Molecular sieves refer to a class of substances with uniform micropores and the pore size is equivalent to the general molecular size. Commonly used molecular sieves are crystalline silicates or aluminosilicates, which are connected by oxygen bridges to form pores and cavities of molecular size (usually 0.3~2 nm). . In addition, phosphoaluminate molecular sieves have been discovered, and the framework elements (such as silicon, aluminum, and phosphorus) of molecular sieves can also be replaced by other elements (heteroelements, such as iron, boron, copper, manganese, etc.).
It is estimated that the total installed capacity of solar thermal power generation in the world will reach 42GW in 2020 and 200GW in 2030. According to the construction cost of US$2500 per kilowatt, the industry can reach 3.2 trillion yuan! According to the data of the Ministry of Housing and Urban-Rural Development of China, the per capita housing in the city is 30 square meters and the rural area is 33.6 square meters, the total housing is about 45 billion square meters.
Everyone knows that silica sol is not toxic. It is not listed as a hazardous chemical, but its additives may be included. The chemical formula of silica sol is mSiO2·nH2O, and its composition is amorphous silica particles, water and Small amounts of stabilizers (such as Na+, K+, NH4+) workshop staff should wear protective clothing, protective glasses and other safety facilities to protect the skin during production. If you accidentally touch the skin, just wash it off with water.
Nano particles are used in coatings to obtain coatings with anti-radiation, aging resistance and high peel strength or with some special functions, called nano composite coatings. According to the fineness of the coating, nanocomposite coatings can be subdivided into nano-modified coatings and nano-structured coatings.