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Preparation method of polymer/inorganic nano-material composite ultrafiltration membrane

A technology of inorganic nanomaterials and polymers, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems that the hydrophilic effect cannot be fully exerted and cannot be concentrated

Inactive Publication Date: 2014-10-29
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the dispersion of inorganic nanomaterials in the casting solution, the inorganic nanomaterials are mostly embedded in the membrane matrix after scraping the membrane, and cannot be effectively "concentrated" on the membrane surface, and the hydrophilic effect cannot be fully exerted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 0.1 g graphene oxide / TiO 2 / Fe 3 o 4 Nanocomposites were ultrasonically dispersed in 79 grams of N-N dimethylformamide, 18.9 grams of polyvinylidene fluoride and 2 grams of polyethylene glycol were added after 2 hours, and then heated and stirred in a water bath at 45 °C for 24 hours to obtain graphene oxide / TiO 2 / Fe 3 o 4 Disperse the casting solution evenly, let the casting solution stand for defoaming; place the glass plate in an orthogonal magnetic field (magnetic field strength 20,000 gauss), then pour the casting solution on the glass plate to scrape the film, and after 45 seconds, it will be exposed to the magnetic field Put it in deionized water for coagulation, take out the membrane after 20 minutes and soak it in deionized water for 24 hours to obtain polyvinylidene fluoride-graphene oxide / TiO 2 / Fe 3 o 4 Composite ultrafiltration membrane. After testing, the polyvinylidene fluoride-graphene oxide / TiO provided in this example 2 / Fe 3 o 4 The conta...

Embodiment 2

[0018] 0.5 g TiO 2 / CoFe 2 o 4 Nanocomposites were ultrasonically dispersed in 78 g of N-methylpyrrolidone, 19 g of polyurethane and 2.5 g of polyvinylpyrrolidone were added after 2 hours, and then heated and stirred in a water bath at 50 °C for 24 hours to obtain TiO 2 / CoFe 2 o 4 Evenly dispersed casting solution, let the casting solution stand for defoaming; arrange the polypropylene nonwoven in an orthogonal magnetic field (magnetic field strength 18000 gauss), then pour the casting solution on the non-woven fabric and scrape the film, after 30 seconds Put it into 5% N-N dimethylacetamide aqueous solution under the action of a magnetic field to solidify, take out the film after 25 minutes and soak it in deionized water for 24 hours to obtain polyurethane-TiO 2 / CoFe 2 o 4 Composite ultrafiltration membrane. After testing, the polyurethane-TiO provided by this embodiment 2 / CoFe 2 o 4 The contact angle of the composite ultrafiltration membrane to water is 53.3°. ...

Embodiment 3

[0020] 1 g graphene oxide / Fe 3 o 4 Nanocomposites were ultrasonically dispersed in 80 g of N-N dimethylacetamide, 17 g of polyacrylonitrile and 2 g of polyvinylpyrrolidone were added after 2 hours, and then heated and stirred in a water bath at 50 °C for 24 hours to obtain graphene oxide / Fe 3 o 4 Disperse the casting solution evenly, let the casting solution stand for defoaming; place the glass plate in an orthogonal magnetic field (magnetic field strength 15000 gauss), then pour the casting solution on the glass plate to scrape the film, after 30 seconds, it will be exposed to the magnetic field Put it in deionized water for coagulation, take out the membrane after 15 minutes and soak it in deionized water for 24 hours to obtain polyacrylonitrile-graphene oxide / Fe 3 o 4 Composite ultrafiltration membrane. After testing, the polyacrylonitrile-graphene oxide / Fe provided by this embodiment 3 o 4 The contact angle of the composite ultrafiltration membrane to water is 48.8°....

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Abstract

The invention relates to a preparation method of a polymer / inorganic nano-material composite ultrafiltration membrane. The preparation method comprises the steps of firstly, taking polymer, a solvent, an additive and inorganic nano-composite material according to weight parts to prepare film casting liquid; then, putting the membrane casting liquid into the magnetic field, scraping the membrane, and solidifying; finally, taking the membrane out from coagulating bath, washing, soaking, and drying to obtain the polymer / inorganic nano-material composite ultrafiltration membrane. The preparation method has the beneficial effects that the inorganic nano-composite material with magnetism is synthesized; the nano-composite material transfers towards the surface of the ultrafiltration membrane in the membrane scraping process and the phase inversion process when being applied with the action of the applied magnetic field, so that the problem that when the ultrafiltration membrane is mixed with and modified by the inorganic nano-material, the nano-material is usually buried in the matrix, so that the hydrophilic modification effect of the nano-material can not be fully exerted can be solved. After the preparation method is adopted, the hydrophilia of the surface of the membrane is remarkably improved, and the contamination resistance of the membrane is improved. Furthermore, the preparation method is simple in operation technology and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of separation membrane modification, and in particular relates to a preparation method of a polymer / inorganic nanometer composite ultrafiltration membrane. Background technique [0002] Organic polymer has good chemical stability and thermal stability, and is a kind of separation membrane material with excellent comprehensive performance. At present, polymer ultrafiltration and microfiltration membranes have been successfully applied in the fields of chemical industry, textile, food and water treatment. However, due to its low surface energy and strong hydrophobicity, it is easy to cause surface contamination, which seriously affects the performance of the product. In recent years, in view of the problem of easy fouling of polymer separation membranes, the research on its hydrophilic modification has become increasingly active. Among them, the blending modification method is easy to operate, does not requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D71/42B01D71/68B01D71/54B01D71/30B01D69/12B01D67/00
Inventor 徐志伟吴腾飞曾艳钱晓明周宝明石睫刘梁森牛家嵘
Owner TIANJIN POLYTECHNIC UNIV
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