Preparation method of SiO2/polymer combined superhydrophobic coating

A super-hydrophobic coating, polymer technology, applied in the direction of coating, can solve problems such as unsuitable large area, and achieve the effects of easy control, cheap raw materials, and simple operation

Inactive Publication Date: 2016-02-10
HENAN UNIVERSITY
4 Cites 18 Cited by

AI-Extracted Technical Summary

Problems solved by technology

There are many methods for preparing superhydrophobic surfaces reported so far: etching method, sol-gel method, electrochemical method, phase separation method, electrospinning method, etc., bu...
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Abstract

The invention discloses a preparation method of a SiO2/polymer combined superhydrophobic coating. The preparation method comprises the following steps: adding a polymer into an organic solvent, and stirring till the polymer is dissolved completely to obtain a transparent solution I; adding hydrophobic nano silicon dioxide and a coupling agent, continuing stirring or carrying out ultrasonic dispersion till hydrophobic nano silicon dioxide is dispersed uniformly, adopting a pulling film forming method to obtain a uniform superhydrophobic coating, and drying the superhydrophobic coating at room temperature to obtain the product, wherein the addition proportion of the polymer to the organic solvent, hydrophobic nano silicon dioxide and the coupling agent is 1.6g:(40 to 50ml):(2.0 to 2.4g):1.0g. The preparation method has the advantages that the operation is simple; the raw materials are cheap and highly available; the repeatability is high; the prepared product has the advantages of both the polymer and inorganic nano particles, and is excellent in performance; each contact angle between the prepared product and water is 160 degrees or above; the roll angle of a water droplet on the surface of the coating is equal to or smaller than 10 degrees; a film made of the coating is uniform and suitable for various substrates.

Application Domain

Technology Topic

Aqueous dropletSuperhydrophobe +7

Image

  • Preparation method of SiO2/polymer combined superhydrophobic coating
  • Preparation method of SiO2/polymer combined superhydrophobic coating
  • Preparation method of SiO2/polymer combined superhydrophobic coating

Examples

  • Experimental program(5)

Example Embodiment

[0021] Example 1
[0022] A kind of SiO 2 The preparation method of the /PS composite superhydrophobic coating is specifically as follows: adding 1.6 g of polystyrene to 40 ml of tetrahydrofuran, and magnetically stirring until the polystyrene is completely dissolved to obtain a transparent solution. Then add 2.0g DNS-2 type nano silica, ultrasonic for 0.5h, then add 1.0g γ-mercaptopropyltrimethoxysilane, and continue to stir for 3h until the nano silica is evenly dispersed. Take the glass slide as the substrate, adjust the pulling speed of the vertical pulling machine to 318mm/min, pull it into a film, and leave it in the air at room temperature for 1 hour.
[0023] SiO obtained 2 /PS composite superhydrophobic coating SEM and contact angle photos see figure 1 , The measured contact angle is 168.9±2°.

Example Embodiment

[0024] Example 2
[0025] A kind of SiO 2 The preparation method of the /PVC composite super-hydrophobic coating is specifically as follows: adding 1.6 g of polyvinyl chloride to 50 ml of tetrahydrofuran, and magnetically stirring until the polyvinyl chloride is completely dissolved to obtain a transparent solution. Then add 2.4g DNS-2 type nano silica, ultrasonic for 0.5h, then add 1.0g γ-mercaptopropyltrimethoxysilane, and continue stirring for 3h until the nano silica is evenly dispersed. Take the glass slide as the base, adjust the vertical pulling speed of the vertical pulling machine to 318mm/min, pull it into a film, and leave it in the air at room temperature for 1 hour.
[0026] SiO obtained 2 /PVC composite superhydrophobic coating SEM and contact angle photos see figure 2 , The measured contact angle is 169.0±2°.

Example Embodiment

[0027] Example 3
[0028] A kind of SiO 2 The preparation method of the /PMMA composite superhydrophobic coating is specifically: adding 1.6 g of polymethyl methacrylate to 40 ml of tetrahydrofuran, and magnetically stirring until the polymethyl methacrylate is completely dissolved to obtain a transparent solution. Then add 2.0 g DNS-2 type nano silica, ultrasonic for 0.5 h, then add 1.0 g γ-mercaptopropyl trimethoxysilane, and continue to stir for 3 h until the silica is uniformly dispersed. With filter paper as the base, adjust the vertical pulling machine to adjust the pulling speed to 318mm/min, pull it into a film, and leave it in the air at room temperature for 1 hour.
[0029] SiO obtained 2 /PMMA composite superhydrophobic coating SEM and contact angle photos see image 3 , The measured contact angle is 167.6±2°.
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Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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