Magneto-rheological Elastomer Composition for Vibration Absorption
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Solution Overview
Problem
Conventional magneto-rheological compositions do not sufficiently change their storage moduli upon application of magnetism, limiting their vibration absorbing and damping capabilities.
Innovation Solution
A magneto-rheological elastomer composition is developed, comprising a matrix resin and 30-70% by volume magnetic powder, with a specific formulation including a linear organopolysiloxane base polymer, an organohydrogenpolysiloxane crosslinking component, a platinum-based catalyst, and an optional inorganic pigment, which significantly changes its storage modulus when exposed to a magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional magneto-rheological compositions are used, then the composition can be formulated with magnetic filler in a resin material, but the storage modulus does not sufficiently change upon application of magnetism
Solution Approach 1:
The patent changes the physical-chemical parameters of the magneto-rheological composition by specifying a magnetic powder content of 30-70% by volume and controlling the Asker C hardness to 5-60. These parameter adjustments enable the composition to exhibit significant storage modulus changes (5 times or more) upon magnetic field application, directly resolving the insufficient storage modulus change problem while enhancing vibration absorbing capability
Solution Approach 2:
The patent creates a composite material system combining magnetic powder (such as carbonyl iron powder or permalloy) with a resin matrix (silicone rubber or polyurethane). This composite structure, with optimized magnetic powder content and controlled hardness, enables both structural integrity and high responsiveness to magnetic fields, achieving sufficient storage modulus change and improved vibration absorbing performance
2Strength
If magnetic powder content is increased to improve storage modulus change, then vibration absorbing property improves, but the composition may become too rigid or difficult to process
Solution Approach 1:
The patent optimizes the magnetic powder content to 30-70% by volume and controls the Asker C hardness to 5-60, finding the optimal balance point where sufficient storage modulus change is achieved while maintaining adequate handleability for processing and manufacturing. This parameter optimization prevents the composition from becoming too rigid while ensuring high vibration absorbing capability
Solution Approach 2:
The patent applies local quality control by specifying different optimal ranges for different applications - softer compositions (lower Asker C hardness) for applications requiring flexibility and easier processing, and harder compositions (higher Asker C hardness) for applications requiring higher structural stability, all while maintaining the 30-70% magnetic powder content range to ensure sufficient storage modulus change
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 exhibits a high change in storage modulus upon magnetic application, enhancing vibration absorption and damping effects, making it suitable for various applications including vibration absorption devices.
Implementation Method 1
A fluid that changes its rheological property upon application of a magnetic field is called a magneto-rheological fluid (MR fluid)... MR elastomers with high handleability have been proposed recently
Data Source
AI summary
A magneto-rheological elastomer composition (10) includes a matrix resin (12) and a magnetic powder (11). The magnetic powder (11) is contained in an amount of 30 to 70% by volume based on 100% by volume of the composition. The magneto-rheological elastomer composition (10) has an Asker C hardness of 5 to 60 as determined by the Standard SRIS0101 of the Society of Rubber Science and Technology, Japan. The average particle size of the magnetic powder is preferably 2 to 500 μm, and the matrix resin is preferably an organopolysiloxane. The storage modulus of the magneto-rheological elastomer composition preferably changes by five times or more upon application of a magnetic force with a magnetic flux density of 200 mT. Thus, the present invention provides a magneto-rheological elastomer composition that greatly changes its storage modulus upon application of magnetism, a method for producing the same, and a vibration absorbing device including the same.