Lubricating Composition Friction Modifier Viscosity Polymer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lubricating compositions for internal combustion engines face challenges in reducing phosphorus and sulfur emissions, replacing zinc dialkyldithiophosphate (ZDDP) while maintaining fuel economy and efficiency, and avoiding detrimental effects on engine performance.
Innovation Solution
A lubricating composition comprising an oil of lubricating viscosity with a friction modifier and a poly(meth)acrylate viscosity modifier polymer, along with specific additives to minimize phosphorus and sulfur content, enhance fuel economy, and provide antioxidant and anti-wear properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ZDDP antiwear additives are used to protect engine surfaces, then antiwear performance is improved, but fuel economy deteriorates and phosphorus emissions increase
Solution Approach 1:
The patent changes the chemical composition parameters by replacing ZDDP with alternative antiwear additives that have different phosphorus content and friction modification properties, thereby improving fuel economy while maintaining antiwear protection
Solution Approach 2:
The patent extracts ZDDP from the lubricant formulation to eliminate its detrimental impact on fuel economy and phosphorus emissions, while introducing alternative additives to maintain necessary protective functions
2Reliability
If ZDDP antiwear additives are used to protect engine surfaces, then antiwear performance is improved, but phosphorus emissions increase
Solution Approach 1:
The patent removes ZDDP and other phosphorus-containing additives from the lubricant formulation to eliminate the source of phosphorus emissions, while maintaining antiwear performance through alternative additive systems
Solution Approach 2:
The patent changes the additive composition to use alternatives with lower or zero phosphorus content, thereby reducing phosphorus emissions while maintaining necessary protective functions
3Reliability
If sulfur and phosphorus compounds are used in engine lubricants, then antiwear and friction modification properties are improved, but catalyst performance deteriorates due to poisoning
Solution Approach 1:
The patent extracts sulfur and phosphorus compounds from the lubricant formulation to prevent catalyst poisoning, while maintaining protective functions through alternative additive systems that are catalyst-compatible
Solution Approach 2:
The patent introduces alternative additives that serve as intermediaries to provide antiwear and friction modification protection without the harmful sulfur and phosphorus elements that poison catalysts
4Reliability
If friction modifier and ZDDP are both used in lubricants, then comprehensive protection is improved, but their adsorption functions interfere with each other
Solution Approach 1:
The patent removes ZDDP from the additive package to eliminate the harmful interaction between ZDDP and friction modifier adsorption, allowing the friction modifier to function optimally without interference
Solution Approach 2:
The patent changes the additive composition to use alternatives that do not compete for adsorption sites with friction modifiers, thereby maintaining comprehensive protection while reducing additive interaction complexity
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 composition effectively reduces phosphorus and sulfur emissions, improves fuel economy, and maintains engine performance without the detrimental effects associated with ZDDP, while providing antioxidant and anti-wear benefits.
Implementation Method 1
Both ZDDP and friction modifier function by adsorption on sliding surfaces
Implementation Method 2
a poly(meth)acrylate viscosity modifier polymer
Implementation Method 3
ZDDP antiwear additives protect the engine by forming a protective film on metal surfaces
Data Source
AI summary
A lubricant composition suitable for lubricating an internal combustion engine comprises: (a) an oil of lubricating viscosity having a viscosity index of at least 105 and a kinematic viscosity at 100 C of less than 7 mm2s-1; (b) 0.01 to 2 weight percent of a friction modifier represented by the structure [I]; (c) 0.5 to 4 weight percent of a poly(meth)acrylate viscosity modifier polymer; (d) 0 to 500 parts per million by weight of molybdenum in the form of an oil-soluble molybdenum compound; and (e) 0 to 200 parts per million by weight of boron in the form of an oil-soluble boron compound.