Graphite Heat Dissipation Sheet Coating via Electrostatic Spraying
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Solution Overview
Problem
Existing methods for coating graphite heat dissipation sheets for display panels face challenges such as reduced mechanical and insulation properties, dust scattering, and complex manufacturing processes, which hinder efficient heat dissipation and increase production costs.
Innovation Solution
A method involving electrostatic spraying of a powder paint onto a graphite heat dissipation sheet, using a formulation of 80-90% epoxy resin, 10-30% polyester resin, 0.1-5% curing accelerator, and 20-30% layered clay mineral, to form a coating layer that enhances heat resistance and adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective sheet is laminated on the surface of graphite heat dissipation sheet, then mechanical properties and dust prevention are improved, but manufacturing complexity increases due to complex cutting and padding processes
Solution Approach 1:
The patent replaces the mechanical lamination system with a chemical coating system. Instead of laminating a protective sheet that requires mechanical cutting and padding operations, the invention applies a coating layer through electrostatic spraying that automatically conforms to the graphite sheet edges, eliminating the need for complex mechanical assembly processes while providing equivalent protective function
Solution Approach 2:
The patent changes the physical state of the coating material from solid sheet form to aerosol spray form. This parameter change allows the coating to be applied in a non-contact manner that automatically adapts to the graphite sheet geometry, eliminating the need for precise mechanical cutting and padding operations required by sheet lamination
2Ease of manufacture
If liquid coating agent is used for coating graphite surface, then coating formation is simplified, but drying completeness becomes difficult due to liquid component permeation into graphite surface
Solution Approach 1:
The patent changes the physical state of the coating material from liquid to powder form. This parameter change prevents permeation into the graphite surface while maintaining coating simplicity through electrostatic spraying, which atomizes the powder into a fine aerosol that uniformly coats the surface without liquid penetration issues
3Productivity
If conventional powder paint coating is used on graphite heat dissipation sheet, then non-contact coating efficiency is improved, but heat resistance deteriorates as heat generation increases
Solution Approach 1:
The patent uses a composite powder coating system consisting of epoxy resin as binder, polyester resin for adhesion, and layered clay mineral (montmorillonite) for heat resistance. This composite material structure maintains the coating efficiency of powder painting while adding thermal stability to withstand high heat generation conditions
Solution Approach 2:
The patent modifies the chemical composition parameters of the powder coating by incorporating heat-resistant inorganic materials (layered clay mineral) into the organic resin matrix. This parameter modification raises the decomposition temperature and thermal stability of the coating, enabling it to maintain protective function under high heat generation conditions
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 method improves the heat resistance and adhesiveness of the coating layer, enabling more efficient heat dissipation and extending the lifespan of the graphite heat dissipation sheet, while simplifying the manufacturing process and reducing production costs.
Implementation Method 1
coating a surface of a graphite sheet with a powder paint through electrostatic spraying
Data Source
AI summary
The present invention relates to a method for coating a graphite heat dissipation sheet, comprising a step of coating the surface of a graphite sheet with a powder paint through electrostatic spraying, thereby forming a coating layer on the surface of graphite, wherein the powder paint comprises: 80-90 parts by weight of an epoxy resin consisting of 30-40 wt % of an o-cresol novolac epoxy resin with a softening point of 70-90° C. and 60-70 wt % of a bisphenol A epoxy resin with a softening point of 110-120° C.; 10-30 parts by weight of a polyester resin containing a carboxyl group at the terminal thereof; 0.1-5 parts by weight of a curing accelerator; and 20-30 parts by weight of a layered clay mineral.