Water Milling Heavy and Active Ultrafine Nanometer Calcium Carbonate 4000 Mesh - Nanometer-Scale Active Calcium Carbonate for Coatings

Select high-quality calcite, adopt vertical mill, 5000L large stirring mill imported from Germany, hot gas flow mill, modifier and other equipment, and then dry grinding, wet grinding, drying, dispersing and modifying to ultra-fine and nano-sized calcium carbonate.

Product whiteness: 94%- 95%- 96%

Calcium carbonate content:≥98%

Application field:mainly used in high-grade coatings, high-grade paints, inks, PVC, PE, PPR water supply and large sewage pipes, plastic steel profiles, polymer masterbatch, non-woven masterbatch, soft cable masterbatch, silicon copper adhesive, and breathable film.

Product Features

Nano-scale particle size and high dispersibility

The product achieves D97 ≤ 3.2 μm (some high-end products can reach 100–300 nm) through a water-grinding process, and the particle size distribution is extremely narrow and uniform.

Nano-scale particles give it a high specific surface area (20–50 m²/g), which can form a close interface with the coating resin, significantly improving the mechanical properties and stability of the coating. 

In addition, after special surface activation treatment (such as stearic acid, silane coupling agent or polymer grafting), the particle surface is lipophilic and hydrophobic, and can be quickly dispersed in both aqueous and solvent-based systems to avoid agglomeration.

Ultra-high purity and optical properties

Calcium carbonate content ≥ 98.5%, impurities (such as Fe, Mn) are strictly controlled below 0.01%, and whiteness ≥ 96%.

The high whiteness makes it an ideal substitute for titanium dioxide (TiO₂), which can partially or completely replace TiO₂, while maintaining the hiding power of the coating and reducing costs.

Nano-scale particles can also prevent pigment sedimentation through steric hindrance effects and improve the storage stability of coatings.

Controllable morphology and functional adaptation

The water mill process can accurately control the particle morphology to be spherical or cubic, optimizing the rheology and filling efficiency of the coating. 

Spherical particles enhance fluidity and are suitable for high-gloss coatings; cubic particles improve coating density and are suitable for anti-corrosion coatings. In addition, special crystal forms (such as chain or needle) can further enhance the crack resistance and wear resistance of the coating.

Environmental compliance and stability

The product complies with international environmental standards such as REACH and RoHS, has low VOC emissions, and is suitable for environmentally friendly coatings.

Strict quality control ensures stable physical and chemical properties between batches, no agglomeration or yellowing during long-term storage, and meets the consistency requirements of high-end coatings.

Core advantages

Performance improvement

Mechanical enhancement: The strong interface between nanoparticles and resin increases the tensile strength of the coating by 15–30%, and significantly enhances the hardness and impact resistance.

Weather resistance optimization: The dense particle network structure reduces the water absorption of the coating. In the QUV accelerated aging test, the weather resistance is improved by 20–30%, which is suitable for outdoor high-durability coatings.

Optical optimization: Submicron particle size balances hiding power and transparency, and can achieve **high gloss (≥90 GU) or matte (≤10 GU)** effects to meet different coating appearance requirements.

Significant cost reduction

Replacement of titanium dioxide: By optimizing the formula, 10–30% of TiO₂ can be replaced, reducing raw material costs by 8–15%, while maintaining or improving coating performance.

Process efficiency: High dispersibility reduces grinding time and energy consumption, and can increase powder application rate by 10–15% in powder coatings, reducing spraying losses.

Wide range of application scenarios

Industrial and automotive coatings: Enhance the stone chip resistance of primers and the color saturation of metallic paints. Some products can be used for automotive original equipment manufacturers (OEM).

Architectural coatings: Improve the washability (up to more than 10,000 times) and self-cleaning properties of exterior wall latex paints, and extend service life.

Special coatings: After surface functionalization (such as loading silver ions), the coating can be given antibacterial and antistatic properties, which are suitable for medical or electronic fields

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