Glossy two-pack PU clear coat, fast drying, for spray application, based on

Formulation for a glossy, fast-drying two-pack polyurethane (PU) clear coat, designed for spray application on wood and furniture. The formulation utilizes Setalux D A 450 BA/X as the primary resin and Desmodur N 75 as the curing agent. Here is a detailed breakdown of the formulation:

Purpose:

• Type of Coating: Glossy two-pack PU clear coat.
• Application: Fast drying, spray application.
• Primary Uses: Wood and furniture coatings.

Components:

Component 1:

• Setalux D A 450 BA/X: Main resin component.
• Butyl acetate: Solvent (14.0% by weight).
• Borchi® Gol LAC 80 (50% in xylene/butyl acetate/methoxy propyl): Wetting agent (0.3% by weight).
• CAB 381-2 (25% in butyl acetate): Cellulose acetate butyrate, used as a film former (12.0% by weight).
• Methyl ethyl ketone (MEK): Solvent (19.7% by weight).

Instructions: Homogenize all ingredients in a dissolver to ensure uniform mixing.

Component 2:

• Desmodur N 75 (75% in xylene/methoxy propyl): Polyisocyanate curing agent (8.0% by weight).

Mixing Ratio:

• Component 1: Component 2 = 100:8 by weight.

Application Properties:

• Solids Content:
  • Component 1: 30% (DIN EN ISO 3251).
  • On application: 30.5%.
• Thinning for Spray Viscosity: Use a mixture of xylene and butyl acetate in a 1:1 ratio (10%).
• Spray Viscosity: Approximately 24 seconds (DIN 53211-cup 4 mm, at 23°C).
• Pot Life: More than 8 hours.
• Drying Time (TG 1): Sand dry in 5 minutes (DIN 53150, at 23°C).
• Hardness: 195 seconds (König method, DIN EN ISO 1522, after 1 week).
• Gloss: Gardner 80 (20° angle) / 86 (60° angle) (DIN 67530 / ISO 2813).
• Haze: 13.
• Chemical Resistance: Resistant according to DIN 68861 part 1B (tested on beech wood veneered).

Suppliers:

• Covestro: Supplier of Desmodur N 75.
• Milliken: Supplier of Borchi® Gol LAC 80.
• Eastman Chemical: Supplier of CAB 381-2.
• Allnex: Supplier of Setalux D A 450 BA/X.

Notes:

• This formulation is provided as a starting point and should be tested and adjusted according to specific needs and conditions.
• The information provided is in good faith but without warranty. Each customer must verify suitability for their own use.
• All sales are subject to standard terms of sale.

This formulation is tailored for professionals in the coatings industry who require a high-performance, glossy finish for wood and furniture applications.