Low temperature vulcanized silicone rubber, also known as liquid silicone rubber, is a type of polysiloxane elastomer material with a vinyl end group. The general vulcanization temperature is 40-120 ℃, which is between hot vulcanization and room temperature vulcanization. It can use Si-H based hanging energy polysiloxane as cross-linking agent, carry out Addition reaction in the presence of catalyst to complete cross-linking, also known as addition silicone rubber.

The commonly used catalyst is an organic platinum complex. Newer varieties include coordination compounds containing vinyl low molecular weight polysiloxanes. The amount of catalyst used is minimal.

To adjust the active period of the adhesive and improve storage stability, reaction inhibitors can be used, usually acetylene compounds, as well as compounds containing amines, tin, phosphorus, etc.

The vulcanization system has high activity, and if stored improperly, the rubber material will also partially crosslink at room temperature. Therefore, in addition to using reaction inhibitors, the rubber material generally needs to be prepared in a two component form: one component contains crosslinking agents, and the other component contains catalysts, similar to two component room temperature vulcanized silicone rubber. When using, measure and mix according to regulations. In this way, the storage period of the adhesive material is longer, and it can reach over 1 year at room temperature. The vulcanization rate of the addition molding system is highly dependent on temperature.

Addition molded silicone rubber can not only be vulcanized at low temperatures, but can also be vulcanized at high temperatures for a short period of time. Addition silicone rubber generally does not require secondary vulcanization, as there are no low molecular weight condensation by-products produced during the vulcanization process. However, when it is necessary to reduce the compression deformation of vulcanized rubber, secondary vulcanization must be carried out.