Conductive Composition for Antistatic Coatings and Capacitors
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Solution Overview
Problem
Current methods for producing π conjugated conductive polymers face challenges such as low solubility, conductivity, and stability, particularly in chemical oxidative polymerization, which results in insoluble powders and amorphous structures, making it difficult to achieve high conductivity and flexibility in antistatic coatings and capacitors.
Innovation Solution
A conductive composition comprising a π conjugated conductive polymer, a polyanion, and a hydroxy group-containing aromatic compound, along with a binder resin, is used, where the hydroxy group-containing aromatic compound enhances conductivity and stability, and the ultrafiltration method is employed to remove free ions, allowing for the formation of a uniform and conductive film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical oxidative polymerization is used to produce π conjugated conductive polymer, then large amount of polymer can be produced in solution, but the polymer becomes insoluble solid powder and forms amorphous block with low conductivity
Solution Approach 1:
The patent changes the chemical structure parameters of the polymer by introducing specific side chains (alkyl groups with 4-20 carbon atoms) to modify solubility and crystallinity properties. This allows the polymer to maintain conductivity while being processable in solution form, resolving the contradiction between production amount and conductivity reliability
Solution Approach 2:
The patent creates a composite system by combining the π conjugated conductive polymer with specific solvents and additives that enhance both solubility and conductivity. The composite approach allows the polymer to be produced in solution form while maintaining high conductivity, addressing both productivity and reliability requirements
2Reliability
If π conjugated conductive polymer is used in antistatic coating, then conductivity is improved, but flexibility and adhesion to base are insufficient
Solution Approach 1:
The patent modifies the polymer's physical parameters by controlling molecular weight and side chain structure to achieve optimal balance between conductivity, flexibility, and adhesion. The specific alkyl chain length (4-20 carbon atoms) is optimized to provide both conductive properties and mechanical flexibility for coating applications
Solution Approach 2:
The patent introduces binder resins as intermediary materials that facilitate adhesion between the conductive polymer and the base substrate. The binder resin acts as a mediator that maintains the polymer's conductive properties while providing the necessary mechanical bonding and flexibility for the coating
3Manufacturing precision
If electrolytic polymerization method is used, then film can be formed on base, but mass production is very difficult
Solution Approach 1:
The patent replaces the electrolytic polymerization method (which requires complex electrical systems and electrode setups) with chemical oxidative polymerization. This substitution enables bulk solution-phase synthesis that is much more suitable for mass production while still allowing film formation through subsequent coating processes
Solution Approach 2:
The patent performs preliminary polymerization in solution phase to create a conductive polymer solution before applying it to the base as a film. This preliminary action separates the polymerization process from the film formation process, enabling mass production of the polymer material that can then be efficiently coated into films
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 solution achieves high conductivity, flexibility, and adhesion to bases, providing stable antistatic coatings and capacitors with improved heat resistance and reduced equivalent series resistance.
Implementation Method 1
π conjugated conductive polymers are known as organic conductive materials. The π conjugated conductive polymers is generally referred to an organic polymer composed of the main chain of a conjugated system
Implementation Method 2
there are no such limitations on the chemical oxidative polymerization method. A large amount of a π conjugated conductive polymer can be produced in a solution by adding oxidant and oxidation polymerization catalysis to precursor monomers
Data Source
AI summary
A conductive composition comprises a π conjugated conductive polymer, a polyanion, and a hydroxy group-containing aromatic compound containing two or more hydroxy groups. An antistatic coating material comprises the conductive composition and a solvent. An antistatic coating is produced by applying the antistatic coating material. A capacitor comprises an anode composed of a porous valve metal body; a dielectric layer formed by oxidizing a surface of the anode; and a cathode formed on the dielectric layer, wherein the cathode has a solid electrolyte layer comprising the conductive composition.