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CN-121991744-A - Gearbox lubricating oil composition containing ionic liquid and application thereof

CN121991744ACN 121991744 ACN121991744 ACN 121991744ACN-121991744-A

Abstract

The invention relates to the technical field of traditional gearbox lubricating oil, in particular to a gearbox lubricating oil composition containing ionic liquid and application thereof. The gearbox lubricating oil composition comprises 65% -90% of base oil, 1% -20% of special composite additive for automatic gearbox oil, 0.1% -10% of viscosity index improver, 1% -10% of ionic liquid and 0.0001% -1% of anti-foaming agent. The lubricating oil composition containing the ionic liquid for the gearbox can provide effective protection for friction plate parts of the clutch on the premise of protecting lubrication of parts such as gears and bearings, can obviously reduce the probability of shaking in the running process of the gearbox, and improves the durability of the gearbox.

Inventors

  • YANG XIAOCHEN
  • SHI XIAO
  • ZHOU SHAOPENG
  • LEI LING
  • ZHAO HAIPENG
  • ZHOU DIE

Assignees

  • 中国石油化工股份有限公司
  • 中国石化润滑油有限公司

Dates

Publication Date
20260508
Application Date
20241106

Claims (10)

  1. 1. The transmission lubricating oil composition containing the ionic liquid is characterized by comprising, by weight, 65% -90% of base oil, 1% -20% of a special composite additive for automatic transmission oil, 0.1% -10% of a viscosity index improver, 1% -10% of the ionic liquid and 0.0001% -1% of an anti-foaming agent.
  2. 2. The lubricating oil composition for the gearbox of claim 1, which is characterized by comprising, by weight, 70% -90% of base oil, 5% -15% of a special compound additive for the automatic gearbox oil, 0.1% -7% of a viscosity index improver, 2% -10% of an ionic liquid and 0.0001% -0.5% of an anti-foaming agent; Preferably, the anti-foaming agent comprises, by weight, 83% -85% of base oil, 7% -11% of a special composite additive for automatic gearbox oil, 2% -4% of a viscosity index improver, 2.5% -4.5% of an ionic liquid and 0.1% -0.3% of an anti-foaming agent.
  3. 3. Gearbox lubricating oil composition according to claim 1 or 2, characterised in that the base oil is a mineral hydrocarbon, preferably the mineral hydrocarbon is selected from the group consisting of mineral hydrocarbon YUBASE 3 or mineral hydrocarbon XHVI 3; Preferably, the mineral hydrocarbon is obtained by subjecting crude oil to normal pressure and reduced pressure fractionation, solvent extraction and dewaxing, and hydrofining; And/or the base oil has an kinematic viscosity of 1-5 mm 2 /s, preferably 1.5-3.5 mm 2 /s at 100 ℃.
  4. 4. The transmission lubricating oil composition according to any one of claims 1 to 3, wherein in the special compound additive for automatic transmission oil, the mass fraction of calcium is 500 to 1300ppm, the mass fraction of sulfur is 600 to 1400ppm, the mass fraction of phosphorus is 1500 to 3000ppm, the mass fraction of boron is 500 to 1500ppm, and the mass fraction of nitrogen is 2000 to 3200ppm.
  5. 5. The lubricating oil composition for gearboxes according to claim 4, wherein in the special compound additive for automatic gearbox oil, the mass fraction of calcium is 800-1200 ppm, the mass fraction of sulfur is 800-1300 ppm, the mass fraction of phosphorus is 1800-2900 ppm, the mass fraction of boron is 700-1300 ppm, and the mass fraction of nitrogen is 2200-3000 ppm.
  6. 6. The transmission lubricating oil composition of any one of claims 1 to 5, wherein the viscosity index improver is any one or more of a polymethacrylate, an olefin copolymer, a hydrogenated styrene diene copolymer; And/or the average molecular weight of the viscosity index improver is 20000-90000.
  7. 7. The transmission lubricating oil composition of any one of claims 1 to 6, wherein the ionic liquid is any one or more of 1, 3-dialkylimidazole difluorophosphate, bisimidazole hexafluorophosphate, 1-3-alkylimidazole tetrafluoroborate, hexafluorophosphate, tetraalkylphosphonate, diphenylphosphate, quaternary phosphonium salts; preferably, the ionic liquid is any one or more of bis-imidazole hexafluorophosphate, hexafluorophosphate and quaternary phosphonium salt oleic acid.
  8. 8. The transmission lubricating oil composition of any one of claims 1 to 7, wherein the anti-foaming agent is any one or more of a polysiloxane, an acrylate copolymer, an alkyl phosphate, a complex anti-foaming agent, and wherein the complex anti-foaming agent is a mixture of an acrylate and a polysiloxane.
  9. 9. The gearbox lubricating oil composition of any one of claims 1 to 8, wherein the gearbox lubricating oil composition has a kinematic viscosity at 100 ℃ of 2.5 to 5.5mm 2 /s and a kinematic viscosity at 40 ℃ of 15 to 30mm 2 /s; and/or the moisture content of the transmission lubricating oil composition is not higher than 500ppm.
  10. 10. Use of a gearbox lubricating oil composition according to any of claims 1 to 9, characterised in that it is in a gearbox lubricating oil, preferably in a dual clutch gearbox lubricating oil.

Description

Gearbox lubricating oil composition containing ionic liquid and application thereof Technical Field The invention relates to the technical field of traditional gearbox lubricating oil, in particular to a gearbox lubricating oil composition containing ionic liquid and application thereof. Background The gearbox is a gearbox used for changing the movement direction and the transmission ratio in the traditional fuel vehicle transmission system, so that the engine can work in an optimal state, and is one of the most important parts in the whole vehicle. The gearboxes can be classified into manual gearboxes and automatic gearboxes according to the operation modes, wherein the permeability of the automatic gearboxes of passenger vehicles in China exceeds 80%. In order to improve fuel economy and transmission efficiency, the development of passenger car gearbox technology presents a trend of multi-gear, intelligent, light weight and integration. In the aspect of the fuel economy of the automobile, besides the technology of an engine and the fuel consumption, the technical condition of each part of the chassis also directly influences the fuel consumption of the automobile. In the transmission process, 10% -15% of energy is consumed in a chassis transmission system, and mechanical friction brought by parts such as gear transmission, bearings, oil seals, brakes and the like causes higher energy consumption. The existing solution is to add a certain proportion of friction modifier into the lubricating oil of the gearbox to reduce the friction in the boundary lubrication field, thereby improving the lubrication performance and the transmission efficiency. However, as the technical demands of the gearboxes which can provide higher friction transmission torque, smooth gear shifting feel and anti-shake durability become more and more severe, the existing friction modifier schemes cannot simultaneously protect metal components such as gears and bearings and components such as clutch friction plates. Therefore, the problem can be well solved by using the gearbox oil containing the ionic liquid, not only can metal parts in the gearbox be effectively protected, but also the durability of the gearbox can be improved, and the probability of shaking in the running process of the gearbox is obviously reduced. In view of this, the present invention has been made. Disclosure of Invention In order to solve the technical problems, the invention provides a gearbox lubricating oil composition containing ionic liquid and application thereof. Specifically, the present invention has been made to investigate the cause of the above problems, and conventional friction modifiers are mainly classified into three types, namely, organic compounds, organometallic compounds and non-oily compounds, and form a protective film on the friction surface by physical adsorption and chemical adsorption at a certain temperature, thereby reducing the friction coefficient. However, under the influence of factors such as competitive adsorption and the like, under the condition of coexisting with other components in the complexing agent such as an extreme pressure agent, a metal deactivator and the like, the friction modifier is easy to have antagonistic action so as to influence the extreme pressure, corrosion resistance and the like of the lubricating oil, and not only is the durability of the gearbox reduced, but also the ionic liquid serving as the friction modifier well balances the performances. According to the first aspect of the invention, the invention provides an ionic liquid-containing gearbox lubricating oil composition, which comprises, by weight, 65% -90% of base oil, 1% -20% of a special composite additive for automatic gearbox oil, 0.1% -10% of a viscosity index improver, 1% -10% of an ionic liquid and 0.0001% -1% of an anti-foaming agent. The invention discovers that the gearbox oil containing the ionic liquid can well balance the protection capability and friction durability of metal parts of the gearbox. The base oil, the special composite additive for the automatic gearbox oil, the viscosity index improver, the ionic liquid and the anti-foaming agent are limited within reasonable range values, so that a good synergistic effect can be achieved among the components, the obtained gearbox lubricating oil composition can effectively protect metal parts such as gears and bearings, meanwhile, the clutch friction plate parts can be effectively protected, the probability of shaking in the running process of the gearbox is obviously reduced, and the durability of the gearbox is improved. Further, the anti-foaming agent comprises, by weight, 70% -90% of base oil, 5% -15% of a special compound additive for automatic gearbox oil, 0.1% -7% of a viscosity index improver, 2% -10% of an ionic liquid and 0.0001% -0.5% of an anti-foaming agent; Preferably, the anti-foaming agent comprises, by weight, 83% -85% of base oil, 7% -11% of a special composite addit