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Fluorescent coating responsive to pH value as well as preparation method and application thereof

A fluorescent coating and fluorescent nanotechnology, applied in coatings, luminescent coatings, fluorescence/phosphorescence, etc., can solve problems such as the inability to realize visual detection of coatings, achieve enhanced corrosion resistance, prolong equipment life, and increase adhesion Effect

Active Publication Date: 2021-07-09
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a pH-responsive fluorescent coating, a preparation method and its application. The micro-nano filler enhances the corrosion resistance of the coating, thereby solving the technical problem that the visual detection of defects in the coating cannot be realized at present

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  • Fluorescent coating responsive to pH value as well as preparation method and application thereof
  • Fluorescent coating responsive to pH value as well as preparation method and application thereof
  • Fluorescent coating responsive to pH value as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] This embodiment provides a method for preparing a pH-responsive fluorescent coating, and brushing the fluorescent coating on the surface of a carbon steel plate. The specific steps are as follows:

[0031] (1) first synthesize PMMA by the method for dispersion polymerization, concrete steps: concrete steps are as follows: 10g methyl methacrylate (MMA), 1g azobisisobutyronitrile (AIBN), 1.5g polypyrrolidone (PVP), 60g methyl alcohol , 27.5g H2O were sequentially added to a 500ml two-neck round bottom flask, slowly heated to 75°C under 160rpm mechanical stirring, and then reacted at 75°C for 6h. After the reaction was finished, let it stand at room temperature for 3 hours, and then washed it with methanol for 5 times to remove the PVP stuck on the PMMA microspheres. The specific washing step was to centrifuge the particles (8000r / min, 2min). The obtained product was dried in a vacuum oven for 24 hours, and was ground to obtain PMMA microspheres with a particle size of 2 ...

Embodiment 2

[0035] This embodiment provides a method for preparing a pH-responsive fluorescent coating, and brushing the fluorescent coating on the surface of a carbon steel plate. The specific steps are as follows:

[0036] (1) According to EuCl 3 ·6H 2 The molar ratio of O to tannic acid is 1:20, weighing 0.3012g EuCl 3 ·6H 2 O dissolved in 30ml H 2 In O, get tannic acid 0.3216g and be dissolved in 80ml water, then will be dispersed in the water of 25ml according to the PMMA microsphere prepared by the same method among the embodiment 1. 100ml of water was added to a 500ml flask, and then the above solution was added to the flask. React at room temperature for 6h, then wash, dry, and grind. Fluorescent nanospheres with pH response are obtained.

[0037] (2) Weigh 0.14g of the above-mentioned fluorescent nanospheres and add them to 28.0g of epoxy resin, disperse evenly under ultrasonic, then add 7g of polyamide, and 0.2g of dispersant BYK182, 3~10 drops of leveling agent BYK-300 ...

Embodiment 3

[0039] This embodiment provides a method for preparing a pH-responsive fluorescent coating, and brushing the fluorescent coating on the surface of a carbon steel plate. The specific steps are as follows:

[0040] (1) According to EuCl 3 ·6H 2 The molar ratio of O to tannic acid is 1:5, weighing 0.3012g EuCl 3 ·6H 2 O dissolved in 30ml H 2 In O, get tannic acid 0.8016g and be dissolved in 80ml water, then will be dispersed in the water of 25ml according to the PMMA microsphere prepared by the same method among the embodiment 1. 100ml of water was added to a 500ml flask, and then the above solution was added to the flask. React at room temperature for 6h, then wash, dry, and grind. Fluorescent nanospheres with pH response are obtained.

[0041] (2) Weigh 2.8g of the above-mentioned fluorescent nanospheres and add them to 28.0g of epoxy resin, disperse evenly under ultrasonic, then add 7g of polyamide, and 0.2g of dispersant BYK182, 3~10 drops of leveling agent BYK-300 An...

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Abstract

The invention discloses a fluorescent coating responsive to a pH value as well as a preparation method and application thereof. The fluorescent coating comprises resin and fluorescent nano-microspheres dispersed in the resin, wherein the fluorescent nano-microspheres comprise polymer nano-microspheres and fluorescent substances growing on the polymer nano-microspheres in situ, and the fluorescent substances are obtained through a coordination polymerization reaction of europium salt and ligands, or the fluorescent substances are obtained by carrying out coordination polymerization reaction on terbium salt and the ligand. According to the method, a corrosion condition in the coating is indicated through fluorescence luminescence; when matrix metal below the coating is corroded, a pH value is reduced due to metal ion hydrolysis, fluorescent filler in the coating is promoted to be degraded, fluorescence quenching is caused, and coating defects and coating aging states are displayed in a visual form; and therefore, visual detection of defects in the coating is realized. The corrosion resistance of the coating can be enhanced through a micro-nano filler.

Description

technical field [0001] The invention belongs to the field of functional anti-corrosion coatings, and more specifically relates to a pH-responsive fluorescent coating, a preparation method and an application thereof. Background technique [0002] Coating protection is the most common metal anti-corrosion method, but the protective performance of the coating will be reduced due to ultraviolet radiation, salt spray erosion, high and low temperature, alternating dry and wet climate changes and wear during the service process. During the coating failure process, the aqueous solution will penetrate into the coating / substrate interface through coating defects, resulting in corrosion of the metal substrate. After the failure of many anti-corrosion coatings, although no significant changes can be seen with the naked eye, the corrosion resistance has been lost, and the infiltration of corrosive particles causes severe corrosion of the metal substrate and poses a safety hazard. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D133/12C09D187/00C09D5/22C08G83/00G01N21/64
CPCC09D163/00C09D5/22C08G83/008G01N21/6428G01N2021/6439C08L2205/035C08L2205/18C08L33/12C08L87/00
Inventor 董泽华冯学磊蔡光义曹祥康
Owner HUAZHONG UNIV OF SCI & TECH
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