Inkset for ink jet textile printing and ink jet textile printing method
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Solution Overview
Problem
Ink jet textile printing methods using pigments face issues with aggregate formation due to resin content, leading to poor fixation and friction resistance, especially on fabrics that expand or contract, and require additional resin to improve image stability on washable clothing.
Innovation Solution
An inkset comprising a first ink with a pigment and resin, and a second ink with a pigment, resin, and an emulsifier, where the emulsifier includes anionic and nonionic types with specific HLB values, is used to form a base layer and a secondary image, respectively, to suppress aggregate formation and enhance friction resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pigment is used as a coloring matter in ink jet textile printing, then light resistance of the recorded image is improved, but aggregates due to resin are easily generated near the nozzle or in the ink supply passage
Solution Approach 1:
The patent changes the chemical parameters of the resin by specifying particular types (polyester resin, polyurethane resin, acrylic resin) and controlling their molecular weight and functional groups. This modifies the resin's interaction with pigment particles, reducing aggregation while maintaining light resistance.
Solution Approach 2:
The patent creates a composite ink formulation combining pigment, resin, and water in specific proportions. The resin acts as a binder that holds pigment particles together and to the fabric, while the water-based medium prevents premature aggregation. This composite structure resolves the contradiction between light resistance and aggregate formation.
2Reliability
If the amount of resin in the ink is increased to improve fixation of the image on cloth, then friction resistance is improved, but aggregates due to resin are more easily generated
Solution Approach 1:
The patent optimizes the resin content to a specific range (5-20% by mass) and changes the resin's chemical parameters by selecting specific resin types with appropriate molecular weights and functional groups. This allows sufficient fixation without excessive aggregation.
Solution Approach 2:
The patent applies different resin types in specific combinations (polyester resin, polyurethane resin, acrylic resin) to achieve localized optimization. Each resin type contributes differently to fixation and aggregate prevention, allowing the formulation to balance both requirements.
3Adaptability or versatility
If a soft resin with low glass transition temperature is added to the ink to make the recorded image follow the cloth expansion and contraction, then adaptability to fabric movement is improved, but aggregates due to resin are generated more frequently
Solution Approach 1:
The patent changes the glass transition temperature parameter of the resin by selecting specific resin types (polyester resin, polyurethane resin, acrylic resin) with appropriate Tg values. This allows the resin to be soft enough to follow fabric movement while maintaining stability against aggregation.
Solution Approach 2:
The patent uses a composite resin system combining multiple resin types with different properties. This composite approach allows the formulation to achieve both flexibility (to follow fabric movement) and stability (to prevent aggregation) that single-resin systems cannot provide.
4Ease of manufacture
If dye is used as a coloring matter in ink jet textile printing, then ease of application is improved, but light resistance of the recorded image is not excellent
Solution Approach 1:
The patent segments the coloring function from the binding function. The pigment provides light resistance while the resin binder ensures easy application and fixation. This segmentation allows each component to optimize its specific function without compromise.
Solution Approach 2:
The patent creates a composite ink system where pigment particles are dispersed in a water-based resin medium. This composite structure combines the light resistance of pigment with the ease of application and fixation of resin, resolving the contradiction between these two properties.
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 inkset effectively reduces aggregate formation and improves image fixation and friction resistance, ensuring high-quality prints that follow fabric expansion and contraction while maintaining ink stability and visibility.
Implementation Method 1
an inkset for ink jet textile printing which includes a first ink having a pigment and a resin; and a second ink having a pigment, a resin and an emulsifier
Implementation Method 2
an emulsifier includes at least one kind selected from an anionic emulsifier and a nonionic emulsifier whose HLB value is 12 or more
Data Source
AI summary
An inkset for ink jet textile printing includes a first ink having a pigment and a resin; and a second ink having a pigment, a resin, and an emulsifier, in which the emulsifier includes at least one kind selected from an anionic emulsifier represented by the following general formula (1) and a nonionic emulsifier represented by the following general formula (2), whose HLB value is 12 or more,R1—O—(CH2—CH2—O)n-A (1), andR2—O—(CH2—CH2—O)m—H (2).