Self-cleaning coating material with persistent super-hydrophobicity and preparation method thereof

A technology of self-cleaning coating and super-hydrophobic coating, which is applied in the direction of antifouling/underwater coating, coating, paint containing biocide, etc., which can solve the problems of coating failure, waste of titanium dioxide particles, and coating durability etc. to achieve good durability, simple preparation method and operating equipment, and wide applicability

Inactive Publication Date: 2018-12-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] When the content is less than 100%, the coating cannot be superhydrophobic; when the content is greater than 150%, the durability of the coating will be affected, and it will cause waste of titanium dioxide particles

Method used

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  • Self-cleaning coating material with persistent super-hydrophobicity and preparation method thereof
  • Self-cleaning coating material with persistent super-hydrophobicity and preparation method thereof
  • Self-cleaning coating material with persistent super-hydrophobicity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Superhydrophobic coating preparation: Weigh 0.8g and 0.08g polydimethylsiloxane Dow Corning184A component and B component (ie prepolymer A and curing agent B) respectively, and stir to make the two fully mix. Add 2.4 g of hexane and 4.8 g of absolute ethanol to the mixture, and ultrasonically disperse at room temperature for 10 min to fully dissolve the mixture in the hexane-absolute ethanol mixed solvent. Afterwards, 0.8 g of nano-titanium dioxide particles were added to the solution, the solution was shaken, magnetically stirred for 10 minutes, and then ultrasonically dispersed for 10 minutes to obtain a superhydrophobic coating.

[0042] 2) Spray the obtained coating on the glass substrate with a 3mm caliber spray gun and heat it at 120° C. for 40 minutes to obtain a superhydrophobic spray coating.

[0043] The obtained superhydrophobic coating of the embodiment example 1 of the present invention can keep the liquid of different kinds on its surface spherical ( ...

Embodiment 2

[0045] 1) Superhydrophobic coating preparation: Weigh 0.8g and 0.08g of polydimethylsiloxane Dow Corning 184A component and B component, respectively, and stir to make the two fully mixed. Add 1.6 g of hexane and 3.2 g of absolute ethanol to the mixture, and ultrasonically disperse at room temperature for 10 min to fully dissolve the mixture in the hexane-absolute ethanol mixed solvent. Afterwards, 0.8 g of nano-titanium dioxide particles were added to the solution, the solution was shaken, magnetically stirred for 10 minutes, and then ultrasonically dispersed for 10 minutes to obtain a superhydrophobic coating.

[0046] 2) The obtained coating is sprayed on a glass substrate by a 3mm caliber spray gun and heated at 120° C. for 40 minutes to obtain a superhydrophobic spray coating.

Embodiment 3

[0048] 1) Superhydrophobic coating preparation: Weigh 0.8g and 0.08g of polydimethylsiloxane Dow Corning 184A component and B component, respectively, and stir to make the two fully mixed. Add 2.4 g of hexane and 4.8 g of absolute ethanol to the mixture, and ultrasonically disperse at room temperature for 10 min to fully dissolve the mixture in the hexane-absolute ethanol mixed solvent. Afterwards, 0.8 g of nano-titanium dioxide particles were added to the solution, the solution was shaken, magnetically stirred for 10 minutes, and then ultrasonically dispersed for 10 minutes to obtain a superhydrophobic coating.

[0049] 2) The obtained coating was sprayed on four different substrates of cotton cloth, silicon wafer, rubber, and paper through a 3mm caliber spray gun, and heated at 120°C for 40 minutes to obtain a superhydrophobic spray coating.

[0050] as attached image 3 As shown, methylene blue dyed water drops on cotton cloth ( image 3 a), rubber ( image 3 b), silicon...

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Abstract

The invention relates to a self-cleaning coating material with persistent super-hydrophobicity and a preparation method thereof. The content of titanium dioxide nanoparticles is 100 to 150 percent ofthe content of polydimethylsiloxane. The super-hydrophobic coating disclosed by the invention has the following advantages: (1) the coating preparation method and operating equipment are simple, a spraying method is adopted to prepare the super-hydrophobic coating, and thereby mass production is benefited; (2) applicability is wide, and the self-cleaning coating material is applicable to various solid substrates, including metal, glass, plastic, rubber and the like, and can be used as coating for external walls of buildings, anti-rusting surface coating for metal and the like; (3) with good durability, the self-cleaning coating material still has super-hydrophobicity after being irradiated by an ultraviolet lamp (wavelength is 365 nm) for seven days or placed outdoors for three months; (4)not only can water drops be utilized to bring away dust falling on the surface, but also the photocatalytic property of titanium dioxide can degrade oily organic pollutant on the surface, and therebythe coating has long super-hydrophobicity.

Description

technical field [0001] The invention belongs to the field of new chemical materials, in particular to a self-cleaning coating material with durable superhydrophobicity and a preparation method thereof. Background technique [0002] In recent years, superhydrophobic surfaces have attracted the attention of researchers because of their broad application prospects. Multiscale structure and low surface energy substances are two key factors to obtain superhydrophobicity 1-2 , therefore, two techniques can be used to obtain superhydrophobic surfaces: forming rough surfaces on low surface energy materials, or modifying rough surfaces with low surface energy materials. Because of its superhydrophobicity, this surface exhibits excellent self-cleaning performance, which has good application prospects in industrial production and biomedicine, such as coatings for building exterior walls and interior walls, frost-resistant windows , oil-water separation and anti-bacterial adhesion in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C09D5/16
CPCC09D183/04C08K2003/2241C08K2201/011C09D5/1675C09D5/1687C08K3/22
Inventor 刘丹汪颖王亚玲
Owner WUHAN UNIV OF TECH
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