Magnetic Viscous Fluid Composition for Stable High Drag Force
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Solution Overview
Problem
Existing magnetic viscous fluids exhibit unsatisfactory drag force during excitation and poor aging stability of drag force, limiting their effectiveness in mechanical devices such as brakes and dampers.
Innovation Solution
A magnetic viscous fluid comprising magnetic particles, base oil, an inorganic cation exchanger with a siloxane bond, and silicone oil, where the solubility parameter difference between the base oil and silicone oil is 1.3 (cal/cm3)1/2 or more, preventing excessive agglomeration and maintaining high drag force and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If magnetic particles are dispersed in a carrier fluid to form a magnetic viscous fluid, then the fluid can control frictional forces in mechanical devices, but the drag force during excitation is small and unsatisfactory
Solution Approach 1:
The patent changes the chemical parameters of the dispersion medium by selecting base oils with specific solubility parameters (9.0-12.0 (cal/cm³)¹/²) and combining them with silicone oil in controlled ratios. This parameter optimization ensures the magnetic particles form clusters with appropriate density and structure, achieving both high drag force during excitation and stable aging characteristics.
Solution Approach 2:
The patent creates a composite dispersion medium by combining base oil (ester base synthetic oil, ether base synthetic oil, or alkylnaphthalene) with silicone oil in specific proportions. This composite approach leverages the complementary properties of both oils to achieve optimal magnetic particle clustering and fluid performance, resolving the contradiction between drag force and aging stability.
2Force
If magnetic particles form clusters when a magnetic field is applied, then the fluid exhibits high drag force, but the aging stability of the drag force deteriorates
Solution Approach 1:
The patent optimizes the solubility parameter of the dispersion medium to be within 9.0-12.0 (cal/cm³)¹/², which controls the interaction between magnetic particles and the medium. This parameter control ensures that particles form stable, reproducible clusters that maintain consistent drag force characteristics over time, improving aging stability while preserving high drag force.
Solution Approach 2:
The patent introduces silicone oil with specific local properties (low viscosity, high stability) into the dispersion medium to create localized environments around magnetic particles. This local quality enhancement stabilizes the particle clusters and prevents degradation, achieving both high drag force and excellent aging stability.
3Stability of the object's composition
If a clay mineral-based dispersion stabilizer and surfactant are used, then the fluid structure is stabilized, but the drag force during excitation remains small
Solution Approach 1:
The patent changes the fundamental parameter of the dispersion medium by selecting base oils with specifically controlled solubility parameters (9.0-12.0 (cal/cm³)¹/²). This parameter change enables the magnetic particles to interact more effectively with the medium, forming denser and more responsive clusters that generate higher drag force during excitation while maintaining fluid stability.
Solution Approach 2:
The patent replaces or supplements traditional clay mineral stabilizers with a composite approach using base oil and silicone oil combinations. This composite dispersion medium provides both stabilization and enhanced drag force generation by optimizing the chemical environment for magnetic particle clustering.
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 solution results in a magnetic viscous fluid with excellent drag force during excitation and improved aging stability, ensuring consistent performance in mechanical devices.
Implementation Method 1
When a magnetic field is applied to the magnetic viscous fluid, the magnetic particles form numerous clusters and thicken, causing an internal stress to increase
Implementation Method 2
where a difference A−B between a solubility parameter A of the base oil and a solubility parameter B of the silicone oil is 1.3 (cal/cm3)1/2 or more
Data Source
AI summary
The present invention provides a magnetic viscous fluid comprising a magnetic particle, base oil, an inorganic cation exchanger with a siloxane bond, and silicone oil. A difference A−B between a solubility parameter A of the base oil and a solubility parameter B of the silicone oil is 1.3 (cal/cm3)1/2 or more.