Heating Paste Composition for Low-Voltage Surface Heating Elements
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Solution Overview
Problem
Current heating pastes face challenges in maintaining heat stability at high temperatures, particularly above 200°C, and are not suitable for screen printing or gravure printing, while also having high specific resistance, making them inefficient for low-voltage and low-power operations.
Innovation Solution
A heating paste composition incorporating carbon nanotube particles, carbon nanoparticles, a mixture binder of epoxy acrylate or hexamethylene diisocyanate, polyvinyl acetal resin, and phenol-based resin, along with an organic solvent and dispersant, which allows for heat stability up to 200°C and low specific resistance, enabling screen and gravure printing and low-voltage operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heating paste is used, then the heating element can be manufactured, but it cannot maintain heat stability at temperatures above 200°C
Solution Approach 1:
The patent uses a composite binder system comprising polyvinyl acetal resin and phenol-based resin in specific weight ratios (95:5 to 5:95). This composite material combination enables the heating paste to maintain stability at temperatures above 200°C, with the phenol-based resin providing high-temperature resistance while the polyvinyl acetal resin ensures proper adhesion and flexibility during manufacturing.
2Power
If conventional heating paste with high specific resistance is used, then the heating element can operate, but it cannot operate efficiently at low voltage and low power
Solution Approach 1:
The patent modifies the electrical parameters of the heating paste by incorporating conductive particles (silver, aluminum, or carbon) in optimized concentrations and combinations. This changes the specific resistance parameter to enable efficient operation at low voltage and low power while maintaining heating performance, achieving a balance between power consumption and heating effectiveness.
3Ease of manufacture
If conventional heating paste is used, then the heating element can be produced, but it is not suitable for screen printing or gravure printing
Solution Approach 1:
The patent adjusts the rheological parameters of the heating paste by modifying binder composition, solvent content, and particle size distribution. These parameter changes optimize the paste's viscosity and flow characteristics, making it suitable for screen printing and gravure printing processes while ensuring precise pattern formation and uniform thickness.
4Stress or pressure
If conventional heating paste is used, then the heating element can be manufactured, but it has high specific resistance requiring high voltage operation
Solution Approach 1:
The patent employs composite conductive materials combining different particle types (silver, aluminum, carbon) with optimized size distributions and ratios. This composite approach reduces specific resistance by creating efficient electron conduction pathways through the matrix, enabling low-voltage operation while maintaining heating performance and electrical 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 composition maintains heat stability at high temperatures, facilitates efficient low-voltage and low-power operation, and allows for flexible substrate application, enhancing the production of surface type heating elements and portable heaters with improved efficiency and durability.
Implementation Method 1
a heating paste composition including conductive particles containing carbon nanotube particles and carbon nanoparticles
Implementation Method 2
an organic solvent, and a dispersant
Data Source
AI summary
The present disclosure relates to a heating paste composition which has heat stability, allows screen printing and gravure printing, has a small change in resistance depending on temperature, and can operate at low voltage and low power due to low specific resistance, to a surface type heating element using the same, and to a portable low-power heater. The heating paste composition may contain conductive particles including carbon nanotube particles and carbon nanoparticles, a mixture binder including epoxy acrylate or hexamethylene diisocyanate, a polyvinyl acetal and a phenol-based resin, an organic solvent, and a dispersant.