Photocurable Aqueous Ink Composition for Miscibility and Print Curability
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Solution Overview
Problem
Existing photocurable aqueous inkjet inks lack excellence in miscibility of components excluding pigments and pigment dispersants, curability during printing, and adhesion and water resistance of printed coating films.
Innovation Solution
A photocurable aqueous ink composition comprising water, a colorant, N-monosubstituted acrylamide, a water-soluble polymerizable compound, and a photoinitiator, with specific ratios and additives to enhance miscibility, curability, and adhesion and water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional photocurable aqueous inkjet inks are used, then environmental friendliness is improved by using water as solvent, but miscibility of components excluding pigments and pigment dispersants deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the aqueous system by introducing specific polymerizable compounds (N-monosubstituted acrylamide at 10-30% by mass relative to total photopolymerizable component) that are compatible with water as solvent. This parameter change enables both environmental friendliness through water-based formulation and improved miscibility through the specific chemical properties of the selected polymerizable compounds.
Solution Approach 2:
The patent creates a composite aqueous ink composition by combining water with specific photopolymerizable compounds (N-monosubstituted acrylamide, epoxy acrylate oligomer, and other water-soluble polymerizable compounds). This composite approach allows the system to achieve both environmental compatibility through water and compositional stability through the synergistic interaction of the selected compounds.
2Object-affected harmful factors
If conventional photocurable aqueous inkjet inks are used, then water content is increased for environmental benefits, but curability during printing deteriorates
Solution Approach 1:
The patent optimizes the concentration parameters of photopolymerizable compounds within specific ranges (N-monosubstituted acrylamide: 10-30% by mass, epoxy acrylate oligomer: 5-20% by mass, other water-soluble polymerizable compounds: 30-60% by mass). These parameter changes ensure sufficient curability during printing while maintaining high water content for environmental friendliness.
Solution Approach 2:
The patent employs a composite photopolymerization system using multiple types of polymerizable compounds with different curing characteristics. This composite approach ensures reliable curability during printing by combining the fast-curing properties of N-monosubstituted acrylamide with the crosslinking capabilities of epoxy acrylate oligomer and other water-soluble polymerizable compounds, all within a water-based formulation.
3Object-affected harmful factors
If conventional photocurable aqueous inkjet inks are used, then water content is increased for environmental benefits, but adhesion property and water resistance of printed coating film deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating epoxy acrylate oligomer (5-20% by mass) which provides excellent crosslinking density and adhesion. This parameter change enables the coating film to achieve strong adhesion and water resistance properties while maintaining the water-based environmentally friendly formulation.
Solution Approach 2:
The patent creates a composite crosslinked network structure by combining epoxy acrylate oligomer with N-monosubstituted acrylamide and other water-soluble polymerizable compounds. This composite material approach produces a printed coating film with enhanced adhesion property and water resistance, as the epoxy groups form strong crosslinks that improve mechanical strength and chemical resistance while the water-based formulation maintains environmental friendliness.
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 composition achieves excellent miscibility, curability, adhesion, and water resistance of printed coating films, addressing the limitations of previous inkjet inks.
Implementation Method 1
a photoinitiator
Data Source
AI summary
An object of the present invention is to provide a photocurable aqueous ink composition for inkjet printing that is excellent in all aspects including miscibility when components excluding pigments and pigment dispersants are mixed, curability during printing, adhesion property and water resistance of a printed coating film. As a solution, provided is a photocurable aqueous ink composition for inkjet printing including: water by 10.0 to 45.0% by mass in the photocurable aqueous ink composition for inkjet printing; a colorant; a water-soluble polymerizable compound containing N-monosubstituted acrylamide; and a photoinitiator.