3PE anti-corrosion coating for steel pipe is also (three-layer polyethylene anti-corrosion coating), which is a new type of anti-corrosion coating composed of European 2PE anti-corrosion coating and epoxy anti-corrosion steel coating (FBE), which is widely used in North America. Steel pipe coating. It has been recognized and used for more than ten years. 3PE anticorrosive steel pipe coating is epoxy end anticorrosive coating contacting with the bottom of steel pipe, and the middle layer is copolymer adhesive with branch functional groups. The top layer is high density polyethylene anticorrosive coating. The three-layer PE coating combines the high impermeability and high mechanical properties of epoxy resin and polyethylene materials. As a kind of pipeline anticorrosive coating with good effect and excellent performance, it has been widely used in the world. Its full name is fusion bonded epoxy resin / extruded polyethylene structure protective layer. The structure consists of three layers: the bottom layer is sintered epoxy resin (≥ 80 μ m); the middle layer is adhesive (170-250 μ m); the surface layer is extrusion. Polyethylene (about 2 mm). The total thickness of the cover is about 1.8-3.7 mm. The thickness of epoxy powder anti-corrosion coating for 3PE anticorrosive steel pipe is 250 μ m, which is more than three times of the deepest point of shot blasting, 70 μ m, while the domestic standard is 150 μ m, which can not reach three times of the maximum shot blasting depth. The temperature requirement of 70 μ M, t epoxy powder coating should be above 200 ℃. Many of our anti-corrosion treatment companies control the spraying temperature between 100 and 120 ℃, which affects epoxy The setting strength of the powder, in addition to the epoxy powder.
Polyethylene graft adhesive should be used between polyethylene films. In order to reduce the engineering cost, at present, many processing enterprises of anticorrosion and thermal insulation engineering adopt traditional hot-melt adhesive, which makes the service life of rubber and polyethylene uneven, which restricts the development of 3PE anti-corrosion steel pipe industry in China. One of the important factors is that if spiral pipe is used in pipeline construction, the weld height is 2mm. T-mold winding method can not completely cover the groove on both sides of the weld and can not completely exhaust air. Taboo in antiseptic process! If the pipe is laid with large diameter steel pipe and heavy self weight, hard objects such as pipe trench center stone will be encountered, which will damage polyethylene and fragile epoxy powder. Cause the corrosion problem of pipeline. High temperature prefabricated directly buried insulation pipe not only has advanced technology and practical performance, but also has remarkable social and economic benefits, which is a kind of power. Sufficient heating energy-saving measures.
