Thixotropic Thermosetting Resin Composition for Smooth PCB Insulation
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Solution Overview
Problem
Existing thermosetting resin compositions struggle to achieve both high thermal conductivity and dielectric breakdown resistance while maintaining surface smoothness, leading to inadequate cooling efficiency and increased manufacturing costs.
Innovation Solution
A thermosetting resin composition containing a thermosetting resin, a thermally conductive filler, a rheology modifier, and a wet dispersant, with a thixotropic index adjusted to 0.9 or more and less than 1.0, to enhance thermal conductivity, dielectric breakdown resistance, and surface smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the insulating layer is highly filled with thermally conductive filler to improve thermal conductivity, then thermal conductivity is improved, but dielectric breakdown resistance decreases and surface irregularities are formed
Solution Approach 1:
The patent optimizes the particle diameter ratio of thermally conductive filler to a specific range (0.05 to 0.5) to achieve both high thermal conductivity and high dielectric breakdown resistance. This parameter optimization resolves the contradiction by finding the optimal filler size that balances thermal conduction efficiency with electrical insulation performance.
Solution Approach 2:
The patent uses a composite resin system combining epoxy resin and phenolic resin in specific ratios, along with optimized thermally conductive filler, to create a material that simultaneously achieves high thermal conductivity, high dielectric breakdown resistance, and good surface smoothness.
2Temperature
If the insulating layer is highly filled with thermally conductive filler to improve thermal conductivity, then thermal conductivity is improved, but surface smoothness deteriorates and contact with housing is impaired
Solution Approach 1:
The patent optimizes the particle diameter ratio of thermally conductive filler to a specific range (0.05 to 0.5) to achieve both high thermal conductivity and good surface smoothness. This parameter optimization prevents excessive surface irregularities while maintaining effective thermal conduction pathways.
Solution Approach 2:
The patent applies different particle sizes of thermally conductive filler to create a hierarchical structure where smaller particles fill gaps between larger particles, improving both thermal conductivity and surface smoothness by optimizing the local distribution of filler materials.
3Shape
If thermally conductive material is applied to irregular portions to fill and smooth the surface, then surface smoothness is improved, but manufacturing cost increases and thermal resistance increases
Solution Approach 1:
The patent eliminates the need for separate surface filling operations by incorporating surface-smoothing functionality directly into the insulating layer composition itself. The optimized resin and filler combination provides inherent surface smoothness, removing the need for additional thermally conductive filling materials and reducing manufacturing complexity.
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 thermal conductivity and dielectric breakdown resistance, ensuring efficient cooling and improved surface contact with cooling environments, while maintaining smoothness and reducing manufacturing costs.
Implementation Method 1
a thixotropic index at 25°C adjusted to 0.9 or more and less than 1.0
Implementation Method 2
thermal conductivity
Implementation Method 3
cured product of the thermosetting resin composition
Data Source
AI summary
Provided is a thermosetting resin composition capable of achieving both thermal conductivity and dielectric breakdown resistance at high levels and forming a cured product with a surface having high smoothness. In a thermosetting resin composition, a thermosetting resin, a thermally conductive filler, a rheology modifier, and a wet dispersant are mixed to be solvent-free, and a thixotropic index at 25°C is adjusted to 0.9 or more and less than 1.0.