Fluorescent Textile Ink Composition for Quenching Control
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Solution Overview
Problem
Ink jet textile printing methods using fluorescent dyes face issues with concentration quenching, where the fluorescence intensity decreases due to dye molecules absorbing each other's fluorescence, leading to insufficient color reproducibility and intensity, especially at high dye concentrations.
Innovation Solution
The use of an ink jet textile printing composition set that includes a fluorescent dye and a penetrant containing a compound with a lactam structure, such as 2-pyrrolidone or N-methyl-2-pyrrolidone, which helps in controlling the permeation of the ink into the fabric, reducing concentration quenching and enhancing fluorescence intensity across both the front and rear surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high dye concentration is used to improve color reproducibility, then color saturation is improved, but concentration quenching occurs causing fluorescence intensity to decrease
Solution Approach 1:
A penetrant containing a lactam compound (such as 2-pyrrolidone or N-methyl-2-pyrrolidone) is introduced as an intermediary substance between the fluorescent dye and the fabric. This penetrant controls the permeation of ink into the fabric, thereby suppressing concentration quenching and maintaining fluorescence intensity even at high dye concentrations.
Solution Approach 2:
The invention changes the chemical composition parameters of the ink jet textile printing system by incorporating specific lactam compounds (2-pyrrolidone or N-methyl-2-pyrrolidone) as penetrants. This parameter change modifies the permeation characteristics of the ink, allowing high dye concentration to be used without suffering from concentration quenching effects.
2Illumination intensity
If high dye concentration is used to improve color reproducibility, then color saturation is improved, but color developability on fabric surface is worsened due to blurring and graininess
Solution Approach 1:
The penetrant containing lactam compound acts as a mediator that controls the interaction between high-concentration fluorescent dye and fabric. It regulates ink permeation to prevent blurring and graininess, thereby maintaining color developability and image quality even when high dye concentration is used for improved color saturation.
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
This approach effectively suppresses concentration quenching, maintains high fluorescence intensity, and improves color developability on both surfaces, while also reducing blurring and graininess, especially at high dye concentrations, and during low-duty recording.
Implementation Method 1
a phenomenon that the fluorescence generated from dye molecules is absorbed by the other dye molecules, so that the fluorescence intensity decreases, which is referred to as concentration quenching
Data Source
AI summary
An ink jet textile printing composition set of the invention includes an ink jet textile printing ink composition and a penetrant. The ink jet textile printing ink composition contains a fluorescent dye and water, and the penetrant contains a compound having a lactam structure and water.