What are the functions of 3PE anti-corrosion steel pipelines

3pe anti-corrosion coated steel pipeline is a relatively advanced technology in recent years. its full name is fused epoxy/extruded polyethylene structural protective layer. the structure of the 3pe anti-corrosion coated steel pipeline is composed of the following three layers: the bottom layer is connected to epoxy; the middle layer is adhesive; the surface layer is extruded polyethylene.

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