Friction Modifier Stabilization in Engine Oils

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Solution Overview

Problem

Friction modifiers derived from hydroxy-carboxylic acids face limitations due to solubility and compatibility issues in functional fluids like engine oils and gear oils, leading to instability and haziness, which restrict their use and performance in lubricants.

Innovation Solution

A composition that includes a friction modifier component, not fully soluble in the medium, combined with a stabilizing component that improves solubility, forming dispersed particles with an average diameter of less than 10 microns, allowing higher concentrations of friction modifiers while maintaining stability and clarity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If friction modifiers derived from hydroxy-carboxylic acids are used at higher levels to improve performance, then the performance and equipment protection are enhanced, but the composition becomes unstable and hazy due to solubility limitations

Engineering Contradiction:

Improveperformance and equipment protectionVSAvoidcompositional stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

A solubility-enhancing additive is introduced as an intermediary substance that facilitates the dissolution of friction modifiers in the functional fluid. This mediator overcomes the solubility barrier, allowing higher concentrations of friction modifiers to be used without causing instability or haziness, thus resolving the contradiction between performance enhancement and compositional stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The solubility characteristics of the friction modifier system are altered by changing chemical parameters - specifically by adding a solubility-enhancing additive that modifies the chemical environment. This parameter change enables higher friction modifier concentrations to remain soluble and stable, allowing performance improvement without sacrificing compositional stability.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If friction modifiers are used at higher concentrations to achieve greater performance, then fuel economy and viscosity stability improve, but the fluid becomes hazy and separates over time

Engineering Contradiction:

Improvefuel economy and viscosity stabilityVSAvoidhaziness and separation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The solubility-enhancing additive serves as a mediator that prevents the harmful effects of haziness and separation. It enables higher friction modifier concentrations to be used productively for improving fuel economy and viscosity stability, while simultaneously preventing the fluid from becoming hazy or separating over time.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The approach converts what would normally be harmful (high friction modifier concentrations causing haziness and separation) into beneficial outcomes. By using the solubility-enhancing additive, the system allows high concentrations of friction modifiers to be used productively without the adverse effects, turning a potential problem into a performance advantage.

Inventive Principle:

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

3Duration of action of stationary object

If maximum treat rates of friction modifiers are used to optimize performance, then equipment life is extended, but the additive package becomes incompatible and unstable

Engineering Contradiction:

Improveequipment lifeVSAvoidcompatibility

Core Design Contradiction:

Duration of action of stationary objectVSAdaptability or versatility

Solution Approach 1:

The solubility-enhancing additive acts as a compatibility mediator that enables maximum treat rates of friction modifiers to be used for extending equipment life. It ensures that even at maximum concentrations, the friction modifiers remain compatible with the base oil and other additives in the package, preventing instability while achieving optimal equipment protection.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution enables the use of higher amounts of friction modifiers in functional fluid compositions, enhancing performance and stability, as indicated by lower turbidity values and improved compatibility, preventing separation and haziness.

Implementation Method 1

Components (b) and (c) may be present in component (a) in the form of dispersed particles having an average diameter of less than 10 microns

Methodology Applied

Scientific EffectDispersion: Dispersion (of waves)

Data Source

PatentUS10190071B2Stabilized blends containing friction modifiers

Publication Date: 2019.01.29 THE LUBRIZOL CORP

AI summary

The present invention relates to functional fluid compositions containing friction modifiers, and specifically stable compositions containing friction modifiers with limited solubility in and/or limited compatibility with the functional fluids with which they are used. In particular the present invention deals with functional fluids used in internal combustion engines, such as engine oils, and friction modifiers derived from hydroxy-carboxylic acids, where the friction modifier is present in the functional fluid composition at levels that would otherwise cause the composition to be unstable and/or hazy.