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Multi-walled composite conductive carbon nanotube-polyvinylidene fluoride ultrafiltration membrane and preparation method thereof

A kind of technology of multi-wall carbon nanotube and polyvinylidene fluoride

Inactive Publication Date: 2014-05-14
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the addition of carbon nanotubes, the material has a very low percolation threshold and high conductivity, but the material is molded at high temperature, the preparation process is complicated, and it cannot be used to solve the problems of water treatment of separation membranes.
At present, there is no composite conductive ultrafiltration membrane that can combine the conductivity and the hydrophilicity of the separation membrane well, and better solve the problem of membrane fouling in the treatment of water-based systems.

Method used

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  • Multi-walled composite conductive carbon nanotube-polyvinylidene fluoride ultrafiltration membrane and preparation method thereof
  • Multi-walled composite conductive carbon nanotube-polyvinylidene fluoride ultrafiltration membrane and preparation method thereof
  • Multi-walled composite conductive carbon nanotube-polyvinylidene fluoride ultrafiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 0.18g of carboxylated multi-walled carbon nanotubes (with an aspect ratio of 500-3000:1) to 42g of N-N dimethylacetamide and disperse ultrasonically for 1 hour through an ultrasonic cleaner, then put them into a cell pulverizer for ultrasonic dispersion Half an hour, then add 6g of polyvinylidene fluoride, stir magnetically in a constant temperature water bath at 60°C for 5 hours, then ultrasonically disperse for 2 hours with an ultrasonic cleaner, then put it into a cell pulverizer for ultrasonic dispersion for 1 hour, and finally place it at 35°C After standing in a vacuum drying oven for 2 hours for degassing, scrape a film with a uniform thickness on a glass plate at room temperature. After repeated washing with water, soak in new deionized water for 48 hours, soak the membrane in absolute ethanol for 48 hours, take it out, rinse it with deionized water repeatedly, and finally dry the cleaned membrane in a vacuum at 40 °C After oven drying, the film performance ...

Embodiment 2

[0031] Add 0.35g of carboxylated multi-walled carbon nanotubes (with an aspect ratio of 500-3000:1) into 40g of N-N dimethylacetamide and disperse ultrasonically for 1 hour with an ultrasonic cleaner, then put them into a cell pulverizer for ultrasonic dispersion Half an hour, then add 7g of polyvinylidene fluoride, stir magnetically in a constant temperature water bath at 60°C for 5 hours, then ultrasonically disperse for 2 hours with an ultrasonic cleaner, then put it into a cell pulverizer for ultrasonic dispersion for 1 hour, and finally place it at 35°C After standing in a vacuum drying oven for 2 hours for degassing, scrape a film with a uniform thickness on a glass plate at room temperature. After repeated washing with water, soak in new deionized water for 48 hours, soak the membrane in absolute ethanol for 48 hours, take it out, rinse it with deionized water repeatedly, and finally dry the cleaned membrane in a vacuum at 40 °C After oven drying, the film performance c...

Embodiment 3

[0033] Add 0.5g (length-diameter ratio: 500-3000:1) carboxylated multi-walled carbon nanotubes to 60g N-N dimethylacetamide, ultrasonically disperse for 1 hour through an ultrasonic cleaner, and then put into a cell pulverizer for ultrasonic dispersion After half an hour, add 5g of polyvinylidene fluoride, stir magnetically in a constant temperature water bath at 60°C for 5 hours, then ultrasonically disperse for 2 hours with an ultrasonic cleaner, then put it into a cell pulverizer for ultrasonic dispersion for 1 hour, and finally place it at 35°C After standing in a vacuum drying oven for 2 hours for degassing, scrape a film with a uniform thickness on a glass plate at room temperature. After repeated washing with water, soak in new deionized water for 48 hours, soak the membrane in absolute ethanol for 48 hours, take it out, rinse it with deionized water repeatedly, and finally dry the cleaned membrane in a vacuum at 40 °C After oven drying, the film performance can be test...

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Abstract

The invention provides a multi-walled composite conductive carbon nanotube-polyvinylidene fluoride ultrafiltration membrane and a preparation method thereof. The multi-walled composite conductive carbon nanotube-polyvinylidene fluoride ultrafiltration membrane is prepared from polyvinylidene fluoride, N-N-dimethylacetamide and multi-walled carbon nanotubes. According to the conductive ultrafiltration membrane, the insulated polyvinylidene fluoride serves as a film-forming matrix, the carboxylated multi-walled carbon nanotubes serve as a nano conductive filler, the multi-walled carbon nanotubes are uniformly dispersed in the matrix by adopting an ultrasonic dispersion method, and the multi-walled composite conductive carbon nanotube-polyvinylidene fluoride ultrafiltration membrane is prepared by adopting a wet-phase inversion method. Because the carbon nanotubes have the extremely high conductivity, the conductive performance of the composite membrane is well improved due to the addition of the carbon nanotubes, and the strength and the hydrophilicity of the membrane are enhanced. Therefore, the membrane can be effectively prevented from being polluted during water treatment, and the service life of the membrane is prolonged. The preparation method and a process flow are simple, the operation is convenient, the cost is low, equipment is not required to be transformed, and the operability is high.

Description

technical field [0001] The invention not only belongs to the technical field of separation membrane modification, but also belongs to the technical field of polymer-based conductive composite materials, in particular to a multi-walled carbon nanotube-polyvinylidene fluoride composite conductive ultrafiltration membrane and a preparation method thereof. technical background [0002] Polyvinylidene fluoride (PVDF) is a widely used polymer material with excellent performance. Its outstanding advantages are: excellent dielectric properties, piezoelectric properties, pyroelectric properties, high chemical stability, corrosion resistance, Oxidation resistance, abrasion resistance, good flexibility and cheap raw materials make it develop rapidly in the field of membrane separation, but due to the low surface energy of PVDF itself and its strong hydrophobicity, it is easy to be polluted, which limits PVDF Applications of microfiltration and ultrafiltration membranes in water-based s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/12B01D69/02
Inventor 王文一高宁宁李艳玲刘正鑫
Owner TIANJIN POLYTECHNIC UNIV
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