A preparation method of superhydrophobic coating based on self-assembly of polydopamine

A super-hydrophobic coating, polydopamine technology, applied in coatings, antifouling/underwater coatings, anti-corrosion coatings, etc., can solve the problems of poor oxidant and hydrophobic modification effect, achieve good chemical stability and broad application prospects Effect

Active Publication Date: 2022-04-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of using a large amount of oxidants harmful to the environment and poor hydrophobic modification effect in the existing oxidant-induced polydopamine deposition method, and provide a method for preparing superhydrophobic coatings based on polydopamine self-assembly

Method used

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  • A preparation method of superhydrophobic coating based on self-assembly of polydopamine

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] The concrete steps of the preparation method of superhydrophobic coating in the present embodiment are as follows:

[0026] (1) Ultrasonic degrease the glass slides in ethanol for 30 minutes, wash them three times with deionized water, and then place them in a blast oven at 80°C for 2 hours to dry for later use.

[0027] (2) Weigh 6.057g of Tris in a beaker, add an appropriate amount of ultrapure water to dissolve it, transfer it to a 1L volumetric flask, and adjust the pH to 8.5 with hydrochloric acid to obtain Tris-hydrochloric acid buffer.

[0028] (3) Take by weighing 0.1g dopamine hydrochloride and 0.014g nanometer zero-valent iron in a 100mL beaker, add 50mL of tris-hydrochloric acid buffer solution prepared by step (2), and magnetically stir it to fully dissolve it to obtain mixture.

[0029] (4) Immerse the glass slide in the mixed solution obtained in step (3) for deposition for 4 hours, accompanied by magnetic stirring at the stirring speed of 200r·min -1 ,...

Embodiment 2

[0034] The concrete steps of the preparation method of superhydrophobic coating in the present embodiment are as follows:

[0035] (1) Ultrasonic degrease the glass slides in ethanol for 30 minutes, wash them three times with deionized water, and then place them in a blast oven at 80°C for 2 hours to dry for later use.

[0036] (2) Weigh 6.057g of Tris in a beaker, add an appropriate amount of ultrapure water to dissolve it, transfer it to a 1L volumetric flask, and adjust the pH to 8.5 with hydrochloric acid to obtain Tris-hydrochloric acid buffer.

[0037] (3) Take by weighing 0.1g dopamine hydrochloride, 0.014g nanometer zero-valent iron in a 100mL beaker, add 50mL of tris-hydrochloric acid buffer solution prepared by step (2), and magnetically stir it to fully dissolve it to obtain mixture.

[0038] (4) Immerse the glass slide in the mixed solution obtained in step (3) for deposition for 1 h, accompanied by magnetic stirring at a stirring speed of 100 r min -1 , take ou...

Embodiment 3

[0043] The concrete steps of the preparation method of superhydrophobic coating in the present embodiment are as follows:

[0044] (1) Ultrasonic degrease the glass slides in ethanol for 30 minutes, wash them three times with deionized water, and then place them in a blast oven at 80°C for 2 hours to dry for later use.

[0045] (2) Weigh 6.057g of Tris in a beaker, add an appropriate amount of ultrapure water to dissolve it, transfer it to a 1L volumetric flask, and adjust the pH to 8.5 with hydrochloric acid to obtain Tris-hydrochloric acid buffer.

[0046] (3) Take by weighing 0.1g dopamine hydrochloride, 0.014g nanometer zero-valent iron in a 100mL beaker, add 50mL of tris-hydrochloric acid buffer solution prepared by step (2), and magnetically stir it to fully dissolve it to obtain mixture.

[0047](4) Immerse the glass slide in the mixed solution obtained in step (3) for deposition for 4 hours, accompanied by magnetic stirring at the stirring speed of 180r min -1 , tak...

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Abstract

The invention discloses a method for preparing a superhydrophobic coating based on self-assembly of polydopamine. The specific steps are as follows: dissolving dopamine hydrochloride and nanometer zero-valent iron in tris-hydrochloric acid buffer to obtain a mixed solution; The molar concentrations of dopamine hydrochloride and nanometer zero-valent iron in the mixed solution are both 1 to 50 mM; at room temperature, the material to be coated is immersed in the mixed solution so that the two are fully contacted; The material is taken out, washed and dried; the material obtained in step S3 is immersed in a low surface energy modifier to make the two fully contact, after washing and drying, a superstructure based on polydopamine self-assembly is obtained on the surface of the material to be coated. Hydrophobic coating. The static water contact angle of the coating obtained in the present invention can reach up to 160.5°, and the minimum rolling angle can reach below 1°, and has excellent superhydrophobicity. with broadly application foreground.

Description

technical field [0001] The invention belongs to the technical field of preparation of surface superhydrophobic modification, in particular to a method for preparing a superhydrophobic coating based on polydopamine self-assembly. Background technique [0002] A superhydrophobic surface refers to a surface with a static contact angle of more than 150° and a rolling angle of less than 10° with water droplets. Since the self-cleaning and super-hydrophobic properties of the lotus leaf surface were discovered, the academic community has conducted a lot of research on super-hydrophobicity, and has been applied to self-cleaning, anti-corrosion, anti-fog, anti-icing, anti-fouling, biomedicine, oil-water separation, etc. field. [0003] The construction of the superhydrophobic surface mainly includes two key factors: the micro-nano structure of the imitation lotus leaf surface and the low surface energy components. Common construction methods include dipping, spraying, etching, chem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D179/04C09D5/00C09D5/16C09D5/08B05D5/00B05D7/24
CPCC09D179/04C09D5/00C09D5/1662C09D5/08B05D7/24B05D5/00
Inventor 郑豪姜睿涛陈建芳周珠贤
Owner ZHEJIANG UNIV
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