Hot-Melt Organopolysiloxane Electrode Coating for Peel-Resistant Transducers
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Solution Overview
Problem
Conventional electrode-forming compositions are limited to liquid or solvent-based processes, leading to non-uniformity and poor viscoelasticity in electrode layers, especially when applied to transducers with significant physical displacement, and lack suitability for solvent-free processes that reduce environmental impact and improve performance.
Innovation Solution
A hot-melt electrode layer-forming organopolysiloxane composition comprising linear organopolysiloxane, high molecular weight organopolysiloxane resin, and conductive fine particles, which is non-fluid at room temperature and heat-meltable, allowing for solvent-free application and forming an electrode layer with excellent viscoelasticity, adhesion, and conformability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If liquid or solvent-based electrode-forming compositions are used, then the composition can be applied to form an electrode layer, but the electrode layer exhibits non-uniformity and poor viscoelasticity especially when applied to transducers with significant physical displacement
Solution Approach 1:
The patent changes the physical state parameter of the electrode-forming composition from liquid/solvent-based to solid hot-melt type. This parameter change fundamentally resolves the contradiction by providing both uniform application (through controlled melting and spreading) and excellent viscoelasticity (through the elastic nature of cured polysiloxane), especially under physical displacement conditions.
Solution Approach 2:
The patent uses a composite material system consisting of conductive filler particles dispersed in a curable organopolysiloxane composition. This composite structure provides both the conductivity needed for electrode function and the viscoelastic properties of polysiloxane, resolving the contradiction between uniformity and reliability.
2Ease of manufacture
If liquid electrode-forming compositions are used, then the composition can be applied by coating processes, but the composition lacks suitability for solvent-free processes that reduce environmental impact and improve performance
Solution Approach 1:
The patent changes the composition form from liquid to solid hot-melt type, enabling solvent-free processing. The composition melts at elevated temperatures for application and then cures to form the electrode layer, providing adaptability to environmentally friendly solvent-free processes while maintaining ease of manufacture through controlled melting and spreading.
Solution Approach 2:
The patent utilizes phase transition (melting and solidification) of the hot-melt composition as the core mechanism for solvent-free application. The composition transitions from solid to liquid state during application, then cures to form the final electrode layer, enabling versatility in solvent-free processes.
3Ease of manufacture
If conventional liquid compositions are used, then the composition can be applied to form an electrode layer, but the composition exhibits poor handling properties in terms of transportation, use and storage stability
Solution Approach 1:
The patent changes the physical state from liquid to solid, fundamentally improving handling properties. The solid hot-melt composition can be stored and transported without solvent-related stability issues, then melted and applied when needed, providing both ease of manufacture and excellent ease of operation.
Solution Approach 2:
The patent extracts the solvent component from the electrode-forming composition, eliminating the associated handling and storage problems. The solvent-free hot-melt composition maintains all necessary functionality while removing the source of handling difficulties.
4Reliability
If electrode layer is formed on electroactive film with displacement, then the electrode layer can function on transducers, but interface peeling occurs leading to inferior current flow and reduced reliability
Solution Approach 1:
The patent uses a composite material system where conductive filler is dispersed in curable organopolysiloxane, creating an electrode layer that adheres strongly to the electroactive film while maintaining flexibility to accommodate displacement, thus preventing interface peeling and ensuring reliable current flow.
Solution Approach 2:
The patent changes the composition from liquid to solid hot-melt type with specific molecular weight requirements (polystyrene equivalent weight average molecular weight of 5,000 or more), creating an electrode layer with optimal adhesion strength and elasticity to prevent peeling during transducer operation.
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 enables uniform electrode layers with high heat resistance, durability, and shape retention, reducing interfacial peeling and ensuring reliable performance in transducers with significant physical displacement.
Implementation Method 1
the composition itself is non-fluid to solid and therefore has excellent handling properties and storage stability, can be applied by a heat-melting (hot-melt) process
Implementation Method 2
an electrode layer must be provided on an electroactive film serving as a dielectric layer
Data Source
AI summary
Provided is an electrode layer-forming composition, a laminate body, uses thereof, and a production method thereof, which can form an electrode layer having viscoelastic properties sufficient for practical use, which can be coated with a hot-melt process, which has excellent adhesion to a dielectric layer, conformability, and shape retention properties to the resulting electrode layer, and which is unlikely to cause problems such as peeling or defects in the electrode layer even when used in a transducer. A hot-melt electrode layer-forming organopolysiloxane composition contains: (A) a linear organopolysiloxane; (B) an MQ type organopolysiloxane resin having a weight average molecular weight of 5000 or more in terms of a polystyrene standard; and (E) conductive fine particles. The composition is non-fluid at 25° C. and has heat melting properties. The amount of component (B) in the composition is 45 mass % or more relative to the entire composition.