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Preparation method for nitrite intercalation hydrotalcite material modified reinforcing steel bar epoxy resin coating

An epoxy resin coating and nitrite technology, applied in epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve the problems of reducing the reinforced concrete structure, reducing the bonding performance of the coating, and accelerating the corrosion of steel bars. Improves adhesion, improves compatibility, prevents corrosion

Active Publication Date: 2018-10-16
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nevertheless, epoxy resin coatings often have some small void defects during the coating process, which induces pitting corrosion, and once pitting corrosion occurs, large cathodes and small anodes will be produced, thereby accelerating the corrosion of steel bars and drastically reducing ring corrosion. To improve the durability of epoxy resin coated reinforced concrete structures, at present, in order to improve the performance of epoxy resin coating, modification treatment is often carried out, such as adding nano-Al 2 o 3 , graphene particles, nano-ZnO, etc., but these inorganic fillers are single-functional and can only compact the microstructure; at the same time, there are also problems that reduce the coating due to poor compatibility between inorganic fillers and organic epoxy resins. Adhesive performance issues

Method used

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Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0023] a. Use the carbonate-type hydrotalcite synthesized by the co-precipitation method as the raw material, roast at 480°C for 8 hours to obtain the roasted oxidation product, mix it with sodium nitrite in a molar ratio of 1:2, and add it to the second boiling in distilled water, stirred at 80°C for 3 hours, after centrifugation, washed until the pH value was neutral, and dried in vacuum to obtain the nitrite intercalated hydrotalcite material;

[0024] b. Prepare a mixed solution of absolute ethanol and deionized water at a mass ratio of 1:5, add silane with a mass concentration of 10% to the mixed solution, adjust the pH value to 4 with oxalic acid, and ultrasonically disperse for 30 minutes;

[0025] c. Add the nitrite intercalated hydrotalcite to the silane organic mixed solution at a mass ratio of 1:1 to the silane, and magnetically stir in a water bath at 60°C for 3 hours. After separation, use ethanol and deionized water The mixed solution was washed until the pH was ...

specific Embodiment approach 2

[0030] a. The carbonate-type hydrotalcite prepared by the hydrothermal synthesis method is used as raw material, roasted at 500°C for 6 hours to obtain the roasted oxidation product, which is mixed with sodium nitrite in a molar ratio of 1:3, and added to the second boiling Stir in distilled water at 85°C for 4 hours, after centrifugation, wash until the pH value is neutral, and dry in vacuum to obtain the nitrite intercalated hydrotalcite material;

[0031] b. Prepare a mixed solution of absolute ethanol and deionized water at a mass ratio of 1:8, add silane with a mass concentration of 20% to the mixed solution, adjust the pH value to 4 with oxalic acid, and disperse it ultrasonically for 25 minutes;

[0032] c. Add the nitrite intercalated hydrotalcite to the silane organic mixed solution at a mass ratio of 1:1.5 to the silane, and magnetically stir in a water bath at 70°C for 4 hours. After separation, mix with ethanol and deionized water The solution is washed until the p...

specific Embodiment approach 3

[0037] a. Use commercial or synthetic carbonate-type hydrotalcite as raw material, roast at 520°C for 4 hours to obtain the roasted oxidation product, mix it with sodium nitrite in a molar ratio of 1:4, and add it to the second boiling Stir in distilled water at 90°C for 5 hours, after centrifugation, wash until the pH value is neutral, and dry in vacuum to obtain the nitrite intercalated hydrotalcite material;

[0038] b. Prepare a mixed solution of absolute ethanol and deionized water at a mass ratio of 1:10, add silane with a mass concentration of 30% to the mixed solution, adjust the pH value to 5 with oxalic acid, and disperse it ultrasonically for 20 minutes;

[0039] c. Add the nitrite intercalated hydrotalcite to the silane organic mixed solution at a mass ratio of 1:1.5 to the silane, and stir magnetically in a water bath at 75°C for 5 hours. After separation, mix with ethanol and deionized water The solution is washed until the pH is neutral, and dried in vacuum;

...

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Abstract

The invention discloses a preparation method for a nitrite intercalation hydrotalcite material modified reinforcing steel bar epoxy resin coating. The preparation method is characterized by comprisingthe following steps: adding a nitrite intercalation hydrotalcite material and silane into a silane organic mixed solution at a certain ratio, after water bath magnetic stirring is subjected to separation processing, washing with the mixed solution of ethyl alcohol and deionized water until pH (Potential of Hydrogen) is neutral, and carrying out vacuum drying to obtain a drying object; grinding the drying object to obtain fine powder, adding the fine powder into normal butanol organic solvent, carrying out ultrasonic dispersion to prepare organic solvent dispersion object solution; adding epoxy resin into the organic solvent dispersion object solution to carry out ultrasonic dispersion; adding a polyamide curing agent, carrying out even dispersion, and carrying out vacuum drying. Accordingto the preparation method, the pore structure of the epoxy resin can be compact, and the permeation intrusion of chloridions is hindered to avoid the corrosion of chloridions on reinforcing steel bar. Therefore, the coating material has multifunctionality and intellectuality, and the corrosive protection ability of the epoxy resin coating for the reinforcing steel bar is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of steel bar corrosion protection in concrete, and in particular relates to a nitrite radical intercalation hydrotalcite material modified steel bar epoxy resin coating and a preparation method thereof. Background technique [0002] Chloride ion corrosion of steel bars is the main reason for the decline in the durability of concrete structures and the shortening of service life, which has caused huge damage to the national economy and people's lives. Many domestic marine concrete structure projects have chloride ion corrosion caused by 5-10 years after use. Steel bar corrosion problem, to deal with this problem, epoxy resin coated steel bar is one of the most widely used protective measures, which has the advantages of simplicity, low cost and excellent performance. [0003] Nevertheless, epoxy resin coatings often have some small void defects during the coating process, which induces pitting corrosion, and ...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D5/08
CPCC09D5/08C09D163/00C08K9/02C08K3/26C08K7/00
Inventor 徐金霞梅友静蒋林华谭启平
Owner HOHAI UNIV
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