Anti-corrosion painting material treatment method for pipeline external surface

A technology of spraying materials and anti-corrosion treatment, which is applied in the direction of pipeline anti-corrosion/rust protection, pipeline protection, damage protection, etc. Strong anode stripping ability, good anti-corrosion performance, and strong root thorn ability for deep-rooted plants

Inactive Publication Date: 2005-09-28
左树清
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The combination of three different families of materials presents a risk of delamination
[0004] The 3PE anti-corrosion layer is composed of bottom epoxy powder, middle layer adhesive and surface layer polyethylene. There are obvious interfaces between the three different families of materials. The process parameters are not adjusted properly during production, and there is a danger of delamination when air enters during coating. Delamination will cause peeling, and it is not easy to find, but it is often easy to find clues (such as warped edges) at the end of the pipe
[0005] 2. The thinning of the outer anti-corrosion layer of the we

Method used

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  • Anti-corrosion painting material treatment method for pipeline external surface

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] according to figure 1 Shown technology, the present invention carries out according to the following steps:

[0038] 1. Pre-treatment of steel pipes: sandblasting and trimming the outer surface of steel pipes;

[0039] 2. Steel pipe preheating: the temperature of the preheating furnace is 190°C, and the temperature of the steel pipe reaches 150°C;

[0040] 3. After the steel pipe is preheated, use electrostatic spraying equipment to gradually spray on the outer surface of the steel pipe:

[0041] a. Spray a layer of epoxy resin first: use epoxy resin with a particle size of 100 mesh, control the spraying time per centimeter of pipe within 2 to 3 seconds, and the thickness of epoxy resin after spraying is 0.08mm;

[0042] b. Then spray a layer of hot melt adhesive: use hot melt adhesive with a melting point of 110-120°C, and the thickness of the hot melt adhesive is 0.1mm;

[0043] c. Then spray polyethylene, the thickness of polyethylene is 1mm

[0044] 4. After spr...

Embodiment 2

[0047] 1. Pre-treatment of steel pipes: sandblasting and trimming the outer surface of steel pipes;

[0048] 2. Steel pipe preheating: the temperature of the preheating furnace is 180°C, and the temperature of the steel pipe reaches 160°C;

[0049] 3. After the steel pipe is preheated, spray on the outer surface of the steel pipe step by step

[0050] a. Spray a layer of epoxy resin first, use epoxy resin with a particle size of 130 mesh, control the spraying time per centimeter of pipe within 2 to 3 seconds, and the thickness of epoxy resin at 0.09mm

[0051] b. Continuously spray a layer of hot melt adhesive, use hot melt adhesive with a melting point of 110-120°C, and the thickness of the hot melt adhesive is 0.2mm

[0052] c. Then spray polyethylene, the thickness of polyethylene is 1.5mm

[0053] 4. After spraying three layers of materials, the steel pipe needs to be solidified and leveled at 210°C for 35min. 5. The steel pipe is taken out of the furnace and cooled to c...

Embodiment 3

[0055] 1. Pre-treatment of steel pipes: sandblasting and trimming the outer surface of steel pipes;

[0056] 2. Steel pipe preheating: the temperature of the preheating furnace is 210°C, and the temperature of the steel pipe reaches 170°C;

[0057] 3. After the steel pipe is preheated, spray on the outer surface of the steel pipe step by step

[0058] a. Spray a layer of epoxy resin first, use epoxy resin with a particle size of 100 mesh, control the spraying time per centimeter of pipe within 2-3 seconds, and the thickness of epoxy resin is 0.085mm;

[0059] b. Then spray a layer of hot melt adhesive, using hot melt adhesive with a melting point of 110-120°C, and the thickness of the hot melt adhesive is 0.15mm;

[0060] c. Then spray polyethylene, the thickness of polyethylene is 1mm;

[0061] 4. After spraying the three-layer material, the steel pipe needs to be cured and leveled at a temperature of 210°C for 30min.

[0062] 5. The steel pipe is taken out of the furnace,...

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Abstract

The present invention discloses modern pipe outer anticorrosion spraying method. The pipe outer anticorrosion spraying process includes the following steps: processor-treatment of steel pipe, preheating steel pipe, spraying one layer of thermosol in the thickness of 0.1-0.2 mm, spraying polyethylene layer of 1-5 mm thickness, curing and leveling for 20-35 min, discharging from furnace and cooling. The present invention is suitable for the surface anticorrosion treatment of conveying pipe for petroleum, natural gas, chemical material, etc.

Description

technical field [0001] The invention relates to an anti-corrosion treatment method for pipes, more specifically, relates to a surface anti-corrosion treatment method for pipes used in oil, natural gas, chemical industry and other transportation pipelines. Background technique [0002] At present, it is mainly used in the surface anticorrosion treatment of oil, natural gas, chemical and other pipelines, using the treatment method of winding three layers of polyethylene. Wrapped three-layer structure polyethylene (referred to as: coated 3PE) was first used in Europe and Canada in the 1980s, and then extended to the world. It has been used in China since the mid-1990s. The coated 3PE anti-corrosion layer has good anti-corrosion performance and tough and durable performance. Now the extrusion lateral winding process is usually used. This process has disadvantages: [0003] 1. The combination of three different families of materials presents a risk of delamination [0004] The...

Claims

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Application Information

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IPC IPC(8): F16L58/02F16L58/04
Inventor 左树清
Owner 左树清
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