Engine Lubricant Composition for Friction Reduction and Lead Corrosion

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Solution Overview

Problem

Modern lubricants face challenges in achieving friction reduction while minimizing lead corrosion, as nitrogen-free organic friction modifiers that improve friction often increase lead corrosion, limiting formulation flexibility and compliance with industry standards.

Innovation Solution

A lubricating oil composition comprising a hydrocarbyl substituted succinimide dispersant, a nitrogen-free organic friction modifier with carboxylic acid and/or hydroxyl groups, and a boron-containing compound such as boric acid, which are admixed separately, reduces lead corrosion by optimizing the interaction between these components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If nitrogen-free organic friction modifier is added to reduce friction, then fuel economy is improved, but lead corrosion increases

Engineering Contradiction:

Improvefuel economyVSAvoidlead corrosion

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

A boron-containing compound is introduced as an intermediary substance that mediates between the nitrogen-free organic friction modifier and lead components. The boron compound reacts with the friction modifier to form a protective complex that reduces friction while preventing lead corrosion, thus resolving the harmful interaction between the friction modifier and lead

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention changes the chemical parameters of the lubricant composition by adding boron-containing compounds at specific concentrations (about 250-350 ppm boron per 1 wt% friction modifier). This parameter change transforms the chemical behavior of the friction modifier, enabling it to reduce friction without increasing lead corrosion

Inventive Principle:

Principle #35Parameter changes

2Reliability

If friction modifier treat rate is increased to improve friction reduction, then wear protection is enhanced, but lead corrosion increases proportionally

Engineering Contradiction:

Improvewear protectionVSAvoidlead corrosion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The boron-containing compound serves as a mediator that allows higher friction modifier concentrations to be used for improved wear protection without the proportional increase in lead corrosion. The boron forms protective complexes that decouple the relationship between friction modifier concentration and lead corrosion

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention converts the harmful effect of friction modifiers on lead into a beneficial protective mechanism. The boron-containing compound reacts with the friction modifier to create a protective layer that not only reduces friction and wear but also prevents lead corrosion, turning what was previously a harmful interaction into a protective one

Inventive Principle:

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

Data Source

PatentUS12529006B2Methods of reducing lead corrosion in an internal combustion engine

Publication Date: 2026.01.20 AFTON CHEMICAL CORPORATION

AI summary

The present disclosure describes lubricant compositions effective to reduce lead corrosion through an admixture of lubricant additives including at least a base oil of lubricating viscosity, a dispersant, a friction modifier, and boron-containing compound.