Textile Printing Ink Set for Dye Fixation Without Color Bleeding
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Solution Overview
Problem
Existing textile printing methods face challenges in preventing color staining and bleeding of inks on other textiles, particularly with the use of cationic polymers which can lead to undesirable migration of dyes during washing.
Innovation Solution
A textile printing ink set comprising a pretreatment liquid with a cationic compound of specific molecular weight and a water-insoluble dye, along with a dispersing agent, applied using an ink jet process to ensure strong fixation of the dye on the textile, reducing the likelihood of color staining and bleeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cationic polymers are used for textile printing, then dye fixation is achieved, but color staining and bleeding occur on other textiles
Solution Approach 1:
The patent changes the molecular weight parameter of the cationic polymer from conventional high molecular weight to specifically 10,000 to 200,000, which optimizes the balance between dye fixation capability and prevention of color migration. This parameter adjustment allows the polymer to effectively bind dyes while reducing their tendency to stain or bleed onto other textiles.
Solution Approach 2:
The invention uses a composite system consisting of a cationic polymer with specific molecular weight characteristics combined with water-insoluble dyes. This composite approach creates a synergistic effect where the polymer provides fixation while its controlled molecular structure prevents excessive binding that would cause staining, thereby resolving the contradiction between effective fixation and preventing harmful color transfer.
2Manufacturing precision
If pretreatment liquid is applied before ink to obtain sharp images, then image quality improves, but process complexity increases
Solution Approach 1:
The patent combines the pretreatment liquid application and ink printing into an integrated inkjet printing system. The pretreatment liquid is applied first to prepare the textile surface for sharp image formation, and then the ink is applied in the same printing process, merging two steps into a coordinated sequence that maintains image quality while managing process complexity through integration.
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 effectively minimizes color transfer to other textiles and bleeding by ensuring strong dye fixation, enhancing the durability and cleanliness of printed textiles.
Implementation Method 1
a pretreatment liquid including a cationic compound having a molecular weight per cationic valence of 150 to 220
Implementation Method 2
an ink composition including a water-insoluble dye, a dispersing agent, and water
Implementation Method 3
the dispersing agent is at least one selected from the group consisting of a urethane resin, a urea resin, and a urethane-urea resin
Implementation Method 4
applying the ink composition included in the ink set according to any one of <1> to 9>, to the textile to which the pretreatment liquid has been applied
Data Source
AI summary
Provided are a textile printing ink set including a pretreatment liquid including a cationic compound having a molecular weight per cationic valence of 150 to 220, and an ink composition including a water-insoluble dye, a dispersing agent, and water, wherein the dispersing agent is at least one selected from the group consisting of a urethane resin, a urea resin, and a urethane-urea resin; and a textile printing method.