Silicone resin


1 principle
Silicone silicone is a highly crosslinked network of polyorganosiloxanes, usually methyltrichlorosilane, dimethyldichlorosilane, phenyltrichlorosilane, diphenyldichlorosilane or methyl Various mixtures of phenyldichlorosilane are hydrolyzed at a lower temperature in the presence of an organic solvent such as toluene to obtain an acidic hydrolyzate. The initial product of hydrolysis is a mixture of cyclic, linear and crosslinked polymers, usually also containing a significant amount of hydroxyl groups. The hydrolyzate is washed with water to remove the acid, and the neutral condensate is thermally oxidized in the air or further polycondensed in the presence of a catalyst to finally form a highly crosslinked stereo network structure.


2 types
Silicone resin can be roughly classified into silicone insulating varnish, silicone coating, silicone plastic and silicone adhesive according to its main use and crosslinking method.


3 performance
Silicone is a thermoset plastic and one of its most outstanding properties is its excellent thermal oxidative stability. After heating at 250 ° C for 24 hours, the silicone weight loss is only 2 to 8%. Another outstanding property of silicone is its excellent electrical insulation properties, which maintain its good insulation properties over a wide temperature and frequency range.


4 uses
Silicone resin is mainly used as insulating varnish (including varnish, enamel, color lacquer, impregnating varnish, etc.) to impregnate H-class motor and transformer coil, and used to impregnate glass cloth, glass cloth and asbestos cloth to make motor casing and electrical insulation. Windings, 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, silicone can also be used as a heat-resistant, weather-resistant anti-corrosion coating, metal protective coating, construction waterproof and moisture-proof coating, mold release agent, adhesive and secondary processing into silicone plastic for electronic, electrical and defense industries. In addition, it is used as an insulating material for semiconductor packaging materials and electronic and electrical components.