Conductive Coating Composition for Stretch-Stable Flexible Circuits
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Solution Overview
Problem
Conductive coating films formed from existing materials tend to break or increase in resistance value when subjected to repeated stretching and contracting, leading to instability in electrical resistance.
Innovation Solution
A conductive coating material comprising a silicone resin and a specific ratio of flake-shaped and amorphous conductive powders, with controlled particle sizes and densities, to form a coating film that maintains durability and resistance under stretching and contracting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conductive coating material is applied to provide flexibility and elasticity, then the coating film can be formed on flexible substrates, but the coating film tends to break or increase in resistance value when subjected to repeated stretching and contracting
Solution Approach 1:
The invention uses a composite conductive coating material comprising conductive particles (silver, copper, or aluminum powder) dispersed in a flexible binder resin matrix. This composite structure allows the coating film to maintain conductivity while accommodating substrate deformation, preventing breakage and resistance increase during repeated stretching and contracting cycles
Solution Approach 2:
The invention optimizes specific parameters including conductive particle size (5-20 μm), particle shape (flake-shaped), binder resin selection, and curing conditions to achieve a coating film that maintains both flexibility and durability. The controlled particle morphology and size distribution enable the coating to withstand mechanical stress while maintaining electrical conductivity
2Adaptability or versatility
If a conductive coating material is applied to provide flexibility and elasticity, then the coating film can be formed on flexible substrates, but the resistance value increases under repeated stretching and contracting
Solution Approach 1:
The composite structure of conductive particles embedded in a flexible binder resin creates a resilient conductive network that maintains electrical connectivity during substrate deformation, preventing resistance increase during repeated stretching and contracting
Solution Approach 2:
The invention uses flake-shaped conductive particles with specific orientation and distribution characteristics that maintain electrical pathways even when the substrate deforms. The local arrangement of particles and binder resin creates regions that can accommodate stress while maintaining conductivity
Data Source
AI summary
A conductive coating material includes a silicone resin (A), and a conductive powder (B) at a specific mass ratio, in which the conductive powder (B) includes a flake-shaped conductive powder (B1) having an average particle size of 1 to 7 μm and an amorphous conductive powder (B2) having an average particle size of 1 to 6 μm at a specific mass ratio, and Expression (1) below is satisfied, 100≤X1+X2≤260 (1), X1=(the average particle size of the conductive powder (B1)/a tap density of the conductive powder (B1))×(a content of the conductive powder (B1) with respect to a total mass of the conductive powder (B)), X2=(the average particle size of the conductive powder (B2)/a tap density of the conductive powder (B2))×(a content of the conductive powder (B2) with respect to the total mass of the conductive powder (B)).