Basic Dye Mixture Composition for Aramid Fiber Lightfastness
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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), combined in various proportions with specific counterions, is used to enhance the dyeing of synthetic aramid fibers, improving lightfastness and overall fastness properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If basic dyes are used for dyeing aramid fibers, then the dyeing process can be performed, but the light fastness properties are insufficient
Solution Approach 1:
The patent uses composite dye mixtures containing at least two different basic dyes with specific chemical structures (formulae I and II). This composite approach combines dyes with complementary properties to achieve both adequate dyeing performance and improved light fastness, resolving the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The patent specifies precise compositional parameters for the dye mixture, including the ratio of dyes from formula (I) and formula (II), and defines specific chemical parameters (R1-R13 substituents, anion types). By optimizing these parameters, the invention achieves improved light fastness while maintaining dyeing processability.
2Reliability
If conventional dyes are used on aramid fibers, then the fibers can be colored, but the fastness properties are inadequate
Solution Approach 1:
The invention employs composite dye mixtures with specifically selected basic dyes having defined chemical structures. The complexity of the dye mixture is justified by the significant improvement in fastness properties, particularly light fastness, which is the primary goal of the invention.
Solution Approach 2:
The patent introduces specific local chemical structures (formulae I and II with defined substituents R1-R13) into the dye mixture. These structurally differentiated dyes provide localized improvements in fastness properties, allowing the overall dye system to achieve superior performance despite increased complexity.
3Ease of manufacture
If standard basic dyes are used for aramid fiber dyeing, then the process is simpler, but light fastness deteriorates
Solution Approach 1:
The patent modifies the chemical parameters of the basic dyes by specifying particular structural features (formulae I and II with defined R groups and anions). This parameter optimization maintains the simplicity of using basic dyes while dramatically improving light fastness, as the modified dyes retain basic dye characteristics but with enhanced photostability.
Solution Approach 2:
The invention creates a composite system using at least two basic dyes with specific structures in defined ratios. This composite approach preserves the ease of manufacture associated with basic dyeing processes while achieving improved light fastness through synergistic interactions between the different dye components.
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 dye mixtures provide improved fastness properties, particularly in lightfastness, for aramid fibers, resulting in stable and vibrant color retention across various shades.
Implementation Method 1
basic dyes, which are well known and are used for dyeing and printing of synthetic acrylic (Polyacrylonitrile, PAN) fibre material. In addition basic dyes can be used to colour aromatic polyamide fibre types (Aramid fibres)
Data Source
AI summary
The present invention is directed to dye mixtures comprising structures of formula and their production and their use for dyeing textiles and in particular for dyeing aramid fibres.