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Film with self-cleaning property and preparation method thereof

A self-cleaning, high-performance technology, applied in the field of super-hydrophobic film and its preparation, can solve the problems of being unsuitable for large-scale processing and cumbersome preparation methods, and achieve the effects of low cost, simple and controllable process, and simple process

Inactive Publication Date: 2018-01-26
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above preparation methods of hydrophobic membranes all use modification methods, but these preparation methods are relatively cumbersome and even require special instruments, which are not suitable for large-scale processing

Method used

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  • Film with self-cleaning property and preparation method thereof
  • Film with self-cleaning property and preparation method thereof
  • Film with self-cleaning property and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Put polyvinylidene fluoride and nano-silica (particle size 1~100nm) in a vacuum oven at 100°C for 24 hours; take 0.2g of dried nano-silica and add it to 17.0g dimethyl sulfoxide 40KHZ ultrasonic vibration for 3 hours to form a dispersion, add 2.0g of dried polyvinylidene fluoride, 0.4g of acetone and 0.4g of lithium chloride to the dispersion in turn, stir on a magnetic stirrer for 6h, and stir until the temperature is 80°C , to form a casting solution, let it stand for 9 hours for degassing, and set aside;

[0049](2) Make a flat film from the defoamed casting solution by using a film-making process, apply the casting solution on a clean glass plate with a mechanical film coater, let it stand in the air for 20 seconds, and then put it in a 20°C Stand in the coagulation bath for 1 hour to remove the film, soak the peeled film in deionized water at 25°C for 18 hours, then take it out and dry it with a hair dryer, and then put the film in 15 μl of 1H, 1H, 2H, 2H-perfl...

Embodiment 2

[0055] (1) Put polyvinylidene fluoride and nano-silica (particle size 1~100nm) in a vacuum oven at 100°C for 24 hours; take 0.2g of dried nano-silica and add it to 16.1g of dimethyl sulfoxide , 40KHZ ultrasonic vibration for 5 hours to form a dispersion, sequentially add 2.5g of dried polyvinylidene fluoride, 0.4g of acetone and 0.8g of polyethylene glycol to the dispersion, stir on a magnetic stirrer for 6h, and stir to a temperature of 80 ℃, until the casting solution is formed, let it stand for 12 hours for defoaming, and set aside;

[0056] (2) Make a flat film from the defoamed casting solution by using a film-making process, apply the casting solution on a clean glass plate with a scraper knife, let it stand in the air for 30s, and then put it in a solidification machine at 20°C Stand in the bath for 2 hours to remove the film, soak the peeled film in deionized water at 25°C for 24 hours, then take it out and dry it with a hair dryer, and then put the film in 15 μl of 1H...

Embodiment 3

[0060] (1) Put polyvinylidene fluoride and nano-silica (with a particle size of 1-100nm) in a vacuum oven at 100°C for 24 hours; take 0.8g of dried nano-silica and add it to 15.1g of dimethylformamide 30KHZ ultrasonic vibration for 5 hours to form a dispersion, add 3.0g of dried polyvinylidene fluoride, 0.6g of acetone and 0.5g of polyethylene glycol to the dispersion in turn, stir on a magnetic stirrer for 8 hours, and stir until the temperature is 80 ℃, until the casting solution is formed, let it stand for 12 hours for defoaming, and set aside;

[0061] (2) Make a flat film from the defoamed casting solution by using a film-making process, apply the casting solution on the non-woven fabric with a mechanical film coating machine, let it stand in the air for 50 seconds, and then put it in a 30°C Stand in the coagulation bath for 2 hours to remove the film, put the peeled film in deionized water at 25°C for 24 hours, then take it out and dry it with a hair dryer, and then put ...

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Abstract

The invention discloses a film with a self-cleaning property and a preparation method thereof. The method comprises the following steps: selecting a high-molecular polymer as a substrate; using a solvent compatible with high-molecular polymer for dissolving the high-molecular polymer; taking a nanometer filler as a hydrophobic group introducing source; forming a dispersing solution with the solvent by adopting an ultrasonic auxiliary physical blending method; adding cosolvent and additive; and lastly, adopting a low surface energy reagent for modifying and forming a super-hydrophobic surface.According to the invention, the preparation method is simple in process and low in cost; the operation process is controllable; the preparation method is simple and convenient; the maximal contact angle between the film with the self-cleaning property and water reaches up to 160 degrees and the minimal rolling angle is at 2 degrees; the film has a self-cleaning function, is high in water flux, hasexcellent mechanical properties and durability and can be applied to the dehumidification or seawater desalination.

Description

technical field [0001] The invention relates to the field of self-cleaning films, in particular to a superhydrophobic film with self-cleaning performance and a preparation method thereof. Background technique [0002] In daily life, we will find many interesting phenomena, such as when water droplets fall on the surface of lotus leaves, a small water drop will form on the surface and then fall; similarly, there are butterfly wings, when the butterfly wings flap, Water droplets will not wet the butterfly's body; there are also water striders that can walk and even jump easily on the water surface, etc. This all reflects the self-cleaning effect, that is, superhydrophobicity. It is usually defined that the surface with a contact angle between a material and water greater than 150° and a rolling angle less than 5° is called a superhydrophobic surface. This surface has excellent characteristics such as hydrophobicity and self-cleaning, which is the so-called "lotus leaf effect...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/06B01D69/08B01D53/22B01D53/26C02F1/44C02F103/08
CPCY02A20/131
Inventor 张立志段超邵育清李雷
Owner SOUTH CHINA UNIV OF TECH
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