Hydraulic Fluid Composition Reducing Synthetic Rubber Swelling
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Solution Overview
Problem
Mineral-based aviation hydraulic fluids using naphthenic base oils often result in excessive swelling of synthetic rubbers, failing specification tests and being limited by supply constraints, while existing alternatives do not adequately address these issues.
Innovation Solution
A functional fluid composition combining 70-99.99% of a base oil composition comprising 50-95% naphthenic base oil and 5-50% Fischer-Tropsch derived base oil, with specific viscosity and flashpoint ranges, to reduce synthetic rubber swelling and enhance thermal stability and evaporation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If naphthenic base oils are used in hydraulic fluids to meet low temperature properties, then low temperature performance is improved, but synthetic rubber swelling increases excessively
Solution Approach 1:
The patent changes the chemical composition parameters of the base oil by blending naphthenic base oil with Fischer-Tropsch derived base oil in specific proportions (70-99.99% naphthenic, 0.01-30% Fischer-Tropsch). This parameter modification reduces the swelling effect on synthetic rubbers while preserving the low temperature performance characteristics of naphthenic base oils.
Solution Approach 2:
The patent creates a composite base oil system by combining two different base oil types (naphthenic and Fischer-Tropsch derived) in controlled ratios. This composite approach allows the hydraulic fluid to benefit from the low temperature properties of naphthenic oils while the Fischer-Tropsch component mitigates the excessive rubber swelling issue.
2Stability of the object's composition
If naphthenic base oils are used to achieve required viscosity properties, then viscosity specifications are met, but elastomer volume swell exceeds specification limits
Solution Approach 1:
The patent modifies the base oil composition parameters by introducing Fischer-Tropsch derived base oil (0.01-30% by weight) into the naphthenic base oil system. This compositional parameter change maintains the viscosity stability required for hydraulic fluid operation while reducing the elastomer swelling to within specification limits (19-30% for MIL-PRF-5606, 19-28% for MIL-PRF-6083).
3Productivity
If conventional naphthenic base oils are used, then hydraulic fluid functionality is maintained, but product supply is constrained globally
Solution Approach 1:
The patent introduces Fischer-Tropsch derived base oil as an intermediary substance that can partially replace naphthenic base oil in hydraulic fluid formulations. This intermediary component maintains the required hydraulic fluid functionality while reducing dependence on globally constrained naphthenic base oil supplies, thereby ensuring continued product availability.
4Object-affected harmful factors
If Fischer-Tropsch derived base oil replaces portion of naphthenic base oil, then synthetic rubber swelling is reduced, but thermal stability and evaporation resistance are enhanced
Solution Approach 1:
The patent utilizes parameter changes in the base oil composition, specifically incorporating 0.01-30% Fischer-Tropsch derived base oil, which fundamentally alters the chemical interaction with synthetic rubbers and thermal degradation behavior. This compositional parameter modification simultaneously achieves swelling reduction and enhanced thermal stability.
Data Source
AI summary
A functional fluid composition comprising: (a) from 70% to 99.99%, by weight of the fluid composition, of a base oil composition comprising: (i) from 50% to 95%, by weight of the base oil composition, of a naphthenic base oil; and (ii) from 5% to 50%, by weight of the base oil composition, of a Fischer-Tropsch derived base oil. The functional fluid compositions according to the present invention are suitable for use in hydraulic fluids and shock absorber fluids and are useful for reducing the volume swell of synthetic rubbers.