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Layer-by-layer self-assembly pH response type silicon dioxide nano-container and preparation thereof, and application of silicon dioxide nano-container in composite silane film

A layer-by-layer self-assembly and silicon dioxide technology, which is applied in the direction of anti-corrosion coatings, etc., can solve the problems of cumbersome and complicated operation steps and the influence of coating stability, and achieve the effect of simple coating structure design, low cost, and inhibition of corrosion expansion

Pending Publication Date: 2021-09-28
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned prior art not only has the disadvantage of cumbersome and complicated operation steps, but also has the possibility of having a certain negative impact on the stability of the coating

Method used

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  • Layer-by-layer self-assembly pH response type silicon dioxide nano-container and preparation thereof, and application of silicon dioxide nano-container in composite silane film
  • Layer-by-layer self-assembly pH response type silicon dioxide nano-container and preparation thereof, and application of silicon dioxide nano-container in composite silane film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A method for preparing layer-by-layer self-assembled pH-responsive silica nano-containers, comprising the following steps:

[0054] (1) Synthesize silica nano-containers (that is, hollow mesoporous silica nanoparticles) by the dura plate method, and obtain well-dispersed silica microspheres by a method with simple process and low cost.

[0055] The specific process is: Stir and mix 55mL deionized water, 0.16g CTAB, 26mL ethanol and 1mL TEOS for 5min, then add 1mL ammonia water, stir at room temperature for 3h, collect the solid phase by centrifugation, wash repeatedly with deionized water and ethanol, and dry , calcined at 550°C for 5h to remove the dura mater and obtain hollow mesoporous silica nanoparticles.

[0056] like figure 1 As shown, it is the nitrogen adsorption-desorption diagram and pore size distribution diagram of hollow silica nanoparticles, and the specific surface area is 1275.5403m 2 / g, the pore volume is 1.2765ml / g, the average pore diameter measur...

Embodiment 2

[0063] With SiO prepared by the above-mentioned embodiment 1 2 Layer-by-layer self-assembly of pH-responsive silica nanocontainers with / PEI / PSS / PEI / PSS structure for the preparation of composite silane membranes

[0064] Soak the metal substrate working electrode in the composite silane solution containing mesoporous silica nanoparticles loaded with corrosion inhibitor. After 5 minutes, take out the working electrode and dry it for curing. The drying temperature is 80°C and the drying time is 2 hours. A composite silane film attached to the working electrode was obtained. The metal substrate here is aluminum alloy.

[0065] The three-electrode system (the three-electrode system uses platinum wire as the counter electrode, calomel as the reference electrode, and the metal substrate attached to the composite silane film as the working electrode) is immersed in 3.5wt% sodium chloride solution, and the The data measured by the ChemStation prove that the composite silane film of...

Embodiment 3

[0080] Compared with Example 1, most of them are the same, except that the preparation process of hollow mesoporous silica nanoparticles in this example is as follows:

[0081] Stir and mix 50mL of deionized water, 0.10g of CTAB, 20mL of ethanol and 0.5mL of TEOS for 3min, then add 1mL of ammonia water, stir at room temperature for 2h, collect the solid phase by centrifugation, wash repeatedly with deionized water and ethanol, and dry it at 530 Calcining at ℃ for 3 hours to remove the dura mater to obtain hollow mesoporous silica nanoparticles.

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Abstract

The invention relates to a layer-by-layer self-assembly pH response type silicon dioxide nano-container and preparation thereof, and application of the silicon dioxide nano-container in a composite silane film. A preparation method of the nano-container comprises the following steps: mixing hexadecyl trimethyl ammonium bromide, deionized water, ethyl alcohol, tetraethoxysilane and ammonia water, conducting centrifuging to obtain a solid phase, and performing calcination to obtain hollow silicon dioxide nanoparticles; mixing dispersed powder with a benzotriazole solution, and carrying out repeated vacuumizing by using a vacuum pump to obtain a particle loaded with a corrosion inhibitor; and depositing a polyelectrolyte shell on the outer layer of the obtained particle in an LbL mode to obtain the layer-by-layer self-assembly pH response type silicon dioxide nano-container. An obtained sample is added into a BTSE / KH-560 mixed silane solution for application. The prepared composite silane film has a potential self-healing effect, and compared with a traditional metal anti-corrosion agent, the composite silane film is low in toxicity, small in pollution in the production process and friendly to environment.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a layer-by-layer self-assembled pH-responsive silicon dioxide nano container and its preparation and application in composite silane membranes. Background technique [0002] Corrosion is an extremely important problem that humans have tried to understand and control since the beginning of working with metallic objects. The corrosion degradation process of materials is not only very complicated, but also has great economic significance. Aluminum alloys are widely used in the aircraft industry for their optimum weight and strength, and exhibit resistance to generalized corrosion due to the formation of a natural, inert and protective oxide layer. However, because it contains intermetallic inclusions, it is prone to localized pitting corrosion, thereby destroying the structural integrity of the alloy. Currently, its corrosion protection is done by depositing pre-treatment,...

Claims

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Application Information

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IPC IPC(8): C08L79/02C08L25/18C08K9/12C08K5/3475C09D5/08
CPCC08L79/02C08L25/18C09D5/08C08K9/12C08K5/3475
Inventor 蒋继波李雨露唐佳斌许文秀李明晶孙冉黄星魏影陈晓敏李婷婷周少博宣宇娜丛海山王云云韩生
Owner SHANGHAI INST OF TECH
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