Hard Coating Composition for Metal Substrates
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Solution Overview
Problem
Conventional heat-curing coating compositions for metal substrates, such as aluminum, face challenges of low productivity and insufficient adherence properties, leading to inadequate abrasion and rust resistance.
Innovation Solution
A hard coating composition comprising a film-forming resin component with 30% or more urethane (meth)acrylate, using hydrogenated xylylene diisocyanate and/or dicyclohexylmethane diisocyanate, combined with active-energy ray-curable components and a photo-polymerization initiator, is applied to metal substrates and cured with active-energy rays to achieve excellent adherence and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat-curing coating composition is used, then abrasion resistance and rust resistance are improved, but curing time increases and productivity decreases
Solution Approach 1:
The patent changes the chemical parameters of the coating composition by incorporating specific reactive diluents (epoxy compounds with epoxide groups and/or isocyanate groups) that enable dual-curing mechanisms. This allows the coating to achieve both the durability of heat-curing and the speed of chemical curing by modifying the molecular structure and reactivity of the film-forming resin system
Solution Approach 2:
The patent creates a composite coating system combining multiple resin components (polyester resin, polyurethane resin), crosslinking agents (epoxy compounds), and reactive diluents that work synergistically. This composite formulation enables simultaneous achievement of adhesion, abrasion resistance, rust resistance, and rapid curing through multiple chemical mechanisms operating together
2Ease of manufacture
If conventional coating composition is used, then application is simple, but adherence properties to metal substrate are insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating epoxy compounds with specific epoxide groups and isocyanate groups that chemically bond to metal substrates. This changes the interaction mechanism from physical adhesion to chemical bonding, significantly improving adherence while maintaining ease of application through liquid coating formulation
Solution Approach 2:
The epoxy compound acts as an intermediary between the coating system and the metal substrate, providing chemical bridging through its epoxide and isocyanate groups that react with both the substrate surface and the resin matrix, thereby ensuring strong adherence without complicating the application process
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 solution enables the formation of a hard coat with superior adherence and resistance properties on metal substrates, enhancing productivity and maintaining performance even after water exposure, while being cost-effective.
Implementation Method 1
a photo-polymerization initiator; the coating composition consists of a film-forming resin component that contains a urethane (meth)acrylate (i) obtained by reacting a polyisocyanate compound, a polyol, wherein the polyol is 1,6-hexanediol, and a (meth)acrylate monomer having a hydroxyl group
Data Source
AI summary
The object of the present invention is to provide a hard coating composition for a metal substrate, including a film-forming resin component which contains a urethane (meth)acrylate obtained by reacting a polyisocyanate compound, a polyol, and a (meth)acrylate monomer having a hydroxyl group, wherein the polyisocyanate compound is hydrogenated xylylene diisocyanate and/or hydrogenated dicyclohexylmethane diisocyanate.