Sealing gasket for hydraulic cylinder and preparation method thereof

The invention discloses a sealing gasket for a hydraulic cylinder and a preparation method thereof. The sealing gasket is prepared from the raw materials including nitrile rubber, epichlorohydrin rubber, polyformaldehyde (POM), polyisobutene, 2,4-dichlorobenzoyl peroxide, 2,2'-disulfide dibenzo thiazine, dioctyl sebacate, n-butyl methacrylate, microcrystalline wax, modified wollastonite, nano sepiolite, calcium sulfate whiskers and the like. On the basis of blending of the nitrile rubber and the epichlorohydrin rubber, POM and polyisobutene are also added, so that the performances such as the oil resistance, the temperature tolerance, the abrasive resistance, the compressive strength and the like of the rubber can be improved; and the modified wollastonite is also added, so that the dispersibility of the wollastonite in the rubber can be obviously improved; and the performances such as the mechanical strength, the oil resistance, the abrasive resistance, the high thermal resistance and the like of a seal material are improved.