Conductive Polyaspartic Ester Composition for Fluid-Resistant EMI Gap Filling
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Solution Overview
Problem
Existing conductive gap fillers for electromagnetic interference (EMI) shielding in outdoor and aircraft applications suffer from inadequate resistance to environmental fluids and corrosion, limiting their effectiveness in harsh environments and low-observable aircraft.
Innovation Solution
A two-component conductive composition comprising a polyaspartic ester and isocyanate, with optional catalyst and solvent, which forms a flexible and fluid-resistant cured coating upon mixing, suitable for filling gaps and providing EMI shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conductive fillers are used for EMI shielding gaps, then DC conductivity is maximized, but resistance to environmental fluids and corrosion deteriorates
Solution Approach 1:
The invention uses a composite material system combining polyaspartic ester polymer matrix with conductive filler particles. This composite approach provides both the required electrical conductivity for EMI shielding and the chemical resistance to environmental fluids, resolving the contradiction between conductivity and corrosion resistance by integrating multiple material properties into a single composite system.
Solution Approach 2:
The invention changes the chemical composition parameters of the filler material from conventional metals to polyaspartic ester-based composites. This parameter change transforms the material properties to achieve both high DC conductivity and excellent resistance to water, oil, and other environmental fluids, simultaneously improving reliability while reducing corrosion susceptibility.
2Adaptability or versatility
If flexible conductive compositions are formulated, then adaptability to substrate movement is improved, but structural integrity may deteriorate
Solution Approach 1:
The invention employs a flexible polymer composite formulation that can accommodate substrate movement and thermal expansion while maintaining electrical continuity. The polyaspartic ester matrix provides flexibility and elasticity, allowing the conductive composition to adapt to substrate deformations without compromising structural integrity or electrical performance.
Solution Approach 2:
The composite material structure combines the flexibility of polyaspartic ester polymer with the structural support of conductive filler particles. This composite architecture maintains both flexibility for adaptability and sufficient strength for structural integrity, resolving the contradiction between these two opposing requirements.
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 offers long pot life, flexibility, and resistance to fluids, achieving low surface resistivity and hardness, making it suitable for outdoor and aircraft applications.
Implementation Method 1
A two-component conductive composition comprising a polyaspartic ester and isocyanate, with optional catalyst and solvent, which forms a flexible and fluid-resistant cured coating upon mixing
Implementation Method 2
electrically conductive filler... achieving low surface resistivity
Data Source
AI summary
A conductive composition for conductive coatings, gap fillers, caulks and fairing compounds that are useful for EMI shielding, electrical grounding, lightning strike protection, and reduced radar cross-section for low observability (LO), with improved resistance to exposure to water, oil and other fluids contains at least one aspartic ester, at least one isocyanate and a conductive filler.