Sulfurized Catecholate Detergents for Engine Lubricants
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Solution Overview
Problem
Current lubricants face challenges in reducing thermal and mechanical stresses, leading to deposit formation on engine and driveline components, which affects performance and longevity, and there is a need for alternatives to branched para-C12-alkylphenols due to regulatory limitations.
Innovation Solution
A lubricating composition comprising sulfurized oxy-substituted aromatic polyols or their salts, which are reaction products of oxy-hydrocarbyl substituted catecholates with a sulfurizing agent and optionally a metal or pnictogen base, providing dispersancy and detergency while minimizing corrosion and seal compatibility issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If amine-based dispersants are used to neutralize acidic contaminants, then dispersancy is improved, but corrosion protection and seals compatibility deteriorate
Solution Approach 1:
The invention changes the chemical parameters of the detergent additive by using sulfurized catecholate structures instead of amine-based dispersants. This substitution maintains the ability to disperse contaminants while eliminating the harmful basic functionality that causes corrosion and seal incompatibility. The sulfurized aromatic polyol structure provides a fundamentally different chemical approach to achieving dispersancy without the adverse effects of amine-based systems.
2Reliability
If branched para-C12-alkylphenols are used as detergents, then detergency is improved, but regulatory compliance deteriorates
Solution Approach 1:
The invention changes the chemical structure parameters by replacing branched para-C12-alkylphenols with sulfurized catecholate structures. This structural transformation maintains effective detergency performance while ensuring compliance with regulatory restrictions on alkylphenol usage. The sulfurized aromatic polyol provides a chemically distinct alternative that achieves the same functional goals without violating environmental or safety regulations.
3Object-generated harmful factors
If thermal and mechanical stresses are reduced on lubricants, then deposit formation is reduced, but lubricant performance improvement is limited
Solution Approach 1:
The invention converts the harmful effect of thermal and mechanical stresses into a benefit by using these stresses to drive the sulfurization reaction of the catecholate structure. The sulfurized catecholate detergent additive is specifically designed to withstand and utilize these harsh conditions, transforming them into the desired sulfurized product that provides superior deposit control and cleanliness performance, thereby improving overall engine efficiency.
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 sulfurized oxy-substituted aromatic polyols or their salts effectively disperse contaminants, improve lubricant cleanliness, and provide antioxidancy, thereby enhancing engine efficiency and longevity while complying with regulatory standards by avoiding the use of restricted alkylphenols.
Implementation Method 1
Dispersants are used for dispersing impurities such as wear particles, soot and other contaminants
Implementation Method 2
Salicylate and catecholate additives have been used to provide desirable performance attributes to lubricant formulations, including cleanliness, antioxidancy, and dispersancy
Data Source
AI summary
A lubricating composition includes a sulfurized oxy-substituted aromatic polyol compound and an oil of lubricating viscosity. The sulfurized oxy-substituted aromatic polyol compound includes at least one of a sulfurized oxy-substituted aromatic polyol and a salt of a sulfurized oxy-substituted aromatic polyol. The compound is suitable as a replacement for detergents that contain Cn alkyl phenols derived from oligomers of propylene.