Rubber material for pack-off element of telescopic joint and preparation method for rubber material

The invention relates to a rubber material for a pack-off element of a telescopic joint and a preparation method for the rubber material. The material contains hydrogenated nitrile-butadiene rubber, carboxylated nitrile-butadiene rubber, staple fibers, carbon black, wear-resistant filler, a plasticizer, an anti-aging agent, a vulcanizing agent, a vulcanization accelerator and a vulcanization activator. The preparation method comprises the preparation steps: (1) proportionally weighing the hydrogenated nitrile-butadiene rubber, the carboxylated nitrile-butadiene rubber, the vulcanization activator, the staple fibers, the carbon black, the wear-resistant filler, the anti-aging agent and the plasticizer, sequentially putting the weighed ingredients into an internal mixer, carrying out conventional milling according to the conventional rubber processing method, carrying out roll release, and carrying out tight milling in an open mill; (2) putting the tight-milled rubber mass into an internal mixer, adding the vulcanizing agent and the vulcanization accelerator into the internal mixer, carrying out uniform milling, then, carrying out roll release, and carrying out normal-temperature placement; (3) carrying out back mixing on the milled rubber, and then, carrying out vulcanization forming, thereby preparing rubber telescopic joint pack-off elements. The rubber material provided by the invention has extremely excellent wear resistance, extrusion resistance and adhesion property on the basis of guaranteeing good physical and mechanical properties, so that service lives of products are greatly prolonged.