Thermally Conductive Sheet Balancing Heat Transfer and Flexibility
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Solution Overview
Problem
Conventional thermally conductive sheets face challenges in achieving a balance between high thermal conductivity, flexibility, and handling properties, with existing solutions either being too hard and inflexible or difficult to peel off without tearing.
Innovation Solution
A thermally conductive sheet with a thermal conductivity of 7 W/m·K or more, 30% compression strength of 1500 kPa or less, and tensile strength of 0.08 MPa or more, comprising a thermally conductive filler with an aspect ratio of 10 or more, oriented at an angle of 60° or more, and a resin with viscosity between 10 to 2000 Pa·s, and a thermally conductive filler content of 180 to 700 parts by mass per 100 parts by mass of resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the thermal conductivity is increased to enhance heat dissipation performance, then the thermal conductivity is improved, but the flexibility deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the aspect ratio of filler particles (using high aspect ratio fillers with ratios of 10 or more) and optimizing their orientation angle (60° or more relative to the sheet surface). This changes the geometric parameters of the filler arrangement to achieve high thermal conductivity (7 W/m·K or more) while maintaining flexibility (30% compression strength of 1500 kPa or less).
Solution Approach 2:
The patent uses composite materials by combining thermally conductive filler particles with a resin matrix in specific proportions (filler content of 180 to 700 parts by mass per 100 parts by mass of resin). This composite structure allows the material to simultaneously achieve high thermal conductivity and maintained flexibility through the resin matrix.
2Temperature
If the thermal conductivity is increased to enhance heat dissipation performance, then the thermal conductivity is improved, but the handling properties deteriorate
Solution Approach 1:
The patent changes the mechanical parameter of tensile strength to 0.08 MPa or more through optimized filler orientation and aspect ratio control, ensuring that the material maintains sufficient handling properties and resistance to rupture during peeling operations, while still achieving high thermal conductivity of 7 W/m·K or more.
Solution Approach 2:
The composite material structure with resin matrix provides toughness and damage resistance, allowing the thermally conductive sheet to be peeled off easily without tearing, thus improving handling properties while maintaining high thermal conductivity performance.
3Adaptability or versatility
If the flexibility is enhanced to improve shape followability, then the flexibility is improved, but the structural strength deteriorates
Solution Approach 1:
The patent optimizes the aspect ratio parameter of filler particles to 10 or more and controls their orientation at angles of 60° or more relative to the sheet surface. This geometric parameter optimization enables the material to achieve both high flexibility (30% compression strength of 1500 kPa or less) and adequate structural strength (tensile strength of 0.08 MPa or more).
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 solution provides a thermally conductive sheet with excellent thermal conductivity, flexibility, and handling properties, ensuring efficient heat dissipation and easy peeling without rupture.
Implementation Method 1
a thermally conductive sheet comprising a thermally conductive filler... having a thermal conductivity of 7 W/m·K or more
Data Source
Figure 1~2
AI summary
A thermally conductive sheet according to the present invention is a thermally conductive sheet comprising a thermally conductive filler, the thermally conductive sheet having a thermal conductivity of 7 W/m·K or more, a 30% compression strength of 1500 kPa or less, and a tensile strength of 0.08 MPa or more. According to the present invention, a thermally conductive sheet having excellent thermally conductive properties, flexibility, and handling properties can be provided.