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Nanometer container and sol-gel coating based on ZIF-8 structure and preparation method of nanometer container and sol-gel coating

A ZIF-8, nano-container technology, applied in the fields of nanotechnology, coating, nanotechnology, etc. for materials and surface science, can solve the problems of degradation of coating performance, lack of self-healing function, weakening of coating integrity, etc. , to achieve the effect of easy operation, conducive to large-scale batch production, and inhibition of corrosion expansion

Pending Publication Date: 2022-03-11
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, after corrosion occurs, this passive filler lacks self-healing function. Therefore, active corrosion inhibitors can be doped in the coating to achieve active corrosion protection. However, directly adding corrosion inhibitors will weaken the integrity of the coating, resulting in Coating performance degradation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0052] The invention provides a kind of preparation method based on the nano container of ZIF-8 structure, comprises the following steps:

[0053] (1) Preparation of ZIF-8 nanoparticles: 2-methylimidazole and Zn(NO 3 ) 2 ·6H 2 O (zinc nitrate hexahydrate) is dissolved in methanol, after the reaction post-treatment to obtain ZIF-8 nanoparticles;

[0054] (2)ZIF-8@mSiO 2 Preparation: After dispersing the ZIF-8 nanoparticles obtained in step (1), add hexadecyltrimethylammonium bromide and tetraethyl orthosilicate, mix well and post-process to obtain ZIF-8@mSiO 2 ;

[0055] (3) Preparation of HMSN: ZIF-8@mSiO obtained in step (2) 2 Mixing with hydrochloric acid, etching the ZIF-8 nanoparticles obtained in step (1), and post-processing to obtain HMSN (hollow mesoporous silica nanoparticles);

[0056] (4) Preparation of HMSN-BTA: Mix the HMSN obtained in step (3) with a saturated acetone solution of BTA (benzotriazole), stir in a vacuum and circulate to normal pressure, then s...

Embodiment 1

[0089]The present embodiment provides a kind of preparation method based on the nano container of ZIF-8 structure, comprises the following steps:

[0090] (1) Preparation of ZIF-8 template: 5.6g of 2-methylimidazole and 2.5g of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 100 mL of methanol, stirred continuously at room temperature for 1 h, and then centrifuged at 9000 rpm for 8 min, and the obtained precipitate was washed with methanol three times and dried at 80 °C for 12 h.

[0091] (2)ZIF-8@mSiO 2 Preparation: 0.5g of the ZIF-8 nanoparticles obtained in step (1) were dispersed in a solution containing 300mL of deionized water, 240mL of ethanol and 2.3g of 2-methylimidazole, ultrasonically treated for 30min; then 1.6g of hexadecane was added Trimethylammonium bromide (CTAB), and stirred for 30 min. Finally, 5 mL of ethyl orthosilicate was added to the solution within 10 min. The mixed solution was stirred vigorously for 2 h, centrifuged at 7000 rpm for 8 min, and then the prec...

Embodiment 2

[0096] The ZIF-8-based nanocontainer prepared in Example 1 was used to prepare the sol-gel coating.

[0097] (1) Preparation of zirconia sol: Add 5mL of 70wt% TPOZ to the mixed solution of propylene glycol and ethyl acetoacetate (25mL each of propylene glycol and ethyl acetoacetate); stir the mixture obtained above at 16°C for 40min under ultrasonic stirring , a complex reaction occurs to obtain zirconia sol.

[0098] (2) Preparation of organosiloxane sol: nanocontainer based on ZIF-8 structure, Zr / H 2 Acidified aqueous solution of O and GPTMS were added to propan-2-ol (nanocontainers based on ZIF-8, Zr / H 2 O acidified aqueous solution, GPTMS and propan-2-ol in a molar ratio of 1:3:2:4) to obtain an organosiloxane sol.

[0099] (3) Preparation of sol-gel mixture: using the controllable sol-gel method, the zirconia sol obtained in step (1) is mixed with the organosiloxane sol obtained in step (2) in a volume ratio of 1:2, Stirring under ultrasonic stirring for 60 min, aging ...

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Abstract

The invention relates to the technical field of high polymer materials, in particular to a nano container and a sol-gel coating based on a ZIF-8 structure and a preparation method of the nano container and the sol-gel coating. According to the invention, ZIF-8 nano-particles are used as a self-sacrifice template of HMSN, a pH response type'gate valve 'and an interface compatibility auxiliary agent, and a novel pH response type HMSN-BTA-ZIF-8 nano-container is designed. The HMSN-BTA-coated ZIF-8 is used as a substrate to prepare a sol-gel coating, and then the sol-gel coating is applied, so that metal corrosion can be effectively delayed. The obtained sol-gel coating (intelligent anticorrosive coating) has a potential self-healing effect, and compared with a traditional metal anticorrosive agent, the sol-gel coating is low in toxicity, small in pollution in the production process and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a ZIF-8-based nano container, a sol-gel coating and a preparation method thereof. Background technique [0002] Metals with high mechanical properties and high electrical conductivity find applications in aeronautics, bridges, automobiles and electronics. However, metals are easily attacked by corrosive media in the environment, especially in marine environments, which not only cause economic losses, but also cause potential safety hazards and environmental pollution. At present, the application of protective coatings with anti-corrosion properties has been considered as the most effective, convenient and cheapest way to prevent metal corrosion. The traditional organic polymer coating is a typical sol-gel coating, which has excellent wear resistance, adhesion and stability to acid and alkali conditions, and can form a barrier layer to prevent the diffusion of corrosive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/08C23F11/14C23F11/00C09D183/06C09D7/61B82Y30/00B82Y40/00
CPCC09D5/08C23F11/149C23F11/00C09D183/06C09D7/61B82Y30/00B82Y40/00C08K2003/2244C08K9/12C08K5/3475C08K3/22
Inventor 蒋继波李雨露黄星许文秀孙冉周少博陈晓敏李婷婷魏影李明晶丛海山韩生
Owner SHANGHAI INST OF TECH
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