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What are the functions of 3pe anti-corrosion steel pipeline structure composition


3pe anti-corrosion steel pipe is a more advanced anti-corrosion technology in recent years. its full name is the fusion bonded epoxy/extruded polyethylene structural protective layer. the structure of 3pe anti-corrosion steel pipe is composed of the following three layers: the bottom layer is fusion bonded epoxy; the layer is adhesive; the surface layer is extruded polyethylene.

in the three-layer structure, the main function of the epoxy primer is to form a continuous coating film, which is directly bonded to the surface of the steel pipe, and has good chemical corrosion resistance and cathodic stripping resistance; the reaction forms a chemical bond, which ensures that the overall anti-corrosion layer has good adhesion at higher temperatures. the middle layer is usually a copolymer adhesive, whose main component is a polyolefin, and vinyl copolymer adhesive is widely used at present. the polar part of the copolymer adhesive and the epoxy group of the epoxy primer can react to form hydrogen bonds or chemical bonds, so that the middle layer and the bottom layer form a good bond; the non-polar ethylene part and the surface layer of polyethylene have the same very good affinity, so the middle layer and the surface layer also have good bonding performance. the main function of the polyethylene surface layer is to play the role of mechanical protection and anti-corrosion, which has the same function as the traditional two-layer structure polyethylene anti-corrosion layer.

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