Calcium carbonate is a widely used inorganic salt mineral. Calcium carbonate is the natural mineral of the Earth's outer shell. Calcium carbonate is divided into light calcium carbonate (PCC) and heavy calcium carbonate (GCC). With the continuous development of science and technology, active calcium carbonate and nano calcium carbonate have been developed. Light Calcium Carbonate, also known as Precipitated Calcium Carbonate (PCC), is produced by chemical processing. Because its settling volume (2.4-2.8 mL/g) is greater than mechanically produced ground calcium carbonate sediment (1.1-1.9 mL/g), it is referred to as light calcium carbonate. Heavy Calcium Carbonate, also known as Ground Calcium Carbonate (GCC USA, called Kotamite), is made by mechanically crushing natural calcite, limestone, chalk, and shells. Because its sedimentation volume (1.1-1.9 mL/g/g) is smaller than the chemically produced light calcium carbonate sedimentation volume (2.4-2.8 mL/g), it is called heavy calcium carbonate. Activated calcium carbonate is obtained by modification on the basis of ordinary calcium carbonate, thereby achieving the dual purpose of filling and modification in composite products. These modifications include modification of the crystalline morphology, particle size, particle size distribution, and surface properties of the calcium carbonate. To improve its overall performance. It can reduce the cost, but also improve the product's hardness, elastic modulus, dimensional stability and thermal stability. Speaking of nano-calcium carbonate, the first thing to understand is nano-materials. Nano is simply a unit of length, which is a negative 9th power of 10 meters. Nanomaterials are collectively referred to as zero-dimensional, one-dimensional, two-dimensional, and three-dimensional materials having a small size effect composed of ultrafine particles having a size of less than 100 nm (0.1-100 nm). The concept of nanomaterials was formed in the mid-1980s. Because nanomaterials exhibit specific optical, electrical, magnetic, thermal, mechanical, and mechanical properties, nanotechnology has rapidly penetrated into various fields of materials and has become a hot topic in the world of scientific research. The English name of nanotechnology is nano-tech. According to the physical form, nanomaterials can be divided into five categories: nanopowders, nanofibers, nanofilms, nanoblocks, and nanophase-separated liquids. Although the current industrialized production of nano-materials is mainly calcium carbonate, silica, zinc oxide and other nano-powder materials, other basically still in the primary research stage of the laboratory, large-scale application is expected to take 5-10 years, but There is no doubt that nanotechnology represented by nanomaterials will certainly have a profound impact on the economic and social development of the 21st century. Current research hotspots and technological frontiers include: nano-assembled materials represented by carbon nanotubes; high-performance nano-structured materials such as nano-ceramics and nano-composites; design and synthesis of nano-coating materials; single-electron transistors, nano lasers, and nanometers Development of nano-electronic devices such as switches, C60 ultra-high density information storage materials, etc. Nano-calcium carbonate is a new inorganic salt product made from non-metallic ore limestone using the precipitation method to synthesize nano-powder. Its particle size is 10-100nm. It is a new inorganic material because of its small particle size and good activity. Has many special functions, mainly applicable to plastics, rubber, paper, coatings, inks, foods, pharmaceuticals and other industries. If added to rubber, its vulcanizate elongation rate, tearing performance, compression deformation, and flex resistance are better than adding General calcium carbonate is high. At present, only a few companies in China produce nano-calcium carbonate and the output is very small, which cannot meet market demand. The characteristics of calcium carbonate can artificially regulate color, particle size, surface properties, dispersion, rheology, thixotropy and crystal shape, etc. Moreover, calcium carbonate has high chemical purity, strong chemical inertness, and good thermal stability, below 400 degrees Celsius. Will not break down. In addition, calcium carbonate also has the advantages of low oil absorption, low hardness, small wear value, non-toxic, odorless, odorless, and good dispersion. Due to the above special properties, the application of calcium carbonate has developed rapidly. It has been widely used in industrial and agricultural fields such as rubber, plastics, paper, coatings, paints, inks, cables, pharmaceuticals, fertilizers, feed, food, sugar, textiles. , glass, ceramics, sanitary products, sealants, adhesives, pesticides and pesticide carriers, and flue removal sulfur, water treatment and other environmental aspects. The use of light calcium carbonate overlaps with that of heavy calcium carbonate, and is mainly used in the fields of papermaking, plastics, artificial rubber, food, edible colorants, medicines, adhesives, and hygienic products. In recent years, the use of lighter calcium carbonate has increased the use of certain materials because of the fact that it can enhance the performance of certain materials. Application of Calcium Carbonate in Paper Industry Calcium carbonate is used in the paper industry to provide good brightness, solid structure, good writing, uniform coating, low friction, easy moisture removal, and easy drying. Since the world's paper industry has successfully switched from acidic to alkaline processes since the early 1980s, the use of fillers has undergone a revolutionary change: the use of calcium carbonate instead of wood pulp and other pigments can improve the brightness of paper, not Transparency, porosity, bulk density, etc. Base processing is mainly used to produce fine prints and writing papers. For papers such as newsprint, some important papers, although produced using an acid-based environment, calcium carbonate can also be used. At present, the use of calcium carbonate in papermaking coating formulations has increased substantially and has increased from 5% to 10% to around 30%. The world's papermaking process from acidic to alkaline process reached its climax in the mid-1990s. In terms of papermaking production capacity, the American alkaline or neutral papermaking process accounted for 80% of the total papermaking capacity in 1997, and Western Europe accounted for 65%; by 2000 In addition to a few special paper products in the United States, 95% of production capacity has been alkaline or neutral, and Europe has reached 80%. This shift gives a huge market for calcium carbonate. At present, China's production of paper coating grade calcium carbonate can not meet the demand, the gap still needs to make up for imports. Calcium carbonate in plastic polymers Calcium carbonate is a very important filler, particularly in Europe, which accounts for 60% of the mineral filler and fortifier market by weight. The main uses of calcium carbonate fillers are plasticized PVC (cables, floor artificial leather, etc., heavy calcium accounts for 10% to 30%,), and rigid PVC (5% PVC in rigid windows, profiles, plates, tubes, and sheets). 20%, 40% to 80% in floor tiles, unsaturated polyester materials (sheet molding and integral molding for the automotive, appliance and appliance industries), polypropylene (furniture, automotive, packaging, fiber, etc.) and poly Ethylene. The use of heavy calcium as a filler in plastics not only increases the capacity, increases the volume, lowers the cost, makes the fabric evenly, but also improves the processability, abrasion resistance, tensile strength, impact strength, bending strength, elongation at break and Product thermal properties, etc. In addition, the addition of heavy calcium can improve the stability of plastic products. According to reports, heavy calcium is widely used in polyvinyl chloride, polyethylene, polypropylene, and various unsaturated resins. Among them, PVC products are the earliest and largest market for calcium carbonate, for example, in soft polyethylene wires and polyvinyl chloride. , PVC tiles, calcium plastic materials, accounting for 20% to 50%, in polyethylene, polypropylene packaging materials accounted for 10% to 30%, in auto parts, ceilings accounted for 20% to 60%. Application of calcium carbonate in the production of paints and coatings Production of paints is another important use of calcium carbonate. Calcium carbonate is an important filler in paint production. Fineness and particle distribution determine the transparency of the paint. In addition, calcium carbonate has good weather resistance, and has important characteristics such as wear resistance, low electrolyte content, pH stabilizing effect, and improved corrosion resistance and rheology of the coating. Calcium carbonate is also very important in the water-based paints series, it can improve the quick-drying performance, and has important significance in highway marking. In addition, the use of calcium carbonate in paint can reduce the amount of titanium dioxide used, which is economically advantageous. This will surely further stimulate the use of calcium carbonate in paints and coatings. Applications of Calcium Carbonate in Rubber, Plastics, Paints, Paper, Cables, Coatings, etc. 1. Application of Calcium Carbonate in Rubber Calcium is one of the largest fillers used in the rubber industry. Calcium carbonate is largely filled in rubber. Among them, the volume of the product can be increased, thereby saving expensive natural rubber for the purpose of reducing costs. Calcium carbonate filled rubber can obtain higher tensile strength, tear strength, and tear resistance than pure rubber sulphide and in natural Rubber and synthetic rubber have a significant reinforcing effect, while the consistency can be adjusted. 2. Application of Calcium Carbonate in Plastics Calcium carbonate can play a skeleton role in plastic products. It plays a significant role in the dimensional stability of plastic products. It can improve the hardness of products and can improve the surface gloss and surface of products. Smoothness. The addition of calcium carbonate in general plastic products can improve heat resistance. Since the whiteness of calcium carbonate is above 95%, it can also replace the expensive white pigments to achieve a certain degree of whitening effect. 3. The amount of calcium carbonate in the paint industry is larger The amount of calcium carbonate used in the paint industry is relatively large, and it is an indispensable skeleton. The amount used in the thick paint is more than 30%, and the phenolic enamel 4-7% in the phenolic fine pattern wrinkles More than 39% paint. 4. Calcium carbonate plays an important role in the paper industry to ensure paper strength, whiteness, and low cost. 5. In the cable industry can play a certain degree of insulation. 6. Application in water-based coating industry The application in water-based coating industry is more widely used, it can make the coating not settle, easy to disperse, good gloss and so on. The amount of water-based coating is 20-60%. In the coating industry, ultrafine calcium can not only be used as a whitening constitution pigment, but also increase the capacity and reduce the cost, increase the gloss of the paint, improve the glossiness, dryness and hiding power of the paint, and also have a reinforcing effect. Substituting ultra-fine calcium for the more expensive titanium dioxide completely achieves the same effect. Ultrafine calcium with a particle size of less than 80 nm is used in automobile chassis anti-fouling paints and topcoats due to its good thixotropy. In recent years, with the extensive and in-depth application of heavy calcium carbonate in plastics, rubber, paper, medicine, food, building materials, chemicals, coatings, feed, etc., the quality of heavy calcium carbonate raw materials for industrial use has broad prospects for development and application. ? First of all, the application of heavy calcium carbonate is becoming more and more widespread. In the fields of plastics, tannins, papermaking, building materials, paints, etc., where a large amount of light calcium carbonate was consumed, a large number of applications were made in accordance with breakthroughs in application technology and cost reduction requirements. A cheap, heavy calcium carbonate that can perform the same function. The plastics industry refers to heavy calcium carbonate as the king of fillers and accounts for more than half of all fillers. With the development of China's plastics modification technology, the tendency is to use plastic-replaced steel and plastic-to-generation wood, and heavy calcium carbonate occupies the top position in the filling of plastic products. In the paper industry, more and more factories are Acid papermaking is converted to alkaline papermaking. At present, European chemical pulp mills use neutral papermaking. The technologies and products that China's papermaking industry has focused on are neutral sizing and coated papers, and UNESCO's initiative to popularize low-level, low-gloss coated papers for schoolchildren. The advanced offset printing papers used in the printing industry are gradually developing towards high-fill paper and low-quantity coated papers. Therefore, ultrafine calcium carbonate products will become extremely important inorganic fillers and coatings in the paper industry in the future. In the rubber industry, activated calcium carbonate is called “Bai Yanhua†and it is used as a filler for rubber products. It can improve the processing performance of products and improve the mechanical properties of products, such as improving the tearing or tearing strength, and flexing resistance. Strong or semi-strong effect. Unlike carbon black, calcium carbonate is an indispensable filler for transparent and light-colored rubber. With the continuous improvement of the level of application of the rubber industry, ultra-fine heavy calcium carbonate will partially replace carbon black, and has a bright future. In the coatings industry, heavy calcium carbonate is the world's first filler. With the increase in the production of waterborne coatings, the use of heavy calcium carbonate will increase further in the future. It is used in addition to weight gain in the coatings industry. It is mainly used to partially replace titanium dioxide (maximum substitution of 30%, usually 10 to 20%) and color pigments. It is also used to replace light calcium and precipitated barium sulphate. In these applications, it is necessary to use micronized and superfine heavy calcium carbonate. 7. The nano-active calcium carbonate has ultra-fine and ultra-pure characteristics in the rubber industry. The crystal shape and particle size are effectively controlled during the production process, and the surface modification is performed. Therefore, it has spatial three-dimensional structure in rubber and good dispersion, which can enhance the reinforcing effect of the material. Such as chain-like nano-scale calcium carbonate, in the rubber compounding, the chain-like chain is broken, will form a large number of high-activity surface or high activity point, they form a bond with the long rubber chain, not only good dispersion, And greatly enhanced the reinforcing effect. It is worth noting that it can be used not only as a reinforcing filler alone, but also in accordance with production needs and other fillers, such as: carbon black, white carbon, light calcium heavy calcium, titanium dioxide, clay, etc., to fill Strength, filling, color, improve the processing technology and improve product performance, reduce the rubber content or partial replacement of white carbon black, titanium dioxide and other expensive white filler purposes. The paint industry can be used as a pigment filler, with fine, uniform, high whiteness, good optical properties, nano-scale ultrafine calcium carbonate has a steric hindrance effect, in the paint, can make the formula density higher Lide Powder suspension, anti-settling effect. After the paint, the whiteness of the paint film increases, the gloss is high, and the hiding power does not drop. This feature makes it widely used in the paint industry. The plastic industry has high gloss, low wear rate, surface modification and oleophobicity, and can be filled with polymers such as polyvinyl chloride, polypropylene and phenolic plastics, and is now widely used in PVC cable fillings. In the ink industry as a filler, it can replace the higher price of colloidal calcium, and can increase the gloss and brightness of the ink. In the paper industry can be used to coat the raw materials of processed paper, especially for advanced copperplate paper. Because of its good dispersing performance and low viscosity, it can effectively improve the whiteness and opacity of paper, improve the smoothness and softness of paper, improve the ink absorption performance, and improve the retention rate. Heavy calcium carbonate This product is refined with high-quality, high-grade calcite, with high CaCO3 content, less impurities, high whiteness, low oil absorption, etc., mainly used in plastics, rubber, paint, coatings, building materials, glass, textile and other industries . Packing specification: 25Kg/bag, compound woven bag packaging, the product requires moistureproof and moisture proof, outside the bag to avoid contamination. This product meets or exceeds the HG/T2226-2000 industry standard in light calcium carbonate products. The product quality is stable, with high purity, ultra-light, white and other characteristics, and the content of heavy metals is extremely small, far lower than the national standard, is an environmentally friendly material , favored by users. It is mainly used in the production, processing and application of rubber, molding materials, building materials, paint, paint, paper, medicine, food, feed, daily chemical products, and inks. It is mainly used as a product filler to increase product volume and reduce production costs. Packing specification: 25Kg/bag, compound woven bag packaging, the product requires moistureproof and moisture proof, outside the bag to avoid contamination. Activated Calcium Carbonate This product is mainly used for surface modifiers. It can also add other treatment agents according to user needs. It is characterized by high whiteness, good lipophilicity, easy dispersion in organic polymers, effectively improving its processing performance and reducing Its production cost. Packing specification: 25Kg/bag, compound woven bag packaging, the product requires moistureproof and moisture proof, outside the bag to avoid contamination.