Polyurethane Dispersion Balancing Color, Adhesion, and Fabric Followability
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Solution Overview
Problem
Existing polyurethane resins used in textile printing have a high aromatic ring concentration, leading to increased cohesive forces and reduced followability to fabric deformation, resulting in a trade-off between color developability and adhesion property.
Innovation Solution
A polyurethane dispersion with controlled acid value, urethane group and urea group concentrations, and aromatic ring concentration, optimized for textile printing, which enhances color developability, adhesion property, and followability by adjusting the resin's interaction with the fabric.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the aromatic ring concentration in the polyurethane resin is increased to enhance cohesive forces and color developability, then color developability is improved, but the resin becomes harder and followability to fabric deformation is reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the aromatic ring concentration within 5-15 mass%, the acid value within 7.0-14.0 mg KOH/g, and the total urethane and urea group concentrations within 20.0% by mass or less. These parameter optimizations balance the cohesive forces (for color developability) and followability (for adhesion), resolving the contradiction between strength and adaptability.
2Strength
If the fabric is pretreated to enhance interaction and improve color developability, then color developability is improved, but impregnation of the fabric with ink composition is suppressed and adhesion property is deteriorated
Solution Approach 1:
The patent resolves this contradiction by optimizing multiple resin parameters simultaneously: aromatic ring concentration (5-15 mass%) for color developability, acid value (7.0-14.0 mg KOH/g) for adhesion property, and total urethane and urea group concentrations (20.0% by mass or less) for followability. This multi-parameter optimization enables the resin to achieve both high color developability and good adhesion property even when fabric impregnation is suppressed.
3Strength
If the resin is made harder to increase cohesive forces, then color developability is improved, but the resin may peel off when fabric deforms
Solution Approach 1:
The patent applies parameter changes by controlling the aromatic ring concentration (5-15 mass%) to provide sufficient cohesive forces while limiting excessive hardening, and by optimizing the acid value (7.0-14.0 mg KOH/g) and total urethane and urea group concentrations (20.0% by mass or less) to maintain followability. This balanced parameter control prevents resin peeling during fabric deformation while maintaining high color developability.
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 optimized polyurethane dispersion achieves improved color developability, adhesion property, and followability to fabric deformation, while maintaining nozzle ejecting properties and preventing resin peeling.
Implementation Method 1
the polyisocyanate component and a polyol component containing a macropolyol and a hydrophilic group-containing active hydrogen compound
Implementation Method 2
the polyurethane resin is a reaction product of an isocyanate group-terminated prepolymer and a chain extender
Implementation Method 3
a polyurethane dispersion comprising a polyurethane resin dispersed in water
Data Source
AI summary
A polyurethane dispersion consists of a polyurethane resin dispersed in water. The polyurethane resin is a reaction product of an isocyanate group-terminated prepolymer and a chain extender. The isocyanate group-terminated prepolymer is a reaction product of a polyisocyanate component and a polyol component containing a macropolyol and a hydrophilic group-containing active hydrogen compound. The macropolyol contains an aromatic ring-containing polyester polyol. The polyurethane resin has an acid value of 7.0 mg KOH/g or more and 14.0 mg KOH/g or less. The total of the urethane group concentration and the urea group concentration of the polyurethane resin is 20.0% by mass or less. The polyurethane resin has an aromatic ring concentration of 5.0% by mass or more and 15.0% by mass or less.