Difference between the silicone rubber and the silicone resinby Jessica Chen stone home
Silicone rubber, can divided into heat curing type (high temperature vulcanized silicone HTV) and RTV which divided RTV condensation reaction and addition reaction type. Silicone rubber has excellent heat resistance, cold resistance, dielectric resistance, ozone resistance and weathering resistance and other properties, the outstanding performance of the silicone rubber is a wide use temperature at -60 ℃ (or lower temperature) to +250℃ (or higher temperature) for long-term use.
But tensile strength and tear strength and other mechanical properties of the silicone rubber is poor, and at room temperature and its physical and mechanical properties is poorer than the majority of synthetic rubber, and in addition silicon nitrite, fluorosilicate rubber, generally silicon rubber oil, solvent resistance is poor, silicone rubber is not suitable for ordinary conditions occasions.
Silicone resin is Polyorganosiloxane which has a highly cross-linked structure, both dual characteristics of the organic resin and inorganic materials, silicon resin with unique physical and chemical properties. Silicon resin adhesive silicone adhesive according to the raw material source can be divided into silicon resin materials for the adhesive and with silicone rubber materials for the adhesive. The former mainly for bonding a metal and a heat-resistant silicone resin, good bonding properties of iron, aluminum, and tin, metals, glass and ceramics but also easy-glued, but the poor adhesion of the copper.
The silicone coatings also have a number of drawbacks: poor film-forming properties, including high curing temperature, long time, and inconvenient for the construction of a large area, and the coating adhesion to the underlying. Fluorination is to increase the solvent resistance of the silicone resin, oil repellency (anti-adhesive), and reducing the surface energy. The silicone resin has a critical surface tension lower than that of other resins, but higher than the fluorine resin.
Silicone resin as insulating paint (including varnishes, enamels, paints, impregnating varnish, etc.) impregnated with Class H motor and transformer coils, and used to impregnate glass cloth, motor casing made of glass wiring and asbestos cloth, electrical insulation windings. With silicone insulating paint bonded mica large area the mica sheet insulation materials, used as the main insulation of high-voltage motors. In addition, silicone resin can also be used as a heat-resistant, weather-resistant anti-corrosion coatings, protective metal coatings, construction waterproof moisture-proof coatings, mold release agents, adhesives, and secondary processing of silicone plastic, and used in electronic, electrical and defense industry, as the semiconductor package materials and electronic and electrical silicon. According to their main purpose and the way of cross-linked, Resin can be divided into silicone insulating paint, silicone coatings, silicone, plastic and silicone adhesives can be divided into several categories.
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Created on Dec 31st 1969 18:00. Viewed 0 times.