Disazo Acid Dye Composition for Fast Polyamide Dyeing
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Solution Overview
Problem
There is a need for acid dyes with improved properties, particularly those that can effectively dye organic substrates such as natural and synthetic polyamides with high fastness levels and compatibility for use in various dyeing processes.
Innovation Solution
Development of novel acid dyes with specific molecular structures, including bridging members and sulpho groups, which are synthesized through conventional processes and can be used in combination with other acid dyes for achieving high-quality, fastness-level dyeings on polyamides and cellulose materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional acid dyes are used for dyeing polyamides, then the dyeing process is simple, but the light fastness and wet fastness levels are insufficient
Solution Approach 1:
The patent applies composite material principles by creating a complex molecular structure that combines multiple functional groups (azo chromophores, sulpho groups, bridging members with phenyl/naphthyl groups) into a single integrated dye molecule. This composite structure enables simultaneous achievement of excellent light fastness, wet fastness, and affinity for polyamide substrates, resolving the contradiction between performance improvement and structural simplicity.
Solution Approach 2:
The patent employs parameter changes by systematically varying the substituents on the bridging member (different alkyl groups, aryl groups, and their positions) to optimize the balance between fastness properties and dyeing performance. By adjusting parameters such as the type of bridging group (sulphon, sulphonamide, carboxamide) and the nature of R1-R10 substituents, the invention achieves improved fastness while maintaining compatibility with conventional dyeing processes.
2Reliability
If acid dyes with improved fastness properties are developed, then light and wet fastness improve, but compatibility with existing dyeing processes may be compromised
Solution Approach 1:
The patent applies local quality principles by incorporating specific functional groups at strategic positions within the molecular structure. The sulpho groups are positioned to ensure water solubility and affinity for polyamide substrates, while the azo chromophores provide the desired color fastness. The bridging member with its specific substituents (R1-R10) is designed to interact optimally with polyamide fibers, ensuring compatibility with existing dyeing processes while achieving superior wet fastness.
Solution Approach 2:
The patent achieves universality by designing a dye molecule that performs multiple functions simultaneously: the azo groups provide coloration and light fastness, the sulpho groups ensure water solubility and substrate affinity, and the bridging member structure enables compatibility with conventional acid dyeing processes. This multi-functional design allows the dye to be used in standard dyeing conditions while delivering improved performance across multiple parameters.
3Productivity
If novel bridging structures are introduced to improve dye performance, then exhaustion rates and fastness improve, but synthesis complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the complex dye molecule into distinct functional segments: the azo chromophore units, the bridging member with substituents R1-R10, and the sulpho groups. This segmented structure allows for systematic optimization of each component's contribution to exhaustion rate and fastness properties. The modular nature of the structure enables improved productivity through targeted modifications of specific segments without requiring complete redesign of the entire molecule.
Data Source
AI summary
Compounds of the general formula (I)a process for their preparation and their use for dyeing and/or printing organic substrates.