Repairing process for coating damage of three-layer polyolefin coating exposed base material

A polyolefin and coating technology, which is applied in coatings, devices for coating liquids on surfaces, pretreatment of surfaces, etc., can solve problems such as waste of costs and resources, and damage to exposed substrates

Active Publication Date: 2020-02-04
SHANGHAI HILONG ANTI CORROSION TECH ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The defect repair of three-layer polyolefin (such as: polyethylene, polypropylene) anti-corrosion coating is an important indicator of coating quality, but the traditional repair process can only repair the damage of the non-exposed substrate, but the coating During the hoisting, transportation, and construction of steel pipes, damage to the exposed base material will inevitably occur. The usual practice is to either peel off the entire steel pipe and recoat it, or cut and discard the damaged section, resulting in waste of cost and resources.

Method used

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  • Repairing process for coating damage of three-layer polyolefin coating exposed base material

Examples

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Effect test

Embodiment 1

[0031] see figure 1 , embodiment 1 discloses a kind of repairing process of the coating damage of three-layer polyethylene coating exposed base material. As shown in the figure: it includes the following steps:

[0032] a) Temperature and humidity control. Measure the surface temperature of the substrate, ambient temperature, and relative humidity and calculate the dew point temperature. It is carried out when the surface temperature of the substrate is 3°C higher than the dew point temperature. If the surface is lower than 10°C, it should be preheated before repairing. If the surface temperature of the substrate is 3°C lower than the dew point temperature, there may be condensed water on the substrate and other conditions that are not conducive to repairing. If the surface of the substrate is lower than 10°C, the curing of the repair material and the bonding force with the substrate will be adversely affected. .

[0033] b) Preliminary cleaning of the damaged area. Clean ...

Embodiment 2

[0045] Embodiment 2 discloses a repairing process for coating damage of a three-layer polypropylene coating exposed substrate. It includes the following steps:

[0046]A) Temperature and humidity control. Measure the surface temperature of the substrate, ambient temperature, and relative humidity and calculate the dew point temperature. It is carried out when the surface temperature of the substrate is 3°C higher than the dew point temperature. If the surface is lower than 10°C, it should be preheated before repairing. If the surface temperature of the substrate is 3°C lower than the dew point temperature, there may be condensed water on the substrate and other conditions that are not conducive to repairing. If the surface of the substrate is lower than 10°C, the curing of the repair material and the bonding force with the substrate will be adversely affected. .

[0047] B) Initial cleaning of the damaged area. Clean and remove the damaged polypropylene coating in the defec...

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Abstract

The invention relates to a repairing process for coating damage of a three-layer polyolefin coating exposed base material. The repairing process comprises the following steps: step 1, controlling temperature and humidity; step 2, primarily cleaning a damaged region; step 3, carrying out lap joint treatment; step 4, treating the base material; step 5, carrying out cross filing treatment; step 6, preheating the surface; step 7, selecting a liquid-state double-component repairing material which is recommended by the same manufacturer as a mother coating bottom layer material; step 8, carrying outblade coating on a bottom layer coating; step 9, gelling a coating; step 10, gelling a window; step 11, repairing by an adhesive; and step 12, repairing polyolefin. The process is used for carrying out corresponding repairing construction and detection, and the quality of the repaired coating can meet related quality requirements of the corresponding coating. Meanwhile, the process greatly avoidsa phenomenon that a coating pipe is peeled and remade as the coating pipe is damaged to the base material; and meanwhile, the construction cost is reduced and resources are saved.

Description

technical field [0001] The invention relates to a coating repair process, in particular to a three-layer polyolefin coating exposed substrate coating damage repair process. Background technique [0002] At the end of the 1990s and the beginning of this century, the anti-corrosion technology of steel pipelines was introduced into my country from abroad. Especially in recent years, with the rapid development of the domestic energy industry, the technology and production process of anti-corrosion coatings have gradually improved. [0003] Especially in the past ten years, the widespread application of three-layer structure polyolefin coating has accumulated rich experience for the production technology and construction process of polyolefin coating, and it has also been gradually improved. At the same time, the quality requirements of various customers or industries for coatings are also increasing year by year, and high-quality polyolefin coatings are the unanimous goal pursu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/28B05D3/00B05D5/00B05D1/38B05D7/24
CPCB05D5/005B05D3/002B05D7/24B05D1/28B05D3/007B05D7/58
Inventor 谢挺廖青云尉迟浩卫亮杨勤祥邓广武李欣钰
Owner SHANGHAI HILONG ANTI CORROSION TECH ENG
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