Ink set and image formation method
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Solution Overview
Problem
Water-based inks containing polymerizable compounds often suffer from poor liquid stability, leading to precipitation issues, and struggle to retain the surface irregularity texture of substrates like leather, while traditional inks with solvents provide better stability but lack surface-irregularity-texture retainability and rubfastness.
Innovation Solution
An ink set comprising a color ink and an overcoat solution, both containing water and polymerizable compounds, with specific polymerizable polymers and initiators, applied in a method that ensures high liquid stability and retention of substrate texture, including a step for forming an overcoat layer to enhance rubfastness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If water-based inks containing polymerizable compounds are used, then VOC emission is reduced, but liquid stability deteriorates causing precipitation
Solution Approach 1:
The patent changes the chemical parameters of the polymerizable compound by specifying functional group types (carboxyl, hydroxyl, amino groups) and molecular weight ranges (1000-10000). These parameter modifications enable the polymerizable compound to maintain stability in water-based ink while still providing curability, thus resolving the contradiction between VOC reduction and liquid stability.
Solution Approach 2:
The patent creates a composite ink formulation combining water, polymerizable compounds with specific functional groups, colorants, and other components in precise proportions. This composite approach allows the ink to achieve both environmental benefits (low VOC) and technical performance (high liquid stability) by synergistic interaction of components.
2Reliability
If ink mainly containing polymerizable monomer is used, then curability is improved, but surface-irregularity-texture retainability deteriorates
Solution Approach 1:
The patent modifies the molecular weight parameter of the polymerizable compound to a specific range (1000-10000), which is higher than typical monomers. This parameter change reduces film thickness while maintaining curability, allowing the ink to penetrate substrate irregularities effectively and retain surface texture.
Solution Approach 2:
The patent introduces functional groups (carboxyl, hydroxyl, amino) that provide localized interaction with substrate surfaces. These functional groups enhance adhesion to irregular surfaces while the controlled molecular weight ensures appropriate film formation, resolving the contradiction between curability and texture retention.
3Object-generated harmful factors
If water-based ink with polymerizable compound is used, then environmental compatibility is improved, but rubfastness deteriorates
Solution Approach 1:
The patent formulates a composite ink system combining water, specifically selected polymerizable compounds with functional groups, colorants, and additives in controlled proportions. This composite structure provides both environmental compatibility (water-based, low VOC) and mechanical durability (high rubfastness) through synergistic component interactions.
Solution Approach 2:
The patent optimizes molecular weight (1000-10000) and functional group composition of the polymerizable compound to achieve balanced performance. These parameter adjustments ensure sufficient crosslinking density for rubfastness while maintaining water-based environmental compatibility.
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 set achieves high liquid stability, retains the surface irregularity texture of substrates, and provides improved rubfastness by forming a durable overcoat layer, suitable for applications on leather products.
Implementation Method 1
irradiation with ultraviolet radiation to achieve printing
Data Source
AI summary
An ink set including a color ink containing particles including a polymerizable compound, a colorant, and water and an overcoat solution containing particles including a polymerizable compound and water, and an image formation method.