Hydrophilic porous diffusion barrier and its prepn. method

A porous separation membrane and modification technology, which is applied in the field of directly preparing hydrophilic porous separation membranes by a phase inversion method, can solve the problems of difficulty in regulating the filling amount of nano-silica and lack of broad-spectrum solvent resistance.

Inactive Publication Date: 2006-11-29
TIANJIN MOTIAN MEMBRANE ENG & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the filling amount of nano-silica is difficult to control, and there is no report on broad-spectrum solvent resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The degree of acetalization is 9 grams of acetaldehyde-modified polyvinyl alcohol (the degree of polymerization of polyvinyl alcohol is 1799) of 49%, 10 grams of polyethylene glycol 600 (relative molecular mass is 600) and 81 grams of dimethylacetamide Mix, heat and stir to dissolve, then let stand at a constant temperature of 70°C for 24 hours for degassing, the casting solution is scraped to form a film, and then undergoes phase inversion and solidification in an alkaline solution containing sodium sulfate to form a film; after half an hour, the film is immersed in glutaraldehyde concentration Post-treatment was performed for 2 hours in a 10% acidic treatment solution. The obtained membrane has an asymmetric structure, and the pure water flux of the membrane is 56.6-424.5L / m 2 h (0.1MPa), the rejection rate of bovine serum albumin is 85-95.5%, and the surface contact angle of the membrane is 25°.

Embodiment 2

[0024] 12 grams of acetaldehyde-modified polyvinyl alcohol (the degree of polymerization of polyvinyl alcohol is 1799) with acetalization degree of 57%, 10 grams of polyethylene glycol 600 (relative molecular mass is 600) and 78 grams of dimethylacetamide Mix, heat and stir to dissolve, then let stand at 70°C for defoaming for 24hrs, scrape the cast film solution with a temperature of 45°C to form a film, and then phase inversion and solidify into a film in an alkaline solution containing sodium sulfate; carry out according to the post-treatment method of Example 1 post-crosslinking treatment. The pure water flux of the membrane is 106-778.3L / m 2 h (0.1MPa), the rejection rate of bovine serum albumin is 95.8%, and the surface contact angle of the membrane is 40°.

Embodiment 3

[0026] Mix 10 grams of polyvinyl butyral, 10 grams of polyethylene glycol 400 (relative molecular mass: 400) and 80 grams of dimethylacetamide, heat and stir to dissolve, then let it stand at a constant temperature of 70°C for 24 hours for defoaming, and the casting solution After being scraped to form a film, it is solidified in water to form a film, and the cross-linking post-treatment is carried out according to the post-treatment method of Example 1. The pure water flux of the membrane is 870-1707L / m 2 h (0.1MPa), the rejection rate of bovine serum albumin is 70%, the porosity of the membrane is 80-83%, and the surface contact angle of the membrane is 56°.

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Abstract

A hydrophilic porous separating membrane is prepared by phase conversion method. Its membrane forming liquid contains modified polyvinyl alcohol, which is modified by acetalizing, esterifying or etherifying, solvent and pore-forming agent.

Description

technical field [0001] The invention relates to a hydrophilic porous separation membrane and a preparation method thereof, in particular to a preparation method for directly preparing a hydrophilic porous separation membrane by adopting a phase inversion method. Background technique [0002] Membrane filtration technology is a relatively fast-growing membrane process, and ultrafiltration membranes and microfiltration membranes are the most widely used separation membranes. The development and wide application of membrane filtration technology put forward higher requirements on the performance of separation membranes. The research and development of separation membranes with special properties such as anti-pollution, temperature resistance and solvent resistance has become a key topic of current research. Among them, the fouling problem of the separation membrane during use is still the bottleneck restricting the development and wide application of membrane filtration technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/38
Inventor 张玉忠李慧琴李泓
Owner TIANJIN MOTIAN MEMBRANE ENG & TECH
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