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Self-repairing anticorrosive coating and preparation method thereof

An anti-corrosion coating and automatic repair technology, applied in anti-corrosion coatings, coatings, epoxy coatings, etc., can solve the problems of poor coating compatibility, large amount of nanoparticles, easy to damage the integrity of the coating, etc. Corrosion, Compatibility Enhancement Effects

Active Publication Date: 2019-04-12
ZHENGZHOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of nanoparticles used in the above-mentioned anti-corrosion coating is relatively large, which has poor compatibility with the coating and easily destroys the integrity of the coating.

Method used

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  • Self-repairing anticorrosive coating and preparation method thereof
  • Self-repairing anticorrosive coating and preparation method thereof
  • Self-repairing anticorrosive coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0054] Schematic diagram of the preparation of stimuli-responsive mesoporous silica and the chemical structures of the main reagents such as figure 1 shown.

[0055] A self-healing anti-corrosion coating, including the following parts

[0056] (1) Stimuli-responsive mesoporous silica loaded with corrosion inhibitor 0.5-5 parts by weight

[0057] (2) Cured resin 95-99.5 parts by weight.

[0058] The resin cured product is formed by curing epoxy resin, epoxy curing agent and water.

[0059] The epoxy resin is bisphenol A type epoxy resin, and the epoxy curing agent is polyetheramine D230 and n-decylamine.

[0060] The cured resin is a cured polyurethane formed by curing a hydroxyl-containing resin, an isocyanate curing agent and water.

[0061] The stimuli-responsive mesoporous silica loaded with a corrosion inhibitor is composed of a corrosion inhibitor and a stimuli-responsive mesoporous silica, the corrosion inhibitor is located in the pore structure of the stimuli-respon...

Embodiment 1

[0091] A method for preparing an automatically repairable anti-corrosion coating, comprising the following steps:

[0092] (1) Preparation of mesoporous silica as a nano container;

[0093] (1a): Dissolve 10g of dodecyltrimethylammonium bromide and 5g of sodium hydroxide in 5L of water to obtain an alkaline aqueous solution; slowly drop 50mL of tetraethyloxysilane into the above alkaline aqueous solution, and react at a constant temperature under stirring 4h, the reaction temperature was 70°C; centrifuged, washed and dried to obtain mesoporous silica microspheres MSN;

[0094] (1b): Disperse mesoporous silica microspheres MSN in toluene solution, add silane coupling agent-glycidyl ether propyl trimethoxysilane drop by drop, reflux reaction for 12h, centrifuge, wash and dry to obtain ring Oxygen-modified mesoporous silica microspheres (MSN-epoxy);

[0095] The weight ratio of mesoporous silica microspheres to glycidyl ether propyl trimethoxysilane is 0.5:1;

[0096] (1c): Disp...

Embodiment 2

[0105] A method for preparing an automatically repairable anti-corrosion coating, comprising the following steps:

[0106] (1) Preparation of mesoporous silica as a nano container;

[0107] (1a): Dissolve 15g of dodecyltrimethylammonium bromide and 6g of sodium hydroxide in 5L of water to obtain an alkaline aqueous solution; slowly drop 100mL of tetraethyloxysilane into the above alkaline aqueous solution, and react at a constant temperature under stirring 4.5h, the reaction temperature is 75°C; centrifuge, wash and dry to obtain mesoporous silica microspheres MSN;

[0108] (1b): Disperse mesoporous silica microspheres MSN in toluene solution, add silane coupling agent-glycidyl ether propyl trimethoxysilane drop by drop, reflux reaction for 13h, centrifuge, wash and dry to obtain ring Oxygen-modified mesoporous silica microspheres (MSN-epoxy);

[0109] The weight ratio of mesoporous silica microspheres to glycidyl ether propyl trimethoxysilane is 1.0:1;

[0110] (1c): Dispe...

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Abstract

The invention provides a self-repairing anticorrosive coating. The self-repairing anticorrosive coating comprises the following parts: 0.5 to 5 parts (by weight) of corrosion inhibitor loaded stimulation-responsive mesoporous silicon dioxide and 95 to 99.5 parts (by weight) of resin cured substance. The anticorrosive coating provided by the invention has dual stimulation responsiveness to acids and reducers and can achieve self-repairing. After the coating is destroyed, a local microenvironment changes, a corrosion inhibitor loaded stimulation-responsive mesoporous silicon dioxide shell high polymer, i.e., N-tert-butyl carbonyl in the coating is subjected to hydrolyzed removal (under the stimulation of the acids) or dithio bond rupture (under the stimulation of the reducers) under the stimulation of outside acids or reducers (for instance sulfur ions), the shell high polymer is subjected to hydrophobic-hydrophilic conversion, then, mesoporous silicon dioxide pore passages are exposed,the loaded corrosion inhibitor is quickly released to form a protective film, and corrosion can be effectively inhibited.

Description

technical field [0001] The invention belongs to the technical field of polymer anticorrosion coating materials, and in particular relates to an anticorrosion coating capable of automatic repair and a preparation method thereof. Background technique [0002] Corrosion of metal materials pervades all fields of the national economy, causing huge waste of resources and economic losses. The total annual corrosion cost in my country exceeds 2.1 trillion yuan, accounting for about 5% of the gross national product. [0003] Among all anti-corrosion measures, anti-corrosion coating is the most widely used due to its simple operation, wide application and low cost. Organic anti-corrosion coatings isolate the metal substrate from corrosive media such as moisture, oxygen, and ions through physical shielding, and inhibit the corrosion anodic and cathodic reactions, thereby preventing the occurrence of corrosion electrochemical reactions. However, during service and transportation, the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/08
CPCC08K2201/014C09D5/08C09D163/00C08K9/12C08K5/3475C08K5/47C08K5/3437
Inventor 陈燕敏王玲陈建军王鑫陈凌霞孙海杰毛海荣
Owner ZHENGZHOU NORMAL UNIV
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