Tung Oil Acid Anhydride (TOPA) Reactive Diluent / Curing Agent
On RequestMOQ
200 kg
Lead Time
15–25 days
Packaging
200 kg steel drums (nitrogen-protected)
Specifications
| Acid Value | ≤5 mg KOH/g |
| Iodine Value | 90–130 g I₂/100g |
| Bio-Based Content | ≥80% |
| Viscosity (25°C) | 500–2000 mPa·s |
| Anhydride Equivalent Weight | 290–340 g/eq |
FAQ
The long C18 fatty acid chain derived from tung oil introduces a flexible aliphatic spacer into the epoxy network between crosslink junctions. Compared to all-aromatic or alicyclic anhydrides, TOPA-containing systems show dramatically lower Young's modulus (flexible) and higher elongation at break (5–15% vs 1–3% for rigid systems), while retaining good chemical resistance. TOPA is suitable as a partial replacement (20–40% of total anhydride) to flexibilise brittle high-Tg epoxy coatings on flexible steel substrates.
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