Metal-Complex Reactive Dyes for Wet-Fast 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 when dyeing synthetic polyamide fibre materials, which requires novel dyes with improved fixing yields and fibre-dye binding stabilities for achieving deep, fast, and brilliant navy blue shades with excellent fastness properties.
Innovation Solution
Development of a reactive dye with a specific formula incorporating chromium, cobalt, or iron, featuring a fibre-reactive radical and a bivalent radical, allowing for high fixing yields and fibre-dye binding stabilities, achieved through a multi-step condensation process involving cyanuric halides and metal complex compounds, resulting in dyes suitable for synthetic polyamide fibre materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional reactive dyes are used for dyeing polyamide fibre materials, then deep coloured dyeings can be achieved, but the dyeings are not fast to wetting at elevated temperatures
Solution Approach 1:
The patent modifies the chemical structure of reactive dyes by introducing specific radical combinations (formula I with defined substituents R1-R7, t-u, and metal complexes Me) to enhance fastness to wetting at elevated temperatures while maintaining dyeing effectiveness on polyamide fibres
Solution Approach 2:
The invention creates composite dye structures combining multiple functional components: azo radicals, naphthalene radicals, metal complexes (chromium, cobalt, or iron), and fibre-reactive radicals with specific leaving groups, forming a multifunctional molecule that simultaneously provides deep coloration and improved wetting fastness
2Reliability
If reactive dyes are used to achieve deep coloured dyeings on polyamide, then colour yield improves, but substantivity and ease of washing off unfixed dye are insufficient
Solution Approach 1:
The patent optimizes the balance between substantivity and wash-off properties by carefully selecting the fibre-reactive radical T with specific leaving groups U (halogen, sulfato, carboxy, phosphate, or thiosulfato radicals) that provide controlled reactivity and appropriate ease of washing off unfixed dye while maintaining high colour yield
3Reliability
If known reactive dyes are used, then some requirements are met, but high fixing yields and high fibre-dye binding stabilities cannot be achieved simultaneously
Solution Approach 1:
The invention enhances both fixing yield and fibre-dye binding stability by incorporating metal complexes (Me = chromium, cobalt, or iron) coordinated with specific ligands in the dye structure, which strengthen the interaction between the dye and polyamide fibres while maintaining high reactivity and fixing efficiency
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 reactive dyes exhibit excellent all-round fastness properties, including light, wetting, and chlorine fastness, with high reactivity and uniform colour build-up, suitable for microfibres and various textile materials, while maintaining good water-solubility and compatibility with other dyes.
Implementation Method 1
T is a fibre-reactive radical of formula (2f) wherein Hal denotes chlorine or bromine, especially bromine
Implementation Method 2
a multi-step condensation process involving cyanuric halides and metal complex compounds
Data Source
AI summary
Reactive dyes of, for example, formula (101) especially suitable for dyeing synthetic polyamide fibre materials and which yield dyeings or prints having good wet-fastness properties, and a process for their preparation.