Temperature Control Material Using Porous Barrier for Conductivity Stability
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Solution Overview
Problem
Existing temperature control materials face issues with stability, durability, and practicality due to conductivity deterioration over time, especially in hostile conditions, and struggle to accurately detect temperature changes without visual observation.
Innovation Solution
A temperature control material is developed with a heat-melt substance and conductive paste separated by a porous material, preventing unexpected migration and maintaining conductivity stability, using carbon black or carbon nanotube powder for enhanced durability and weather resistance, and incorporating a thermosensitive ink layer for precise temperature detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heat-melt substance and conductive paste are contacted directly, then the temperature detection function is achieved, but the conductivity deteriorates with time due to migration and swelling
Solution Approach 1:
The patent divides the system into three separate layers: a heat-melt substance layer, a porous intermediate layer, and a conductive paste layer. This segmentation prevents direct contact between the heat-melt substance and conductive paste, eliminating migration and swelling issues while maintaining temperature detection functionality through thermal conduction across the layers.
Solution Approach 2:
The porous intermediate layer acts as a mediator between the heat-melt substance and conductive paste. It allows thermal energy to pass through while physically preventing the heat-melt substance from migrating into the conductive paste, thus maintaining both temperature detection capability and electrical conductivity stability.
2Ease of operation
If the heat-melt substance has low viscosity when melted, then it flows out from the conductive paste, but it may not permeate or disperse into the conductive paste sufficiently
Solution Approach 1:
The patent separates the heat-melt substance from the conductive paste with a porous intermediate layer, eliminating the problem of low-viscosity material flowing out. The segmented structure allows the heat-melt substance to remain in place while still enabling thermal conduction for accurate temperature detection.
Solution Approach 2:
The porous intermediate layer provides a controlled pathway for thermal energy while physically containing the heat-melt substance. The porous structure allows heat conduction but prevents the low-viscosity melted material from flowing out or migrating into the conductive paste layer.
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 provides a stable, durable, and weather-resistant temperature control material that can accurately detect temperature changes by electrical means, preventing conductivity deterioration and ensuring long-term usability even in harsh conditions.
Implementation Method 1
a heat-melt substance which melts by heat at a melting point according to temperature being detected
Implementation Method 2
the heat-melt substance penetrates the porous material to irreversibly permeate and/or disperse into the conductive paste
Implementation Method 3
the heat-melt substance is kept away the conductive paste through a porous material
Implementation Method 4
a conductive paste which includes conductive powder, the temperature control material is in a conductive state by the conductive paste
Data Source
AI summary
A sensitive and practicable temperature control material which precisely or determinably detects whether the temperature reaches a predetermined temperature by electrical change from a conductive state to an insulated or lower-conductive state has excellent time stability, chemical stability, durability, and weather resistance. The temperature control material includes a heat-melt substance which melts by heat at a melting point according to temperature being detected, and a conductive paste which includes conductive powder. The temperature control material is in a conductive state by the conductive paste. The heat-melt substance is kept away from the conductive paste through a porous material and the temperature control material changes to be in an insulated or lower-conductive states. The heat-melt substance penetrates the porous material to irreversibly permeate and/or disperse into the conductive paste on a heat-melt state thereof.