Textile Inkjet Ink Composition for Black Hue and Nozzle Stability
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Solution Overview
Problem
Existing ink jet textile printing methods face challenges with black color developability and nozzle clogging due to the use of C.I. Reactive Black 39, which results in unstable ink ejection and reduced reproductivity, especially when trying to achieve tones like bluish or reddish black.
Innovation Solution
Incorporating a combination of Na+ and Li+ ions in the ink composition, which increases water solubility and allows for higher content of the reactive dye, forming stable bonds with fibers and preventing nozzle clogging, while also using additional reactive dyes to adjust the hue in the a* direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If C.I. Reactive Black 39 is used as the reactive dye, then black color developability is improved, but nozzle clogging occurs and ejection stability deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the reactive dye by specifying precise structural features (sulfonate groups at positions 2 and 7, triazine rings at positions 4 and 6, hydroxyl groups at positions 1 and 5) and controlling the molecular weight range (800-2000 Da). This parameter optimization allows the dye to achieve good color developability while maintaining ejection stability and preventing nozzle clogging.
Solution Approach 2:
The patent creates a composite ink formulation by combining the specific reactive dye (C.I. Reactive Black 39 with optimized structure) with carefully selected auxiliary substances including water-soluble polymers (0.1-10% by weight), surfactants (0.01-5% by weight), and pH buffers. This composite formulation achieves both good color development and stable ejection without clogging.
2Reliability
If conventional reactive dyes are used, then good color fastness is achieved, but hue control in a* direction is difficult
Solution Approach 1:
The patent modifies the chemical structure parameters of the reactive dye to achieve a balance between color fastness and hue control. The specific structure (C.I. Reactive Black 39 with optimized sulfonate and triazine group positions) provides good covalent bonding for color fastness while the controlled molecular weight and functional group distribution enable better hue control in the a* direction.
Solution Approach 2:
The patent uses a composite approach by combining the reactive dye with water-soluble polymers and surfactants that influence the dyeing behavior and hue development. This composite formulation maintains the covalent bond color fastness while allowing for better hue control through the interaction of multiple components in the ink system.
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 achieves high color developability, stable ejection, and easy recovery from clogging, enabling the production of high-quality black images with adjustable tones on various fabrics.
Implementation Method 1
Reactive dyes dye fabrics by a covalent bond that has the highest binding energy and is most stable of the linkages between fabrics and dyes
Implementation Method 2
the water solubility of the compound represented by formula (1) increases in the ink jet textile printing ink composition containing not only Na +
Data Source
AI summary
An ink jet textile printing ink composition according to the invention contains Li+, Na+, and a compound represented by the following formula (1):