Sealing element for cable joint, sealing element material formula and preparation method

The invention discloses a sealing element for a cable joint, a sealing element material formula and a preparation method, and relates to the technical field of cable accessories. The sealing element material formula for the cable joint comprises a sealing sleeve, a bulge pipe is arranged in the middle of the sealing sleeve, and a telescopic pipe is arranged on the bulge pipe; the sealing sleeve, the bulge pipe and the telescopic pipe are of an integrated structure, and a material formula used for producing the sealing element comprises natural rubber, sulfur, magnesium oxide, magnesium hydroxide, tridecafluorooctyltrimethoxysilane, trioctyl trimellitate, an anti-aging agent DPN1-2, bisphenol A and paraffin. The invention also provides a preparation method of the sealing element by using the sealing element material formula for the cable joint. The sealing element is flexible and convenient to use and good in sealing effect, has good hydrophobicity on the premise that it is guaranteed that the sealing element