Silicone is made into various adhesive sealants, potting compounds, insulating coatings and silicone grease, which are used in various electronic devices.
It is not only used as a special material for aviation, cutting-edge technology and military technology departments, but also used in various departments of the national economy. Its application scope has been extended to: architecture, electronics and electricity, textiles, automobiles, machinery, leather and paper, chemical industry and light industry, metals and coatings, medicine and medical treatment.
Characteristics of silicone
1, temperature resistance
Silicone products have silicon-oxygen (Si-O) bond as the main chain structure. The bond energy of C-C bond in siloxane is 82.6 kcal/mol, and that of Si-O bond is 65,438+0,265,438+0 kcal/mol. Therefore, silicone products have high thermal stability, and the chemical bonds of molecules will not break or decompose under high temperature (or radiation irradiation). Silica gel is not only resistant to high temperature, but also to low temperature, and can be used in a wide temperature range.
2. Weather resistance
The main chain of silicone products is -Si-O-, and there is no chemical bond, so it is not easily decomposed by ultraviolet rays and ozone. Silicone has better thermal stability, radiation resistance and weather resistance than other polymer materials. The service life of silicone in natural environment can reach several decades.
3, electrical insulation performance
Silicone products have good electrical insulation performance, and their dielectric loss, voltage resistance, arc resistance, corona resistance, volume resistance coefficient and surface resistance coefficient are among the best among insulation materials, and the electrical performance is less affected by temperature and frequency. Therefore, they are a stable electrical insulating material.