Azo Dye Molecular Design for Lightfast Brownish Paper
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Solution Overview
Problem
Brown papers produced with existing dye mixtures often suffer from insufficient lightfastness when exposed to light or weather, leading to color change or shade alteration.
Innovation Solution
Development of new azo dyes containing at least two azo groups and aromatic or heterocyclic groups, which are water-soluble, allowing for the production of brownish shades in paper or board with enhanced lightfastness using a single dye instead of dye mixtures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dye mixtures are used to produce brown papers, then the desired brownish shade can be achieved, but the lightfastness is insufficient
Solution Approach 1:
The patent combines multiple azo groups and aromatic/heterocyclic groups into a single dye molecule structure. This merging of functional groups that were previously achieved through dye mixtures results in a unified compound that provides both the desired brownish shade and improved lightfastness, eliminating the need for complex dye mixtures.
Solution Approach 2:
The invention creates a composite molecular structure within the dye compound itself, integrating multiple azo groups (at least two) with aromatic and/or heterocyclic groups into one molecule. This composite structure at the molecular level achieves the color properties and stability that previously required mixing multiple different dye substances.
2Stability of the object's composition
If traditional dye mixtures are used, then brownish shades can be produced, but color change occurs when exposed to light or weather
Solution Approach 1:
The patent changes the chemical parameters of the dye by incorporating at least two azo groups and aromatic/heterocyclic groups into the molecular structure. This parameter change in the molecular composition enhances the dye's resistance to light and weather, preventing color change while maintaining the brownish shade.
3Device complexity
If a single dye is used instead of dye mixtures, then the complexity is reduced, but achieving sufficient lightfastness was previously not possible
Solution Approach 1:
The invention transitions from a dimensional approach of mixing multiple separate dye substances to a molecular dimensional approach where multiple functional groups (azo groups and aromatic/heterocyclic groups) are integrated within a single molecular structure. This dimensional change at the molecular level achieves both simplicity and high lightfastness.
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.