Anti-ageing seal gasket used for valve

The invention discloses an anti-ageing seal gasket used for a valve. The anti-ageing seal gasket is prepared from, by weight, 80-120 parts of natural rubber, 55-65 parts of nitrile rubber, 20-30 partsof methyl vinyl silicone rubber, 50-70 parts of a filling and reinforcing agent, 4-8 parts of a polypropylene composite, 1-2 parts of pine tar, 2-4 parts of stearic acid, 4-8 parts of a plasticizer,2-3 parts of 4,4'-dithiodimorpholine, 1-2 parts of dibenzoyl peroxide, 1-2 parts of tert-butyl peroxybenzoate, 2-4 parts of an anti-ageing agent and 0.5-1.5 parts of a lubricating agent, wherein the polypropylene composite is prepared by using the technology comprising the following steps that polypropylene, methacrylic acid and epoxidized soybean oil are evenly mixed, subjected to plasma irradiation and smashed, then polyethylene wax id added, and all the materials are stirred to obtain the polypropylene composite. The anti-ageing seal gasket used for the valve has the advantages of being high in tensile strength, hig