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CN-122012160-A - Hydraulic retarder oil composition

CN122012160ACN 122012160 ACN122012160 ACN 122012160ACN-122012160-A

Abstract

The invention discloses a long-life hydraulic retarder oil composition which comprises, by weight, 6-8% of polyol ester, 11-12% of metallocene poly alpha olefin mPAO, 13.2-17% of a composite additive, 0.6-1.0% of an antioxidant, 0.8-1.2% of a metal corrosion inhibitor, 0.2-0.4% of a pour point depressant, and the balance of hydrogenated base oil. The high-viscosity mPAO is adopted to replace the traditional viscosity index improver, and the metal corrosion inhibitor is compounded, so that the thermal oxidation stability of the oil product is improved, the catalytic aging process of metal to the oil product is reduced, the formation of oil sludge and carbon deposit is reduced, the corrosion of copper metal parts is effectively inhibited, the corrosion performance of the oil product to the metal parts of the hydraulic retarder is reduced under the high-temperature condition, the service life of the oil product is prolonged, and the oil change mileage of 30 ten thousand kilometers can be achieved.

Inventors

  • CUI JUN
  • SHI YINGFEI
  • YANG CAO
  • SHI JUNFENG

Assignees

  • 江苏龙蟠新材料科技有限公司
  • 江苏龙蟠科技集团股份有限公司

Dates

Publication Date
20260512
Application Date
20251230

Claims (10)

  1. 1. The hydraulic retarder oil composition is characterized by comprising the following components in percentage by weight: 6-8% of polyol ester, 11-12% of metallocene poly alpha olefin mPAO, 13.2-17% of composite additive, 0.6-1.0% of antioxidant, 0.8-1.2% of metal corrosion inhibitor, 0.2-0.4% of pour point depressant and the balance of hydrogenated base oil.
  2. 2. The hydrodynamic retarder oil composition according to claim 1, wherein the polyol ester has a kinematic viscosity of 4-6 mm 2 /s at 100 ℃.
  3. 3. The hydrodynamic retarder oil composition of claim 1, wherein the metallocene polyalphaolefin mPAO has a kinematic viscosity of 150-350 mm 2 /s at 100 ℃.
  4. 4. The hydraulic retarder oil composition according to claim 1, wherein the metal corrosion inhibitor is at least one of benzotriazole derivatives, alkyl thiadiazoles, imidazoline derivatives, N-acyl sarcosines.
  5. 5. The hydraulic retarder oil composition according to claim 4, wherein the metal corrosion inhibitor is composed of an imidazoline derivative and N-acyl sarcosine according to a mass ratio of 1:0.6-1.4.
  6. 6. The hydraulic retarder oil composition according to claim 1, wherein the composite additive meets D1 specification requirements in GB 11122-2025, including detergent-dispersants, anti-oxidant preservatives, antiwear additives, antioxidants, rust inhibitors and friction modifiers, and the composite additive producer includes run-in, yafuton, lu Borun.
  7. 7. The hydraulic retarder oil composition according to claim 1, wherein the antioxidant is at least one of an amine and a phenolic antioxidant.
  8. 8. The hydraulic retarder oil composition according to claim 7, wherein the antioxidant is a combination of amine and phenolic antioxidants according to a mass ratio of 3:5-2:1.
  9. 9. The hydrodynamic retarder oil composition of claim 1, wherein the pour point depressant is a polymethacrylate.
  10. 10. The hydrodynamic retarder oil composition of claim 1, wherein the hydrogenated base oil is at least one of class II 500N, III class 100N, III class 150N.

Description

Hydraulic retarder oil composition Technical Field The invention relates to a lubricating oil composition, in particular to a hydrodynamic retarder oil composition. Background The hydraulic retarder is used as an important auxiliary braking device for vehicles and is widely applied to commercial vehicles such as heavy trucks, buses and the like. The brake torque is generated by stirring the working fluid, and in the process, the working fluid can absorb and dissipate a large amount of kinetic energy, so that the temperature of the oil product is rapidly increased in a very short time, and the temperature can often reach 160 ℃ or more, even instantly exceeds 180 ℃. Such extreme operating conditions place extremely demanding demands on the lubricating oil. Currently, some hydrodynamic retarders on the market use engine oil or gear oil as working medium. However, these oils have the inherent disadvantages of 1. Poor high temperature corrosion performance, in which sulfur element in the oil reacts easily on metal parts, especially copper metal, to cause corrosion of copper metal parts and further to catalyze aging and deterioration of the oil, 2. Insufficient thermal oxidation stability, in which oxidation and cracking of base oil and additives are easily caused at a continuous high temperature to cause viscosity increase of the oil, sludge and carbon deposition to cause clogging of fine oil passages and heat exchangers inside the retarder, and efficiency decline and even failure, 3. Short service life, in which frequent oil changes are required due to a rapid oxidation decay rate, increasing maintenance costs and downtime for users. Therefore, the special oil for the hydraulic retarder, which can resist high temperature and metal corrosion for a long time and reduce the generation of carbon deposition oil sludge, is developed, so that the oil change period and the service life of equipment are obviously prolonged, and the special oil has great practical significance and market value. Disclosure of Invention The invention aims to provide long-life lubricating oil specially designed for severe working conditions of a hydraulic retarder. The hydraulic retarder oil composition comprises the following components in percentage by weight: 6-8% of polyol ester, 11-12% of metallocene poly alpha olefin mPAO, 13.2-17% of composite additive, 0.6-1.0% of antioxidant, 0.8-1.2% of metal corrosion inhibitor, 0.2-0.4% of pour point depressant and the balance of hydrogenated base oil. Preferably, the polyol ester has a kinematic viscosity of 4-6 mm 2/s at 100 ℃. Preferably, the metallocene poly alpha olefin mPAO has a kinematic viscosity of 150-350 mm 2/s at 100 ℃, and more preferably has a kinematic viscosity of 300mm 2/s at 100 ℃. Preferably, the metal corrosion inhibitor is at least one of benzotriazole derivatives, alkyl thiadiazole, imidazoline derivatives and N-acyl sarcosine. Preferably, the metal corrosion inhibitor is composed of an imidazoline derivative and N-acyl sarcosine according to a mass ratio of 1:0.6-1.4. Preferably, the composite additive meets the D1 technical specification requirements in GB 11122-2025 and comprises a detergent dispersant, an antioxidant preservative, an antiwear additive, an antioxidant, an antirust agent and a friction improver. Preferably, the antioxidant is at least one of amine and phenol antioxidants. Preferably, the antioxidant is a combination of amine and phenolic antioxidants according to a mass ratio of 3:5-2:1. Further preferably, the amine antioxidant is at least one of octyl diphenylamine, butyl diphenylamine, nonyl diphenylamine and alkyl diphenylamine. Further preferred phenolic antioxidants are phenolic antioxidants, such as T501. Preferably, the pour point depressant is polymethacrylate. Preferably, the hydrogenated base oil is at least one of class II 500N, III class 100N, III class 150N. Compared with the prior art, the invention has the advantages that the corrosion of copper metal parts is inhibited by compounding the metal corrosion inhibitor, the catalytic aging process of corrosive metal to oil products is reduced, the thermal oxidation stability is improved, the generation of oil sludge is reduced, the corrosiveness of the oil products to the metal parts of the hydraulic retarder is reduced under the high-temperature condition, the service life of the oil products is prolonged, and the 30 ten thousand kilometers oil change mileage is reached. Meanwhile, metallocene mPAO is used for replacing the traditional viscosity index improver, so that the generation of carbon deposit under the high-temperature condition is reduced. Drawings FIG. 1 is a schematic view showing the appearance of a test for forming a gel sheet according to example 1 of the present invention. FIG. 2 is a schematic view showing the appearance of the test of the glue plate according to example 2 of the present invention. FIG. 3 is a schematic view showing the appearance of the test of the glue plat