Fiber-Reactive Azo Dye Mixtures for High Buildup and Fastness
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Solution Overview
Problem
Current fiber-reactive azo dyes face limitations such as insufficient color buildup at high concentrations, requiring specific dyeing conditions, and compromising economic viability and fastness properties.
Innovation Solution
A novel dye mixture comprising specific azo dyes with defined chemical structures, allowing for high fixation yields, easy washoff, and excellent fastness properties, including lightfastness and wetfastness, without the need for special dyeing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If Anthraquinone dyes are used, then specific dyeing applications are enabled, but color buildup is insufficient at high concentrations
Solution Approach 1:
The patent combines Anthraquinone dyes and Dioxazine dyes into a single dye mixture. The Dioxazine dye component provides the necessary color buildup at high concentrations, while the Anthraquinone dye contributes to the overall dyeing performance, resolving the contradiction between color buildup and dyeing performance reliability.
2Quantity of substance
If Dioxazine dyes are used, then good color buildup is achieved, but specific dyeing conditions are required
Solution Approach 1:
By merging Dioxazine dyes with Anthraquinone dyes in specific proportions, the mixture achieves good color buildup while reducing dependence on specific dyeing conditions. The combination allows for more flexible application across different dyeing processes while maintaining the color buildup advantage of Dioxazine dyes.
3Illumination intensity
If high dye concentrations are used, then color strength is improved, but color buildup becomes insufficient
Solution Approach 1:
The patent combines dyes with different concentration-response characteristics. The Dioxazine dye component provides strong color buildup even at lower concentrations, while the Anthraquinone dye contributes to color strength. This synergistic combination resolves the contradiction between color strength and color buildup at various concentrations.
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 novel dye mixture achieves high color strength, excellent fastness properties, and easy removal of unfixed dye portions, ensuring durable and vibrant dyeings on various materials like cellulose fibers and wool, with improved economic viability.
Implementation Method 1
fiber-reactive azo dyes... high degrees of fixation
Implementation Method 2
high color strength... dyeing yields
Data Source
AI summary
The present invention provides dye mixtures containing a dye of the formula (I)and a dye of the formulae (II)whereZ is —CH═CH2 or —CH2CH2Z1 andZ1 is hydroxyl or an alkali-eliminable group; andM is hydrogen, an alkali metal or one equivalent of an alkaline earth metal. The invention also relates to a process for their preparation and their use.