Flexible Heat Storage Composition for Thick Film Application
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Solution Overview
Problem
Existing heat storage materials for housing and automotive applications lack flexibility and are difficult to apply in thick films, limiting their energy-saving effectiveness and ease of use.
Innovation Solution
A heat-storage composition with a viscosity of 100 to 1,000 dPa·s and a storage elastic modulus of 3 Pa or more, incorporating a resin and heat storage material, allowing for thick film application without slump and easy preparation, using thermoplastic resins like vinyl chloride with plasticizers to achieve flexibility and heat storage performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If phase change material is mixed into plasterboard, then heat capacity is increased, but flexibility and handling properties deteriorate
Solution Approach 1:
The invention changes the physical parameters of the binder from rigid (plasterboard) to flexible (thermoplastic resin), allowing the heat storage material to maintain both high heat capacity and flexibility. The thermoplastic resin binder provides plasticity and ease of handling while encapsulating the phase change material particles.
Solution Approach 2:
The invention creates a composite material system consisting of heat storage material particles dispersed in a thermoplastic resin binder. This composite structure combines the heat storage functionality of the phase change material with the flexibility and processability of the thermoplastic resin, resolving the contradiction between heat capacity and flexibility.
2Ease of operation
If thermoplastic resin sheet is used for heat storage, then flexibility is improved, but thickness is reduced to about 100 μm
Solution Approach 1:
The invention changes the rheological parameters of the composition by controlling viscosity (100-10,000 cP) and storage elastic modulus (G' ≥ 3 Pa), enabling the material to be applied in thick films (exceeding 100 μm) while maintaining flexibility. This parameter optimization allows thick application without slump or deformation.
Solution Approach 2:
The invention utilizes the dynamic properties of thermoplastic resin, which becomes more flexible at elevated temperatures during application. This temperature-dependent flexibility allows the material to be applied in thick layers without slumping, then maintains structural integrity after cooling and solidification.
3Manufacturing precision
If viscosity is increased to prevent slump during thick film application, then thick film application is enabled, but ease of kneading deteriorates
Solution Approach 1:
The invention optimizes the viscosity parameter to a specific range (100-10,000 cP) that balances two opposing requirements: high enough to prevent slump during thick film application, but low enough to allow easy kneading and mixing during preparation. This parameter window resolves the contradiction between application precision and manufacturing ease.
Solution Approach 2:
The invention applies different quality requirements to different stages of processing: during preparation and kneading, lower viscosity is preferred for ease of mixing; during application, higher viscosity within the specified range prevents slump. The composition is designed to exhibit appropriate viscosity characteristics for each processing stage.
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
Enables the formation of flexible, thick heat storage sheets with enhanced heat storage performance, suitable for various applications including building insulation and automotive interiors, while maintaining cost-effectiveness and ease of application.
Implementation Method 1
a heat storage material... maintaining an appropriate temperature for housing spaces of houses and the like and interior spaces of automobiles and the like
Implementation Method 2
heat storage material having flexibility... enhanced heat storage performance
Implementation Method 3
a viscosity of 100 to 1,000 decipascal seconds (dPa·s) as measured with a cylinder-type rotational viscometer
Implementation Method 4
a storage elastic modulus (G′) of 3 Pa or more at an angular frequency of 1 rad/s as measured by a dynamic viscoelasticity measurement method
Data Source
AI summary
A heat-storage composition includes a resin and a heat storage material. The composition has a viscosity of 100 to 1,000 dPa·s, as measured with a cylinder-type rotational viscometer. The composition also has a storage elastic modulus (G′) of 3 Pa or more at an angular frequency of 1 rad/s, as measured by a dynamic viscoelasticity measurement method at a temperature of 25° C. and at a strain of 0.1%.