Heat Storage Composite Material with High Thermal Conductivity
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Solution Overview
Problem
Conventional heat storage materials have low thermal conductivity, leading to slow response times and leakage issues, especially when used in high-power devices, limiting their application due to competition with heat dissipation materials.
Innovation Solution
A heat storage composite material comprising 30-55 parts organic phase change material, 30-40 parts two-dimensional thermally conductive carbon material, 10-20 parts lamellar structure graphite, and 0-10 parts oil-absorbing organic resin, with specific particle sizes and compositions, and a preparation method involving adsorption, mixing, and lamination treatments to achieve high thermal conductivity and prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional heat storage material is used, then heat storage capacity is maintained, but thermal conductivity remains low (0.1 w/(m·k)) causing slow response time
Solution Approach 1:
The patent creates a composite material system combining phase change material (heat storage) with thermally conductive carbon materials (thermal transmission). This composite structure allows the material to simultaneously achieve high thermal conductivity for fast response and adequate heat storage capacity, resolving the contradiction between speed and reliability.
2Reliability
If thermally expanded graphite is added to improve thermal conductivity, then thermal conductivity increases, but the material becomes prone to leakage requiring anti-leakage devices
Solution Approach 1:
The patent uses small-sized two-dimensional carbon materials (particle size <80 μm) that can be uniformly distributed throughout the phase change material matrix. This local uniform distribution provides thermal conductivity enhancement without creating the localized stress concentrations and structural weaknesses that cause leakage in conventionally expanded graphite, eliminating the need for anti-leakage devices.
3Reliability
If high lamination density is used to achieve high thermal conductivity, then thermal conductivity improves, but the material is mainly in block form reducing flexibility
Solution Approach 1:
The patent changes the particle size parameter of the carbon materials to <80 μm, which allows for effective thermal conductivity enhancement at lower lamination densities. This parameter change enables the material to be processed into flexible forms while maintaining high thermal conductivity, resolving the contradiction between reliability and adaptability.
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 composite material achieves high thermal conductivity and reduced leakage, enabling effective heat storage and dissipation while maintaining processability, with thermal conductivity exceeding 20 w/(m·k) and passing anti-leakage tests.
Implementation Method 1
organic phase change material
Implementation Method 2
The organic phase change material comprises one or more of n-alkane C18-C22, paraffinic alkane C18-C30, and stearic acid C18-C22
Implementation Method 3
two-dimensional thermally conductive carbon material
Implementation Method 4
performing a melting treatment to make the organic phase-change material to be adsorbed in gaps of the two-dimensional carbon material
Data Source
AI summary
A heat storage composite material comprises components by weight: 30-55 parts of organic phase change material, 30-40 parts of two-dimensional thermally conductive carbon material, 10-20 parts of lamellar structure graphite, and 0-10 parts of oil-absorbing organic resin. A preparing method include steps of stirring the organic phase change material to disperse on a surface of the two-dimensional thermally conductive carbon material, and melting them so the organic phase-change material is adsorbed in gaps of the two-dimensional thermally conductive carbon material; stirring and mixing the lamellar structure graphite and the two-dimensional thermally conductive carbon material adsorbed with the organic phase change material in a mixer to obtain a mixed material; and placing the mixed material in a lamination mold for lamination treatment to obtain a sheet-shaped heat storage composite material. The heat storage composite material has high thermal conductivity and is not easy to leak.