Textile Inkjet Pretreatment Composition for Bleeding and Colorfastness
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Solution Overview
Problem
Inkjet textile printing with water-insoluble colorants faces issues of 'bleeding' and reduced color development due to lack of aggregation action in pretreatment liquids, resulting in noticeable color differences and low colorfastness.
Innovation Solution
A pretreatment liquid containing a cationic polymer, a (meth)acrylate-based vinyl copolymer, and a crosslinking agent in specific ratios, applied to the fabric to enhance color development and water resistance, while minimizing treatment marks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water-insoluble colorants are used in inkjet textile printing, then colorfastness and light resistance are improved, but bleeding occurs and color development is reduced
Solution Approach 1:
A pretreatment liquid containing a cationic polymer and a (meth)acrylate-based vinyl copolymer is applied as an intermediary layer before printing with water-insoluble colorants. The cationic polymer aggregates the colorants through electrostatic interaction, while the vinyl copolymer forms a film that prevents bleeding into the fabric, thus resolving the contradiction between colorfastness and bleeding control.
Solution Approach 2:
The pretreatment liquid uses a composite system combining a cationic polymer and a (meth)acrylate-based vinyl copolymer in specific ratios. This composite approach allows the cationic polymer to provide aggregation action for color development while the vinyl copolymer provides water resistance and prevents bleeding, achieving both improved colorfastness and reduced bleeding simultaneously.
2Reliability
If a pretreatment liquid with aggregation action is used to improve color development, then colorfastness improves, but treatment marks become noticeable due to large color differences
Solution Approach 1:
The patent optimizes the concentration ratios of the cationic polymer and (meth)acrylate-based vinyl copolymer in the pretreatment liquid, and controls the solid content within a specific range. These parameter adjustments ensure sufficient aggregation action for color development while minimizing the visual contrast between treated and untreated areas, thus reducing treatment marks.
Solution Approach 2:
The pretreatment liquid is designed to provide localized aggregation action where needed for color development while maintaining overall uniformity. The controlled composition allows the aggregation to occur primarily in the printed areas rather than creating visible treatment marks across the entire fabric surface.
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 excellent color development and water resistance on printed materials with reduced treatment marks, improving the overall quality and stability of inkjet textile printing.
Implementation Method 1
a cationic polymer... produces a pretreatment solution with excellent color development... aggregation action of a pretreatment liquid
Implementation Method 2
a crosslinking agent... excellent water resistance on printed material... improve colorfastness
Data Source
AI summary
To provide a pretreatment liquid for inkjet textile printing, having excellent color development in the inkjet textile printing process, excellent color fastness to washing on printed fabrics, and little pretreatment trace residue. The solution therefor is a pretreatment liquid for inkjet textile printing containing 100 parts by mass of a cationic polymer (A), 5 parts by mass or more and less than 100 parts by mass of a (meth)acrylate-based vinyl copolymer (B), and 2 parts by mass or more and less than 30 parts by mass of a crosslinking agent (C), each being in solid content, and water, the liquid having a solid content by weight of 2 mass % or more and 30 mass % or less.