Alkyl-Substituted Quinoline Grease Dispersion Method

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Solution Overview

Problem

Alkyl-substituted quinolines, commonly used as antioxidants in lubricating compositions like greases, pose challenges due to their brittle solid form at room temperature and high viscosity at typical additive temperatures, leading to poor dispersion and potential filter blockages, along with safety concerns when added at high temperatures.

Innovation Solution

A method involving dissolving alkyl-substituted quinolines in a polyalkylene glycol solvent, allowing their addition to a base oil composition at temperatures below 150°C, providing a stable and flexible process for incorporation into greases.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If alkyl-substituted quinolines are added to grease at typical additive temperatures (80-100°C), then the addition process is simple, but the antioxidant does not disperse properly and causes filter blockages

Engineering Contradiction:

Improveaddition process simplicityVSAvoiddispersion quality

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent changes the temperature parameter from typical additive temperatures (80-100°C) to elevated temperatures (150-160°C) to improve the dispersion quality of alkyl-substituted quinolines in grease, resolving the contradiction between ease of operation and reliability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies preliminary heating to the grease base stock before adding the antioxidant, softening the brittle solid material to enable proper dispersion. This preliminary thermal preparation prevents filter blockages while maintaining operational simplicity

Inventive Principle:

Principle #10Preliminary action

2Reliability

If alkyl-substituted quinolines are added at high temperatures (150-160°C), then proper dispersion is achieved, but health and safety risks increase due to grease temperature and fume generation

Engineering Contradiction:

Improvedispersion qualityVSAvoidhealth and safety risks

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent rapidly heats the grease to the required temperature (150-160°C), performs the additive addition quickly, and then proceeds to cooling and packaging. This rushed-through approach minimizes the time the system spends at high temperatures, reducing health and safety risks while maintaining dispersion quality

Inventive Principle:

Principle #21Skipping (Rushing through)

3Object-affected harmful factors

If alkyl-substituted quinolines are added after a cooling phase, then safety risks are reduced, but the window of opportunity for proper dispersion becomes narrow

Engineering Contradiction:

Improvesafety risksVSAvoidaddition timing flexibility

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The patent performs preliminary heating of the grease base stock to the optimal temperature range (150-160°C) before adding the antioxidant. This preliminary thermal preparation creates a favorable temperature window that allows for safe yet effective dispersion, balancing safety risks and timing flexibility

Inventive Principle:

Principle #10Preliminary action

4Object-affected harmful factors

If alkyl-substituted quinolines are added at lower temperatures, then safety risks are reduced and flexibility is improved, but proper dispersion cannot be achieved with the material in solid form

Engineering Contradiction:

Improvesafety risksVSAvoiddispersion quality

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent changes the temperature parameter to an optimal range (150-160°C) that is low enough to maintain safety and flexibility but high enough to enable proper dispersion of the antioxidant. This parameter optimization resolves the contradiction between safety risks and dispersion quality

Inventive Principle:

Principle #35Parameter changes

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

Enables proper dispersion of alkyl-substituted quinolines at lower temperatures, reducing safety risks and offering more flexibility in addition timing, resulting in a stable grease with maintained properties and preventing filter blockages.

Implementation Method 1

providing a solution of one or more alkyl-substituted quinolines in a solvent... if the alkyl-substituted quinolines (or oligomeric derivatives thereof) are added in a solvent to the base oil composition, they can be added at a lower temperature, whilst still obtaining a proper dispersing thereof in the base oil composition

Methodology Applied

Scientific EffectDissolution: Solvation

Data Source

PatentEP2242823B1Method for preparing a grease composition

Publication Date: 2013.03.13 SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ BV

AI summary

The present invention provides a method for preparing a lubricating composition, in particular a grease, the method at least comprising the steps of : a) providing a base oil composition optionally containing one or more additives; b) providing a solution of one or more alkyl- substituted quinolines or oligomeric derivatives thereof in a solvent; and c) adding the solution of step b) to the base oil composition of step a) at a temperature below 150°C.