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Painting process for small-tube-diameter double-polyurethane (2PE) anticorrosive steel tube

A coating process and technology for anti-corrosion steel pipes, which are applied to devices for coating liquid on surfaces, coatings, and pre-treatment surfaces. Inconsistency and other problems, to achieve the effect of meeting market demand, good coating effect and uniform thickness

Inactive Publication Date: 2011-11-16
TIANJIN YUANXIANG IND TRADE
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, for steel pipes with a diameter of less than 500 mm, due to their large length and small diameter, the pipe body is prone to radial vibration during the transportation process, causing the adhesive and polyethylene anti-corrosion layer to be damaged during the lateral winding process. The tightness is inconsistent, reducing the performance of the anti-corrosion coating of the steel pipe

Method used

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Embodiment Construction

[0013] The present invention will be described in further detail below in conjunction with specific examples. The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0014] A small-diameter 2PE anti-corrosion steel pipe coating process, characterized in that: the steps of the coating process are:

[0015] (1). Surface treatment: Use shot blasting machine to derust the surface of the steel pipe. The surface temperature of the steel pipe should be 3°C higher than the dew point, otherwise it should be preheated to eliminate moisture.

[0016] (2). Intermediate frequency heating: use intermediate frequency heating device to heat the steel pipe, the steel pipe surface temperature reaches 185±15℃, the intermediate frequency voltage is 300kv, the intermediate frequency frequency is 970, the intermediate frequency power is 40±10kw, the rectification voltage is 250±10v, the rectification The current is 180A.

[0...

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Abstract

The invention relates to a painting process for a small-tube-diameter double-polyurethane (2PE) anticorrosive steel tube. The painting process comprises the following steps of: (1) performing surface treatment; (2) heating at intermediate frequency; (3) coating an adhesive and polyethylene; and (4) water-cooling. In the painting process, an anticorrosive layer is manufactured by adopting an adhesive and polyethylene extruding and coating process, so that the anticorrosive painting of the small-tube-diameter steel tube can be realized; the painting process has outstanding advantages of simpleness, good painting effect and high efficiency; furthermore, the anticorrosive layer has uniform thickness and higher tensile strength, peel strength, impact strength and bending resistance, so that the market requirement can be met.

Description

technical field [0001] The invention belongs to the field of anti-corrosion steel pipes, in particular to a small-diameter 2PE anti-corrosion steel pipe coating process. Background technique [0002] Anti-corrosion steel pipes are widely used in pipeline engineering fields such as petroleum, chemical, natural gas, heat, sewage treatment, water sources, bridges, and steel structures in my country. 2PE anti-corrosion steel pipe refers to the anti-corrosion steel pipe with two-layer structure of adhesive and polyethylene coated on the surface of the steel pipe. By combining the excellent properties of the two, it can effectively improve the performance of chemical corrosion resistance, cathodic stripping resistance and mechanical damage resistance. It has a wide range of applications. . At present, the production method of 2PE anti-corrosion steel pipe is: laterally wind the adhesive on the surface of the steel pipe, and laterally wind the polyethylene anti-corrosion layer. D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/34B05D3/00B05C5/00
Inventor 赵永远
Owner TIANJIN YUANXIANG IND TRADE
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