Reactive Dye Ink Composition for Stable Textile Jet Printing
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Solution Overview
Problem
Existing ink jet textile printing methods face challenges in achieving high optical density and stability due to the reaction between reactive dyes and solvents with hydroxy groups, leading to insufficient depth of shade and unclear patterns.
Innovation Solution
An ink composition containing a reactive dye and a water-soluble organic solvent with specific solubility and IOB values, which prevents unsatisfactory dyeing and maintains high ejection stability, comprising solvents A and B with no hydroxy group and hydroxy group respectively, and optionally solvent C with lower IOB values, to form patterns with high optical densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If reactive dye is used to increase depth of shade, then optical density is improved, but pattern clarity deteriorates due to unsatisfactory dyeing
Solution Approach 1:
The patent changes the chemical parameters of the solvent system by selecting specific solvents with controlled IOB values (2.0-4.0) and specific gravity (0.94-1.06), and by limiting hydroxy group content to 0.5-5.0 mass%. This parameter optimization prevents unwanted reactions between reactive dye and solvent while maintaining ejection stability, thereby achieving both high optical density and clear patterns
Solution Approach 2:
The patent uses a composite solvent system comprising multiple components: water-soluble organic solvent (specific gravity 0.94-1.06), alcohol solvent (IOB 2.0-4.0), and surfactant. This composite formulation creates synergistic effects that simultaneously enable stable ink ejection, prevent dye-solvent reaction, and maintain high depth of shade with clear pattern definition
2Illumination intensity
If dye content is increased to improve depth of shade, then optical density is improved, but ejection stability deteriorates
Solution Approach 1:
The patent optimizes the physical parameters of the solvent system by selecting solvents with specific gravity 0.94-1.06 and IOB value 2.0-4.0, and controlling hydroxy group content to 0.5-5.0 mass%. These parameter changes allow the ink to maintain appropriate viscosity and surface tension for stable ejection even with high reactive dye content (0.5-10 mass%), achieving both high optical density and reliable ejection performance
3Reliability
If ink composition is optimized for high ejection stability, then ejection stability is improved, but depth of shade deteriorates due to limited dye content
Solution Approach 1:
The patent employs a composite solvent formulation containing water-soluble organic solvent (specific gravity 0.94-1.06), alcohol solvent (IOB 2.0-4.0), and surfactant (0.1-5.0 mass%). This composite system provides the necessary ejection stability while simultaneously allowing high reactive dye content (0.5-10 mass%) to achieve depth of shade OD values of 2.0 or higher, resolving the trade-off between ejection stability and depth of shade
4Reliability
If solvent with hydroxy group is used to improve ejection stability, then ejection stability is improved, but dyeing quality deteriorates due to reaction with reactive dye
Solution Approach 1:
The patent carefully controls the hydroxy group content in the solvent system to 0.5-5.0 mass% and selects alcohol solvents with IOB values of 2.0-4.0. This parameter control prevents excessive reaction between hydroxy groups and reactive dye groups that would cause haze and poor pattern clarity, while maintaining sufficient ejection stability through the optimized solvent composition
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 stable ejection and high optical density in printed textiles, preventing unsatisfactory dyeing while maintaining ejection stability and increasing the depth of shade effectively.
Implementation Method 1
the reaction between reactive dyes and solvents with hydroxy groups, leading to insufficient depth of shade and unclear patterns
Data Source
AI summary
An ink composition for ink jet textile printing contains a reactive dye and water-soluble organic solvents including solvent A and at least one solvent B. Solvent A has a solubility of 10 g or more in 100 g of water at 20° C. and has no hydroxy group. Solvent B has a hydroxy group in the molecule thereof and has an IOB value of 2.9 or more and a Z1 value expressed by the following equation (1) of 18 or less. The total content Z2 of solvent A and solvents B in the ink composition is 3.8% by mass or more.Z1=∑i=1n(100*Ii*Xi)(1)wherein n represents the total number of solvents B in the ink composition, Ii represents the IOB value of solvent Bi that is any one of the solvents B, and Xi represents the ratio of the mass of solvent Bi to the total mass of the ink composition.