Nano Calcium Carbonates

Nano Calcium Carbonate (nano-PCC) is a synthetically produced precipitated calcium carbonate with a controlled particle size in the nanometre range, typically with a median particle size below 100 nm and a specific surface area of 20 to 40 m²/g. It is produced by the carbonation of calcium hydroxide with carbon dioxide under carefully controlled conditions of temperature, concentration, and agitation, which govern the nucleation and crystal growth of the precipitated particles. The resulting product has a well-defined crystal morphology, typically cubic, rhombohedral, or scalenohedral, and a narrow particle size distribution that distinguishes it from conventional ground or precipitated calcium carbonate.

At the nanoscale, calcium carbonate behaves as a functional additive rather than a passive filler. The very high specific surface area and small particle size create strong interactions with the polymer matrix, enabling nano-PCC to modify the rheological, mechanical, and optical properties of formulated products in ways that are not achievable with conventional micron-scale fillers.

The most commercially important surface treatment for nano-PCC is coating with stearic acid or other fatty acids, which renders the particle surface hydrophobic and improves compatibility with non-polar polymer matrices. The coating prevents particle agglomeration, reduces moisture absorption, and improves dispersion in organic systems, which is critical to achieving the functional benefits of the nano-scale particle size in the finished compound.

Key quality parameters include particle size distribution, coating content by thermogravimetric analysis, and calcium carbonate purity. ROCC Global sources nano-PCC from specialist producers in Asia Pacific and Europe with documented production consistency.

Nano Calcium Carbonate is used as a functional additive in sealants, adhesives, plastics, and coatings where its nanoscale particle size delivers performance benefits beyond those achievable with conventional fillers. In polyurethane and silicone sealants, coated nano-PCC is used as a thixotropic agent and reinforcing filler, providing non-sag consistency in the uncured state and improved tensile strength, elongation at break, and tear resistance in the cured sealant. The thixotropic effect arises from a weak network structure between the nano-PCC particles and the polymer chains, which provides viscosity at rest but breaks down under shear during application. In PVC plastisols used for automotive underbody coatings and sealants, nano-PCC improves impact resistance and contributes to the required rheological profile for spray or extrusion application. In rigid PVC compounds, it acts as a processing aid and impact modifier, improving the impact strength of the finished profile or sheet. In high-performance adhesives, nano-PCC contributes to improved peel strength and fatigue resistance.