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Thermally vulcanized silicone rubber vulcanization system

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Thermally vulcanized silicone rubber can be vulcanized by methods such as organic peroxides, aliphatic azo compounds, inorganic compounds, and high-energy rays. One of the most commonly used is the organic peroxide curing system. Because organic peroxides are generally stable at room temperature, they can quickly decompose and produce vulcanization at higher vulcanization temperatures (above 150°C). Under the initiation of organic peroxides, the rubber organic side chain groups undergo a vulcanization reaction to form C-C bond crosslinks. The more side chain groups such as vinyl groups, the easier it is to vulcanize and the higher the degree of crosslinking.

Organic peroxides for silicone rubber can be divided into two categories: general-purpose and special-purpose. The former is more active and can vulcanize various silicone rubbers, while the latter is less active and can only vulcanize vinyl-containing silicone rubber

The vulcanizing agent BP has a fast vulcanization speed, and is often used in molded products and continuous vulcanized products, and thick-walled products are not suitable. DCBP has a low decomposition temperature and only produces low vapor pressure products during decomposition. It is especially suitable for continuous hot air vulcanization of extruded products. The storage time of the rubber is short and it is easy to scorch. Vulcanizing agents BP and DCBP are explosive, and silicone oil and other products are commonly used as paste dispersions (generally 50%) to facilitate safe operation and dispersion.

The vulcanizing agent DTBP is volatile (boiling point 110°C), it is suitable for molecular sieve adsorption function, it will not react with air or carbon black, it can be applied to conductive rubber and products that are difficult to mold.

The vulcanizing agent DBPMH is very volatile at the vulcanization temperature, which can shorten the second-stage vulcanization time.

The vulcanizing agent DCP is a vinyl-specific type, with low volatility of decomposition products, suitable for vulcanization conditions with low external pressure.

The vulcanizing agent TBPB is suitable for sponge products. 

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