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Preparation method of polysulfone ultrafiltration membrane

A technology of polysulfone ultrafiltration membrane and surfactant, which is applied in the direction of chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems such as surface pollution of polysulfone membrane, achieve good hydrophilicity of the membrane surface, and prepare Simple method and easy-to-obtain raw materials

Inactive Publication Date: 2013-02-13
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polysulfone (PSF for short) is a membrane material with good chemical stability, strong compression resistance and high mechanical strength. It not only has excellent permeability, but also has excellent heat resistance, solvent resistance and high mechanical strength. Therefore, polysulfone is an ultrafiltration, microfiltration, and reverse osmosis membrane material widely used in industry at present, but the hydrophobic characteristics of polysulfone often lead to a large number of protein molecules being adsorbed on the surface of the membrane, resulting in serious pollution of the surface of the polysulfone membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Dissolve 0.1% of sulfate ester anionic surfactant in N-N dimethylacetamide solvent at 70°C. After it is completely dissolved, add polysulfone with a mass fraction of 18%. After they are completely dissolved, After the prepared casting solution is formed into a membrane by the machine scraping method, the obtained polysulfone membrane is soaked in pure water for 30 minutes, so that the performance stability of the polysulfone membrane is increased, and the hydrophilic modifier is dissolved in water. Thereby increasing the porosity of the ultrafiltration membrane, the prepared polysulfone ultrafiltration membrane has a rejection rate of 89.5% for ovalbumin, and the membrane water flux can reach 72.5L / m 2 .h.

Embodiment 2

[0013] Dissolve 0.5% of quaternary ammonium salt cationic surfactant in N-N dimethylacetamide solvent at 70°C. After it is completely dissolved, add polysulfone with a mass fraction of 18%. After they are completely dissolved, prepare After a good casting solution is made into a membrane by the machine scraping method, the obtained polysulfone membrane is soaked in pure water for 20 minutes, so that the performance stability of the polysulfone membrane is increased, and the hydrophilic modifier is dissolved in water, thereby Increase the porosity of the ultrafiltration membrane, the prepared polysulfone ultrafiltration membrane has a rejection rate of 98.9% for ovalbumin, and the membrane water flux can reach 73L / m 2 .h.

Embodiment 3

[0015] Dissolve 1% polyoxyethylene amine surfactant in N-N dimethylacetamide solvent at 70°C. After it is completely dissolved, add polysulfone with a mass fraction of 18%. After they are completely dissolved, prepare After a good casting solution is made into a membrane by the machine scraping method, the obtained polysulfone membrane is soaked in pure water for a period of time, so that the performance stability of the polysulfone membrane is increased, and the hydrophilic modifier is dissolved in water, thereby increasing The porosity of the ultrafiltration membrane, the prepared polysulfone ultrafiltration membrane has a rejection rate of 94% for ovalbumin, and the membrane water flux can reach 61.5L / m 2 .h.

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Abstract

The invention discloses a preparation method of polymeric membrane, in particular to a preparation method of polysulfone ultrafiltration membrane. The preparation method comprises the following steps: a certain concentration of surfactant is dissolved in N-N dimethylacetamide solution at the temperature of 70 DEG C, after the surfactant is completely dissolved, polysulfone with the mass fraction of 18% is added, after the two are completely dissolved, prepared casting membrane solution is used to prepare membrane by a machine membrane scraping method, and the obtained polysulfone membrane is dipped in pure water for a period of time, so that the performance stability of the polysulfone membrane is improved, a hydrophilic modifier is dissolved in water, and the void ratio of the ultrafiltration membrane is improved. The preparation method has the advantages that the selection separation performance is not lower than that of existing ultrafiltration membrane, the materials are easily obtained, the preparation method is simple, and the membrane surface has good hydrophily and good antifouling property.

Description

technical field [0001] The invention relates to a preparation method of a polymer membrane, in particular to a preparation method of a polysulfone ultrafiltration membrane. Background technique [0002] The ultrafiltration membrane is a solution under pressure, the solvent and some low-molecular-weight solutes pass through the micropores on the membrane to reach the other side of the membrane, while the high-molecular solutes or other emulsified micelles are trapped to achieve the purpose of separation from the solution. The polysulfone ultrafiltration process has been widely used because of its characteristics of large separation coefficient, operating temperature around room temperature, no phase change, simple operation and relatively simple equipment. Therefore, ultrafiltration technology is widely used in the fields of sewage treatment, water treatment and biotechnology. [0003] Polysulfone (PSF for short) is a membrane material with good chemical stability, strong co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/02B01D67/00
Inventor 周勇翟丁高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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