Aqueous ink set composition for textile printing
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Solution Overview
Problem
Inkjet inks containing disperse dyes face issues with low storage stability, jetting reliability, and poor water resistance, particularly in industrial dyeing of hydrophobic fibers like polyester, leading to unacceptable wet crock fastness.
Innovation Solution
An aqueous ink set comprising a first and second ink, each containing a disperse dye, a dispersant, and lignin, with specific sugar alcohols, is used to enhance dispersion stability and jetting reliability, while maintaining image quality and wet crock fastness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an anionic dispersing agent such as lignin sulfonic acid or aromatic sulfonic acid is added to improve discharge stability and jetting reliability, then jetting performance is improved, but water resistance decreases leading to unacceptable wet crock fastness
Solution Approach 1:
The patent divides the dispersing function between two distinct components: a non-ionic dispersant (polyacrylate polymer) that provides primary dispersion stability, and a small amount of anionic dispersing agent (lignin sulfonic acid or aromatic sulfonic acid) that enhances jetting reliability without excessive water solubility. This segmentation allows each component to contribute its strengths while minimizing the harmful effects of high anionic dispersant content.
Solution Approach 2:
The patent carefully controls the concentration parameters of the anionic dispersing agent, limiting it to 0.01-5 wt% of the disperse dye (preferably 0.05-2 wt%). This parameter optimization ensures sufficient jetting reliability improvement while maintaining acceptable water resistance and wet crock fastness properties that would be lost at higher concentrations.
2Productivity
If disperse dye is used for hydrophobic fibers to achieve good penetration and diffusion, then dyeing efficiency is improved, but storage stability and jetting reliability deteriorate due to poor long-term dispersion stability
Solution Approach 1:
The patent combines a non-ionic dispersant (polyacrylate polymer with carboxyl groups, 500-50,000 molecular weight) with an anionic dispersing agent (lignin sulfonic acid or aromatic sulfonic acid) to create a synergistic dispersing system. The non-ionic dispersant provides steric stabilization for long-term storage stability, while the anionic dispersing agent enhances short-term jetting reliability, and together they maintain dispersion stability during the dyeing process for efficient penetration and diffusion into hydrophobic fibers.
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 set achieves stable inkjet performance, reliable jetting, and improved wet crock fastness on hydrophobic fibers, ensuring high-quality textile printing.
Implementation Method 1
an aqueous inkjet ink set comprising a disperse dye and a dispersant... incorporating lignin into at least one of the inks... improves dispersion stability
Implementation Method 2
The disperse dye penetrates and diffuses into the fibres under high temperature condition
Implementation Method 3
is fixed by means of hydrogen bond, intermolecular force, etc. between the fibre and the dye
Implementation Method 4
fixing a colouring material to the fabric by means of steaming or baking treatment after providing the ink composition
Data Source
AI summary
An aqueous ink set for textile printing comprising a first aqueous ink and a second aqueous ink, the first aqueous ink comprises a first disperse dye, a first dispersant and lignin, the second aqueous ink comprises a second disperse dye, a second dispersant and a sugar alcohol selected from the group consisting of threitol, erythritol, arabitol, ribitol, xylitol, lyxitol, sorbitol, mannitol, iditol, gulitol, talitol, galactitol, allitol, altritol, maltitol, isomaltitol, lactitol, turanitol, and combinations thereof. A recording method using the aqueous ink set is also included.