Acrylamide Ink Composition for Stable Inkjet Ejection and Hard Cured Products
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Solution Overview
Problem
Radical polymerizable inks used in inkjet printing systems face challenges with high viscosity and poor ejection stability, which hinder the achievement of high hardness in cured products due to the use of polyfunctional monomers, and result in internal stress and curing shrinkage issues.
Innovation Solution
A composition combining an acrylamide compound with a molecular weight of 150-250 g/mol and a trifunctional or higher polymerizable compound, where the trifunctional compound constitutes 1-30% of the total composition, to achieve low viscosity and high curability while forming a cured product with high hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyfunctional monomers are used to improve curability and hardness, then curability and hardness are improved, but viscosity increases and ejection stability deteriorates
Solution Approach 1:
The patent changes the molecular weight parameter of the polyfunctional monomer to a specific range (150-250 g/mol), which fundamentally alters the balance between curability and viscosity. This parameter change enables the monomer to provide sufficient reactivity for high curability while maintaining lower viscosity for good ejection stability, directly resolving the technical contradiction.
Solution Approach 2:
The patent creates a composite ink formulation combining polyfunctional monomers with specific molecular weight characteristics. By carefully selecting and combining monomers within the specified molecular weight range, the formulation achieves both high curability and low viscosity, effectively resolving the contradiction between these opposing properties.
2Strength
If polyfunctional monomers are used to improve curability, then curability is improved, but internal stress and curing shrinkage increase
Solution Approach 1:
The patent applies parameter changes by restricting the molecular weight of polyfunctional monomers to 150-250 g/mol. This specific parameter range controls the degree of polymerization and network formation, achieving high curability while limiting excessive crosslinking that would cause internal stress and shrinkage, thus resolving the contradiction.
3Force
If high molecular weight polyfunctional monomers are used to reduce viscosity, then viscosity is reduced, but curability and hardness deteriorate
Solution Approach 1:
The patent identifies and applies a critical parameter change by setting the molecular weight range at 150-250 g/mol. This specific range optimization allows the monomer to maintain low enough viscosity for good flow and ejection properties while retaining sufficient reactivity and polymerization capability to achieve high curability and hardness, directly resolving the contradiction between viscosity and curability.
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 effectively reduces viscosity, enhances curability, and produces a cured product with improved hardness and reduced internal stress, making it suitable for inkjet printing systems.
Implementation Method 1
radical polymerizable inks or cationic polymerizable inks have been used... a polymerizable monomer, such as acrylic acid ester, and a polymerization initiator that generates radicals when active energy rays are applied
Data Source
AI summary
Provided is a composition including an acrylamide compound (A1) having a molecular weight of 150 or greater but 250 or less, and a trifunctional or higher polymerizable compound (A2), wherein an amount of the trifunctional or higher polymerizable compound (A2) is 1% by mass or greater but 30% by mass or less relative to a total amount of the composition.