Lubricant Composition for Engine Fuel Efficiency
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Solution Overview
Problem
Conventional lubricating base oils and viscosity index improvers fail to achieve a high balance of viscosity-temperature characteristic, low-temperature viscosity characteristic, and antiwear property, particularly in SAE10 class lubricating base oils, leading to insufficient fuel efficiency and reduced long-term reliability.
Innovation Solution
A lubricating oil composition comprising a lubricating base oil with a urea adduct value not greater than 4% and a viscosity index of 100 or higher, obtained through hydrocracking/hydroisomerization of normal paraffin-containing feed stock oil, combined with a poly(meth)acrylate with a weight-average molecular weight of 200,000-400,000, which improves viscosity-temperature and low-temperature viscosity characteristics while enhancing antiwear properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional lubricating base oils and viscosity index improvers are used, then high-temperature fuel efficiency can be improved by reducing viscosity, but antiwear property and long-term reliability deteriorate
Solution Approach 1:
The invention changes the chemical parameters of the base oil by controlling the urea adduct value to not greater than 4% and viscosity index to 100 or higher through specific hydrocracking/hydroisomerization processes. This allows achieving both low viscosity for fuel efficiency and sufficient antiwear property through optimized molecular structure rather than simply reducing viscosity
Solution Approach 2:
The invention uses a composite approach by combining a specially processed lubricating base oil with specific poly(meth)acrylate additives having controlled molecular weights (200,000-400,000). This composite system achieves both low viscosity for fuel efficiency and protective antiwear properties through the synergistic effect of the base oil and additives
2Loss of energy
If viscosity is reduced to improve fuel efficiency, then high-temperature fuel efficiency improves, but antiwear property and long-term reliability deteriorate
Solution Approach 1:
The invention optimizes the base oil parameters (urea adduct value ≤4%, viscosity index ≥100) to achieve the right balance between viscosity for energy efficiency and molecular structure for reliability, rather than simply reducing viscosity
3Stability of the object's composition
If SAE10 class lubricating base oils are used, then viscosity-temperature characteristic can be improved, but low-temperature viscosity characteristic and antiwear property cannot be maintained at high levels simultaneously
Solution Approach 1:
The invention combines SAE10 class base oil with specifically selected poly(meth)acrylate additives (weight-average molecular weight 200,000-400,000) to achieve a composite system that simultaneously provides good viscosity-temperature characteristic and improved low-temperature viscosity characteristic and antiwear property
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The lubricating oil composition achieves a high-level balance of viscosity-temperature and low-temperature viscosity characteristics, improving fuel efficiency and antiwear properties, ensuring effective lubrication and reliability.
Implementation Method 1
a first step in which a normal paraffin-containing feed stock oil is subjected to hydrotreatment using a hydrocracking catalyst
Implementation Method 2
the treated product from the first step is subjected to hydrodewaxin using a hydrodewaxing catalyst
Implementation Method 3
The lubricating base oil in the lubricating oil composition, having a urea adduct value and viscosity index that satisfy the conditions specified above, exhibits an excellent viscosity-temperature characteristic and low-temperature viscosity characteristic, while also having lower viscous resistance or stirring resistance and improved heat and oxidation stability, frictional properties and antiwear property
Implementation Method 4
a poly(meth)acrylate with a weight-average molecular weight of 200,000-400,000, which improves viscosity-temperature and low-temperature viscosity characteristics
Implementation Method 5
improved heat and oxidation stability
Implementation Method 6
improved heat and oxidation stability
Data Source
AI summary
The present invention relates to a lubricating oil composition for an internal combustion engine, comprising a lubricating base oil having a urea adduct value of not greater than 4 % by mass and a viscosity index of 100 or higher, and a poly(meth)acrylate having a weight-average molecular weight of 200,000-400,000.