Aqueous Ink Jet Composition Stabilizing Fluorescent Dye
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Aqueous ink jet compositions containing fluorescent dyes like C.I. Disperse Red 364 face challenges in storage stability and nozzle clogging due to precipitation caused by drying, which leads to ejection defects, and existing dispersants either fail to improve stability or degrade it further.
Innovation Solution
Incorporating a sulfonic acid-based dispersant with a sulfo group and a third component with an indigo skeleton, such as C.I. Acid Blue 76, to enhance dispersion stability and prevent precipitation, while maintaining high water content and appropriate mass ratios to ensure effective ink jetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a dispersant with high hydrophobic property is used to improve dispersibility of fluorescent dye, then dispersibility is improved, but water solubility decreases causing solid component precipitation during drying
Solution Approach 1:
The patent combines two types of dispersants with different properties: a hydrophobic dispersant (first dispersant) to improve dye dispersibility, and a hydrophilic dispersant with sulfo group (second dispersant) to prevent precipitation during drying. This composite dispersant system resolves the contradiction by leveraging the complementary strengths of both dispersant types.
Solution Approach 2:
The patent optimizes the mass ratio parameters between the fluorescent dye, first dispersant, and second dispersant. Specifically, it controls the ratio of second dispersant to fluorescent dye within 0.1-10 mass% and first dispersant to fluorescent dye within 0.1-10 mass%, achieving the right balance between dispersibility and precipitation resistance.
2Reliability
If a dispersant with low hydrophobic property (such as sulfo group dispersant) is used to suppress precipitation during drying, then precipitation resistance is improved, but storage stability is seriously degraded
Solution Approach 1:
The patent uses a composite dispersant system where the hydrophobic first dispersant provides strong dye binding and dispersibility, while the hydrophilic second dispersant with sulfo group provides precipitation resistance during drying. The combination maintains storage stability while preventing clogging.
Solution Approach 2:
The patent carefully controls the concentration ratio of the two dispersants relative to the fluorescent dye. The second dispersant is used at 0.1-10 mass% of the fluorescent dye content, which is sufficient to prevent precipitation during drying but not so high as to compromise storage stability.
3Illumination intensity
If C.I. Disperse Red 364 fluorescent dye is used to achieve high fluorescent intensity, then fluorescent intensity is improved, but storage stability decreases and foreign materials are generated during storage
Solution Approach 1:
The patent introduces dispersants as intermediary substances between the hydrophobic C.I. Disperse Red 364 fluorescent dye and the aqueous ink medium. These dispersants act as mediators that stabilize the dye particles, preventing aggregation and foreign material generation during storage while preserving the high fluorescent intensity.
Solution Approach 2:
The patent employs a composite dispersant system where the first dispersant provides strong adsorption to the fluorescent dye particles, and the second dispersant with sulfo group provides water solubility and steric stabilization. This composite approach effectively stabilizes the fluorescent dye in aqueous solution.
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 solution achieves improved storage stability and prevents nozzle clogging, maintaining high fluorescent intensity and color density, even under thermal stress, by effectively dispersing the dye and preventing solid component precipitation.
Implementation Method 1
a second component which is a dispersant having a chemical structure of at least one of a sulfo group and a salt thereof
Implementation Method 2
a second component which is a dispersant having a chemical structure of at least one of a sulfo group and a salt thereof
Implementation Method 3
when the above fluorescent dye is applied to an ink-jet ink, compared to the other coloring materials, there have been problems in that storage stability of the ink-jet ink is low, and foreign materials are liable to be generated in the ink-jet ink during storage thereof
Implementation Method 4
an aqueous ink jet composition
Data Source
AI summary
An aqueous ink jet composition according to the present disclosure includes: C.I. Disperse Red 364 as a first component; a second component which is a dispersant having a chemical structure of at least one of a sulfo group and a salt thereof; and a third component having an indigo skeleton and a chemical structure of at least one of a sulfo group and a salt thereof.