Inkjet Ink Resin Storage Modulus and Adhesion
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Solution Overview
Problem
Conventional inkjet recording methods and ink sets face challenges with storage stability and discharge stability, leading to impaired transparency, visibility issues, and insufficient image adhesiveness on coated papers, plastic films, and fabrics, particularly in the textile printing field where fastness properties like friction and washing fastness are not adequately met.
Innovation Solution
The development of an inkjet ink containing a specific resin with a structural unit represented by the formula (CH2CH2O)n, where n is an integer of 5 to 100, and a polyvalent metal ion, which results in a dried film with a storage modulus of 1.0×10^8 Pa or lower, enhancing storage and discharge stability, and providing high color developing and fastness properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional inkjet recording methods are used, then printing can be performed on coated papers, plastic films, and fabrics, but storage stability and discharge stability are insufficient, leading to impaired transparency and visibility
Solution Approach 1:
The patent changes the chemical composition parameters of the ink by incorporating specific resin components (polyester resin, polyurethane resin, acrylic resin) in controlled ratios, along with polyvalent metal ions and surfactants. This composition optimization resolves the contradiction by achieving both storage stability and transparency simultaneously
Solution Approach 2:
The patent uses a composite ink formulation combining multiple resin types (polyester, polyurethane, acrylic), polyvalent metal ions, and surfactants. This composite approach allows the ink to exhibit both storage stability and discharge stability while maintaining transparency on various substrates
2Reliability
If conventional inkjet recording methods are used, then printing can be performed on fabrics, but image adhesiveness and fastness properties are insufficient
Solution Approach 1:
The patent optimizes the chemical composition by incorporating specific resin types and ratios, along with polyvalent metal ions that enhance adhesion. This parameter optimization allows the ink to achieve both discharge stability and strong image adhesiveness on fabric substrates
Solution Approach 2:
The resin components act as intermediaries between the ink and fabric substrate, providing both discharge stability and strong adhesion. The polyvalent metal ions further enhance this intermediary function by forming strong bonds with both the resin and the fabric fibers
3Reliability
If conventional inkjet recording methods are used, then printing can be performed on plastic films, but color developing properties are insufficient
Solution Approach 1:
The patent adjusts the chemical parameters of the ink by incorporating specific resin components and surfactants that enhance color development on non-porous surfaces like plastic films. This composition optimization maintains storage stability while significantly improving color developing properties
Solution Approach 2:
The surfactant and resin components act as intermediaries that facilitate better interaction between the ink and plastic film surface. This intermediary layer enhances color development while the overall formulation maintains storage stability
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 storage and discharge stability, along with improved image adhesiveness and fastness properties on coated papers, plastic films, and fabrics, ensuring high-quality image formation with enhanced durability and resistance.
Implementation Method 1
A dried film obtained by drying the resin having the structural unit represented by the general formula (1) has a storage modulus of 1.0×10^8 Pa or lower in a dynamic viscoelasticity measurement at 25 degrees C.
Data Source
AI summary
An inkjet ink comprising a resin and a polyvalent metal ion is provided. The resin contains a resin (1) having a structural unit represented by the following general formula (1):—(CH2CH2O)n— general formula (1)where n represents an integer of 5 to 100. A dried film obtained by drying the resin having the structural unit represented by the general formula (1) has a storage modulus of 1.0×108 Pa or lower in a dynamic viscoelasticity measurement at 25 degrees C.