Preparation method of ultra-low cold-resistant ethylene propylene diene monomer sealing ring

In order to solve the problem of poor cold resistance of an ethylene propylene diene monomer sealing material, the invention provides the preparation method of the ultra-low cold-resistant ethylene propylene diene monomer sealing ring, and the preparation method specifically comprises the following steps: silicone oil grafted EPDM, modified Na-montmorillonite and commercial EPDM are used together. On the basis, paraffin oil, a vulcanizing agent, an accelerant and the like are compounded, and a product can be obtained through mixing and vulcanizing. According to the invention, the used organic silicon modified EPDM can significantly improve the cold resistance, and has good compatibility with EPDM; the organic montmorillonite is added, so that the processing property of the rubber material is improved, and the toxic and side effects and the pollution to the environment are reduced by using the environment-friendly compounding agent. The preparation process is simple, and large-scale preparation is easy; the pr