Stretchable Conductive Paste With 3D Filler Network
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Solution Overview
Problem
Existing electrically conductive pastes are not stretchable due to high filler levels required for conductivity, limiting their extensibility.
Innovation Solution
A conductive paste comprising an elastic binder with a combination of conductive spherical, platelet-shaped, and rod-like fillers, allowing for high conductivity at low filler levels and high extensibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high filler levels are used to achieve sufficient conductivity, then electrical conductivity is improved, but extensibility deteriorates
Solution Approach 1:
The patent uses a composite filler system combining spherical, platelet-shaped, and rod-like conductive particles. This multi-morphology composite approach creates an efficient three-dimensional conductive network that achieves sufficient conductivity at lower overall filler levels (30-70 wt.%), thereby preserving the extensibility of the elastic binder (≥100% elongation).
Solution Approach 2:
Different filler morphologies serve specialized functions: spherical fillers provide conductivity and flow, platelet-shaped fillers create conductive planes, and rod-like fillers establish conductive bridges. This local functional differentiation optimizes the conductive network efficiency, reducing the total filler content needed while maintaining both conductivity and stretchability.
2Reliability
If high filler levels are used to form sufficient conducting paths, then electrical conductivity is improved, but the maximum elongation is limited
Solution Approach 1:
The synergistic combination of three filler morphologies creates a percolation network that achieves conductivity thresholds at lower filler concentrations. This composite approach allows the elastic binder to maintain its extensibility (≥100% elongation) while still providing sufficient conductive pathways.
Solution Approach 2:
The patent optimizes the size parameters of different fillers (spherical: 0.5-10 μm, platelet: specific aspect ratios, rod-like: varying lengths) to maximize conductive network efficiency. By controlling particle size distributions and morphology parameters, the system achieves effective conductivity at reduced filler levels, preserving elongation capability.
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 paste maintains conductivity while being highly extensible, adapting to deformation without loss of conductivity due to a three-dimensional network formed by the fillers.
Implementation Method 1
The paste maintains conductivity while being highly extensible, adapting to deformation without loss of conductivity due to a three-dimensional network formed by the fillers
Data Source
AI summary
The invention relates to an electrically conductive paste comprising an elastic binder (A) and a conductive filler (B), the conductive filler (B) comprising the following components: at least one conductive filler (B1) in bead form, at least one conductive filler (B2) in flake form and at least one conductive filler (B3) in tube form.