Lubricating Oil Composition for Low-Temperature Molybdenum Stability
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Solution Overview
Problem
Molybdenum compounds in lubricating oil compositions tend to precipitate under low temperature environments, leading to clogging and reduced friction-reducing effects, which negatively impact fuel consumption.
Innovation Solution
A lubricating oil composition comprising a molybdenum-based compound, a calcium detergent, a magnesium detergent, and an ester compound with 2 or more hydroxyl groups, balanced to inhibit molybdenum precipitation and enhance friction reduction at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a molybdenum compound is blended in a lubricating oil composition to reduce metal-to-metal friction coefficient, then the friction-reducing effect is improved in high temperature region, but the molybdenum compound precipitates under low temperature environment causing clogging and reduced effectiveness
Solution Approach 1:
The patent introduces a specific ester compound as an intermediary substance that mediates between the molybdenum compound and the low temperature environment. The ester compound with 2 or more hydroxyl groups acts as a solubilizing agent, preventing molybdenum precipitation by forming stable complexes or improving compatibility, thus maintaining both friction-reducing effect and low temperature stability simultaneously
Solution Approach 2:
The patent changes the chemical parameters of the lubricating oil composition by specifying precise content ranges for the ester compound (0.03 to 1.20 mass%) and controlling molybdenum content (0.03 to 0.12 mass%). By adjusting these compositional parameters, the patent resolves the contradiction between friction reduction and low temperature stability, enabling the molybdenum compound to remain soluble and effective across a wide temperature range
2Reliability
If the molybdenum compound precipitates under low temperature environment, then the friction-reducing effect is reduced, but adding more molybdenum compound to enhance friction reduction may worsen precipitation tendency
Solution Approach 1:
The ester compound serves as a protective intermediary that prevents the harmful interaction between molybdenum compound and low temperature conditions. By forming stable complexes or improving solubility, the ester compound allows higher molybdenum content to be added without increasing precipitation risk, thus enhancing friction reduction while preventing clogging
Solution Approach 2:
The patent creates a composite lubricating oil composition where the ester compound and molybdenum compound work synergistically. The specific combination of ester compound (0.03 to 1.20 mass%) and molybdenum compound (0.03 to 0.12 mass%) forms a stable composite system that maintains solubility and effectiveness, allowing maximum friction reduction without precipitation harm
Data Source
AI summary
A lubricating oil composition that hardly generates precipitation attributable to a molybdenum compound under the low temperature environment and is excellent in a friction-reducing effect under the low temperature environment is provided. The lubricating oil composition is one including (A) a lubricating base oil, (B) a molybdenum-based compound, (C) a metal-based detergent, and (D) an ester compound having one or more hydroxyl groups in a molecule thereof, wherein the metal-based detergent (C) includes (C1) a calcium detergent and (C2) a magnesium detergent, and a content of the ester compound (D) having one or more hydroxyl groups in a molecule thereof is 0.03 to 1.20 mass% on a basis of the total amount of the lubricating oil composition.