Hexaester Refrigerant Oil Low-Temperature Crystallization
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Solution Overview
Problem
Current refrigerant oils lack balanced characteristics such as low temperature properties and oxidation stability, leading to potential cooling failures and instability in refrigeration systems.
Innovation Solution
A hexaester of bispentaerythritol monoformal is developed, comprising bispentaerythritol monoformal and C8 or C9 branched aliphatic monocarboxylic acids, specifically 3,5,5-trimethylhexanoic acid, which forms a refrigerant oil composition with enhanced low temperature and oxidation stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional refrigerant oils are used, then lubrication function is provided, but low temperature properties deteriorate causing crystallization and cooling failure
Solution Approach 1:
The patent changes the chemical parameters of the refrigerant oil by using bispentaerythritol monoformal as the base material and reacting it with specific C8-C10 carboxylic acids. This chemical parameter change results in a hexaester compound with modified molecular structure that prevents crystallization at low temperatures while maintaining lubrication properties, directly resolving the contradiction between reliability at low temperature and harmful crystallization effects.
Solution Approach 2:
The invention creates a composite chemical structure by combining bispentaerythritol monoformal with multiple different carboxylic acids (C8-C10 branched and unbranched varieties). This composite approach produces a refrigerant oil with balanced properties that simultaneously achieves excellent low-temperature fluidity and high-temperature stability, preventing both low-temperature crystallization and high-temperature degradation.
2Object-affected harmful factors
If HFC refrigerant is used, then ozone depletion is prevented, but lubricity is insufficient causing thermal and oxidative degradation
Solution Approach 1:
The patent changes the chemical composition parameters by synthesizing hexaester from bispentaerythritol monoformal and specific carboxylic acids. This produces a refrigerant oil with enhanced molecular stability that resists thermal and oxidative degradation, directly addressing the reliability deterioration caused by using environmentally friendly HFC refrigerants with insufficient lubricity.
3Productivity
If refrigerant oil is exposed to low temperature for long period, then circulation continues, but crystallization occurs reducing circulating amount
Solution Approach 1:
The invention changes the physical-chemical parameters of the refrigerant oil through the specific hexaester structure, which maintains liquid state and prevents crystallization even after prolonged exposure to low temperatures. This ensures stable circulation and prevents the reduction in circulating amount that would lead to cooling failure.
Data Source
AI summary
Provided is hexaester of bispentaerythritol monoformal, which comprises the bispentaerythritol monoformal represented by the following formula (I), and any one of carboxylic acids selected from C8 and C9 branched aliphatic monocarboxylic acids:The hexaester has well-balanced excellent characteristics, such as low temperature properties and oxidation stability, and is used for industrial lubricating oil, such as a refrigerant oil composition.