3PE anti-corrosion and insulation equipment

3PEIntroduction to the Structure of Anti corrosion Pipeline Equipment

The anti-corrosion layer is crucial for the lifespan of buried pipelines,Pipes of the same material,Some are buried underground for decades without corrosion,Some leaks occur within a few years. It's because they use different external anti-corrosion coatings. Polyethylene three-layer structure protective layer, also known as three-layerPE,It is an advanced anti-corrosion technology introduced from abroad in recent years. Its full name is fusion bonded epoxy/Extruded polyethylene structural protective layer,The structure consists of three layers: the bottom layer is fusion bonded epoxy(60—80μm)The middle layer is adhesive(170—250μm)The surface layer is extruded polyethylene(make an appointment2mm)The total thickness of the protective layer is greater than2.2—2.9mmIn a 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,Has excellent chemical corrosion resistance and cathodic stripping resistance; Reacts with the active groups of the intermediate layer adhesive to form a chemical bond,Ensure that the overall anti-corrosion coating has good adhesion at high temperatures. The intermediate layer is usually a copolymer binder,Its main component is polyolefin,The widely used adhesive currently is ethylene based copolymer adhesive. The polar functional groups of copolymer adhesives can react with the epoxy groups of epoxy primers to form hydrogen bonds or chemical bonds,Form a good bond between the middle layer and the bottom layer; The non-polar ethylene portion has a good affinity with the surface layer polyethylene,So the intermediate layer and the surface layer also have good bonding performance. The main function of polyethylene surface layer is to provide mechanical protection and anti-corrosion function,It has the same function as the traditional two-layer structure polyethylene anti-corrosion layer. The three-layer structure of polyethylene anti-corrosion coating combines the excellent properties of epoxy coating and extruded polyethylene anti-corrosion coating,Interface characteristics and chemical resistance of epoxy coatings,Combined with the advantages of mechanical protection properties of extruded polyethylene anti-corrosion coating,Thus significantly improving their respective performance. Therefore, as an external protective layer for buried pipelines, it is very superior. According to relevant information,three layersPECan extend the lifespan of buried pipelines50year,currently,Internationally recognized as the most advanced pipeline external anti-corrosion technology