Acid-Base Inkjet Treatment Composition for Textile Print Fastness
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Solution Overview
Problem
Existing ink jet treatment liquids do not adequately balance friction fastness and stimulus mitigating properties, particularly in textile printed matters, leading to potential skin irritation and reduced fastness when using organic acids as aggregating agents.
Innovation Solution
A treatment liquid composition for ink jet that includes an acid compound with a pKa of 2.5 to 7.0 and a base compound with a specific molar concentration difference, maintaining a pH of 2.5 to 6.5, to enhance friction fastness while reducing skin stimulativeness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an organic acid is used as an aggregating agent in the treatment liquid, then friction fastness is improved, but skin stimulativeness increases
Solution Approach 1:
The patent changes the pH parameter of the treatment liquid to a specific range (2.5-6.5) and controls the pKa of the acid compound (2.5-7.0) to balance aggregation effectiveness with skin compatibility. This parameter optimization allows the acid to function as an aggregating agent while minimizing skin irritation.
Solution Approach 2:
The patent creates a composite treatment liquid system containing both acid compounds and base compounds working together. This composite approach allows the acid to provide aggregation functionality while the base component mitigates skin stimulativeness, achieving a balance between friction fastness and skin compatibility.
2Reliability
If the concentration of acid compound is increased to improve aggregation, then friction fastness improves, but neutralization reactions increase reducing stimulus mitigating properties
Solution Approach 1:
The patent precisely controls the concentration parameters of acid and base compounds, maintaining a specific pH range (2.5-6.5) and pKa range (2.5-7.0) for the acid compound. This parameter control ensures sufficient aggregation activity while limiting excessive neutralization reactions that would reduce stimulus mitigating properties.
Solution Approach 2:
The patent uses a controlled amount of acid compound that is sufficient for aggregation but not excessive enough to cause problematic neutralization reactions. The base compound is added in controlled amounts to mitigate skin stimulativeness without completely neutralizing the acid's aggregation 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 composition achieves excellent friction fastness and reduced skin stimulativeness in textile printed matters by balancing the reactivity of the acid and base compounds, ensuring the action of the acid is maintained while minimizing neutralization reactions.
Implementation Method 1
by balancing the reactivity of the acid and base compounds, ensuring the action of the acid is maintained while minimizing neutralization reactions
Data Source
AI summary
There is provided a treatment liquid composition for ink jet, which is used by being adhered to a recording medium, the treatment liquid composition for ink jet, containing an acid compound, a base compound, water, in which in the acid compound, a pka at 25° C. in water is at least 2.5 or more and 7.0 or less, and in the treatment liquid composition for ink jet, a difference (CA−CB) between a mass molar concentration CA (mol/kg) of an acidic group derived from the acid compound and a mass molar concentration CB (mol/kg) of a basic group derived from the base compound is 0.01 or more, and a pH at 25° C. is 2.5 or more and 6.5 or less.