Common knowledge of coating: popular knowledge of heavy calcium carbonate

Core tip: in recent years, the rapid development of China's real estate industry has driven the continuous progress of the coating industry, and also driven the demand for raw materials for coating, among which calcium carbonate is also a necessary raw material for coating The reserves of calcium carbonate in China refer to the reserves of calcite, dolomite, marble, limestone, white marble and other ores The estimated proved and discovered reserves are about 150 billion tons, mainly distributed in coastal provinces (Guangxi, Guangdong, Zhejiang, Shandong, Yunnan); inland provinces (Jiangxi, Hubei, Anhui); central provinces (Henan, Hebei); western provinces (Sichuan) Northeast China Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Home of coatings news: in recent years, the rapid development of China's real estate industry has driven the continuous progress of the coating industry, and also driven the demand for raw materials for coating, calcium carbonate as a necessary raw material for coating is also among them The reserves of calcium carbonate in China refer to calcite, dolomite, marble and limestone The reserves of ores, such as white marble, are estimated to be 150 billion tons The main distribution areas are: coastal provinces (Guangxi, Guangdong, Zhejiang, Shandong, Yunnan); inland provinces (Jiangxi, Hubei, Anhui); central provinces (Henan, Hebei); western provinces (Sichuan); Northeast Provinces; northwest provinces (Shanxi, Inner Mongolia, Xinjiang) The total output of calcium carbonate in China was 3.368 million tons in 2002, 7.5 million tons in 2007, 10 million tons in 2010, and 14 million tons in the first half of 2013, with an average annual growth rate of about 10% The production methods of heavy calcium carbonate in China are usually divided into dry process and wet process The characteristics of dry production are low investment and mass production of products with stable quality; flexible control of production conditions according to different use requirements, production of products with different requirements at a lower cost; surface modification of products to improve the performance of products Wet process production is to crush and wash the extracted natural calcium carbonate ore once and twice, select it and then enter wet process grinding equipment, mix it with dispersant and then grind it twice, and get the product after quick drying and collection Its production features are: large-scale production, low cost; product quality parameters can be adjusted according to the product requirements; it can reach extremely fine particle size There are obvious differences in physical properties between the dry and wet methods due to the differences in production process In terms of fineness, the particle size of 90% of wet ultrafine bicalcium particles can reach 2 um, while that of dry process is less than or equal to 2 um in the best case In the aspect of particle size distribution, the particle size distribution of wet superfine heavy calcium is narrow, generally concentrated below 1.5um, the particle size distribution curve shows a single peak shape, while the particle size distribution curve of dry superfine heavy calcium is a double peak shape, with a wide particle size distribution Most of them are distributed in the range of 1.0-10um In the aspect of powder morphology, wet superfine heavy calcium is spherical or nearly spherical, while dry process heavy calcium is mostly amorphous, and particle horns are fuzzy There are five aspects in the application of heavy calcium in coatings: first, as a physical pigment, it has filling effect, fine, uniform and high whiteness Second, it has a certain covering power, generally using ultra-fine products, because the filler has a coordinating effect on the covering power of titanium dioxide, when its particle size is close to that of titanium dioxide, it has a better covering effect Third, it can improve the strength and water resistance of the paint film Fourth, improve color retention Fifth, reduce costs Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,