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CN-121991742-A - Long-life hydraulic oil composition and preparation method thereof

CN121991742ACN 121991742 ACN121991742 ACN 121991742ACN-121991742-A

Abstract

The invention belongs to the field of special oil for hydraulic systems, and particularly relates to a long-life hydraulic oil composition and a preparation method thereof. The long-life hydraulic oil composition comprises, by mass, 0.01% -1.0% of amine antioxidants, 0.01% -1.0% of phenolic antioxidants, 0.01% -1.0% of antioxidant antiwear agents, 0.1% -1.0% of rust inhibitors, 0.01% -0.1% of metal deactivators, 0.01% -0.1% of anti-foaming agents and 95.8% -99.85% of base oil. The long-life hydraulic oil composition can effectively prolong the service life and the oil change period of hydraulic oil by adopting an antioxidant phenol-ammonia compound technology, and the oil product has excellent oxidation resistance, rust resistance, abrasion resistance, super-long service life and the like, particularly has excellent high-temperature oxidation resistance, can ensure that the service life of hydraulic equipment is prolonged in a severe working environment, and prolongs the oil change period.

Inventors

  • LI MENG
  • WU FULI
  • LIU ZHONGGUO
  • SUN DAXIN
  • CHANG XIAO
  • ZHANG WENJIE

Assignees

  • 中国石油天然气股份有限公司

Dates

Publication Date
20260508
Application Date
20241104

Claims (13)

  1. 1. The long-life hydraulic oil composition is characterized by comprising, by mass, 0.01% -1.0% of an amine antioxidant, 0.01% -1.0% of a phenolic antioxidant, 0.01% -1.0% of an antioxidant antiwear agent, 0.1% -1.0% of an antirust agent, 0.01% -0.1% of a metal deactivator, 0.01% -0.1% of an anti-foaming agent and 95.8% -99.85% of base oil.
  2. 2. The long life hydraulic fluid composition of claim 1 wherein said amine antioxidant is an alkylated diphenylamine.
  3. 3. The long life hydraulic oil composition of claim 2 wherein said amine antioxidant is of the type antioxidant L57.
  4. 4. The long life hydraulic fluid composition of claim 1 wherein said phenolic antioxidant is 2, 6-di-t-butyl-p-cresol.
  5. 5. The long life hydraulic fluid composition of claim 1 wherein said antioxidant antiwear agent is zinc dialkylthiophosphate having a zinc content of not less than 5% and a phosphorus content of not less than 6%.
  6. 6. The long life hydraulic oil composition of claim 5 wherein said antioxidant antiwear agent is of the type antioxidant antiwear agent T203.
  7. 7. The long life hydraulic oil composition of claim 1 wherein said rust inhibitor is barium dinonylnaphthalene sulfonate having a barium content of not less than 10%.
  8. 8. The long life hydraulic oil composition of claim 1 wherein said rust inhibitor is of the type rust inhibitor T705.
  9. 9. The long life hydraulic fluid composition of claim 1 wherein said metal deactivator is a benzotriazole derivative.
  10. 10. The long life hydraulic fluid composition of claim 9 wherein said metal deactivator is the metal deactivator IRGAMET 39.
  11. 11. The long life hydraulic fluid composition of claim 1 wherein said anti-foaming agent is methyl silicone oil.
  12. 12. The long life hydraulic oil composition of claim 1 wherein said base oil is a hydrofinished base oil, said base oil being 500N in model number.
  13. 13. A method of preparing the long life hydraulic fluid composition of any one of claims 1-12 comprising the steps of: and uniformly mixing the amine antioxidant, the phenolic antioxidant, the antioxidant antiwear agent, the antirust agent, the metal deactivator, the anti-foaming agent and the base oil at 55-65 ℃ to obtain the long-life hydraulic oil composition.

Description

Long-life hydraulic oil composition and preparation method thereof Technical Field The invention belongs to the field of special oil for hydraulic systems, and particularly relates to a long-life hydraulic oil composition and a preparation method thereof. Background The length of the oil change period is directly related to the cost of using the hydraulic oil, and is also the most critical influencing factor in the market of the hydraulic oil product, and the oxidation resistance, rust resistance and wear resistance of the hydraulic oil are the direct performances for determining the oil change period of the hydraulic oil. In the actual use process, the hydraulic oil is inevitably contacted with metal elements, and is oxidized under the actions of illumination, heat and oxygen, and a series of free radical oxidation reactions are generated when hydrocarbons in the hydraulic oil are contacted with air. The oxidation of hydraulic oil at normal temperature is very slow, i.e. the oxidation is not obvious at temperatures below 94 ℃ and at normal atmosphere, and when the temperature exceeds 94 ℃, the oxidation rate becomes more obvious, and the effect of the general temperature is that the oxidation rate is doubled every 10 ℃ rise. The plunger pump, the servo valve system and the like in the hydraulic system have common friction and wear phenomena, and under the action of pressure, the hydraulic oil with excellent wear resistance can fully lubricate the machine, reduce friction and wear of parts and prevent sintering, thereby improving the mechanical efficiency, reducing the energy consumption and prolonging the service life of the machine. Corrosion or discoloration due to oxygen, water and other impurities is known as rust or tarnish, and the erosion damage that occurs in highly corrosive chemical media is known as corrosion. In order to prevent the metal from rusting, the most effective and economical method is to smear the medium (oil or water) added with the rust inhibitor on the metal to form an adsorption film, and isolate the adsorption film from external moisture, oxygen and other impurities to achieve the purpose of rust prevention. The hydraulic oil with excellent rust resistance can form a protective film on the metal surface in the running process of equipment, effectively isolate air and water from contacting with the metal surface, and further achieve the rust resistance effect. The Chinese patent application CN115992025A discloses a long-life hydraulic oil composition which has excellent oxidation resistance, wherein the oxidation resistance enables an oil product to have excellent oxidation resistance, can meet the specification requirements of HV and HS hydraulic oil in GB11118.1-2011, and is particularly suitable for the use working conditions of engineering mechanical equipment which operates at a higher temperature for a long time. The Chinese patent application CN112592755A provides a high-efficiency ashless hydraulic oil complexing agent composition which can be used for blending ashless anti-wear hydraulic oil and has better anti-wear and anti-oxidation properties. At present, the universal HM antiwear hydraulic oil is used in a high-pressure plunger pump for a long time, more oxidized oil sludge is generated, the corrosion phenomenon of equipment is more common, the abrasion of the hydraulic oil is large, and the description of a long-service-life hydraulic oil composition developed for prolonging the oil change period performance characteristic is not found in the prior art. In the running process of the equipment, the plunger pump continuously pressurizes, works on the oil product, generates heat, accelerates the oxidation of the oil product, simultaneously rubs the plunger pump pin and the plunger and contacts water to generate corrosion, and the hydraulic oil with excellent oxidation resistance, rust resistance and abrasion resistance needs to be developed, so that the oil change period is prolonged. Through technical accumulation for many years, the current advanced hydrofining process technology of domestic base oil is mature, the performance of the additive is also greatly improved, the technical conditions for developing hydraulic oil are provided, and hydraulic oil products with excellent performance and longer oil change period are urgently needed to be developed. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a long-life hydraulic oil composition and a preparation method thereof. In order to achieve the above purpose of the present invention, the present invention adopts the following specific technical scheme: the long-life hydraulic oil composition comprises, by mass, 0.01% -1.0% of amine antioxidants, 0.01% -1.0% of phenolic antioxidants, 0.01% -1.0% of antioxidant antiwear agents, 0.1% -1.0% of rust inhibitors, 0.01% -0.1% of metal deactivators, 0.01% -0.1% of anti-foaming agents and 95.8% -99.85% of base oil. Preferably, the amine an