Hard-coat Composition for Metal Substrate with Hybrid Curing
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Solution Overview
Problem
Existing hard coating materials for metal base materials face challenges with adhesion, particularly in water-resistant adhesion, and productivity, as they either require long curing times or have inferior adhesion to metal surfaces.
Innovation Solution
A hard coat coating composition combining urethane (meth)acrylate with a carboxyl group, urethane (meth)acrylate without a carboxyl group, a thermoplastic resin with a carboxyl group, and a silane coupling agent, which can be cured with an active energy beam, enhancing initial and water-resistant adhesion while maintaining favorable productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat-curable coating materials are used, then adhesion to metal base material is improved, but curing time increases reducing productivity
Solution Approach 1:
The patent combines heat-curable components (polyester polyol, polyisocyanate) with active energy beam-curable components ((meth)acrylate compounds, photopolymerization initiator) into a single hybrid coating composition. This merging allows the coating to achieve both good adhesion from the heat-curable portion and fast curing from the active energy beam-curable portion, resolving the contradiction between adhesion and productivity
Solution Approach 2:
The coating composition uses a composite system containing multiple types of resins and curing agents that can cure through both thermal and photopolymerization mechanisms. The polyester polyol and polyisocyanate provide adhesion properties, while the (meth)acrylate compounds enable rapid active energy beam curing, creating a composite material that satisfies both requirements
2Productivity
If active energy beam-curable coating materials are used, then productivity is improved with fast curing, but adhesion to metal base material deteriorates
Solution Approach 1:
The patent merges active energy beam-curable components ((meth)acrylate compounds for fast curing) with heat-curable components (polyester polyol and polyisocyanate known for adhesion). This combination allows the coating to cure rapidly under active energy beam while the heat-curable portion ensures good adhesion to metal substrates, resolving the contradiction between productivity and adhesion
3Strength
If conventional hard coating materials are used, then scratch resistance is achieved, but water-resistant adhesion deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the coating by incorporating polyester polyol with specific hydroxyl value and polyisocyanate components that enhance both hardness and water resistance. The specific ratio and selection of these components allow the coating to maintain scratch resistance while improving water-resistant adhesion through enhanced crosslinking and polarity
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 achieves superior adhesion to metal base materials, both initially and under water resistance tests, with improved productivity, making it suitable for applications on metals like aluminum, iron, or chrome.
Implementation Method 1
active energy beam-curable component (A) including a (meth)acrylate compound and a photopolymerization initiator
Implementation Method 2
a silane coupling agent (D)
Data Source
AI summary
A hard coat coating composition for a metal base material, includes a coated film forming component including a urethane (meth)acrylate (A) having a carboxyl group and having a solid fraction acid value being value of 0.5 to 2.0 mgKOH/g, a urethane (meth)acrylate (B) not having a carboxyl group, a thermoplastic resin (C) having a carboxyl group and having a solid fraction acid value of 1.0 to 30 mgKOH/g, and a silane coupling agent (D).