Compound sealing strip for oil tank of transformer and manufacture method thereof

The invention discloses a compound sealing strip for an oil tank of a transformer and a manufacture method thereof. An inner sealing strip is arranged at the vertical inner side face of a middle sealing strip, an outer sealing strip is arranged at the vertical outer side face of the middle sealing strip. The middle sealing strip is a butyronitrile rubber strip; the inner sealing strip and the outer sealing strip are acrylic ester rubber strips or chlorohydrine rubber strips. The manufacture method comprises the steps of mixing rubber, blanking, compound extruding and vulcanizing. Through various tests, the compound sealing strip for the oil tank of the transformer manufactured by the method is to have advantages of good sealing performance, good compressed permanent deformation, good anti-crack and anti-aging performance, low production cost, long service life, little pollution to transformer oil and the like. After the sealing strip is installed on the transformer, the use of infectant ingredient is avoided, the technical problem of polluting the transformer oil is solved, the service life of the compound sealing strip for the oil tank of the transformer is prolonged, and the safe operation of the transformer is ensured. The invention can be generalized and used on the transformer.