Activated Calcium Carbonate for Plastics
Overview
Active calcium for plastics is a surface-modified calcium carbonate (CaCO3) specifically engineered for polymer applications. Unlike regular calcium carbonate, it undergoes surface treatment with stearic acid or other coupling agents to improve compatibility with plastic matrices. This treatment reduces particle agglomeration and enhances dispersion, making it a cost-effective filler that simultaneously improves mechanical properties. The material is widely used in PVC pipes, profiles, PP compounds, and other plastic products where both performance and economics are critical factors.
Physical and Chemical Properties
The effectiveness of active calcium stems from its optimized physical characteristics. Typical particle sizes range from 1-5 microns, with specific surface areas between 3-10 m²/g. Surface treatment reduces oil absorption to 20-30 g/100g compared to 40-60 g/100g in untreated grades. Chemically, it maintains the stability of calcium carbonate but with altered surface chemistry. The stearate coating creates hydrophobic surfaces that bond better with polymers. This modification increases thermal stability up to 400°C, making it suitable for most plastic processing methods including extrusion and injection molding.
Main Applications
In rigid PVC applications, active calcium improves impact strength by 15-30% while reducing material costs by 10-20%. It's essential in pipe formulations where it enhances dimensional stability and reduces thermal expansion. For polypropylene compounds, it increases stiffness without significant loss of impact resistance. Masterbatch producers utilize its excellent dispersion to create high-loading concentrates (up to 80% calcium content). In rubber products, it improves tensile strength and abrasion resistance while maintaining elasticity.
Safety and Storage
While chemically inert, active calcium powder requires careful handling to prevent dust inhalation. Facilities should employ local exhaust ventilation and workers should use NIOSH-approved N95 respirators during bulk handling. Storage must prevent moisture absorption which can compromise surface treatment effectiveness. Bulk bags should be stored on pallets in warehouses with <60% relative humidity. Treated grades have a typical shelf life of 12 months when properly stored away from acidic environments that could degrade the carbonate base.
B2B Procurement Guide
Procurement professionals should specify five key parameters: surface treatment type (stearate, titanate, or silane), median particle size (D50), moisture content (<0.5% preferred), free alkali content (<0.1%), and specific gravity. For large-volume purchases, request certified test reports for sieve analysis, loss on ignition, and pH value. Consider regional suppliers for cost efficiency - China produces 80% of global capacity, with major manufacturers offering both standard and custom-treated grades. Sample testing in actual production formulations is strongly recommended before full-scale adoption.
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