High glossy two-pack PU clear coat, fast drying, based on Macrynal SM 510n

This formulation is for an industrial coating, specifically a high glossy two-pack polyurethane (PU) clear coat designed for fast drying. It's based on Macrynal SM 510n and Desmodur N 75. Here's the breakdown:

Component 1:

• Macrynal SM 510n (86.10%)
• Methoxy propyl acetate, Xylene, Butyl acetate
• Tinuvin 292, Tinuvin 384-2, Tinuvin 1130
• Borchi® Gol LA 2
• Borchi® Kat 0244, Borchi® Kat 315 EU
• Diethylethanolamin

Component 2:

• Desmodur N 75 (34.80%)
• Macrynal SM 510n
• Solvent mixture: Butyl acetate, Solvesso 100, Xylene

Mixing Ratio:

• Component 1: Component 2 = 100 : 76.10 (by weight)

Application:

• Spray-gun

Technical Data:

• Spray viscosity (DIN 53211-cup 4mm): approx. 20 s
• Cross-linking ratio: approx. 100%
• Solid content on application: approx. 45%
• Pot life (at room temperature): approx. 7 hours
• Drying time (23°C, degree 1): approx. 30 minutes
• Drying time (23°C, degree 3): approx. 2 hours
• Film hardness (after 1 day): approx. 88 s (pendulum hardness tester-König, DIN EN ISO 1522)
• Film hardness (after 7 days): approx. 212 s (pendulum hardness tester-König, DIN EN ISO 1522)
• Gloss (20°/60° angle/Haze): 88.5 / 92.4 / 15.2 (DIN 6730 / ISO 2813)

Suppliers:

• Allnex, BASF, Milliken, Covestro