Water-based Heat-generating Coating Material for High-temperature Planar Heating
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Solution Overview
Problem
Conventional planar heat-generating elements with resistance heat-generating layers, due to their positive temperature coefficient properties, are limited to generating heat below a certain temperature (e.g., 100° C.), making them unsuitable for applications requiring higher temperatures.
Innovation Solution
A water-based heat-generating coating material comprising conductive materials, binder resins, and water-swellable synthetic mica, which forms a resistance heat-generating layer with reduced positive temperature coefficient properties, allowing for high-temperature heat generation up to 200° C., and a planar heat-generating element with a resistance heat-generating layer structure that includes low-resistance and high-resistance regions for adjustable heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resistance heat-generating layer with positive temperature coefficient properties is used, then safety and energy-savings are improved, but the maximum operating temperature is limited to below 100° C.
Solution Approach 1:
The invention changes the physical and chemical parameters of the binder resin by selecting materials with high heat resistance (polyimide, silicone, or polyamide resins) and optimizing their content ratio (15-50 parts by weight relative to 100 parts by weight of solid content). This allows the coating to maintain structural integrity at temperatures of 100° C. or higher while controlling the PTC effect through the specific combination of binder resin properties and conductive particle distribution.
Solution Approach 2:
The invention creates a composite heat-generating coating material comprising conductive particles (such as carbon black), binder resin, and water-swellable synthetic mica. This composite structure combines the heat-generating capability of conductive particles with the high-temperature stability of specialized binder resins, enabling the layer to operate safely at elevated temperatures up to 200° C. or higher without sacrificing the positive temperature coefficient safety mechanism.
2Reliability
If the temperature of the resistance heat-generating layer is limited to below 100° C., then safety is improved, but applicability to high-temperature fields is worsened
Solution Approach 1:
The invention modifies the thermal parameters of the heat-generating layer by using binder resins with high decomposition temperatures and optimized conductive particle content (30-70 parts by weight relative to 100 parts by weight of solid content). This enables the layer to safely operate at temperatures of 100° C. or higher, expanding its applicability to high-temperature fields such as floor heating, defrosting, and industrial heating applications while maintaining safety through controlled PTC properties.
Solution Approach 2:
The composite formulation combining conductive particles, high-heat-resistant binder resin, and water-swellable synthetic mica creates a material that simultaneously achieves high-temperature operation capability and safety. The specific composition ratios and material selection enable the coating to function reliably in diverse high-temperature applications including floor heating systems, defrosting devices, and industrial heating processes.
3Temperature
If water-swellable synthetic mica is added to reduce PTC properties, then heat generation temperature is improved, but manufacturing precision requirements are worsened
Solution Approach 1:
The invention establishes specific parameter ranges for water-swellable synthetic mica content (3-40 parts by weight relative to 100 parts by weight of solid content) to optimize the balance between reducing PTC properties and maintaining manufacturability. Within this range, the coating achieves sufficient heat generation capability at high temperatures while avoiding excessive complexity in manufacturing control. The patent provides clear guidance for formulation and processing parameters to achieve consistent results.
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 enables reliable high-temperature heat generation, reduces the likelihood of failures at lead wire connections, and allows for adjustable resistance values through pressing pressure, making the planar heat-generating element suitable for applications requiring temperatures above 100° C.
Implementation Method 1
water-swellable synthetic mica
Implementation Method 2
resistance heat-generating layer
Data Source
AI summary
An object is to provide a water-based heat-generating coating material that can generate high-temperature heat and a planar heat-generating element that includes a resistance heat-generating layer formed by applying the water-based heat-generating coating material. As a solution, a water-based heat-generating coating material is provided that includes a conductive material, a binder resin, and water-swellable synthetic mica, and contains the water-swellable synthetic mica by 3 parts by weight or more and 40 parts by weight or less relative to 100 parts by weight of solid content, as well as a planar heat-generating element that includes a resistance heat-generating layer formed by applying the water-based heat-generating coating material.