Water-Based PTC Heating Element Coating for Reversible Thermal Cycling
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Solution Overview
Problem
Conventional PTC element manufacturing methods are energy-intensive, complex, and use harmful organic solvents, leading to decreased reversibility and economic efficiency, especially when subjected to repeated overheating and cooling cycles.
Innovation Solution
A polymer aqueous emulsion conductive composite is used to manufacture PTC elements through a wet process, eliminating the need for high-temperature melting and organic solvents, allowing for easy coating or dipping of substrates and subsequent lamination with insulating materials, thereby simplifying the manufacturing process and improving energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compounding forming method melting polymers at high temperature is used, then PTC elements can be manufactured, but energy cost is high and manufacturing complexity increases
Solution Approach 1:
The patent changes the processing parameters from high-temperature melting (above polymer melting point +20°C) to low-temperature solution processing. The polymer is dissolved in a solvent at relatively low temperature, and the conductive agent is mixed in solution state, then the solvent is removed to form the PTC element. This parameter change dramatically reduces energy consumption while maintaining PTC functionality.
Solution Approach 2:
The patent replaces the mechanical/thermal mixing process (melting and compounding at high temperature) with a solution-based chemical process. The polymer and conductive agent are mixed in solution state, allowing for homogeneous distribution without high-temperature mechanical energy input. This substitution of processing mechanism reduces energy cost significantly.
2Reliability
If polymers are melted and formed in continuous shape, then PTC elements can be manufactured, but reversibility decreases after repeated overheating and cooling cycles
Solution Approach 1:
The patent changes the physical state parameter of the polymer from melted continuous shape to dissolved molecular dispersion in solution. The polymer chains are separated and individually distributed throughout the solvent with conductive agents, creating a dispersed structure rather than a continuous melted matrix. This structural change maintains reversibility after thermal cycling.
Solution Approach 2:
The patent creates a composite material system where polymer molecules, conductive agents, and solvent are combined at the molecular level in solution. The conductive agent particles are uniformly dispersed among separated polymer chains, forming a homogeneous composite structure that maintains its properties through thermal cycles, unlike the continuous melted structure.
3Ease of manufacture
If conventional solution process with organic solvents is used, then PTC elements can be manufactured, but environmental harm increases
Solution Approach 1:
The patent replaces harmful organic solvents with water or environmentally benign solvents. This substitution eliminates the environmental and health hazards associated with organic solvents while maintaining the solution processing advantages. The water-based or green solvent system allows for easy manufacturing through coating, printing, or dipping methods without compromising the PTC element formation.
Solution Approach 2:
The patent changes the solvent type parameter from organic solvents to water or environmentally friendly solvents. This parameter change eliminates the harmful factors while preserving the solution processing benefits. The new solvent system enables the same manufacturing processes (coating, printing, dipping) without environmental damage.
4Reliability
If multiple complicated manufacturing steps including electron beam irradiation are used, then PTC elements can be manufactured, but device complexity and manufacturing time increase
Solution Approach 1:
The patent extracts and removes the complicated manufacturing steps from the process. Specifically, it eliminates the electron beam irradiation step, high-temperature melting step, and complex multi-stage processing. The invention achieves PTC element formation through a simplified solution-based process where the polymer and conductive agent are mixed in solution, applied to substrate, and dried, removing unnecessary complex steps while maintaining performance.
Solution Approach 2:
The patent merges multiple separate manufacturing operations into a single integrated solution process. The polymer dissolution, conductive agent mixing, and formulation are combined into one solution preparation step. The coating/printing/dipping and drying steps are integrated into a single application process, eliminating the need for separate electron beam irradiation and multiple processing stages.
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 method provides a cost-effective, eco-friendly PTC element with maintained reversible characteristics even after repeated overheating and cooling cycles, enhancing the practicality and safety of planar heating elements.
Implementation Method 1
a polymer aqueous emulsion conductive composite is used to manufacture PTC elements through a wet process
Implementation Method 2
a PTC (Positive Temperature Coefficient) element that prevent overheating by disabling electric connection by increase of resistance when overheating, and by allowing electric connection by decrease of resistance when cooling again
Implementation Method 3
coating or dipping a substrate with the conductive composite
Data Source
AI summary
A manufacturing method of a PTC (Positive Temperature Coefficient) element includes: producing a polymer aqueous emulsion solution; producing a polymer aqueous emulsion conductive composite by mixing the polymer aqueous emulsion solution with a conductive agent; and producing the PTC element by coating a substrate with the polymer aqueous emulsion conductive composite, or print the polymer aqueous emulsion conductive composite on the substrate, or dipping the substrate in the polymer aqueous emulsion conductive composite and drying the substrate. Here, the polymer aqueous emulsion solution includes an adhesive polymer, a cross-linking agent, an initiator, and water. The substrate is film, non-woven, textile, inflexible plate, and the like, which are formed of polymer resin.