High shearing force three-layered polyolefin anti-corrosive thermal insulation steel pipe and manufacturing process thereof

Abstract

The invention belongs to the field of anti-corrosive thermal insulation steel pipes, and particularly relates to a high shearing force three-layered polyolefin anti-corrosive thermal insulation steel pipe and a manufacturing process thereof. The steel pipe includes a three-layered polyolefin anti-corrosive pipe, which sequentially includes a steel pipe body, an epoxy resin layer, a glue adhesive layer and a polyolefin layer from inside to outside, wherein a polyethylene jacket pipe is jacketed outside the anti-corrosive pipe, and a polyurethane foaming material layer is arranged between the anti-corrosive pipe and the polyethylene jacket pipe. The manufacturing process is mainly used for the compound treatment of shot blasting and flame heating polarization on the polyolefin layer. The process not only enhances the adhesive properties of the polyurethane foaming material layer and the polyolefin layer on the 3PE anti-corrosive pipe surface, so as to improve the shearing strength of the 3PE anti-corrosive foaming jacket pipe, but also doesn't damage the anti-corrosive performance of the epoxy powder layer in the 3PE anti-corrosive pipe, so as to break through the limit of manufacturing big-shearing force thermal insulation pipe through utilizing the 3PE anti-corrosive pipe, so as to solve the difficulties of the industry, and provide a reliable anti-corrosive thermal insulation steel pipe product for crossing special areas as marsh and mire.

Description

technical field [0001] The invention relates to a high-shear force three-layer polyolefin anti-corrosion and heat-retaining steel pipe and a manufacturing process thereof, belonging to the field of anti-corrosion and heat-retaining steel pipes. Background technique [0002] The anti-corrosion and heat preservation of domestic long-distance pipelines usually use polyolefin foam jacket pipes, and the inner anti-corrosion pipes adopt different anti-corrosion processes according to the requirements of corrosion resistance grades. Under normal circumstances, the inner anti-corrosion pipe is produced by single-layer epoxy coating, double-layer epoxy coating and other processes. However, for anti-corrosion and heat-preservation pipes used in special areas such as swamps and quagmires, due to the harsh environment, it is required to improve the corrosion resistance of the pipes. The anti-corrosion of steel pipes usually adopts a three-layer polyolefin (3LPO) anti-corrosion structure...

AI Technical Summary

Problems solved by technology

If the three-layer polyolefin (3LPO) anti-corrosion pipe is used to produce the foam jacket pipe, there is no effective polarization treatment for the anti-corrosion layer, and it is difficult to ensure the shear strength between the foam and the anti-corrosion layer

The outer layer of the three-layer polyolefin (3LPO) anti-corrosion pipe anti-corrosion layer is polyolefin material. Take polyethylene as an example: polyethylene is a non-polar material. Because of its high crystallinity and the existence of a boundary layer, the polyethylene layer is very Difficult to bond effectively with polyurethane foam insulation

Images