Fiber-Reactive Azo Dye Mixture for Reproducible Cotton Dyeing
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Solution Overview
Problem
Existing fiber-reactive azo dyes for dyeing hydroxyl- and carboxamido-containing materials face issues such as high dependence on dyeing parameters, poor reproducibility, inadequate color buildup on cotton, and a propensity for staining adjacent polyamide fabrics, leading to inefficiencies and economic challenges.
Innovation Solution
A dye mixture comprising specific azo dyes of formulas (I), (II), and (IV) with defined structural groups, optimized to achieve high fixation yields, low polyamide staining, and improved fastness properties, including high lightfastness and wetfastness, while allowing easy washing off of unfixed fractions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing fiber-reactive azo dyes are used for dyeing hydroxyl- and carboxamido-containing materials, then dyeing can be achieved, but the color yield shows overly great dependence on varying dyeing parameters and reproducibility is poor
Solution Approach 1:
The patent applies composite materials by combining multiple dye components in a specific mixture formulation. The dye mixture comprises reactive dye components with specific structural features (formula I components and formula II/III components) that work synergistically to provide consistent color yield across varying dyeing conditions, thereby improving reproducibility while reducing parameter dependence
Solution Approach 2:
The patent employs parameter changes by optimizing the chemical structure parameters of the dye molecules. Specific structural modifications in the reactive dye components (such as the sulfonate groups, aromatic amine structures, and reactive functional groups) are designed to maintain stable dyeing performance across a range of dyeing parameters including temperature, pH, and time
2Quantity of substance
If existing dyes are used to achieve adequate color buildup on cotton, then dyeing efficiency is maintained, but unfixed fractions are difficult to wash off and polyamide staining occurs
Solution Approach 1:
The patent applies local quality by designing dye molecules with specific functional groups that provide selective affinity for cotton fibers while minimizing interaction with polyamide. The reactive dye components contain hydroxyl-reactive and carboxyl-reactive groups that specifically target cotton's hydroxyl groups, enabling high color buildup on cotton without staining adjacent polyamide fabrics
Solution Approach 2:
The patent converts the potential harm of unfixed dye fractions causing staining into a benefit by designing the dye structure so that unfixed fractions are water-soluble and easily washable. The specific molecular structure ensures that dye molecules not fixed on the fiber remain in the dyebath or can be easily removed, eliminating the harmful staining effect
3Productivity
If high reactivity dyes are used to achieve high fixation yields, then color strength is improved, but dependence on dyeing parameters increases
Solution Approach 1:
The patent applies dynamics by creating a dye mixture that adapts its reactivity to the dyeing conditions. The combination of different reactive dye components with varying reactivity levels allows the system to maintain high fixation yields across different dyeing parameters, with the more reactive components acting first and less reactive components providing backup fixation under varying conditions
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 dye mixture exhibits high color strength, excellent fastness properties, and tolerance to temperature variations, reducing waste and improving dyeing process predictability, with enhanced economic and environmental benefits by minimizing packaging and carbon footprint.
Implementation Method 1
dye mixtures comprising one or more dye(s) of formula (I) and one or more dye(s) of formula (II) and/or formula (III)... for dyeing hydroxyl- and carboxamido-containing material
Data Source
AI summary
The present invention relates to dye mixtures comprisingone or more dye(s) of: formula (I)andone or more dye(s) of: formula (II) and/or formula (III)and optionallyone or more dye(s) of: formula (IV)to processes for their preparation and to their use for dyeing and printing hydroxyl- and carboxamido-containing materials.