Ink jet ink composition for textile printing and ink jet textile printing method
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Solution Overview
Problem
Ink jet textile printing methods face challenges in maintaining fastness performance over time and preventing nozzle clogging, as blocked isocyanate compounds in ink jet inks decompose, leading to reduced fastness and increased clogging issues.
Innovation Solution
An ink jet ink composition containing a crosslinking component with a blocked isocyanate group, tertiary amine, specific carboxylic acid, pigment, and water, which improves initial fastness and clogging performance by suppressing decomposition of the blocked isocyanate group and enhancing nozzle discharge stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blocked isocyanate compound is used as crosslinking agent to improve fastness performance, then fastness performance is improved, but blocked isocyanate group decomposes over time and clogging occurs in discharge nozzle
Solution Approach 1:
The patent introduces a specific carboxylic acid as an intermediary substance that mediates between the blocked isocyanate compound and the ink formulation. The carboxylic acid forms a protective complex with the blocked isocyanate group, preventing its decomposition and subsequent nozzle clogging, while still allowing the crosslinking function to operate effectively for maintaining fastness performance.
Solution Approach 2:
The patent modifies the chemical environment parameters of the ink formulation by controlling pH levels and introducing specific carboxylic acids. This parameter change stabilizes the blocked isocyanate compound, preventing decomposition over storage time while maintaining its crosslinking capability for fastness performance.
2Object-generated harmful factors
If tertiary amine is added to improve clogging performance, then clogging of discharge nozzle is improved, but decomposition of blocked isocyanate group is promoted
Solution Approach 1:
The patent applies local quality by introducing a specific carboxylic acid that locally protects the blocked isocyanate group through complex formation. This localized protection occurs at the molecular level where the carboxylic acid binds to the isocyanate group, creating a stable complex that resists decomposition even in the presence of tertiary amine, while still allowing the tertiary amine to perform its clogging prevention function.
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 maintains excellent fastness performance both initially and after storage, while reducing nozzle clogging, ensuring consistent image quality and printer performance.
Implementation Method 1
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 2
mainly because the ink composition contains the tertiary amine, clogging of a discharge nozzle discharging the ink composition is improved
Implementation Method 3
a textile printing ink jet ink containing a pigment, a water-dispersible resin having a specific coating film elongation and tensile strength, a blocked isocyanate compound (crosslinking agent), and water at a predetermined ratio can form a strong ink film on recorded matter to improve the washing fastness and the rubbing fastness of the ink film
Data Source
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.