Ink composition for ink jet textile printing and ink jet textile printing method
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Solution Overview
Problem
Existing ink jet textile printing methods face challenges in achieving high depth of color and optical density due to limitations in dye content and stability, leading to unsatisfactory patterns, especially when using reactive dyes which react with solvents containing hydroxy groups.
Innovation Solution
An ink composition with a water-soluble organic solvent system, including specific solvents A and B, and a reactive dye formulation that maintains ejection stability while preventing unsatisfactory dyeing, using solvents with controlled IOB values and ratios of C.I. Reactive Black 39 to C.I. Reactive Orange 99 and C.I. Reactive Brown 11, to achieve high optical density patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the dye content in the ink is increased to achieve high depth of color, then the optical density improves, but the ejection stability deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the solvent system by selecting specific solvents with controlled IOB values (solvent A with IOB≥1.2, solvent B with IOB<1.2) and specific chemical structures (excluding hydroxy groups in solvent A). This parameter optimization allows the ink to maintain appropriate viscosity and surface tension for stable ejection while accommodating higher dye content for improved optical density.
Solution Approach 2:
The patent employs a composite solvent system consisting of multiple solvents (solvent A and solvent B) with complementary properties. Solvent A provides high solubility and stability, while solvent B adjusts viscosity and ejection characteristics. This composite approach enables the ink formulation to simultaneously achieve high dye content, stable ejection, and high optical density that cannot be achieved with a single solvent.
2Quantity of substance
If reactive dye is used to achieve high depth of color, then the optical density improves, but the pattern clarity deteriorates due to reaction with solvents containing hydroxy groups
Solution Approach 1:
The patent extracts and removes hydroxy groups from solvent A, which are the problematic functional groups that cause unwanted reactions with reactive dyes. By selecting solvents without hydroxy groups (such as amides, esters, ketones, ethers), the patent eliminates the source of the problem while maintaining the necessary solvent properties for ink performance.
Solution Approach 2:
The patent introduces solvent B as an intermediary component that mediates between the reactive dye and the ink jet ejection process. Solvent B, with its specific IOB value range and chemical structure, provides the necessary viscosity control and ejection stability without interfering with the reactive dye's performance, thus preventing unwanted side reactions while maintaining pattern clarity.
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 Z 1 value expressed by the following equation (1) of 18 or less. The total content Z 2 of solvent A and solvents B in the ink composition is 3.8% by mass or more. Z 1 = ˆ‘ i = 1 n 100 * Ii * Xi 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.