Conductive Polymer Dispersion for Water and Solvent Resistant Coatings
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Solution Overview
Problem
Conductive coating films formed from existing π-conjugated conductive polymer dispersions exhibit low water resistance and solvent resistance, limiting their practical applications.
Innovation Solution
A conductive polymer dispersion comprising a π-conjugated conductive polymer, a polyanion, a polyester resin with an alkali metal salt of an acid group, and a glycidyl group-containing acrylic resin, with a specific mass ratio that enhances water and solvent resistance, is developed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a π-conjugated conductive polymer dispersion is formed using chemical oxidation polymerization with polyanions, then the dispersibility in water is improved, but the water resistance and solvent resistance of the conductive coating film deteriorates
Solution Approach 1:
The patent uses a composite binder system comprising both a polyanion (for water dispersibility) and a hydrophobic resin component (for water and solvent resistance). This composite approach allows the conductive polymer to be dispersed in water while the hydrophobic resin forms a protective matrix that resists water and solvent penetration, thereby resolving the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The patent modifies the binder composition by introducing a hydrophobic resin component with specific properties (glass transition temperature, hydrophobicity) to change the overall resistance parameters of the coating film. This parameter change allows the film to maintain both dispersibility and resistance properties.
2Reliability
If the conjugated system of the main chain of the π-conjugated conductive polymer grows, then the conductivity is improved, but the solubility in solvent deteriorates
Solution Approach 1:
The patent uses a polyanion as an intermediary agent that associates with the π-conjugated conductive polymer with large conjugated systems. The polyanion acts as a mediator that enables water dispersibility of the conductive polymer without compromising its high conductivity, thereby resolving the contradiction between conductivity and solubility.
Solution Approach 2:
The patent creates a composite system where the conductive polymer (with large conjugated system for high conductivity) is combined with polyanion and hydrophobic resin components. This composite structure allows the conductive polymer to maintain its high conductivity while the binder system provides the necessary dispersibility and processability.
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 conductive coating film formed using this dispersion demonstrates excellent water resistance and solvent resistance, making it suitable for various applications.
Implementation Method 1
in the chemical oxidation polymerization method, it is possible to manufacture a large amount of a π-conjugated conductive polymer in the solution by adding an oxidizing agent and an oxidation polymerization catalyst to a precursor monomer
Implementation Method 2
a method of solubilizing a π-conjugated conductive polymer by the addition of polyanions have been proposed
Implementation Method 3
The conductive coating film formed using this dispersion demonstrates excellent water resistance and solvent resistance
Data Source
AI summary
A conductive polymer dispersion is provided which is capable of easily forming a conductive coating film having both excellent water resistance and excellent solvent resistance.The conductive polymer dispersion of the present invention includes a π-conjugated conductive polymer, a polyanion, a polyester resin having an alkali metal salt of an acid group, and a glycidyl group-containing acrylic resin. In the conductive polymer dispersion, the ratio (α/β) of total mass α of the polyester resin and the glycidyl group-containing acrylic resin to total mass β of the π-conjugated conductive polymer and the polyanion is in a range of 6.90 to 62.5.