All silicone rubber products need to be vulcanized because the silicone rubber has high application value after vulcanization, and its mechanical properties have been greatly improved. It has the characteristics of constant viscosity, not easy to break, large elasticity, high temperature resistance, high tensile strength, and insoluble in water in organic solvents. Of course, not all of them need to be vulcanized, such as some thermoplastic silicone, but natural rubber and synthetic silicone rubber need to be vulcanized with vulcanizing agent.
The vulcanization of silicone rubber is divided into two stages: the first stage is divided into raw rubber, reinforcing agent, additive, vulcanizing agent and structure control agent for raw material mixing to obtain the raw material of silicone rubber, and blending the raw material into semi-finished material; In the second stage, the materials and finished materials are put into the metal molding and subjected to heat molding, extrusion, extrusion, injection and other processes, and the molding process is high-temperature molding through the machine force and product catalytic fixation!
In the process of vulcanization of silicone rubber,? Common vulcanization processes of silicone rubber products are as follows:
1γ The vulcanization process of silicone rubber can be divided into three methods: direct vulcanization, indirect vulcanization and mixed gas vulcanization, which depends on the curing medium and curing method.
1. Direct vulcanization: put the product directly into hot water or steam medium for vulcanization.
2. Indirect vulcanization: The product is vulcanized in hot air. This method is usually used for some products with strict appearance requirements, such as rubber shoes.
3. Mixed air vulcanization, first air vulcanization, and then steam direct vulcanization. This method can not only overcome the disadvantages of steam curing affecting the appearance of products, but also overcome the disadvantages of slow heat transfer of hot air, long curing time and easy aging.
2γ According to different vulcanization processes, silicone rubber products can be divided into cold vulcanization, room temperature vulcanization and hot vulcanization.
1. Cold vulcanization: cold vulcanization can be used for vulcanization of film products. Immerse rubber products in carbon disulfide solution containing 2%~5% sulfur chloride, and then wash them dry with water.
2. Room temperature vulcanization: when curing at room temperature, the vulcanization process is carried out at room temperature and normal pressure, for example, using room temperature vulcanized rubber paste (rubber compound solution) for the joint and repair of bicycle inner tube.
3. Thermal vulcanization: thermal vulcanization is the main vulcanization method for silicone rubber products.
For silicone rubber, please check the details:
https://www.siliconerubbers.net/product-general-grade-htv-silicone-rubber.html 
