Preparation method of tear resistant silicone rubber mold

The invention provides a preparation method of a tear resistant silicone rubber mold. The method includes the steps of: (1) crushing Carex meyeriana fiber, adding ammonia water, conducting water bath stirring, taking the Carex meyeriana fiber out and performing washing, and then carrying out drying to a constant weight to obtain alkalized Carex meyeriana fiber; (2) mixing amino silicone oil, anhydrous ethanol and sodium hexadecyl benzene sulfonate to obtain a modified emulsion, adding the modified emulsion and alkalized Carex meyeriana fiber into a reaction kettle, introducing nitrogen to carry out reaction, then taking the material out and performing washing, and carrying out drying to a constant weight to obtain modified Carex meyeriana fiber; (3) adding siloxane, BR and the modified Carex meyeriana fiber into an open mill, performing mixing, then transferring the materials into a single screw extruder to conduct melt extrusion, thus obtaining a base material; and (4) adding a reinforcing agent, a heat-resistant agent, a crosslinking agent, a thixotropic agent, a stabilizer, weight increase filler into the base material, mixing the materials evenly by a kneader, adding a vulcanizing agent and a promoter, mixing the materials uniformly, carrying out vacuum degassing, then pouring the mixture into a die, and conducting solidification under room temperature, thus obtaining the tear resistant silicone rubber mold. The silicone rubber mold prepared by the method provided by the invention has good tear resistance.