5 Key Surface Modification Techniques for High-Quality Calcium Carbonate Powder Production

5 Key Surface Modification Techniques for High-Quality Calcium Carbonate Powder Production

Calcium carbonate powder is a versatile material widely used in industries such as plastics, paints, coatings, and pharmaceuticals. To enhance its performance, surface modification is often required. Here are five essential techniques to achieve high-quality modified calcium carbonate powder:

1. Stearic Acid Coating

Stearic acid is one of the most common surface modifiers for calcium carbonate. It improves dispersibility and compatibility with organic matrices. The process involves heating the powder and stearic acid to melt the modifier, followed by thorough mixing.

Stearic acid coating process for calcium carbonate

2. Silane Coupling Agents

Silane coupling agents create chemical bonds between calcium carbonate and polymer matrices. This method significantly enhances mechanical properties in composite materials. Different silanes can be selected based on the target application.

3. Titanate Coupling Agents

Titanate coupling agents offer excellent performance in improving the interface between inorganic fillers and organic polymers. They’re particularly effective in high-filler-load systems, reducing viscosity and improving processing characteristics.

4. Polymer Coating

Polymer coating involves encapsulating calcium carbonate particles with polymers like polyethylene or polyacrylate. This method provides excellent compatibility with specific polymer matrices and can impart additional functionalities.

Polymer coating of calcium carbonate particles

5. Plasma Treatment

Plasma surface modification is a dry, environmentally friendly process that can introduce various functional groups onto the calcium carbonate surface without changing bulk properties. It’s particularly suitable for heat-sensitive applications.

Recommended Equipment: MW Ultrafine Grinding Mill

For producing high-quality calcium carbonate powder prior to surface modification, we recommend our MW Ultrafine Grinding Mill. With input size of 0-20 mm and capacity of 0.5-25 tph, this mill features:

  • Higher yielding with 40% more capacity than jet mills
  • Adjustable fineness between 325-2500 meshes
  • Eco-friendly operation with pulse dust collector
  • Digitalized processing for high precision

MW Ultrafine Grinding Mill for calcium carbonate production

For applications requiring even finer powder, our LUM Ultrafine Vertical Grinding Mill (input size: 0-10 mm, capacity: 5-18 tph) offers advanced powder separating technology and energy-saving features.

Conclusion

Surface modification is crucial for unlocking the full potential of calcium carbonate powder. By combining proper modification techniques with high-quality grinding equipment like our MW Ultrafine Grinding Mill, manufacturers can produce superior products for diverse industrial applications.