A kind of highly active adsorbent material, usually made by reacting sodium silicate and sulfuric acid, and through a series of post-treatment processes such as aging and acid soaking. Silicic acid is an amorphous substance with the chemical formula mSiO2, nH2O. it is not allowed to be used in water and any solvent.
It is non-toxic and tasteless, chemically stable, and does not react with any substance except strong alkali and hydrofluoric acid. Various types of silica gel form different microporous structures due to their different manufacturing methods. The chemical organization and physical structure of silica gel determines that it has many characteristics that are difficult to replace with other similar materials: strong adsorption performance, good thermal stability, stable chemical properties/higher mechanical strength, etc.
Section 4 Conductive Agent and Mechanism of Conductive Agent 115~18)
Conductive coating is a new type of functional coating that has developed rapidly in recent years. It imparts conductivity to objects, has the functions of antistatic, conductive, and shielding electromagnetic waves. Conductive coatings are widely used in aviation technology, modern electronics industry and construction industry. The aircraft radome is treated with conductive paint, which can ensure the release of deposited static electricity, so that the performance of radio navigation and communication equipment can be brought into full play. The white conductive paint developed by the United States in the 1980s is used to protect aircraft. The coating can reflect most of the human radiation energy of visible light and infrared wavelengths in the thermal flash environment, and can also play the role of releasing static charge channels, ensuring that the aircraft radar is good in the normal flight environment and the harmful thermal flash environment To work. In the modern electronics industry, a large number of conductive materials are used in the preparation of television picture tubes, radio machinery, electromagnetic shielding devices, electrode terminal leads, tape recorder tuning devices, television antennas, the outer surface of cathode ray tubes, and the preparation of radio reflectors for waveguides.
Paint, In my country, in recent years, with the rapid growth of various electronic equipment, problems such as electromagnetic environmental pollution, electromagnetic spectrum crowding, and serious electromagnetic interference have also appeared. Most of the plastic casings used in equipment have almost no shielding properties against electromagnetic waves, and the application of conductive coatings in the electromagnetic shielding of casings continues to increase. In addition, with the development of economy and the improvement ptfe powder quality of people’s living standards, the decorative requirements of conductive coatings are getting higher and higher. Light-colored conductive and antistatic coatings with excellent condensation properties and high decorative properties have also been paid more and more attention.
Conductive coatings can be divided into two categories: bulk type and blended type. Bulk conductive paint is a polymer compound used as a film-forming matrix, which itself has a conductive group, so that an organic semiconductor with a volume resistivity (pv) of 10’~101Q.cm can be obtained, including a polymer electrolyte.
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