Fibre-Reactive Brown Dye Composition for Chlorine and Light Fastness
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Solution Overview
Problem
Existing fibre-reactive azo dyes for dyeing and printing materials suffer from deficiencies in chlorine fastness and light fastness, as well as build-up behaviour.
Innovation Solution
Development of fibre-reactive azo dyes with a specific molecular structure (Formula I) that includes a group removable under alkaline conditions, such as OSO3M or halogen, to form covalent bonds with hydroxyl, amino, and carboxamido groups, enhancing chlorine fastness and light fastness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing fibre-reactive azo dyes are used, then the dyeing process can be completed, but the chlorine fastness and light fastness are insufficient
Solution Approach 1:
The patent modifies the molecular structure parameters of the dye by introducing specific substituents (chloro, bromo, iodo groups) and adjusting the chromophore system to achieve superior fastness properties while maintaining manufacturability
Solution Approach 2:
The invention creates composite molecular structures combining multiple functional groups (azo chromophore, fibre-reactive groups, and halogen substituents) to achieve synergistic effects that improve both fastness and build-up behaviour
2Reliability
If existing fibre-reactive azo dyes are used, then the dyeing process can be completed, but the build-up behaviour is not advantageous
Solution Approach 1:
The patent introduces fibre-reactive groups at specific positions in the molecular structure to enhance local reactivity with fibre materials, improving build-up behaviour without requiring complex overall molecular architecture
3Ease of manufacture
If simpler dye structures are used, then the ease of manufacture increases, but the chlorine fastness and light fastness deteriorate
Solution Approach 1:
The dye molecule is segmented into distinct functional modules (chromophore, fibre-reactive groups, and halogen substituents) that can be independently optimized and synthesized, allowing for manageable complexity while achieving superior 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 dyes exhibit superior chlorine fastness, light fastness, and improved build-up behaviour compared to existing dyes, making them suitable for a wide range of fibre materials and printing processes.
Implementation Method 1
Fibre-reactive functional rests refer to rests capable of reacting with the hydroxyl groups of cellulosic materials, the amino, carboxyl, hydroxyl and thiol groups in the case of wool and silk, or with the amino and possibly carboxyl groups of synthetic polyamides to form covalent chemical bonds
Implementation Method 2
A group removable under alkaline conditions (Y) is a group, which will leave the molecule under alkaline conditions to yield the vinyl sulfone function. Examples of such groups are OSO3M, SSOsM, OCOCH3, OPOsM and halogen
Data Source
AI summary
Dyes of Formula (I): process for their production and use of such dyes.