Basic Dye Mixture Composition for Aramid Fiber Light Fastness
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Solution Overview
Problem
The dyeing process of aramid fibers is challenging due to their high crystallinity and compactness, and existing dyes often result in inadequate fastness properties, particularly in light fastness, for shades like reddish, violet, navy, brown, khaki, olive, green, and black.
Innovation Solution
A mixture of specific basic dyes, including those of formulas (I), (IIa), (IIb), and (IIc), with defined structural components and synthesis methods, is used to improve dyeing efficiency and light fastness on synthetic aramid fibers, with preferred combinations and proportions of these dyes to enhance color retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If basic dyes are used to dye aramid fibers, then the dyeing process can be performed, but the light fastness of the dyed fabric is insufficient
Solution Approach 1:
The patent applies composite dyeing by combining multiple basic dyes with different chemical structures (dyes of formula I, IIa, IIb, and IIc) to create a synergistic effect. This composite approach allows the dye mixture to achieve both adequate penetration into the compact aramid fiber structure and improved light fastness properties, resolving the contradiction between dyeing ease and fastness quality.
Solution Approach 2:
The patent modifies the chemical parameters of the dye molecules by specifying particular structural features in formulas I, IIa, IIb, and IIc (such as specific substituent groups and molecular configurations). These parameter changes in dye structure enable better interaction with aramid fibers while maintaining or improving light fastness, thus resolving the contradiction between dyeing processability and fastness performance.
2Ease of operation
If the dye structure is simplified for easier application, then the dyeing process becomes easier, but the color stability and fastness properties deteriorate
Solution Approach 1:
The patent applies local quality by specifying particular structural features in the dye molecules (formulas I, IIa, IIb, IIc) that are localized at critical positions. These localized structural characteristics (such as specific aromatic rings, substituent groups, and molecular configurations) provide both ease of application and enhanced color stability, resolving the contradiction between operational ease and composition stability.
3Reliability
If conventional single dyes are used, then the dyeing process is simple, but the fastness properties in various shades are inadequate
Solution Approach 1:
The patent segments the dyeing function by dividing it into multiple specialized dye components (formulas I, IIa, IIb, IIc), each contributing specific properties to the overall dye mixture. This segmentation allows each dye component to be optimized for particular functions while collectively achieving superior fastness properties across various shades, resolving the contradiction between fastness quality and mixture complexity.
Data Source
AI summary
The present invention is directed to dye mixtures comprising structures of formula and and/or their production and their use for dyeing textiles and in particular for dyeing aramid fibres.