Preparation method of super-hydrophobic coating based on polydopamine self-assembly

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

Active Publication Date: 2021-08-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparation method of super-hydrophobic coating based on polydopamine self-assembly

Examples

Experimental program
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 preparation method of a super-hydrophobic coating based on polydopamine self-assembly, which comprises the specific steps of dissolving dopamine hydrochloride and nano zero-valent iron in a tris (hydroxymethyl) aminomethane-hydrochloric acid buffer solution to obtain a mixed solution, wherein the molar concentrations of the dopamine hydrochloride and the nano zero-valent iron in the mixed solution are both 1-50 mM; dipping a material to be coated into the mixed solution at room temperature, and enabling the material to be coated and the mixed solution to be in full contact; taking out the material obtained after dipping in the step S2, washing and drying; and soaking the material obtained in the step 3 in a low-surface-energy modifier, enabling the material and the low-surface-energy modifier to make full contact, and after cleaning and drying are conducted, obtaining the super-hydrophobic coating based on polydopamine self-assembly on the surface of the material to be coated. The static water contact angle of the obtained coating can reach 160.5 degrees to the maximum, the rolling angle can reach 1 degree or below to the minimum, and the coating has excellent super-hydrophobicity and has wide application prospects in the fields of composite material preparation, self-cleaning, oil-water separation, marine corrosion prevention, antifouling and the like.

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 Applications(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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