Sulfonate Detergent Composition for Diesel Piston Cleanliness
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Solution Overview
Problem
Existing lubricant formulations struggle to meet the stringent piston cleanliness requirements of modern diesel engines, particularly under the more severe conditions of the CEC L-117-20 (VW TDi3) test, while maintaining other performance characteristics, due to the limitations of using phenate detergents and the formulation trade-offs associated with combining phenate and sulfonate detergents.
Innovation Solution
A lubricating composition comprising a detergent system with a total base number (TBN) of 3 to 15 mg KOH/g, primarily consisting of sulfonate soaps, with a soap content of 75 wt.-percent or more sulfonate and 25 wt.-percent or less phenate, and optionally including neutral, low-based, or overbased sulfonate detergents, achieves piston cleanliness in the CEC L-117-20 (VW TDi3) test without phenate soaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If phenate and sulfonate detergents are combined to achieve piston cleanliness, then piston cleanliness is improved, but formulation flexibility is limited and other performance characteristics are compromised
Solution Approach 1:
The patent extracts phenate detergent from the formulation entirely, relying solely on sulfonate detergent to achieve piston cleanliness. This eliminates the need for detergent combinations and restores formulation flexibility while meeting the CEC L-117-20 piston cleanliness requirements.
Solution Approach 2:
The patent changes the detergent composition parameters by specifying a sulfonate detergent with minimum 75 wt.% sulfonate soap content and minimum TBN of 3 mg KOH/g. This parameter specification allows single-detergent formulations to achieve previously unattainable piston cleanliness levels without compromising other performance characteristics.
2Manufacturing precision
If phenate and sulfonate detergents are combined to meet piston cleanliness standards, then piston cleanliness is improved, but formulation complexity increases
Solution Approach 1:
The patent removes phenate detergent from the formulation, simplifying the detergent system from a multi-component mixture to a single sulfonate detergent system. This extraction reduces formulation complexity while maintaining or improving piston cleanliness performance.
Solution Approach 2:
Instead of using multiple detergents to achieve cleanliness (the conventional approach), the patent inverts the approach by using a single simplified detergent system with optimized parameters (minimum 75 wt.% sulfonate content and minimum TBN of 3) to achieve superior piston cleanliness.
3Manufacturing precision
If detergent combinations are used to achieve piston cleanliness, then cleaning performance is improved, but selection of supplementary components is limited
Solution Approach 1:
The patent extracts the constraint of requiring detergent combinations, allowing manufacturers to freely select supplementary components without being limited by compatibility requirements with phenate detergents. The simplified sulfonate-only system eliminates these formulation constraints.
Solution Approach 2:
The sulfonate detergent system performs multiple functions: it provides piston cleanliness, maintains TBN levels, and allows flexibility in selecting supplementary components. This universal approach replaces the need for multiple specialized detergents and their associated compatibility constraints.
Data Source
AI summary
The present disclosure relates to lubricating compositions achieving piston cleanliness pursuant to CEC L-117-20 (VW TDi3) that fail to achieve desired piston cleanliness pursuant to CEC L-078-99 (VW TDi2).