Metal Complex Reactive Dyes for High-Fastness Polyamide Dyeing
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Solution Overview
Problem
Current reactive dyes fail to provide high substantivity, ease of washing off unfixed dye, good color yield, and high reactivity, especially for dyeing synthetic polyamide fibers, particularly in navy blue shades, with excellent fastness properties to light, wetting, and chlorine.
Innovation Solution
Development of novel reactive dyes with a specific formula containing chromium, cobalt, or iron, combined with specific radicals and cyanuric halides, through a multi-step condensation process, resulting in high fixing yields and fiber binding stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If acid dyes are used for deep coloured dyeings on polyamide, then color depth is improved, but fastness to wetting at elevated temperatures deteriorates
Solution Approach 1:
The invention changes the chemical parameters of the dye by using reactive dyes with specific metal complex structures (formula I) instead of acid dyes. This structural parameter change enables the dye to achieve both deep coloration and high fastness to wetting at elevated temperatures through the reactive groups that form covalent bonds with the polyamide fibers.
Solution Approach 2:
The invention creates a composite dye structure combining metal complexes (chromium, cobalt, or iron) with reactive groups and naphtholic/phenolic moieties. This composite structure integrates the color depth properties of metal complex dyes with the fastness properties of reactive dyes, resolving the contradiction between color depth and wetting fastness.
2Reliability
If reactive dyes are used to achieve deep dyeings with permanent fastness to wetting, then fastness to wetting is improved, but substantivity and ease of washing off unfixed dye may be compromised
Solution Approach 1:
The invention applies local quality by having different parts of the dye molecule serve different functions: the metal complex portion provides fastness to wetting, while the reactive groups with specific solubility characteristics ensure good substantivity and ease of washing off unfixed dye. The sulfonate groups specifically address the washing-off property while the metal complex ensures fastness.
3Productivity
If known reactive dyes are used, then some properties are satisfied, but high fixing yields and high fibredye binding stabilities are not achieved simultaneously
Solution Approach 1:
The invention merges multiple functional components into a single dye molecule: metal complex for stability, reactive groups for high fixing yield, and naphtholic/phenolic moieties for fibredye binding stability. This combination allows the dye to achieve high fixing yields (80-95%) while maintaining high fibredye binding stability through the coordinated action of all components.
4Productivity
If reactive dyes are designed for high reactivity and good color yield, then fixing efficiency is improved, but all-round fastness properties (light, wetting, chlorine) may be compromised
Solution Approach 1:
The invention creates a universal dye structure that performs multiple functions simultaneously: the metal complex provides light fastness and wetting fastness, the reactive groups ensure high fixing efficiency, and the overall molecular structure delivers chlorine fastness. This multi-functional design allows the dye to achieve high fixing efficiency while maintaining excellent all-round fastness properties.
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 reactive dyes achieve high fixing yields, excellent all-round fastness properties, including light and wetting fastness, and uniform color build-up on synthetic polyamide fibers, particularly in navy blue shades, with improved reactivity and water solubility.
Implementation Method 1
T is a fibre-reactive radical of formula or wherein q is the number 0 or 1
Implementation Method 2
Me is chromium, cobalt or iron
Data Source
AI summary
Reactive dyes of formula (1), wherein Me is chromium, cobalt or iron, R1 is hydrogen or unsubstituted or substituted C1-C4alkyl, E is a bivalent radical of formula (1a), (1b) or (1c) wherein X denotes chlorine or fluorine, T es a fibre-reactive radical of formula (2a), (2b), (2c), (2d), (2e), or (2f), (R3)0-2 denotes from 0 to 2 identical or different substituents from the group halogen, C1-C4alkyl, C1-C4alkoxy and sulfo, Z is vinyl or a -CH2-CH2-U radical and U is a group that is removable under alkaline conditions, Q is a -CH(Hal)-CH2-Hal or -C(Hal)=CH2 group, q is the number 0 or 1, G is a bivalent radical of formula (1d) or (1e) wherein (R2)s denotes s identical or different substituents from the group halogen, nitro, unsubstituted or halo-substituted C1-C4alkyl, C2-C4alkanoylamino, C1-C4alkylsulfonyl, carbamoyl, sulfamoyl, sulfo and -E-T, wherein E and T are as defined above, s is the number 0, 1, 2 or 3, A denotes a bivalent radical of formula (3a), (3b) or (3c), wherein R1, R2, X, T, q and s are as defined above, R4 and R7 denote hydrogen, C1-C4alkyl, -COOH or -COO- C1-C4alkyl, R5 and R6 represent, each independently of the other, identical or different substituents from the group hydroxyl, halogen, nitro, unsubstituted or halo-substituted C1-C4alkyl, C1-C4alkoxy, C2-C4alkanoylamino, C1-C4alkylsulfonyl, carbamoyl, sulfamoyl and sulfo, and t and u are each independently of the other the number 0, 1, 2 or 3, are especially suitable for dyeing synthetic polyamide fibre materials and yield dyeings or prints having good wet-fastness properties.