Protected Mercaptophenol Lubricant Additives for Deposit Control
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Solution Overview
Problem
Current lubricant additives, such as amine-based dispersants and alkylphenols, face challenges in providing effective corrosion protection and compatibility while reducing deposit formation in engines, and there is a need for alternatives due to regulatory limitations on certain alkylphenols.
Innovation Solution
Development of a lubricating composition containing a protected mercaptophenol, formed by reacting a mercaptophenol with an oxirane, which serves as a dispersant or detergent, offering improved performance and compatibility without the limitations of traditional alkylphenols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
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 patent changes the chemical parameters of the dispersant from amine-based to phenolic-based compounds (specifically protected mercaptophenols with hydroxy-substituted hydrocarbyl groups). This parameter change allows the dispersant to maintain dispersancy while improving corrosion protection and seals compatibility, as phenolic compounds are less aggressive towards metal surfaces and seals compared to amine-based dispersants.
2Reliability
If alkylphenols are used as detergents, then detergent performance is improved, but regulatory compliance deteriorates due to limits on PDDP
Solution Approach 1:
The patent changes the chemical structure parameters of the detergent from traditional alkylphenols (specifically PDDP which is restricted) to protected mercaptophenols with hydroxy-substituted hydrocarbyl groups. This structural modification maintains the detergent's ability to prevent deposit formation while ensuring compliance with regulatory limits on PDDP and other restricted alkylphenols.
Solution Approach 2:
The patent employs a composite molecular structure combining the mercaptophenol core with hydroxy-substituted hydrocarbyl groups. This composite structure integrates the detergent functionality of the phenolic core with the regulatory compliance and performance benefits of the hydroxy-substituted hydrocarbyl substituents, creating a detergent that meets both performance and regulatory requirements.
3Reliability
If traditional lubricant additives are used to protect against wear and oxidation, then component protection is improved, but deposit formation increases
Solution Approach 1:
The patent changes the chemical parameters of the lubricant additives from conventional formulations to protected mercaptophenols with hydroxy-substituted hydrocarbyl groups. This parameter change enables the additives to provide effective protection against wear and oxidation through the phenolic and mercaptan functional groups, while the hydroxy-substituted hydrocarbyl groups prevent excessive deposit formation by maintaining better oil solubility and cleanliness.
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 protected mercaptophenol composition effectively reduces deposit formation and enhances lubricant performance by providing corrosion protection and improved compatibility, addressing the limitations of existing additives while meeting regulatory requirements.
Implementation Method 1
a compound comprising a protected mercaptophenol, formed by reacting a mercaptophenol with an oxirane
Data Source
AI summary
A lubricating composition includes an oil of lubricating viscosity and a compound comprising a protected mercaptophenol. The protected mercaptophenol includes a mercapto group in which the hydrogen is substituted with a substituent of at least 5 carbons. The substituent is selected from hydroxy-substituted hydrocarbyl groups, poly(ether) groups, hydrocarbyl groups, and mixtures and salts thereof.