1800-Mesh Heavy Calcium Carbonate: High-Performance Filler for Coatings & Plastics

1800-mesh heavy calcium carbonate – High-performance industrial heavy calcium carbonate is an ultrafine inorganic mineral filler produced through precise processing. Its core component is high-purity calcium carbonate (≥98.5%), with extremely low impurity content.

The content of silica and ferric oxide is controlled to within 0.02% and 0.03%, respectively. Due to its excellent physicochemical properties, it has become a key raw material in the fields of high-performance coatings and plastics, significantly optimizing the hiding power, smoothness, and overall mechanical properties of the final product, thus offering both quality improvement and cost reduction.

The production of this specification requires strict process control, forming a complete closed loop from raw ore selection to finished product packaging. The raw materials are selected from high-purity calcite and marble ore. After crushing and pretreatment, they are processed using high-efficiency ultrafine grinding equipment such as air jet mills, combined with advanced pneumatic classification technology to ensure uniform particle size distribution. The D97 particle size is controlled at 7.0μm, with an average particle size of only 2.0μm.

Whiteness reaches 96.2%, and moisture content is ≤0.3%. Oil absorption value is stable at 27.0 C.C/100g. It is chemically stable, does not decompose below 400℃, is non-toxic and odorless, and fully complies with industrial environmental protection standards. Some products are also modified with nano-level surfactants to improve compatibility and dispersibility with organic substrates.

In the field of high-performance coatings, the ultrafine particle size of 1800-mesh heavy calcium carbonate exhibits unique advantages. In latex paint systems, its particle size is close to that of titanium dioxide (0.2-0.5μm), which can create a synergistic hiding effect, reducing titanium dioxide usage by 10%-20%, while significantly improving dry hiding power and increasing film whiteness by 3-5 units.

Adding this fills the voids within the coating, optimizes application and leveling, avoids brush marks and a grainy texture, improves film smoothness, and increases scrub resistance from 1500 cycles for pure latex paint films to over 3000 cycles. It also enhances water resistance and weather resistance, reducing fading and chalking issues after long-term use.

In powder coatings, the low oil absorption of this grade of heavy calcium carbonate ensures a high gloss of ≥90°, avoiding hazy defects. It is suitable for products with high environmental requirements, such as children's toys and strollers, and complies with EU RoHS standards.

In automotive intermediate and chassis paints, its excellent compatibility with resins fills in substrate scratches, improves topcoat gloss uniformity, and enhances the coating's resistance to stone chips and adhesion strength, resisting sand and gravel impacts and sewage erosion, extending the vehicle's protective lifespan.

In the plastics industry, 1800 mesh heavy calcium carbonate is an ideal reinforcing filler. After surface modification, its affinity with resins such as polyethylene, polypropylene, and PVC is significantly improved, resulting in more uniform dispersion and shorter melting time, thus reducing processing energy consumption.

Its addition can significantly enhance the tensile and compressive strength and flexibility of plastic products, improve surface finish, and reduce raw material costs. It is widely used in products such as plastic pipes, appliance housings, and automotive interior parts.

Compared to ordinary mesh heavy calcium carbonate, the 1800 mesh product, with its finer particle size and more stable performance, is irreplaceable in high-end industrial applications. It not only meets the performance requirements of high-performance products but also helps companies reduce costs and increase efficiency by optimizing processing procedures and reducing the use of expensive raw materials.

With the upgrading of green manufacturing and high-end demands, the application boundaries of this grade of heavy calcium carbonate in environmentally friendly coatings, modified plastics, and other fields will continue to expand, becoming an important support for the upgrading of industrial materials.

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