Acid dye mixture
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Solution Overview
Problem
Existing acid dyes for polyamide fibers face challenges in applicability, leveling, and fastness properties, particularly light fastness, especially when used in combination dyeing techniques.
Innovation Solution
A dye mixture comprising specific acid dyes of formulas (I) and (II), with defined structural components and preferred ratios, is developed for improved exhaustion and fastness properties, suitable for dyeing and printing of natural and synthetic polyamide fibers, including wool and nylon materials, using mechanical mixing and trichromatic techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known acid dyes are used for dyeing polyamide fibers, then dyeing applicability is achieved, but leveling properties and light fastness are insufficient
Solution Approach 1:
The patent applies composite materials by formulating a dye mixture containing at least two different acid dyes with specific structural formulas. This composite dye system combines dyes with different molecular structures and dyeing characteristics, where each component contributes specific properties: one dye provides good exhaustion and another provides superior leveling and light fastness, thereby resolving the contradiction between dyeing applicability and fastness properties.
Solution Approach 2:
The patent applies parameter changes by precisely controlling the structural parameters of the acid dye molecules, specifically the substituents at defined positions in the molecular formula. By varying these structural parameters (different substituent groups at specific positions), the patent optimizes the balance between dyeing kinetics (exhaustion) and dyeing quality (leveling and light fastness), enabling simultaneous improvement of both dyeing applicability and reliability.
2Quantity of substance
If conventional acid dye mixtures are used, then basic dyeing requirements are met, but exhaustion from short liquors is insufficient
Solution Approach 1:
The patent employs composite materials by creating a multi-component dye mixture where each acid dye component has specifically designed molecular structure. The composite system enables synergistic effects: certain dye structures promote high exhaustion from short liquors through enhanced fiber affinity, while other structural features in the mixture maintain or improve light fastness, thus resolving the trade-off between quantity of dye uptake and durability.
Solution Approach 2:
The patent applies local quality by introducing specific substituent groups at defined positions in the acid dye molecular structure. These localized structural modifications create dyes with enhanced affinity for polyamide fibers in specific regions of the molecule, improving exhaustion from short liquors, while other parts of the molecular structure maintain chromophore stability for light fastness, achieving both objectives through localized structural optimization.
3Reliability
If single acid dyes are used for dyeing, then process simplicity is maintained, but leveling properties are poor
Solution Approach 1:
The patent applies composite materials by formulating a dye mixture with at least two acid dyes having different molecular structures. This composite approach leverages the complementary dyeing characteristics of each component: one dye may dye faster while another levels better, and their combination achieves superior overall leveling properties. The increased composition complexity is offset by the significant improvement in dyeing quality and consistency.
Solution Approach 2:
The patent applies dynamics by creating a dye mixture where different dye components operate at different rates during the dyeing process. The dynamic interaction between dyes with different molecular structures, sizes, and affinities allows for progressive dyeing: faster-dyeing components initially establish color, while slower-dyeing components continue to level and distribute evenly, achieving superior leveling properties through dynamic multi-component interaction.
Data Source
AI summary
The present invention refers to a red-dyeing acid dye mixture comprising a dye of the formula (I)and at least one dye of the formula (II)a process for its manufacturing and a process for dyeing and printing of natural or synthetic polyamide fiber material in which it used.