Preparation and properties of RTV transparent silicone rubber reinforced by modified silica
The demethanol condensation type RT-vulcanized silicone rubber was prepared by adding Hexamethyldisiloxane-sio2,dimethylchlorosilane-sio2 and Hexamethyldisilazane-sio2 as reinforcing filler,methyltrimethoxy-silane as crosslinking agent and octyl tin as catalyst on alkoxy-terminated polydimethylsiloxane as matrix.The mechanical properties,micro-morphology and aging properties of silicone rubber were characterized by microcomputer tensile testing machine,scanning electron microscopy and other characterization equipment.The results show that when the mixing ratio of modified silica filler and alkoxy terminated polydimethylsiloxane is 1∶10,the transparent silicone rubber reinforced with large specific surface area siloxane-sio2 Has the Highest transparency.The tear strength,tensile strength and elongation at break were 11.75 n/mm,1.83 MPa and 434%,respectively.
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