Lubricating Composition Reducing Adhesive Wear via Sulfur-Free Detergents
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Solution Overview
Problem
Current lubricants with lower high temperature high shear (HTHS) viscosities and reduced anti-wear additives, particularly phosphorous or sulfur-containing additives, face increased adhesive wear issues in internal combustion engines, necessitating a solution that maintains performance while minimizing environmental impact.
Innovation Solution
A lubricating composition comprising an oil of lubricating viscosity, metal-containing sulfur-free detergents derived from alkylphenol, alkaline earth metal sulfonate detergents, polyisobutenyl succinimide dispersants, and a dispersant viscosity modifier, with specific weight percentages to reduce adhesive wear without exceeding 0.2 wt% sulfur-coupled phenate detergent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the HTHS viscosity of the lubricant is reduced to improve fuel economy, then fuel economy is improved, but adhesive wear increases
Solution Approach 1:
The patent changes the chemical composition parameters of the lubricant by incorporating specific anti-wear additives (zinc dialkyldithiophosphate at 0.01-2.0 wt%, sulfurized olefin at 0.01-1.0 wt%) and adjusting the base oil viscosity characteristics. This allows the lubricant to maintain lower HTHS viscosity for improved fuel economy while the chemical additives provide adequate adhesive wear protection through boundary lubrication mechanisms.
Solution Approach 2:
The patent creates a composite lubricating system by combining multiple functional components: base oil (providing bulk lubrication), zinc dialkyldithiophosphate (providing anti-wear film formation), sulfurized olefin (providing extreme pressure protection), and other additives. This composite approach enables the lubricant to achieve both low viscosity for fuel economy and sufficient wear protection through the synergistic action of different materials.
2Object-affected harmful factors
If the level of phosphorous or sulfur-containing anti-wear additives is reduced for environmental reasons, then environmental impact is reduced, but adhesive wear protection decreases
Solution Approach 1:
The patent adjusts the concentration parameters of specific anti-wear additives within optimized ranges (zinc dialkyldithiophosphate at 0.01-2.0 wt%, sulfurized olefin at 0.01-1.0 wt%) to achieve adequate wear protection with minimal environmental impact. The formulation maintains low phosphorous and sulfur content while using alternative additive chemistry that provides equivalent or superior wear protection through different mechanisms.
Solution Approach 2:
The patent employs alternative anti-wear additives that may have shorter operational lifetimes or different degradation pathways compared to traditional phosphorous or sulfur-based additives. The zinc dialkyldithiophosphate and sulfurized olefin combination provides wear protection through mechanisms that are environmentally benign, breaking down into non-harmful substances, thus replacing the need for persistent phosphorous or sulfur additives.
Data Source
AI summary
The disclosed technology provides a lubricating composition and a method of lubricating an internal combustion engine where the lubricating composition contains an oil of lubricating viscosity, one or more metal-containing, sulfur-free, alkyl-phenol based detergents, an alkaline earth metal sulfonate detergent, a polyisobutenyl succinimide dispersant, and a dispersant viscosity modifier having a number average molecular weight of at least 20,000.The lubricating composition of the present invention can be formulated to have lower HTHS viscosity, and reduced phosphorous content, while providing protection against adhesive wear.