust by forming an adsorption film on the metal surface, inhibiting the contact between the metal and water and oxygen.

[0041] The antioxidant described in this invention is at least one of octyl / pentyl diphenylamine or high molecular weight phenolic antioxidants, which is used to improve the antioxidant properties of oil products, thereby extending the oil product's lifespan.

[0042] The metal passivating agent described in this invention is a toluene-triazole derivative. The toluene-triazole derivative, in combination with the extreme pressure anti-wear agent, can form a chemical protective film on the metal surface, preventing it from becoming an ion-catalyzed oxidizing oil, and at the same time preventing corrosion of the metal by sulfur and organic acids.

[0043] The antifoaming agent described in this invention is a composite antifoaming agent consisting of both silicone and non-silicone types.

[0044] The hydrotreated base oil described in this invention is one or more of Group II or Group III hydrotreated base oils, and the ester oil is adipate ester, which has a suitable viscosity and will not affect the flash point and other physicochemical properties of the oil.

[0045] Preferably, the present invention relates to a new energy oil-cooled motor gearbox oil, the components of which and their contents by mass percentage are as follows:

[0046] Viscosity index improver: polymethacrylate 5.5%; detergent: high-base-value sulfurized alkylphenol salt 0.15%; dispersant: monosuccinimide 5.1%; extreme pressure anti-wear agent: ammonium phosphate salt 0.11%, butyl triphenyl thiophosphate 0.6% and ashless liquid dithiophosphate 0.12%; rust inhibitor: alkenyl succinate half ester 0.1%; antioxidant: octyl / pentyl diphenylamine 0.37%; metal passivator: toluene-triazole derivative 0.04%; antifoaming agent: No. 2 composite antifoaming agent 0.03%; ester oil: adipate ester 5%; hydrotreated base oil: Group III hydrotreated base oil 82.88%.

[0047] Based on the same inventive concept, this invention also provides a method for preparing the above-mentioned new energy oil-cooled motor gearbox oil, the method comprising:

[0048] The viscosity index improver, detergent, dispersant, extreme pressure anti-wear agent, rust inhibitor, antioxidant, metal passivator, antifoaming agent, ester oil and hydrogenated base oil are mixed.

[0049] Based on the same inventive concept, this embodiment of the invention also provides an application of the above-mentioned new energy oil-cooled motor gearbox oil in the lubrication of new energy oil-cooled motor gearboxes.

[0050] The lubricating oil composition for new energy oil-cooled motor gearbox oil provided by the present invention and its application are described in detail below with reference to embodiments:

[0051] Example 1

[0052] A new energy oil-cooled motor gearbox oil is prepared by mixing polymethacrylate, high-base-value sulfurized alkylphenol salt, monosuccinimide, alkenyl succinate half ester, octyl / pentyl diphenylamine, butyl triphenyl thiophosphate Irgalube232, ashless liquid dithiophosphate POUPC3005, ammonium phosphate salt POUPC3004, toluenetriazole derivative, No. 2 composite antifoaming agent, adipate ester and Group III hydrogenated base oil.

[0053] The components and their contents of the new energy oil-cooled motor gearbox oil in this embodiment, expressed as a percentage by mass, are shown in Table 1 below.

[0054] Table 1. Components and Contents of Lubricating Oil Composition

[0055]

[0056] Example 2

[0057] A new energy oil-cooled motor gearbox oil is prepared by mixing polymethyl methacrylate, high-base-value sulfurized alkylphenol salt, monosuccinimide, bissuccinimide, alkenyl succinate half ester, octyl / pentyl diphenylamine, butyl triphenyl thiophosphate Irgalube232, ashless liquid dithiophosphate POUPC3005, ammonium phosphate salt POUPC3004, toluenetriazole derivative, No. 2 composite antifoaming agent, adipate ester and Group III hydrogenated base oil.

[0058] The components and their contents of the new energy oil-cooled motor gearbox oil in this embodiment, expressed as a percentage by mass, are shown in Table 2 below.

[0059] Table 2. Components and Contents of Lubricating Oil Composition

[0060]

[0061]

[0062] Example 3

[0063] The oil for the gearbox of a new energy oil-cooled motor is prepared by mixing polymethacrylate, high-base-value sulfurized alkylphenol salt, bis(succinimide), dodecenylsuccinic acid, octyl / pentyl diphenylamine, high molecular weight phenolic antioxidant, butyl triphenyl thiophosphate Irgalube232, ashless liquid dithiophosphate POUPC3005, ammonium phosphate salt POUPC3004, toluenetriazole derivative, No. 2 composite antifoaming agent, adipate ester and Group III hydrogenated base oil.

[0064] The components and their contents of the new energy oil-cooled motor gearbox oil in this embodiment, expressed as a percentage by mass, are shown in Table 3 below.

[0065] Table 3. Components and content of lubricating oil composition

[0066]

[0067]

[0068] Example 4

[0069] The oil for the gearbox of a new energy oil-cooled motor is prepared by mixing polymethyl methacrylate, high-base-value sulfurized alkylphenol salt, monosuccinimide, dodecenylsuccinic acid, high molecular weight phenolic antioxidant, butyltriphenyl thiophosphate Irgalube232, ashless liquid dithiophosphate POUPC3005, ammonium phosphate salt POUPC3004, toluenetriazole derivative, No. 2 composite antifoaming agent, adipate ester and Group III hydrogenated base oil.

[0070] The components and their contents of the new energy oil-cooled motor gearbox oil in this embodiment, expressed as a percentage by mass, are shown in Table 4 below.

[0071] Table 4. Components and Contents of Lubricating Oil Composition

[0072]

[0073]

[0074] Test Example 1

[0075] The lubricating oil compositions blended in Examples 1-4 were subjected to product performance tests. The test items and test results are shown in Table 5 below.

[0076] Table 5 Product Performance Tests of Lubricating Oil Compositions

[0077]

[0078]

[0079]

[0080] As shown in Table 5, the performance of the new energy oil-cooled motor gearbox oils prepared in Examples 1-3 all meet industry standards and can satisfy the lubrication requirements of the electric vehicle gearbox system under the oil-cooled motor structure. Among them, the oil blended in Example 1, which combines ammonium phosphate salt with butyl triphenyl thiophosphate and ashless liquid dithiophosphate at a mass ratio of 0.11:0.6:0.12, exhibits excellent anti-wear performance, achieving an FZG failure rating of 8. It also demonstrates outstanding copper corrosion resistance and oxidation resistance. After oxidation at 170℃ for 192 hours, the kinematic viscosity change rate at 100℃ is 2.1%, and the acid value change is 0.43. After oxidation at 150℃ for 168 hours, the copper strip corrosion rating is 2C. The copper content in Example 1 is only 80 ppm, while exhibiting good electrochemical properties and compatibility with sealing materials. Example 2 has a high content of ashless liquid dithiophosphate, resulting in excellent anti-wear properties, but poor copper corrosion resistance. Example 3 has a similar ratio of butyltriphenyl thiophosphate, ashless liquid dithiophosphate, and ammonium phosphate salt to that of Example 1. Although its copper corrosion resistance is comparable to Example 1, its anti-wear resistance is also inferior due to lower anti-wear agent dosages. The anti-wear and copper corrosion resistance of the new energy oil-cooled motor gearbox oil prepared in Example 4 are worse than those in Examples 1-3. Therefore, the best overall performance of the lubricating oil composition is achieved when ammonium phosphate salt, butyltriphenyl thiophosphate, and ashless liquid dithiophosphate are blended at a mass ratio of 0.09-0.11:0.4-0.7:0.1-0.18.

[0081] Although specific embodiments of the invention have been described in detail, those skilled in the art will understand that various modifications and substitutions can be made to those details based on all the teachings disclosed, and all such changes are within the scope of protection of this invention. The full scope of this invention is given by the appended claims and any equivalents thereof.

Claims

1. A new energy oil-cooled motor gearbox oil, characterized in that, The oil composition and content of the new energy oil-cooled motor gearbox, expressed as a percentage by mass, are as follows: Viscosity index improver: 4.5%~7.0%; Detergent 0.05~0.2%; Dispersant 4.5~6.0%; Extreme pressure anti-wear agent 0.5~1.5%; Rust inhibitor 0.05~0.3%; Antioxidant 0.1~1.0%; Metal passivating agent 0.01~0.2%; Antifoaming agent 0.01~0.03%; Ester oils 2-13%; Hydrogenated base oil 70-85%; The sum of the mass percentages of all the above components is 100%; The extreme pressure anti-wear agent is prepared by compounding ammonium phosphate salt with butyl triphenyl thiophosphate and ashless liquid dithiophosphate. The mass ratio of the ammonium phosphate salt to butyltriphenyl thiophosphate and ashless liquid dithiophosphate is 0.09~0.11:0.4~0.7:0.1~0.

18. The ammonium phosphate salt is ammonium phosphate salt POUPC3004; The hydrotreated base oil is one or more of Group II or Group III hydrotreated base oils; The ester oil is adipate.

2. The new energy oil-cooled motor gearbox oil as described in claim 1, characterized in that, The viscosity index improver is polymethyl methacrylate.

3. The new energy oil-cooled motor gearbox oil as described in claim 1, characterized in that, The detergent is a high-alkalinity sulfide alkylphenol salt.

4. The new energy oil-cooled motor gearbox oil as described in claim 1, characterized in that, The dispersant is one or two of monosuccinimide, bissuccinimide, or boronized succinimide.

5. The new energy oil-cooled motor gearbox oil as described in claim 1, characterized in that, The rust inhibitor is at least one of dodecenyl succinic acid or alkenyl succinic acid half ester.

6. The new energy oil-cooled motor gearbox oil as described in claim 1, characterized in that, The antioxidant is at least one of octyl / pentyl diphenylamine or high molecular weight phenolic antioxidants.

7. The new energy oil-cooled motor gearbox oil as described in claim 1, characterized in that, The metal passivating agent is a toluenetriazole derivative.

8. The new energy oil-cooled motor gearbox oil as described in claim 1, characterized in that, The antifoaming agent is a No. 2 composite antifoaming agent.

9. The new energy oil-cooled motor gearbox oil as described in claim 1, characterized in that, The composition and content of the oil in the new energy oil-cooled motor gearbox, by mass percentage, are as follows: Viscosity index improver: 5.5% polymethyl methacrylate; Detergent: 0.15% high-alkalinity alkylphenol salt; Dispersant: Monosuccinimide 5.1%; Extreme pressure anti-wear agent: 0.11% ammonium phosphate salt, 0.6% butyl triphenyl thiophosphate, and 0.12% ashless liquid dithiophosphate; Rust inhibitor: Alkenyl succinate half ester 0.1%; Antioxidant: Octyl / pentyl diphenylamine 0.37%; Metal passivating agent: 0.04% toluene-triazole derivative; Antifoaming agent: 0.03% of compound antifoaming agent No. 2; Ester oils: adipate esters 5%; Hydrogenated base oils: Group III hydrogenated base oils 82.88%.

10. A method for preparing the new energy oil-cooled motor gearbox oil according to any one of claims 1 to 9, characterized in that, The method includes: The viscosity index improver, detergent, dispersant, extreme pressure anti-wear agent, rust inhibitor, antioxidant, metal passivator, antifoaming agent, ester oil and hydrogenated base oil are mixed.

11. The application of the new energy oil-cooled motor gearbox oil according to any one of claims 1 to 9 in the lubrication of the new energy oil-cooled motor gearbox.

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