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Prepn precess of composite asymmetrical affinity polysulfone-hydroxyethyl cellulose ultrafiltering film

A technology of hydroxyethyl cellulose and ultrafiltration membranes, which is applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of complex activation methods and the internal structure of membrane formation, etc., and achieve ideal pore structure , good mechanical strength, good hydrophilic effect

Inactive Publication Date: 2003-05-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods all introduce a certain number of active groups and improve the hydrophilic properties of the membrane to a certain extent, but the activation method is relatively complicated and does not consider the internal structure of the membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] 1. Preparation of Chloromethylated Polysulfone Asymmetric Membrane

[0009] Put chloromethylated polysulfone and polyethylene glycol in dimethylformamide, the ratio of chloromethylated polysulfone / polyethylene glycol is 4 / 1, the molecular weight of polyethylene glycol is 600, 80-85℃ Stirring was continued for 12 hours. Then put the casting solution in a dark place and let it stand for 24 hours. Pour the film-casting liquid onto a glass plate, the temperature of the glass plate is 50°C, scrape with a scraper to form a film, evaporate for 30 seconds, immerse in distilled water, and solidify for 1 hour. The solidified membrane was taken out and washed with flowing water for 24 hours to obtain a chloromethylated polysulfone asymmetric membrane with through holes at the bottom.

[0010] 2. Preparation of Hydroxymethyl Polysulfone Membrane

[0011] Take the chloromethylated polysulfone membrane prepared in step 1, place it in 15% soda ash solution, and vibrate at a constan...

Embodiment 2

[0015] Take chloromethylated polysulfone and ethylene glycol monomethyl ether and put them in N-methylpyrrolidone, the ratio of chloromethylated polysulfone / ethylene glycol monomethyl ether is 4 / 1, and stir at 80-85°C for 15 hours. Then put the casting solution in a dark place and let it stand for 24 hours. Pour the film-casting solution on a glass plate, the temperature of the glass plate is 70°C, use a scraper to form a film, evaporate for 1 minute, immerse in 10% propionic acid solution, and solidify for 1 hour. The coagulated film was taken out and washed with running water for 24 hours. The asymmetric membrane of chloromethylated polysulfone is obtained.

[0016] A hydroxymethyl polysulfone membrane was prepared according to the scheme of Example 1.

[0017] Take a piece of hydroxymethylpolysulfone membrane with a diameter of 47mm, place it in 1% carbonyldiimidazole in acetone solution, shake it for 1 hour at room temperature, then wash it with acetone for 3 times, and ...

Embodiment 3

[0019] Dissolve 80 mg of sodium borohydride in 12 ml of 2M NaOH, add 20 ml of water and 4 ml of diepoxyalkylene. The hydroxymethylpolysulfone membrane prepared in Example 1 was placed in the above solution, activated by shaking at room temperature for 4 hours, and then washed 3 times with distilled water. The activated membrane was placed in 2% hydroxyethyl cellulose alkaline aqueous solution, pH 11, shaken at 40°C for 5 hours, and then dried in an oven at 120°C for 4 hours. Wash the dried membrane with 0.1M sodium hydroxide solution for 1 hour, and wash it with a large amount of distilled water for 1 day to obtain a polysulfone-hydroxyethyl cellulose composite membrane. The amount of hydroxyethyl cellulose coupled with the membrane reaches: 95mg / g polysulfone membrane.

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Abstract

Asymmetrical polysulfone ultrafiltering membrane is first prepared via phase transferring process using chloromethylated polysulfone as base material and is then hydrolyzed to activate and reacted directly or indirectly with hydroxyethyl cellulose solution to form the composite polysulfone-hydroxyethyl cellulose membrane. The preparation process is characterized by the hydrolysis in alkali water solution at 50-90 deg.c to produce hydroxymethyl polysulfone membrane. The prepared composite asymmetrical polysulfone-hydroxyethyl cellulose membrane has coupled hydroxyethyl cellulose amount up to 90-160 mg to each gram polysulfone membrane. The composite membrane has excellent hydrophilicity, low non-specific adsorption, high mechanical strength and ideal pore structure and may be used widely in affinity ultrafiltration.

Description

technical field [0001] The invention relates to a preparation method of an affinity polysulfone-hydroxyethyl cellulose composite asymmetric ultrafiltration membrane, which belongs to the preparation technology of the composite ultrafiltration membrane. Background technique [0002] Polysulfone has been widely used in ultrafiltration technology due to its superior film-forming properties and good chemical stability, but its inherent hydrophobicity and no functional groups on the molecule can be directly used to immobilize biomacromolecules, so that It cannot be directly used as a medium for affinity separation and must be chemically modified. At present, there are five kinds of chemical modification methods: (1) Preparation of copolymers of polysulfone derivatives that can form membranes and have active groups and hydrophilic properties [Klein E, Silva L. Hydrophilic semipermeable membranes based on copolymers of acrylonitrile and hydroxyalkyl este...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/10B01D71/68
Inventor 石巍张凤宝张国亮
Owner TIANJIN UNIV
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