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Cu-MBT and HNTs self-healing epoxy coating and preparation method thereof

An epoxy coating, self-healing technology, applied in the field of coating anti-corrosion, can solve problems such as coating failure

Pending Publication Date: 2022-03-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a Cu-MBT@HNTs self-healing epoxy coating and its preparation method, aiming at the problem that the coating is prone to failure due to local damage, according to 2-mercaptobenzo Thiazole (MBT) and Cu 2+ The coordination between the corrosion inhibitor MBT is encapsulated in HNTs and sealed with copper ions, and then added to epoxy resin to be coated on the Q235 steel substrate to prepare a corrosion inhibitor that can be applied in the marine environment Cu-MBT@HNTs self-healing epoxy coating, in order to enable the coating to release corrosion inhibitors to protect the metal substrate under the condition of micro damage

Method used

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  • Cu-MBT and HNTs self-healing epoxy coating and preparation method thereof
  • Cu-MBT and HNTs self-healing epoxy coating and preparation method thereof
  • Cu-MBT and HNTs self-healing epoxy coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Dissolve MBT in 50ml ethanol at a concentration of 5g / L and stir until dissolved to obtain a mother liquor, add 0.5g of HNTs to it, and ultrasonicate for 5min to obtain a suspension.

[0031] (2) The suspension was placed in a vacuum tank, and the MBT was loaded into the lumen of the HNTs by negative pressure. A total of 4 cycles are required for vacuuming: evacuate to make the absolute vacuum inside the container reach 10KPa, and keep the internal pressure static for 90 minutes; open the valve to return the interior to atmospheric pressure, and complete a loading cycle. After loading, it was centrifuged and washed twice with deionized water, and the centrifuge tube was placed in a drying oven at 60°C for 24 hours; the dried sample was ground into powder to obtain the MBT@HNTs composite corrosion inhibitor.

[0032] (3) Add MBT@HNTs to 40ml of CuSO with a molar concentration of 4mmol / L 4 aqueous solution, stirred for 5 minutes. After that, the sample was taken out...

Embodiment 2

[0036] (1) Dissolve MBT in 50ml ethanol at a concentration of 15g / L and stir until dissolved to obtain a mother liquor, add 1g of HNTs to it, and ultrasonicate for 15min to obtain a suspension.

[0037] (2) The suspension was placed in a vacuum tank, and the MBT was loaded into the lumen of the HNTs by negative pressure. Vacuuming requires 3 cycles in total: evacuating to make the absolute vacuum inside the container reach 8KPa, and keeping the internal pressure static for 60 minutes; opening the valve to return the interior to atmospheric pressure to complete a loading cycle. After loading, it was centrifuged and washed with deionized water for 4 times, and the centrifuge tube was placed in a drying oven at 60°C for 24 hours; the dried sample was ground into powder to obtain the MBT@HNTs composite corrosion inhibitor.

[0038] (3) Add MBT@HNTs to 40ml of CuSO with a molar concentration of 10mmol / L 4 aqueous solution, stirred for 3 minutes. After that, the sample was taken o...

Embodiment 3

[0041] (1) Dissolve MBT in 50ml ethanol at a concentration of 30g / L and stir until dissolved to obtain a mother liquor, add 1.5g of HNTs to it, and ultrasonicate for 25min to obtain a suspension.

[0042] (2) The suspension was placed in a vacuum tank, and the MBT was loaded into the lumen of the HNTs by negative pressure. A total of 5 cycles are required for vacuuming: vacuumize to make the absolute vacuum inside the container reach 6KPa, and keep the internal pressure static for 100 minutes; open the valve to return the interior to atmospheric pressure, and complete a loading cycle. After loading, it was centrifuged and washed with deionized water for 6 times, and the centrifuge tube was placed in a drying oven at 60°C for 24 hours; the dried sample was ground into powder to obtain the MBT@HNTs composite corrosion inhibitor.

[0043] (3) Add MBT@HNTs to 40ml of CuSO with a molar concentration of 20mmol / L 4 aqueous solution, stirred for 2 minutes. After that, the sample was...

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Abstract

The invention discloses a Cu-MBT-coated HNTs self-healing epoxy coating and a preparation method thereof, according to coordination between 2-mercaptobenzothiazole (MBT) and Cu < 2 + >, a corrosion inhibitor MBT is packaged in HNTs, sealing treatment is performed through copper ions, then the corrosion inhibitor MBT is added into epoxy resin to coat a Q235 steel matrix, and the Cu-MBT-coated HNTs self-healing epoxy coating which can be applied to a marine environment is prepared. The Cu-MBT coated HNTs obtained by the preparation method disclosed by the invention can be used for slowly and controllably releasing MBT; and in addition, the obtained Cu-MBT and HNTs self-healing epoxy coating can show excellent corrosion resistance and self-healing performance under the condition that the Cu-MBT and HNTs self-healing epoxy coating is damaged.

Description

technical field [0001] The invention belongs to the technical field of coating anticorrosion, and relates to a method for preparing a self-healing coating applied to marine structures and ships, specifically adding a composite corrosion inhibitor that can be released in response to pH changes into epoxy resin , so that the coating has self-healing ability when micro damage occurs. Background technique [0002] Metal components such as offshore structural devices, ocean transportation ships, and oil and gas transmission pipelines are exposed to strong corrosive electrolyte seawater, and their service life is seriously affected by corrosion. The annual loss due to marine corrosion accounts for about 5% of the country's GDP. Taking effective measures to reduce losses caused by marine corrosion is an important link in the process of marine development. Among them, the intelligent self-healing coating is to add nano-containers loaded with corrosion inhibitors to the coating. Wh...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D5/08C09D7/63C09D7/61C23F11/08
CPCC09D163/00C09D5/08C09D7/63C09D7/61C23F11/08C08K2201/011C08K9/12C08K5/0091C08K5/47C08K7/26
Inventor 王吉会薛菲胡文彬
Owner TIANJIN UNIV
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