What Are The Functions of The Structural Components of 3PE Anti-corrosion Steel Pipe

3PE anti-corrosion steel pipe is a relatively advanced anti-corrosion technology in recent years. Its full name is fused epoxy/extruded polyethylene structural protective layer. The structure of 3PE anti-corrosion steel pipe consists of the following three layers: the bottom layer is fused epoxy; the middle layer is adhesive; the surface layer is extruded polyethylene.

In the three-layer structure, the main function of epoxy primer is: to form a continuous coating film, directly bonded to the surface of the steel pipe, with good chemical corrosion resistance and anti-cathodic stripping performance; react with the active groups of the middle layer adhesive to form chemical bonding, ensuring that the overall anti-corrosion layer has good bonding at higher temperatures. The middle layer is usually a copolymer adhesive, the main component of which is polyolefin, and vinyl copolymer adhesive is currently widely used. The polar functional groups of the copolymer adhesive can react with the epoxy groups of the epoxy primer to form hydrogen bonds or chemical bonds so that the middle layer and the bottom layer form a good bond; and the non-polar ethylene part has a good affinity with the surface polyethylene, so the middle layer and the surface layer also have good bonding properties. The main function of the polyethylene surface layer is mechanical protection and anti-corrosion, which has the same function as the traditional two-layer polyethylene anti-corrosion layer.