Thermochromic Color-Memory Composition with Broad Hysteresis
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Solution Overview
Problem
Conventional thermochromic coloring materials exhibit limited hysteresis characteristics, maintaining only one state at ordinary temperatures and requiring external heat or cold for color changes, restricting their practical applications.
Innovation Solution
A thermochromic coloring composition comprising an electron-donative organic compound, an electron-accepting compound with phenolic hydroxyl groups, and an ester compound with 2 aromatic rings and a saturated or unsaturated fatty acid, which provides a broad hysteresis width, allowing reversible discoloration and decoloration at ordinary temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional reversible thermal discoloration material is used, then it can discolor at a specified temperature, but it maintains only one state at ordinary temperature and requires external heat or cold for color changes
Solution Approach 1:
The patent changes the chemical parameters of the reaction medium by selecting specific ester compounds with particular molecular structures (aromatic rings, carbon chain lengths) to achieve a hysteresis width of 40-70°C, enabling the system to maintain both colored and decolored states at ordinary temperatures without external heat or cold application
Solution Approach 2:
The patent creates a composite thermochromic system combining electron-donative coloring compounds, electron-accepting compounds with phenolic hydroxyl groups, and specifically structured ester compounds to achieve enhanced hysteresis characteristics and color-memory ability at ordinary temperatures
2Reliability
If a thermochromic material with large hysteresis width is designed, then reversible discoloration can be maintained at ordinary temperatures, but the selection of reaction medium is limited
Solution Approach 1:
The patent identifies and utilizes specific structural parameters of ester compounds (aromatic rings, carbon atom count in fatty acid chains) to achieve the desired hysteresis width of 40-70°C, thereby expanding the range of suitable reaction media while maintaining reliable color-memory characteristics
Solution Approach 2:
The patent applies the principle of local quality by specifying particular structural features (aromatic rings, phenolic hydroxyl groups, carbon chain lengths) in the reaction medium components to achieve the optimal hysteresis effect, allowing selective maintenance of color states at ordinary temperatures
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 achieves a maximum hysteresis width of 40° C. to 70° C., enabling the reversible maintenance and reproduction of both colored and decolored states at ordinary temperatures, enhancing practicality and applicability in various fields such as heat-sensitive materials and toys.
Implementation Method 1
a thermochromic coloring color-memory composition which displays reversible discoloration between coloring and decoloring by showing a large hysteresis characteristic based on a change in temperature
Implementation Method 2
showing a large hysteresis characteristic based on a change in temperature and keeps either of the colored state and decolored state alternately and reversibly
Data Source
AI summary
A thermochromic coloring color-memory composition which comprises a homogeneous solubilized mixture of (A) an electron donative coloring organic compound, (B) an electron accepting compound and (C) an ester compound represented by the specific formula as a reaction medium which controls color reactions of the components (A) and (B).