Calcium carbonate is a widely used inorganic salt mineral. Calcium carbonate is a 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. Since its sedimentation volume (2.4-2.8 mL/g) is larger than the sedimentation volume of heavy calcium carbonate produced by mechanical methods (1.1-1.9 mL/g), it is called light calcium carbonate. Heavy Calcium Carbonate, also known as Ground Calcium Carbonate (GCC American called Kotamite), is produced by mechanically pulverizing natural calcite, limestone, chalk, shells, and the like. Since 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 modifying on the basis of ordinary calcium carbonate, thereby achieving the dual purpose of filling and modifying in the composite product. These modifications include modifications to the crystal morphology, particle size, particle size distribution, and surface properties of the calcium carbonate. To improve its overall performance. It can also improve the hardness, modulus of elasticity, dimensional stability and thermal stability of the product while reducing costs. Speaking of nanometer calcium carbonate, the first thing to understand is nanomaterials? Nano is simply a unit of length, which is 10 minus 9 square meters. The nanomaterial refers to a general term for zero-dimensional, one-dimensional, two-dimensional, three-dimensional materials having small size effects 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 properties of light, electricity, magnetism, heat, mechanics, and machinery, nanotechnology rapidly penetrates into various fields of materials and has become a hot spot in current world scientific research. The English name for nanotechnology is nano-tech. According to physical form, nanomaterials can be roughly divided into five categories: nano powder, nano fiber, nano film, nano block and nano phase separation liquid. Although the nanomaterials currently being industrially produced are mainly nano-powder materials such as calcium carbonate, white carbon black and zinc oxide, others are basically in the primary research stage of the laboratory, and large-scale applications are expected to be 5-10 years later, but There is no doubt that nanotechnology represented by nanomaterials will 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 nanostructured materials such as nanoceramics and nanocomposites; design and synthesis of nano-coating materials; single-electron transistors, nanolasers and nanometers Development of nanoelectronic devices such as switches, C60 ultra-high density information storage materials, etc. Nano-calcium carbonate is a new inorganic salt product prepared by non-metallic ore limestone as raw material by using nano-powder technology by precipitation method. Its particle size is 10-100nm. Because of its small particle size and good activity, it is a new type of inorganic material. With many special functions, it is mainly used in plastics, rubber, paper, paint, ink, food, medicine and other industries. For example, it is added to rubber, and its vulcanization rate, tearing property, compression deformation and flexural flexibility are more than added. Generally calcium carbonate is high. At present, only a few companies in China produce nanometer calcium carbonate, and the output is very small, which cannot meet the market demand. The characteristics of calcium strontium carbonate can be artificially controlled color, particle size, surface characteristics, dispersion, rheology, thixotropy and crystal form, etc., and 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 rate, low hardness, low abrasion value, non-toxicity, odorlessness, odorlessness and good dispersibility. 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, paint, paint, ink, cable, pharmaceutical, fertilizer, feed, food, sugar, textile. , glass, ceramics, sanitary products, sealants, adhesives, pesticides and pesticide carriers, as well as environmental protection aspects such as flue gas desulfurization and water treatment. The use of light calcium carbonate is different from that of heavy calcium carbonate. It is mainly used in paper, plastic, artificial rubber, food, food color, medicine, adhesive and sanitary products. In recent years, its use has increased because of the information that light calcium carbonate can enhance the performance of certain materials. The application of calcium carbonate in the paper industry uses calcium carbonate in the paper industry, which can make the paper have good brightness, firm structure, good writing, uniform coating, low friction, easy to drain and easy to dry. Since the world paper industry has successfully switched from an acidic process to an alkaline process since the early 1980s, the use of fillers has revolutionized: calcium carbonate replaces wood pulp and other pigments to improve the brightness of paper. Permeability, porosity, bulk density, etc. Base processing is mainly used to produce fine printing and writing paper. For important papers such as newsprint, although it is produced in an acid-based environment, calcium carbonate can also be used. At present, the amount of calcium carbonate used in paper coating formulations has increased significantly, from 5% to 10% to about 30%. The world's transition from acid to alkaline process reached its climax in the mid-1990s. In terms of paper production capacity, in 1997 the US alkaline or neutral papermaking process accounted for 80% of the total paper production capacity, and Western Europe accounted for 65%; In addition to a small amount of special paper products, 95% of the production capacity in the United States has been alkaline or neutral, and in Europe it has reached 80%. This turn gave a huge market for calcium carbonate. At present, the paper-making grade calcium carbonate produced in China cannot meet the demand, and the gap still needs to be imported. Calcium Carbonate in Plastic Polymers Calcium carbonate is a very important filler, especially in Europe, accounting for 60% of the market for mineral fillers and reinforcing agents by weight. The main uses of calcium carbonate fillers are plasticized PVC (cable, floor artificial leather, etc., heavy calcium accounted for 10% to 30%), and hard PVC (rigid PVC doors and windows, profiles, plates, pipes, sheets accounted for 5%~ 20%, 40% to 80% of floor tiles), unsaturated polyester materials (sheet molding and integral molding in the automotive, appliance and appliance industries), polypropylene (Furniture, automotive, packaging, fiber, etc.) and poly Ethylene. Heavy calcium is added to the plastic as a filler, which not only increases the capacity, increases the cost, but also makes the fabric uniform. It also improves the processing properties, wear resistance, tensile strength, impact strength, flexural strength, elongation at break and The thermal properties of the product, etc., in addition, the addition of heavy calcium can improve the stability of plastic products. It is reported that heavy calcium is currently widely used in polyvinyl chloride, polyethylene, polypropylene and various unsaturated resins, among which PVC products are the earliest and largest market for calcium carbonate, for example, in soft polyethylene wire, polyvinyl chloride. Polyvinyl chloride tile and calcium plastic materials account for 20% to 50%, accounting for 10% to 30% of polyethylene and polypropylene packaging materials, and 20% to 60% of automotive parts and ceilings. The application of calcium carbonate in the production of paints and coatings is another important use of calcium carbonate. Calcium carbonate is an important filler in the production of paints. The fineness and particle distribution determine the transparency of the paint. In addition, calcium carbonate has good weather resistance, and has important characteristics such as abrasion resistance, low electrolyte content, pH stabilization effect, corrosion resistance and rheology of the coating. Calcium carbonate is also very important in the water-based coating series, which can improve the quick-drying performance and is of great significance in road marking. In addition, the use of calcium carbonate in paint can reduce the amount of titanium dioxide, which is economically advantageous. This will further stimulate the increase in the amount of calcium carbonate used in paints and coatings. Calcium carbonate in rubber, plastics, paint, paper, cable, paint and other industries 1. Calcium carbonate in rubber application Calcium acid is one of the earliest large-scale fillers used in the rubber industry, calcium carbonate is heavily filled in rubber Among them, the volume of the product can be increased, thereby saving the cost of expensive natural rubber to achieve cost reduction. The calcium carbonate filled rubber can obtain higher tensile strength, tear strength and natural strength than pure rubber sulfide. There is a significant reinforcement in rubber and synthetic rubber, and the consistency can be adjusted. 2. Application of calcium carbonate in plastics Calcium carbonate can play a skeleton role in plastic products, which has a great effect on the dimensional stability of plastic products, can improve the hardness of products, and can also improve the surface gloss and surface of products. Flatness. The addition of calcium carbonate to general plastic products can improve the heat resistance. Since the whiteness of calcium carbonate is above 95%, it can also replace the expensive white pigment to play a certain whitening effect. 3. The amount of calcium carbonate used in the paint industry is larger. The amount of calcium carbonate used in the paint industry is large, and it is an indispensable skeleton. The dosage in the thick paint is more than 30%, and the phenolic enamel 4-7% phenolic fine pattern wrinkles. More than 39% of paint. 4. Calcium carbonate plays an important role in the paper industry to ensure the strength, whiteness and low cost of paper. 5. Can play a certain insulation role in the cable industry. 6. The application in the waterborne coating industry is more widely used in the waterborne coating industry. It can make the coatings not settle, easy to disperse, and has good gloss. The amount of waterborne coatings is 20-60%. In the coating industry, ultra-fine calcium can not only be used as a whitening body pigment, but also increases the capacity, reduces the gloss of the paint, improves the gloss, dryness and hiding power of the paint, and also has a reinforcing effect. The replacement of the more expensive titanium dioxide with ultra-fine calcium can achieve the same effect. Ultrafine calcium with a particle size of less than 80 nm is used in automotive chassis anti-stone coatings and topcoats due to its good thixotropy. In recent years, with the extensive and deep application of heavy calcium carbonate in the fields of plastics, rubber, paper, medicine, food, building materials, chemicals, coatings, feed, etc., high-quality industrial heavy calcium carbonate raw materials have broad development and application prospects.  First of all, the application of heavy calcium carbonate is becoming more and more extensive. It has been used in many fields such as plastics, silicone, paper, building materials and paints that consume light calcium carbonate. With the breakthrough of application technology and cost reduction requirements, it is used in large quantities. Cheap, heavy calcium carbonate that performs the same function. The plastics industry refers to heavy calcium carbonate as the king of fillers, accounting for more than half of all fillers. With the development of plastic modification technology in China, the trend of plastic-based steel and plastic-based wood is becoming more and more obvious. Heavy calcium carbonate plays a leading role in plastic fillers. In the paper industry, more and more factories are Acidic papermaking is converted to alkaline papermaking. At present, chemical wood pulp mills in Europe use neutral papermaking. The key technologies and products developed in China's paper industry are neutral sizing and coated paper, while UNESCO advocates the popularization of low-quantity, low-gloss coated paper for primary and secondary school students. High-grade offset printing paper, which is widely used in the printing industry, is gradually developing in the direction of high-filling and low-quantity coated paper. Therefore, ultra-fine 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 is used as a filler for rubber products to improve the processing properties of products and improve the mechanical properties of products, such as increasing the tearing or tearing strength and flexing resistance. The effect of initial strength or semi-reinforcement. Unlike carbon black, calcium carbonate is an indispensable filler for transparent and light colored rubber. With the continuous improvement of the application level of the rubber industry, ultra-fine heavy calcium carbonate will be able to partially replace carbon black, which has a bright future.é‡ In the coatings industry, heavy calcium carbonate is the first filler in the world's coatings. As the production of waterborne coatings increases, the amount of heavy calcium carbonate will increase further in the future. It enters the coatings industry in addition to weight gain, mainly used to partially replace titanium dioxide (maximum substitution of 30%, typically 10 to 20%) and color pigments, also used to replace light calcium and precipitated barium sulfate, For these applications, it is necessary to use finely refined and ultra-fine fine calcium carbonate. 7. Nano-active calcium carbonate has ultra-fine and ultra-pure characteristics in the rubber industry. The crystal form and particle size are effectively controlled during the production process, and the surface modification is carried out. Therefore, it has a spatial three-dimensional structure in rubber and has good dispersibility, which can enhance the reinforcing effect of the material. Such as chain-like nano-sized ultra-fine calcium carbonate, in the rubber mixing, the chain-like chain is broken, a large number of high-activity surfaces or high-activity points are formed, and they form a bond with the long rubber chain, which is not only dispersible, And greatly enhanced the reinforcement. It is worth noting that it can be used not only as a reinforcing filler, but also in combination with other fillers according to production requirements, such as carbon black, white carbon black, light calcium heavy calcium, titanium white powder, clay, etc. Strong, filling, coloring, improving the processing technology and improving the performance of the product, reducing the gelatinization rate or partially replacing the expensive white filler such as white carbon black and titanium white powder. It can be used as a pigment filler in the coating industry. It has the advantages of fineness, uniformity, high whiteness and good optical properties. Nano-sized ultra-fine calcium carbonate has a steric effect. In the paint, it can make a high density of formula. The powder is suspended and acts as a sedimentation prevention. After the paint is painted, the whiteness of the paint film is increased, the gloss is high, and the hiding power is not lowered. This property has been widely promoted and applied in the paint industry. It has high gloss, low wear rate, surface modification and oleophobicity in the plastics industry. It can be filled with polymers such as polyvinyl chloride, polypropylene and phenolic plastics, and is now widely used in PVC cable packing. As a filler in the ink industry, it can replace the higher price of colloidal calcium and improve the gloss and brightness of the ink. It can be used in the paper industry to coat raw materials for processed paper, especially for advanced copper paper. Because of its good dispersing performance and low viscosity, it can effectively improve the whiteness and opacity of the paper, improve the smoothness and softness of the paper, improve the absorption performance of the ink, and improve the retention rate. Heavy Calcium Carbonate This product is refined with high quality and high grade calcite. It has high CaCO3 content, less impurities, high whiteness and low oil absorption. It is 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 moisture and moisture, and the outside of the bag to avoid pollution. Light calcium carbonate This product meets or exceeds the HG/T2226-2000 industry standard. The product quality is stable, with high purity, ultra-light, white and so on, and the heavy metal content is extremely small, far below the national standard, it is an environmentally friendly material. , deeply favored by users. It is mainly used in the production, processing and application of rubber, type materials, building materials, paints, paints, papers, medicines, food, feed, daily chemicals, inks, etc., mainly as product fillers to increase product volume and reduce production costs. Packing specification: 25Kg/bag, compound woven bag packaging, the product requires moisture and moisture, and the outside of the bag to avoid pollution. Active Calcium Carbonate This product mainly uses surface modifiers, and can also add other treatment agents according to user requirements. It is characterized by high whiteness, good lipophilicity, easy dispersion in organic polymers, effective improvement of processing performance and reduction. Its production costs. Packing specification: 25Kg/bag, compound woven bag packaging, the product requires moisture and moisture, and the outside of the bag to avoid pollution.
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