Effects of chlorinated polypropylene based-adhesives on the bonding performance of an epoxy core rod and polyolefin sheath for composite insulators

Abstract One of the key technologies of composite insulators is the bonding between the core rod and sheath. This paper explores the use of chlorinated polypropylene-based adhesives to bond a polyolefin sheath material and an epoxy core rod. Dye penetration tests, bonding strength tests and water diffusion tests were carried out to evaluate the adhesiveness. The results demonstrated that the sample bonded by the chlorinated polypropylene/γ-methacryloxypropyltrimethoxysilane adhesive had the best interface tightness, and the bonding strength reached 7.34 MPa. Furthermore, the leakage current was as low as 41 μA after the sample was placed in boiling water for 100 h. This work provides a key bonding technology for polyolefin materials used as composite insulator sheaths.