Conductive Elastomer Reactive Topcoat Thinning
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Solution Overview
Problem
Existing methods for applying conductive coatings to silicone rubber, such as spray coating with silver flakes, rely on volatile organic compounds (VOCs) that are hazardous and do not promote effective bonding or flexibility, and are not suitable for irregular surfaces.
Innovation Solution
A method using reactive top coats to thin conductive ink, eliminating the need for VOCs, which allows for improved bonding and flexibility by spraying the thinned ink onto silicone substrates, specifically using a mixture of liquid silicone rubber topcoats with silver paste, and curing to form a conductive elastomer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If VOCs are used to thin conductive ink for spray coating, then the ink can be applied to substrates, but hazardous emissions occur and bonding to substrate is poor
Solution Approach 1:
The patent changes the chemical composition parameter of the thinning agent from VOC-based solvents to silicone oil-based carriers. This substitution eliminates hazardous hydrocarbon emissions while improving substrate bonding through silicone-silicone compatibility. The conductive ink formulation is modified to use silicone oil as the continuous phase, allowing spray application without toxic solvents.
Solution Approach 2:
The patent converts the previously harmful VOC solvents into beneficial silicone oil carriers. Silicone oil provides both the necessary fluidity for spray application and inherent bonding compatibility with silicone rubber substrates. The harmful hydrocarbon emissions are replaced with non-toxic, environmentally friendly silicone-based chemistry that actually enhances adhesion.
2Ease of manufacture
If traditional spray coating methods are used, then conductive coating can be applied, but substrate flexibility is reduced
Solution Approach 1:
The patent changes the chemical compatibility parameter by using silicone oil-based conductive ink formulations that match the silicone rubber substrate chemistry. This chemical compatibility ensures that the cured coating remains flexible and elastomeric rather than becoming rigid. The silicone-silicone bonding creates a coating that moves and flexes with the substrate without cracking or delaminating.
3Area of stationary object
If conductive coating is applied to irregular surfaces, then coverage is achieved, but uniform bonding is difficult
Solution Approach 1:
The patent employs spray application technology that uses pneumatic atomization to deliver the conductive ink formulation. The spray process allows the coating material to be deposited as a fine mist that can conform to irregular surface geometries. The silicone oil-based formulation maintains proper flow and bonding characteristics even on complex three-dimensional surfaces, ensuring uniform adhesion across varying topographies.
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 method reduces hazardous emissions, enhances bonding between the conductive layer and substrate, maintains substrate flexibility, and allows for targeted conductivity on irregular surfaces without hydrocarbon off-gassing, resulting in a highly conductive and flexible coating.
Implementation Method 1
The method comprises the use of reactive top coats formulated for use with silicone rather than solvents to achieve thinning of the conductive ink
Implementation Method 2
The thinned ink may then be spray coated onto silicone elements to provide a conductive layer that is bonded to the silicone
Implementation Method 3
improves bonding between the conductive ink and substrate
Data Source
AI summary
A method for forming a conductive elastomer by applying or spray coating a conductive paste onto an elastomeric substrate using a reactive top coat to thin the conductive paste prior to spraying onto the substrate. The use of a reactive topcoat to thin the conductive paste avoids the need for hazardous volatile organic components as solvents to thin the conduct paste and improves the bonding of the conductive paste to the elastomeric substrate once the spray coating is cured.