Conductive Paste Composition for Stretch-Stable Printed Wires
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Solution Overview
Problem
Conductive compositions used in wearable devices experience a rapid decrease in electric conductivity during repetitive elongations and shrinkages, leading to potential breakage, which limits their stability and usability.
Innovation Solution
Incorporation of a phenol compound represented by specific general formulae into a conductive paste composition, along with a conductive filler and elastomer resin, enhances the stability of electric conductivity during repetitive elongations and shrinkages, improving printing processability and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conductive paste composition is used, then initial electric conductivity can be achieved, but electric conductivity rapidly decreases during repetitive elongations and shrinkages
Solution Approach 1:
The patent modifies the chemical composition parameters of the conductive paste by incorporating a specific phenol compound with defined molecular structure (formula 1) containing hydroxyl group, hydrocarbon group, and optional fluorine substitutions. This parameter change in composition stabilizes the conductive network during mechanical deformation, preventing rapid conductivity loss during repetitive elongation and shrinkage cycles
Solution Approach 2:
The patent creates a composite conductive paste material combining conductive filler particles with an elastomer binder system that includes the specific phenol compound. This composite structure maintains conductive pathways through the elastomeric matrix during deformation, ensuring stable electric conductivity while providing stretchability and durability for wearable applications
2Reliability
If conductive paste composition is optimized for high conductivity, then electric conductivity increases, but printing processability deteriorates
Solution Approach 1:
The phenol compound's molecular parameters (hydroxyl group for bonding, hydrocarbon chain length, fluorine substitution patterns) are optimized to achieve a balance where the composition forms adequate conductive networks for high conductivity while maintaining appropriate viscosity and flow characteristics for good printing processability
Solution Approach 2:
The phenol compound provides localized functional groups that facilitate controlled aggregation of conductive fillers to form conductive pathways, while the overall composition maintains homogeneous distribution and appropriate rheological properties for printing. The hydroxyl groups create localized bonding sites without causing excessive aggregation that would harm printability
Data Source
AI summary
A phenol compound represented by the following general formula (1A) 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