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Preparation method of dry type polyacrylointrile ultrafiltration membrane

A technology of polyacrylonitrile and ultrafiltration membrane, applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc.

Inactive Publication Date: 2003-10-15
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention overcomes the shortcoming that the dry ultrafiltration membrane cannot be used in the preparation of composite membrane due to the impregnation of glycerin in the past, and provides a kind of water flux and interception performance basically maintained at the level of the wet membrane produced, which is not used during use. The preparation method of the dry polyacrylonitrile ultrafiltration membrane that will change again, this method is also applicable to the production of other dry organic polymer ultrafiltration membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 Dissolve 14.0 grams of polyacrylonitrile (Mw 400,000) in 76.5 grams of dimethylacetamide, stir and dissolve, then add 9.5 grams of polyethylene glycol (PEG), and stir evenly to become a ternary film casting solution . Scrape the casting solution on the polyester non-woven fabric, volatilize the solvent in the air for 5 seconds, immerse the non-woven fabric with the polyacrylonitrile film layer in hot water at 60°C, take it out after 10 minutes, and put It is dried in the air at room temperature to obtain a dry polyacrylonitrile ultrafiltration membrane. The rejection rate of the membrane to 1% γ-globulin solution is 95.0%, the rejection rate to 1% bovine serum albumin solution is 92.3%, and the pure water flux is 45.4ml.cm -2 .h -1 .

Embodiment 2

[0021] Example 2 Change the polyacrylonitrile (Mw 100,000) to 18.0 grams, the solvent dimethylacetamide to 72.5 grams, and the time to evaporate the solvent in the air to 30 seconds. The temperature of the hot water in the gel bath is 45° C., and other processes and operating conditions are the same as in Example 1. The obtained dry polyacrylonitrile ultrafiltration membrane has a rejection rate of 90.5% to 1% bovine serum albumin solution, and a pure water flux of 37.6ml.cm -2 .h -1 .

Embodiment 3

[0022] Example 3 16.0 grams of polyacrylonitrile (Mw 100,000), 76.0 grams of dimethylacetamide, and 8.0 grams of ethylene glycol monomethyl ether were made into a ternary casting solution, scraped the film on the non-woven fabric, and volatilized in the air for 30 seconds , soak the non-woven fabric with polyacrylonitrile film layer in hot water at 50°C for 20 minutes, take it out, and dry it in the air at room temperature. The rejection rate is 93.3%, and the pure water flux is 26.2ml.cm -2 .h -1 .

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Abstract

The preparation method of polyacrylonitrile ultrafiltration membrane includes the following steps: 1. dissolving 100 portions of polyacrylonitrile resin whose weight-average molecular weight is 100000-400000 in 660-360 portions of organic solvent; 2. adding 80-40 portions of additive with action of forming pores into the above-mentioned binary solution to form three-component membrane-casting liuqor; and 3. spread-coating the above-mentioned three-component membrane-casting liquor on the porous substrate, after the solvent is volatilized, soaking the above-mentioned material in hot water of coagulation bath and drying by airing so as to obtain the invented ultrafiltration membrane which can meet the requirements of support base membrane for penetration vaporization membrane, gas separation membrane and reverse osmose composite membrane.

Description

technical field [0001] The invention relates to a preparation method of a dry polyacrylonitrile ultrafiltration membrane. Background technique [0002] Membrane separation technology has achieved rapid development in recent years. Because most of its processes have no phase change, low energy consumption, easy operation and no pollution, it has developed into a major industrial technology and has penetrated into various fields of the national economy and human life. [0003] Ultrafiltration membrane is a kind of selective separation membrane, usually with a pore size of 0.01-0.03 μm. When there is a certain pressure difference on both sides of the membrane, it can filter and intercept soluble macromolecules, solid particles, bacteria, colloids, etc. in the solution, and realize the separation of liquid and soluble macromolecules or solid particles. It is widely used in Improve drinking water quality, pretreatment of pure water production, wastewater treatment and recovery ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/42
Inventor 蒋晓钧施艳荞陈观文
Owner INST OF CHEM CHINESE ACAD OF SCI