The main contents of the specification:
In this paper, the preparation process of adhesive layer is changed from the existing extruder to electrostatic powder spraying, that is, the rubber powder is sprayed on the epoxy powder layer in the gelatinization process to replace the large extruder, which solves the problems of difficult operation control and unstable peeling performance among the three layers in the original process.
The invention can improve the integrity of the three-layer structure, improve the adhesion and cathodic stripping resistance of the three-layer structure anticorrosive coating, save extruder equipment, reduce the cost of the three-layer structure anticorrosive coating, and provide a more efficient technology for painting the elbow anticorrosive coating.
After on-site coating test and coating performance test and evaluation, the coating test results of the new process reached the national standard, passed the audit of China National Intellectual Property Administration, and obtained the invention patent.
Extended data:
Inner wall anticorrosive coating: a thin film coated on the inner wall of pipeline to prevent pipeline corrosion, reduce friction resistance and increase transportation capacity. Commonly used coatings are amine cured epoxy resin and polyamide epoxy resin, and the coating thickness is 0.038 ~ 0.2 mm
In order to ensure that the coating is firmly bonded to the pipe wall, the inner wall of the pipe must be surface treated. Since 1970s, there has been a tendency to use the same material to coat the inner and outer walls of pipelines, so that the coating of the inner and outer walls of pipelines can be carried out at the same time.
Anti-corrosion and thermal insulation coating: In order to reduce the heat loss of the pipeline to the soil, a thermal insulation and anti-corrosion composite layer is added to the outside of the medium and small diameter pipeline for transporting crude oil or fuel oil.
The commonly used thermal insulation material is rigid polyurethane foam, and the applicable temperature is-185 ~ 95℃. This material is soft. In order to improve its strength, a layer of high density polyethylene is added outside the insulation layer to form a composite structure to prevent groundwater from infiltrating into the insulation layer.
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