Lubricating Oil Composition for Chiller Refrigerants
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Solution Overview
Problem
Lubricating oils for refrigeration machines using unsaturated fluorinated hydrocarbons lack sufficient thermal and chemical stability, leading to phase separation and reduced efficiency, especially in car air conditioner systems, despite efforts with antioxidants and acid scavengers.
Innovation Solution
Incorporating specific organic compounds like 2,5-norbornadiene in a base oil composition, which includes polyoxyalkylene glycol, polyvinyl ether, and polyol ester compounds, to enhance compatibility and stability with refrigerants, thereby preventing phase separation and improving thermal and chemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antioxidants and acid scavengers are used in lubricating oil for unsaturated fluorinated hydrocarbon refrigerants, then some level of stability is achieved, but thermal and chemical stability remains insufficient, leading to phase separation
Solution Approach 1:
The patent changes the chemical parameter of the additive by selecting specific organic compounds with conjugated double bonds (such as norbornadiene, farnesene, and myrcene) that have unique electronic structures. These compounds fundamentally alter the interaction mechanism with unsaturated fluorinated hydrocarbon refrigerants, providing superior thermal and chemical stability and preventing phase separation that conventional antioxidants cannot achieve.
Solution Approach 2:
The patent creates a composite lubricating oil system by combining base oil with specific organic compounds that have conjugated double bonds. This composite formulation synergistically enhances compatibility with unsaturated fluorinated hydrocarbon refrigerants, maintaining system stability under high temperature conditions and preventing the phase separation that occurs with conventional single-component additives.
2Adaptability or versatility
If lubricating oil is circulated with refrigerant over wide temperature range, then system operation is enabled, but phase separation occurs at low and high temperatures reducing efficiency
Solution Approach 1:
The patent changes the physical parameter of temperature range adaptability by selecting organic compounds with specific molecular structures (conjugated double bonds) that maintain optimal viscosity and compatibility across extreme temperatures. These compounds prevent low-temperature phase separation by maintaining molecular flexibility and high-temperature stability through enhanced chemical bonding characteristics.
3Object-affected harmful factors
If existing car air conditioner system is used with low GWP refrigerant, then environmental protection is achieved, but refrigerant compatibility and system stability are insufficient
Solution Approach 1:
The patent changes the chemical parameter of refrigerant compatibility by selecting organic compounds with conjugated double bonds that specifically interact with unsaturated fluorinated hydrocarbon refrigerants. This chemical parameter optimization enables the use of low-GWP refrigerants in existing car air conditioner systems while maintaining system stability and preventing degradation issues.
Data Source
AI summary
It is to provide a lubricating oil composition for a refrigerating machine that has a low global warming potential by including in a base oil an organic compound having two or more non-conjugated double bonds in the molecule thereof, and that is particularly preferably used for a refrigerating machine using a refrigerant having a particular structure, such as an unsaturated Fluorinated hydrocarbon compound, which is a refrigerant capable of being used for existing car air conditioner system, air conditioners and the like, and that has excellent compatibility with the refrigerant and excellent thermal and chemical stability.