Comb Polymer Lubricant for Biodiesel Viscosity Loss
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Solution Overview
Problem
Lubricating compositions used in internal combustion engines fueled with biodiesel, particularly those containing fatty acid alkyl esters, experience undesirable viscosity loss due to dilution, which compromises their lubrication protection and fails to meet viscosity grade standards.
Innovation Solution
Incorporation of a comb polymer in the lubricating composition, comprising polyolefin-based macromonomers and low molecular weight monomers, to reduce viscosity loss when diluted with fatty acid alkyl esters like FAME, with specific formulations and concentrations optimizing the reduction in viscosity loss at 100°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lubricating composition is diluted with biodiesel (FAAE/FAME) to enable renewable fuel use, then the environmental sustainability is improved, but the viscosity of the lubricating composition decreases leading to loss of lubrication protection
Solution Approach 1:
The patent applies parameter changes by introducing a viscosity index improver polymer that modifies the viscosity-temperature relationship of the lubricating composition. The polymer changes the flow characteristics across different temperatures, ensuring that even when diluted with biodiesel, the lubricant maintains adequate viscosity at operating temperatures to provide proper lubrication protection.
Solution Approach 2:
The patent uses composite materials by combining the base lubricating oil with a specifically designed viscosity index improver polymer and biodiesel additives. This composite formulation creates a multi-component system where the polymer chains interact with the biodiesel components to maintain structural integrity and viscosity, resolving the contradiction between renewable fuel use and lubrication performance.
2Adaptability or versatility
If the lubricating composition is diluted with biodiesel (FAAE/FAME) to enable renewable fuel use, then the environmental sustainability is improved, but the lubrication protection is compromised
Solution Approach 1:
The viscosity index improver polymer modifies the rheological parameters of the lubricating composition, changing how viscosity responds to temperature and dilution. This parameter change ensures that the lubricant maintains sufficient film strength and lubrication protection even when blended with biodiesel, thereby preserving reliability while enabling environmental sustainability.
Solution Approach 2:
The viscosity index improver polymer acts as an intermediary substance that mediates between the biodiesel diluent and the base oil. It forms a protective network that maintains lubrication films and prevents direct harmful interactions between the biodiesel components and engine surfaces, thus preserving lubrication protection while allowing biodiesel use.
3Device complexity
If a conventional lubricating composition is used without viscosity index improver, then the formulation is simple, but the viscosity loss upon biodiesel dilution exceeds acceptable limits
Solution Approach 1:
The patent applies parameter changes by incorporating a viscosity index improver that fundamentally alters the viscosity behavior of the lubricating composition. This additive changes the flow properties and resistance to thinning, ensuring that even with biodiesel dilution, the viscosity remains within acceptable ranges for proper engine lubrication.
Solution Approach 2:
The viscosity index improver polymer provides local quality enhancement by concentrating its protective effect in the lubrication film region. The polymer chains adsorb onto metal surfaces and form protective layers, providing localized viscosity enhancement and lubrication protection where it is most needed, while the bulk formulation remains relatively simple.
Data Source
AI summary
Use of a comb polymer for reducing the loss in viscosity of a lubricating composition for the crankcase of an internal combustion engine, wherein the internal combustion engine is fuelled by a fuel composition comprising a fatty acid alkyl ester.