Water-Soluble Azo Dye Composition for Lightfast Brown Papers
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Solution Overview
Problem
Brown papers often suffer from insufficient lightfastness when exposed to light or weather, leading to changes in color or shade, as existing dye mixtures fail to provide adequate protection against these factors.
Innovation Solution
Development of new azo dyes containing at least two azo groups and aromatic or heterocyclic groups, which are water-soluble and can produce materials with high lightfastness in brownish shades, using a single dye instead of mixtures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional dye mixtures are used to produce brown papers, then the desired brownish shade is achieved, but the lightfastness is insufficient
Solution Approach 1:
The patent applies composite materials by combining multiple azo groups and aromatic/heterocyclic groups within a single dye molecule structure. This creates a complex molecular architecture that provides both the desired brownish color and superior lightfastness, resolving the contradiction between achieving proper shade and maintaining color stability under light exposure.
Solution Approach 2:
The patent changes the chemical parameters of the dye by introducing at least two azo groups and specific aromatic/heterocyclic groups into the molecular structure. This structural modification alters the dye's properties to achieve high lightfastness while maintaining water solubility and brownish shade, directly addressing the lightfastness deficiency of traditional dyes.
2Ease of operation
If dye mixtures are used to achieve brownish shades, then color variety is possible, but the complexity of the dyeing process increases
Solution Approach 1:
The patent merges multiple functional groups (azo groups and aromatic/heterocyclic groups) into a single integrated dye molecule. This consolidation achieves the desired brownish shade with high lightfastness using one dye compound instead of multiple dye mixtures, simplifying the dyeing process while maintaining color quality.
Solution Approach 2:
The single azo dye compound performs multiple functions simultaneously: it provides the brownish shade, ensures high lightfastness, and maintains water solubility. This multi-functionality eliminates the need for complex dye mixtures and simplifies the overall dyeing operation.
Data Source
AI summary
The present invention relates to new azo dyes, a process for their preparation, and their use for dyeing or printing fibrous materials, to produce materials with brownish shades.