Adhesive Sheet With Ruptured Hollow Microspheres
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Solution Overview
Problem
Conventional thermally conductive adhesives face challenges in achieving high thermal conductivity while maintaining softness and flexibility, with issues such as increased hardness, non-uniform foam cell size and distribution, and poor cohesion due to low molecular weight compounds, which affect bonding area and durability.
Innovation Solution
An adhesive sheet is prepared by dispersing hollow polymeric microspheres in an acrylic polymer, curing the mixture, and then rupturing the microspheres to form hollow parts, which improves flexibility, bonding area, and thermal conductivity, while allowing for controlled size and distribution of foam cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hollow polymeric microspheres are dispersed in a crosslinked adhesive sheet, then restorative power upon compression is improved, but hardness of the adhesive sheet increases
Solution Approach 1:
The patent changes the physical state of the hollow microspheres from intact to ruptured. By rupturing the hollow microspheres after curing, the adhesive sheet transforms from having discrete spherical cavities to having expanded foam-like structures, which fundamentally alters the mechanical response from elastic recovery to energy absorption through deformation
2Stress or pressure
If foam structure is introduced to soften adhesive sheet, then hardness is reduced, but noise and vibration reduction capability is improved
Solution Approach 1:
The patent introduces a porous foam structure by rupturing hollow microspheres within the adhesive matrix. This porous structure reduces hardness by creating void spaces that decrease material density and stiffness, while simultaneously providing noise and vibration reduction through sound absorption and damping mechanisms inherent to foam structures
3Productivity
If thermal treatment is used to cure and foam adhesive simultaneously, then size and distribution of foam cells become non-uniform, but production efficiency is improved
Solution Approach 1:
The patent separates the curing process from the foaming process. Curing is completed first to establish the adhesive matrix, then hollow microspheres are ruptured in a subsequent step to create uniform foam cells. This sequential approach allows each process to be optimized independently, ensuring uniform foam cell distribution while maintaining production efficiency
4Productivity
If bonding area is increased to improve heat transfer, then efficiency of heat transfer is improved, but irregular loci between electronic parts and adhesive create air layers that reduce bonding area
Solution Approach 1:
The patent creates a dynamic foam structure that can deform and flow to fill irregular spaces between electronic parts and substrates. The ruptured hollow microspheres create a compliant adhesive that adapts to surface irregularities, eliminating air pockets and maximizing actual bonding area while maintaining high heat transfer efficiency
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 resulting adhesive sheet exhibits enhanced flexibility, increased bonding area, improved adhesive force, and durability at high temperatures, with improved thermal conductivity and noise reduction, making it suitable for electronic components.
Implementation Method 1
hollow parts formed by rupturing hollow microspheres in cured resins
Implementation Method 2
thermally conductive adhesives function to transfer the heat generated from electronic parts to a heat sink for discharging heat
Data Source
AI summary
Disclosed herein are an adhesive sheet comprising a cured acrylic polymer, hollow polymeric microspheres dispersed and ruptured in the cured acrylic polymer, and hollow parts formed by rupturing the hollow polymeric microspheres dispersed in the cured acrylic polymer, and a preparation method thereof.