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Nano container loaded with corrosion response agent, preparation method and application thereof

A nano-container and curing agent technology, applied in the direction of anti-corrosion coatings, coatings, epoxy resin coatings, etc., can solve the problems that the coating cannot provide good shielding effect, the impact of the compactness of the coating film, and limit the wide range of applications, etc., to achieve Good application prospects, excellent protection performance, and fast corrosion response

Inactive Publication Date: 2020-06-02
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] People's research on self-healing anti-corrosion coatings can be roughly divided into two categories: one is to use polymer capsules to coat healing agents, such as isocyanate, epoxy resin, linseed oil, etc., and use cross-linking and curing reactions to repair coating defects. The size of the microcapsules required for self-healing coatings is large, which will have a certain impact on the compactness of the coating film, limiting its wide application
The other is to use nano-containers to encapsulate corrosion inhibitors, and use the coordination between corrosion inhibitors and metal substrates to adsorb and form a protective film on the exposed metal surface to prevent the oxidation reaction of metals. Usually, the nano-containers used are mesoporous , porous materials, and most of them are spherical or tubular, which cannot provide a good shielding effect for the coating
[0004] At present, there are many studies on self-healing anti-corrosion coatings, and there are many methods for preparing self-healing anti-corrosion coatings, but traditional self-healing coatings cannot directly reflect the occurrence of localized corrosion

Method used

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  • Nano container loaded with corrosion response agent, preparation method and application thereof
  • Nano container loaded with corrosion response agent, preparation method and application thereof
  • Nano container loaded with corrosion response agent, preparation method and application thereof

Examples

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preparation example Construction

[0031] An aspect of the embodiments of the present invention provides a method for preparing a nanocontainer loaded with a corrosion response agent, which includes:

[0032] Mix mesoporous silica and dispersion solvent uniformly to form a silica dispersion;

[0033] Adding a corrosion response agent to the silica dispersion, mixing evenly, and centrifuging to obtain silica loaded with a corrosion response agent;

[0034] And, uniformly mix the silicon dioxide loaded with the corrosion response agent and the chitosan solution, then add sodium tripolyphosphate into the mixed solution, mix evenly, and centrifuge to prepare the nano container loaded with the corrosion response agent.

[0035] In some more specific embodiments, the weight ratio of the mesoporous silica, dispersion solvent, corrosion response agent solution, chitosan and sodium tripolyphosphate is (2-5):100:(10-15 ):(5-10):(1-5).

[0036] Further, the concentration of the corrosion response agent in the corrosion ...

Embodiment 1

[0078] 1. Preparation of nanocontainers loaded with corrosion responsive agents:

[0079] (1) Mix 2 parts of mesoporous silica (MSN) with 100 parts of absolute ethanol, stir for 2 hours, and ultrasonically disperse for 30 minutes to form a silica dispersion;

[0080] (2) Add 10 parts of phenanthroline (Phen) solution with a mass fraction of 50 mg / mL to the silica dispersion formed in step (1), then stir for 24 hours, ultrasonically disperse, centrifuge and remove the upper solution, respectively Wash the lower layer of solids with absolute ethanol and deionized water to obtain silica loaded with o-phenanthroline;

[0081] (3) 5 parts of chitosan (CS) solutions with a mass fraction of 2 mg / mL were mixed and stirred for 2 h with the silica loaded with o-phenanthroline prepared in step (2), and then 2 parts of a mass fraction of 2 mg / mL were added. mL of sodium tripolyphosphate (TPP) solution, stirred for 1 h, removed the upper solution after centrifugation, washed the solids in...

Embodiment 2

[0089] 1. The preparation of the nano container loaded with corrosion response agent is the same as in Example 1;

[0090] 2. Preparation of dual-function anti-corrosion coating with self-corrosion early warning and self-repair:

[0091] (1) Mix 1 part of the prepared nano-container loaded with corrosion response agent with 1 part of diluent, stir for 20 minutes, and ultrasonically disperse for 20 minutes to prepare the first mixture;

[0092] (2) Add 40 parts of epoxy resin, 1 part of Triton, and 1 part of BYK-348 to the first mixture, and then stir for 1 hour to form the second mixture;

[0093] (3) Add 10 parts of EK-8538 to the second mixture, stir for 30 minutes, and then disperse by ultrasonic to form a dual-function anticorrosive coating with self-corrosion early warning and self-repair;

[0094] (4) Carbon steel electrodes (2×2cm 2 ) was polished step by step on SiC sandpaper, followed by ultrasonic treatment with absolute ethanol and acetone; the prepared coating wa...

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Abstract

The invention discloses a nano container loaded with a corrosion response agent, a preparation method and application thereof. The preparation method of the nano container loaded with the corrosion response agent comprises the following steps of: mixing mesoporous silica with a dispersing solvent uniformly to form a silica dispersion liquid; then adding a corrosion response agent solution into thesilica dispersion liquid, mixing the substances uniformly, and carrying out post-treatment to obtain silica loaded with the corrosion response agent; and finally, uniformly mixing the silica loaded with the corrosion response agent with a chitosan solution, adding a sodium tripolyphosphate solution into the mixed solution, mixing the substances uniformly, and carrying out post-treatment to obtainthe nano container loaded with the corrosion response agent. A prepared bifunctional anticorrosive coating with corrosion self-early-warning and self-repairing functions is high in sensitivity, localcorrosion of a metal surface can be rapidly detected, and a corrosion inhibition film is formed at a corrosion interface to play a self-repairing role, therefore the nano container loaded with the corrosion response agent has good application prospects in material corrosion protection evaluation and detection.

Description

technical field [0001] The invention belongs to the technical field of surface protection, and in particular relates to a nano container loaded with a corrosion response agent and a preparation method and application thereof. Background technique [0002] Applying organic coatings is considered to be the most effective and economical method to prevent metal corrosion, and its cost accounts for about two-thirds of the total cost of anticorrosion. The organic coating mainly isolates the base metal from the corrosive medium to avoid the occurrence of corrosive electrochemical reactions. During the long-term use of the coating, micro-defects will occur on the surface of the coating, and such micro-defects are difficult to be directly observed. If it is not repaired in time and effectively, the corrosive medium will penetrate into the coating and reach the metal interface. Initiate local corrosion of the metal, resulting in a greatly reduced service life of the coating. At pres...

Claims

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Application Information

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IPC IPC(8): C09D5/08C09D163/00
CPCC08K2003/324C08K2201/003C09D5/08C09D163/00C08L5/08C08K9/12C08K5/3437C08K3/32
Inventor 赵海超刘成宝王立平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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