Light Calcium Carbonate Surface Modification: Methods & Benefits & Evaluation
Learn how surface modification improves light calcium carbonate for better dispersion and strength in industrial materials.
Activated Calcium Carbonate(ACC)
What Is Activated Calcium Carbonate? Activated Calcium Carbonate is produced by surface coating the Precipitated Calcium Carbonate slurry with Fatty Acids (Stearic Acid) and Titnate Coupling Agent then filtering and drying of the coated PCC slurry to produce ACC powder. Unlike untreated calcium carbonate, ACC reduces interfacial tension, enhances mechanical properties, and enables higher filler loading—making it a game-changer for cost-sensitive, high-performance applications. Key Features: Surface Treatment: Stearic acid (1–3%), titanate, or silane coatings. Enhanced Compatibility: Optimal bonding with plastics, rubber, and resins. Purity: ≥98% CaCO₃, heavy metals <10 ppm (ICP-MS verified). How Is Activated Calcium Carbonate Produced? 1. Dry Surface Modification Steps: Pre-Drying: Heat CaCO₃ to 100–120°C to remove moisture. Coating: Spray stearic acid (1–2% by weight) in high-speed mixers. Curing: Heat to 80°C for 30 minutes to ensure uniform coverage. Advantages: Low energy consumption (≤15 kWh/ton). Oil absorption reduced to 20–25 g/100g (vs. 35–40g for untreated CaCO₃). 2. Wet Surface Modification Steps: Slurry Preparation: Mix CaCO₃ with water (30–40% solids). Reactor Treatment: Add titanate coupling agent (0.5–1%) under pH control. Filtration & Drying: Centrifuge and spray-dry to free-flowing powder. Advantages: Higher coating uniformity (≥95% coverage). Ideal for nano CaCO₃ activation (50–100nm). Technical Specifications of Activated Calcium Carbonate Parameter Specifications Testing Method Particle Size (D50) 1–10 μm (adjustable) Laser Diffraction Activation Degree ≥90% TGA Weight Loss Analysis Oil Absorption ≤25 g/100g ISO 787-5 Moisture Content ≤0.3% Oven Drying (105°C) pH Value 8.0–9.5 pH Meter (10% suspension) Custom Options: Coating agents (stearate, titanate, silane). Particle size (0.5–15 μm), packaging (25kg bags, bulk silos). Why Choose Activated Calcium Carbonate? Core Advantages Superior Polymer Compatibility Plastics: Enables 50–70% filler loading in PVC pipes, reducing costs by 20–30% while maintaining impact strength (ASTM D256). Rubber: 40% replacement of carbon black in tires, improving tear resistance by 15% (ASTM D624). Process Efficiency Reduces mixing time by 25% in polymer compounding (Brabender torque…
