Phosphate Ester Hydraulic Fluid Thermal Stability
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Solution Overview
Problem
Aircraft hydraulic fluids require enhanced thermal stability, low temperature viscosity, and extended fluid life while maintaining acceptable fire/flash points and material compatibility to meet the increasing demands of high-performance aircraft operations.
Innovation Solution
Aircraft hydraulic fluid compositions comprising 55-65% tri(n-butyl)phosphate, 8-12% tri(iso-propylphenyl) phosphate, and 8-12% tri(isobutyl) phosphate, along with additives such as polymeric viscosity index improvers, anti-erosion agents, corrosion inhibitors, and antioxidants, to achieve improved performance standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional phosphate ester formulations are used, then thermal and oxidative stability is provided, but fluid life and fire resistance are insufficient
Solution Approach 1:
The patent changes the chemical composition parameters by specifying precise ratios of trialkyl phosphates (30-45% triisobutyl phosphate, 30-45% tri-n-butyl phosphate) and triaryl phosphates (10-15%), along with controlled additive levels, to simultaneously achieve extended fluid life exceeding 1000 hours at 125°C and 10,000 hours at 60°C while maintaining thermal stability
Solution Approach 2:
The patent creates a composite hydraulic fluid formulation combining multiple phosphate ester components (trialkyl phosphates and triaryl phosphates) with specific additives including viscosity index improvers, corrosion inhibitors, antierosion agents, and antioxidants in optimized proportions to achieve superior overall performance
2Stability of the object's composition
If phosphate ester base stocks are formulated for high performance, then thermal stability is improved, but fire/flash point requirements are compromised
Solution Approach 1:
The patent adjusts the chemical composition parameters by controlling the ratios of different phosphate ester components and additive concentrations to achieve a balance where thermal stability is enhanced while fire/flash point requirements are maintained at acceptable levels
3Duration of action of moving object
If fluid composition is optimized for extended fluid life, then thermal stability is improved, but low temperature viscosity performance deteriorates
Solution Approach 1:
The patent modifies the fluid composition parameters by selecting specific phosphate ester components and controlling additive levels, including viscosity index improvers, to simultaneously achieve extended fluid life and acceptable low temperature viscosity performance
Solution Approach 2:
The patent formulates a composite fluid composition combining phosphate ester base stocks with specific additives including viscosity index improvers, corrosion inhibitors, and antioxidants in optimized proportions to achieve both extended fluid life and satisfactory low temperature viscosity
4Stability of the object's composition
If hydraulic fluid performance requirements are increased for high-performance aircraft, then thermal stability is improved, but material compatibility is compromised
Solution Approach 1:
The patent adjusts the chemical composition parameters by controlling the ratios of phosphate ester components and additive concentrations to maintain compatibility with elastomer seals and other hydraulic system materials while achieving improved thermal stability
Solution Approach 2:
The patent creates a composite fluid formulation combining phosphate ester base stocks with specific additives including corrosion inhibitors and antioxidants in optimized proportions to maintain material compatibility while achieving high-performance thermal stability
Data Source
AI summary
This application discloses a high performance hydraulic fluid suitable for use as an aircraft hydraulic fluid comprising a major amount of tri(n-butyl)phosphate, a minor amount of a triaryl phosphate and optionally a minor amount of tri(isobutyl)phosphate. The compositions of this invention provide superior performance with respect to flash and fire points as well as extended useful fluid life in service. Such properties are highly valuable as hydraulic fluids modern jet aircrafts.