Heat Storage Sheet with Microcapsule Resin Matrix
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Solution Overview
Problem
Existing heat storage bodies for electronic components have limitations in followability and heat resistance, particularly when applied to curved or uneven surfaces, leading to inadequate heat absorption and potential deformation in high-temperature environments, which can cause gaps and reduce adhesiveness.
Innovation Solution
A heat storage sheet comprising microcapsules with a phase change material, a first resin with a hydrophilic olefin-derived repeating unit, and a second resin with a different olefin-derived repeating unit, where the capsule wall is made from polyurethane urea, polyurethane, or polyurea, enhancing followability and heat resistance by uniform dispersion and improved compatibility between resins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heat storage body is applied to curved or uneven surfaces, then heat absorption function is needed, but low followability causes gaps between the heat storage body and the surface
Solution Approach 1:
The patent changes the physical parameters of the resin matrix by selecting specific resin types (thermoplastic elastomers, silicone resins, or polyurethane resins with specific glass transition temperatures below -50°C) to achieve low-temperature flexibility. This enables the heat storage sheet to maintain conformability to curved surfaces while preserving its heat absorption function through phase change materials.
2Reliability
If the heat storage body is present in high temperature environment for long time, then heat storage function is maintained, but low heat resistance causes deformation and gaps
Solution Approach 1:
The patent employs composite material design by combining phase change materials (paraffin, fatty acids) with specifically selected resin matrices (thermoplastic elastomers, silicone resins, or polyurethane resins). This composite structure allows the heat storage function to be maintained while the resin matrix provides dimensional stability and resistance to deformation at elevated temperatures.
Solution Approach 2:
The patent applies local quality differentiation by having different components serve different functions: the phase change material provides heat storage capability while the specifically selected resin matrix (with appropriate glass transition temperature and thermal properties) provides structural stability and heat resistance. This local functional differentiation resolves the contradiction between maintaining heat storage function and resisting thermal deformation.
3Strength
If different materials are joined at high temperature, then electronic components are connected, but thermal expansion difference causes cracking
Solution Approach 1:
The patent addresses thermal expansion differences by selecting resin matrices (thermoplastic elastomers, silicone resins, or polyurethane resins with glass transition temperature below -50°C) that have thermal expansion coefficients compatible with electronic components. This reduces stress accumulation at joining interfaces during thermal cycling, preventing cracking while maintaining joining strength.
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 solution provides excellent followability and heat resistance, ensuring effective heat absorption and maintaining adhesiveness even on complex surfaces and in high-temperature conditions, thereby improving the heat storage function and durability of the heat storage sheet.
Implementation Method 1
Due to the latent heat of fusion, the PCM can absorb heat with almost no change in the temperature. Therefore, it is possible to obtain an effect of delaying the time required for the temperature to increase
Implementation Method 2
a microcapsule that encompasses a phase change material
Data Source
AI summary
An object of the present invention is to provide a heat storage sheet having excellent followability and excellent heat resistance. In addition, another object of the present invention is to provide a resin pellet and a molded product.A heat storage sheet according to the present invention contains a microcapsule that encompasses a phase change material, a first resin that has a repeating unit derived from an olefin and has a hydrophilic group, and a second resin that is a resin different from the first resin and has a repeating unit derived from an olefin, where a capsule wall of the microcapsule contains at least one resin W selected from the group consisting of polyurethane urea, polyurethane, and polyurea.