White soft touch topcoat - formula

This formulation is for a white soft-touch topcoat suitable for application by brush or roller. It includes various components to ensure smooth application, durability, and a soft-touch finish. The formulation is based on Neocryl* XK-98 acrylic co-polymer emulsion and Deuteron* SO-302 elastomer co-polymer, using non-ionic synthetic associative thickeners (NSAT) for rheology control.

Components and Their Functions:

1. Water
   • Function: Vehicle, dissolving and carrying other components.
2. Ammonium Polyacrylate (Dispex CX 4240)*
   • Function: Dispersing agent, aiding in the even distribution of pigments and fillers.
3. Emulsion of Polysiloxanes (Drew 210-886)*
   • Function: Foam control agent, reducing foam formation during application.
4. Biocide (Nuosept BM11)*
   • Function: In-can preservative, preventing microbial growth and extending shelf life.
5. Propylene Glycol
   • Function: Coalescing agent, aiding in the film formation process by promoting the merging of polymer particles.
6. Alkaline (pHLEX™ 400)
   • Function: pH adjuster, ensuring the pH is in the desired range.
7. Titanium Dioxide (KRONOS 2190)*
   • Function: Pigment, providing opacity and whiteness.
8. Acrylic Co-polymer Emulsion (Neocryl XK-98)*
   • Function: Binder, providing adhesion and forming a durable film upon drying.
9. Elastomer-Copolymerisat in Water (Deuteron SO 302)*
   • Function: Soft-feel additive, giving the coating a soft touch finish.
10. Glycol Ether (Dowanol DPnB)*
    • Function: Coalescing agent, enhancing film formation.
11. NSAT (Aquaflow™ NLS-220E)
    • Function: Rheology modifier, adjusting the viscosity and flow properties.
12. NSAT (Aquaflow™ NHS-350E)
    • Function: Additional rheology modifier, further fine-tuning viscosity and flow properties.

Properties:

• Total Weight: 100%
• Viscosities:
  • Brookfield (Spl6/100RPM): 4460 mPa·s
  • Krebs Stormer: 120 KU
  • Cone & Plate: 270 mPa·s
• Specific Mass: 1.18 Kg/m³
• Gloss (60°): 9 GU
• Leveling:
  • Leneta: 10 (1-10; 10=Best)
  • NYPC: 6 (1-10; 10=Best)
• Sag Resistance: 200 microns
• pH: 8 – 9

Preparation Procedure:

1. Initial Mixing:
   • Add water to a mixing container.
   • Gradually add ammonium polyacrylate and biocide, stirring to ensure proper dispersion.
   • Incorporate the emulsion of polysiloxanes and titanium dioxide, dispersing at high speed until fineness < 10 µm is achieved.
2. Let Down:
   • Gradually add acrylic co-polymer emulsion (Neocryl* XK-98) and elastomer co-polymer (Deuteron* SO 302), mixing to achieve a uniform consistency.
   • Incorporate additional emulsion of polysiloxanes, glycol ether (Dowanol* DPnB), and propylene glycol.
   • Add rheology modifiers (Aquaflow™ NLS-220E and NHS-350E) and water, stirring until homogeneous.