Waterborne Epoxy Resin Dispersion (Eco-Friendly Coating Grade)
Key Features
- Low VOC (<50 g/L) — compliant with EU, CARB, and China GB VOC regulations
- Stable aqueous dispersion (>12 months shelf life)
- Compatible with waterborne amine and polyamide hardeners
- Corrosion and chemical resistance comparable to solvent-borne systems
- Low odor for indoor application and residential compatibility
Waterborne Epoxy Resin Dispersion is a stable aqueous dispersion of BPA epoxy resin (EEW 450-550 g/eq based on solids) in water at 55-65% solids content. The dispersion is formulated with non-ionic surfactant emulsification for excellent stability (>12 months), low VOC content (<50 g/L), and compatibility with waterborne amine and polyamide hardeners to produce two-part waterborne epoxy coating and primer systems.
Waterborne epoxy systems are the primary VOC-compliant solution for industrial maintenance coatings, protective floor coatings, and concrete primers in regions with strict VOC regulations (EU, California CARB, China GB standards). The cured coating provides corrosion resistance, chemical resistance, and adhesion to steel, concrete, and other substrates comparable to solvent-borne epoxy at 60-70% of the VOC content.
Performance of waterborne epoxy is slightly lower than equivalent solvent-borne systems due to the water evaporation step required before cure and the surfactant residues remaining in the film. Salt spray resistance is typically 500-1000h (ASTM B117) versus 1000-3000h for solvent-borne equivalent primers. However, improved formulation technology has substantially closed this gap. Applications include water-based industrial floor coatings, metal corrosion-resistant primers for construction and OEM applications, concrete penetrating sealers, and waterborne adhesive primer systems.
Specifications
| Parameter | Value |
|---|---|
| pH | 6.5-8.0 |
| Appearance | Milky white dispersion |
| VOC Content | <50 g/L |
| Solids Content | 55-65 wt% |
| EEW (on solids) | 450-550 g/eq |
| Viscosity (25°C) | 1,000-5,000 mPa·s |
| Dispersion Stability | >12 months at 5-30°C |
Applications
FAQ
Waterborne epoxy dispersions use dedicated waterborne amine hardeners that are either water-soluble (polyamidoamine, polyethyleneamine adducts) or water-dispersible. The hardener must be compatible with the dispersion — mixing a solvent-borne amine hardener into a waterborne epoxy dispersion will break the emulsion. Recommended hardeners are water-soluble adducts of cycloaliphatic amines (IPDA-adduct, 30-40% water content) for good chemical resistance, or polyamidoamine dispersions for corrosion-resistant primers. Mix ratio: typically 2:1 to 5:1 (Part A dispersion:Part B hardener) by weight on solids content. After mixing, dilution with up to 5-10% water is allowed to adjust application viscosity.
Direct Contact
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