Refrigerator Oil Composition Using Epoxy Ester for HFO Stability
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Solution Overview
Problem
Refrigerator oil compositions face an increase in acid value due to the use of unsaturated fluorinated hydrocarbon compounds (HFO) in refrigerants, especially under high-temperature conditions, which is exacerbated by the compactification and increased performance of refrigerators.
Innovation Solution
A refrigerator oil composition containing a specific epoxy compound, combined with base oils such as polyalkylene glycol, polyvinyl ether, or polyol ester compounds, effectively suppresses the increase in acid value by capturing fluorine components generated from HFO decomposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If unsaturated fluorinated hydrocarbon compounds (HFO) are used in refrigerant to reduce global warming potential, then environmental performance is improved, but thermal stability deteriorates and acid value increases at high temperatures
Solution Approach 1:
An epoxy compound is introduced as an intermediary substance that captures fluorine components generated from HFO decomposition. The epoxy compound reacts with the fluorine components, preventing them from causing acid value increase and maintaining oil stability, thus enabling the use of HFO refrigerants without suffering from their thermal instability
Solution Approach 2:
The harmful fluorine components generated from HFO decomposition at high temperatures are converted into beneficial effects by having them react with the epoxy compound. This reaction captures the harmful fluorine components, transforming them from substances that increase acid value into reaction products that maintain system stability
2Productivity
If refrigerator is made more compact with higher performance, then productivity is improved, but operating conditions become severer causing increased acid value
Solution Approach 1:
The epoxy compound is added to the refrigerator oil composition beforehand to cushion against the severe operating conditions generated by compact, high-performance refrigerators. It provides preemptive protection by capturing fluorine components before they can cause significant acid value increase, even under high-temperature and high-friction conditions
3Object-affected harmful factors
If content of unsaturated fluorinated hydrocarbon compound (HFO) in refrigerant is increased, then environmental performance is improved, but acid value of refrigerator oil composition increases
Solution Approach 1:
The epoxy compound serves as an intermediary that intercepts fluorine components from HFO decomposition. By increasing HFO content for better environmental performance, the system generates more fluorine components, but the epoxy compound captures these components, preventing acid value increase and maintaining oil quality
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 effectively reduces the acid value increase in refrigerator oil, maintaining stability under high-temperature conditions by minimizing HFO decomposition and capturing fluorine components.
Implementation Method 1
the epoxy compound (B) satisfies the following requirements (B1) and (B2): (B1) at least one divalent group represented by the following formula (1) is present in the molecule; (B2) at least one ester group is present in the molecule
Data Source
AI summary
A refrigerator oil composition, including a refrigerant containing one or more unsaturated fluorinated hydrocarbon compounds of the following general formula (1):CxFyHz (1)where x is an integer of 2 to 6, y is an integer of 1 to 11, z is an integer of 1 to 11, and one or more carbon-carbon unsaturated bonds are present. The refrigerator oil composition further includes a base oil (A) selected from the group consisting of a polyalkylene glycol compound, a polyvinyl ether compound, a copolymer of poly(oxy)alkylene glycol or a monoether thereof and a polyvinyl ether, and a polyol ester compound, and an epoxy compound (B), where the epoxy compound (B) contains the following (B1) and (B2):(B1) at least one divalent group represented by the following formula (1),(B2) at least one ester group.