In architectural coating formulation, dispersants are the foundation of storage stability, color development, and final film performance. Selecting the correct ionic type and chemical structure is critical to meeting specific performance targets.

1. Product Portfolio & Global Benchmarks

Ruike Chemical provides a range of dispersants designed to match industry standards, ensuring seamless integration and reliable performance.

2. Application Logic for Sodium Salt Dispersants (5040 / RD-9605 / RD-9615)

Sodium salt dispersants are the most widely used in water-based architectural coatings due to their high charge density and rapid viscosity-reduction efficiency.

A. General Purpose Sodium Salts (5040 / RD-9605)

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  Mechanism: These operate via strong electrostatic repulsion to keep pigment particles stable and prevent flocculation.

  
  

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  Technical Advantages: They are highly efficient at reducing the viscosity of high-concentration pigment slurries (e.g., calcium carbonate or kaolin).RD-9605, as a high-performance sodium salt, provides exceptional stability and broader compatibility across various systems.

  
  

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  Best For: Interior flat paints, primers, and putties where cost-performance and production efficiency are the priorities.

  
  

B. Premium Hydrophobic Modified Sodium Salt (RD-9615 / 731A)

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  Technical Difference: Unlike simple homopolymers, RD-9615 is a hydrophobic modified copolymer.It provides both electrostatic repulsion and steric stabilization.

  
  

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  Problem Solving: It effectively resolves "rub-up" (color difference) and "flooding" issues during tinting, ensuring tight pigment packing for superior opacity and gloss.

  
  

3. The Unique Value of Ammonium Salt Dispersants (5027)

Ammonium salts are utilized when specific physical properties of the dried film are required that sodium salts cannot provide:

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  Water Resistance: As the film dries, ammonia evaporates, reducing the number of hydrophilic groups remaining in the film, which significantly improves early water resistance.

  
  

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  Best For: Exterior coatings, silk/semi-gloss paints, and systems requiring high weatherability and scrub resistance.

  
  

4. Formulation Synergy with Ruike Thickeners

To achieve optimal rheological results, we recommend the following dispersant-thickener pairings:

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  High-Efficiency Strategy: Combine RD-9605 or 5040 with HASE thickeners like RT-3633 / 3636.The excellent stability of sodium salts ensures the system maintains a stable viscosity at pH 8–9.

  
  

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  High-Performance Strategy: Pair RD-9615 with HEUR thickeners like RT-3625.This combination utilizes the steric stabilization of the modified dispersant and the associative network of the polyurethane to create high-end coatings with superior leveling and fullness.

  
  

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  Spray & High-Build Strategy: Use RD-9605 to ensure viscosity stability under high shear, combined with thixotropic thickeners to prevent sagging on vertical surfaces.

  
  

Ruike Chemical (www.rk-chem.com) is dedicated to providing balanced additive solutions. Whether your goal is cost optimization or performance enhancement, we provide technical support and samples tailored to your specific formulation .