The basic structural unit of organic silica gel is composed of silicon oxygen chain, and the side chain is connected with other organic groups through silicon atom. Therefore, the structure of organosilicon products contains both "organic groups" and "inorganic structures". This special composition and molecular structure make it combine the characteristics of organic substances and the functions of inorganic substances. Compared with other polymer materials, the most outstanding properties of silica gel products are as follows:
Silica gel products are based on silicon oxygen (Si-O) bond as the main chain structure. The bond energy of C-C bond is 82.6 kcal / g, and the bond energy of Si-O bond is 121 kcal / g in silicone. Therefore, the thermal stability of silicone is high, and the chemical bond of molecule is constantly cracked and does not decompose under high temperature (or radiation irradiation). Silicone rubber products can not only withstand high temperature, but also low temperature, and can be used in a wide temperature range. Both the chemical properties and the physical and mechanical properties change little with the temperature.
The main chain of silica gel is – Si-O – without double bond, so it is not easy to be decomposed by ultraviolet light and ozone. It has better thermal stability, radiation resistance and weather resistance than other polymer materials. Therefore, the service life of many silica gel parts and silica gel electronic accessories in natural environment can reach several decades.
Electrical insulation performance
Silica gel products have good electrical insulation properties, and their dielectric loss, voltage resistance, arc resistance, corona resistance, volume resistance coefficient and surface resistance coefficient are among the best in insulating materials, and their electrical properties are little affected by temperature and frequency. Therefore, they are a kind of stable electrical insulation materials, which are widely used in electronic and electrical industry. In addition to excellent heat resistance, silicone also has excellent water repellency, which is the guarantee of high reliability of electrical equipment in wet condition.
Low surface tension and low surface energy
The main chain of silicone rubber products is very flexible, and the intermolecular force is much weaker than that of hydrocarbons. Therefore, the viscosity, surface tension, surface energy and film forming ability of silicone rubber products are lower than those of hydrocarbons with the same molecular weight. This low surface tension and low surface energy are the main reasons for its application in many ways: hydrophobic, defoaming, foam stabilization, anti sticking, lubrication, polishing and other excellent properties.
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