Crosslinker for polyurethane powder coatings
Description
AHA6630 is a Caprolactam blocked cycloaliphatic polyisocyanate, as a hardener for polyurethane powder coatings. The unblocking temperature >170°C.
Typical properties
| Appearance | Slightly yellow granular solid |
| Total NCO content(%) | 14-16 |
| Free NCO content(%) | ≤1 |
| NCO equivalent (g/Eq) | 275 |
| Tg(°C) | 45-55 |
| Melting range(°C) | 60-80 |
Application
AHA6630 is a hardener for OH-terminated polyester to achieve weather-resistant decorative powder coatings with excellent physical properties. NCO: OH=1:1 is recommended for optimum film properties. Slight undercrosslinking (NCO: OH=0.8:1) is possible depending on the co-reactants used and the film properties required.
Cure cycle: 20mins at 180°C or 10mins at 200°C
Process & Formulations
AHA6630 is added to the binder/pigment blend before extrusion.
Recommendations to design formulation as below:
| NCO:OH | 1:1 | 0.8:1 | |||
| AHA6630 | 13 | 20 | 11 | 17 | Part by weight |
| OH value=30 | 87 | / | 89 | / | Part by weight |
| OH value=50 | / | 80 | / | 83 | Part by weight |
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TDS AHA6630
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