EMA Spray Foam for Irregular EMI Shielding

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Solution Overview

Problem

Existing EMI barriers are not suitable for small, inaccessible, and irregularly shaped components, as they are difficult to install and may not effectively block or absorb radiation due to limited surface area for adhesion.

Innovation Solution

A polyurethane spray foam containing electromagnetic absorber particles, such as graphene or iron particles, is used to create an EMI blocking material that can be easily applied to various surfaces, including flat, curved, and irregularly shaped areas, using a multi-chamber spray canister with a mixing component.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional EMI barrier materials are used, then EMI blocking capability is provided, but installation difficulty increases and adaptability to irregular surfaces decreases

Engineering Contradiction:

ImproveEMI blocking capabilityVSAvoidInstallation difficulty

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent changes the physical state of the EMI barrier material from rigid sheets to a sprayable foam composition. This parameter change allows the material to be applied in liquid form and then expand to form a protective barrier, transforming the application process from complex mechanical installation to simple spraying.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite material system combining polyol resin, isocyanate resin, and electromagnetic absorber particles. This composite formulation integrates the EMI-blocking function directly into the foam structure, eliminating the need for separate barrier materials and simplifying installation while maintaining reliability.

Inventive Principle:

Principle #40Composite materials

2Reliability

If traditional EMI barrier materials are used, then EMI blocking capability is provided, but adaptability to irregular surfaces deteriorates

Engineering Contradiction:

ImproveEMI blocking capabilityVSAvoidAdaptability to irregular surfaces

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The spray foam formulation creates a flexible, conformable material that can adapt to irregular surfaces and complex geometries. The foam expands to fill voids and conforms to contours, providing effective EMI blocking on surfaces that are difficult to reach or have complex shapes.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent utilizes the expansion properties of spray foam (a pneumatic/hydraulic principle) to adapt the material to various surface geometries. The foam expands after application to fill gaps and conform to irregular surfaces, enhancing adaptability while maintaining EMI blocking effectiveness.

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Reliability

If EMI barrier materials are applied to inaccessible components, then EMI protection is achieved, but installation complexity increases

Engineering Contradiction:

ImproveEMI protectionVSAvoidInstallation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The spray foam formulation provides self-service characteristics by expanding and conforming automatically after application. The material self-adheres to surfaces and self-adjusts to irregular geometries without requiring complex installation procedures, reducing installation complexity while ensuring EMI protection for inaccessible components.

Inventive Principle:

Principle #25Self-service

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 EMA spray foam effectively blocks electromagnetic interference by absorbing radiation, providing a flexible and easy-to-install solution for EMI shielding in complex or hard-to-reach areas without the need for dismantling existing devices.

Implementation Method 1

The EMA additive can be selected from graphene particles, carbon fiber, carbon nanotubes, graphite flakes, iron particles, iron oxide particles, titanium dioxide particles, ferrite particles, manganese particles, nickel particles, and cobalt particles

Methodology Applied

Scientific EffectElectromagnetic absorption: Absorption (EM radiation)

Implementation Method 2

providing a polyol blend comprising a polyol resin and an electromagnetic (EMA) additive and providing an isocyanate resin selected such that blending the isocyanate resin with the polyol blend results in an EMA spray foam

Methodology Applied

Scientific EffectPolymerization reaction: Chemical Bonding

Data Source

PatentUS12284796B2Spray foam electromagnetic interference absorber

Publication Date: 2025.04.22 INTERNATIONAL BUSINESS MACHINE CORPORATION

AI summary

A method, a device, and a composition are disclosed. The method includes providing a polyol blend that includes a polyol resin and an electromagnetic (EMA) additive, providing an isocyanate resin selected such that blending the isocyanate resin with the polyol blend results in an EMA spray foam. The device includes a first compartment containing an isocyanate resin and a second compartment containing a polyol blend, which includes a polyol resin and an EMA additive. The composition includes a polyurethane spray foam and an EMA additive blended into the polyurethane spray foam.