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Method for preparing halloysite/epoxy composite coating capable of controlling release of corrosion inhibitor by pH response

A composite coating and controlled release technology, applied in the field of nanocomposite preparation, can solve the problems of unsatisfactory HNTs dispersion, reduced coating corrosion resistance, HNTs agglomeration, etc., and achieves low cost, improved thermal stability, and preparation process. simple effect

Active Publication Date: 2015-12-02
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this preparation process, benzotriazole (BTA) and Cu 2+ Although the method of forming a compound to encapsulate corrosion inhibitors in nanomaterials is simple, HNTs are prone to agglomeration. Whether in solvents or in coatings, the dispersion of HNTs is not ideal. In addition, since anti-corrosion epoxy coatings are high-temperature curing Coating, CO releases during curing 2 , resulting in defects (microporosity) in the coating
The corrosive medium will pass through the pores and reach the substrate, reducing the corrosion resistance of the coating

Method used

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  • Method for preparing halloysite/epoxy composite coating capable of controlling release of corrosion inhibitor by pH response
  • Method for preparing halloysite/epoxy composite coating capable of controlling release of corrosion inhibitor by pH response
  • Method for preparing halloysite/epoxy composite coating capable of controlling release of corrosion inhibitor by pH response

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Experimental program
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Effect test

Embodiment 1

[0021] Preparation method of halloysite / epoxy composite coating with pH-responsive controlled release corrosion inhibitor, see attached figure 1 , including the following steps:

[0022] (1) Loading corrosion inhibitor: Mix 2g of HNTs and 40mL of benzotriazole solution (BTA) with a concentration of 80mg / mL (BTA), and disperse ultrasonically for 30min to obtain a suspension, then place the suspension in a rotary evaporator, Rotate at 80r / min, under the conditions of 10MPa, vacuumize for 2h, open the valve to maintain normal pressure for 2min;

[0023] (2) Encapsulation corrosion inhibitor: Add 10mL distilled water and 0.5mL 25% ammonia water to the concentrated suspension, then add 0.5mL tetraethyl orthosilicate (TEOS) dropwise, react at room temperature for 12 hours, and then add dropwise Add 0.5mLTEOS, react for 12h;

[0024] (3) Modified halloysite nanotubes: After the reaction in step (2), add 1 mL of 3-aminopropyltriethoxysilane (APTES) dropwise, react at room temperatur...

Embodiment 2

[0030] Embodiment 2 comparative experiment

[0031] There is long-acting anticorrosion coating, and its preparation method comprises the following steps:

[0032] (1) Loading corrosion inhibitor: mix 2g HNTs with saturated benzotriazole acetone solution (benzotriazole 5g, acetone 50mL), ultrasonically disperse for 20min to obtain a suspension, and then place the suspension in a vacuum bottle , Use a vacuum pump to evacuate under the condition of 10MPa, turn off the vacuum pump after 3 minutes, keep the vacuum state, and then place it under normal pressure after 3 hours, repeat the above operation 3 times;

[0033] (2) The HNTs loaded with corrosion inhibitors were separated by a centrifuge, and then the corrosion inhibitors adsorbed on the surface were washed with deionized water, and dried at 60°C for 5 hours;

[0034] (3) The substance in the step (2) is dispersed in the acrylic latex paint to obtain a long-acting anti-corrosion coating.

[0035] Disadvantages: 1) The two ...

Embodiment 3

[0037] Embodiment 3 comparative experiment

[0038] There is long-acting anticorrosion coating, and its preparation method comprises the following steps:

[0039] (1) Loading corrosion inhibitor: Mix 2g HNTs and 80mg / L ethanol solution of benzotriazole (benzotriazole 4mg, ethanol 50mL), and ultrasonically disperse for 20min to obtain a white suspension, then place the suspension in In the vacuum bottle, use a vacuum pump to evacuate under the condition of 10MPa, turn off the vacuum pump after 3 minutes, keep the vacuum state for 1-5 hours, and then place it under normal pressure, repeat the above operation 3 times;

[0040](2) The HNTs loaded with corrosion inhibitors were separated by a centrifuge, and then the corrosion inhibitors adsorbed on the surface were washed with deionized water, and dried at 60°C for 5 hours;

[0041] (3) Place the HNTs of the loaded corrosion inhibitor in step (2) in copper sulfate aqueous solution (0.5-5g / L) of different concentrations, form a BT...

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Abstract

The invention discloses a method for preparing a halloysite / epoxy composite coating capable of controlling release of a corrosion inhibitor by pH response. The method comprises the following steps: (1), loading the corrosion inhibitor: performing ultrasonic dispersion on HNTs and a benzotriazole (BTA) solution for 30 min according to the weight ratio of HNTs to the BTA solution being 1:(1-1.5), so as to obtain suspension liquid and then concentrating the suspension liquid; (2), encapsulating the corrosion inhibitor: reacting distilled water, 25% aqueous ammonia, the suspension liquid with tetraethyl orthosilicate (TEOS) for 12 h; (3), modifying halloysite nanotubes: dropwise adding 3-triethoxysilylpropylamine, reacting at room temperature for 24 h, filtering, washing and drying; (4), preparing a functional coating: dispersing 3wt% of modified halloysite nanotubes in epoxy resin, and finally spraying onto steel discs for curing. According to the method for preparing the halloysite / epoxy composite coating capable of controlling release of the corrosion inhibitor by pH response, provided by the invention, the operation is simple, the prepared modified halloysite nanotubes are uniformly dispersed in epoxy resin, therefore both the toughness and the corrosion resistance of the composite material are improved.

Description

technical field [0001] The invention belongs to the field of preparation methods of nanocomposite materials, and in particular relates to a preparation method of halloysite / epoxy composite coatings with pH response controlled release corrosion inhibitors. Background technique [0002] Halloysite nanotubes (HNTs) are inexpensive natural nanotubes that are double-layered 1:1 aluminosilicates with the molecular formula Al 2 SiO 5 (OH) 4 ·nH 2 O (n=0 or 2), has a typical crystalline structure, usually a multi-walled hollow, tubular structure with open ends, which is formed by dislocation and curling of the inner layer of aluminum-oxygen octahedron and the outer layer of silicon-oxygen tetrahedral crystal lattice. There is crystal water between them, high temperature resistance, acid resistance, insulation, the length is 1-2um, the outer diameter is about 50nm, and the inner diameter is 20-30nm. [0003] Halloysite nanotubes have a wide range of uses. With the development of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/08C09D7/12
Inventor 何毅徐伟施太和范毅杨强斌卿大咏
Owner SOUTHWEST PETROLEUM UNIV
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