Conductive Paste Composition for Stretchable Wires With Stable Conductivity
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Solution Overview
Problem
Conductive wires made from stretchable conductive compositions experience a rapid decrease in electric conductivity upon repetitive elongation and shrinkage, or may break, necessitating a composition that maintains stability and conductivity.
Innovation Solution
A conductive paste composition incorporating a phenol compound represented by general formula (1A) or (1B), combined with a conductive filler, an elastomer resin, and a solvent, which enhances printing processability and maintains electric conductivity during elongation and shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If stretchable conductive composition is used to make conductive wires, then the wire has stretchability and flexibility, but the electric conductivity decreases rapidly upon repetitive elongation and shrinkage
Solution Approach 1:
The patent uses a composite material system consisting of conductive particles (silver, copper, or carbon), elastomer binder (silicone rubber or polyurethane), and the specific phenol compound additive. This composite structure allows the wire to maintain both stretchability from the elastomer and stable conductivity through the synergistic effect of the phenol compound preventing particle separation and oxidation during repetitive deformation.
Solution Approach 2:
The patent optimizes specific parameters including the phenol compound content (0.1-10 wt% of total composition), conductive particle size (1-100 μm), and elastomer crosslinking density. These parameter adjustments ensure that the conductive network remains stable during stretching while maintaining sufficient elasticity for repeated deformation without conductivity degradation.
2Length of moving object
If the wire is made thinner to be less visible, then the design becomes more flexible and aesthetic, but the electric conductivity decreases
Solution Approach 1:
The patent creates a localized high-concentration conductive network within the thin wire structure by optimizing the distribution and concentration of conductive particles in specific regions. The phenol compound ensures these localized conductive pathways remain stable during deformation, allowing thin wires to maintain sufficient conductivity despite reduced cross-sectional area.
3Ease of manufacture
If conventional conductive paste is used, then the manufacturing process is simple, but the printing processability is poor and conductivity stability is insufficient
Solution Approach 1:
The phenol compound acts as an intermediary substance between the conductive particles and elastomer binder. It improves the rheological properties of the paste for better printing processability while simultaneously preventing particle aggregation and oxidation, thereby ensuring conductivity stability. The phenol compound mediates the interaction between components to achieve both printability and reliability.
Data Source
AI summary
The present invention is a phenol compound represented by the following general formula (1A). This phenol compound makes it possible to provide a phenol compound as an additive for a conductive paste composition having a small decrease in electric conductivity in repetitive elongations and shrinkages and excellent printing processability, a conductive paste composition containing the additive, and a conductive wire made by using the conductive paste composition.