Water-Based Inkjet Ink Composition for Beading and Blocking Resistance
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Solution Overview
Problem
Existing water-based inkjet inks fail to simultaneously achieve high ejection stability, beading suppression, and blocking resistance, especially on impermeable substrates.
Innovation Solution
A water-based inkjet ink composition comprising a specific acetylenediol surfactant with an HLB value of 10 or less, combined with alkanediol and glycol monoether, to control molecular weight and hydrophilicity/hydrophobicity, ensuring effective spreading and adhesion on impermeable substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional water-based inkjet ink is used on impermeable substrates, then the ink maintains high ejection stability, but the droplets do not spread to wet the substrate and beading occurs
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight and hydrophilicity/hydrophobicity balance of the acetylenediol surfactant. This optimization enables the ink to achieve both high ejection stability and effective spreading on impermeable substrates, resolving the contradiction between ejection stability and print quality.
2Stability of the object's composition
If the ink droplets land on impermeable substrates without penetration, then the droplets remain in a high surface tension state, but this results in insufficient drying and adhesion, causing blocking
Solution Approach 1:
The patent changes the chemical parameters of the ink by introducing an acetylenediol surfactant with specifically controlled molecular weight and HLB value. This enables the ink to achieve sufficient spreading and wetting on impermeable substrates while maintaining appropriate surface tension, thereby improving both drying performance and blocking resistance.
Solution Approach 2:
The patent uses a composite approach by combining the acetylenediol surfactant with alkanediol and glycol monoether in specific ratios. This composite formulation works synergistically to achieve both good ejection stability and effective substrate wetting, preventing blocking while maintaining ink stability.
3Stability of the object's composition
If surfactants or water-soluble organic solvents are added to reduce surface tension, then the ink should spread better, but the droplets cannot sufficiently spread within the short time between landings
Solution Approach 1:
The patent optimizes the molecular weight and hydrophilicity/hydrophobicity parameters of the acetylenediol surfactant to achieve the right balance between surface tension reduction and spreading speed. This enables rapid wetting of impermeable substrates within the brief time interval between droplet landings, while maintaining ejection 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 ink achieves excellent ejection stability, suppresses beading, and provides printed matter with superior blocking resistance on impermeable substrates.
Implementation Method 1
the droplets landed on the substrate, and being in a state with a high surface tension do not spread to wet the substrate
Implementation Method 2
As a method of improving print quality and blocking resistance (suppressing the occurrence of blocking), it is common to reduce the surface tension of water-based inkjet inks. For example, surfactants or water-soluble organic solvents are added to water-based inkjet inks to reduce the surface tension
Implementation Method 3
the surfactant (A) includes an acetylenediol surfactant (A1) having a structure represented by General Formula (1) described below, and having an HLB value of 10 or less
Data Source
AI summary
A water-based inkjet ink comprising a pigment, a surfactant (A), and a water-soluble organic solvent (B), in which the surfactant (A) includes an acetylenediol surfactant (A1) having an ethylene oxide structure and a propylene oxide structure, and having an HLB value of 10 or less; the water-soluble organic solvent (B) includes an alkanediol (B1) having 3 to 5 carbon atoms, and a glycol monoether (B2) having 4 to 10 carbon atoms; and a mass ratio ((B1)/(B2)) between a content of the alkanediol (B1) having 3 to 5 carbon atoms and a content of the glycol monoether (B2) having 4 to 10 carbon atoms is 0.8 to 12.