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A kind of preparation method of composite ultrafiltration membrane containing polyelectrolyte

An electrolyte and ultrafiltration membrane technology, applied in the field of separation membranes, can solve the problems of complex processes, failure to meet industrial processing requirements, low mechanical strength of porous membranes, etc., and achieve the effect of no agglomeration, large industrialization potential, and high retention.

Active Publication Date: 2021-12-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low mechanical strength of this type of porous membrane, it cannot meet the requirements of industrial processing.
There is also a patent (CN100411720C) reporting that a polyelectrolyte surface layer is formed on the base membrane by pressure-assisted suction filtration to obtain a polyelectrolyte composite membrane that can be used for pervaporation, but the process is relatively complicated

Method used

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  • A kind of preparation method of composite ultrafiltration membrane containing polyelectrolyte
  • A kind of preparation method of composite ultrafiltration membrane containing polyelectrolyte
  • A kind of preparation method of composite ultrafiltration membrane containing polyelectrolyte

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Effect test

Embodiment 1

[0016] The present embodiment provides a polyacrylic acid modified with dopamine (DA) as the polyanionic electrolyte (PAA-DA), Tf 2 N - Quaternized chitosan as counter ion as polycation electrolyte (QCS-Tf 2 N), the organic solvent is dimethyl sulfoxide (DMSO), and the polymer is polysulfone to prepare a composite ultrafiltration membrane, which is prepared according to the following steps:

[0017] 0.035g (1% relative to the mass of polysulfone) of PAA-DA (PAA molecular weight is 100K Da) and 0.035g (1% relative to the mass of polysulfone) QCS-Tf 2 N was added to 5mL of DMSO solution, stirred and sonicated for 10min to completely dissolve, then this solution was added to 3.5g of polysulfone and 15.5mL of DMSO polymer solution, stirred and sonicated to obtain a uniform casting solution . Scrape the membrane on a glass plate with 2mL of the casting solution, and immerse it in a gel water bath at 30°C for simultaneous phase inversion to obtain a polyelectrolyte-containing com...

Embodiment 2

[0019] The difference from Example 1 is that the mass fraction of the polysulfone solution is 12%.

Embodiment 3

[0021] The difference from Example 1 is that the mass fraction of the polysulfone solution is 16%.

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Abstract

The invention relates to a method for preparing a polyelectrolyte-containing composite ultrafiltration membrane. Scrape the membrane on a glass plate with liquid solution and immerse it in a gel water bath to prepare a polyelectrolyte-containing composite ultrafiltration membrane in one step. The advantages of the present invention are: on the one hand, the polyelectrolyte is uniformly dispersed in the polymer membrane matrix without agglomeration; on the other hand, the hydrophilicity and porous structure of the polyelectrolyte can fine-tune the hydrophilicity and pore structure of the ultrafiltration membrane , while ensuring a high interception, the water flux is greatly improved, and has great potential for industrialization.

Description

technical field [0001] The invention belongs to the field of separation membranes, in particular to a preparation method of a polyelectrolyte-containing composite ultrafiltration membrane. Background technique [0002] As a low-pressure membrane separation technology, ultrafiltration is widely used in the separation and purification of food, beverage and medicine. As an important part of the ultrafiltration process, ultrafiltration membranes are generally prepared from some common polymer solutions through phase inversion. Most ultrafiltration membranes have an asymmetric structure, which is generally considered to be composed of a dense skin layer and a porous support layer. At present, although the structure of the ultrafiltration membrane can be adjusted to improve the separation performance of the membrane by adjusting the solubility of the casting solution, the temperature and humidity of the phase inversion process. However, there are still deficiencies in this metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D69/12B01D69/02B01D67/00B01D61/14
CPCB01D71/82B01D69/12B01D69/02B01D67/0011B01D61/145B01D2325/36
Inventor 吴慧青丁金成武培怡
Owner DONGHUA UNIV
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