Phosphate Ester Additive Composition for Hydraulic Fluids
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Phosphate ester-based hydraulic fluids have excellent lubricity and fire-resistant properties but suffer from inferior hydrolytic stability, low viscosity index, and chemical aggressiveness, limiting their use due to compatibility issues with conventional seal and coating materials, and concerns regarding soil biodegradability and toxicity.
Innovation Solution
An additive composition comprising phosphate esters derived from phosphoric acid and monomer glycols, combined with corrosion inhibitors, antioxidants, and surfactants, is used to enhance the properties of hydraulic and heat transfer fluids, with a focus on using glycerin by-products for improved ecological and economic benefits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphate esters are used as base fluid for hydraulic fluids, then lubricity and fire resistance are improved, but hydrolytic stability and compatibility with seal materials deteriorate
Solution Approach 1:
The patent introduces an additive package containing corrosion inhibitors, antioxidants, and viscosity index improvers as intermediaries that mediate between the phosphate ester base fluid and the system components. This additive package protects against hydrolysis and improves compatibility with seal materials while preserving the fire resistance benefits of phosphate esters.
Solution Approach 2:
The patent creates a composite hydraulic fluid system by combining phosphate ester base fluid with carefully selected additive packages and potentially blending with other compatible base fluids. This composite approach allows the system to exhibit both the fire resistance of phosphate esters and improved hydrolytic stability through the synergistic effects of the additive package.
2Reliability
If phosphate esters are used as base fluid, then lubricity is improved, but chemical aggressiveness toward seal materials increases
Solution Approach 1:
The additive package serves as a protective intermediary layer between the phosphate ester and seal materials. Corrosion inhibitors and compatibility agents in the additive package form protective films on metal surfaces and interact with seal materials to reduce chemical aggressiveness while allowing the phosphate ester to maintain its lubricity benefits.
3Reliability
If conventional hydraulic fluids are used, then fire resistance is reduced, but biodegradability and ecological impact are worsened
Solution Approach 1:
The patent modifies the chemical parameters of the hydraulic fluid by selecting phosphate esters with specific molecular structures and chain lengths that balance fire resistance with reduced toxicity. The additive package is also formulated with parameters optimized for reduced environmental impact, creating a fluid system that maintains fire safety while improving biodegradability and reducing ecological harm.
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 additive composition provides improved lubricity, fire resistance, and reduced corrosion, while promoting vegetation growth and offering significant ecological and economic advantages over mineral oil and synthetic ester-based fluids, with enhanced biodegradability and reduced toxicity.
Implementation Method 1
Phosphate ester based hydraulic fluids have good lubricity
Implementation Method 2
one or more phosphate esters that are derived from the esterification of phosphoric acid and one or more monomer glycols
Implementation Method 3
Their high ignition temperatures, excellent oxidation stability and very low vapor pressures make them difficult to burn
Implementation Method 4
excellent oxidation stability
Implementation Method 5
corrosion inhibitors, which as the name implies when added to a liquid or gas, decrease the common rate of corrosion of a material, typically a metal alloy
Implementation Method 6
anti-oxidants, which inhibit the oxidation of other compounds of a chemical composition
Implementation Method 7
surfactants, which are compounds that lower the surface tension between two liquids, between a liquid and a gas and between a liquid and a solid
Implementation Method 8
Their high ignition temperatures, excellent oxidation stability and very low vapor pressures make them difficult to burn
Implementation Method 9
their low heats of combustion result in self-extinguishing fluids
Data Source
AI summary
An additive composition for a hydraulic fluid, or a heat transfer fluid, comprises one or more phosphate esters derived from the esterification of phosphoric acid and one or more monomer glycols containing up to 18 carbon atoms, or combinations thereof. In addition, the additive composition may comprise one or more corrosion inhibitors selected from the group consisting of dicarboxylic acids, alkanolamines or combinations thereof; one or more antioxidants including selected from the group consisting of one or more organosulfur compounds, one or inorganic oxyanion salts or combinations thereof; and, one or more surfactants.