Aqueous ink composition for ink jet textile printing and textile printing method
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Solution Overview
Problem
Existing aqueous ink compositions for ink jet textile printing face challenges in achieving satisfactory coloring properties, light resistance, water resistance, and storage stability, particularly on water-repellent fabrics like nylon, due to the complex correlation between dye molecular structure and counterions, which is not fully understood or utilized in current technologies.
Innovation Solution
An aqueous ink composition containing lithium ions, sodium ions, and a dye where multiple ligands coordinate to a metal atom, such as chromium, is used, with specific concentration ratios and organic solvents like lactams and polyols to enhance water solubility, storage stability, and coloring properties, allowing for effective textile printing on nylon and nylon/urethane blended fabrics with reduced dye concentration and ink amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional aqueous ink compositions are used for ink jet textile printing, then basic coloring properties can be achieved, but satisfactory light resistance, water resistance, and storage stability cannot be obtained, especially on water-repellent fabrics like nylon
Solution Approach 1:
The patent changes the chemical parameters of the ink composition by introducing specific metal complexes (chromium, cobalt, nickel, or copper) coordinated with nitrogen-containing heterocyclic ligands. This parameter change transforms the molecular structure to achieve superior light resistance and water resistance while maintaining coloring properties on water-repellent fabrics
Solution Approach 2:
The patent creates a composite dye molecule consisting of a metal atom coordinated with nitrogen-containing heterocyclic ligands. This composite structure combines the advantages of metal complexes (light resistance, water resistance) with the coloring properties of organic dyes, resolving the contradiction between reliability and composition complexity
2Manufacturing precision
If high dye concentration is used to achieve satisfactory coloring properties, then coloring performance improves, but storage stability and discharge reliability deteriorate due to precipitation and clogging
Solution Approach 1:
The patent changes the chemical parameters by using metal complexes with nitrogen-containing heterocyclic ligands, which have improved solubility characteristics. This allows the ink to maintain satisfactory coloring properties at lower concentrations while achieving excellent storage stability and discharge reliability by preventing precipitation and clogging
Solution Approach 2:
The patent utilizes the coordination structure of metal complexes that create a molecular configuration with improved solubility and dispersibility in aqueous media. This molecular-level 'porosity' or spacing prevents molecular aggregation and precipitation, maintaining reliability even at optimized lower concentrations
3Manufacturing precision
If conventional dyes are used to achieve satisfactory coloring properties, then color intensity can be obtained, but the correlation between molecular structure and ink capabilities is not optimized, limiting further improvement
Solution Approach 1:
The patent systematically changes the molecular structure parameters by using metal atoms (chromium, cobalt, nickel, or copper) coordinated with nitrogen-containing heterocyclic ligands. This structured parameter change creates a family of dyes with optimized capabilities including coloring properties, light resistance, water resistance, and solubility, achieving versatility in ink performance
Solution Approach 2:
The patent creates a universal dye structure based on metal complexes with nitrogen-containing heterocyclic ligands that can achieve multiple capabilities simultaneously: coloring properties, light resistance, water resistance, and storage stability. This multi-functional structure allows optimization across all ink capabilities rather than sacrificing one for another
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 ink composition achieves superior water solubility, storage stability, and coloring properties, ensuring reliable discharge and attachment to fabrics even at low dye concentrations, thereby improving the overall performance and efficiency of ink jet textile printing.
Implementation Method 1
a dye in which a plurality of ligands represented by any of the following formula (1), formula (2), and formula (3) coordinate to a metal atom
Data Source
AI summary
An aqueous ink composition for inkjet textile printing contains: lithium ions; sodium ions; and a dye in which a plurality of ligands represented by any of formula (1), formula (2), and formula (3) coordinate to a metal atom.