Disperse Azo Dye Structure for Washing and Sublimation Fastness
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Solution Overview
Problem
Existing disperse azo dyes do not achieve optimal fastness to washing and sublimation, which is crucial for dyeing hydrophobic materials like polyesters and blended fibers.
Innovation Solution
Development of disperse azo dyes with specific ester groups linked to the chromophore via a linker, specifically diazotized and coupled using known methods, resulting in dyes with improved fastness properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional disperse azo dyes are used, then the dyeing process is simple, but the washing fastness and sublimation fastness are insufficient
Solution Approach 1:
The dye molecule is segmented into distinct functional modules: a chromophore unit (azo group), a linker unit (containing ester groups at specific positions), and a diazo component. This segmentation allows optimization of each module's function - the chromophore provides color, the linker ensures fastness properties, and the diazo component enables dyeing - while maintaining overall molecular stability and performance
Solution Approach 2:
The invention creates a composite molecular structure combining multiple functional groups (azo chromophore, ester linkers, diazo components) into a single integrated dye molecule. This composite structure synergistically provides both the desired color properties and enhanced washing/fastness properties that individual components cannot achieve alone
2Reliability
If ester groups are linked directly to the chromophore, then the structure is simple, but the fastness properties are not optimized
Solution Approach 1:
A linker unit containing ester groups at the ortho position to the azo bridge is introduced as an intermediary between the chromophore and the diazo component. This intermediary structure mediates the interaction between the chromophore and the fiber, enhancing fastness properties by providing optimal spacing, orientation, and chemical interaction capabilities while maintaining structural stability
Solution Approach 2:
The invention optimizes specific molecular parameters including the position of ester groups (ortho position to azo bridge), the type of substituents (R1-R7 groups), and the linker structure (L group) to achieve optimal fastness properties. By systematically varying these parameters, the dye molecules achieve enhanced washing and sublimation fastness while maintaining color 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 dyes exhibit excellent washing fastness and very good sublimation fastness, ensuring even color tones and high durability on hydrophobic materials such as polyesters and blended fibers.
Implementation Method 1
a compound of the general formula (III) D-NH2 (III) where D is defined as stated above is diazotized and converted to a compound of the general formula (IV)
Implementation Method 2
The coupling of the diazotized compounds to the compounds of the general formula (IV) is generally also carried out in a known manner
Data Source
AI summary
The present invention relates to a dye of the general formula (I), wherein D signifies the residue of a diazo component; R1 bis R7 and L are defined as disclosed in claim 1, a method for the production thereof, and the use thereof.