Mould silicone rubber is generally composed of base glue, crosslinking agent, catalyst, filler, etc.


(1) The base rubber is 107 silicone rubber, called hydroxy-terminated polydimethylsiloxane. This mold silicone rubber can be cured at room temperature, has good fluidity, no deformation, only a small linear shrinkage.


(2) The crosslinking agent is ethyl orthosilicate. The amount of crosslinking agent has obvious influence on the curing time, tearing strength and elongation of silicone rubber. Practice has proved that the amount of crosslinking agent is appropriate to 5% (mass fraction) of the base adhesive.


(3) The catalyst is dibutyltin dilaurate. The amount of catalyst added has a direct relationship with the curing time, and it should not be too much, generally 1%-2% (mass fraction).


(4) fillers, talc powder, quartz powder, white carbon black. Generally use talc powder as filler. If white carbon black is used as filler, the mechanical strength, tearing strength and uniformity are significantly improved.