Hydrophilic polyvinylidene fluoride modified separation membrane and preparation method thereof

A polyvinylidene fluoride and separation membrane technology, which is applied in the direction of semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of not being able to give full play to the role of modified materials and easy agglomeration, and achieve enhanced hydrophilicity and The effects of anti-pollution ability, increased contact area, and simple operation process

Inactive Publication Date: 2013-05-08
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high aspect ratio of carbon nanotubes and the π-π interaction between graphene sheets, the addition of oxidized carbon nanotubes or graphene oxide alone will make oxidized carbon nanotubes or graphene oxide extremely stable in solution and in polymers. Therefore, it is very important to find a method that can inhibit the agglomeration of low-dimensional carbon nanomaterials in solutions and polymers and give full play to their own advantages.

Method used

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  • Hydrophilic polyvinylidene fluoride modified separation membrane and preparation method thereof
  • Hydrophilic polyvinylidene fluoride modified separation membrane and preparation method thereof
  • Hydrophilic polyvinylidene fluoride modified separation membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Ultrasonic disperse 0.015g carbon dioxide nanotubes and 0.135g graphene oxide in 84g N-N dimethylacetamide, add 15g polyvinylidene fluoride and 1g polyvinylpyrrolidone after 2h, and then heat and stir in a water bath at 50°C for 24h to obtain Carbon dioxide nanotubes and graphene oxide are evenly dispersed in the casting solution, and the casting solution is left to defoam for 24 hours. At room temperature, use a self-made scraper to control a certain thickness of the liquid film and scrape the film on a clean glass plate. After the casting solution was volatilized in the air for 30s, it was immersed in deionized water to solidify, and the water was changed repeatedly to remove the polyvinylidene fluoride solvent and porogen, and finally the hydrophilic polyvinylidene fluoride modified separation membrane was prepared. .

[0024] In order to better reflect the changes in the hydrophilicity of the above-mentioned modified separation membrane, the inventors vacuum-dried t...

Embodiment 2

[0026] Ultrasonic disperse 0.09g of carbon nanotubes and 0.09g of graphene oxide in 80g of dimethylformamide, add 18g of polyvinylidene fluoride and 2g of polyethylene glycol after 1h, and then heat and stir in a water bath at 50°C for 30h to obtain Carbon dioxide nanotubes and graphene oxide are evenly dispersed in the casting solution, and the casting solution is left to defoam for 24 hours. At room temperature, use a self-made scraper to control a certain thickness of the liquid film and scrape the film on a clean glass plate. After the casting solution was volatilized in the air for 30s, it was immersed in deionized water to solidify, and the water was changed repeatedly to remove the polyvinylidene fluoride solvent and porogen, and finally the hydrophilic polyvinylidene fluoride modified separation membrane was prepared. .

[0027] After testing, the hydrophilic polyvinylidene fluoride modified separation membrane provided in this example has a contact angle of 45.38° to ...

Embodiment 3

[0029] Ultrasonic disperse 0.06g carbon nanotubes and 0.24g graphene oxide in 82g N-N dimethylacetamide, add 15g polyvinylidene fluoride and 3g sodium perchlorate after 2h, then heat and stir in a water bath at 50°C for 20h Obtain a casting solution in which carbon dioxide nanotubes and graphene oxide are uniformly dispersed, and leave the casting solution to defoam for 30 hours. At room temperature, use a self-made scraper to control a certain thickness of the liquid film and scrape the film on a clean glass plate. After scraping the film, The casting solution was volatilized in the air for 30s, then immersed in deionized water to solidify, and the water was changed repeatedly to remove the polyvinylidene fluoride solvent and porogen, and finally the hydrophilic polyvinylidene fluoride modified separation membrane.

[0030] After testing, the hydrophilic polyvinylidene fluoride modified separation membrane provided in this example has a contact angle of 42.36° to water. From...

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Abstract

The invention discloses a hydrophilic polyvinylidene fluoride modified separation membrane and a preparation method thereof. The separation membrane is prepared from polyvinylidene fluoride, a polyvinylidene fluoride solvent, a carbon oxide carbon nano tube / graphene oxide and a pore-forming agent. According to the hydrophilic polyvinylidene fluoride modified separation membrane, on one hand, hydrophilicity of the separation membrane is enhanced through oxygen-containing functional groups in the carbon oxide carbon nano tube and graphene oxide, on the other hand, graphene oxide of a sheet structure enters a carbon oxide carbon nano tube network of a tubular structure for mutual intercalation to form a stable sandwich layered structure, therefore, agglomeration of the same nano structure bodies can be effectively inhibited, and migration and assembly of graphene oxide to the surface of a composite membrane are facilitated, and the contact area of the carbon oxide carbon nano tube and graphene oxide and macromolecule matrix in the composite membrane is remarkably improved, and thus, the hydrophilicity and anti-pollution capacity of the membrane are enhanced, so that the water flux of the membrane is substantially improved. In addition, the preparation method is simple in operation technology and is easily carried out.

Description

technical field [0001] The invention belongs to the technical field of separation membrane modification, and in particular relates to a hydrophilic polyvinylidene fluoride modified separation membrane and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride has good thermal stability, chemical stability and mechanical strength, and is a separation membrane material with good comprehensive performance. At present, polyvinylidene fluoride hydrophilic ultrafiltration membranes have been successfully used in chemical, textile, food, biochemical and other industrial fields. However, due to the limitation of the hydrophobic property of polyvinylidene fluoride material itself, there are still problems such as the decrease of membrane hydrophilic penetration and poor anti-pollution ability in the application of membrane separation. Therefore, the hydrophilic modification of polyvinylidene fluoride membrane has become the main research direction of tho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/02
Inventor 徐志伟张继国吴腾飞周宝明李英琳李宝东牛家嵘钱晓明
Owner TIANJIN POLYTECHNIC UNIV
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