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KR-102963510-B1 - LUBRICATING COMPOSITIONS FOR REDUCED LOW TEMPERATURE VALVE TRAIN WEAR

KR102963510B1KR 102963510 B1KR102963510 B1KR 102963510B1KR-102963510-B1

Abstract

The present disclosure relates to a lubricating composition comprising an effective amount of magnesium boost and molybdenum from an oil-soluble molybdenum compound in a detergent system for achieving acceptable motor friction and valve train wear performance.

Inventors

  • 사무엘 브루스 필드
  • 케니스 개레릭
  • 히데타카 호시노
  • 기욤 카펜티어

Assignees

  • 에프톤 케미칼 코포레이션

Dates

Publication Date
20260511
Application Date
20231026
Priority Date
20221028

Claims (15)

  1. As an engine lubricant composition providing improved low-temperature valve train wear according to the sequence IVB engine test of ASTM D8350, One or more base oils of lubricating viscosity; 300 to 1000 ppm of molybdenum from an oil-soluble molybdenum compound; One or more metal-containing detergents providing more than 5 TBN to the above lubricating oil composition—said TBN is measured using ASTM D4739, and At least one of the above one or more metal-containing detergents comprises a perbasic magnesium detergent that provides more than 2 TBN to the lubricating oil composition, said TBN measured using ASTM D4739 -; and Contains less than 0.2 weight% of a polymer pour point depressant; The above engine lubricating oil composition is an engine lubricating oil composition having a viscosity grade according to SAE J 300 of 0W-8, 0W-12, 0W-16, or 0W-20.
  2. The engine lubricating oil composition according to claim 1, wherein one or more perbasic magnesium-containing detergents comprise magnesium sulfonate.
  3. The engine lubricating oil composition according to claim 1, wherein the lubricating oil composition further comprises a calcium-containing detergent.
  4. An engine lubricating oil composition according to claim 1, wherein one or more perbasic magnesium-containing detergents have a total base number (TBN) of at least 250 mg KOH/g.
  5. An engine lubricant composition according to claim 1, wherein the polymer pour point depressant is a poly(meth)acrylate-based pour point depressant.
  6. An engine lubricating oil composition according to claim 5, wherein the polymer pour point depressant is a poly(meth)acrylate copolymer having one or more monomer units selected from C1 to C16 (meth)acrylates and (2) monomer units including vinylpyrrolidone monomer units.
  7. In claim 5, the engine lubricant composition comprises less than 0.1 weight% of a poly(meth)acrylate-based pour point depressant.
  8. In claim 1, the lubricating oil composition is an engine lubricating oil composition for lubricating a hybrid gasoline-electric engine.
  9. In claim 8, the engine lubricating oil composition comprises a gasoline engine of 2.0 liters or less, wherein the hybrid gasoline electric engine comprises the same.
  10. The engine lubricant composition of claim 1, wherein the lubricant composition exhibits an average intake lifter volume loss of 2.7 mm³ or less and a maximum end-of-test iron content of 400 ppm or less when measured according to the sequence IVB engine test of ASTM D8350.
  11. As a method for lubricating a hybrid gasoline-electric engine to achieve improved low-temperature valve train wear according to the sequence IVB engine test of ASTM D8350, The method comprises the step of lubricating a hybrid electric-gasoline engine with a lubricating oil composition having a viscosity grade according to SAE J 300 of 0W-8, 0W-12, 0W-16, or 0W-20; A method comprising: one or more base oils of lubricating viscosity; 300 to 1000 ppm of molybdenum from an oil-soluble molybdenum compound; one or more metal-containing detergents providing more than 5 TBN to the lubricating oil composition—wherein the TBN is measured using ASTM D4739, and at least one of the one or more metal-containing detergents comprises a perbasic magnesium detergent providing more than 2 TBN to the lubricating oil composition, wherein the TBN is measured using ASTM D4739—; and less than 0.2 wt% of a polymeric pour point depressant.
  12. In claim 11, the method wherein one or more perbasic magnesium-containing detergents comprise magnesium sulfonate and/or the lubricating oil composition further comprises a calcium-containing detergent.
  13. In claim 11, the method wherein one or more perbasic magnesium-containing detergents have a total base number (TBN) of at least 250 mg KOH/g or 40% to 100% of the detergent TBN is provided by perbasic magnesium sulfonate.
  14. A method according to claim 11, wherein the polymer pour point depressant is a poly(meth)acrylate-based pour point depressant; and the polymer pour point depressant is a poly(meth)acrylate copolymer having monomer units comprising (i) one or more monomer units selected from C1 to C16 (meth)acrylates and (ii) vinylpyrrolidone monomer units.
  15. In claim 11, the method wherein the hybrid gasoline-electric engine comprises a gasoline engine of 2.0 liters or less and/or the lubricating oil composition exhibits an average intake lifter volume loss of 2.7 mm³ or less and a maximum test-end iron content of 400 ppm or less when measured according to the sequence IVB engine test of ASTM D8350.

Description

Lubricating compositions for reduced low-temperature valve train wear The present disclosure relates to a lubricating composition and, in particular, a lubricating composition that provides improved low-temperature valve train wear. As automotive manufacturers face continuous pressure for improved efficiency, fluid life, and fuel economy, the demands on engines, lubricants, and their components continue to increase. Today's engines are often smaller, lighter, and more efficient due to technologies designed to improve fuel economy, performance, and power. These requirements also mean that engine oil performance must evolve to meet the higher demands of such modern engines and the corresponding performance standards associated with their unique uses and applications. Driven by such demanding requirements for engine oils, lubricant manufacturers often tailor their lubricants and additives to meet specific performance requirements for industrial and/or manufacturer applications. Typically, because industry standards and/or automotive manufacturers require specific performance, a lubricant designed for a single use or application may not meet all specifications for different uses or applications. Modern automotive and/or industry standards place increasingly stringent requirements on the composition and performance of such oils, often leaving little room for flexibility in lubricant formulations. For example, the Society of Automotive Engineers (SAE) or the Japanese Automobile Standards Organization (JASO) have established performance standards for lubricants intended for use in a wide range of applications. One of the goals of lubricant development is to help improve fuel efficiency by reducing friction losses, which is often pursued by designing lubricants with lower viscosity. However, as lubricant manufacturers strive to meet stricter industry standards, it becomes difficult to cost-effectively achieve both the required performance and automotive industry standards simultaneously. In many situations, the various components within a lubricant composition designed to satisfy newer performance characteristics tend to negatively affect one or more other performance characteristics. Consequently, it has become challenging for lubricant manufacturers to meet newer industrial performance demands while simultaneously maintaining traditional fluid performance. For example, molybdenum-based compounds are widely used as friction modifiers and, in some cases, help achieve performance acceptance in motor friction tests, such as the JASO M 365 motor friction test of the JASO GLV-1 specification. However, when formulating low-viscosity grade lubricants such as 0W-8, 0W-12, 0W-16, or 0W-20 lubricants with a amount of molybdenum to achieve motor friction performance acceptance, it becomes difficult to achieve performance acceptance in the ASTM D8350 Sequence IVB engine test, which evaluates the effect of the lubricant on tappet wear in engines with a direct-drive overhead cam valve train. The present invention relates to a lubricating composition for an engine oil composition that provides improved low-temperature valve train wear according to the sequence IVB engine test of ASTM D8350. In one embodiment, the engine lubricating composition comprises one or more base oils of lubricating viscosity, molybdenum of about 300 to about 1000 ppm from an oil-soluble molybdenum compound, one or more metal-containing detergents that provide more than about 5 TBN to the lubricating composition (wherein TBN is measured using ASTM D4739), and at least one of the one or more metal-containing detergents comprises a perbasic magnesium detergent that provides more than about 2 TBN to the lubricating composition (wherein TBN is measured using ASTM D4739). In an embodiment, the engine lubricating oil composition may also contain less than about 0.2 weight percent of a polymer pour point depressant, and the engine oil composition has a viscosity grade according to SAE J 300 of 0W-8, 0W-12, 0W-16, or 0W-20. In other embodiments or approaches, the lubricating composition of the preceding paragraph may include optional features or embodiments in any combination. Such optional features or embodiments may include one or more of the following: one or more perbasic magnesium-containing detergents comprise magnesium sulfonate; the lubricating composition further comprises a calcium-containing detergent; one or more perbasic magnesium-containing detergents have a total number of bases (TBN) of at least about 250 mg KOH/g; the polymeric pour point depressant is a poly(meth)acrylate-based pour point depressant; the polymeric pour point depressant is a poly(meth)acrylate copolymer having monomer units comprising (i) one or more monomer units selected from C1 to C16 (meth)acrylates and (2) vinylpyrrolidone monomer units; the engine lubricating composition is substantially free of poly(meth)acrylate-based dispersible pour point depressants; the lubricating co