How to Add Pigment Dispersants: A Technical Guide by Chemi Tech

In coatings and ink production, the uniformity of pigment dispersion directly affects product color, stability, and performance. Many manufacturers face issues such as pigment agglomeration, color shift, or storage separation, leading to reduced product quality and increased costs. To address these challenges, scientific addition of dispersants is critical. 

Chemi Tech offers the following solution based on technical expertise:

1. Pre-treatment Evaluation: Select dispersant types compatible with pigments (e.g., organic, inorganic, carbon black) and resin systems.

2. Addition Sequence Optimization: Add dispersants to the grinding base first, mix thoroughly, then gradually incorporate pigments to avoid direct powder contact.

3. Dosage Control: Recommended dosage is 0.2%-5% of pigment weight, with optimal ratio determined through small-scale tests. Overuse may cause flocculation or affect film properties.

4. Process Adaptation: For high-speed dispersion or sand milling, add dispersants before grinding; adjust timing for three-roll milling processes.

Case Example: A coating manufacturer producing blue alkyd paint experienced low color strength and storage instability. With guidance from Chemi Tech’s team, the dispersant dosage was adjusted to 1.5% of pigment weight and pre-mixed into the resin before grinding. The resulting paste achieved a fineness below 15μm, 30% improved color uniformity, and enhanced storage stability.

Proper dispersant addition reduces energy consumption and waste. Chemi Tech provides eco-friendly dispersants and technical support to help manufacturers achieve high-quality production.