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Superhydrophobic self-healing intelligent nano-coating and preparation method thereof

A nano-coating and self-healing technology, applied in coatings, anti-corrosion coatings, etc., can solve the problems that corrosion inhibitors cannot be effectively encapsulated, cannot respond to changes in corrosive environment, and affect the sensitivity of metal corrosion, achieve good application prospects, prevent Corrosion, high sensitivity effect

Inactive Publication Date: 2016-04-27
NANJING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the application principle of the supramolecular valve opened for pH change is: metal corrosion produces dissolution, so that when the metal element is oxidized, it is converted into metal ions and dissolved in the liquid environment, and the metal ions undergo hydrolysis reaction again to make the pH value of the liquid environment change. changes, so using pH as a stimulus affects the sensitivity of the metal corrosion process response
Chinese patent application 201510389983.7 doped mesoporous nano-silica with L-histidine adsorbed in the epoxy resin coating, and L-histidine can protect the corrosion area as a corrosion inhibitor. This coating exists The shortcomings of being unable to respond to changes in the corrosive environment and that the corrosion inhibitor cannot be effectively packaged will leak in advance
[0004] An urgent problem to be solved for intelligent anti-corrosion coatings is how to prolong the service life of the coating. At present, there are other products with super-hydrophobic function on the market, such as super-hydrophobic glass, which can prevent the aqueous liquid from staying on the glass surface stably

Method used

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  • Superhydrophobic self-healing intelligent nano-coating and preparation method thereof
  • Superhydrophobic self-healing intelligent nano-coating and preparation method thereof
  • Superhydrophobic self-healing intelligent nano-coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Preparation of sol-gel self-assembled nanoparticle coating

[0037] Mix 26.9mL of 3-glycidyl ether propyltrimethoxysilane with 9.08mL of ethyl orthosilicate, then slowly add 12.8mL of 0.05M acetic acid aqueous solution dropwise thereto, stir for three hours and then let stand for two days.

[0038] 2. Preparation of functionalized mesoporous nano-silica particles

[0039] Dissolve 0.4g NaOH solid in 5mL deionized water, and the concentration is 2mol L -1 Mix 3.5 mL of NaOH solution with 1 g of cetyltrimethylammonium bromide (CTAB) and 480 mL of deionized water, heat the reaction system to 80°C at a speed of 500 rpm, and keep it warm for 30 minutes for activation. Measure 5mL tetraethyl orthosilicate (TEOS) for injection and add it dropwise to the system, complete the addition in 30 minutes, and react at 80°C for 2 hours. After the reaction was completed, it was filtered while it was hot, the product was fully washed with heated deionized water, and vacuum-dried at ...

Embodiment 2

[0055] 1. Preparation of sol-gel self-assembled nanoparticle coating

[0056] 40.44 mL of zirconium n-propoxide was mixed with 13.7 mL of tetraethyl orthosilicate, and then 19.4 mL of 0.05 M acetic acid aqueous solution was slowly added dropwise thereto, stirred for four hours and then allowed to stand for sixty hours.

[0057] 2. Preparation of functionalized mesoporous nano-silica particles

[0058] Dissolve 0.4g NaOH solid in 5mL deionized water, and the concentration is 2mol L -1 Mix 3.5 mL of NaOH solution with 1 g of cetyltrimethylammonium bromide (CTAB) and 480 mL of deionized water, heat the reaction system to 80°C at a speed of 500 rpm, and keep it warm for 30 minutes for activation. Measure 5mL tetraethyl orthosilicate (TEOS) for injection and add it dropwise to the system, complete the addition in 30 minutes, and react at 80°C for 2 hours. After the reaction was completed, it was filtered while it was hot, the product was fully washed with heated deionized water, ...

Embodiment 3

[0069] 1. Preparation of sol-gel self-assembled nanoparticle gels

[0070] Mix 40.44mL of 3-glycidyl ether propyl trimethoxysilane with 13.7mL of ethyl orthosilicate, then slowly add 19.4mL of 0.05M acetic acid aqueous solution dropwise therein, stir for five hours and then let stand for three days.

[0071] 2. Preparation of coatings without functionalized mesoporous nano-silica particles:

[0072] To 8 mL of the aged gel was added 1.14 mL of the crosslinker triethylenetetramine. Select AZ91D magnesium alloy, degrease with acetone, polish with 1500-grit sandpaper in turn, wash with ethanol and dry, hang and immerse in the above gel at a speed of 1.2cm / min, soak for 2min, and then pull it up at a speed of 1.2cm / min. Dry at 100°C for two hours. Label this coating sample as Coating No. 1.

[0073] 3. Preparation of coatings doped with functionalized mesoporous nano-silica particles

[0074] Dissolve 0.4g NaOH solid in 5mL deionized water, and the concentration is 2mol L -1 ...

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Abstract

The invention discloses a superhydrophobic self-healing intelligent nano-coating and a preparation method thereof. According to the intelligent nano-coating, a sol-gel self-assembly nanoparticle coating is adopted as a framework; functionalized nano-grade silica particles are doped in the coating; magnesium alloy corrosion inhibitor molecules paeonol are loaded in the functionalized nano-grade silica particles; a superhydrophobic fluorine-containing monomolecular film layer is modified on the surface of the particles. With the superhydrophobic characteristic, the coating has a good waterproof performance, and assists in inhibiting corrosive medium penetration. The intelligent nano-coating layer can sense the pH change and magnesium ion existence when the magnesium alloy micro-area corrosion occurs, and can rapidly release the magnesium alloy corrosion inhibitor paeonol. The paeonol molecules can form a layer of dense film adhering to the damaged magnesium alloy surface and inhibiting corrosion spreading. Therefore, a function of actively protecting the magnesium alloy is realized. Further, the superhydrophobic self-healing intelligent nano-coating is adapted to environment changes. Especially, with the Mg<2+> response characteristic, the nano-coating has a good application prospect in the field of magnesium corrosion inhibition.

Description

technical field [0001] The invention belongs to the technical field of metal anticorrosion, and in particular relates to a superhydrophobic self-repairing intelligent nano-coating and a preparation method thereof. Background technique [0002] Magnesium alloys have been widely used in civil and national defense fields due to their low density, good machinability, and easy availability. However, the easy corrosion of magnesium alloys has caused huge losses to the national economy and brought many major disasters, and research on methods to effectively protect magnesium alloys has become a global topic. The current mature method of industrial technology is chromate conversion technology. However, the three parts of this technology, including production process, wastewater treatment and solid waste treatment, usually produce highly toxic and carcinogenic hexavalent chromium. In order to achieve sustainable development and meet the requirements of environmental friendliness, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/08C09D7/12
CPCC09D1/00C09D5/08C09D7/63
Inventor 傅佳骏丁晨迪刘影冯晶王明东
Owner NANJING UNIV OF SCI & TECH
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