Reactive Disperse AZO Dye Structure for Stable Supercritical CO2 Dyeing
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Solution Overview
Problem
Reactive disperse dyes used in supercritical CO2 for natural fiber dyeing often suffer from undesirable electron cloud interactions due to active groups, affecting dye coloring and stability.
Innovation Solution
A reactive disperse dye with a specific structure, incorporating a longer alkane-chain bridging group between the chromophoric parent structure and a cyanuric chloride active group, is developed to enhance electron cloud donation-withdrawal effects, improving color stability and compatibility with supercritical fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a reactive group is attached to the parent structure of a disperse dye to enable dyeing of natural fibers in supercritical CO2, then the dye can react with reactive groups in natural fibers, but the active group itself and its reaction have undesirable influence on the dye coloring system
Solution Approach 1:
The dye molecule is segmented into distinct functional regions: a chromophoric parent structure for color, a reactive group for fiber bonding, and an electron-donating substituent on the coupling component to modulate electron cloud density. This segmentation allows each component to perform its specific function while minimizing interference between them, particularly reducing the negative impact of the reactive group on color stability.
Solution Approach 2:
The patent applies local quality by introducing specific substituents (electron-donating groups) at specific locations (coupling component) of the dye molecule. This localized modification enhances electron cloud density in the conjugated system at the coupling site, which compensates for electron withdrawal by the reactive group, thereby maintaining overall color stability while preserving reactivity with natural fibers.
2Ease of manufacture
If simple reactive disperse dye structures are used, then the dye can be applied to dyeing of natural fibers in supercritical CO2, but the structure has undesirable donating/withdrawing effect of the coupling component on the electron cloud in the conjugated system
Solution Approach 1:
The patent changes the chemical parameters of the dye structure by introducing electron-donating substituents (such as alkyl groups, hydroxyl groups, or amino groups) on the coupling component. This parameter change directly affects the electron cloud density in the conjugated system, compensating for electron withdrawal by the reactive group and improving color stability without complicating the manufacturing process.
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 new dye structure reduces the influence of active groups on the dye system, enhancing hyperchromic effect, color stability, and compatibility with supercritical CO2, while maintaining excellent reaction controllability and low production costs.
Implementation Method 1
The reactive disperse dye is a specially structured dye which can be dissolved in non-polar supercritical CO2 fluid, and react with reactive groups in natural fibers
Implementation Method 2
supercritical CO2 fluid not only has the characteristics of low viscosity, high diffusivity
Data Source
AI summary
The invention discloses a special-purpose reactive disperse dye for waterless dyeing of natural fibers in supercritical CO2 fluid and an intermediate thereof. The reactive disperse dye has a longer alkane-chain bridging group between a chromophoric parent structure and an active group of the dye, which effectively promotes the donating-withdrawing effect on the electron cloud in the conjugated system, enhances the hyperchromic effect, effectively reduce the influence of the active group itself and its reaction on the dye coloring system, improves the color and stability against acid and alkali of the dye, and facilitate the improvement of the compatibility of the dye with supercritical fluid and the dyeing performance for natural fibers as well. The invention also discloses an intermediate of the reactive disperse dye, and a method for preparing the reactive disperse dye.