Water-Based Ink Dispersibility and Stability
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Solution Overview
Problem
Water-based pigment inks for ink-jet recording using pigment dispersing resins experience instability in discharge and re-dispersibility, leading to warping and white voids during continuous recording, which affects the stability and quality of inkjet printing.
Innovation Solution
A water-based ink formulation incorporating a pigment dispersing resin with an ethylene oxide chain, an anionic surfactant, and a nonionic surfactant, both containing ethylene oxide groups, to enhance dispersibility and re-dispersibility, thereby stabilizing ink discharge and preventing warping and white voids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a pigment dispersing resin is used to disperse pigment in water, then the pigment can be dispersed in water, but the discharge stability becomes unstable during continuous recording
Solution Approach 1:
The patent uses a composite system combining pigment dispersing resin with specific surfactants (anionic and nonionic types) to achieve both good pigment dispersion and stable discharge performance during continuous recording
Solution Approach 2:
The patent optimizes the molecular structure parameters of the dispersing resin by incorporating ethylene oxide chains and controls the pH value and ionic strength of the ink formulation to improve discharge stability
2Stability of the object's composition
If a pigment dispersing resin is used to disperse pigment in water, then the pigment can be dispersed in water, but re-dispersibility is insufficient
Solution Approach 1:
The patent introduces surfactants as intermediary substances that facilitate the re-dispersion of pigment particles by reducing surface tension and preventing aggregation, making the re-dispersibility easier to achieve
Solution Approach 2:
The patent modifies the chemical structure of the dispersing resin by adding ethylene oxide chains which enhance hydrophilicity and improve re-dispersibility through changed interaction parameters with water and pigment particles
3Stability of the object's composition
If conventional pigment dispersing resin is used, then pigment can be dispersed, but warping and white voids occur during continuous recording
Solution Approach 1:
The patent creates a composite ink formulation combining pigment dispersing resin with specifically selected anionic and nonionic surfactants to prevent warping and white voids while maintaining pigment dispersion
Solution Approach 2:
The patent adjusts critical parameters including pH value, ionic strength, and molecular structure of the dispersing system to eliminate warping and white void defects during continuous recording
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 formulation improves the stability of ink discharge during continuous recording and enhances re-dispersibility, reducing the occurrence of warping and white voids, resulting in improved printing quality and chromaticness.
Implementation Method 1
a pigment dispersing resin including an ethylene oxide chain; an anionic surfactant including an ethylene oxide group; and a nonionic surfactant including an ethylene oxide group
Data Source
Figure 1
AI summary
A water-based ink for ink-jet recording includes: a pigment; water; a pigment dispersing resin including an ethylene oxide chain; and at least one of an anionic surfactant including an ethylene oxide group and a nonionic surfactant including an ethylene oxide group.