Magnetic Layer Shielding Material Balancing EMI and Impact Durability
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Solution Overview
Problem
Existing electromagnetic wave shielding materials struggle to achieve a high shielding ability while maintaining durability, especially when subjected to external forces such as impact or collision.
Innovation Solution
The development of an electromagnetic wave shielding material comprising a magnetic layer with magnetic particles and a resin, sandwiched between two metal layers, where the magnetic layer contains 13-30 parts by mass of a urethane bond-containing resin per 100 parts by mass, and has a glass transition temperature of −60° C. or higher and lower than 0° C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the shielding material uses a magnetic layer with resin to achieve high shielding ability, then the electromagnetic wave shielding performance is improved, but the durability against external forces deteriorates
Solution Approach 1:
The patent uses a composite material structure consisting of a magnetic layer containing magnetic particles and resin, sandwiched between two metal layers. This composite structure combines the electromagnetic wave shielding properties of magnetic materials with the mechanical strength and durability of metal layers, resolving the contradiction between shielding performance and durability against external forces.
Solution Approach 2:
The patent specifies precise parameter ranges for the resin content (13-30 parts by mass per 100 parts by mass of total magnetic layer mass) and glass transition temperature (−60°C or higher and lower than 0°C) to optimize both shielding ability and durability. By controlling these parameters, the magnetic layer achieves adequate shielding performance while maintaining flexibility and adhesion to withstand external forces.
2Reliability
If the magnetic layer contains higher resin content to improve flexibility and adhesion, then the durability is improved, but the shielding ability deteriorates
Solution Approach 1:
The patent defines an optimal resin content range of 13-30 parts by mass per 100 parts by mass of total magnetic layer mass. This parameter control ensures that the resin provides sufficient flexibility and adhesion for durability while maintaining enough magnetic particle concentration to achieve effective electromagnetic wave shielding, thus resolving the contradiction between durability and shielding ability.
Solution Approach 2:
The patent specifies different functional requirements for different components: the resin provides flexibility and adhesion (durability function), while the magnetic particles provide electromagnetic wave shielding. By assigning specific local functions to each component and controlling their proportions, the patent resolves the contradiction between durability and shielding ability.
3Reliability
If the glass transition temperature of the resin is lowered to improve flexibility, then the durability against external forces is improved, but the adhesion to metal layers deteriorates
Solution Approach 1:
The patent specifies the glass transition temperature of the resin should be −60°C or higher and lower than 0°C. This parameter control ensures the resin maintains adequate flexibility and adhesion at operating temperatures while providing sufficient durability against external forces, resolving the contradiction between flexibility and adhesion strength.
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
This configuration enhances the shielding ability and durability of the material, allowing it to effectively reduce electromagnetic wave influence in electronic components and apparatuses while withstanding external forces.
Implementation Method 1
An electromagnetic wave shielding material (hereinafter, also described as a 'shielding material') is capable of exhibiting the performance of shielding electromagnetic waves (hereinafter, also referred to as an 'electromagnetic wave shielding ability' or a 'shielding ability') by reflecting electromagnetic waves incident on the shielding material by the shielding material and/or by attenuating the electromagnetic waves in the inside the shielding material.
Implementation Method 2
the magnetic layer contains 13 parts by mass or more and less than 30 parts by mass of a urethane bond-containing resin with respect to 100 parts by mass of a total mass of the magnetic layer... a glass transition temperature of the urethane bond-containing resin is −60° C. or higher and lower than 0° C.
Data Source
AI summary
Provided are an electromagnetic wave shielding material including a magnetic layer containing magnetic particles and a resin, between two metal layers, in which the magnetic layer is in direct contact with each of the two metal layers, and the magnetic layer contains 13 parts by mass or more and less than 30 parts by mass of a urethane bond-containing resin with respect to 100 parts by mass of a total mass of the magnetic layer, and an electronic component and an electronic apparatus including the electromagnetic wave shielding material.