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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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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., but most of them require special equipment and specific experiments. Conditions or expensive fluorosilicon compounds can only be processed in a small area, not suitable for preparing a large area

Method used

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  • 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
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Effect test

Embodiment 1

[0022] A SiO 2 The preparation method of the / PS composite superhydrophobic coating is as follows: 1.6g polystyrene is added into 40ml tetrahydrofuran, and magnetically stirred until the polystyrene is completely dissolved to obtain a transparent solution. Then add 2.0 g of DNS-2 nano-silica, ultrasonicate for 0.5 h, then add 1.0 g of γ-mercaptopropyltrimethoxysilane, and continue stirring for 3 h until the nano-silica is uniformly dispersed. Take the glass slide as the substrate, adjust the pulling speed of the vertical pulling machine to 318mm / min, pull to form a film, and let it air at room temperature for 1 hour.

[0023] The resulting SiO 2 The SEM and contact angle photos of / PS composite superhydrophobic coating can be found in figure 1 , the measured contact angle was 168.9±2°.

Embodiment 2

[0025] A SiO 2 The preparation method of the / PVC composite superhydrophobic coating is as follows: 1.6g of polyvinyl chloride is added to 50ml of tetrahydrofuran, and magnetically stirred until the polyvinyl chloride is completely dissolved to obtain a transparent solution. Then add 2.4g of DNS-2 nano-silica, sonicate for 0.5h, then add 1.0g of γ-mercaptopropyltrimethoxysilane, and continue stirring 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 to form a film, and let it air for 1 hour at room temperature.

[0026] The resulting SiO 2 / PVC composite superhydrophobic coating SEM and contact angle photos see figure 2 , the measured contact angle was 169.0±2°.

Embodiment 3

[0028] A SiO 2 / PMMA composite super-hydrophobic coating preparation method, specifically: 1.6g polymethyl methacrylate is added in 40ml tetrahydrofuran, magnetically stirred until the polymethyl methacrylate is completely dissolved, and a transparent solution is obtained. Then add 2.0 g of DNS-2 nano-silica, sonicate for 0.5 h, then add 1.0 g of γ-mercaptopropyltrimethoxysilane, and continue stirring for 3 h until the silica is evenly dispersed. Use filter paper as the base, adjust the pulling speed of the vertical pulling machine to 318mm / min, pull to form a film, and let it air for 1 hour at room temperature.

[0029] The resulting SiO 2 SEM and contact angle photos of PMMA / PMMA composite superhydrophobic coating can be found in image 3 , the measured contact angle was 167.6±2°.

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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.

Description

technical field [0001] The invention belongs to the technical field of application of inorganic nanomaterials, in particular to a SiO 2 The preparation method of / polymer composite superhydrophobic coating. Background technique [0002] In recent years, due to the broad application prospects of superhydrophobic surfaces in real life, the preparation of superhydrophobic materials has become a research hotspot. Superhydrophobic surfaces have attractive prospects in many fields such as waterproof clothing, self-cleaning glass, exterior wall coatings, pipe microflow, waterproofing, anti-corrosion, oil-water separation, and biomedical applications. There are many methods for preparing superhydrophobic surfaces reported so far: etching method, sol-gel method, electrochemical method, phase separation method, electrospinning method, etc., but most of them require special equipment and specific experiments. Conditions or expensive fluorosilicon compounds can only be processed in sma...

Claims

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Application Information

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IPC IPC(8): C09D125/06C09D127/06C09D123/06C09D133/12C09D7/12C08J5/18
Inventor 张霞朱文忠丁蓓陈恒真张平余张治军
Owner HENAN UNIVERSITY
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