Ductile iron pipe with anti-corrosion inner coating and its production process

A technology for ductile iron pipes and inner coatings, applied in anti-corrosion coatings, coatings, fire-resistant coatings, etc., can solve the problems that epoxy coatings cannot meet the anti-corrosion and wear resistance, and achieve energy saving and frictional resistance reduction , the effect of increasing the crosslink density

Active Publication Date: 2021-06-01
XINXING DUCTILE IRON PIPES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the current epoxy coating cannot meet the higher requirements of corrosion resistance and wear resistance.

Method used

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  • Ductile iron pipe with anti-corrosion inner coating and its production process
  • Ductile iron pipe with anti-corrosion inner coating and its production process
  • Ductile iron pipe with anti-corrosion inner coating and its production process

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0066] The ductile iron pipe used in the epoxy ceramic coating anti-corrosion inner coating of the water pipeline is prepared by the following method. The preparation method comprises the following steps:

[0067] (1) Internal grinding of ductile iron pipe;

[0068] (2) Sand blast or shot blast the inner wall of the ductile iron pipe to make the roughness Rz≥60μm;

[0069] (3) Preheating, so that the temperature of the ductile iron pipe is between 30°C and 70°C;

[0070] (4) For the repair of defects such as slag pits on the inner wall, use the high-performance epoxy ceramic coating used, add an appropriate amount of ceramic powder, and adjust to an appropriate viscosity to repair surface defects;

[0071] (5) The pipe rotates at a certain speed, and the rotational speed is a linear speed ≥ 250m / min;

[0072] (6) The high-performance phenolic epoxy ceramic coating has a high viscosity at room temperature and must be preheated: both components A and B need to be preheated to...

Embodiment 1

[0082] According to the method of the preparation example, the coating materials given below were prepared and coated, and the effects were compared after coating. Coating materials different from the coating materials given in the present invention can be prepared according to methods similar to the present invention according to conventional techniques in the art.

[0083] Table 1

[0084]

[0085]

Embodiment 2

[0088] Table 2

[0089]

[0090]

[0091]

[0092] What comparative examples 3 and 4 use is the coating that conventionally uses ceramic powder in the prior art. But it can be seen that the conventionally used ceramic powder has a large inconvenient operability in the preparation process, and the existing ceramic powder calcium carbonate is easy to react with other substances (such as acidic substances), and is not resistant to the erosion of strong corrosive media. Can affect the acid resistance and water resistance of coating; Talcum powder, calcium carbonate are relatively low in hardness to the high-purity ceramic powder material required by the present invention, so they are obviously weaker than the coating used in the present invention aspect mechanical properties and chemical resistance.

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Abstract

The invention discloses a ductile iron pipe with an anti-corrosion inner coating and a production process thereof. The inner wall of the ductile iron pipe is coated with an epoxy coating layer, and the coating used in the epoxy coating layer is a solvent-free phenolic epoxy ceramic coating. The volume solid content of the solvent-free novolac epoxy ceramic coating is ≥98%, preferably ≥99%. By coating the epoxy ceramic coating layer of the present invention on the inner wall of the ductile iron pipe, it has excellent high temperature resistance, corrosion resistance, wear resistance, and smooth surface, which can reduce the frictional resistance between water and the pipe wall, thereby ensuring pipeline Long service life.

Description

technical field [0001] The invention relates to the technical field of ductile iron pipes, in particular to a ductile iron pipe with a high-performance epoxy ceramic anti-corrosion inner coating applied to water pipelines. Background technique [0002] Ductile iron pipe has the advantages of good mechanical properties, high interface reliability, good corrosion resistance, long service life, etc., and is currently widely used in industrial fields such as urban construction water transportation and gas transportation. The existing standard internal anti-corrosion coating is cement mortar lining, which has good economical and active anti-corrosion effects. However, due to the inherent alkaline characteristics of cement mortar, the pH value of the water quality will increase at the initial stage of water delivery. In addition, the more corrosive soft water will also be more corrosive to this inner coating. [0003] For this reason, the ductile iron pipe industry has also devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L58/14F16L58/10C09D5/08C09D163/00C09D7/61
CPCC08K2003/2227C08K2003/2241C08L2201/08C08L2203/18C08L2205/025C09D5/08C09D5/18C09D163/00C09D7/61F16L58/1009F16L58/14C08L63/00C08K3/36C08K3/22B05D7/22F16L58/02F16L58/10
Inventor 李宁李军申勇岳江峰贾淸波王颖王志强申艳英马宗勇车蕾
Owner XINXING DUCTILE IRON PIPES CO LTD
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