UV-Curable Metallic Coatings for High Gloss and Fast Curing
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Solution Overview
Problem
Current methods for achieving high gloss metallic finishes on substrates are inefficient, as they often require physical drying or thermal curing, leading to increased costs, energy consumption, and waste, while also struggling to maintain high gloss levels and shelf-stability in water-based systems.
Innovation Solution
A UV-curable metallic composition comprising leafing metallic pigment flakes, acrylate oligomers/monomers, initiators, and a tertiary amine cure accelerator, which provides a high gloss finish exceeding 190 GU and maintains shelf-stability, allowing for fast curing without physical drying or thermal curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If solvent-based metallic coatings are used to achieve metallic finish, then metallic appearance is obtained, but physical drying or heat curing is required which increases energy consumption and processing time
Solution Approach 1:
The patent changes the curing mechanism from thermal/physical drying to UV photopolymerization. The composition uses UV-curable resins (acrylates, epoxies) and photoinitiators that cure upon UV exposure, eliminating the need for thermal drying ovens and significantly reducing energy consumption while maintaining metallic appearance
Solution Approach 2:
The patent replaces the thermal/mechanical drying system with a photochemical curing system. Instead of using heat and time for evaporation, UV light triggers rapid polymerization of the binder system, substituting a high-energy thermal process with a lower-energy optical process
2Use of energy by moving object
If water-based metallic coatings are used to reduce energy consumption, then energy efficiency is improved, but gloss level drops below high brilliant finish standards
Solution Approach 1:
The patent creates a composite UV-curable system combining multiple resin types (acrylates, epoxies, polyesters) with metallic flake pigments. This composite formulation achieves both high energy efficiency through UV curing and high gloss finish (>190 GU) by optimizing the resin matrix that carries and displays the metallic flakes
Solution Approach 2:
The patent changes the chemical composition parameters by selecting specific UV-curable resins with appropriate refractive indices and flow properties. The inclusion of reactive diluents and crosslinking agents optimizes both the curing efficiency and the optical properties to achieve high gloss while maintaining energy efficiency
3Speed
If UV-curable composition with high initiator loading is used to achieve fast curing, then cure speed is improved, but shelf-stability decreases due to premature gellation
Solution Approach 1:
The patent uses a balanced amount of photoinitiator (0.1-5% by weight) rather than excessive loading. This partial action approach provides sufficient UV sensitivity for fast curing while avoiding premature polymerization during storage, maintaining shelf-stability
Solution Approach 2:
The patent introduces a latent catalyst or dormant species that remains inactive during storage but activates under UV light. This intermediary mechanism allows the composition to remain stable on the shelf while enabling rapid curing when exposed to UV, separating the storage state from the curing state
4Illumination intensity
If hot-stamping or foil application is used to achieve spot metallization, then metallic finish is obtained, but waste and additional processing steps increase cost and time
Solution Approach 1:
The patent extracts the metallic flake pigment from the foil or stamping material and incorporates it directly into the UV-curable coating composition. This allows spot metallization to be achieved in a single coating and curing step, eliminating separate foil application or hot-stamping operations and reducing both time and waste
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 UV-curable metallic composition achieves a high gloss finish comparable to foil-like finishes, maintains gloss over storage duration, and offers fast curing speeds similar to non-metallic UV-curable compositions, while being energy-efficient and environmentally friendly.
Implementation Method 1
UV curable compositions that form high gloss decorative metallic appearance on various substrates
Implementation Method 2
a cure accelerator that is a tertiary amine with a structure of: R1
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3A~3B
AI summary
The invention provides an ultraviolet light curable metallic composition, and articles made therewith. The UV-curable metallic compositions provide a high gloss metallic finish, retain the gloss level over storage duration, and maintain press and shelf stability, while maintaining fast cure speeds. The metallic finishes of the instant compositions have gloss above 190 GU measured at 60°.