Low-Zinc Engine Oil Composition for Ash and Catalyst Protection
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Solution Overview
Problem
Existing lubricants for internal combustion engines face challenges in reducing sulfated ash and phosphorus content to comply with emission regulations, as zinc dialkyldithiophosphates (ZDDP) contribute to increased sulfated ash and inactivate oxidation catalysts, necessitating the development of alternative additives for wear and oxidation protection.
Innovation Solution
A lubricating composition containing a 2,5-dimercapto-1,3,4-thiadiazole (DMTD) derivative additive, derived from the reaction product of DMTD and an α, β-unsaturated carbonyl compound, is used to provide deposit and oxidation control in internal combustion engines, replacing traditional metal-containing additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zinc dialkyldithiophosphates (ZDDP) are used for wear and oxidation protection, then wear protection is improved, but sulfated ash content increases
Solution Approach 1:
The patent changes the chemical composition parameters by replacing ZDDP with DMTD derivative additives that have different elemental composition (low or zero zinc and phosphorus content), thereby reducing sulfated ash while maintaining protective functions
Solution Approach 2:
The patent extracts and removes the harmful zinc and phosphorus elements from the lubricant composition by replacing ZDDP with DMTD derivatives, eliminating the source of sulfated ash and catalyst inactivation while retaining wear protection capabilities
2Reliability
If zinc dialkyldithiophosphates (ZDDP) are used for wear and oxidation protection, then wear protection is improved, but phosphorus content increases
Solution Approach 1:
The patent extracts and removes phosphorus from the lubricant composition by replacing ZDDP with DMTD derivatives that contain no phosphorus, thereby eliminating catalyst inactivation while maintaining wear protection
Solution Approach 2:
The patent changes the chemical composition by substituting phosphorus-containing ZDDP with phosphorus-free DMTD derivatives, altering the elemental profile to meet emission standards while preserving functional performance
3Quantity of substance
If metal-containing additives are reduced to meet emission standards, then sulfated ash and phosphorus content are reduced, but wear and oxidation protection may be compromised
Solution Approach 1:
The patent employs DMTD derivatives as effective alternative additives that provide necessary wear and oxidation protection with minimal or no metal content, allowing compliance with emission standards while maintaining engine protection
Solution Approach 2:
The patent changes the additive chemistry from metal-based (ZDDP) to organic-based (DMTD derivatives), fundamentally altering how wear protection is achieved without relying on metal ash-forming compounds
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 DMTD derivative additive effectively reduces sulfated ash and phosphorus content, enhancing engine performance by minimizing catalyst inactivation and reducing emissions, while maintaining wear protection.
Implementation Method 1
The invention further provides a method of decomposing peroxide in a lubricating composition when used to lubricate an internal combustion engine
Data Source
AI summary
The disclosed technology relates to lubricants for compression ignition internal combustion engines, particularly those demonstrating at least one of improved seals performance, reduced deposit formation, and excellent durability. The present invention provides a low zinc lubricating composition comprising (a) an oil of lubricating viscosity, (b) a borated dispersant, and (c) a metal-free organo-phosphorus anti-wear additive, wherein the lubricating composition is substantially free of a metal containing sulfur coupled alkyl phenol compound. Further, the low zinc lubricating composition contains zinc in an amount less than 600 ppm by weight of the composition.