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A method for constructing micro-nano structure on the surface of pes ultrafiltration membrane

A micro-nano structure, ultrafiltration membrane technology, applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve the problem of decreased use time extension effect, high cost of modified polyethersulfone membrane, and hydrophilic modification. The effect is not obvious, etc.

Inactive Publication Date: 2015-12-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems that the current method of modifying polyethersulfone membrane has high cost, the effect of hydrophilic modification is not obvious, and the effect decreases with the prolongation of use time, the present invention provides a micro-nano structure construction on the surface of PES ultrafiltration membrane method

Method used

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  • A method for constructing micro-nano structure on the surface of pes ultrafiltration membrane

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specific Embodiment approach 1

[0017] Embodiment 1: This embodiment provides a method for constructing a micro-nano structure on the surface of a PES ultrafiltration membrane, which is specifically completed according to the following steps:

[0018] 1. Preparation of PAN-g-SiO 2 Amphiphilic modifier:

[0019] 1. Add PAN to 1.0-3.0ml / L sodium hydroxide solution, wherein the mass of PAN:NaOH is 1:0.8-1.5.

[0020] 2. Add ethyl orthosilicate dropwise into the mixed solution in step 1, the mass of PAN and ethyl orthosilicate is 1:0.2-0.4.

[0021] 3. The mixed solution in step 2 is stirring and N 2 Under protection, the hydrolysis reaction is carried out at 50-85°C for 3-6 hours, so that the hydrolysis reaction of ethyl orthosilicate produces SiO 2 .

[0022] 4. Stop the reaction and cool to room temperature.

[0023] 5. Add aqueous HCl solution to the mixed solution in step 4 to neutralize the solution to acidity, and the pH of the solution is 1-5 at this time.

[0024] 6. Add an aqueous solution contai...

specific Embodiment approach 2

[0029] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the sodium hydroxide solution described in step one is 1.5~2.2mol / L, PAN: NaOH quality is 1: 0.9~1.3; PAN and orthosilicic acid The mass ratio of ethyl ester is 1:0.25~0.35; the reaction temperature is 60~70°C, the reaction time is 3.5~5h; the pH value is 3~5; the concentration of cerium ammonium nitrate aqueous solution is 1.2~1.4wt%, cerium ammonium nitrate The mass ratio to PAN is 0.07-0.10:1.

specific Embodiment approach 3

[0030] Specific embodiment three: the difference between this embodiment and specific embodiment one and two is: PES, PAN-g-SiO described in step two 2 The mass ratio of the amphiphilic modifier to the pore-forming agent PEG800 is 100:15-30:0.3-0.5.

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Abstract

The invention relates to a method for construction of a polyether sulfone (PES) ultrafilter membrane surface micro-nano structure. The method solves the problem that the product of the existing PES membrane modification method has a high cost, unconspicuous hydrophily modification effects and use effects reduced with use time increasing. The method comprises the following steps of 1, dissolving PES, a PAN-g-SiO2 amphiphilic modifier and a pore-forming agent PEG800 in DMF and carrying out stirring to obtain a homogeneous membrane-casting liquid, 2, stopping stirring, standing the membrane-casting liquid at a room temperature and carrying out deaeration, and 3, carrying out extrusion or blade coating shaping on the membrane-casting liquid, dipping the raw membrane into an ethanol aqueous solution for immersion, removing the residual organic solvent, putting the membrane into a glycerin solution, carrying out immersion, and carrying out air drying so that the PES ultrafilter membrane surface micro-nano structure for oil-water separation is constructed. The PES ultrafilter membrane surface micro-nano structure has oil-water separation effects.

Description

technical field [0001] The invention relates to a method for constructing a micro-nano structure on the surface of an ultrafiltration membrane material polyethersulfone membrane (PES). Background technique [0002] Polyethersulfone membrane material is a special material with excellent performance. Its glass transition temperature is 225°C and its long-term service temperature is 180-200°C. Its main chain contains rigid benzene ring structure, flexible ether bond and stable The sulfone bond makes it excellent in aging resistance and creep resistance, and has the characteristics of good thermal stability, chemical stability and mechanical stability. At the same time, polyethersulfone has good fluidity, is easy to process and shape, and can be prepared as a membrane material. It is one of the most widely used membrane materials at present. However, because the polyethersulfone membrane lacks hydrophilic groups and has no hydrogen bond with water, its water flux is low, and it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/02B01D67/00B01D17/022
Inventor 张春华刘雅薇廖庆光鄢嘉瑞
Owner HARBIN INST OF TECH
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