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

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

Example Embodiment

[0047] Example 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 ...

Example Embodiment

[0054] Example 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...

Example Embodiment

[0059] Example 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 ...

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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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