New steel pipeline anti-corrosion process adopting modified asphalt and polyethylene

Abstract

The invention relates to a new steel pipeline anti-corrosion process adopting modified asphalt and polyethylene. The process comprises the following steps: firstly, removing rust of a steel pipe, conveying and connecting the pipe, heating at medium frequency, spraying powder, putting modified asphalt powder in a high-speed mixer to form uniform modified asphalt powder through high-speed mixing, extruding the powder through an extruder circular die, coating or laterally wrapping and coating the outer surface of the steel pipe with the powder to form an anti-corrosion layer, extruding PE through another plastic extruder circular die, coating or laterally wrapping and coating the modified asphalt anti-corrosion layer with a layer of PE to form a protecting layer, thereby forming a complete modified asphalt and polyethylene steel pipeline anti-corrosion structure, wherein the raw materials are matched in parts by weight. By means of the process, the technical problems that existing anti-corrosion processes are serious in environmental pollution, large in energy consumption, bad in anti-corrosion effect, short in anti-corrosion life and the like are solved.

Description

Technical field:

[0001] The invention relates to a new process for external anticorrosion of buried pipelines, in particular to a new process for extrusion coating modified asphalt polyethylene steel pipelines for anticorrosion. Background technique:

[0002] At present, in various domestic oil fields and urban construction, there are many external anti-corrosion processes for steel pipelines, such as asphalt, glass cloth winding anti-corrosion process, glass fiber reinforced plastic anti-corrosion process, powder coating electrostatic spray anti-corrosion process, 2PE, 3PE anti-corrosion process, etc.; currently used Most of them are: asphalt and glass cloth winding anti-corrosion process, 3PE anti-corrosion process, but asphalt and glass cloth winding anti-corrosion process, the pollution is large, boiling asphalt consumes a lot of coal, emits a large amount of greenhouse gases, waste residues, harmful gases, and pollutes the environment. Harm to the human body; Take the m...