Lubricant Composition Viscosity Control for Engine Efficiency
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Solution Overview
Problem
Conventional lubricant compositions fail to simultaneously achieve energy-conserving performance, low-temperature viscosity characteristics, and high-temperature detergency, often resulting in issues like wear, seizure, and engine stop due to poor detergency and viscosity characteristics under severe conditions.
Innovation Solution
A lubricant composition comprising 50 to 99.9% of a lubricant base oil with specific kinematic viscosities and 0.1 to 50% of a viscosity index improver with a weight average molecular weight over 10000 and a PSSI ratio of 0.8×10^4, maintaining a 150°C HTHS viscosity ratio of 0.50 or higher, while reducing 40°C and 100°C kinematic viscosities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If base oil viscosity is reduced to improve energy-conserving performance and low-temperature viscosity characteristics, then 40°C and 100°C kinematic viscosity are reduced, but lubricating performance under severe high-temperature high-shear conditions deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the viscosity ratio parameter (150°C HTHS viscosity / 100°C HTHS viscosity ≥ 0.50) and base oil viscosity range (1-5 mm²/s at 100°C) to achieve optimal balance between energy conservation and lubricating performance under severe conditions
Solution Approach 2:
The patent uses composite materials by combining specific base oils with controlled viscosity characteristics and viscosity index improvers having specific molecular weight and PSSI ratios to create a multi-component lubricant composition that achieves both low viscosity at operating temperature and adequate film strength under severe conditions
2Use of energy by moving object
If viscosity index improver with high molecular weight is added to improve viscosity index and energy-conserving performance, then 100°C HTHS viscosity is reduced, but detergency under high-temperature low-lubricating conditions deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the viscosity index improver's molecular weight (≥10000) and PSSI ratio (≥0.8×10⁴) to achieve the right balance between viscosity modification capability and detergency performance
Solution Approach 2:
The patent applies local quality by using a blend of base oils with different viscosity characteristics (some with 1-5 mm²/s and others with 5-200 mm²/s at 100°C) to provide different functional properties in different regions of the operating temperature range
3Reliability
If 150°C HTHS viscosity is maintained at certain level to prevent wear and seizure, then energy-conserving performance is compromised, but lubricating performance under severe conditions is maintained
Solution Approach 1:
The patent applies parameter changes by controlling the viscosity ratio (150°C HTHS / 100°C HTHS ≥ 0.50) to ensure that the lubricant maintains adequate film strength at high temperature while having sufficiently low viscosity at operating temperature for energy efficiency
Data Source
AI summary
The lubricant base oil of the invention has excellent energy-conserving performance, low-temperature viscosity characteristics, and detergency. The composition contains: (A) a lubricant base oil composed of, based on the total base oil amount, 50 to 99.9 mass % of a lubricant base oil having a 100° C. kinematic viscosity of 1 to less than 5 mm2/s, and 0.1 to 50 mass % of a lubricant base oil having a 100° C. kinematic viscosity of 5 to 200 mm2/s, and (B) a viscosity index improver having average Mw of not less than 10000, and a Mw to PSSI ratio of not lower than 0.8×104, wherein the composition contains 0.1 to 50 mass % of component (B) based on the total composition amount, and has a 100° C. kinematic viscosity of 3 to 15 mm2/s and a 150° C. to 100° C. HTHS viscosity ratio of not less than 0.50.