The hottest inorganic coatings are developing towa

2022-10-23
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Inorganic coatings are developing in the direction of green, safe and pollution-free

inorganic coatings are developing in the direction of green, safe and pollution-free

September 29, 2020

according to the basic ingredients, coatings can be divided into three categories: organic coatings, inorganic coatings and organic-inorganic composite coatings

organic coatings occupy a dominant position in the market, but with the progress of science and technology, inorganic coatings and organic-inorganic composite coatings began to rise gradually. Inorganic coatings do not use organic polymers as film-forming base materials, but mainly use inorganic compounds such as silicate, silica sol or inorganic phosphonate as main film-forming base materials, and add pigments, fillers, additives and inorganic curing agents that do not exceed 5% of the total amount of coatings. The film-forming mechanism of inorganic coatings is mainly that silicate reacts with water to form colloidal silica and hydrogen and oxygen. With the decrease of water, the solid content increases, and colloidal silica polymerizes into poly silica gel by silica oxygen bond, and finally dehydration and condensation form silica oxygen complex structure

1. Resource advantages and environmental protection advantages of inorganic coatings

most of the base materials of inorganic coatings are made of very common and abundant natural ores or metal oxides, and the production process is not complex, with relatively low energy consumption. Most inorganic coatings use water as the dispersion medium, which fundamentally solves the environmental pollution caused by solvents in the coating industry. The inorganic film-forming base material itself is non-toxic. In addition to water volatilization, it has no VOC hazards such as free monomers, and will not release harmful substances to the atmosphere under flame or high temperature

in recent years, inorganic coatings have been widely used in the fields of internal and external wall architectural decoration, rust prevention, pier protection and high temperature protection, and a variety of functional inorganic coatings have been developed accordingly. For example, high temperature resistant inorganic coating is to add some temperature resistant materials to the coating, such as low melting point glass powder, aluminum powder, pearlescent powder and other substances. The melting point of low melting point glass is relatively low. Under low heating conditions, it can melt and then form enamel, so as to achieve the "secondary film formation" of silicone coating in the high-temperature stage, from simple low-temperature resin film formation to high-temperature short glass powder, so as to form an inorganic high-temperature resistant coating

aluminum powder has flake and spherical shapes. Because of its flake microstructure, it can form an alloy layer under high temperature conditions. The alloy layer can greatly improve the bonding ability between the coating and the substrate, so as to improve the adhesion and mechanical properties, and improve the temperature resistance of the coating, so that the inorganic coating has excellent temperature resistance and weather resistance. Inorganic corrosion-resistant coating is to add graphene oxide, alcohol soluble alkyl silicate esters, silicates and other substances to the inorganic coating to prevent the corrosion of metal materials. After the oxidation and stripping of graphene powder, oxygen-containing functional groups are introduced into graphene monolithic to improve the dispersion of graphene in the matrix, while retaining the layered structure of graphite, making the coating barrier, The relevant specifications of electronic universal testing machine improve the ability of the coating to prevent corrosion ions from penetrating into the corrosive substrate

2. Application of inorganic coatings in buildings

inorganic coatings have good applications in many famous buildings, including China's Beijing Sub Center, Shanghai's Olympic Garden, Hong Kong's new airport and subway, the White House of the United States, Buckingham Palace of the United Kingdom, the Royal Palace of Arabia, Weiss church and Siemens headquarters in Germany, and the presidential palace in Singapore

inorganic coatings have many advantages, but there are also problems such as insufficient decorative effect, weak adhesion and high production cost of some inorganic coatings. In addition, at present, there is no good reference standard for domestic inorganic coatings, and the existing standards can not well reflect the characteristics of inorganic coatings. It is suggested to screen inorganic coatings with good performance by testing the organic content, washing resistance, water vapor transmission and other related experimental tests

therefore, it is suggested that coating manufacturers and scientific research institutions should expand the research work related to the performance development and application construction of inorganic coatings, and further conform to the direction of green, safe and pollution-free development of coatings

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