One of the most prominent properties of organic silicone resin is its excellent thermo-oxidative stability. After heating at 250℃ for 24 hours, weightlessness of organic silicone is only 2%~8%, polycarbonate is 55.5%, polystyrene is 65.6%, epoxy resin is 22.7%; heating at 350℃ for 24 hours, weightlessness of organic resins for 70%~99%, while weight loss is of organic silicone resin is less than 20%.
Another outstanding performance of organic silicone resin is excellent electrical insulating properties, it maintains good insulating properties in a wide temperature and frequency range. Generally, breakdown strength of organic silicone resin is 50kVΠmm, volume resistance rate for 1013~1015 ω • cm, dielectric constant is 3 and dielectric loss angle tangent value is around 10-3.
The outstanding weathering resistance makes it strongly resistant to yellowing even under exposure to ultraviolet light, which is impossible to any other kind of organic resins.
This resin is mainly used as insulating varnishes (including varnishes, enamels, paints, varnish, etc) impregnation class h motor and transformer coil. Organic silicone insulating varnish bond with Mica can produce massive MICA insulating materials and used as insulation for high-voltage motor. Besides, silicone resin can also be used as heat-resistant, weather-resistant coating, metallic protective coating, building waterproof coatings, release agents, adhesives and secondary processing silicone plastic for electronic, electrical and defense industry. It also as a semiconductor packaging materials and insulation materials for electronics, electrical components, and so on.
Curing Crosslinking of silicon resin roughly has three ways:
1 Using hydroxy of silicon atomic for shrinking polymerization-Crosslinking to make joint and into mesh structure. This is the main way of silicon resin curing.
2 Use the vinyl attached to the silicon atoms, and organic peroxide is used as a catalyst, this is similar to vulcanization of silicone rubber
3 Use the vinyl and hydrogen connected to silicon atom to have addition reactions, such as solvent-free silicone resin mixed with foaming agent can produce foamed silicone resin.
Therefore, silicone resin according to its main uses and cross-linking methods can be broadly divided into organic silicone insulating paint, organic silicon coating, organic organic silicon plastic and organic silicone adhesives and other categories. OKCHEM has various organic silicone resins, and visit https://www.okchem.com to get more news!