Lubricating Oil Composition for Corrosion-Resistant Additive Compatibility

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Solution Overview

Problem

Antioxidants are not fully compatible with alkylhydroxybenzoate detergents, leading to reduced corrosion resistance in lubricants.

Innovation Solution

A lubricating oil composition comprising an alkylhydroxybenzoate detergent derived from isomerized normal alpha olefins, combined with a molybdenum-containing antioxidant and diphenylamine, where molybdenum is present at 120 ppm and diphenylamine at 0.5 wt. % or more, enhancing corrosion resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If antioxidant(s) and alkylhydroxybenzoate detergent(s) are combined, then lubricant performance benefits are achieved (extending drain interval, maintaining viscosity, reducing deposit), but corrosion resistance is negatively impacted

Engineering Contradiction:

Improvelubricant performance stabilityVSAvoidcorrosion resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a specific combination of antioxidants (molybdenum-containing antioxidant and diphenylamine) that act as intermediaries to mediate between the alkylhydroxybenzoate detergent and the metal surfaces. This specific antioxidant combination prevents the harmful interaction between the detergent and metal, thereby maintaining corrosion resistance while still providing the benefits of the detergent package.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the chemical parameters of the antioxidant system by specifying precise concentrations (molybdenum at 120 ppm and diphenylamine at 0.5 wt.% or more). This parameter optimization ensures that the antioxidant system effectively counteracts the corrosive effects of the alkylhydroxybenzoate detergent while maintaining overall lubricant performance.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If alkylhydroxybenzoate detergent is used, then deposit reduction and viscosity maintenance are improved, but compatibility with antioxidants is reduced

Engineering Contradiction:

Improvedeposit control and viscosity stabilityVSAvoidadditive compatibility

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent merges the alkylhydroxybenzoate detergent with a specific antioxidant system (molybdenum-containing antioxidant and diphenylamine) to create a compatible additive package. This combination allows the detergent to provide deposit control and viscosity stability while the specific antioxidant system ensures chemical compatibility and prevents detrimental interactions.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a composite additive system combining alkylhydroxybenzoate detergent with specific antioxidants. This composite approach ensures that all components work synergistically, maintaining deposit control and viscosity stability while achieving chemical compatibility through the specific selection and concentration of additives.

Inventive Principle:

Principle #40Composite materials

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 composition provides improved resistance against corrosion, maintaining the lubricant's ability to resist corrosion effectively.

Implementation Method 1

oxidation inhibitor system comprising a molybdenum-containing antioxidant and a diphenylamine

Methodology Applied

Scientific EffectOxidation inhibition: Oxidation

Implementation Method 2

one or more alkylhydroxybenzoate compound derived from isomerized normal alpha olefins

Methodology Applied

Scientific EffectDetergent action: Surfactant

Data Source

PatentUS20260035634A1Lubricating oil composition for corrosion control

Publication Date: 2026.02.05 CHEVRON ORONITE CO LLC

AI summary

A lubricating oil composition is disclosed. The composition includes a major amount of an oil of lubricating viscosity, one or more alkylhydroxy benzoate compound derived from isomerized normal alpha olefins, and oxidation inhibitor system comprising a molybdenum-containing antioxidant and a diphenylamine. The molybdenum-containing antioxidant is present in an amount to provide at least 120 ppm of Mo to the lubricating oil composition. The diphenylamine is present in an amount to provide 0.5 wt. % or more to the lubricating oil composition.