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CN-122012159-A - Automatic gearbox oil complexing agent and preparation method thereof

CN122012159ACN 122012159 ACN122012159 ACN 122012159ACN-122012159-A

Abstract

The invention discloses an automatic gearbox oil complexing agent and a preparation method thereof, and the automatic gearbox oil complexing agent is characterized by comprising, by mass, 0.6-1.5% of a detergent, 30-55% of a dispersing agent, 3-7% of an antioxidant, 3-9% of an extreme pressure antiwear agent, 5-10% of a friction modifier, 1-2% of a rust inhibitor, 20-30% of a viscosity index improver and the balance of neutral base oil, wherein the dispersing agent is a combination of self-made phosphorus-boronated polyisobutylene succinimide (PIB molecular weight Mn is 550-750) and high molecular weight polyisobutylene succinimide (PIB molecular weight Mn is 1300-2300) or low molecular weight polyisobutylene succinimide (PIB molecular weight Mn is 550-900). The automatic gearbox oil prepared by the automatic gearbox oil complexing agent can provide friction performance for various types of AT automatic gearboxes within a full temperature range, has excellent gear shifting feeling, has excellent anti-vibration durability, and can effectively prolong the service life and oil change period of the automatic gearboxes.

Inventors

  • LIU XIAODONG
  • YANG CHAO
  • HU XUEYAN
  • HAN ZHIFENG
  • LI GUOPENG
  • ZHU TAO

Assignees

  • 新乡市瑞丰新材料股份有限公司

Dates

Publication Date
20260512
Application Date
20251205

Claims (9)

  1. 1. The automatic gearbox oil complexing agent is characterized by comprising, by mass, 0.6-1.5% of a detergent, 30-55% of a dispersing agent, 3-7% of an antioxidant, 3-9% of an extreme pressure antiwear agent, 5-10% of a friction modifier, 1-2% of an antirust agent, 20-30% of a viscosity index improver and the balance of neutral base oil, The dispersant is a combination of self-made phosphorus-boronated polyisobutylene succinimide (PIB molecular weight Mn of 550-750) and high molecular polyisobutylene succinimide (PIB molecular weight Mn of 1300-2300) or low molecular polyisobutylene succinimide (PIB molecular weight Mn of 550-900).
  2. 2. The automatic transmission oil composition according to claim 1, wherein in the automatic transmission oil composition, a ratio of high molecular weight polyisobutylene succinimide (PIB molecular weight Mn of 1300 to 2300) to self-made phosphorus-boronated polyisobutylene succinimide (PIB molecular weight Mn of 550 to 750) or low molecular weight polyisobutylene succinimide (PIB molecular weight Mn of 550 to 900) is 2:3 to 3:5 by mass.
  3. 3. The automatic transmission oil complexing agent of claim 1 wherein said detergent is at least one of high base number boron compound calcium sulfonate (300 TBN), high base number alkyl salicylate (350 TBN), high base number sulfurized calcium alkyl phenate (250 TBN).
  4. 4. The automatic transmission oil complexing agent of claim 1, wherein the rust inhibitor is at least one of an amide rust inhibitor, an alkenyl succinic acid derivative, and an imidazoline rust inhibitor.
  5. 5. The automatic transmission oil complexing agent of claim 1, wherein the extreme pressure antiwear agent is at least one of oleyl alcohol phosphite and alkyl phosphonate.
  6. 6. The automatic gearbox oil complexing agent according to claim 5, wherein the extreme pressure antiwear agent is a combination of oleyl alcohol phosphite and alkyl phosphonate, and the ratio of oleyl alcohol phosphite to alkyl phosphonate in the automatic gearbox oil complexing agent is 4:2-6:2 by mass.
  7. 7. The automatic transmission oil complexing agent of claim 1 wherein said friction modifier is at least one of a C 9 -C 10 thiadiazole thiol condensate, glycerol isostearate.
  8. 8. The automatic transmission oil complexing agent according to claim 7, wherein the friction modifier is a combination of glyceryl isostearate and a C 9 -C 10 thiadiazole thiol condensate, and the ratio of glyceryl isostearate to C 9 -C 10 thiadiazole thiol condensate in the automatic transmission oil complexing agent is 5:3-5:1 by mass.
  9. 9. A method for preparing an automatic gearbox oil complexing agent according to any one of claims 1-8, which is characterized in that 30-55 mass% of dispersing agent and 0.6-1.5 mass% of detergent are added into a container, the temperature is raised to 50-65 ℃ while stirring, 3-7 mass% of antioxidant, 3-9 mass% of extreme pressure antiwear agent, 1-2 mass% of antirust agent, 5-10 mass% of friction modifier, 20-30 mass% of viscosity index improver and the balance of base oil are sequentially added, the mixture is kept at 50-65 ℃ and stirred for 2.5-3 hours, and the mixture is filtered to obtain the automatic gearbox oil complexing agent, The dispersant is a combination of self-made phosphorus-boronated polyisobutylene succinimide (PIB molecular weight Mn of 550-750) and high molecular polyisobutylene succinimide (PIB molecular weight Mn of 1300-2300) or low molecular polyisobutylene succinimide (PIB molecular weight Mn of 550-900).

Description

Automatic gearbox oil complexing agent and preparation method thereof Technical Field The invention relates to the field of lubricating oil additives, in particular to an automatic gearbox oil complexing agent and a preparation method thereof. Background Automatic transmission oil (ATF) is an important lubricating medium in automotive transmission systems, whose performance directly affects the operating efficiency and service life of the automatic transmission. With the development of the automobile industry, the performance requirements of the automatic gearbox oil are also higher and higher, and particularly, the requirements on high-temperature working conditions, friction characteristics, wear resistance and the like are put forward. Specifically, general automobiles first proposed the automotive automatic transmission oil specifications. Further, currently, the internationally known automobile manufacturers have respective automatic transmission oil specifications, such as general-purpose Dexron VI, ford Ford MERCON LV, toyota/Lexus TYPE T/T-II/T-III/T-IV, BMW MINI 83 220 402 413, NISSAN MATIC S, and other OEM specifications. At present, although the oil performance requirements of the automatic gearbox are different from each other according to different OEM specifications, the oil performance requirements of the automatic gearbox are high, and the oil has high requirements on the antioxidant performance, the friction characteristic, the anti-vibration performance and the extreme pressure wear resistance. Taking Dexron VI specification as an example, the requirements for friction characteristics (P-disk friction test) and anti-shudder performance (ASD test) are extremely stringent. Because automotive power transmission fluids require specific friction characteristics under extremely severe temperature and pressure conditions to ensure proper operation of the vehicle. At present, the automatic gearbox oil on the market is mainly prepared by compounding agents consisting of base oil and various additives, and no compounding agent product meeting the above OEM specification exists, so that the automatic gearbox oil compounding agent has great improvement space in friction characteristics and anti-vibration performance. In addition, the automatic gearbox oil complexing agent in the prior art has the following problems of (1) balancing friction characteristics, anti-vibration performance and extreme pressure wear resistance, and improving the dispersion performance of the automatic gearbox oil, and (2) the automatic gearbox oil needs to be more excellent in thermal oxidation stability and cleaning dispersion under the high-temperature working condition (about 160 ℃). As conventional techniques for the actual situations of the automatic transmission oil, patent documents 1 and 2 and the like are proposed. Patent document 1 discloses a long-life ATF automatic gearbox oil and a preparation method thereof, wherein triphenyl thiophosphate is used as an extreme pressure antiwear agent, a friction modifier is glycol oleate, the balance of the antiwear property and friction characteristic and the high-temperature cleaning dispersion property of the oil product are not reflected, the oil product is evaluated by rotating an oxygen bomb only, and the friction durability and the cleaning dispersion property of the oil product cannot be ensured. Patent document 2 discloses a combined application of low-viscosity automatic gearbox oil, which uses dioctyl diphenylamine as an antioxidant and calcium sulfonate as a detergent, a detergent dispersant and high-temperature thermal oxidation performance evaluation are not shown in the patent, if no dispersant is added in a formula, oil sludge is easy to generate at high temperature, and the oil change period is possibly shorter. Therefore, there is a need to develop a high sludge dispersion, excellent friction characteristics and anti-shudder properties suitable for use with different types of automotive automatic transmission oils (ATFs) to meet the usage needs of different automobiles. Prior art literature Patent literature Patent document 1, CN1186855215A Patent document 2 CN117778081A Disclosure of Invention The invention provides an automatic gearbox oil complexing agent, which aims to solve the problems of the prior art that the automatic gearbox oil has balanced friction characteristic, anti-vibration performance and extreme pressure abrasion resistance, and insufficient thermal oxidation stability and cleaning dispersibility under high-temperature working conditions, and the like, and realize excellent thermal cleaning dispersibility, extreme pressure abrasion resistance and rust resistance, friction characteristic and anti-vibration performance. The invention relates to an automatic gearbox oil complexing agent which comprises, by mass, 0.6-1.5% of a detergent, 30-55% of a dispersing agent, 3-7% of an antioxidant, 3-9% of an extreme pressure antiwear agent, 5-10% of a