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Technology for coating three-layer polyethylene structure on outer wall and fusing epoxy resin on inner wall of steel pipe

A technology of steel pipe inner wall and epoxy resin, applied in the direction of coating, liquid coating device on the surface, etc., can solve the problems of low processing efficiency, inability to resist acid and alkali, and high equipment cost, so as to reduce the power consumption of transmission and ensure the surface Effect of leveling, good corrosion protection properties

Active Publication Date: 2012-12-26
WEIFANG EAST PIPE IND TECHNICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, all steel pipes are coated with epoxy resin inside and outside. The coating process includes hot dip coating and spray coating. The hot dip coating process has the disadvantages of uneven wall hanging and poor adhesion. There are two processes of spraying the inner wall of the pipe. The steel pipe is heated once to spray the outer wall and then leveled and solidified. Then the steel pipe is heated twice to spray the inner wall of the pipe and finally thermally cured. The resin coating will sag when it is heated for the second time, resulting in uneven coating, and the processing efficiency of this method is low, and the equipment cost is high. Disadvantages of poor mechanical shock resistance

Method used

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  • Technology for coating three-layer polyethylene structure on outer wall and fusing epoxy resin on inner wall of steel pipe
  • Technology for coating three-layer polyethylene structure on outer wall and fusing epoxy resin on inner wall of steel pipe
  • Technology for coating three-layer polyethylene structure on outer wall and fusing epoxy resin on inner wall of steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A process for coating the inner wall of a steel pipe with an epoxy resin outer wall with a three-layer polyethylene structure, comprising the following steps:

[0026] In the first step, after the steel pipe is shot blasted on the inner and outer walls by the shot blasting machine, the inner and outer walls of the steel pipe after the shot blasting treatment are measured by the anchor grain meter to have an anchor grain depth of 50um, and are transported by the conveying device, which drives the steel pipe to wind around itself The axis rotates and advances. The pitch of the steel pipe when it rotates forward is between 80mm. After the steel pipe passes through the intermediate frequency induction furnace and is heated, the temperature of the steel pipe after heating is controlled between 130°C, and the inner wall powder spraying vehicle is started to drive the spraying at the front of the spray gun. The head extends into the front end of the steel pipe, the conveying de...

Embodiment 2

[0031] A process for coating the inner wall of a steel pipe with an epoxy resin outer wall with a three-layer polyethylene structure, comprising the following steps:

[0032] In the first step, after the steel pipe is shot blasted on the inner and outer walls by the shot blasting machine, the inner and outer walls of the steel pipe after the shot blasting treatment are measured by the anchor grain meter as the anchor grain depth of 70um, and are transported by the conveying device, which drives the steel pipe to wind around itself The axis rotates and advances. The pitch of the steel pipe when it rotates forward is between 100mm. After the steel pipe passes through the intermediate frequency induction furnace and is heated, the temperature of the steel pipe after heating is controlled between 160°C, and the inner wall powder spraying vehicle is started to drive the spray at the front of the spray gun. The head extends into the front end of the steel pipe, the conveying device c...

Embodiment 3

[0037] A process for coating the inner wall of a steel pipe with an epoxy resin outer wall with a three-layer polyethylene structure, comprising the following steps:

[0038] In the first step, after the steel pipe is shot blasted on the inner and outer walls by the shot blasting machine, the inner and outer walls of the steel pipe after the shot blasting treatment are measured by the anchor texture meter. The depth of the anchor pattern is 60um. The axis rotates and advances. The pitch of the steel pipe when it rotates forward is between 90mm. After the steel pipe passes through the intermediate frequency induction furnace and is heated, the temperature of the steel pipe after heating is controlled between 150°C, and the inner wall powder spraying vehicle is started to drive the spray at the front end of the spray gun. The head extends into the front end of the steel pipe, the conveying device continues to drive the steel pipe to rotate forward, start the spray gun, and the sp...

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Abstract

The invention relates to a technology for coating a three-layer polyethylene structure on an outer wall and fusing an epoxy resin on an inner wall of a steel pipe. The technology comprises the following steps: performing shot-blasting treatment on the inner and outer walls of the steel pipe by using a shot-blasting machine, and then conveying the steel pipe by a conveying device; inserting the steel pipe into an intermediate-frequency induction furnace and heating, and then inserting a spray head at the front end of a spray gun into an inner front end of the steel pipe and spraying epoxy resin powder on the inner wall of the steel pipe; secondarily heating the advancing steel pipe; causing the steel pipe to continuously pass by an outer wall powder-spraying trolley, an adhesive winding machine and a polyethylene winding machine in turn; spraying the epoxy resin powder through the spray gun on the outer wall powder-spraying trolley; winding an adhesive film on the outer wall of the steel pipe through the adhesive winding machine; winding a polyethylene belt on the outer wall of the steel pipe through the polyethylene winding machine; conveying the steel pipe wound with the polyethylene belt by the conveying device; and utilizing the waste heat of the steel pipe to flow evenly and solidify. The inner wall of the steel pipe manufactured by utilizing the technology has excellent anti-corrosion property for resisting acid-base salts and the outer wall has characteristics of excellent corrosion resistance, acid-base resistance, ageing resistance and mechanical shock resistance.

Description

technical field [0001] The invention relates to a process method for coating the inner wall of a steel pipe with fusion-bonded epoxy resin and the outer wall with a three-layer polyethylene structure (inner epoxy and outer 3PE) in the field of metal processing and material transportation. Background technique [0002] During the use of steel pipes used to transport water bodies (drinking water, industrial water or sea water), their inner walls are eroded by electrolytes and other corrosive substances in the water, and the iron matrix is ​​corroded and peeled off, which greatly shortens the service life, and even scales to block the pipes At the same time, it will cause secondary pollution to drinking water; steel pipes are often buried in construction, forming a corrosion primary battery in the soil environment, electrochemical corrosion will cause perforation and leakage of steel pipes, and at the same time, under different geological conditions, gravel, etc. cause mechanic...

Claims

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Application Information

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IPC IPC(8): B29C63/06B29C63/48B05D7/22B05D7/14
Inventor 丛悦增桑洪涛赵明印丛佃坤孙向东
Owner WEIFANG EAST PIPE IND TECHNICAL CO LTD
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