Isomeric Reactive Dye Mixture for High Fixation and Bath Stability
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Solution Overview
Problem
Existing reactive dyes used for dyeing and printing nitrogen-containing or hydroxy-group-containing fibre materials lack high fixation rates, good fastness properties, and stability to various dyeing parameters, particularly bath stability, while also failing to provide easy washing off of unfixed dye.
Innovation Solution
An isomeric mixture of reactive dyes comprising specific isomers in defined weight ratios, formulated to enhance build-up properties, fixation rates, and fastness, including improved bath stability, is developed through a diazotisation and condensation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional reactive dyes are used for dyeing nitrogen-containing or hydroxy-group-containing fibre materials, then the dyeing process can be completed, but the fixation rate is low and bath stability is poor
Solution Approach 1:
The patent applies the composite materials principle by creating a mixture of multiple reactive dyes with different chemical structures (vinylsulfonyl, β-sulfatoethylsulfonyl, and their isomers) to achieve synergistic effects. This composite dye mixture provides both high fixation rates and improved bath stability, resolving the contradiction between reliability and productivity parameters.
Solution Approach 2:
The patent employs parameter changes by carefully controlling the molar ratios of different dye components (specific ratios of vinylsulfonyl to β-sulfatoethylsulfonyl dyes and their isomers) and optimizing dyeing conditions (temperature, pH, time) to achieve the desired balance between fixation rate and bath stability.
2Ease of operation
If conventional reactive dyes are used, then dyeing can proceed, but washing off of unfixed dye is difficult and fastness properties are insufficient
Solution Approach 1:
The mixed dye composition includes dyes with different reactivity profiles and molecular structures, allowing unfixed dyes to be more easily washed off while the fixed dyes maintain strong bonding. This composite approach simultaneously improves ease of operation (washing off) and reliability (fastness properties).
3Device complexity
If single reactive dye compounds are used, then the dyeing process is simple, but build-up properties and tinctorial yield are insufficient
Solution Approach 1:
The patent uses a composite dye mixture containing multiple reactive dye compounds with different chromophores and reactive groups. This increases build-up properties and tinctorial yield through synergistic effects, while the complexity is managed by maintaining specific molar ratios of the components.
Solution Approach 2:
The mixed dye composition serves multiple functions simultaneously: providing high build-up properties, achieving good fixation rates, ensuring bath stability, and enabling easy washing off of unfixed dye. This multi-functionality resolves the contradiction between complexity and productivity.
4Reliability
If reactive dyes with high reactivity are used, then fixation rate improves, but stability to dyeing parameters (bath stability) deteriorates
Solution Approach 1:
The patent creates a composite dye system where dyes with different reactivity levels are combined. The mixture includes both highly reactive dyes (for high fixation rate) and dyes with moderate reactivity (for bath stability), achieving a balance between reliability and compositional stability through synergistic interactions.
Solution Approach 2:
The patent optimizes the chemical structure parameters of the dye molecules, specifically the ratio of vinylsulfonyl to β-sulfatoethylsulfonyl groups and their isomeric compositions, to achieve the desired balance between reactivity (fixation rate) and stability to dyeing parameters.
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 isomeric mixture achieves high fixation rates, good washing off properties, and improved stability to dyeing parameters, particularly bath stability, while maintaining good fastness and build-up properties.
Implementation Method 1
reactive dyes of formula (I)... Z is a fibre-reactive radical... suitable for the dyeing or printing of nitrogen-containing or hydroxy-group-containing fibre materials
Data Source
AI summary
The present invention relates to the field of isomeric mixture of reactive dyes that are suitable for the dyeing or printing of nitrogen-containing or hydroxy-group-containing fibre materials and yield on such materials dyeings or prints having a good build-up behaviour, a high fixation rate, good washing off properties of the unfixed dyes and good all-round fastness properties, as well as a good stability to various dyeing parameters such as a good bath stability. Furthermore, the present invention relates to a process for dyeing or printing of nitrogen-containing or hydroxy-group-containing fibre materials, wherein the isomeric mixture of reactive dyes according to the invention is used. The isometric mixture of the present invention comprises at least an isomer of formula (Ia) and an isomer of formula (Ib).