Thermally Conductive Potting Composition with Metal Complex Mediator
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Solution Overview
Problem
Traditional thermally conductive potting compositions experience filler sedimentation during storage and poor flowability after mixing, making it difficult to effectively encapsulate sensitive electrical components.
Innovation Solution
A thermally conductive potting composition comprising a first part with epoxy resin, thermally conductive fillers, and a metal complex with a specific organic ligand, and a second part with an epoxy curing agent, which minimizes filler sedimentation during storage and ensures good flowability upon mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fumed silica is added to the potting composition to prevent filler sedimentation, then filler sedimentation is reduced, but flowability deteriorates making potting processing difficult
Solution Approach 1:
The patent introduces a metal complex as an intermediary substance that mediates between the thermally conductive filler particles and the resin matrix. This metal complex acts as a bridge, preventing filler sedimentation through its coordinating bonds while maintaining good flowability by not forming strong cross-linked structures during storage. The metal complex serves as a temporary mediator that resolves the contradiction between stability and ease of operation.
Solution Approach 2:
The patent changes the chemical parameters of the potting composition by introducing a metal complex with specific ligands that can coordinate with both the filler particles and the resin. This parameter change allows the system to achieve high thixotropic index for storage stability while maintaining low thixotropic index after mixing for good flowability. The metal complex modifies the rheological parameters dynamically.
2Temperature
If thermally conductive fillers are incorporated into the potting composition to enhance thermal conductivity, then thermal conductivity is improved, but filler sedimentation occurs during storage
Solution Approach 1:
The metal complex serves as an intermediary that prevents filler sedimentation by forming coordinating bonds with the thermally conductive filler particles. This keeps the fillers suspended in the resin matrix during storage while maintaining the thermal conductivity enhancement. The metal complex acts as a stabilizing agent that prevents the harmful sedimentation effect.
Solution Approach 2:
The patent creates a composite material system comprising epoxy resin, thermally conductive filler, and metal complex. This composite structure leverages the thermal conductivity of the filler while the metal complex provides stabilization. The composite approach allows simultaneous achievement of thermal management and storage stability.
3Stability of the object's composition
If the potting composition is designed to have high thixotropic index for easy storage, then storage stability is improved, but flowability during potting process deteriorates
Solution Approach 1:
The patent introduces dynamic thixotropic behavior through the metal complex that allows the composition to transition between high viscosity during storage and low viscosity during application. The metal complex coordinates with filler particles to create a gel structure for storage stability, but this structure breaks down when mixed with curing agent, providing good flowability for potting. The system dynamically adjusts its rheological properties.
Solution Approach 2:
The metal complex enables the potting composition to exhibit different thixotropic indices at different stages: high thixotropic index during storage for stability, and low thixotropic index after mixing for good flowability. This parameter change allows the same composition to satisfy both storage and processing requirements.
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 exhibits no or little filler sedimentation during storage and maintains good flowability after mixing, facilitating easier processing and effective encapsulation of sensitive components.
Implementation Method 1
the metal complex has one organic ligand represented by the following general formula (1) which is coordinatively bounded to a metal atom in the metal complex
Implementation Method 2
at least one thermally conductive filler
Implementation Method 3
a first part comprising at least one epoxy resin; at least one thermally conductive filler; and at least one metal complex; and a second part comprising at least one curing agent
Data Source
AI summary
Provided is a thermally conductive potting composition, comprising a first part comprising at least one epoxy resin; at least one thermally conductive filler; and at least one metal complex; and a second part comprising at least one curing agent. The first part of the thermally conductive potting composition exhibits high thixotropic index and therefore the first part is easily stored. After the first part and the second part is mixed, the thermally conductive potting composition exhibits low thixotropic index and the meets the requirement for potting process.