Refrigeration Machine Oil Acid Value Control

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Solution Overview

Problem

Refrigerating machine oils with phosphorus-based additives exhibit excellent antiwear properties initially but tend to degrade over time, leading to stability issues during long-term storage.

Innovation Solution

The use of hydrocarbyl hydrogen phosphite with a specific acid value, comprising monohydrocarbyl and dihydrocarbyl hydrogen phosphite, is employed to maintain antiwear properties and stability by controlling the acid value through partial hydrolysis or purification, ensuring the acid value remains 100 mgKOH/g or less.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If phosphorus-based additives are used to improve antiwear property, then antiwear property is improved, but stability deteriorates over time

Engineering Contradiction:

Improveantiwear propertyVSAvoidstability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The invention changes the chemical composition parameters by using hydrocarbyl hydrogen phosphite with specific acid value (100 mgKOH/g or less) instead of conventional phosphorus-based additives. This parameter change maintains antiwear property while improving long-term stability by preventing the formation of harmful degradation products.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses a readily available, inexpensive additive (hydrocarbyl hydrogen phosphite) that provides sufficient antiwear protection for the required service life without requiring complex or expensive alternative compounds. The additive is effective for the intended duration without needing elaborate stabilization systems.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If dihydrocarbyl hydrogen phosphite is used, then antiwear property is improved, but acid value increases during storage

Engineering Contradiction:

Improveantiwear propertyVSAvoidacid value

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The invention performs preliminary action by selecting hydrocarbyl hydrogen phosphite with pre-controlled acid value (100 mgKOH/g or less) before storage begins. This preliminary selection prevents the acid value from rising to harmful levels during storage, avoiding the need for corrective measures later.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention converts the potential harm of acid value increase into a benefit by using hydrocarbyl hydrogen phosphite that naturally maintains stable acid value. The compound's structure inherently prevents excessive acidification, turning what could be a harmful degradation into a stable or improving characteristic.

Inventive Principle:

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

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

This approach results in a refrigerating machine oil that maintains excellent antiwear properties and stability over a long period, preventing degradation and ensuring consistent performance.

Implementation Method 1

the acid value increases as a portion of the dihydrocarbyl hydrogen phosphite changes over time to monohydrocarbyl hydrogen phosphite and/or hydrogen phosphite or the like during storage

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Data Source

PatentUS11680220B2Refrigeration machine oil and refrigeration machine oil production method

Publication Date: 2023.06.20 ENEOS CORP

AI summary

The present invention provides a method for producing a refrigerating machine oil, comprising blending a hydrocarbyl hydrogen phosphite having an acid value of 100 mgKOH/g or less with a lubricating base oil or an oil composition containing a lubricating base oil, and a refrigerating machine oil obtained by the method.