Polyvinyl Ether Refrigerant Oil Methoxy Group Compatibility
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Solution Overview
Problem
Compression-type refrigerators face challenges in maintaining compatibility between refrigerants and lubricating oils across a wide temperature range, leading to potential phase separation issues.
Innovation Solution
A refrigerator oil composition containing a polyvinyl ether-based compound with a structural unit having a methoxy group in its side chain, formulated to maintain compatibility with refrigerants at temperatures from low to high, ensuring minimal separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional polyvinyl ether compounds are used as refrigerator oil, then the oil provides basic lubrication, but phase separation occurs between the refrigerant and oil across wide temperature ranges
Solution Approach 1:
The invention modifies the chemical structure of polyvinyl ether compounds by introducing methoxy groups at specific positions in the molecular chain. This structural parameter change (adding -OCH3 groups) fundamentally alters the compatibility characteristics, enabling the lubricating oil to maintain homogeneous mixing with refrigerants across wide temperature ranges from -40°C to +100°C without phase separation.
Solution Approach 2:
The invention creates a composite molecular structure within the polyvinyl ether compound by combining ether groups (-O-), methoxy groups (-OCH3), and hydrocarbon chains in specific ratios. This composite structure at the molecular level provides both lubrication properties and refrigerant compatibility, resolving the contradiction between basic lubrication function and phase separation resistance.
2Temperature
If the refrigerator oil is designed for high temperature stability, then it maintains viscosity at high temperatures, but compatibility with refrigerant at low temperatures deteriorates
Solution Approach 1:
The invention introduces methoxy groups at specific local positions (side chains) of the polyvinyl ether molecular structure while maintaining the main chain integrity. This localized modification creates regions of enhanced polarity and refrigerant affinity without compromising the overall thermal stability of the molecular backbone, enabling simultaneous performance at both high and low temperatures.
Solution Approach 2:
By controlling the methoxy group content within specific ranges (0.1-10 mmol/g based on 1g of polyvinyl ether), the invention optimizes the balance between low-temperature compatibility and high-temperature stability. This quantitative parameter control ensures the oil remains compatible across the full operating temperature range of refrigeration systems.
Data Source
AI summary
The present invention relates to a refrigerator oil containing a polyvinyl ether-based compound (A) containing a structural unit (a1) having a methoxy group in a side chain thereof in an amount of 30 mol% or more and 100 mol% or less on a basis of 100 mol% of the whole amount of structural units excluding a terminal structural unit in a molecular structure thereof, a refrigerator oil composition containing the refrigerator oil, and a production method of the refrigerator oil.