Since the Kedu long-distance pipeline in the 1950s quoted the oil bitumen anticorrosion technology of the former Soviet Union, oil bitumen has been the anticorrosion layer commonly used in my country for a long period of time. In the 1970s and 1980s, various anticorrosive materials such as adhesive tapes, jackets, epoxy powders, etc. were successively put into use, and the situation of petroleum asphalt domination began to change. In 1995, the coal tar enamel anti-corrosion layer began to be applied in the pipelines of Luku Double Track and Jingxi.In the late 1990s, two anti-corrosion layers of fused epoxy powder (FBE) and three-layer polyethylene (three-layer PE) gradually became the mainstream. In recent years, double-layer epoxy (double-layer FBE) has gradually begun to be applied on a large scale.
The main function of 3PE anti-corrosion steel pipe sintered epoxy powder coating is to form a continuous coating film and directly bond to the surface of the steel pipe, which has good chemical resistance and anti-cathode peeling performance; and the active group of the intermediate layer adhesive The reaction forms a chemical bond to ensure that the overall anti-corrosion layer has good adhesion at higher temperatures. The intermediate layer is usually a copolymer binder, the main component of which is polyolefin, and currently a vinyl copolymer adhesive is widely used. The functional part of the polar part of the copolymer adhesive and the epoxy group of the sintered epoxy powder coating can react to form hydrogen bonds or chemical bonds, so that the intermediate layer and the bottom layer form a good bond; the non-polar ethylene part and the surface layer Polyethylene has a good affinity, so the middle layer and the surface layer also have good adhesion properties. The main role of the polyethylene surface layer is to play a mechanical protection and anti-corrosion role, and the traditional two-layer structure polyethylene
Realize automatic control of the whole machine