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Sunlight-driven self-repairing coating, coating layer, and preparation method of coating layer

A self-healing, sunlight technology, used in coatings, polyester coatings, polyamide coatings, etc., can solve the problems of strict repair conditions, inability to achieve multiple repairs of coatings, and inability to achieve self-repair, etc., to extend the protection life. , Excellent sunlight-driven self-healing effect, wide application range

Active Publication Date: 2021-12-31
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main disadvantage of the foreign-aided self-healing coating is that it cannot achieve multiple repairs of the coating. When the coating is damaged again, the defect cannot be repaired
In this regard, patent CN201810587779.X provides a self-healing graphene / thermoplastic resin coating, but the coating needs to be repaired under laser irradiation, and the repair conditions are strict, and self-healing under sunlight cannot be achieved. repair

Method used

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  • Sunlight-driven self-repairing coating, coating layer, and preparation method of coating layer
  • Sunlight-driven self-repairing coating, coating layer, and preparation method of coating layer
  • Sunlight-driven self-repairing coating, coating layer, and preparation method of coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1 Solar-driven self-healing coating

[0046] 1. Raw materials

[0047] This implementation provides 7 kinds of self-healing coatings, the composition of which is shown in Table 1.

[0048] Table 1 Raw material composition of different self-healing coatings

[0049]

[0050]

[0051]

[0052] 2. Preparation of coating

[0053](1) The substrate material is 2024 aluminum alloy. The substrate is polished with 2000# sandpaper to remove the corrosion products existing on the surface, then cleaned with acetone and ethanol, and dried for later use.

[0054] (2) Add organic resin, thermoplastic phase change material, and curing agent to a good solvent and ultrasonically dissolve (the power is 75W, and the ultrasonic time is 120min), then add photothermal materials, and stir at 1000rpm / min to fully disperse to obtain a repair coating;

[0055] (3) Spin-coat the repair coating on the surface of the treated base material, wait for 7 days for the solvent to vo...

experiment example 1

[0072] Taking coating 2 in embodiment 1 as an example, its microstructure, morphology before and after solar repair, electrochemical impedance spectroscopy (EIS) of the coating before and after solar repair are characterized, and the results are shown in Figure 1-3 .

[0073] 1. Experimental method

[0074] (1) Observation of microstructure: The microstructure of the coating was observed by scanning electron microscope (SEM).

[0075] (2) Observation of morphology before and after sunlight repair: use a scalpel to prepare scratches or small hole defects on the surface of the prepared coating, put the defective coating under sunlight between noon and 2 p.m., and observe the surface repair situation. Record the repair of the surface at regular intervals.

[0076] (3) Electrochemical impedance spectroscopy of the coating before and after solar repair: put the repaired sample in 3.5% NaCl medium, and use an electrochemical workstation (Gamry 600) to test the AC impedance spect...

experiment example 2

[0083] The coatings a-c in Comparative Example 1 and the coatings e-f in Comparative Example 2 were scratched with a scalpel on the surface of the prepared coatings, and the coatings with defects were exposed to sunlight between noon and 2 p.m. For 600 s, before and after exposure to sunlight, each sample was placed in a 3.5% NaCl medium, and an electrochemical workstation (Gamry 600) was used to test the AC impedance spectrum of the coating.

[0084] table 5

[0085]

[0086] It can be seen from the results in Table 5 that after the scratch defects of coatings a-f are repaired under sunlight, the impedance modulus values ​​of the coatings are not significantly different from those of the defective coatings with scratches, indicating that the scratched coatings a-f are repaired Complete restoration of the coating cannot be achieved under sunlight exposure.

[0087] It shows that the present invention achieves the best sunlight self-healing effect by reasonably controlling ...

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Abstract

The invention provides a sunlight-driven self-repairing coating, a coating and a preparation method thereof. The self-repairing coating is prepared from 2-50 parts of organic resin, 0.1-5.1 parts of a photo-thermal material and 2-25 parts of a thermoplastic phase-change material. The specific organic resin, the photo-thermal material and the thermoplastic phase-change material are reasonably matched to obtain the self-repairing coating, and a substrate is further coated with the coatig to prepare the self-repairing organic coating layer, the self-repairing coating layer has an excellent sunlight-driven self-repairing effect, defects of the organic coating layer can be repaired for multiple times under sunlight, the protection life of the organic coating layer is prolonged, a novel selection scheme is provided for a self-repairing coating system, and the application range is wide.

Description

technical field [0001] The invention relates to the technical field of intelligent self-repairing coatings, in particular to a solar-driven self-repairing coating, a coating and a preparation method thereof. Background technique [0002] Organic coatings are widely used in marine military and civilian equipment. However, defects such as pores are easily formed during the coating process. Under the influence of high temperature, high humidity, and high salt marine atmospheric environment, micro Cracks form channels for water, oxygen, and salt, leading to corrosion of the base metal under the coating. The corrosion of the base will accelerate the failure of the coating, thereby increasing maintenance costs and bringing safety hazards to engineering structures. [0003] Self-healing provides a new idea for improving the performance of organic coatings. Inspired by the self-healing of organisms after damage, the US military first proposed the concept of "self-repair" in the 198...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D167/08C09D161/06C09D133/00C09D175/04C09D177/00C09D179/08C09D7/61C09D7/63C09D7/65
CPCC09D163/00C09D167/08C09D161/06C09D133/00C09D175/04C09D177/00C09D7/61C09D7/63C09D7/65C08K2003/2275C08K2003/2289C08K2003/2237C08K3/22C08K5/05C08L79/08C08L79/085C08L79/04C08K3/041C08K3/04C08K3/042C08K5/09C08K5/01
Inventor 林志峰郝振涛郑海兵李伟华
Owner SUN YAT SEN UNIV
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