Silicone Resin Properties & Uses
China's organic silicon industry has developed since the early 1950s, and has made great progress in material properties, mechanisms and applications. Silicone resin and modified silicone resin products are widely used in national defense industry, electrical industry, leather industry, light industrial products, rubber and plastics, food hygiene and other industries for their excellent thermal oxidation stability, electrical insulation properties, weather resistance, water resistance, salt spray resistance, mold resistance and biocompatibility, playing an irreplaceable role. The application prospects in the high-tech industry and cutting-edge fields are very broad.
Silicone resin properties
(1) One of the most outstanding properties of silicone resins is excellent thermal oxidation stability. After being heating at 250 ° C for 24 hours, the weight loss of silicone is only 2% to 8%, polycarbonate is 55.5%, polystyrene is 65.6%, epoxy resin is 22.7%; After being heating at 350 ° C for 24 hours, the weight loss of the general organic resin is 70% to 99%, and the weight loss of the silicone resin is less than 20% .
(2) Another outstanding property of silicone resin is its excellent electrical insulation properties, which allows the resin to maintain good insulation properties over a wide temperature and frequency range. Generally, the silicone resin has an electric breakdown strength of 50 kV mm, a volume resistivity of 1013 to 1015 Ψ·cm, a dielectric constant of 3, and a dielectric loss tangent of about 10 to 3.
(3) The silicone resin also has outstanding weather resistance, and it is resistant to yellowing even under intense ultraviolet light irradiation, which is unmatched by any organic resin.
(4) In addition, the silicone resin is also resistant to water, salt spray, mold and the like.
In view of the above characteristics, silicone resin is mainly used as an insulating varnish (including varnish, enamel, paint, impregnating varnish, etc.) to impregnate H-class motor and transformer coil, and is used to impregnate glass-fibre fabric, glass cloth and asbestos cloth to make motor casing, electrical insulation winding, etc. Bonding mica with silicone insulating varnish can produce a large area of mica sheet insulation material, which is used as the main insulation of high voltage motors. In addition, the silicone resin can be used as heat-resistant, weather-resistant anti-corrosion coating, metal protective coating, waterproof and moisture-proof coating for construction engineering, release agent, adhesive. Also, the silicone resin can be reprocessed into silicone plastic. Furthermore, it can be used as an insulating material for semiconductor packaging materials, electronic, electrical components in the electronic, electrical, and defense industries. Silicone resins for coatings play a very important role in various industries.