Additive composition for improving metal protection capability of reduction gearbox oil of water-cooled motor and preparation method of additive composition

Abstract

The invention discloses an additive composition for improving the metal protection capability of reduction gearbox oil of a water-cooled motor. The additive composition comprises the following components in percentage by mass: 1.5-3.0% of a clearing agent, 50-80% of a boronizing dispersant, 3.5-5.0% of an anti-wear reagent at extreme pressure, 1.0-2.0% of an anti-rust agent, 5.0-6.0% of an antioxidant, 0.1-0.6% of a metal deactivator and the balance of base oil A, the sum of the mass percentages of the components is 100%. The invention also discloses a preparation method of the additive composition, which specifically comprises the following steps: sequentially adding the detergent, the boronizing dispersant, the anti-wear reagent at extreme pressure, the antirust agent, the antioxidant, the metal deactivator and the base oil into a blending kettle, heating and stirring. After the composition provided by the invention is blended with base oil, the passivated metal activity and anti-rust performance of the lubricating oil additive can be improved, and the phenolic antioxidant in the composition can be effectively complexed with metal ions besides excellent oxidation resistance, so that the generation of oil sludge is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of lubricating oil additive compositions, and in particular relates to an additive composition for improving the metal protection capability of water-cooled motor reducer oil, and also relates to a preparation method of the additive composition. Background Art

[0002] The transmission system of pure electric vehicles is divided into water-cooled motor reducer system and oil-cooled motor reducer system according to the different motor cooling methods. It mainly includes water-cooled motor + single-stage reducer, oil-cooled motor + single-stage reducer and oil-cooled motor + multi-stage reducer. The most widely used one is water-cooled motor + single-stage reducer. Water-cooled motors require oils with good gear and bearing protection performance, as well as excellent low-temperature fluidity and shear stability. More and more car companies hope to use one oil to meet the needs of water-cooled motors and oil-cooled motors. With the development of high-speed motors, higher requirements are also placed on the copper corrosion performance of oils.

[0003] Chinese patent (application number: 201710208905.1, publication number: CN106929129A) discloses a composition for pure electric vehicle transmission oil and its preparation method, using functional additives such as viscosity index improver, detergent dispersant, antioxidant, corrosion inhibitor, anti-wear agent, friction modifier, anti-aging agent, anti-foaming agent, etc., the oil has good oxidation stability, anti-foaming, anti-wear and corrosion resistance. Chinese patent (application number: 201711446516.9, publication number: CN108218835A) discloses the preparation of an extreme pressure anti-wear agent and its application in new energy electric vehicle transmission oil, using 2-pyrrole dithioacetylamino, detergent, ashless dispersant and hydrogenated base oil, the product has low viscosity, low friction, low oil loss, and much lower corrosion to metals than similar products on the market. A Chinese patent (application number: 202211561215.1, publication number: CN116041193A) discloses a novel alkyl glycerolamine gemini surfactant and its preparation method and application. The synthesis process is simple and it is used as a novel alkyl glycerolamine gemini surfactant with antibacterial effect. A Chinese patent (application number: 201310093365.9, publication number: CN104059715B) discloses an antioxidant composition, a lubricating oil composition containing the antioxidant composition, and a method for improving the antioxidant performance of the lubricating oil. The antioxidant composition includes alkylphenyl naphthylamine, phenothiazine and sulfurized hindered phenol. The antioxidant composition and the lubricating oil composition are low in sulfur, low in ash, phosphorus-free, and have good thermal stability. They can significantly improve the oxidation stability of the lubricating oil under high temperature conditions and metal ion catalysis conditions, effectively extend the service life of the lubricating oil, and effectively control the generation trend of deposits under high temperature conditions, meeting the requirements for the preparation of high-grade lubricating oils. Summary of the invention

[0004] The purpose of the present invention is to provide an additive composition for improving the metal protection ability of water-cooled motor reduction box oil, thereby improving the passivation metal activity and anti-rust performance of the lubricating oil additive.

[0005] The technical scheme adopted by the present invention is that the additive composition for improving the metal protection ability of water-cooled motor reduction box oil includes the following components according to mass percentage: 1.5-3.0% of detergent, 50-80% of boronized dispersant, 3.5-5.0% of extreme pressure anti-wear agent, 1.0-2.0% of rust inhibitor, 5.0-6.0% of antioxidant, 0.1-0.6% of metal passivator, and the balance is base oil A; the sum of the mass percentages of the above components is 100%.

[0006] The present invention is also characterized in that:

[0007] The detergent is any one or two of high base sulfonate, high base phenate and thiosulfate.

[0008] The boronated dispersant is any one or two of monosuccinimide, polysuccinimide and boronated succinimide.

[0009] The extreme pressure anti-wear agent is any one or two of dibutyl lead dithiocarbamate, butyl triphenyl thiophosphate, and dialkyl dithiophosphate.

[0010] The metal deactivator is a toluenetriazole derivative.

[0011] Base oil A is a Group II base oil or a Group III base oil.

[0012] The rust inhibitor is N,N-bis(benzotriazole methylene) oleylamine.

[0013] The antioxidant is a phenolic antioxidant.

[0014] Another technical solution adopted by the present invention is a method for preparing an additive composition for improving the metal protection ability of water-cooled motor reducer oil, specifically: adding a detergent, a boronated dispersant, an extreme pressure anti-wear agent, a rust inhibitor, an antioxidant, a metal passivator and a base oil to a blending kettle in sequence, heating to 65±5°C, and then circulating and stirring the entire amount at this temperature for 3 hours to obtain the additive composition.

[0015] The beneficial effects of the present invention are as follows: after the composition of the present invention is blended with the base oil, the metal passivation activity and rust prevention performance of the lubricating oil additive can be improved, and the protection ability of the lubricating oil for metals can be improved; the phenolic antioxidant in the composition not only has excellent antioxidant performance, but can also effectively complex metal ions, has the effect of metal passivation, and greatly reduces the generation of sludge. DETAILED DESCRIPTION

[0016] The present invention is described in detail below in conjunction with specific implementation modes.

[0017] The additive composition for improving the metal protection ability of water-cooled motor reduction box oil of the present invention comprises the following components according to mass percentage: 1.5-3.0% of detergent, 50-80% of boronized dispersant, 3.5-5.0% of extreme pressure anti-wear agent, 1.0-2.0% of rust inhibitor, 5.0-6.0% of antioxidant, 0.1-0.6% of metal passivator, and the balance is base oil A; the sum of the mass percentages of the above components is 100%;

[0018] The detergent is any one or two of high base sulfonate, high base phenate, and thiosulfate;

[0019] The boronated dispersant is any one or two of monosuccinimide, polysuccinimide, and boronated succinimide;

[0020] The extreme pressure anti-wear agent is any one or two of dibutyl lead dithiocarbamate, butyl triphenyl thiophosphate, and dialkyl dithiophosphate;

[0021] Metal passivators are toluene triazole derivatives that can form a chemical protective film on the metal surface to prevent it from turning into ions and catalyzing the oxidation of oil products. At the same time, they can prevent corrosion from sulfur and organic acids.

[0022] Base oil A is a Class II base oil or a Class III base oil, has a more suitable viscosity, and does not affect the physical and chemical indicators such as the flash point of the oil.

[0023] The rust inhibitor is N,N-bis(benzotriazole methylene) oleylamine;

[0024] The preparation process of N,N-bis(benzotriazole methylene) oleylamine is as follows: oleylamine, benzotriazole, formaldehyde and xylene are mixed and refluxed (reaction time is 10 hours) to prepare N,N-bis(benzotriazole methylene) oleylamine. The reaction equation is as follows:

[0025]

[0026] Compared with the existing N,N-bis(benzotriazole methylene) lauryl amine, the oleylamine group in N,N-bis(benzotriazole methylene) oleylamine has better oil solubility and excellent solubility, which can improve the metal passivation activity and anti-rust performance of lubricating oil additives and improve the protection ability of lubricating oil to metals.

[0027] The antioxidant is a phenolic antioxidant with the following structural formula:

[0028]

[0029] The antioxidant of the present invention not only has excellent antioxidant performance, but also can effectively complex metal ions, has metal passivation effect, greatly reduces the generation of sludge, and has low volatility, further reducing the volatilization of the antioxidant at high temperature. The composition has stable performance and meets the lubrication requirements of the water-cooled motor reducer system.

[0030] The preparation method of the additive composition for improving the metal protection ability of water-cooled motor reducer oil of the present invention is: adding a detergent, a boronized dispersant, an extreme pressure anti-wear agent, a rust inhibitor, an antioxidant, a metal passivator and a base oil into a blending kettle in sequence, heating to 65±5°C, and then circulating and stirring the whole amount at this temperature for 3 hours to obtain a product, which is a brown oily liquid.

[0031] Example 1

[0032] The composition of the additive composition of this embodiment is shown in Table 1:

[0033] Table 1 Composition of additive composition

[0034]

[0035]

[0036] Example 2

[0037] The composition of the additive composition of this embodiment is shown in Table 2:

[0038] Table 2 Composition of additive composition

[0039] name Amount (mass percentage) Overbased Sulfonates 2.0 Monosuccinimide 70.1 Dibutyl lead dithiocarbamate 4.5 N,N-Bis(benzotriazole methylene)oleylamine 1.0 Phenolic antioxidants 4.5 Tolyltriazole derivatives 0.2 Group II base oil 17.7

[0040] Example 3

[0041] The composition of the additive composition of this embodiment is shown in Table 3:

[0042] Table 3 Composition of additive composition

[0043]

[0044]

[0045] Example 4

[0046] The composition of the additive composition of this embodiment is shown in Table 4:

[0047] Table 4 Composition of additive composition

[0048] name Amount (mass percentage) High base sulfurized alkyl phenol salt 3.0 Boronated Succinimide 67.5 Butyl triphenyl phosphorothioate 5.0 N,N-Bis(benzotriazole methylene)oleylamine 1.5 Phenolic antioxidants 6.0 Tolyltriazole derivatives 0.5 Group II base oil 16.5

[0049] Example 5

[0050] The composition of the additive composition of this embodiment is shown in Table 5:

[0051] Table 5 Composition of additive composition

[0052]

[0053]

[0054] Based on the total mass of the lubricating oil, the mass percentage of the lubricating oil additive is 6.55%, the mass percentage of the Group II base oil is 45%, the mass percentage of the Group III base oil is 42.95%, and the mass percentage of the viscosity index improver V12075 is 5.5%.

[0055] The test results of the oil products prepared by using Examples 1-5 are shown in Table 6:

[0056] Table 6 Test results of oil products

[0057]

[0058] It can be seen from the oil product data prepared in Examples 1-5 that although all data can meet the requirements of the industry standard, the current car companies hope to use one oil product to meet the needs of water-cooled motors and oil-cooled motors, and with the development of high-speed motors, higher requirements are also put forward for the copper corrosion and oxidation performance of the oil products. We hope to improve the copper corrosion and oxidation performance on the basis of the original oil products, and Examples 3 and 4 reflect the N, N-bis (benzotriazole methylene) oleylamine mentioned in the present invention when the dosage is 1.0% to 2.0%, and the phenolic antioxidant is 5.0% to 6.0%. The synergistic effect of the two can make the oil product 150°C, 168h copper corrosion maintain the copper sheet rating ≮1 level, and the Cu content in the oil is less than the 200ppm requirement of the pure electric vehicle reduction gearbox oil industry standard (oil-cooled motor), and the oxidation stability is relatively excellent. It can effectively improve the passivation metal activity and rust prevention performance of the lubricating oil additive, and improve the protection ability and antioxidant performance of the lubricating oil to metals.

Claims

1. An additive composition for improving the metal protection capability of water-cooled motor reduction gearbox oil, characterized in that: The following components are included in percentage by mass: 1.5-3.0% detergent, 50-80% boronized dispersant, 3.5-5.0% extreme pressure anti-wear agent, 1.0-2.0% rust inhibitor, 5.0-6.0% antioxidant, 0.1-0.6% metal passivator, and the balance is base oil A; the sum of the percentages by mass of the above components is 100%.

2. The additive composition for improving the metal protection ability of water-cooled motor reduction box oil according to claim 1, characterized in that: The detergent is any one or two of high base sulfonate, high base phenate and thiosulfate.

3. The additive composition for improving the metal protection ability of water-cooled motor reduction box oil according to claim 1, characterized in that: The boronated dispersant is any one or two of monosuccinimide, polysuccinimide and boronated succinimide.

4. The additive composition for improving the metal protection ability of water-cooled motor reduction box oil according to claim 1, characterized in that: The extreme pressure anti-wear agent is any one or two of dibutyl lead dithiocarbamate, butyl triphenyl thiophosphate, and dialkyl dithiophosphate.

5. The additive composition for improving the metal protection ability of water-cooled motor reduction box oil according to claim 1, characterized in that: The metal deactivator is a tolyltriazole derivative.

6. The additive composition for improving the metal protection ability of water-cooled motor reduction gearbox oil according to claim 1, characterized in that: The base oil A is a Group II base oil or a Group III base oil.

7. The additive composition for improving the metal protection ability of water-cooled motor reduction gearbox oil according to claim 1, characterized in that: The rust inhibitor is N,N-bis(benzotriazole methylene) oleylamine.

8. The additive composition for improving the metal protection ability of water-cooled motor reduction gearbox oil according to claim 1, characterized in that: The antioxidant is a phenolic antioxidant, and the structural formula is as follows:

9. The method for preparing the additive composition for improving the metal protection ability of water-cooled motor reduction box oil according to any one of claims 1 to 8, characterized in that: Specifically: Add detergent, boronized dispersant, extreme pressure anti-wear agent, rust inhibitor, antioxidant, metal passivator and base oil into the blending kettle in sequence, heat to 65±5°C, and then circulate and stir at this temperature for 3 hours to obtain the additive composition.

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