Why Should Silicone Rubber Products Be Vulcanized? What Are The Vulcanization Processes?

After vulcanization, silicone rubber has a higher application value, and its mechanical properties are greatly improved. It has the characteristics of constant viscosity, not easy to break, great elasticity, high temperature resistance, high tensile strength, and insoluble in water in organic solvents.

Not all of them need to be vulcanized, as some thermoplastic silicone does not, but natural and synthetic silicone rubber do need to be vulcanized using a vulcanizing agent.

Silicone rubber vulcanization in two stages: the first phase is divided into raw rubber and reinforcing agent, additives, curing agent and structure control agent for raw materials mixing, silicone rubber raw materials, mixing the raw material for half the material, the second phase in the material and finished product material into the hardware mold heat moulding and extrusion, extrusion, injection, such as process, with force and the machine product catalytic fixed-line, moulded by high temperature to shape.

During the vulcanization of silicone rubber, Common vulcanization processes for silicone rubber products are as follows:

1. Silicone rubber vulcanization process can be divided into direct vulcanization, indirect vulcanization and mixed gas vulcanization three methods, depending on the vulcanization medium and vulcanization way.

   1.1  Direct vulcanization: Vulcanization of a product by placing it directly into a hot water or steam medium.

   1.2  Indirect vulcanization: Vulcanization of products by placing them in hot air. This method is usually used for products with strict appearance requirements, such as rubber shoes.

   1.3  Mixed air vulcanization, first air vulcanization, then steam direct vulcanization.This method can not only overcome the disadvantages of steam vulcanization affecting the appearance of products, but also overcome the disadvantages of slow heat transfer by hot air, long curing time and easy aging.

   
   

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

   2.1 Cold vulcanization: Cold vulcanization can be used for the vulcanization of thin film products by immersing rubber products in a solution of carbon disulfide containing 2%~5% sulfur chloride and then washing and drying them with water.

   2.2  Room temperature vulcanization: When room temperature is vulcanized, the vulcanization process is carried out at room temperature and pressure, such as the use of room temperature vulcanized rubber pulp (mixed rubber solution) for bicycle inner tube joints, repair, etc.

   2.3  Thermal vulcanization: Thermal vulcanization is the main vulcanization method for silicone rubber products.

   
   

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