Heat Conductive Sheet Structure for Acrylic Layer Adhesion
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Solution Overview
Problem
Conventional heat conductive sheets face issues with adhesion between acrylic resin layers and supporting sheets, leading to peeling and increased process complexity due to the need for priming, particularly when using PET films.
Innovation Solution
The use of a supporting sheet containing a polyvinyl acetal resin and a styrene-vinyl isoprene block copolymer improves adhesion by crosslinking with acrylic resin layers, enhancing the bonding between the layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a PET film is used as the supporting sheet, then the heat conductive resin layer can be supported, but the acrylic heat conductive resin layer easily peels away requiring additional priming processes
Solution Approach 1:
The supporting sheet uses a composite structure combining PET film base layer with a silane-modified polyethylene resin layer. This composite material approach provides both the mechanical support of PET and the adhesion benefits of silane-modified polyethylene, eliminating peeling issues without requiring additional priming processes.
Solution Approach 2:
The invention modifies the chemical composition of the supporting sheet by incorporating silane-modified polyethylene resin with specific silane group content (0.1-10 mmol/g). This parameter change in the resin composition enables direct adhesion to acrylic heat conductive resin layers without additional surface treatment or priming.
2Strength
If the supporting sheet is made from conventional materials, then manufacturing is simple, but adhesion to acrylic resin layer is poor causing peeling during use
Solution Approach 1:
The supporting sheet combines PET film with silane-modified polyethylene resin in a composite structure. This composite approach maintains manufacturing simplicity while achieving superior adhesion to acrylic heat conductive resin layers, preventing peeling during use.
Solution Approach 2:
The silane-modified polyethylene resin acts as an intermediary layer between the PET film and the acrylic heat conductive resin layer. This intermediate resin layer provides chemical compatibility and adhesion promotion, enabling strong bonding without complex manufacturing processes.
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
This configuration results in improved adhesion and reduced peeling, allowing for better handling and maintaining flexibility and thermal conductivity, suitable for precision equipment like hard disk devices and laser devices.
Implementation Method 1
a supporting sheet comprising a silane-modified polyethylene resin... adhesion between the acrylic heat conductive resin layer and the supporting sheet can be improved by silane bonds formed with acrylic monomers of the acrylic resin layer
Data Source
AI summary
A heat conductive sheet having excellent adhesion between an acrylic resin layer and a supporting sheet is provided. The heat conductive sheet includes a heat conductive resin layer including a heat conductive acrylic resin composition; and a supporting resin layer (supporting sheet) containing a polyvinyl acetal resin and a styrene-vinyl isoprene block copolymer. Crosslinking of the supporting sheet with acrylic monomers of the acrylic heat conductive resin layer enables improvements in adhesion between the heat conductive resin layer and the supporting sheet.