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

Abstract

The application discloses an additive composition for improving the oil metal protection capability of a water-cooled motor reduction gearbox, which comprises the following components in percentage by mass: detergent 1.5-3.0%, boronized dispersant 50-80%, extreme pressure anti-wear agent 3.5-5.0%, rust inhibitor 1.0-2.0%, antioxidant 5.0-6.0%, metal passivator 0.1-0.6%, and the rest is base oil A; the sum of the percentage by mass of the above components is 100%. The application further discloses a preparation method of the additive composition, specifically: the detergent, boronized dispersant, extreme pressure anti-wear agent, rust inhibitor, antioxidant, metal passivator and base oil are sequentially added into a blending kettle and heated and stirred, and then the additive composition is obtained. After the composition is blended with the base oil, the lubricating oil additive can improve the passivation metal activity and the rust-proof performance, the phenolic antioxidant in the composition can effectively complex metal ions and greatly reduce the generation of oil sludge.

Description

Technical Field

[0001] This invention belongs to the technical field of lubricating oil additive compositions, specifically relating to an additive composition for improving the metal protection capability of water-cooled motor gearbox oil, and also relating to a method for preparing the additive composition. Background Technology

[0002] Pure electric vehicle transmission systems are categorized into water-cooled motor and gearbox systems and oil-cooled motor and gearbox systems based on their motor cooling methods. These mainly include water-cooled motor + single-stage gearbox, oil-cooled motor + single-stage gearbox, and oil-cooled motor + multi-stage gearbox, with water-cooled motor + single-stage gearbox being the most widely used. Water-cooled motors require oils with excellent gear and bearing protection properties, as well as superior low-temperature fluidity and shear stability. More and more automakers are looking to use a single oil that meets the needs of both water-cooled and oil-cooled motors, and with the increasing speed of motors, higher requirements are being placed on the copper corrosion resistance of the oil.

[0003] Chinese Patent (Application No.: 201710208905.1, Publication No.: CN106929129A) discloses a composition and preparation method for transmission fluid in pure electric vehicles. It employs functional additives such as viscosity index improvers, detergents and dispersants, antioxidants, corrosion inhibitors, anti-wear agents, friction modifiers, anti-aging agents, and anti-foaming agents. The resulting oil exhibits excellent oxidation stability, anti-foaming properties, and anti-wear and anti-corrosion characteristics. Chinese Patent (Application No.: 201711446516.9, Publication No.: CN108218835A) discloses the preparation of an extreme pressure anti-wear agent and its application in transmission fluid for new energy electric vehicles. It uses 2-pyrrole dithioacetamidoamine, detergents, ashless dispersants, and hydrogenated base oil for blending. The product has low viscosity, low friction, low oil loss, and significantly lower corrosion to metals compared to similar products on the market. Chinese Patent (Application No.: 202211561215.1, Publication No.: CN116041193A) discloses a novel alkylglycerolamine gemini surfactant, its preparation method, and its application. The synthesis process is simple, and it is used as a novel alkylglycerolamine gemini surfactant with antibacterial properties. Chinese Patent (Application No.: 201310093365.9, Publication No.: CN104059715B) discloses an antioxidant composition, a lubricating oil composition containing the antioxidant composition, and a method for improving the antioxidant properties of lubricating oil. The antioxidant composition includes alkylphenylnaphthylamine, phenothiazine, and hindered sulfurization phenol. The antioxidant composition and the lubricating oil composition are low in sulfur, low in ash, and phosphorus-free, exhibiting good thermal stability. They can significantly improve the oxidation stability of lubricating oil under high-temperature conditions and metal ion catalytic conditions, effectively extending the service life of lubricating oil. Furthermore, they can effectively control the formation trend of deposits under high-temperature conditions, meeting the requirements for formulating high-grade lubricating oils. Summary of the Invention

[0004] The purpose of this invention is to provide an additive composition that improves the metal protection capability of the oil in the gearbox of a water-cooled motor, thereby enhancing the passivation activity and rust prevention performance of the lubricating oil additive.

[0005] The technical solution adopted in this invention is an additive composition for improving the metal protection capability of water-cooled motor gearbox oil, comprising the following components by mass percentage: detergent 1.5-3.0%, boronized dispersant 50-80%, extreme pressure anti-wear agent 3.5-5.0%, rust inhibitor 1.0-2.0%, antioxidant 5.0-6.0%, metal passivator 0.1-0.6%, with the balance being base oil A; the sum of the mass percentages of the above components is 100%.

[0006] The invention is further characterized in that,

[0007] The detergent is any one or two of high-alkalinity sulfonates, high-alkalinity phenolates, and thiosulfates.

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

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

[0010] The metal passivating agent is a toluenetriazole derivative.

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

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

[0013] The antioxidant is a phenolic antioxidant.

[0014] Another technical solution adopted in this invention is a method for preparing an additive composition to improve the metal protection capability of water-cooled motor gearbox oil. Specifically, the additive composition is prepared by sequentially adding detergent, boronized dispersant, extreme pressure anti-wear agent, rust inhibitor, antioxidant, metal passivator and base oil into a mixing vessel, heating to 65±5℃, and then circulating and stirring at this temperature for 3 hours to obtain the additive composition.

[0015] The beneficial effects of the present invention are: after the composition of the present invention is blended with the base oil, it can improve the metal passivation activity and rust prevention performance of the lubricating oil additive, improve the protective ability of the lubricating oil on the metal, and the phenolic antioxidant in the composition can effectively complex metal ions in addition to its excellent antioxidant performance, thus having a metal passivation effect and greatly reducing the formation of sludge. Detailed Implementation

[0016] The present invention will now be described in detail with reference to specific embodiments.

[0017] This invention relates to an additive composition for improving the metal protection capability of water-cooled motor gearbox oil, comprising the following components by mass percentage: detergent 1.5-3.0%, boronized dispersant 50-80%, extreme pressure anti-wear agent 3.5-5.0%, rust inhibitor 1.0-2.0%, antioxidant 5.0-6.0%, metal passivator 0.1-0.6%, with the balance being 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-alkalinity sulfonates, high-alkalinity phenolates, and thiosulfates;

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

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

[0021] The metal passivating agent is a toluenetriazole derivative, which can form a chemical protective film on the metal surface, prevent it from becoming ions, catalyze the oxidation of oil, and prevent corrosion from sulfur and organic acids.

[0022] Base oil A is a Group II or Group III base oil with a suitable viscosity that does not affect the flash point or other physicochemical properties 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 subjected to reflux reaction (reaction time is 10 h) to prepare N,N-bis(benzotriazole methylene)oleylamine. The reaction equation is as follows:

[0025]

[0026] Compared with existing N,N-bis(benzotriazolemethylene)laurylamine, the oleylamine group in N,N-bis(benzotriazolemethylene)oleylamine has better oil solubility and excellent solubility, which can improve the passivation activity and rust prevention performance of lubricating oil additives and enhance the protective ability of lubricating oil on metals.

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

[0028]

[0029] The antioxidant of this invention not only possesses excellent antioxidant properties but also effectively complexes metal ions, exhibiting metal passivation effects and significantly reducing sludge formation. Furthermore, the antioxidant has low volatility, further reducing its volatilization at high temperatures. The composition exhibits stable performance, meeting the lubrication requirements of water-cooled motor gearbox systems.

[0030] The preparation method of the additive composition for improving the metal protection capability of water-cooled motor gearbox oil according to the present invention is as follows: detergent, boronized dispersant, extreme pressure anti-wear agent, rust inhibitor, antioxidant, metal passivator and base oil are added to a mixing vessel in sequence, heated to 65±5℃, and then stirred in a full-volume circulation at this temperature for 3 hours to obtain the product, which is a brownish-brown oily liquid.

[0031] Example 1

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

[0033] Table 1 Composition of the additive composition

[0034]

[0035]

[0036] Example 2

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

[0038] Table 2 Composition of the additive composition

[0039] name Dosage (percentage by mass) High base value sulfonates 2.0 Monosuccinimide 70.1 Lead dibutyldithiocarbamate 4.5 N,N-bis(benzotriazine methylene)oleylamine 1.0 Phenolic antioxidants 4.5 Toluenetriazole derivatives 0.2 Group II base oils 17.7

[0040] Example 3

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

[0042] Table 3 Composition of the additive composition

[0043]

[0044]

[0045] Example 4

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

[0047] Table 4 Composition of the additive composition

[0048] name Dosage (percentage by mass) High base value sulfide alkylphenol salts 3.0 Boronized succinimide 67.5 Butyltriphenylthiophosphate 5.0 N,N-bis(benzotriazine methylene)oleylamine 1.5 Phenolic antioxidants 6.0 Toluenetriazole derivatives 0.5 Group II base oils 16.5

[0049] Example 5

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

[0051] Table 5 Composition of the additive composition

[0052]

[0053]

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

[0055] The test results of the blended oils using Examples 1-5 are shown in Table 6:

[0056] Table 6 Test Results of Oil Products

[0057]

[0058] The data from the oils prepared in Examples 1-5 show that while all data meet industry standards, current automakers require a single oil that can handle both water-cooled and oil-cooled motors. Furthermore, with the increasing speed of motors, higher demands are being placed on the copper corrosion and oxidation resistance of the oils. We aim to improve the copper corrosion and oxidation resistance of existing oils. Examples 3 and 4 demonstrate that the N,N-bis(benzotriazole methylene) oleamide, at an addition rate of 1.0%–2.0%, and the phenolic antioxidant at 5.0%–6.0%, exhibit a synergistic effect that maintains a copper corrosion rating of at least 1 grade at 150°C for 168 hours. Moreover, the Cu content in the oil is lower than the 200 ppm requirement of the industry standard for pure electric vehicle gearbox oils (oil-cooled motors), indicating superior oxidation stability. This effectively improves the passivation activity and rust prevention performance of lubricating oil additives, enhancing the lubricating oil's protective ability and oxidation resistance.

Claims

1. An additive composition for improving the metal protection capability of water-cooled motor gearbox oil, characterized in that, The composition by weight percentage includes the following components: detergent 1.5-3.0%, boronized dispersant 50-80%, extreme pressure anti-wear agent 3.5-5.0%, rust inhibitor 1.0-2.0%, antioxidant 5.0-6.0%, metal passivator 0.1-0.6%, and the balance is base oil A; The detergent is any one or two of high-base-value sulfonates and high-base-value sulfurized alkylphenol salts; the base oil A is a Group II base oil or a Group III base oil. The antioxidant is a phenolic antioxidant, with the following structural formula: The boronized dispersant is boronized succinimide; the extreme pressure anti-wear agent is any one or two of dibutyl dithiocarbamate, butyl triphenyl thiophosphate, and dialkyl dithiophosphate; the metal passivating agent is a toluenetriazole derivative; and the rust inhibitor is N,N-bis(benzotriazolemethylene)oleylamine.

2. The method for preparing the additive composition for improving the metal protection capability of water-cooled motor gearbox oil as described in claim 1, characterized in that, Specifically, the detergent, boronized dispersant, extreme pressure anti-wear agent, rust inhibitor, antioxidant, metal passivator and base oil A are added to the mixing vessel in sequence, heated to 65±5℃, and then stirred in a full-volume circulation at this temperature for 3 hours to obtain the additive composition.

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