High-Frequency Dielectric Adhesive Sheet for Multi-Material Bonding
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Solution Overview
Problem
Existing adhesive technologies fail to provide sufficient adhesion strength when bonding adherends made of different materials using dielectric heating, particularly when the materials are not easily bondable.
Innovation Solution
A high-frequency dielectric heating adhesive sheet comprising a first and second bonding layer with specific thermoplastic resin and dielectric filler compositions, where the volume content and change rates of the thermoplastic resins in each layer are controlled to prevent interfacial peeling, and optionally includes an intermediate layer for enhanced bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-type thermal adhesive is used for bonding adherends of different materials, then the bonding process is simple, but sufficient adhesion strength cannot be obtained
Solution Approach 1:
The adhesive sheet is divided into multiple bonding layers (first bonding layer, second bonding layer, and intermediate layer), each with different thermoplastic resin compositions. This segmentation allows each layer to be optimized for bonding to specific adherend materials, thereby achieving sufficient adhesion strength for multi-material bonding while maintaining a relatively simple overall structure.
Solution Approach 2:
Each bonding layer is designed with specific local quality characteristics - the first bonding layer contains a first thermoplastic resin optimized for bonding to the first adherend, the second bonding layer contains a second thermoplastic resin optimized for bonding to the second adherend, and the intermediate layer contains both resins. This local optimization of material properties enables effective bonding of different adherend materials.
2Strength
If the volume content of thermoplastic resin in bonding layers is increased to improve adhesion strength, then bonding strength improves, but interlayer peeling resistance deteriorates
Solution Approach 1:
The invention optimizes the volume content parameters of thermoplastic resins within specific ranges (60-100% for the first thermoplastic resin in the first bonding layer, and 60-100% for the second thermoplastic resin in the second bonding layer). These parameter changes ensure sufficient adhesion strength while preventing interlayer peeling by maintaining appropriate resin distribution and avoiding excessive resin concentration that would cause peeling.
Solution Approach 2:
The adhesive sheet employs composite material structure with multiple bonding layers having different thermoplastic resin compositions. The first bonding layer and second bonding layer are composed of different thermoplastic resins, and the intermediate layer contains both types of resins, creating a composite structure that simultaneously achieves high adhesion strength and interlayer peeling resistance through synergistic material combination.
3Adaptability or versatility
If different thermoplastic resins are used in first and second bonding layers to bond different adherends, then bonding effectiveness to different materials improves, but manufacturing complexity increases
Solution Approach 1:
The adhesive sheet is segmented into functionally distinct bonding layers - the first bonding layer with first thermoplastic resin for bonding to first adherend, the second bonding layer with second thermoplastic resin for bonding to second adherend, and an intermediate layer with both resins. This segmentation enables targeted material selection for each bonding interface, improving versatility for bonding different materials while maintaining a relatively simple overall structure.
Solution Approach 2:
The intermediate layer serves multiple functions by containing both first and second thermoplastic resins - it acts as a transition zone between the two different bonding layers, provides additional bonding pathways for both adherend types, and ensures interlayer adhesion. This multi-functionality reduces the need for additional specialized layers, thereby managing structural 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 adhesive sheet effectively bonds adherends of different materials together with high adhesion strength and resistance to interlayer peeling, facilitating efficient and durable bonding using high-frequency dielectric heating.
Implementation Method 1
a first dielectric filler that generates heat under application of a high-frequency wave
Data Source
AI summary
A high-frequency dielectric heating adhesive sheet includes: a first bonding layer containing a first thermoplastic resin and a first dielectric filler; and a second bonding layer containing a second thermoplastic resin and a second dielectric filler. A volume content VA1 of the first thermoplastic resin in the first bonding layer and a volume content VA2 of the second thermoplastic resin in the second bonding layer are in a range from 60% by volume to 100% by volume. Change rates Vx1 and Vx2 represented by formulas below are less than 80%. VB1 is the volume content of the first thermoplastic resin in a layer in direct contact with the first bonding layer, and VB2 is the volume content of the second thermoplastic resin in a layer in direct contact with the second bonding layer. (Formula 1): Vx1={(VA1−VB1)/VA1}×100 (Formula 2): Vx2={(VA2−VB2)/VA2}×100