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CN-121991735-A - Ashless antioxidant composition suitable for ultrahigh-temperature lubrication environment, lubricating oil and application of ashless antioxidant composition

CN121991735ACN 121991735 ACN121991735 ACN 121991735ACN-121991735-A

Abstract

The invention discloses an ashless antioxidant composition suitable for an ultrahigh-temperature lubricating environment, lubricating oil and application thereof, wherein the ashless antioxidant composition comprises, by mass, 2.5-5 parts of dialkyl diphenylamine, 2.5-7.5 parts of N-phenyl-alpha-naphthylamine, 0-2.5 parts of phenolic antioxidants and 0-2.5 parts of amine antioxidants. The ashless antioxidant composition does not contain metal elements, is an ashless antioxidant system, has good antioxidant effect, can effectively control oil viscosity change and acid value increase in an ultra-high temperature environment of 220-300 ℃, has obvious inhibition effect on the generation of high-temperature sediments, and can meet the requirement of an aeroengine on the antioxidant performance of lubricating oil in the ultra-high temperature environment.

Inventors

  • LI JING
  • WANG JIANGBING
  • LV HUIYING
  • TANG ZHONGPING
  • FAN XIU

Assignees

  • 中国石油天然气股份有限公司

Dates

Publication Date
20260508
Application Date
20241108

Claims (10)

  1. 1. The ashless antioxidant composition suitable for the ultra-high temperature lubrication environment is characterized by comprising, by mass, 2.5-5 parts of dialkyl diphenylamine, 2.5-7.5 parts of N-phenyl-alpha-naphthylamine, 0-2.5 parts of phenolic antioxidants and 0-2.5 parts of amine antioxidants.
  2. 2. The composition according to claim 1, wherein the composition comprises, by mass, 2.5-5 parts of dialkyl diphenylamine, 5-7.5 parts of N-phenyl-alpha-naphthylamine, 0-2.5 parts of phenolic antioxidants and 0-2.5 parts of amine antioxidants.
  3. 3. The composition of claim 1 or 2, wherein the dialkyldiphenylamine has the structural formula: Wherein R1 and R2 are H or C1-C12 alkyl.
  4. 4. A composition according to claim 3, wherein R1 and R2 are alkyl groups having a C4, C8 or C10 carbon number.
  5. 5. The composition according to claim 1 or 2, wherein the N-phenyl-alpha-naphthylamine has the formula Ar 1 -NH-Ar 2 ; Wherein Ar 1 、Ar 2 is independently selected from H, phenyl, naphthyl, phenyl or naphthyl with C1-C12 alkyl.
  6. 6. The composition of claim 5, wherein Ar 1 、Ar 2 is selected from the group consisting of phenyl groups each having an alkyl chain attached thereto, said alkyl chain being positioned ortho, meta, or para to the amino group.
  7. 7. A lubricating oil, characterized in that the lubricating oil comprises pentaerythritol ester base oil and the ashless antioxidant composition suitable for the ultra-high temperature lubrication environment according to any one of claims 1-5; The ashless antioxidant composition comprises, by mass, 5-15 parts of an ashless antioxidant composition, and 85-95 parts of pentaerythritol ester base oil.
  8. 8. The lubricating oil according to claim 7, wherein the lubricating oil comprises, by mass, 2.5-5 parts of dialkyl diphenylamine, 2.5-7.5 parts of N-phenyl-alpha-naphthylamine, 0-2.5 parts of phenolic antioxidants, 0-2.5 parts of amine antioxidants and 85-95 parts of pentaerythritol ester base oil.
  9. 9. The lubricating oil according to claim 10, wherein the lubricating oil comprises, by mass, 2.5-5 parts of dialkyl diphenylamine, 5-7.5 parts of N-phenyl-alpha-naphthylamine, 0-2.5 parts of phenolic antioxidants, 0-2.5 parts of amine antioxidants and 85-90 parts of pentaerythritol ester base oil.
  10. 10. Use of the ashless antioxidant composition of any one of claims 1 to 6 in an engine lubrication system suitable for use in an ultra high temperature lubrication environment.

Description

Ashless antioxidant composition suitable for ultrahigh-temperature lubrication environment, lubricating oil and application of ashless antioxidant composition Technical Field The invention relates to the technical field of lubricating oil, in particular to an ashless antioxidant composition suitable for an ultrahigh temperature lubricating environment, lubricating oil and application thereof. Background The lubricating oil plays an important role in reducing friction and abrasion, saving energy, prolonging the service life of machinery and the like as equipment 'blood', and is an important factor affecting the reliability, stability and operation life of equipment. In recent years, along with the rapid development of high-end equipment in aviation industry, automobile industry, rail transit industry, building industry and the like, mechanical equipment is developed towards miniaturization, high power, high efficiency and high reliability, and higher requirements are put on the service performance of lubricating materials under severe working conditions such as high temperature/ultrahigh temperature, low viscosity, heavy load, high speed and high pressure. High-end equipment such as aviation, wind power, rail transit, large-scale mechanical equipment and the like are in a rapid development period, and severe environments such as high temperature/ultrahigh temperature, high speed, high pressure, heavy load, corrosion and the like become normal. For example, an aeroengine is a device for providing power required for flying an aircraft, is a heart of the aircraft, is a direct source of power for the aircraft, is known as a bright bead on a crown of the modern industry, and is an important expression of national science and technology and industrial strength in the development level. The engine used by the civil commercial aircraft, namely the large aircraft at present is a turbofan engine, and along with the expansion of the range of the civil large aircraft, the thrust-weight ratio of the turbofan engine is continuously improved. The thrust weight ratio of the fourth generation turbofan engine is more than 10, the thrust weight ratio of the fifth generation turbofan engine is increased to 12-13, and the thrust weight ratio of the sixth generation turbofan engine under research is expected to be more than 15. The thrust-weight ratio of the turbofan engine is continuously increased, the turbine front temperature of the fifth-generation turbofan engine is already up to 1700 ℃, and the turbine front temperature of the sixth-generation turbofan engine is expected to reach 2000 ℃. The temperature of the main bearing nearby is directly influenced by the temperature increase of the front temperature of the turbine, so that the temperature of an engine lubrication system is also increased, the working temperature of the turbofan engine lubrication system is increased to be more than 260 ℃, and the existing lubricating oil cannot meet the requirement of an aeroengine on the oxidation resistance of the lubricating oil in an ultra-high temperature (220-300 ℃) environment. Disclosure of Invention In order to meet the demands of an aeroengine on the oxidation resistance of lubricating oil in an ultra-high temperature environment (220-300 ℃), improve the oxidation resistance of an antioxidant composition, enrich technical routes and increase selection space, the embodiment of the invention provides an ashless antioxidant composition suitable for the ultra-high temperature lubricating environment, lubricating oil and application thereof. In a first aspect, the embodiment of the invention provides an ashless antioxidant composition suitable for an ultra-high temperature lubrication environment, which comprises, by mass, 2.5-5 parts of dialkyl diphenylamine, 2.5-7.5 parts of N-phenyl-alpha-naphthylamine, 0-2.5 parts of phenolic antioxidants and 0-2.5 parts of amine antioxidants. In a preferred embodiment, the ashless antioxidant composition comprises, by mass, 2.5-5 parts of dialkyl diphenylamine, 5-7.5 parts of N-phenyl-alpha-naphthylamine, 0-2.5 parts of phenolic antioxidants and 0-2.5 parts of amine antioxidants. In one embodiment, the dialkyldiphenylamine has the structural formula: Wherein R1 and R2 are H or C1-C12 alkyl. In a preferred embodiment, R1 and R2 are C4, C8 or C10 alkyl groups. In one embodiment, the N-phenyl-alpha-naphthylamine has the formula Ar 1-NH-Ar2; Wherein Ar 1、Ar2 is independently selected from H, phenyl, naphthyl, phenyl or naphthyl with C1-C12 alkyl. In another embodiment, ar 1、Ar2 employs phenyl groups each having an alkyl chain attached thereto at a position ortho, meta, or para to the amino group. In a second aspect, embodiments of the present invention provide a lubricating oil comprising a pentaerythritol ester base oil and an ashless antioxidant composition suitable for use in an ultra-high temperature lubricating environment as described in the first aspect; The ashless antioxidant compositio