Does vinyl silicone oil improve elongation and elasticity in methyl vinyl silicone? How to choose vinyl content and viscosity?
The lower the viscosity of vinyl, the better, and on the contrary, it does not require a vulcanization process. To put it bluntly, the purpose of adding silicone oil is to improve the elastic modulus, which is equivalent to adding plasticizers to other polymers. If the vinyl silicone oil is also co-cured, its intermolecular lubricating ability will be seriously reduced, which is equivalent to secondary cross-linking. Generally, the increase of elongation at break of silicone rubber is obtained by inert filling of plasticizer. Under the saturated state of extrusion to ensure no oil, the silicone rubber you extrude will reach the maximum elongation rate— —Similarly, you can also refer to similar elastomers such as SBS, NBR and PU. The plasticizers added in them are also non-reactive phthalates. The elastomers generally have soft segments and hard segments. The cross-linking of silicone is inclined to the hard segment, please refer to it as appropriate (vulcanization without cross-linking means plasticization, and vulcanization and cross-linking means hardening).