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A preparation method of self-healing microcapsules and its application in superhydrophobic coatings

A self-healing microcapsule and superhydrophobic coating technology, which is applied in the direction of microcapsule preparation, microsphere preparation, coating, etc., can solve the problem of limiting the application of superhydrophobic materials, loss of superhydrophobic performance, and poor durability of artificial superhydrophobic surfaces etc. to achieve the effects of increased specific surface area, increased surface energy, and strong surface adsorption capacity

Active Publication Date: 2021-09-17
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the artificial superhydrophobic surface has poor durability in actual use, and it is easy to lose superhydrophobic properties due to physical damage such as scratching and abrasion, which greatly limits the application of superhydrophobic materials. In addition, the coating is eroded by acid and alkali solutions. When damaged, the solution also loses its super-hydrophobic properties. Therefore, the super-hydrophobic material is endowed with self-healing properties, and the repair "program" is initiated spontaneously when the material is damaged, making up for the adverse effects of damage on the structure and components of the material, and repairing the damaged super-hydrophobic material. Hydrophobic properties can effectively prolong the service life of the material, which is of great significance to expand its application field

Method used

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  • A preparation method of self-healing microcapsules and its application in superhydrophobic coatings
  • A preparation method of self-healing microcapsules and its application in superhydrophobic coatings
  • A preparation method of self-healing microcapsules and its application in superhydrophobic coatings

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Embodiment 1

[0036] A kind of preparation method of self-healing microcapsule of the present embodiment, comprises the following steps:

[0037] (1) First prepare porous titanium dioxide nanoparticles: porous titanium dioxide nanoparticles are prepared as follows: add ethanol, tetrabutyl orthotitanate, diethanolamine, and glacial acetic acid to the beaker in sequence according to the volume ratio of 1:0.5:0.05:0.8 Stir for 2 hours to form a milky white suspension and age for 12 hours. Pour off the supernatant and wash with acetone centrifuge for 3 times to remove impurity ions. Dry at 60°C for 12 hours and grind to obtain powdered titanium dioxide. Calcinate the powdered titanium dioxide at 300°C for 3 hours , to obtain porous titanium dioxide nanoparticles;

[0038] (2) Add the prepared porous titanium dioxide nanoparticles into a mixed solution of deionized water and ethanol with a volume ratio of 2:1, stir and dissolve, add the low surface energy substance into it and stir for 2.5h to f...

Embodiment 2

[0043] A kind of preparation method of self-healing microcapsule of the present embodiment, comprises the following steps:

[0044] (1) First prepare porous zinc oxide nanoparticles: porous zinc oxide nanoparticles are prepared as follows: 2.2g of zinc acetate is dissolved in 20ml of ethanolamine, and a mixture of deionized water and ethanol with a volume ratio of 1:2 is added 10ml of the solution was stirred for 30min, then reacted at a constant temperature at 175°C for 6h, centrifuged and washed until neutral, dried at 60°C for 12h, ground and calcined at 350°C for 3.5h to obtain porous zinc oxide nanoparticles;

[0045] (2) adding the prepared porous zinc oxide nanoparticles to a mixed solution of deionized water and ethanol with a volume ratio of 2:1, stirring and dissolving, adding a low surface energy substance to it and stirring for 2 hours to form a mixed solution A to obtain a capsule core, Wherein, 22g of porous zinc oxide nanoparticles, 25g of a mixed solution of de...

Embodiment 3

[0048] A kind of preparation method of self-healing microcapsule of the present embodiment, comprises the following steps:

[0049] (1) First prepare porous silica nanoparticles: porous silica nanoparticles are prepared as follows: 0.5g polyvinylpyrrolidone is dissolved in a mixed solution of 40ml ethanol and 60ml deionized water, 1g dodecylamine Dissolve it in 5ml of absolute ethanol and add it, stir for 60min, add 5ml of tetraethyl orthosilicate, and stir at 40°C for 6h to form a white colloid, after centrifugal cleaning, dry at 100°C for 12h, after grinding, at Calcined for 4h to obtain porous silica nanoparticles;

[0050] (2) Add the prepared porous silica nanoparticles into a mixed solution of deionized water and ethanol with a volume ratio of 2:1, stir and dissolve, add low surface energy substances into it and stir for 2 hours to form a mixed solution A, and obtain a capsule core , wherein, 30g of porous silica nanoparticles, 30g of a mixed solution of deionized water...

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Abstract

The invention relates to a preparation method of a self-repairing microcapsule and its application in a superhydrophobic coating. The self-repairing microcapsules provided by the present invention use porous nanoparticles wrapped with low surface energy as the capsule core. The nanoscale porous particle structure can make the nanoparticles fill the cracks when the microcapsules are damaged by acid and alkali, and play the role of self-repair. The structure can increase the specific surface area of ​​the capsule core, increase the surface energy, and then the surface adsorption capacity is stronger, and can more easily adsorb low surface energy substances on the surface of the capsule core. When the pH of the microcapsule is 5‑9, it has better Self-healing effect; the wall of the microcapsule is made of a high molecular polymer, and through the synergistic effect of the core and the wall, when the structure of the wall is damaged, the surface of the core still has a relatively high roughness. The synergy with the capsule core can automatically repair the damaged super-hydrophobic surface.

Description

technical field [0001] The invention belongs to the technical field of superhydrophobic materials, and in particular relates to a preparation method of self-repairing microcapsules and its application in superhydrophobic coatings. Background technique [0002] The superhydrophobic surface (contact angle greater than 150° and rolling angle less than 10°) has excellent performance, so it has broad application prospects in many fields, such as self-cleaning, anti-corrosion, anti-icing, drag reduction, and antifouling. However, the artificial superhydrophobic surface has poor durability in actual use, and it is easy to lose superhydrophobic properties due to physical damage such as scratching and abrasion, which greatly limits the application of superhydrophobic materials. In addition, the coating is eroded by acid and alkali solutions. When damaged, the solution also loses its super-hydrophobic properties. Therefore, the super-hydrophobic material is endowed with self-healing p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02B01J13/14C09D133/04C09D7/62
CPCB01J13/02B01J13/14C08K2201/011C09D133/04C09D7/62C09D7/70C08K9/10C08K7/24C08K7/26
Inventor 郭思瑶罗惠华张素磊乔晓立陈际洲聂蕊万小梅
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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