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Simple method for preparing stable super-hydrophobic surface on polyvinylidene difluoride substrate

A technology of super-hydrophobic surface and polyvinylidene fluoride, applied in the direction of manufacturing tools, flat products, metal processing equipment, etc., can solve the problems of complex process, high cost, poor stability of super-hydrophobic surface and wide application, etc., to achieve simple process, good stability effect

Inactive Publication Date: 2013-01-02
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these preparation methods have many defects such as high cost, complicated process, and expensive instruments, and are not suitable for large-scale production.
In addition, the poor stability of superhydrophobic surface is also a major factor restricting its wide application.

Method used

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  • Simple method for preparing stable super-hydrophobic surface on polyvinylidene difluoride substrate
  • Simple method for preparing stable super-hydrophobic surface on polyvinylidene difluoride substrate
  • Simple method for preparing stable super-hydrophobic surface on polyvinylidene difluoride substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) The surface of a disc-shaped PVDF substrate with a thickness of 2 mm and a diameter of 20 mm was manually polished for 100 degrees under a pressure of 5000-6000 Pa using metallographic sandpaper marked 180# according to the "8"-shaped grinding route. times; then use anhydrous ethanol to clean, and dry naturally for later use;

[0014] (2) Soak the polished and clean PVDF substrate in an absolute ethanol solution with a PFOTS content of 1 wt% for 2 h at room temperature, then take out the sample, clean the surface with absolute ethanol, and dry it with nitrogen to obtain the target substrate. The static contact angle of water is 162±1.7°, and the PVDF superhydrophobic surface with rolling angle of 4.2±0.5°, as attached figure 2 And attached image 3 ;

[0015] (3) The stability test results of PVDF superhydrophobic samples are:

[0016] The samples prepared in step (2) were respectively immersed in cyclohexane, acetone, chloroform, toluene, and acetic acid for 2 ...

Embodiment 2

[0020] (1) Use metallographic sandpaper marked 200# on the surface of a disc-shaped PVDF substrate with a thickness of 2 mm and a diameter of 20 mm according to the "8"-shaped grinding route, and manually polish it under a pressure of 5000-6000 Pa for 200 times; then use anhydrous ethanol to clean, and dry naturally for later use;

[0021] (2) Soak the polished and clean PVDF substrate in an absolute ethanol solution with a PFOTS content of 1 wt% for 2 h at room temperature, then take out the sample, clean the surface with absolute ethanol, and dry it with nitrogen to obtain the target substrate. A PVDF superhydrophobic surface with a static contact angle of 163±1.5° and a rolling angle of 2.7±0.4° for water;

[0022] (3) The stability test results of PVDF superhydrophobic samples are:

[0023] At room temperature, the samples prepared in step (2) in Example 2 were respectively immersed in 1 mol / L of hydrochloric acid, 1 mol / L of nitric acid, 1 mol / L of sodium hydroxide solut...

Embodiment 3

[0027] (1) Use 320# metallographic sandpaper on the surface of a disc-shaped PVDF substrate with a thickness of 2 mm and a diameter of 20 mm according to the "8"-shaped grinding route, and manually polish it under a pressure of 5000-6000 Pa for 400 times; then use anhydrous ethanol to clean, and dry naturally for later use;

[0028] (2) Soak the polished and clean PVDF substrate in an absolute ethanol solution with a PFOTS content of 1 wt% for 2 h at room temperature, then take out the sample, clean the surface with absolute ethanol, and dry it with nitrogen to obtain the target substrate. A PVDF superhydrophobic surface with a static contact angle of 164±2.2° and a rolling angle of 3.4±0.4°;

[0029] (3) The stability test results of PVDF superhydrophobic samples are:

[0030] At room temperature, the samples prepared in step (2) of Example 3 were respectively immersed in 1 mol / L of hydrochloric acid, 1 mol / L of nitric acid, 1 mol / L of sodium hydroxide solution, and 1 mol / L ...

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Abstract

The invention relates to a simple method for preparing a stable super-hydrophobic surface on a polyvinylidene difluoride (PVDF) substrate. The method comprises the steps that: (1) according to an 8-shaped polishing route, the surface of a disk-shaped PVDF substrate with a thickness of 2mm and a diameter of 20mm is manually polished 80-900 times under a pressure of 5000-10000Pa by using a metallographic sandpaper with a grade of 180-2000#; the substrate is washed by using anhydrous ethanol; and the obtained substrate is naturally dried in air, and is preserved for later use; (2) under room temperature, the polished clean PVDF substrate is soaked for 2h in an anhydrous ethanol solution with a PFOTS content of 1wt%; the sample is fetched, and the surface of the sample is washed by using anhydrous ethanol; and the sample is blow-dried by using nitrogen, such that a PVDF super-hydrophobic surface with an static contact angle of 159.0-165.0 DEG and a rolling angle of 2.0-5.0 DEG with water is obtained. The method provided by the invention has the advantages of simple process, low requirement on processing equipment, and no strict requirement on substrate dimensions. With the method, the prepared PVDF super-hydrophobic surface has good stability.

Description

technical field [0001] The invention relates to a simple method for preparing a stable superhydrophobic surface on a polyvinylidene fluoride substrate. Background technique [0002] A superhydrophobic surface refers to a solid surface with a static contact angle of more than 150° to water and a rolling angle of less than 5°. This type of material has very broad application prospects in industrial and agricultural production and people's daily life. For example, super-hydrophobic interface materials are used for outdoor antennas, which can prevent snow accumulation, so as to ensure the reception of high-quality signals; when coated on the shell of ships and fuel storage tanks, they can achieve anti-fouling and anti-corrosion effects; Under the nuclear submarine, it can reduce the resistance of water and increase the driving speed; it can be used for the tip of a micro-syringe, which can completely eliminate the stickiness of expensive samples on the tip of the needle and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C37/00B24B19/22B29K27/12B29L7/00
Inventor 王法军薛名山欧军飞李文
Owner NANCHANG HANGKONG UNIVERSITY