Composition for impregnating materials to shield against the effects of alternating electromagnetic fields, its application in coating/impregnating fibrous and/or porous matrices and materials containing the same
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Solution Overview
Problem
Existing EMF shielding materials are heavy, expensive, and often require grounding, and most solutions are designed for specific frequency ranges, lacking effectiveness from low frequencies (10−2 Hz) to radio frequencies (106 Hz) without the need for grounding, while also being lightweight and versatile in form.
Innovation Solution
A composition comprising an aqueous solution of hydratable salts, polymer dispersions, and enhancing additives such as surface active agents and silicates, applied to base materials to create a composite matrix that shields against electromagnetic fields from 10−2 Hz to 106 Hz without grounding, suitable for various forms like foils, textiles, and construction materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If classical shielding materials (metals, carbon, conductive polymers) are used, then shielding effectiveness is improved, but weight and cost increase
Solution Approach 1:
The patent uses composite materials consisting of dielectric polymer matrices combined with magnetic particles (ferrites, iron oxide) and conductive fillers (carbon black, graphite). This composite approach achieves effective EMF shielding through the synergistic combination of magnetic losses and dielectric properties, while maintaining lower weight compared to traditional metal shields.
Solution Approach 2:
The patent optimizes shielding performance by carefully controlling the concentration, size distribution, and morphology of magnetic and conductive fillers within the polymer matrix. By adjusting these parameters, the material achieves effective shielding across a broad frequency range without requiring high filler loadings that would increase density and weight.
2Reliability
If multi-phase composite materials are used, then shielding performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple functional components (magnetic particles, conductive fillers, dielectric polymer matrix) into a single integrated composite material system. This merging of functions into one material eliminates the need for separate shielding layers and simplifies manufacturing compared to multi-layer composite structures.
Solution Approach 2:
The patent creates heterogeneous composite structures where magnetic and conductive fillers are distributed throughout the polymer matrix with optimized local concentrations. This local quality approach ensures effective shielding performance throughout the material volume while maintaining processable formulations.
3Reliability
If shields are designed for specific frequency ranges, then shielding effectiveness at target frequency is improved, but versatility across frequency ranges decreases
Solution Approach 1:
The patent develops composite materials with broad-spectrum shielding capability by combining magnetic particles (effective at low frequencies through magnetic losses) with conductive fillers and dielectric polymers (effective at higher frequencies through dielectric losses and conductivity). This multi-functional composition enables effective shielding across a wide frequency range from ELF to RF bands.
Solution Approach 2:
The synergistic combination of magnetic and non-magnetic conductive phases in the composite creates complementary shielding mechanisms that operate effectively across different frequency ranges, providing universal shielding performance without requiring frequency-specific material selection.
4Reliability
If traditional metal shields are used, then shielding effectiveness is improved, but grounding requirements and installation complexity increase
Solution Approach 1:
The patent employs intrinsically shielding materials that do not require external grounding connections to function. The composite materials generate their own shielding effect through inherent magnetic and dielectric losses, eliminating the need for grounding infrastructure and simplifying installation compared to traditional Faraday cage systems.
Solution Approach 2:
The patent replaces the mechanical grounding system required by traditional metal shields with intrinsic material properties (magnetic losses and dielectric conductivity) that provide shielding without external connections. This substitution eliminates complex grounding installations while maintaining effective shielding performance.
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 provides effective electromagnetic field shielding across a broad frequency range, from low frequencies to radio frequencies, in a lightweight and versatile form, without the need for grounding, enhancing protection for both human health and electronic devices.
Implementation Method 1
a composition for application to a base material, thus rendering the base material able to shield against the effects of alternating electromagnetic fields
Implementation Method 2
an aqueous solution of a salt that may form hydrates or a combination of salts, at least one of which forms a hydrate
Data Source
AI summary
A composition for application to a base material, rendering the base material able to shield alternating electromagnetic fields in the range from low frequencies up to radio frequencies, includes an aqueous solution of a hydratable salt; a modifier selected from the group consisting of acrylic dispersions, styrene-acrylic dispersions, silicone emulsions and combinations thereof; and an enhancing additive selected from the group consisting of surface active agents, aluminosilicates, silicates, soluble calcium compounds, insoluble calcium compounds, metal oxides, metalloid oxides and combinations thereof. The alternating field is shielded at least in the range from 10−2 Hz to 106 Hz. The composition may be used to coat/impregnate fibrous and/or porous matrices.