Ashless Friction Modifiers for Engine Lubricants

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Solution Overview

Problem

Current engine lubricants containing phosphorus and sulfur compounds, such as ZDDP, contribute to particulate emissions and catalyst poisoning, and can negatively impact fuel economy and corrosion, necessitating the development of ashless additives that provide equivalent or superior friction, antiwear, and antioxidant performance without increasing metal corrosion.

Innovation Solution

A lubricating composition incorporating α-hydroxyketones with hydroxyl groups or ether linkages attached to the carbon atom adjacent to the carbonyl carbon, which serve as friction modifiers, antiwear agents, antioxidants, and corrosion inhibitors, reducing corrosiveness and improving fuel economy while minimizing metal corrosion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If phosphorus and sulfur compounds such as ZDDP are used as antiwear additives, then antiwear performance is improved, but fuel economy deteriorates and catalyst performance is reduced

Engineering Contradiction:

Improveantiwear performanceVSAvoidfuel economy

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent changes the chemical composition parameters by replacing phosphorus and sulfur compounds with ashless organic compounds containing nitrogen and/or metal complexes, fundamentally altering the additive chemistry to eliminate harmful emissions while maintaining protective functions

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the harmful ash-forming characteristic of traditional antiwear additives into a benefit by using ashless compounds that provide equivalent protection without forming particulate emissions, thereby eliminating catalyst poisoning while maintaining antiwear performance

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Reliability

If phosphorus and sulfur compounds such as ZDDP are used as antiwear additives, then antiwear performance is improved, but catalyst performance deteriorates

Engineering Contradiction:

Improveantiwear performanceVSAvoidcatalyst poisoning

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent eliminates the harmful sulfur and phosphorus content that causes catalyst poisoning by substituting these compounds with ashless organic compounds, thereby removing the source of catalyst deactivation while preserving antiwear protection

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent fundamentally changes the chemical composition by replacing traditional ZDDP-based additives with nitrogen-containing and metal complex-based ashless compounds, altering the emission characteristics to be ash-free and catalyst-friendly

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If ashless friction modifiers are used to improve fuel economy, then fuel economy is improved, but metal corrosion increases

Engineering Contradiction:

Improvefuel economyVSAvoidmetal corrosion

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent introduces corrosion inhibitors as intermediary substances that mediate between the ashless friction modifier and the metal surfaces, preventing direct corrosive interaction while maintaining the low-ash benefits of the friction modifier

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite additive package combining ashless friction modifiers with corrosion inhibitors and other protective additives, achieving a synergistic effect that provides both fuel economy improvements and corrosion protection

Inventive Principle:

Principle #40Composite materials

4Object-affected harmful factors

If ZDDP is used to protect engine components, then corrosion inhibition is improved, but particulate emissions increase

Engineering Contradiction:

Improvecorrosion inhibitionVSAvoidparticulate emissions

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical composition from phosphorus and sulfur-based compounds to ashless organic compounds, fundamentally altering the emission profile to eliminate sulfated ash and particulate emissions while maintaining corrosion protection through alternative mechanisms

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10590363B2Ashless-friction modifiers for lubricating compositions

Publication Date: 2020.03.17 THE LUBRIZOL CORP

AI summary

The invention provides a lubricating composition containing an oil of lubricating viscosity and an ashless ketone compound with at least one of a hydroxy group and an ether linkage attached to the carbon atom adjacent to the carbonyl carbon of the ketone, especially α-hydroxyketone. The invention further relates to methods of lubricating an internal combustion engine by supplying the described lubricating composition to the internal combustion engine. The invention further relates to the use of the α-hydroxyketone compound as a friction modifier and an antiwear agent.