Photocurable Ink Composition for Metal Adhesion and Heat Resistance
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Solution Overview
Problem
UV-curable inkjet inks containing acid-modified acrylic monomers lack sufficient adhesion and heat resistance when used on metal surfaces, such as metal sheets.
Innovation Solution
A photocurable inkjet printing ink composition is developed, comprising 0.1% by mass or more of an acid-modified acrylic monomer and 10 to 30% by mass of a monofunctional monomer with a glass transition temperature (Tg) of 100°C or above, where the monofunctional monomer accounts for 80% or more of all monomers, along with a photopolymerization initiator and optional extender pigments, to enhance adhesion and heat resistance on metal surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If acid-modified acrylic monomers are used in UV-curable inkjet inks, then the inks can be used for offset printing on paper, but they lack sufficient adhesion and heat resistance on metal surfaces
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific monofunctional monomer with Tg of 100°C or above (such as acryloyl morpholine, dicyclopentanyl methacrylate, or isobornyl methacrylate) at 10-30 mass% of the total composition. This parameter change transforms the ink from having poor metal adhesion to achieving excellent adhesion and heat resistance while maintaining offset printing capability
Solution Approach 2:
The patent creates a composite monomer system combining acid-modified acrylic monomer (0.1-5 mass%) with monofunctional monomer (10-30 mass%) having high glass transition temperature. This composite approach integrates the paper-printing suitability of acid-modified acrylic monomer with the metal adhesion and heat resistance properties of high-Tg monofunctional monomer
2Adaptability or versatility
If acid-modified acrylic monomers are used in UV-curable inkjet inks, then the inks can be used for offset printing on paper, but they lack sufficient heat resistance on metal surfaces
Solution Approach 1:
The patent introduces a critical parameter - the glass transition temperature (Tg) of the monofunctional monomer - and sets it at 100°C or above. This parameter change directly addresses the heat resistance deficiency, as the high-Tg monomer structure provides thermal stability that prevents ink degradation and maintains adhesion at elevated temperatures on metal substrates
Solution Approach 2:
The composite monomer system combines the low-Tg acid-modified acrylic monomer (which provides paper compatibility) with high-Tg monofunctional monomer (which provides heat resistance). The synergistic interaction between these components creates an ink formulation that simultaneously achieves broad printing adaptability and superior thermal performance on metal surfaces
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 demonstrates significant improvements in adhesion and heat resistance on metal surfaces, maintaining performance even after storage and exposure to heat, while maintaining discharge stability and safety.
Implementation Method 1
photocurable inkjet printing ink composition
Data Source
AI summary
An object is to provide an ink composition for inkjet printing that permits inkjet printing, particularly on metal surfaces, wherein such ink composition possesses sufficiently high adhesion and heat resistance with respect to metal surfaces. As a means for achieving the object, a photocurable inkjet printing ink composition is provided, which contains, relative to the entire ink composition, 0.1 percent by mass or more of an acid-modified acrylic monomer and 10 to 30 percent by mass of a monofunctional monomer with a Tg of 100°C or above, wherein the monofunctional monomer accounts for 80 percent by mass or more of all monomers.