Aqueous ink jet composition for textile printing
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Solution Overview
Problem
Aqueous inkjet inks containing disperse dyes face issues with low storage stability and jetting reliability due to dispersion stability problems, and the use of anionic dispersing agents like lignin sulfonic acid compromises water resistance and wet crock fastness of printed textiles.
Innovation Solution
Incorporating lignin into the aqueous inkjet ink composition, along with a disperse dye and a dispersant, to enhance dispersion stability and jetting reliability while maintaining acceptable water resistance and wet crock fastness, by controlling lignin concentration and using it as a synergist with dispersants to improve milling efficiency and particle size distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anionic dispersing agents like lignin sulfonic acid are used to improve dispersion stability, then storage stability and jetting reliability are improved, but water resistance and wet crock fastness deteriorate
Solution Approach 1:
The patent extracts and removes the anionic dispersing agent (lignin sulfonic acid) from the ink composition that was causing the water resistance problem, while retaining the beneficial dispersing function through alternative means (optimized dispersant selection and lignin modification)
Solution Approach 2:
The patent changes the chemical parameters of the dispersing system by modifying lignin (reducing sulfonic acid groups) and selecting specific dispersants with appropriate HLB values and molecular weights, thereby achieving dispersion stability without the harmful water resistance degradation
2Object-affected harmful factors
If disperse dye is used for dyeing hydrophobic fibres, then colour fastness is improved, but storage stability and jetting reliability deteriorate due to dispersion instability
Solution Approach 1:
The patent creates a composite dispersing system combining modified lignin with specifically selected dispersants (non-ionic and/or anionic) that have complementary properties, achieving synergistic dispersion stability that prevents dye aggregation while maintaining jetting performance
Solution Approach 2:
The patent optimizes multiple parameters including dispersant HLB value (12-18), dispersant molecular weight (1000-10000), and lignin modification degree to achieve the optimal balance between dispersion stability and jetting reliability
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 solution provides stable and reliable inkjet inks with improved storage stability, jetting performance, and enhanced wet crock fastness, ensuring high-quality prints on polyester textiles without compromising image quality or hue.
Implementation Method 1
aqueous inkjet ink composition comprising water, a disperse dye, a dispersant and lignin
Implementation Method 2
Improved ink stability is claimed due to the presence of lignin sulfonic acid
Implementation Method 3
The disperse dye penetrates and diffuses into the fibres under high temperature condition
Implementation Method 4
is fixed by means of hydrogen bond, intermolecular force, etc. between the fibre and the dye
Implementation Method 5
fixing a colouring material to the fabric by means of steaming or baking treatment after providing the ink composition
Implementation Method 6
the dye is sublimated and transferred from a side on the intermediate transfer medium to a recording medium to be dyed
Data Source
AI summary
Aqueous ink for textile printing comprising a disperse dye, a dispersant and lignin. A manufacturing method of this ink is provided. An inkjet recording method on textile fabric using the aqueous ink comprising a disperse dye, a dispersant and lignin is also provided.