All the silicone rubber products should be vulcanized, because the silicone rubber has a higher application value after vulcanization, mechanical properties are greatly improved, with unchanged viscosity, not easy to break, large elasticity, high temperature resistance, high tensile strength, insoluble in water in organic solvents and so on. Of course, not all need to vulcanize, like some thermoplastic silicone does not need to vulcanize, but natural rubber and synthetic silicone rubber need to use vulcanizing agents to vulcanize.


Silicone rubber vulcanization is divided into two stages: the first stage is divided into raw rubber, reinforcing agent, additive, vulcanization agent and structure control agent for raw material mixing, to obtain silicone rubber raw materials, the raw materials are prepared as semi-finished materials; In the second stage, the materials and finished materials are put into the metal molding and subjected to hot molding, extrusion, extrusion, injection and other processes, and the machine is stressed and the product catalyzes the fixed phone, and the molding is formed at high temperature!


In the process of silicone rubber vulcanization,? Common vulcanization processes for silicone rubber products are as follows:


First, the silicone rubber vulcanization process can be divided into direct vulcanization, indirect vulcanization and mixed gas vulcanization three methods, which depends on the vulcanization medium and vulcanization method.


1, direct vulcanization: put the product directly into hot water or steam medium for vulcanization.
2, indirect vulcanization: the product is placed in hot air vulcanization, this method is usually used for some products with strict appearance requirements, such as rubber shoes.
3, mixed gas vulcanization, first using air vulcanization, and then using steam direct vulcanization. This method can not only overcome the defects of steam vulcanization affecting the appearance of the product, but also overcome the shortcomings of slow hot air heat transfer, long vulcanization time and easy aging.


According to the different vulcanization process, silicone rubber products can be divided into cold vulcanization, room temperature vulcanization and hot vulcanization.


1, cold vulcanization: cold vulcanization can be used for the vulcanization of film products, the rubber products are immersed in a carbon disulfide solution containing 2% to 5% sulfur chloride, and then washed dry with water.
2, room temperature vulcanization: when room temperature vulcanization, the vulcanization process is carried out at room temperature and atmospheric pressure, such as using room temperature vulcanization glue (rubber solution) for bicycle inner tube joints, repairs, etc.
3, hot vulcanization: hot vulcanization is the main vulcanization method of silicone rubber products.