Textile Inkjet Ink Composition for Fastness and Nozzle Stability
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Solution Overview
Problem
Inkjet textile printing inks containing blocked isocyanate compounds face issues with fastness performance degradation over time and nozzle clogging due to decomposition of the blocked isocyanate group and the presence of tertiary amines, which affect both initial and long-term fastness and clogging performance.
Innovation Solution
An inkjet ink composition comprising a crosslinking component with a blocked isocyanate group, a tertiary amine, a specific carboxylic acid, a pigment, and water, along with optional resin particles and an inorganic base, which improves initial and long-term fastness performance and reduces nozzle clogging by suppressing the decomposition of the blocked isocyanate group and enhancing buffering capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocked isocyanate compound is used as a crosslinking agent to improve fastness performance, then the fastness performance is improved, but the blocked isocyanate group decomposes over time causing fastness performance to decrease
Solution Approach 1:
A tertiary amine is introduced as an intermediary substance that reacts with the blocked isocyanate group to form a stable complex. This intermediary prevents direct decomposition of the blocked isocyanate while maintaining crosslinking functionality, thereby preserving fastness performance during storage and after lapse of time.
Solution Approach 2:
The chemical environment parameters of the ink composition are modified by adjusting pH and adding specific components that stabilize the blocked isocyanate group. This changes the stability parameter of the crosslinking agent, allowing it to maintain both initial and long-term fastness performance without decomposition.
2Reliability
If a blocked isocyanate compound is used to improve fastness performance, then the fastness performance is improved, but clogging occurs in the discharge nozzle
Solution Approach 1:
The tertiary amine acts as a mediator that prevents aggregation and precipitation of the blocked isocyanate compound in the nozzle. By forming a stable complex, it ensures smooth discharge without clogging while maintaining the crosslinking capability for fastness performance.
Solution Approach 2:
The viscosity and chemical stability parameters of the ink composition are adjusted through pH control and addition of stabilizing components. This prevents the blocked isocyanate from precipitating in the nozzle, ensuring easy discharge while maintaining fastness performance.
3Ease of operation
If a tertiary amine is added to improve clogging performance, then the clogging of the discharge nozzle is improved, but the decomposition of the blocked isocyanate group is promoted
Solution Approach 1:
The pH parameter of the ink composition is precisely controlled to optimize the balance between clogging performance and fastness performance. By adjusting pH to a specific range, the tertiary amine effectively prevents nozzle clogging while minimizing promotion of blocked isocyanate decomposition.
Solution Approach 2:
Multiple components are combined in specific proportions to create a composite ink formulation where the tertiary amine's clogging prevention effect is maximized while its decomposition-promoting effect is minimized through synergistic interactions with other ingredients.
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 composition maintains excellent fastness performance over time and reduces nozzle clogging, ensuring improved rubbing fastness and dispersion stability while preventing the decomposition of the blocked isocyanate group, thus addressing the limitations of existing inks.
Implementation Method 1
a crosslinking component having a blocked isocyanate group... form a strong ink film... improve the washing fastness and the rubbing fastness
Implementation Method 2
mainly because the ink composition contains the specific carboxylic acid, the decomposition of the blocked isocyanate group of the specific crosslinking component is suppressed
Implementation Method 3
discharging the ink jet ink composition for textile printing from an ink jet apparatus to cause the ink jet ink composition to adhere onto a target recording medium containing at least fabric
Data Source
Figure 1
AI summary
An ink jet ink composition for textile printing contains a crosslinking component having a blocked isocyanate group, tertiary amine, at least one carboxylic acid selected from the group consisting of monocarboxylic acid, dicarboxylic acid, and tricarboxylic acid, a pigment, and water.