Views: 2 Author: Site Editor Publish Time: 2020-12-16 Origin: Site
3pe anticorrosive steel pipes are pipes (steel pipes) used in different working environments. In order to slow down or prevent the pipes from being corroded and deteriorated by the chemical or electrochemical action of the external medium or by the metabolic activities of microorganisms, the outer wall of the pipe is coated with 2 layers or 3 Layer polyethylene (3PE) to achieve pipeline anti-corrosion, 3pe anti-corrosion pipe life extension 3-5 times.
3PE anticorrosive steel pipe polyethylene three-layer structure protective layer, also known as three-layer PE (3PE), is an advanced anti-corrosion technology introduced from abroad in recent years. Its full name is fusion bonded epoxy/extruded polyethylene structure protective layer. The structure consists of the following three layers: the bottom layer is fusion bonded epoxy (≥80μm); the middle layer is adhesive (170-250μm); the surface layer is extruded Polyethylene (about 2mm). The total thickness of the protective layer is about 1.8-3.7mm.
In the three-layer structure, the main function of the fusion-bonded epoxy powder coating is: to form a continuous coating film, which is directly bonded to the surface of the steel pipe, and has good chemical resistance and cathodic stripping resistance; it is compatible with the intermediate layer adhesive The active groups react to form chemical bonds, ensuring that the overall anti-corrosion layer has good adhesion at higher temperatures. The middle layer is usually a copolymer adhesive, and its main component is polyolefin. Currently, vinyl copolymer adhesives are widely used.
The functional groups of the polar part of the copolymer adhesive can react with the epoxy groups of the fused epoxy powder coating to form hydrogen bonds or chemical bonds, so that the middle layer and the bottom layer can form a good bond; the non-polar vinyl part and the surface layer Polyethylene has a good affinity, so the middle layer and the surface layer also have good bonding properties. The main function of the polyethylene surface layer is to play a mechanical protection and anti-corrosion effect, which has the same effect as the traditional two-layer structure polyethylene anti-corrosion layer.