Nanometer calcium carbonate science -1

Nanometer calcium carbonate refers to calcium carbonate powder with at least one dimensional particle size control between 1~100nm calcium carbonate molecular polymer, the particle size is in the transition region of cluster molecules and macroscopic objects, a single nanometer calcium carbonate primary particle (also known as a primary particle) can not be observed with the naked eye or even with ordinary optical microscopy. A high-resolution electron microscope is needed to see its structure and shape clearly. Nanometer calcium carbonate has quantum size effect, small size effect, surface effect and macroscopic quantum tunnel effect, and has different or abnormal physical and chemical properties from ordinary light calcium carbonate in magnetism, catalysis, photothermal resistance and melting point, such as special properties of toughness, reinforcement, transparency, thixotropy, leveling and disinfection and other applications. With the deepening of the research on the application of nano-calcium carbonate, it has gradually been pulled away from its mysterious veil, which has greatly stimulated the research and development interest of scientific and technological personnel at home and abroad.
Nano-calcium carbonate as a new high-grade inorganic functional material, compared with ordinary calcium carbonate products, it has the characteristics of fine particles, large specific surface area, high surface activation rate, high whiteness, in many application fields can play a strengthening and toughening role, so as to improve the usability and appearance of products. It can partially replace expensive raw materials such as white carbon black, so that the cost of products is reduced and the quality is greatly improved. Therefore, the appearance of nano-calcium carbonate, the realization of a wide range of applicability and strong market demand, in coatings, plastics, rubber, adhesives, paper, ink, paint, cosmetics and medicine and food and other fields have a wide range of uses. At present, the price of one ton is more than 10,000 yuan, which is the nanometer industry with the scale of 10,000 tons and the highest level of industrialization. Its toughening and strengthening effect has greatly improved and enhanced the performance and quality of products in related industries, and the performance of its nano effect and characteristics in the production process and application process has been concerned by the majority of nano calcium carbonate production enterprises and users.
According to the current situation of the domestic plastic industry and the use of nano-calcium carbonate in recent years, some industry experts have recently suggested that the plastic industry should focus on the following areas when using nano-calcium carbonate: degradation of agricultural film, nano-modified automotive plastic parts and special resins.
The annual consumption of agricultural plastic film in China is more than 450,000 tons, which brings the unavoidable land pollution problem. Therefore, the promotion and use of degradable agricultural film is very high, but the current price of fully biodegradable agricultural film is too high, it is still difficult to promote the application. The use of nano-calcium carbonate to modify agricultural film can solve the contradiction between cost, performance and price. Although inorganic nano-calcium carbonate filler and ordinary calcium powder filler, can not play a direct degradation of agricultural film, but because of the unique properties of nano-calcium carbonate, it can be evenly filled in a large proportion of agricultural film, so that the product in the molding and implementation of secondary stretching, the surface and internal formation of countless tiny gaps, help and accelerate the degradation of light/biological additives on agricultural film, The produced agricultural film can not only ensure the quality and performance, but also do not increase the production cost, but also achieve rapid degradation.
The lightweight of nano-modified automotive plastic parts is the key to saving energy and reducing consumption. Relevant data show that for every 10% reduction in vehicle mass, fuel consumption can be reduced by 6% to 8%. In order to reduce the weight of cars, the use of high-performance plastic parts to replace heavy metal parts has become the mainstream of development. Ordinary plastic products have low modulus and heat resistance and poor impact strength, so it is difficult to be directly used in auto parts. However, if a certain proportion of nano-calcium carbonate and other additives are added to the plastic resin, the resin is modified, and the heat resistance, aging resistance and impact strength of the product can be significantly enhanced. This will be the fastest growing domestic demand for nano-calcium carbonate in the future, and the most potential for development. For example, the PP modified by adding nano-calcium carbonate used in cars can increase its heat resistance from 80 ° C to 150 ° C, and can ensure that it does not age and crack for 750 to 1000 hours at high temperatures.
Nano-modified special resin, at present, China's special plastic resin varieties are few, low grade, difficult to meet market demand. However, if special additives and nano-calcium carbonate emulsion are added in the synthesis process of plastic resin, high-performance special plastic resin which is in short supply in the domestic market can be prepared. For example, Taiyuan Chemical Co., Ltd. and Hangzhou Warner Company cooperation, the development of nano-calcium carbonate microemulsion, has been successfully used in Taihua chlor-alkali branch PVC equipment, the production of PVC resin by domestic and foreign plastic processing enterprises sought after, the product has been in short supply.