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Zeolite-like zinc-based imidazolate metal organic framework steel bar corrosion inhibitor as well as preparation method and application thereof

A metal-organic framework and zinc-based imidazolate technology, which is applied in the field of reinforced concrete rust inhibitors, can solve the problems of low efficiency of rust inhibition, performance toxicity of concrete materials, etc.

Active Publication Date: 2021-04-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the problems that the existing reinforced concrete rust inhibitors have low rust inhibition efficiency, negative impact on the performance of concrete materials and certain toxicity, the purpose of the present invention is to provide a zeolite-like zinc-based imidazolate metal-organic framework (MOFs type) Steel bar rust inhibitor and its preparation method and application, using zeolite zinc-based imidazolate MOFs as the main material, using zeolite zinc-based imidazolate structure stable, strong hydrophobicity, environmentally friendly and harmless, and containing a large number of π electron systems and other strong adsorption sites It can play an efficient anti-rust effect on steel bars in concrete

Method used

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  • Zeolite-like zinc-based imidazolate metal organic framework steel bar corrosion inhibitor as well as preparation method and application thereof
  • Zeolite-like zinc-based imidazolate metal organic framework steel bar corrosion inhibitor as well as preparation method and application thereof
  • Zeolite-like zinc-based imidazolate metal organic framework steel bar corrosion inhibitor as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In two beakers, 5.95g zinc nitrate was dissolved in 46ml deionized water, 114.8g 2-methylimidazole was dissolved in 400mL deionized water, then the zinc nitrate solution was dripped into the 2-methylimidazole solution drop by drop, and Continue to stir and react at 25°C for 24 hours, then place the above mixed solution in a high-speed centrifuge and centrifuge at 10,000rpm for 10 minutes, and finally wash the product 3 times with the corresponding solvent and dry it in a vacuum oven at 105°C for 8 hours. After taking it out, it is fully ground to obtain a powdery zeolite zinc-based imidazolate MOFs rust inhibitor.

[0035] figure 1 The scanning electron microscope morphology of the zeolite zinc-based imidazolate MOFs steel bar rust inhibitor prepared according to the above steps, and its particle size ranges from 80 to 120 nm.

[0036] Performance evaluation of rust inhibitor:

[0037] The present invention adopts the AC impedance spectrum electrochemical method to ca...

Embodiment 2

[0044] In this embodiment, except for the following features, all the other features are the same as in Embodiment 1;

[0045] During the preparation of zeolite zinc-based imidazolate MOFs rust inhibitor, the molar ratio of zinc ions to 2-nitroimidazole satisfies 1:60; before the reaction starts, the concentration of zinc ions in the solution system is controlled to be 0.05mol / L; After mixing, the stirring reaction was continued for 25 hours.

[0046] The test result of this embodiment is similar to that of embodiment 1.

Embodiment 3

[0048] In this embodiment, except the following features, all the other features are the same as in Embodiment 1;

[0049] During the preparation process of zeolite zinc-based imidazolate MOFs rust inhibitor, the molar ratio of zinc ions to 2-formyl imidazole satisfies 1:80; before the reaction starts, the concentration of zinc ions in the solution system is controlled to be 0.04mol / L; After mixing, the stirring reaction was continued for 23 hours.

[0050] The test result of this embodiment is similar to that of embodiment 1.

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Abstract

The invention belongs to the field of steel bar corrosion inhibitors for concrete engineering, and discloses a zeolite-like zinc-based imidazolate metal organic framework steel bar corrosion inhibitor, and a preparation method and an application thereof. Zinc ions are adopted as metal nodes, and are subjected to coordination self-assembly with imidazole organic ligands to form the zeolite-like zinc-based imidazolate steel bar corrosion inhibitor, wherein the structural formula of the zeolite-like zinc-based imidazolate MOFs is shown in the specification, and R is one of methyl, nitro and formyl. According to the invention, the zeolite-like zinc-based imidazolate MOFs have the advantages of high chemical stability, strong adsorption effect on the surface of the steel bar, high hydrophobicity after adsorption and film formation and the like under the high-alkalinity condition of concrete, and play a role in efficiently inhibiting corrosion of the steel bar in the concrete.

Description

technical field [0001] The invention belongs to the field of rust inhibitors for reinforced concrete, and more specifically relates to a zeolite-like zinc-based imidazolate metal-organic frame steel rust inhibitor, a preparation method and an application. Background technique [0002] Reinforced concrete is widely used in the field of construction engineering, but when the external corrosive medium (especially chloride ion) penetrates into the surface of the steel bar through the porous structure of the concrete and accumulates, it will cause corrosion damage to the steel bar in the concrete, and the accumulation of corrosion products can further Cause concrete cracking and spalling, thereby seriously reducing the durability of reinforced concrete structures. The addition of organic steel rust inhibitors in fresh concrete is considered to be the most cost-effective and operable technical means to inhibit the corrosion of steel bars in concrete, and has been widely used in th...

Claims

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Application Information

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IPC IPC(8): C08G83/00C04B24/40C04B103/61
Inventor 胡捷王羊洋黄锦圳张漳敏马玉玮黄浩良韦江雄余其俊
Owner SOUTH CHINA UNIV OF TECH
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