Are the higher the indicators of ultrafine calcium carbonate, the better?

• Publication time：2025-06-25
• Click：35

What is ultrafine calcium carbonate?

Ultrafine calcium carbonate refers to calcium carbonate powder with a particle size of 0.02 - 0.1μm. It is an inorganic compound that is white, odorless, non - toxic, and has stable chemical properties. Compared with ordinary calcium carbonate, it has characteristics such as small particle size, large specific surface area, high surface activity, and good dispersibility, and has unique advantages in many industries. It is widely used in industries such as plastics, rubber, coatings, inks, and papermaking, and can reduce costs and improve product performance.

Analysis of Key Technical Indicators of Ultrafine Calcium Carbonate

Particle Size: The particle size is a fundamental indicator of ultrafine calcium carbonate. It is necessary to ensure that the average primary particle size reaches 0.02 - 0.1μm. If the particle size does not meet the standard, it is not ultrafine calcium carbonate.

Specific Surface Area: It is closely related to the particle size. The smaller the particle size, the larger the specific surface area. A large specific surface area means high surface activity. If the surface treatment and dispersion technology cannot keep up, the primary particles are likely to agglomerate into large particles during production, affecting the performance. Surface modification treatment can be carried out, using surface treatment agents such as fatty acids and coupling agents to reduce the surface energy, prevent agglomeration, and improve the compatibility with other materials.

Crystal Form Diversity: There are spindle-shaped, cubic, chain-shaped, spherical, etc., which are affected by factors such as reaction conditions and additives. Different crystal forms have differences in appearance and physical properties.

Oil Absorption Value: It has a great impact on the application performance of ultrafine calcium carbonate, especially in the fields of plastics, coatings, and inks. When the oil absorption value is large, more plasticizers are consumed for plastics, increasing the cost and affecting the performance. For coatings and inks, the viscosity increases, the fluidity and coating performance are poor, and the product quality decreases. Therefore, the oil absorption value needs to be moderate.

The particle size, dispersion performance, and specific surface area of the powder can all affect the oil absorption value. Smaller particle size, poor dispersion, and reduction of specific surface area may all lead to changes in the oil absorption value. The oil absorption value can be reduced through surface modification treatment.

Application Case Analysis of Ultrafine Calcium Carbonate

Plastic Industry: Ultrafine calcium carbonate with a particle size of 0.072μm for PVC plastics can improve the surface gloss of products, reduce the whitening phenomenon, and increase the low - temperature elongation rate. In soft cable compounds, increasing the filling amount can still maintain the performance in line with standards, reduce costs, and improve physical properties.

Rubber Industry: Chain - like ultrafine calcium carbonate forms a three - dimensional spatial structure in rubber, enhancing the reinforcement effect. In tire production, it can improve wear resistance, tear resistance, and fatigue resistance. The chain - like shape has the strongest reinforcement performance, followed by the needle - like shape, the spherical shape is relatively weak, and the cubic shape is even weaker. In conveyor belt manufacturing, the chain - like shape has a better effect.

Ink Industry: Cubic ultrafine calcium carbonate is suitable for resin - based inks. It can improve gloss, ensure transparency and fluidity, and meet the needs of high - speed printing.

Paper Industry: Precipitated calcium carbonate for paper coating has requirements for crystal form. Flaky and cubic crystal forms are more ideal, which can improve the smoothness, opacity, whiteness, and flexibility of paper.

Summary

The indicators of ultrafine calcium carbonate are not necessarily better with higher values. It needs to be comprehensively considered according to the usage and industry requirements. Although the particle size is required to be 0.02 - 0.1μm, it is not the smaller the better. If it is too small, it is easy to agglomerate, affecting the appearance and performance of plastic products. The oil absorption value is not the lower the better either. If it is too low, it may not meet the adsorption requirements of some plastic products for plasticizers, affecting the softness and processing performance.