A reactive dye compound and preparation method and application thereof
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Solution Overview
Problem
Existing polyazo reactive dyes with extended conjugated systems have improved dye-uptake and fixation but lack sufficient washing and rubbing fastness, failing to meet production requirements.
Innovation Solution
A reactive dye compound with a novel structure incorporating 3,5-dihydroxybenzoic acid, synthesized through a diazotization and coupling reaction process, which enhances washing and rubbing fastness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conjugated system of dyes is extended to improve substantivity and dye-uptake, then degrees of exhaustion and fixation increase, but washing and rubbing fastness deteriorate
Solution Approach 1:
The patent changes the chemical structure parameters of the dye molecule by introducing a specific coupling component with 3,5-dihydroxybenzoic acid and controlling the molar ratio of coupling components to chromophore precursors (1:1 to 3:1). This structural modification allows the dye to maintain extended conjugation for good substantivity while achieving excellent washing fastness (grade 4-5) and rubbing fastness (grade 3-4), thus resolving the contradiction between dye-uptake and fastness
Solution Approach 2:
The patent creates a composite dye structure by coupling multiple components including 3,5-dihydroxybenzoic acid, chromophore precursors, and reactive groups. This composite molecular structure combines the benefits of extended conjugation (for good substantivity) with specific functional groups that enhance fastness properties, achieving both high dye-uptake and excellent washing/rubbing fastness simultaneously
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 dye compound exhibits excellent washing and rubbing fastness, suitable for dyeing cellulosic and polyamide fibers, offering improved fiber-bonding stability and color retention.
Implementation Method 1
the aromatic amine compound is subjected to a diazotization reaction, thereby obtaining a diazonium salt
Implementation Method 2
the diazonium salt is subjected to a coupling reaction with 3,5-dihydroxybenzoic acid, thereby obtaining the reactive dye compound
Data Source
AI summary
A reactive dye compound and preparation method and application thereof. The reactive dye compound is a compound of the following formula (I) or an alkali metal salt thereof, in formula (I), D1 and D2 are each independently the group of the following formula (a) or (b). The reactive dye compound is capable of applying in printing and dyeing of cellulosic fibers, polyamide fibers or their fabrics. The reactive dye compound of the present invention has a novel structure, good washing fastness and rubbing fastness, and good fiber-bonding stability, and are suitable for dyeing and printing of fibers such as cotton, rayon, silk, viscose, and wool.