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Polyvinylidene fluoride-carbon nano tube composite separation film and preparation method thereof

A carbon nanotube composite and polyvinylidene fluoride technology, which is applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc. Poor combination and other problems, to achieve the effect of improving pollution resistance, pure water flux, and strength

Inactive Publication Date: 2012-08-01
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of these three-dimensional inorganic particles is that it is not easy to be functionalized, and the interface binding with PVDF is relatively poor, which leads to insufficient spatial connection of the membrane, which affects the service life of the membrane and the effect of hydrophilic modification.

Method used

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  • Polyvinylidene fluoride-carbon nano tube composite separation film and preparation method thereof
  • Polyvinylidene fluoride-carbon nano tube composite separation film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 0.2 g of multi-walled carbon nanotubes (average aspect ratio of 100:1, surface oxygen content of 6%) were ultrasonically dispersed in 70 g of N-N dimethylacetamide for 2.5 h, and then 18 g of polyvinylidene fluoride and 3g of polyvinylpyrrolidone, then mechanically stirred for 24 hours, left to stand for degassing at room temperature for 24 hours, scraped the film on a clean glass plate with a scraper, pre-evaporated the film for 30 seconds, then immersed it in deionized water until it solidified, and then rinsed it repeatedly with deionized water It is cleaned to remove solvent and porogen, and then polyvinylidene fluoride-carbon nanotube composite flat microfiltration membrane can be made.

[0022] Soak the above-mentioned polyvinylidene fluoride-carbon nanotube composite flat microfiltration membrane in deionized water for 3 to 4 days, then perform performance test after vacuum drying, and compare with pure polyvinylidene fluoride membrane. The test structure shows th...

Embodiment 2

[0023] Example 2: 0.1g of multi-walled carbon nanotubes (average aspect ratio of 500:1, surface oxygen content of 4%) was placed in 60g of N-N dimethylacetamide for ultrasonic dispersion for 2h, and then 15g of polybias was added Vinyl fluoride and 2g polyvinylpyrrolidone, then mechanically stirred for 24 hours, left to stand for degassing at room temperature for 24 hours, scraped the film on a clean glass plate with a scraper, pre-evaporated the film for 30 seconds, then immersed it in deionized water until it solidified, and then used it repeatedly After rinsing with ion water to remove solvent and porogen, the polyvinylidene fluoride-carbon nanotube composite flat microfiltration membrane can be prepared.

[0024] Soak the above-mentioned polyvinylidene fluoride-carbon nanotube composite flat microfiltration membrane in deionized water for 3 to 4 days, then perform performance test after vacuum drying, and compare with pure polyvinylidene fluoride membrane. The test structur...

Embodiment 3

[0026] 0.4g of multi-walled carbon nanotubes (with an average aspect ratio of 200:1 and a surface oxygen content of 5%) were ultrasonically dispersed in 80g of N-N dimethylacetamide for 3h, and then 20g of polyvinylidene fluoride and 3g of Polyvinylpyrrolidone, followed by mechanical stirring for 24 hours, standing at room temperature for 24 hours to defoam, use a scraper to scrape the film on a clean glass plate, pre-evaporate the film for 30 seconds, immerse it in deionized water until it solidifies, and then rinse it with deionized water repeatedly The polyvinylidene fluoride-carbon nanotube composite flat microfiltration membrane can be prepared by removing the solvent and the porogen.

[0027] Soak the above-mentioned polyvinylidene fluoride-carbon nanotube composite flat microfiltration membrane in deionized water for 3 to 4 days, then perform performance test after vacuum drying, and compare with pure polyvinylidene fluoride membrane. The test structure shows that pure p...

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Abstract

The invention discloses a polyvinylidene fluoride-carbon nano tube composite separation film and a preparation method thereof. The separation film consists of the following components in part by weight: 10 to 20 parts of polyvinylidene fluoride, 60 to 80 parts of N-N dimethyl acetamide, 0.1 to 3 parts of carbon nano tube and 2 to 5 parts of polyvinyl pyrrolidone. The method for preparing the polyvinylidene fluoride-carbon nano tube composite separation film comprises the following steps of: uniformly dispersing carbon nano tubes in the polyvinylidene fluoride by an ultrasonic and mechanical stirring method, and finally preparing a carbon nano tube-doped polyvinylidene fluoride composite film by a wet-phase inversion method. Due to the carbon nano tubes, the surface energy of the polyvinylidene fluoride can be well improved, the hydrophilicity of the film is improved, and the pollution resistance of the film is improved, so that pure water flux of the film is greatly improved; and moreover, the original excellent properties of the polyvinylidene fluoride are not influenced by the carbon nano tubes, the spatial association of the film is improved, the strength of the film is improved, and the service life of the film is prolonged. The preparation method is simple in process and convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of separation membrane modification, in particular to a polyvinylidene fluoride-carbon nanotube composite separation membrane and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride membrane (PVDF) is a kind of polymer separation membrane with excellent performance. Its ultrafiltration and microfiltration membranes have been successfully applied in the fields of chemical industry, food and water treatment. However, in the application process of PVDF, its application in water-based systems is limited due to its strong hydrophobicity and easy contamination. Therefore, research on the modification of PVDF is needed to broaden its application fields. In recent years, seeking a hydrophilic modification method for PVDF has become a research hotspot. Among them, the organic-inorganic hybrid modification method has simple operation process, low cost, and thorough modification, so it...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/34
Inventor 徐志伟赵玉芬王春红王震李宝东杨彩云钱晓明
Owner TIANJIN POLYTECHNIC UNIV
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