Electromagnetic Shielding Composition for Thin Flexible Films
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Solution Overview
Problem
Existing electromagnetic shielding compositions fail to provide a thinned electromagnetic shielding film with both excellent electromagnetic shielding ability and bendability, and are economically inefficient due to limited conductive filler content and low apparent density.
Innovation Solution
An electromagnetic shielding composition comprising metal nanowires with a core-shell structure containing copper and silver, and plate-shaped metal particles, forming a network structure that enhances electrical conductivity and connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only wire-shaped conductive filler is used in the electromagnetic shielding composition, then the film maintains bendability, but the electromagnetic shielding rate cannot be improved above a certain level due to low apparent density and limited filler content
Solution Approach 1:
The patent uses a composite conductive filler system combining wire-shaped metal particles and plate-shaped metal particles. The wire-shaped particles provide bendability and network formation, while the plate-shaped particles enhance electromagnetic shielding rate through their high surface area to volume ratio and ability to form dense networks at lower concentrations. This composite approach resolves the contradiction by achieving both high shielding rate and acceptable bendability.
Solution Approach 2:
The patent changes the morphological parameter of the conductive filler from purely wire-shaped to a combination of wire-shaped and plate-shaped particles. This parameter change enables the composition to achieve higher electromagnetic shielding rates while maintaining bendability, as the plate-shaped particles can pack more densely and form more effective shielding networks at lower filler loadings.
2Ease of operation
If wire-shaped conductive filler is used to achieve bendability, then the film is suitable for wearable devices, but the apparent density is low and economic feasibility decreases due to increased filler content requirements
Solution Approach 1:
The patent employs a composite filler system where wire-shaped particles provide the necessary bendability and flexibility for wearable devices, while plate-shaped particles contribute to higher apparent density and more efficient electromagnetic shielding. This composite approach allows achieving target shielding performance with lower total filler content, improving economic feasibility while maintaining bendability.
Solution Approach 2:
The patent applies different filler particle shapes to different functional requirements: wire-shaped particles are optimized for providing bendability and flexibility in wearable applications, while plate-shaped particles are optimized for providing high shielding rate and density. This local differentiation of filler properties resolves the contradiction between bendability and economic efficiency.
3Reliability
If conductive filler content is increased to improve electromagnetic shielding ability, then the shielding rate improves, but the cost increases due to economic feasibility decrease
Solution Approach 1:
The patent uses a composite conductive filler system combining wire-shaped and plate-shaped metal particles. The plate-shaped particles have higher density and can form more effective shielding networks at lower concentrations, thereby achieving high electromagnetic shielding ability without requiring excessive filler content. This reduces material costs and improves economic feasibility while maintaining shielding performance.
Solution Approach 2:
The patent changes the filler morphology parameter to include plate-shaped particles alongside wire-shaped particles. This parameter change enables the composition to achieve high shielding ability at lower filler loadings, as plate-shaped particles pack more densely and provide more effective shielding per unit volume, thereby reducing costs and improving economic feasibility.
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 achieves a thinned electromagnetic shielding film with improved electromagnetic shielding efficiency and bendability, while reducing the need for high conductive filler content, thus being economically viable.
Implementation Method 1
forming a network structure that enhances electrical conductivity and connectivity
Implementation Method 2
an electromagnetic shielding composition including morphologically different metals... excellent electromagnetic shielding ability
Data Source
AI summary
An electromagnetic shielding composition according to the present invention is directed to an electromagnetic shielding composition capable of forming an electromagnetic shielding film with excellent electromagnetic shielding capacity and flexibility and, specifically, comprises: a core-shell structured metal nanowire comprising a core containing copper and a shell containing silver on the core; and plate-like metal particles selected from plate-like silver particles and silver-coated plate-like copper particles.