CNT Ceramic Paste with Silanol Silicone Binder for High-Temp Stability
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Solution Overview
Problem
Ceramic paste compositions using carbon nanotubes or carbon nanotube-metal composites face challenges in maintaining physical properties and preventing film release at high temperatures, especially above 300°C, due to issues with thermal stability and binder compatibility.
Innovation Solution
A ceramic paste composition incorporating carbon nanotubes or carbon nanotube-metal composites with a silicone adhesive containing a silanol group, a phenyl-to-methyl group mole ratio of 0.3 to 2.5, and optional organic binder, dispersant, and solvent, which facilitates dispersion and stability, allowing for the formation of a conductive film with improved heat generating and shielding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon materials are added to a ceramic binder to increase heat generating efficiency, then thermal resistance is improved, but the carbon materials are difficult to mix due to high oil absorption and hard workability, making it almost impossible to add 50 wt % or more of the carbon materials
Solution Approach 1:
The patent uses a specific binder system comprising a ceramic binder and a polymer binder in combination. The polymer binder acts as an intermediary that improves the dispersibility and workability of carbon materials while the ceramic binder provides thermal stability. This dual-binder approach enables high carbon content (50 wt% or more) to be achieved with proper mixing characteristics.
Solution Approach 2:
The patent optimizes the ratio of ceramic binder to polymer binder, as well as the specific composition and content of each binder component. By adjusting these parameters, the patent achieves a balance between workability (enabling high carbon loading) and thermal resistance (maintained through ceramic binder content).
2Ease of manufacture
If the content of the binder is increased to compensate for poor mixing of carbon materials, then physical properties and workability are improved, but conductivity is lowered
Solution Approach 1:
The patent optimizes the binder content and composition parameters to achieve a balance point where sufficient binder is present to provide workability and physical properties, but not so much that it compromises conductivity. The specific ratio of ceramic to polymer binder is tuned to maintain carbon material dispersion and conductive network formation.
Solution Approach 2:
The patent creates a composite binder system combining ceramic binder and polymer binder, where each component contributes different properties. The ceramic binder provides thermal stability and structural integrity, while the polymer binder provides workability and dispersibility, together enabling both good workability and maintained conductivity.
3Reliability
If metal oxides such as palladium and ruthenium are added to compensate for low resistance of silver, then resistance is adjusted, but the added amount of ruthenium increases the resistance of paste itself and increases power consumption
Solution Approach 1:
The patent changes the material composition parameters by incorporating carbon nanotubes or carbon materials with specific resistance characteristics. This allows adjustment of the paste resistance to appropriate levels without requiring large additions of high-resistance ruthenium, thereby reducing power consumption while achieving the desired electrical properties.
4Reliability
If a heating layer consisting of carbon materials is provided on a base layer, then heat generating capability is improved, but the coating film is easily broken or released under high temperature environment of 300° C. or more
Solution Approach 1:
The patent uses a composite binder system comprising both ceramic binder and polymer binder. The ceramic binder component provides high-temperature stability and prevents film release at 300°C or more, while the polymer binder ensures proper adhesion and flexibility. This composite approach maintains film integrity under high temperature conditions while preserving heat generating capability.
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 stable physical properties and excellent heat generating, shielding, and conducting properties at high temperatures, maintaining performance without film release, and is suitable for various applications including heat generating products and electromagnetic wave shielding.
Implementation Method 1
a heating seat manufactured using a fiber heat generator of carbon materials
Implementation Method 2
the paste does not undergo release of an electrode coated in the form of a film or degeneration of a film even at a high temperature of 300° C. or more
Implementation Method 3
a conductive film including the same
Data Source
AI summary
A ceramic paste composition including carbon nanotubes or a carbon nanotube-metal composite and a silicone adhesive, wherein the silicone adhesive includes 0.1 to 10 wt % of a silanol group, and has a mole ratio of a phenyl group to a methyl group of 0.3 to 2.5. The ceramic paste composition has low sheet resistance, through which an excellent heat generating property, and shielding, absorbing and conducting properties may be implemented in one or more embodiments. Further, though the ceramic paste composition has a very high heat generating temperature of 400° C., as compared with general paste based on carbon nanotubes, the physical properties thereof may be maintained stably. In addition, the ceramic paste may be widely used in various fields including heat generating products such as those for keeping warmth or heating, and products for electromagnetic wave shielding and absorption, electrodes, electronic circuits, antennas, and the like.