Ashless Additive Composition for Lubricants
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Solution Overview
Problem
Conventional lubricating oil additives, particularly overbased metal detergents, contain ash which is subject to industry and regulatory restrictions, and basic amine additives can degrade fluoroelastomers used in seals, necessitating the development of ashless additives that are compatible with fluoroelastomeric seals while maintaining performance benefits like increased total base number, friction modification, and wear improvement.
Innovation Solution
The development of an ashless additive composition comprising a tertiary amine-containing compound or a diamide product of a hydrocarbyl-substituted succinic anhydride and a cyclic polyamine, which acts as a TBN source, friction modifier, and anti-wear agent, ensuring compatibility with fluoroelastomer seals and maintaining performance without ash-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional base-containing additives such as overbased phenate and sulfonate detergents are used to increase total base number, then sufficient basic additives are provided to neutralize acidic byproducts, but ash content increases which violates industry and regulatory standards
Solution Approach 1:
The invention changes the chemical composition parameters by using ashless base-containing additives (succinimide dispersants and polyol esters) instead of conventional overbased metal detergents. This substitution maintains the total base number functionality while eliminating sulfated ash content, directly resolving the contradiction between providing sufficient basic additives and meeting ash restriction standards.
2Loss of substance
If basic amine additives are used as an alternative to ash containing overbased metal detergents, then ash content is reduced, but fluoroelastomer seals are degraded due to dehydrofluorination caused by polyamine head-groups
Solution Approach 1:
The invention changes the chemical structure parameters by selecting specific ashless additives (succinimide dispersants and polyol esters) that lack the polyamine head-groups responsible for dehydrofluorination. This structural modification maintains ashless properties while eliminating seal degradation, resolving the contradiction between reducing ash and maintaining seal compatibility.
3Adaptability or versatility
If a single additive is designed to provide multiple functions (friction modifier, anti-wear, TBN source), then more than one performance benefit is achieved, but the complexity of finding a compatible additive that satisfies all requirements increases
Solution Approach 1:
The invention applies multi-functionality by designing ashless base-containing additives that simultaneously serve as TBN sources, friction modifiers, and wear protectants. The succinimide dispersants and polyol esters provide multiple performance benefits in a single additive package, reducing the number of separate additives needed while meeting diverse performance requirements.
Data Source
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AI summary
This disclosure describes an ashless lubricant additive. The additive is a tertiary amine-containing compound having the following structure: Formula (I); where R1 and R2 are independently a linear or branched-chain monovalent hydrocarbyl group having two to about twenty carbon atoms, each m is independently from 0 to 2, each p is independently from 0 to 2, for each cylic moiety m + p is from 2 to 4, and each n is independently from 1 to 6.