Refrigerating Machine Oil Composition for Anti-Wear Agent Stability
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Solution Overview
Problem
The decomposition of anti-wear agents in refrigerating machine oil containing specific esters as base oil leads to a reduction in their residual amount, compromising the expected anti-wear function.
Innovation Solution
The use of esters of polyhydric alcohol and fatty acids with specific proportions of unsaturated fatty acids, particularly controlling the number of carbon-carbon unsaturated bonds, ensures the residual amount of anti-wear agents in the refrigerating machine oil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ester of polyhydric alcohol and fatty acid is used as base oil, then lubrication performance is improved, but anti-wear agent decomposes easily
Solution Approach 1:
The patent applies parameter changes by precisely controlling the proportion of unsaturated fatty acids having two or more C=C bonds within 20% by mole or less based on the total amount of unsaturated fatty acid. This parameter optimization prevents excessive decomposition of the anti-wear agent while maintaining the lubrication performance provided by the ester base oil.
Solution Approach 2:
The patent uses a composite approach by combining ester base oil with specific fatty acid composition (controlling both saturated and unsaturated components) and anti-wear agents. This composite formulation creates a synergistic effect where the controlled unsaturated fatty acid content protects the anti-wear agent from decomposition while the ester provides lubrication.
2Adaptability or versatility
If unsaturated fatty acids with multiple C=C bonds are increased, then refrigerant dissolution properties improve, but anti-wear agent stability deteriorates
Solution Approach 1:
The patent optimizes the parameter of unsaturated fatty acid composition by limiting the proportion of fatty acids with two or more C=C bonds to 20% by mole or less. This parameter control balances the refrigerant dissolution properties (which benefit from unsaturation) with the stability of the anti-wear agent (which deteriorates with excessive unsaturation).
Data Source
AI summary
A refrigerating machine oil that can ensure the residual amount of an anti-wear agent. The refrigerating machine oil comprises an ester of a polyhydric alcohol and a fatty acid having 14 to 20 carbon atoms as a base oil, and an anti-wear agent. The fatty acid having 14 to 20 carbon atoms comprises an unsaturated fatty acid, which includes an unsaturated fatty acid having one carbon-carbon unsaturated bond and an unsaturated fatty acid having two or more carbon-carbon unsaturated bonds. The proportion of the unsaturated fatty acid having two or more carbon-carbon unsaturated bonds is 20% by mole or less based on the total amount of the unsaturated fatty acid.