Additive composition and lubricating oil composition for improving metal protection capability and oxidation resistance of special hybrid transmission oil

Abstract

The invention provides an additive composition and a lubricating oil composition for improving metal protection capability and oxidation resistance of special hybrid transmission oil. The additive composition comprises the following components in parts by weight: 2.0 to 3.5 parts of a viscosity index improver, 0.05 to 0.1 part of a clearing agent, 4.5 to 7.5 parts of a dispersing agent, 0.3 to 1.0 part of an anti-wear reagent at extreme pressure, 0.05 to 0.3 part of an anti-rust agent, 0.1 to 1.0 part of a phenolic antioxidant, 0.01 to 0.2 part of a metal deactivator and 0.01 to 0.03 part of an anti-foaming agent, wherein the antirust agent is N, N-bis (benzotriazole methylene) oleylamine, and the phenolic antioxidant is of a structure shown in the invention. The composition provided by the invention has excellent solubility, can improve the passivated metal activity and anti-rust performance of a lubricating oil additive, and improves the protection capability of lubricating oil on metal. The composition provided by the invention is stable in performance and meets the lubrication requirement of a special hybrid gearbox system.

Description

Technical Field

[0001] The invention relates to an additive composition and a lubricating oil composition for improving the metal protection ability and anti-oxidation ability of a special hybrid transmission oil, belonging to the technical field of lubricating oils. Background Art

[0002] Dedicated hybrid transmissions are generally composed of generators, drive motors, power coupling devices, and shifting devices, and have the advantages of compact structure, diverse modes, and excellent comprehensive performance. When the vehicle is traveling at a low speed or just starting, the vehicle requires less power. At this time, the drive motor uses the power of the high-voltage battery to directly drive the vehicle, which is the pure electric mode; as the vehicle speed increases or under full throttle acceleration conditions, the power of the power battery is not enough to drive the vehicle. At this time, the internal combustion engine starts and the planetary gearbox is used to achieve power diversion. The DHT architecture achieves fuel saving by reasonably allocating the power output of the engine and the motor to achieve smooth driving of the vehicle under various conditions.

[0003] Since the transmission oil is in direct contact with the hybrid system, electrical properties, thermal conductivity, material compatibility, bearing protection and copper corrosion protection performance need to be considered. Among them, reliable copper corrosion protection can solve the corrosion protection of controllers, sensors, circuits, motors and mechanical parts. Due to direct contact with the motor, the oil will inevitably come into contact with various copper-containing electrical components inside the motor. At the same time, the electric drive system is also developing towards an 800V high-voltage platform, and high voltage may cause stray currents in structures such as motors and transmissions, exacerbating the corrosion of copper parts. Therefore, the oil needs to have better copper corrosion protection.

[0004] CN113930273A discloses a lubricating oil composition for a DHT structure gearbox and its application, which adopts functional additives such as metal deactivator, dispersant, friction modifier, antioxidant, anti-wear agent, ionic liquid, etc. The oil has good anti-wear and anti-oxidation properties, excellent electrochemical properties, clutch friction performance and motor compatibility.

[0005] CN106967485A discloses a composition for hybrid vehicle transmission oil and a preparation method thereof, as well as a transmission oil containing the composition and a preparation method thereof. Functional additives such as detergents, antioxidants, metal deactivators, anti-wear agents, and ionic liquids are used, and the oil has good extreme pressure anti-wear properties, oxidation stability, clean dispersibility, and rust prevention properties, and has good wire sheath material compatibility and insulation properties, and has passed the reducer monomer experimental level hybrid vehicle test.

[0006] CN116041193A discloses a novel alkyl glycerolamine gemini surfactant and its preparation method and application. The synthesis process is simple and the product is used as a novel alkyl glycerolamine gemini surfactant with antibacterial effect.

[0007] However, there is still much room for improvement in the metal protection and antioxidant capabilities of current hybrid transmission oils. Summary of the invention

[0008] In order to solve the above technical problems, the object of the present invention is to provide an additive composition for a dedicated hybrid transmission oil, which can improve the metal protection ability and antioxidant ability of the dedicated hybrid transmission oil.

[0009] In order to achieve the above object, the present invention provides an additive composition for improving the metal protection ability and antioxidant ability of a special hybrid transmission oil, wherein the additive composition comprises, in parts by mass:

[0010] 2.0-3.5 parts of viscosity index improver, 0.05-0.1 parts of detergent, 4.5-7.5 parts of dispersant, 0.3-1.0 parts of extreme pressure anti-wear agent, 0.05-0.3 parts of rust inhibitor, 0.1-1.0 parts of phenolic antioxidant, 0.01-0.2 parts of metal passivator, 0.01-0.03 parts of anti-foaming agent;

[0011] Wherein, the rust inhibitor is N,N-bis(benzotriazole methylene) oleylamine;

[0012] The structure of the phenolic antioxidant is shown below:

[0013]

[0014] The rust inhibitor of the invention adopts oleylamine, benzotriazole and formaldehyde to undergo reflux reaction in xylene to prepare N,N-bis(benzotriazole methylene)oleylamine. Compared with the existing N,N-bis(benzotriazole methylene) laurylamine, the oleylamine group in the N,N-bis(benzotriazole methylene)oleylamine has better oil solubility and excellent solubility, can improve the metal passivation activity and rust prevention performance of the lubricating oil additive, and improve the protection ability of the lubricating oil for metals.

[0015] In the above additive composition, the phenolic antioxidant used is a phenolic antioxidant of the structure shown in the present invention. In addition to having excellent antioxidant properties, the phenolic antioxidant can also effectively complex metal ions, has a metal passivation effect, greatly reduces the generation of oil sludge, and the antioxidant has low volatility, further reducing the volatilization of the antioxidant at high temperature.

[0016] In the above-mentioned additive composition, preferably, the additive composition comprises, by mass, 2.2-3.0 parts of viscosity index improver, 0.05-0.09 parts of detergent, 4.5-7.0 parts of dispersant, 0.3-0.85 parts of extreme pressure anti-wear agent, 0.05-0.2 parts of rust inhibitor, 0.3-0.85 parts of phenolic antioxidant, 0.02-0.15 parts of metal passivator, and 0.01-0.03 parts of anti-foaming agent.

[0017] In the above additive composition, preferably, the viscosity index improver is polymethacrylate; more preferably, the polymethacrylate includes one or a combination of two or more of Viscoplex 12-075, Viscoplex 12-095, ACLUBE V-1060.

[0018] In the above additive composition, preferably, the detergent is one or a combination of two or more of high-based sulfonates, high-based sulfurized alkylphenol salts, high-based salicylates, and thiosulfates.

[0019] In the above additive composition, preferably, the high base sulfonate includes one or a combination of two of HiTEC611 and RHY106;

[0020] The high base sulfurized alkyl phenol salt comprises one or a combination of 115B and LZ6499;

[0021] The high base salicylate includes one or a combination of two of RHY109B and 112;

[0022] In the above additive composition, preferably, the dispersant is bissuccinimide.

[0023] In the above additive composition, preferably, the extreme pressure anti-wear agent is a mixture of dialkyl dithiophosphate and butyl triphenyl thiophosphate, and the mass ratio of the two is 0.25-0.85:0.05-0.15.

[0024] In the above additive composition, preferably, the metal passivator is a toluenetriazole derivative, which can form a chemical protective film on the metal surface to prevent it from becoming ions, catalyzing the oxidation of oil products, and preventing corrosion by sulfur and organic acids, etc. More preferably, the toluenetriazole derivative includes one or a combination of liquid toluenetriazole derivatives and liquid water-soluble toluenetriazole derivatives.

[0025] In the above additive composition, preferably, the anti-foaming agent is a silicon-non-silicon compound T922.

[0026] The present invention also provides a lubricating oil composition, which comprises the above-mentioned additive composition for improving the metal protection ability and anti-oxidation ability of the special hybrid transmission oil.

[0027] In the above lubricating oil composition, preferably, the lubricating oil composition comprises, by parts by mass:

[0028] Viscosity index improver 2.0-3.5 parts, detergent 0.05-0.1 parts, dispersant 4.5-7.5 parts, extreme pressure anti-wear agent 0.3-1.0 parts, rust inhibitor 0.05-0.3 parts, phenolic antioxidant 0.1-1.0 parts, metal passivator 0.01-0.2 parts, anti-foaming agent 0.01-0.03 parts, hydrogenated base oil and / or ester oil are supplemented to 100 parts.

[0029] In the above lubricating oil composition, the hydrogenated base oil and ester oil used have a more suitable viscosity and do not affect the physical and chemical indicators such as the flash point of the oil.

[0030] In the above lubricating oil composition, preferably, the hydrogenated base oil is one or more of Group II hydrogenated base oil and / or Group III hydrogenated base oil.

[0031] In the above lubricating oil composition, preferably, the ester oil is a dibasic acid diester and / or a diol diester.

[0032] In the above lubricating oil composition, preferably, the dibasic acid diester includes one or a combination of adipic acid and sebacic acid; the diol diester includes one or a combination of diisooctyl adipate and diisooctyl sebacic acid.

[0033] The additive composition and lubricating oil composition provided by the present invention can be prepared by sequentially adding a viscosity index agent, a detergent, a dispersant, an extreme pressure anti-wear agent, a rust inhibitor, an antioxidant, a metal passivator and a base oil into a blending kettle, heating to 65±5°C, then adding an anti-foaming agent, and circulating and stirring the whole amount at this temperature for 3 hours to obtain the additive composition. The additive composition is mixed with other components of the lubricating oil composition and stirred evenly to obtain the lubricating oil composition.

[0034] The additive composition and lubricating oil composition for improving the metal protection and anti-oxidation ability of the special hybrid transmission oil provided by the present invention have excellent solubility, can improve the passivation metal activity and anti-rust performance of the lubricating oil additive, and improve the metal protection ability of the lubricating oil. The composition provided by the present invention has stable performance and meets the lubrication requirements of the special hybrid transmission system. DETAILED DESCRIPTION

[0035] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention is now described in detail below, but it should not be construed as limiting the applicable scope of the present invention.

[0036] The preparation process of N,N-bis(benzotriazole methylene) oleylamine used in the embodiment is as follows:

[0037]

[0038] The structural formula of the phenolic antioxidant used in the embodiment is as follows:

[0039]

[0040] Comparative Example 1

[0041] This comparative example provides a lubricating oil composition, the composition of which is shown in Table 1:

[0042] Table 1

[0043]

[0044]

[0045] Example 1

[0046] This embodiment provides a lubricating oil composition, the composition of which is shown in Table 2:

[0047] Table 2

[0048] name Amount (mass percentage) Polymethacrylate Viscoplex 12-075 2.5 High base sulfurized alkyl phenol 115B 0.07 Bisuccinimide 5.38 Butyl triphenyl phosphorothioate 0.4 Dialkyl dithiophosphate Irgalube353 0.07 N,N-Bis(benzotriazole methylene)oleylamine 0.2 Phenolic antioxidants 0.6 Toluene triazole derivative Irgalube39 0.1 Composite antifoaming agent T922 0.03 Adipic acid esters 5 Group III Hydrogenated Base Oil margin

[0049] Example 2

[0050] This embodiment provides a lubricating oil composition, the composition of which is shown in Table 3:

[0051] Table 3

[0052]

[0053]

[0054] Comparative Example 2

[0055] This comparative example provides a lubricating oil composition, the composition of which is shown in Table 4:

[0056] Table 4

[0057] name Amount (mass percentage) Polymethacrylate Viscoplex 12-075 2.5 High base sulfurized alkyl phenol 115B 0.05 Bisuccinimide 5.38 Butyl triphenyl phosphorothioate 0.4 Dialkyl dithiophosphate Irgalube353 0.1 N,N-Bis(benzotriazole methylene)oleylamine 0.35 High molecular weight phenol L135 0.6 Toluene triazole derivative Irgalube39 0.1 Composite antifoaming agent T922 0.03 Adipic acid esters 5 Group III Hydrogenated Base Oil margin

[0058] Example 3

[0059] This embodiment provides a lubricating oil composition, the composition of which is shown in Table 5:

[0060] Table 5

[0061]

[0062]

[0063] Comparative Example 3

[0064] This comparative example provides a lubricating oil composition, the composition of which is shown in Table 6:

[0065] Table 6

[0066] name Amount (mass percentage) Polymethacrylate Viscoplex 12-075 2.5 High base sulfurized alkyl phenol 115B 0.07 Bisuccinimide 5.38 Butyl triphenyl phosphorothioate 0.4 Dialkyl dithiophosphate Irgalube353 0.07 N,N-Bis(benzotriazolemethylene)laurylamine 0.2 High molecular weight phenol L135 0.6 Toluene triazole derivative Irgalube39 0.1 Composite antifoaming agent T922 0.03 Adipic acid esters 5 Group III Hydrogenated Base Oil margin

[0067] The oil products blended with the lubricating oil compositions of Examples 1-3 and Comparative Examples 1-3 were tested, and the test results are shown in Table 7:

[0068] Table 7

[0069]

[0070]

[0071] From the oil product data prepared using the lubricating oil compositions of Examples 1-3 and Comparative Examples 1-3 shown in Table 7, it can be seen that:

[0072] The special hybrid transmission oils prepared in Example 1 and Example 2 can meet the requirements of industry standards in all properties, have excellent anti-wear performance, and the FZG failure level reaches 8. They all show excellent copper corrosion performance and anti-rust performance. After 150°C and 168h, the copper sheet corrosion rating is 1b and the Cu content in the oil is only 93ppm and 68ppm. After DKA is oxidized at 170°C and 192h, the change rates of kinematic viscosity at 100°C are 6.03% and 53.91% respectively, and the acid value changes are 0.43 (KOH) / (mg / g) and 0.47 (KOH) / (mg / g) respectively.

[0073] In the oil product prepared in Comparative Example 1, the content of N, N-bis (benzotriazole methylene) oleylamine is 0.03%, and the copper corrosion and anti-rust performance cannot meet the requirements of the industry standard. In the oil product prepared in Comparative Example 2, when the content of N, N-bis (benzotriazole methylene) oleylamine exceeds a certain dose, although the copper corrosion performance remains good, the excessive dose of oleylamine increases the polarity of the oil product, aggravates the oxidation of the oil product, and makes the 100°C kinematic viscosity change rate of the oil product after DKA oxidation significantly increase. The oxidation performance can only be improved by using the phenolic antioxidant of the present invention as shown in Example 3, but there is still a difference compared with Example 1 and Example 2. In the oil product prepared in Comparative Example 3, N, N-bis (benzotriazole methylene) laurylamine is used as the rust inhibitor of the oil product, and the traditional phenolic antioxidant L135 is used. From the results, it can be seen that the copper corrosion and anti-oxidation performance are poor.

[0074] It can be seen that the N,N-bis(benzotriazole methylene) oleylamine prepared by the reflux reaction of oleylamine, benzotriazole and formaldehyde in xylene, with a dosage of 0.05%-0.3% and the phenolic antioxidant with the structure shown in the present invention, with a dosage of 0.1%-1.0%, can improve the metal passivation activity, rust prevention performance and antioxidant performance of the lubricating oil additive, and overall improve the protection ability of the lubricating oil for metals.

Claims

1. An additive composition for improving the metal protection and antioxidant capabilities of a special hybrid transmission oil, wherein: In parts by mass, the additive composition comprises: 2.0-3.5 parts of viscosity index improver, 0.05-0.1 parts of detergent, 4.5-7.5 parts of dispersant, 0.3-1.0 parts of extreme pressure anti-wear agent, 0.05-0.3 parts of rust inhibitor, 0.1-1.0 parts of phenolic antioxidant, 0.01-0.2 parts of metal passivator, 0.01-0.03 parts of anti-foaming agent; Wherein, the rust inhibitor is N,N-bis(benzotriazole methylene) oleylamine; The structure of the phenolic antioxidant is shown below:

2. The additive composition according to claim 1, wherein The viscosity index improver is polymethacrylate; preferably, the polymethacrylate includes one or a combination of two or more of Viscoplex 12-075, Viscoplex 12-095, and ACLUBE V-1060.

3. The additive composition according to claim 1, wherein The detergent is one or a combination of two or more of high-alkalinity sulfonates, high-alkalinity sulfurized alkylphenol salts and high-alkalinity salicylates.

4. The additive composition according to claim 1, wherein The dispersant is bis-succinimide.

5. The additive composition according to claim 1, wherein The extreme pressure anti-wear agent is a mixture of dialkyl dithiophosphate and butyl triphenyl thiophosphate, and the mass ratio of the two is 0.25-0.85:0.05-0.

15.

6. The additive composition according to claim 1, wherein The metal deactivator is a toluenetriazole derivative; preferably, the toluenetriazole derivative includes one or a combination of a liquid toluenetriazole derivative and a liquid water-soluble toluenetriazole derivative.

7. The additive composition according to claim 1, wherein The antifoaming agent is a silicon-non-silicon compound T922.

8. A lubricating oil composition comprising the additive composition for improving the metal protection ability and antioxidant ability of a dedicated hybrid transmission oil according to any one of claims 1 to 7.

9. The lubricating oil composition according to claim 8, wherein The lubricating oil composition comprises, by parts by mass: Viscosity index improver 2.0-3.5 parts, detergent 0.05-0.1 parts, dispersant 4.5-7.5 parts, extreme pressure anti-wear agent 0.3-1.0 parts, rust inhibitor 0.05-0.3 parts, phenolic antioxidant 0.1-1.0 parts, metal passivator 0.01-0.2 parts, anti-foaming agent 0.01-0.03 parts, hydrogenated base oil and / or ester oil are supplemented to 100 parts.

10. The lubricating oil composition according to claim 9, wherein The hydrogenated base oil is one or more of a Class II hydrogenated base oil and / or a Class III hydrogenated base oil; The ester oil is a diester of a dibasic acid and / or a diester of a diol.

11. The lubricating oil composition according to claim 10, wherein The diester of the dibasic acid includes one or a combination of adipic acid and sebacic acid; the diester of the diol includes one or a combination of diisooctyl adipate and diisooctyl sebacic acid.

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