White High-Gloss 2K Polyurethane Topcoat for Automotive 5.6.

This is a formulation for an automotive coating, specifically a water-thinnable white two-pack polyurethane (PU) topcoat. It is based on Bayhydrol A 145 and Bayhydur 304. Here's a breakdown:

Components:

• Component 1: Bayhydrol A 145, Surfynol 104 BC, Borchi® Gel THIX 921, Borchi® Gol LA 200, Borchi® Gen 0851, Sachtleben R-KB-4.
• Component 2: Bayhydur 304, Butoxyl (Methoxy butyl acetate).
• Water (for thinning).

Production:

• Component 1 is placed in a mixing vessel and mixed with components 2-6 for 20 minutes at 2000 rpm for pre-dispersion, followed by dispersion for 60 minutes in a bead mill. It's then left to rest for one day for deaeration.
• Component 2 is stirred for approximately 10 minutes in a dissolver for incorporation.
• Water is added to adjust the spray viscosity.

Data:

• NCO : OH - ratio is 1.5 : 1.
• Spray viscosity: approximately 28 seconds (DIN 53211-cup 4mm, at 23 °C).
• Pendulum hardness (König method) for wet film thicknesses of 100 µm on glass: 64 / 95 / 118.
• Haze and Gloss (20°/60° angle): 10 / 76 / 85.

Suppliers:

• Covestro, Air Products, Milliken, Sachtleben.