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Molybdate-doped polypyrrole/epoxy resin self-healing coating and its preparation and application

A technology of epoxy resin coating and epoxy resin, applied in the direction of epoxy resin coating and coating, can solve the problems of complicated preparation process, and achieve the effects of simple preparation process, corrosion inhibition and high degree of cross-linking

Inactive Publication Date: 2017-06-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the above-mentioned polypyrrole filler is cumbersome, and a polypyrrole self-healing coating with a simple preparation process needs to be developed.
The self-healing coating is suitable for the protection of aerospace aluminum alloy 2024. There is no relevant literature report on the application of polypyrrole self-healing coating on aerospace aluminum alloy.

Method used

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  • Molybdate-doped polypyrrole/epoxy resin self-healing coating and its preparation and application
  • Molybdate-doped polypyrrole/epoxy resin self-healing coating and its preparation and application
  • Molybdate-doped polypyrrole/epoxy resin self-healing coating and its preparation and application

Examples

Experimental program
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preparation example Construction

[0031] (1) Preparation of molybdate-doped polypyrrole (parts by mass): Add 1 to 3 parts of pyrrole monomer dropwise in 4 to 8 parts of sodium molybdate aqueous solution, and add 50 to 60 parts of oxidant ammonium persulfate aqueous solution dropwise. Parts, magnetically stirred and polymerized at 0-2°C in a nitrogen atmosphere for 5-6 hours, filtered, washed, and vacuum-dried at 50-70°C for 5-10 hours to obtain black molybdate-doped polypyrrole.

[0032] (2) Preparation of polypyrrole-epoxy resin coating (parts by mass): Take 8-20 parts of the prepared molybdate-doped polypyrrole, add 70-80 parts of organic solvent, anti-sedimentation agent, defoamer and fluid 0.7-1 parts of each leveling agent (anti-settling agent, defoamer, and leveling agent are commonly used additives for epoxy resin coatings, such as: anti-settling agent is modified hydrogenated castor oil, defoaming agent is methyl silicone oil or fatty acid alkanes Base ester, leveling agent is silane or acrylate), 140-...

Embodiment 1

[0036] Take 3.5 parts of dopant sodium molybdate, mix it with deionized water at a mass ratio of 1:45, and stir magnetically to form an aqueous solution of dopant. Keep the temperature of the entire reaction system at 2°C, add 2 parts of pyrrole monomer dropwise to the reaction system in a nitrogen atmosphere, and then add an aqueous solution of oxidant ammonium persulfate prepared in advance (the mass ratio of ammonium persulfate to deionized water is 1:17) 54 parts drop by drop. After magnetic stirring and polymerization for 6 hours, the reaction was stopped, the obtained product was filtered, and the filter cake was washed with deionized water several times. After the product was dried in a vacuum oven at 60° C. for 8 hours, black sodium molybdate-doped polypyrrole was obtained, and the doping amount of sodium molybdate in this embodiment was 10 wt%.

[0037] Take 8 parts of sodium molybdate doped with polypyrrole, and 80 parts of organic solvent are uniformly dispersed in...

Embodiment 2

[0048] Take 3.5 parts of dopant sodium molybdate, mix it with deionized water at a mass ratio of 1:50, and stir magnetically to form an aqueous solution of dopant. Keep the temperature of the entire reaction system at 2°C, add 2 parts of pyrrole monomer dropwise to the reaction system in a nitrogen atmosphere, and then add an aqueous solution of oxidant ammonium persulfate prepared in advance (the mass ratio of ammonium persulfate to deionized water is 1:7) 60 parts drop by drop. After magnetic stirring and polymerization for 6 hours, the reaction was stopped, the obtained product was filtered, and the filter cake was washed with deionized water several times. After the product was dried in a vacuum oven at 60° C. for 8 hours, black sodium molybdate-doped polypyrrole was obtained, and the doping amount of sodium molybdate in this embodiment was 12 wt%.

[0049] Take 12 parts of sodium molybdate doped with polypyrrole and 70 parts of organic solvent to disperse evenly in an ul...

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Abstract

The invention relates to a molybdate doped polypyrrole / epoxy resin self-healing coating, a preparation method thereof and an application thereof, and belongs to the field of metal anti-corrosion coatings. The coating is composed of two parts, namely a polypyrrole / epoxy resin system mother liquor, and a polyamide curing agent. The polypyrrole / epoxy resin system mother liquor comprises molybdate doped polypyrrole, epoxy resin, an anti-settling agent, an anti-foaming agent, a levelling agent and an organic solvent. The molybdate doped polypyrrole is added in the organic solvent and then the mixture is uniformly dispersed in an ultrasonic dispersion instrument. After that, the anti-settling agent, the antifoaming agent and the levelling agent are added respectively, and are stirred on a magnetic stirring apparatus. Then the epoxy resin is added to form the uniformly dispersed polypyrrole / epoxy resin system mother liquor. The polyamide curing agent is added in the prepared mother liquor, and is stirred to be uniformly dispersed. In this way, a molybdate doped polypyrrole / epoxy resin self-healing coating can be obtained. The coating is sprayed or brushed onto the 2024 type aluminum alloy after being subjected to oil-removing treatment. After the drying and curing process of the coating at the room temperature, a molybdate doped polypyrrole / epoxy resin self-healing coating can be formed.

Description

technical field [0001] The invention relates to a molybdate-doped polypyrrole / epoxy resin self-repair coating and its preparation and application, belonging to the field of metal anti-corrosion coatings. Background technique [0002] Metal corrosion has long been a major issue that needs to be solved urgently in industrial production, so it is of great significance to research and develop effective corrosion protection measures. The most widely used method in the metal protection method is to coat the metal surface with anti-corrosion paint. Since the film-forming resin only has barrier properties, anti-rust pigments such as chromate are usually added to the paint to improve the anti-corrosion performance of the paint. When the coating is damaged, the chromate in the coating can form a passivation film on the metal surface to inhibit the initiation of corrosion. However, chromate is carcinogenic, so it is an urgent goal to develop fillers to replace chromate to achieve long...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D179/04C09D7/12C08G73/06
Inventor 田亚媛管勇严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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