Polyester Film Thermal Conductivity via Composite Layering
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Solution Overview
Problem
Conventional polyester films lack sufficient thermal conductivity and mechanical properties to effectively manage heat dissipation in high-performance electronic components and wind power generators, leading to reduced efficiency and increased power consumption.
Innovation Solution
A polyester film with a layer containing crystalline polyester and plate-like or needle-like particles with an aspect ratio of 2 or more, where the particles are surface-treated with reactive substituents to enhance bonding with the polyester, resulting in improved thermal conductivity and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If graphite sheet is used to improve thermal conductivity, then thermal conductive rate is improved, but mechanical properties deteriorate due to brittleness
Solution Approach 1:
The patent creates a composite film by laminating PET film onto graphite sheet, combining the excellent thermal conductivity of graphite with the mechanical strength and flexibility of PET. This composite structure resolves the contradiction by allowing the graphite to provide heat dissipation while the PET layer provides structural integrity and prevents brittleness issues.
Solution Approach 2:
The invention applies different materials to different layers of the film structure - graphite sheet for thermal conduction function and PET film for mechanical protection. Each layer performs its specialized function locally, with the graphite layer handling heat transfer and the PET layer handling mechanical stress, thus resolving the property trade-off.
2Strength
If PET film is used as protective layer to improve mechanical properties, then mechanical strength is improved, but thermal conductivity deteriorates due to low thermal conductive rate
Solution Approach 1:
The patent creates a composite film by laminating PET film onto graphite sheet, combining the excellent thermal conductivity of graphite with the mechanical strength and flexibility of PET. This composite structure resolves the contradiction by allowing the graphite to provide heat dissipation while the PET layer provides structural integrity and prevents brittleness issues.
Solution Approach 2:
The invention applies different materials to different layers of the film structure - graphite sheet for thermal conduction function and PET film for mechanical protection. Each layer performs its specialized function locally, with the graphite layer handling heat transfer and the PET layer handling mechanical stress, thus resolving the property trade-off.
3Use of energy by stationary object
If composite film with graphite sheet is used to improve thermal conductivity, then thermal conductive rate is improved, but film thickness increases
Solution Approach 1:
The patent uses thin film structures where the PET film is laminated onto the graphite sheet in a thin-layer configuration. This approach maintains compact thickness while achieving effective thermal conduction through the graphite layer, resolving the contradiction between thermal performance and dimensional constraints.
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 film exhibits excellent electrical insulating properties, thermal conductivity, and mechanical properties, enabling efficient heat dissipation and reduced power consumption in applications such as wind power generators and high-performance electronic components.
Implementation Method 1
films having excellent thermal conductivity are demanded and various materials have been proposed... the P layer is stretched in at least one axial direction and the Young's modulus of the polyester film is 2 GPa or more... the film exhibits excellent electrical insulating properties, thermal conductivity, and mechanical properties, enabling efficient heat dissipation
Data Source
Figure 1
AI summary
A polyester film provided with a layer (a P layer) that contains a crystalline polyester (A) and also contains plate-like particles (b1) each having an aspect ratio of 2 or more and/or needle-like particle (b2) each having an aspect ratio of 2 or more, wherein the Young' s modulus of the polyester film is 2 GPa or more and the values of Wb and V/Wb are 10 or more and 1 or less,respectively,wherein Wb (% by mass) represents the total content of the plate-like particles (b1) each having an aspect ratio of 2 or more and the needle-like particles (b2) each having an aspect ratio of 2 or more in the P layer, and V (% by volume) represents the porosity in the P layer. Provides is a polyester film having excellent electrical insulation properties, heat conductivity and mechanical properties. Using the polyester film, there are provided: an electrical insulation sheet and an adhesive tape each having high and excellent heat conductivity; and a wind power generator, an electronic device and the like each manufactured using the electrical insulation sheet or the adhesive tape.