Resin-lined steel pipe and method for manufacturing same

• Main Authors: MIMURA, HIROYUKI, FUNATSU, SHINICHI, KARIYAZONO, YOSHIHISA
• Format: Patent
• Language: English
• Published: 01.12.2004
• Edition: 7
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; BLASTING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; LIGHTING; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PIPES; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A resin-lined steel pipe characterized by having an adhesive layer (which is preferably made of one or more of maleic anhydride-modified polyolefins, itaconic anhydride-modified polyolefins, ethylene-maleic anhydride copolymers, ethylene-maleic anhydride-acrylic acid copolymers, ethylene-maleic anhydride-acrylate copolymers, ethylene-acrylic acid copolymers, ethylene-acrylate copolymers, ethylene-methacrylic acid copolymers, ethylene-vinyl acetate copolymers, and ionomers, and has a melting termination temperature which is lower than the melting initiation temperature and higher than the service temperature of the plastic layer) on the interior surface of the steel pipe, and further having a plastic layer (preferably a polyolefin resin or a cross-linked polyolefin resin) inside the adhesive layer, with an initial longitudinal shear strength between the steel pipe and the plastic layer being 2.0 MPa or larger, the interior surface of the steel pipe having been previously subjected to a surface-preparation, by which a chemical treated film of phosphate subjected to a grain refining treatment is provided, and preferably having an epoxy primer layer between the steel pipe and the adhesive layer. A method of manufacturing the resin-lined steel pipe is also disclosed.