Water-based curing agent composition for epoxy coatings
The aqueous curing agent composition, comprising adducts of polyaminoamide and epoxide, polyoxyalkyleneamines, and alicyclic amines, addresses issues of water-based epoxy coatings by enhancing initial water resistance and mechanical properties, offering a safer and effective alternative to solvent-based coatings.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- EVONIK OPERATIONS GMBH
- Filing Date
- 2023-07-12
- Publication Date
- 2026-07-21
AI Technical Summary
Existing water-based epoxy coatings face challenges such as poor initial water immersion resistance, water spot resistance, bubbling, flash rusting, reduced corrosion resistance, and reduced adhesion in zinc-rich and zinc-free primers, particularly in metal coatings, limiting their broad application.
Aqueous curing agent composition comprising adducts of polyaminoamide and epoxide, polyoxyalkyleneamines, alicyclic amines, and water, which is prepared by mixing polyoxyalkylene amine and alicyclic amine with the adduct of polyaminoamide and epoxide, and adding water while stirring at 60 to 80°C, achieving a curing agent with improved initial film performance.
The composition exhibits excellent initial water spot resistance and water immersion resistance, maintaining performance comparable to solvent-based epoxy resin coatings while reducing toxicity and improving mechanical properties.
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