CN201106735Y - Three-layer polyethylene anti-corrosion pipe filled with solvent-free epoxy coating - Google Patents

Abstract

The utility model relates to a three-layer polyethylene anticorrosion pipe filled with solvent-free epoxy paint, which consists of a steel pipe (1), an epoxy powder coating (2), an adhesive layer (3), a polyethylene layer (4), It is composed of solvent epoxy coating (5) and heat shrinkable tape layer (6), and is characterized in that: epoxy powder coating (2), adhesive layer (3) and polyethylene layer (4) are sequentially coated on the steel pipe ( 1) on the outer surface of the steel pipe (8), the solvent-free epoxy coating (5) is coated on the surface of the steel pipe (8) at the welded section (7) of the steel pipe (1), and the heat-shrinkable tape layer (6) is coated on the solvent-free ring In addition to the oxygen coating (5), solvent-free epoxy coating is used in the construction of on-site pipeline joint joints. Sealing, waterproof, anti-chemical corrosion performance, convenient construction on site, guarantee the quality of joints, and can be used for anti-corrosion pipelines for transporting oil and gas.

Description

Three-layer polyethylene anti-corrosion pipe filled with solvent-free epoxy coating

technical field

The utility model relates to a three-layer polyethylene anticorrosion pipe filled with solvent-free epoxy paint, which can be used for anticorrosion pipelines for transporting oil and gas.

Background technique

At present, the main function of the sealing primer of the three-layer polyethylene anti-corrosion pipe is to improve the resistance to cathodic disbonding of the heat-shrinkable tape, and its anti-corrosion function is not outstanding; Difficult to stabilize, and the result is that the steel tube has no barrier in case the shrink band leaks into the water. Moreover, the epoxy primer of the heat-shrinkable tape is required to coat the heat-shrinkable tape in the surface-dry state of the primer, mainly because the current epoxy primer is based on the reactivity in the dry state and the thermal conductivity in the molten state. The hot melt adhesive on the shrink tape reacts to achieve the effect of fusion bonding; but after hard drying, it cannot produce effective fusion bonding with the hot melt adhesive, resulting in unqualified joints.

Utility model content

The purpose of this utility model is to provide a three-layer polyethylene anti-corrosion pipe with solvent-free epoxy coating. Performance, waterproof, anti-chemical corrosion performance, convenient construction on site, to ensure the quality of the joint.

The three-layer polyethylene anti-corrosion pipe with solvent-free epoxy coating filling described in the utility model consists of a steel pipe 1, an epoxy powder coating 2, an adhesive layer 3, a polyethylene layer 4, and a solvent-free epoxy coating 5. The heat-shrinkable tape layer 6 is composed of epoxy powder coating 2, adhesive layer 3, and polyethylene layer 4, which are sequentially coated on the outer surface of the steel pipe 1, and the solvent-free epoxy coating 5 is coated on the steel pipe 1 for welding. On the surface of the steel pipe 8 where the section 7 is welded, the heat-shrinkable tape layer 6 is coated on the outside of the solvent-free epoxy coating 5 .

Among them, the length of the steel pipe 1 is 8-24m, the outer diameter of the pipe is 273-1219mm, and the wall thickness is 5-22mm. The two ends of the reserved welding section 7 are each 150-200mm long. 3 has a thickness of 0.17-0.4 mm, the polyethylene layer 4 has a thickness of 1.8-4.0 mm, the solvent-free epoxy coating 5 has a thickness of 0.15-0.25 mm, and the heat-shrinkable tape layer 6 has a thickness of 2-4 mm. The overlapping length of the belt layer 6 and the polyethylene layer 4 is 100-300 mm.

A three-layer polyethylene anti-corrosion pipe filled with solvent-free epoxy coating is characterized in that the length of the steel pipe 1 is 12m, the outer diameter of the pipe is 1219mm, and the wall thickness is 22mm. The thickness of layer 2 is 0.2mm, the thickness of adhesive layer 3 is 0.23mm, the thickness of polyethylene layer 4 is 3.7mm, the thickness of solvent-free epoxy coating 5 is 0.2mm, and the thickness of heat shrinkable tape layer 6 is 2.5mm , The overlapping length of the heat-shrinkable tape layer 6 and the polyethylene layer 4 is 150mm.

The manufacturing process of the three-layer polyethylene anticorrosion pipe filled with solvent-free epoxy paint of the present utility model is as follows: the outer surface of the steel pipe 1 is sandblasted to remove rust, and the reserved welding section 7 is reserved, and the outer surface of the steel pipe 1 is coated with Epoxy powder coating 2, adhesive layer 3 and polyethylene layer 4. During the on-site pipeline connection construction, the reserved welding sections at both ends of the two three-layer polyethylene anti-corrosion pipes filled with solvent-free epoxy coating are connected and welded. After that, fill the mouth construction. Heat the temperature of the steel pipe 8 surface at the welding place to 40-50°C, perform sandblasting and derusting to make the steel surface treatment grade reach Sa2.5, and then use air blowing to remove the dirt on the steel pipe surface. Brush the solvent-free epoxy coating evenly on the surface of the steel pipe 8 at the welding place, so that the thickness of the solvent-free epoxy coating 5 reaches 0.2mm, heat the solvent-free epoxy coating 5 to 70±5°C, and measure it after heating for 10 minutes Thickness and electric spark leak detection, after ensuring that the required thickness is reached and there are no leaks, install the heat shrinkable tape 6.

The utility model has the beneficial effects compared with the prior art:

1. The three-layer polyethylene anti-corrosion pipe with solvent-free epoxy coating joints has simple production technology and convenient on-site joint construction.

2. Solvent-free epoxy coating is used to fill the joints. After the solvent-free epoxy coating is hard-dried, it has a high bonding force with the heat shrinkable tape, so that the joints have excellent sealing, water resistance, and chemical corrosion resistance. On-site construction It is convenient, guarantees the quality of the joint, and can be used for anti-corrosion pipelines for transporting oil and gas.

Description of drawings

Figure 1 is a longitudinal sectional view of a three-layer polyethylene anticorrosion pipe filled with solvent-free epoxy coating. In the figure: 1-steel pipe; 2-epoxy powder coating; 3-adhesive layer; 4-polyethylene layer; 5-solvent-free epoxy coating; 6-heat shrinkable tape layer; 7-reserved welding section; 8 -Steel tubes at welds.

Detailed ways

Three-layer polyethylene anti-corrosion pipe filled with solvent-free epoxy coating, the steel pipe 1 is 12m long, the outer diameter of the pipe is 1219mm, the wall thickness is 22mm, the thickness of the epoxy powder coating 2 is 0.2mm, and the thickness of the adhesive layer 3 is 0.23mm 1. The thickness of the polyethylene layer 4 is 3.7mm, and the length of each two ends of the reserved welding section 7 is 150mm. After the welded section is connected and welded, the joint construction is carried out. Heating the surface temperature of the steel pipe weld 8 to 40-50°C, performing sandblasting and derusting to make the steel surface treatment grade reach Sa2.5, and then use air blowing method to remove the dirt on the steel pipe surface. Brush the solvent-free epoxy coating evenly on the surface of the steel pipe weld 8, so that the thickness of the solvent-free epoxy coating 5 reaches 0.2mm, heat the solvent-free epoxy coating 5 to 70±5°C, and measure it after heating for 10 minutes Thickness and electric spark leak detection, after ensuring that the required thickness is reached and there are no leaks, install the heat shrinkable tape 6. The test results show that the solvent-free epoxy coating has strong adhesion to the heat shrinkable tape, the peel strength has reached above 80N/cm, and the joint has excellent sealing, water resistance and chemical corrosion resistance.

Claims (2)

1. A three-layer polyethylene anti-corrosion pipe filled with solvent-free epoxy paint, consisting of steel pipe (1), epoxy powder coating (2), adhesive layer (3), polyethylene layer (4), solvent-free ring Composed of oxygen coating (5) and heat shrinkable tape layer (6), it is characterized in that epoxy powder coating (2), adhesive layer (3) and polyethylene layer (4) are sequentially coated on the steel pipe (1) The outer surface of the steel pipe (8) is coated with a solvent-free epoxy coating (5) on the welded part of the steel pipe (1) reserved for welding (7), and the heat-shrinkable tape layer (6) is coated with a solvent-free epoxy coating Layer (5) outside. 2. The three-layer polyethylene anti-corrosion pipe filled with solvent-free epoxy coating according to claim 1, characterized in that: the steel pipe (1) has a length of 12m, an outer diameter of the pipe of 1219mm, and a wall thickness of 22mm, and a welding section (7 ) each end is 150mm long, epoxy powder coating (2) has a thickness of 0.2mm, adhesive layer (3) has a thickness of 0.23mm, polyethylene layer (4) has a thickness of 3.7mm, solvent-free epoxy coating The thickness of (5) is 0.2mm, the thickness of the heat-shrinkable tape layer (6) is 2.5mm, and the overlapping length of the heat-shrinkable tape layer (6) and the polyethylene layer (4) is 150mm.

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