Heavy Active Calcium Carbonate 325 Mesh - High Purity Calcium Carbonate for Paint and Coatings

Features:

High chemical purity, not easy to chemical reaction, good thermal stability, stable color, low oil absorption value, high whiteness, uniform particle size distribution, non-toxic, odorless, odorless, good dispersion and other characteristics.

Product Characteristics

Particle Size and Morphology

The 325 mesh particle size of this calcium carbonate means that the average particle diameter is relatively coarse compared to finer meshes. The particles often have irregular shapes, which can affect their packing and dispersion in paint and coating formulations. However, their relatively large size can also contribute to certain properties such as increased thickness and opacity in the final product.

High Purity
With a high calcium carbonate content, typically over 95%, the product has low levels of impurities like iron, magnesium, and other trace elements. This high purity ensures that it has minimal impact on the color, stability, and chemical properties of paints and coatings. For example, low iron content helps prevent discoloration and maintains the whiteness and colorfastness of the final coating.

Surface Activity
The surface of the calcium carbonate particles is activated, usually through treatment with stearic acid or other surface modifiers. This activation improves the compatibility of the calcium carbonate with the resin matrix in paints and coatings. It enhances the dispersion of the filler, reduces the viscosity of the paint or coating, and promotes better adhesion between the particles and the binder.

Functions in Paint and Coatings

Filling and Reinforcing

As a filler, heavy active calcium carbonate can significantly increase the volume of paint and coating formulations. It fills the spaces between the resin molecules, improving the mechanical properties of the coating. For example, it can enhance the hardness, abrasion resistance, and tensile strength of the coating, making it more durable and suitable for applications where wear and tear are common, such as industrial coatings and floor paints.
Improving Optical Properties

The high whiteness of the calcium carbonate (usually over 90%) can enhance the hiding power and whiteness of the paint or coating. It helps to cover the substrate effectively, reducing the need for large amounts of expensive pigments. In addition, the particle size and shape can affect the light scattering properties, contributing to a more uniform and aesthetically pleasing surface finish.

Adjusting Viscosity and Thixotropy

The surface activation of the calcium carbonate can adjust the viscosity and thixotropic behavior of the paint or coating. By controlling the amount of filler and its interaction with the resin, it can make the formulation more suitable for different application methods, such as spraying, brushing, or rolling. For example, it can prevent sagging during application and ensure a smooth and even coating film.

Product Advantages

Cost-Effective

Heavy active calcium carbonate is relatively inexpensive compared to some other fillers and pigments used in paints and coatings. Its ability to partially replace more expensive materials reduces the overall cost of the formulation without sacrificing significant performance, making it an attractive option for manufacturers looking to optimize their production costs.

Wide Availability

It is widely available in the market, which ensures a stable supply for paint and coating manufacturers. The large production scale and easy access to raw materials contribute to its consistent quality and affordability.
Compatibility

The surface activation of the calcium carbonate makes it highly compatible with various types of resins and binders commonly used in paint and coating formulations. This compatibility allows for easy incorporation into different product lines, whether they are solvent-based, water-based, or powder coatings.

Application:plastic, rubber, paper, paint, paint, cable, building materials and other industries.

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