Silicone rubber is mainly produced by alkali-catalyzed polymerization and acid-catalyzed polymerization in industry. KOH and temporary catalyst [(CH3)4NOH, (n-C4H9)4POH] are often used. ?
The processing and molding method is shown in the figure. The purpose of primary vulcanization is to carry out crosslinking reaction of polymer chains; The purpose of secondary vulcanization is to carry out supplementary crosslinking, drive away decomposition products of vulcanizing agents and other volatile compounds, and stabilize the properties of vulcanized rubber. Commonly used equipment includes open rubber mixer, kneader and vacuum mixer. ?
Extended data:
Application of silicone rubber;
1. Construction industry. Used for bonding glass and metal curtain wall, roof sealing, door and window sealing, and bonding and sealing of various pools and tiles. ?
2. Electronic industry. The packaging and potting materials for electronic and electrical components can resist moisture, earthquake and impact, sudden temperature change and chemical corrosion. ?
3. mold. Silicone rubber is widely used in soft mold industry because of its excellent simulation and good demoulding performance. ?
4. Cars, ships and aviation. Used for automobile in-situ forming gasket, window seal, anti-corona of electronic and electrical connectors, etc.
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