How to Master Dispersion in High-Fill Systems

I. Dispersion Challenges in High-Fill Systems: More Than Just "Viscosity Reduction"

High filling means an extremely high concentration of pigment and filler particles in the system. The distance between particles is shortened, and interaction forces (such as van der Waals forces) are enhanced, easily forming a flocculated network structure. This leads to high thixotropy and poor fluidity of the grind. This not only increases grinding energy consumption and time but can also affect the final film's gloss, hiding power, and durability. Therefore, an ideal dispersant needs to possess strong de-flocculation capabilities, effectively breaking up these agglomerates and releasing the trapped solvent, thereby achieving significant viscosity reduction.

II. Anjeka Solutions: Targeted Dispersion Strategies

Facing different resin systems and filler types, Anjeka offers a series of proven dispersant choices, aiming to provide customized solutions for high-fill grinds:

• For General High-Filler Viscosity Reduction: Products like Anjeka-6500-50 and Anjeka-6402 strike a balance between economy and effectiveness. They can effectively reduce the viscosity of high-filler systems and provide good anti-settling properties, especially suitable for scenarios such as epoxy floor mid-coats, primers, and wood coating primers.
  
• For Strong Viscosity Reduction Demands: Products like Anjeka-6910 and Anjeka-6111 demonstrate stronger viscosity reduction capabilities in systems with ultra-high filler content or extremely strict fluidity requirements, helping to improve grind fluidity and reduce application marks.
  
• For Optimizing Inorganic Pigments (e.g., Titanium Dioxide): Products like Anjeka-6111A are particularly effective in stabilizing inorganic pigments, especially titanium dioxide. They can greatly reduce grind viscosity and increase gloss while reducing haze.
• For Preparing Stable Universal Colorants: For preparing high-concentration universal colorants containing both organic and inorganic pigments, products like Anjeka-6881 and Anjeka-6622, used in combination with Anjeka-6402, can help achieve excellent storage stability and broad resin compatibility, with outstanding performance in rub-out, flooding, and floating during tinting.

III. Synergistic Anti-Settling for Long-Term Stability

Dispersion is the foundation; stability is the guarantee. The settling problems faced by high-fill grinds during storage cannot be ignored. Rheology modifiers like Anjeka Anjeka-4410 (modified polyurea type) can be used synergistically with dispersants. By post-addition, it can form an effective thixotropic network, suspending pigment particles and preventing hard settlement, with minimal impact on system leveling and gloss. It is an ideal choice for achieving both good can stability and application performance.

IV. Practical Recommendations: From Lab to Production

Add Additives First: To ensure sufficient wetting, it is recommended to add the dispersant to the grinding vehicle first, then add the pigments and fillers.

Optimize Dosage: Start within the recommended dosage range and find the optimal addition point through stepwise experiments to balance cost and performance.

Verify Stability: Assess long-term stability by testing grind viscosity, fineness, and color changes through heat storage tests (e.g., 50°C/7 days or 40°C/30 days).