Lubricating Oil Composition for Turbomachinery Sludge Prevention
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Solution Overview
Problem
Lubricating oil compositions used in turbomachinery and machine tools face issues with sludge precipitation due to oxidative deterioration in high-temperature environments and poor water separability, especially when contaminated with water or steam.
Innovation Solution
A lubricating oil composition combining mineral oil with polyalkylene glycol (PAG) and polyol ester (POE), along with additives like amine-based antioxidants and phosphorus compounds, to enhance oxidation stability and water separability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lubricating oil composition is used in high-temperature environments for long periods, then oxidation stability is required, but sludge precipitation occurs due to oxidative deterioration
Solution Approach 1:
The patent applies parameter changes by carefully controlling the oxygen/carbon weight ratio of the control constituent within 0.080 to 0.350, and the aromatic hydrocarbon content within 0.003 to 0.03 mass%. These parameter optimizations prevent oxidative deterioration and sludge precipitation while maintaining oxidation stability in high-temperature environments
Solution Approach 2:
The patent uses a composite base oil composition comprising Group II or III mineral oils combined with synthetic oils (polyalphaolefin, ester oil, or polyglycol). This composite material approach creates synergistic effects that enhance oxidation resistance and prevent sludge formation while maintaining lubrication performance
2Reliability
If the lubricating oil composition is required to be hardly emulsified, then water separability must be excellent, but contamination with water or steam causes emulsification
Solution Approach 1:
The patent optimizes the aromatic hydrocarbon content within 0.003 to 0.03 mass% and controls the oxygen/carbon weight ratio of the control constituent, which significantly improves water separability and prevents emulsification while maintaining oxidation stability in the lubricating oil composition
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 prevents sludge precipitation and maintains excellent water separability over long periods in high-temperature environments, making it suitable for turbomachinery and machine tools.
Implementation Method 1
it is susceptible to sludge precipitation according to oxidative deterioration
Implementation Method 2
the lubricating oil composition is required to be hardly emulsified and to be easily separated from water even when emulsified, that is, to be excellent in water separability
Data Source
AI summary
Provided is a lubricating oil composition for use in turbomachinery, compressors, hydraulic equipments, or machine tools, which contains a mineral oil (A) and a synthetic oil (B) containing a polyalkylene glycol (B1) and a polyol ester (B2), in which the content of the mineral oil (A) is 5 to 95% by mass based on the total amount of the lubricating oil composition, and which is used in turbomachinery, compressors, hydraulic equipments, or machine tools. The lubricating oil composition is excellent in oxidation stability, has a strong effect of preventing sludge precipitation and has excellent water separability even in use for a long period of time in high-temperature environments.