Thermochromic Color-Memory Composition with Ester Reaction Medium
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Solution Overview
Problem
Conventional thermochromic materials exhibit limited hysteresis characteristics, restricting their ability to maintain color states at temperatures away from the discoloration temperature, and lack flexibility in selecting reaction media for enhanced color-memory effects.
Innovation Solution
A thermochromic color-memory composition comprising an electron-donating organic compound, an electron-accepting compound, and a specific ester compound as a reaction medium, which controls the color reaction and exhibits a large hysteresis width, allowing reversible discoloration and color retention at various temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermochromic materials are used, then color change at discoloration temperature is achieved, but hysteresis characteristics are limited and color retention at temperatures away from discoloration temperature is poor
Solution Approach 1:
The patent modifies the chemical parameters of the reaction medium by introducing a specific ester compound with defined molecular structure (Formula 1) and composition ratios. This changes the physical-chemical environment to enable broader hysteresis characteristics, allowing the thermochromic material to retain color states across a wider temperature range while maintaining reliable color retention at temperatures away from the discoloration point.
Solution Approach 2:
The patent creates a composite thermochromic system combining electron-donating compounds, electron-accepting compounds, and the specific ester compound as reaction medium. This composite material structure synergistically enhances both color retention reliability and temperature range adaptability, resolving the contradiction between stable color memory and broad operational temperature range.
2Reliability
If specific compounds are selected for color reaction, then color-memory effect is achieved, but freedom in selection of reaction medium is restricted
Solution Approach 1:
The patent identifies a class of ester compounds (Formula 1) that can serve as universal reaction media for various electron-donating and electron-accepting compound pairs. This ester compound structure acts as a multi-functional platform that maintains color-memory effects while allowing flexibility in selecting different active compounds, thereby expanding reaction medium selection freedom without sacrificing color-memory reliability.
Solution Approach 2:
The patent changes the parameter space of acceptable reaction media by defining a specific ester compound structure with variable substituents (R groups with 4-22 carbon atoms). This parameter-based definition allows systematic variation of the reaction medium while preserving the essential color-memory function, providing both reliability and selection freedom.
3Length of stationary object
If hysteresis width is increased for better color retention, then temperature indication range is expanded, but discoloration sensitivity may be reduced
Solution Approach 1:
The patent optimizes the local chemical environment within the thermochromic system by introducing the specific ester compound. This creates localized regions with enhanced molecular interactions that simultaneously extend the hysteresis width for broader temperature indication while preserving sharp discoloration transitions at specific temperature points, thus maintaining measurement precision despite increased hysteresis.
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 demonstrates a broad hysteresis width, enabling reversible and interchangeable color retention at lower and higher temperature sides than the discoloration temperature, enhancing its applicability in temperature indication, ornaments, toys, and learning tools.
Implementation Method 1
thermochromic color-memory composition which displays reversible discoloration between coloration and decoloration showing prominent hysteresis characteristics according to temperature change
Implementation Method 2
displays reversible discoloration between coloration and decoloration showing prominent hysteresis characteristics according to temperature change and retains either a colored state or a decolored state
Data Source
Figure 1
AI summary
[Problems] An object of the present invention is to provide: thermochromic color-memory composition which effectively expresses a property of being capable of interchangeably memorizing and retaining colors and is thus applicable to various fields; and thermochromic memory microcapsule pigment encapsulating the same. [Means for Solution] Provided are thermochromic color-memory composition and thermochromic color-memory microcapsule pigment encapsulating the same, the thermochromic color-memory composition comprising: (a) a component composed of an electron-donating color-developing organic compound; (b) a component composed of an electron-accepting compound; and (c) a reaction medium which comprises an ester compound represented by the following Formula (1) and controls color reaction between the components (a) and (b): (wherein, R represents an alkyl group having 4 to 22 carbon atoms, a cycloalkylalkyl group having 5 to 12 carbon atoms, a cycloalkyl group having 4 to 8 carbon atoms or an alkenyl group having 4 to 22 carbon atoms; X represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms or a halogen atom; and n represents 0 or 1).