Aqueous Conductive Coating with Low MW Epoxy Resin
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Solution Overview
Problem
Existing aqueous conductive coatings face challenges in suspending large quantities of conductive fillers and dispersing resins to form robust, highly conductive coatings, often resulting in poor cohesion or high costs due to high filler loading.
Innovation Solution
An aqueous composition comprising a resin with a molecular weight of less than 800 Daltons, a curative, a surfactant, and a filler, where the resin is predominantly an unmodified epoxy or surfactant-modified epoxy, and the surfactant is selected to balance polar and non-polar forces, allowing for stable dispersion and self-assembly of fillers into conductive pathways during curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large quantities of conductive filler are suspended in an aqueous medium, then conductivity is improved, but cohesion and stability deteriorate
Solution Approach 1:
The patent uses a specifically formulated aqueous resin system as an intermediary medium that enables the suspension of conductive filler particles while maintaining coating cohesion. The resin acts as a bridge between the filler particles and the aqueous environment, allowing high filler loading (improving conductivity) without sacrificing the structural integrity and stability of the coating.
Solution Approach 2:
The patent modifies key parameters of the aqueous system including resin molecular weight, surfactant selection and concentration, and pH levels to optimize the balance between filler suspension and coating cohesion. By carefully controlling these parameters, the system achieves high conductivity with stable, cohesive coating formation.
2Reliability
If high filler loading is used to achieve high conductivity, then conductivity is improved, but cost and processing difficulty increase
Solution Approach 1:
The patent performs preliminary dispersion of conductive filler particles in the aqueous resin system before final coating application. This pre-dispersion step ensures uniform distribution of filler particles, preventing agglomeration and reducing processing difficulties during coating formation and curing, while maintaining high conductivity.
Solution Approach 2:
The aqueous resin system serves as an intermediary vehicle that facilitates easy processing and application of high filler loadings. The resin matrix enables smooth flow and uniform distribution of the conductive filler, making the high-fillersystem easy to manufacture and apply despite the high solid content.
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 achieves high conductivity with a filler content of 2% by volume, providing a cost-effective and cohesive conductive coating suitable for applications like electrostatic dissipation and lightning strike protection, while minimizing filler loading to reduce costs.
Implementation Method 1
This requires selecting the appropriate type(s) and amount(s) of surfactant capable of dealing with materials of high, medium, and low polarity and in some cases dispersing the individual ingredients in a specific order.
Implementation Method 2
the surfactant is selected to balance polar and non-polar forces, allowing for stable dispersion and self-assembly of fillers into conductive pathways during curing
Data Source
AI summary
An aqueous composition is provided comprising a resin, a curative, a filler, a surfactant, and water; wherein the resin comprises an average molecular weight of less than about 800 Daltons and comprises at least 50 weight percent of at least one of: (a) an unmodified epoxy or phenoxy resin, or (b) a surfactant-modified epoxy or phenoxy resin. This composition, applied to a substrate and dried, can then be cured so as to thermoset the resin and self-assemble to form continuous pathways of filler within the resin matrix.