Radiation Curable Gravure Ink Viscosity and Curing Speed
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Solution Overview
Problem
Current radiation curable gravure inks face challenges with high viscosity and slow curing speed, which hinder their adoption in high-speed printing applications and require improvements in adhesion, abrasion resistance, and storage stability.
Innovation Solution
A radiation curable gravure ink composition combining cationic and free radical polymerizable compounds, including oxetane-based and epoxy-based compounds, with specific photoinitiators and modified pigments, to reduce viscosity and enhance curing speed, adhesion, and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If radiation curable gravure ink is used, then VOC emission is reduced and environmental friendliness is improved, but viscosity is high and curing speed is slow
Solution Approach 1:
The patent employs a hybrid curing system combining cationic polymerizable compounds (oxetane-based and epoxy-based) with free radical polymerizable compounds. This composite approach leverages the advantages of both curing mechanisms: cationic curing provides excellent adhesion and abrasion resistance, while free radical curing contributes to faster curing speed and lower viscosity, thereby resolving the contradiction between environmental friendliness and curing performance
Solution Approach 2:
The patent optimizes the molecular structure and functional groups of the polymerizable compounds to adjust the ink's viscosity and reactivity parameters. By carefully selecting and proportioning different cationic and free radical polymerizable compounds along with their corresponding photoinitiators, the formulation achieves balanced flow properties and curing kinetics without compromising the low-VOC characteristic
2Strength
If radiation curable gravure ink is used, then adhesion and abrasion resistance are improved, but viscosity remains high affecting printability
Solution Approach 1:
The patent adjusts the molecular weight, functional group density, and chain structure of the polymerizable compounds to optimize the balance between adhesion strength and viscosity. The cationic polymerizable compounds provide excellent adhesion through their chemical reactivity with substrates, while the free radical component maintains lower viscosity for better flow and printability, allowing both requirements to be satisfied simultaneously
3Strength
If radiation curable gravure ink is used, then abrasion resistance is improved, but curing speed is slow reducing production efficiency
Solution Approach 1:
The hybrid curing system combines cationic polymerizable compounds (providing superior abrasion resistance through crosslinked network formation) with free radical polymerizable compounds (offering faster initial curing). This composite formulation enables the ink to achieve both high abrasion resistance and rapid curing, thereby improving production efficiency without sacrificing durability
Solution Approach 2:
The dual-curing mechanism ensures continuous and complementary polymerization reactions: free radical curing provides rapid initial set for quick production turnover, while cationic curing continues to develop the crosslinked network for enhanced abrasion resistance, maintaining useful action throughout the curing process to satisfy both speed and strength requirements
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 low viscosity, fast curing speed, excellent adhesion, and improved storage stability, enabling high-speed printing with good print quality and abrasion resistance, thus addressing the limitations of prior art.
Implementation Method 1
radiation curable gravure ink comprising the following components: a cationic polymerizable compound, a cationic photoinitiator
Data Source
AI summary
A radiation curable gravure ink, comprising: cationic polymerizable compound comprising a hydroxyl-containing oxetane-based compound and an alicyclic epoxy-based compound; a cationic photoinitiator; a pigment; and filler.