What are the classifications of ultrafine modified calcium carbonate?
What classification does ultra-fine modified calcium carbonate fall under?
Ultrafine calcium carbonate refers to calcium carbonate with a primary particle size of 0.02–0.1 μm; it was initially developed and designed in Japan—indeed, it is a type of nanocomposite material. So, what are the classifications of ultrafine modified calcium carbonate?
What are the classifications of ultrafine modified calcium carbonate? 1. Wet-processed ultrafine calcium carbonate: Wet-process modification of ultrafine calcium carbonate is currently one of the fastest-growing product categories. Dolomite from around the world is crushed to a specified particle size, then a small amount of thickening agent and surface modifier is added to the slurry, followed by wet grinding, dewatering, drying, and further crushing, resulting in a powder with more precise particle size distribution, better dispersion, and enhanced surface-modifying activity. This product is used in composite resins such as PVC, PP, PE, and PA, yielding plastic articles with smooth, bright surfaces, while allowing for a 5%–10% increase in dosage. 2. Nanotechnology-based calcium carbonate: Nano-calcium carbonate, as a new type of advanced material, offers advantages such as reinforcement, transparency, excellent dispersibility, compressibility, adhesion, and antibacterial properties. It has become a key raw material driving transformative changes across numerous industries, including information technology, biotechnology, and traditional manufacturing. With an average particle size of less than 100 nm, nano-calcium carbonate exhibits unique characteristics compared with conventional materials in terms of surface properties, magnetism, catalytic activity, light absorption, thermal conductivity, and melting point.
What are the application areas of ultra-fine modified calcium carbonate? 1. Modified calcium carbonate masterbatches for commodity products are now widely used in packaging bags, knitted fabrics, woven textiles, sun-protection nets, round yarns, wire-drawing machines, and non-woven fabrics, typically at dosages of 5% to 20%, with some applications reaching 30% to 40%. These masterbatches enhance the printability and tactile properties of plastic products, reduce shrinkage, improve processing efficiency, and lower production costs, making them an indispensable filler and modifier in these product categories. 2. Plastic films: This type of filled and modified masterbatch is used in agricultural mulch films, liner films, film bags, and other plastic film products. The quality and dosage requirements for such applications are stringent. It is generally recommended to use CaCO3 with a mesh size of 1250 or higher. The finer the particle size distribution, the lower the light transmittance but the better the processing performance; the narrower the particle size distribution, the more stable the product quality. 3. Packaging bags and shopping bags have become everyday items that make daily life more convenient and efficient. In many countries around the world, packaging bags are formulated with a certain amount of calcium carbonate—sometimes as high as 30%—which facilitates the degradation and recycling of plastic packaging materials, thereby attracting widespread attention and appreciation from all sectors. 4. Daily-use products: In recent years, cast films such as disposable tablecloths, pads, rainproof cloths, protective masks, sanitary napkins, packaging films, and other similar products have seen extensive application. These products typically incorporate 20% to 40% of ultra-fine heavy calcium carbonate masterbatch, with some formulations approaching 50%. The heavy calcium carbonate in the masterbatch features small particle size, narrow particle-size distribution, and high environmental safety indices. While further reducing production costs, it must also meet the demands for improved water absorption, superior appearance, and enhanced tactile qualities.
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