Complex Ester Refrigerant Oil for Trifluoroiodomethane Compatibility

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Solution Overview

Problem

Refrigerating machine oils face challenges in achieving both low two-layer separation temperature and high refrigerant dissolved viscosity, which are essential for compatibility and oil film retention with refrigerants like trifluoroiodomethane, as increasing one property often compromises the other.

Innovation Solution

A refrigerating machine oil composed of a complex ester synthesized from a polyhydric alcohol, a polybasic acid, and at least one monohydric alcohol or monocarboxylic fatty acid, which maintains low two-layer separation temperature while enhancing refrigerant dissolved viscosity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the refrigerating machine oil has high compatibility with the refrigerant (low two layer separation temperature), then the compatibility with the refrigerant is improved, but the refrigerant dissolved viscosity is reduced resulting in reduced oil film retention

Engineering Contradiction:

Improvecompatibility with refrigerantVSAvoidoil film retention

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters of the refrigerating machine oil by specifying a complex ester with particular molecular structure (synthesized from polyhydric alcohol, polybasic acid, and monohydric alcohol or monocarboxylic fatty acid) to achieve both low two layer separation temperature and high refrigerant dissolved viscosity simultaneously

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite ester structure combining multiple components (polyhydric alcohol, polybasic acid, monohydric alcohol, and monocarboxylic fatty acid) to create a refrigerating machine oil that achieves both compatibility and oil film retention properties that single-component oils cannot achieve

Inventive Principle:

Principle #40Composite materials

2Reliability

If the refrigerant dissolved viscosity of the refrigerating machine oil is increased to secure lubricity, then the oil film retention is improved, but the two layer separation temperature is relatively increased, and thus compatibility with the refrigerant is deteriorated

Engineering Contradiction:

Improveoil film retentionVSAvoidcompatibility with refrigerant

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent optimizes the molecular structure parameters of the complex ester, specifically controlling the synthesis from polyhydric alcohol, polybasic acid, and monohydric alcohol or monocarboxylic fatty acid to achieve the optimal balance between refrigerant dissolved viscosity and two layer separation temperature

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces specific functional groups at different positions within the complex ester molecule to locally enhance either refrigerant溶解性 or lubricity, allowing different parts of the molecular structure to fulfill different functions simultaneously

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11993742B2Working fluid composition for refrigerator, and refrigerator oil

Publication Date: 2024.05.28 ENEOS CORP

AI summary

A working fluid composition for a refrigerating machine, containing: a refrigerant containing trifluoroiodomethane; and a refrigerating machine oil containing a complex ester synthesized from a polyhydric alcohol, a polybasic acid, and at least one selected from a monohydric alcohol and a monocarboxylic fatty acid.