Urethane Resin Particle Textile Ink for Dyeing Fastness
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Solution Overview
Problem
Existing inkjet inks for textile printing lack the ability to effectively color various types of fabrics and provide excellent color developability and dyeing fastness, such as washing resistance, rub resistance, and perspiration resistance, while also suffering from issues like dye bleed and poor dispersibility of colored resin particles.
Innovation Solution
An inkjet ink formulation containing water, an aqueous organic solvent, and colored resin particles with a urethane resin and at least one type of dye (oil-soluble, disperse, or vat dye) is developed, where the urethane resin forms a film upon heating, enhancing color developability and dyeing fastness, and the acid value of the urethane resin is adjusted to maintain dispersibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional inkjet inks are used for textile printing, then the printing process is simple, but the dyeing fastness and color developability are insufficient
Solution Approach 1:
The patent uses composite resin particles comprising a urethane resin and a acrylic resin, where the urethane resin provides dyeing fastness and the acrylic resin provides color developability. This composite structure allows simultaneous achievement of multiple performance requirements that cannot be met by single-resin systems.
Solution Approach 2:
The patent specifies precise parameter ranges for the ink formulation, including resin particle size (0.1-10 μm), urethane resin content (30-80 mass%), and acid value (20-100 mg KOH/g). By optimizing these parameters, the ink achieves both excellent dyeing fastness and color developability while maintaining inkjet printability.
2Manufacturing precision
If high concentration of colored resin particles is used to improve color density, then color developability improves, but dispersibility deteriorates causing clogging
Solution Approach 1:
The patent controls the particle size of colored resin particles within 0.1-10 μm and maintains specific acid values (20-100 mg KOH/g) to prevent aggregation and maintain dispersibility even at high concentrations. This allows achieving high color density without clogging the inkjet system.
Solution Approach 2:
The patent introduces specific functional groups (carboxyl groups) on the surface of resin particles to enhance local dispersibility. The carboxyl groups create electrostatic repulsion between particles, preventing aggregation and maintaining stable dispersion at high concentrations.
3Reliability
If urethane resin is used to improve dyeing fastness, then washing resistance improves, but dispersibility of resin particles deteriorates
Solution Approach 1:
The patent creates a composite resin system where urethane resin particles (providing washing resistance) are combined with acrylic resin particles (providing dispersibility). The acrylic resin acts as a dispersing medium that prevents aggregation of urethane resin particles, allowing both functions to coexist.
Solution Approach 2:
The patent optimizes the acid value of the urethane resin to 20-100 mg KOH/g, which provides sufficient surface charge for dispersibility while maintaining the dyeing fastness properties of the urethane resin. This parameter optimization resolves the contradiction between fastness and dispersibility.
4Productivity
If polymer fine particles with small size are used to improve inkjet flowability, then clogging is prevented, but film formation ability deteriorates
Solution Approach 1:
The patent specifies an optimal particle size range of 0.1-10 μm for colored resin particles. This range is large enough to provide sufficient film formation ability upon heating, yet small enough to ensure smooth flow through inkjet nozzles and prevent clogging.
Solution Approach 2:
The patent utilizes thermal phase transition of the resin particles during the heating process. The resin particles are applied in a dispersed state at room temperature, then undergo phase transition upon heating to form a continuous film that provides both color and fastness 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 inkjet ink achieves excellent color developability and dyeing fastness on various fabrics, including washing resistance, rub resistance, and perspiration resistance, with minimal dye bleed and improved storage stability, while maintaining the dispersibility of colored resin particles.
Implementation Method 1
the urethane resin forms a film upon heating, enhancing color developability and dyeing fastness
Data Source
AI summary
According to the present invention, there are provided an inkjet ink for textile printing containing: water; an aqueous organic solvent; and colored resin particles, in which the colored resin particles contain a urethane resin and at least one type of dye selected from the group consisting of oil-soluble dyes, disperse dyes, and vat dyes, and the urethane resin has an acid value of 5 to 90 mgKOH/g, an ink cartridge filled with the inkjet ink for textile printing, an ink set, and an inkjet textile printing method having a step of directly printing the inkjet ink for textile printing on a fabric by an inkjet method.