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Corrosion-resistant polyurea coating for pipeline repair and preparation method of corrosion-resistant polyurea coating

A pipeline repair and corrosion-resistant technology, applied in polyurea/polyurethane coatings, anti-corrosion coatings, epoxy resin coatings, etc., can solve problems such as complex service environments, harsh conditions, and corrosion of pipelines, so as to increase complexity and prolong service life , Excellent corrosion resistance effect

Active Publication Date: 2022-07-01
上海予通管道工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The external repair of the existing pipeline repair includes the use of paint protection to prevent corrosion, and the service environment of the pipeline is relatively complicated and the conditions are harsh. The existing anti-corrosion coating cannot guarantee the long-term effectiveness of the anti-corrosion layer
At present, three-layer radiation cross-linked polyethylene with epoxy primer is mostly used as the joint anti-corrosion layer of new pipelines, but there will be different degrees of water accumulation and corrosion; therefore, excellent anti-corrosion effect and anti-corrosion Long-term anti-corrosion coatings are particularly important

Method used

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  • Corrosion-resistant polyurea coating for pipeline repair and preparation method of corrosion-resistant polyurea coating
  • Corrosion-resistant polyurea coating for pipeline repair and preparation method of corrosion-resistant polyurea coating

Examples

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Effect test

Embodiment 1

[0042] (1) Under the protection of nitrogen, mix the modified polyurea elastomer and aromatic oil, stir for 10 minutes, and add epoxy resin; continue to stir for 1 hour and vacuumize for 2 hours to obtain component A of the prepolymer;

[0043] (2) Under the protection of nitrogen, put the white carbon black and anti-aging agent into a ball mill, ball mill for 30 minutes, then divide into 3 parts and add them in batches, then ultrasonically stir for 10 minutes, add composite fumed silica, stir for 1 hour, and heat up to 55 ℃ of reaction for 30min, vacuumed for 2h, to obtain prepolymer B component; mix prepolymer A component and prepolymer B component to obtain a corrosion-resistant polyurea coating for pipeline repair;

[0044] The vacuum pressure is -0.088MPa, and the vacuum temperature is 90℃;

[0045] In parts by weight, the content of each component in the corrosion-resistant polyurea coating is: 36 parts of modified polyurea elastomer, 8 parts of epoxy resin, 5 parts of a...

Embodiment 2

[0053] (1) Under nitrogen protection, mix the modified polyurea elastomer and aromatic oil, stir for 15 minutes, add epoxy resin; continue to stir and react for 1.5 hours, and vacuumize for 2.5 hours to obtain component A of the prepolymer;

[0054] (2) Under the protection of nitrogen, put the white carbon black and anti-aging agent into a ball mill, ball mill for 30 minutes, then divide into 4 parts and add them in batches, then ultrasonically stir for 10 minutes, add composite fumed silica, stir for 1.2 hours, and heat up to Reaction at 70°C for 35 minutes, vacuuming for 2.5 hours, to obtain prepolymer B component; mixing prepolymer A component and prepolymer B component to obtain a corrosion-resistant polyurea coating for pipeline repair;

[0055] The vacuum pressure is -0.09MPa, and the vacuum temperature is 95℃;

[0056] In parts by weight, the content of each component in the corrosion-resistant polyurea coating is: 40 parts of modified polyurea elastomer, 12 parts of e...

Embodiment 3

[0064] (1) Under the protection of nitrogen, mix the modified polyurea elastomer and aromatic oil, stir for 20min, add epoxy resin; continue to stir for 2h, vacuumize for 3h, and obtain prepolymer A component;

[0065] (2) Under the protection of nitrogen, put the white carbon black and anti-aging agent into a ball mill for 30 minutes, then divide into 5 parts and add them in batches, then ultrasonically stir for 10 minutes, add composite fumed silica, stir for 2 hours, and heat up to 75 ℃ of reaction for 40min, vacuumed for 3h, to obtain the prepolymer B component; mix the prepolymer A component and the prepolymer B component to obtain a corrosion-resistant polyurea coating for pipeline repair;

[0066] The vacuum pressure is -0.096MPa, and the vacuum temperature is 98℃;

[0067] In parts by weight, the content of each component in the corrosion-resistant polyurea coating is: 42 parts of modified polyurea elastomer, 18 parts of epoxy resin, 10 parts of aromatic oil, 6 parts o...

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Abstract

According to the corrosion-resistant polyurea coating for pipeline repair and the preparation method of the corrosion-resistant polyurea coating, by limiting components in the polyurea coating and a mixing process, a complex cross-linked network structure is constructed in a coating formed by the coating, and it is guaranteed that the prepared corrosion-resistant polyurea coating has excellent corrosion resistance and self-healing performance; the service life of the polyurea coating is prolonged; the modified polyurea elastomer with self-repairing performance is self-made, so that the corrosion resistance, the thermal stability, the oxidation resistance, the high air permeability and the insulativity of the coating are improved; the molar ratio of the sum of the moles of the modified polyurea elastomer in the polyurea coating and the isocyanate group in the composite fumed silica to the molar ratio of the modified polyurea elastomer to the amino group in the anti-aging agent is limited, so that the wettability of the coating to a base material is improved, and the adhesive force to the base material is improved; the fumed silica is modified, and the white carbon black and the composite fumed silica are adopted to fill and modify the polyurea elastomer and the epoxy resin matrix, so that the toughness and apparent density of the polyurea coating are improved.

Description

technical field [0001] The invention relates to the technical field of pipeline repair, in particular to a corrosion-resistant polyurea coating for pipeline repair and a preparation method thereof. Background technique [0002] Pipelines that have been in operation for many years will cause various damages or even leaks due to corrosion, poor management and other reasons, and there will be serious economic losses. However, replacing new pipelines requires a huge amount of engineering, high cost and long construction period. Therefore, how to ensure the safe operation of pipelines for a long time has received great attention. [0003] Pipeline repair includes internal and external anti-corrosion repair, which is to detect, evaluate and repair the external anti-corrosion layer of the pipeline; internal repair is to fully impregnate the fiber hose with an impermeable membrane with resin, and then use air pressure or water pressure to turn it over and stick to the old one. On t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/02C09D163/00C09D7/62C09D7/61C09D5/08C09D5/25C09D7/63
CPCC09D175/02C09D7/62C09D7/61C09D5/08C09D5/00C09D7/63C08L2201/08C08L2203/18C08L63/00C08K9/04C08K3/36C08K7/26C08K5/20
Inventor 刘霞裴仕兵仝志强
Owner 上海予通管道工程技术有限公司