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Membrane casting solution, ultrafiltration membrane and preparation method of ultrafiltration membrane

A technology of casting membrane liquid and ultrafiltration membrane, which is applied in the direction of ultrafiltration, chemical instruments and methods, membrane technology, etc., can solve problems that need to be improved, achieve high water flux and rejection rate, good heat resistance, excellent water resistance The effect of pressure performance

Active Publication Date: 2018-12-18
CHINA LUCKY FILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The practical performance of ultrafiltration membranes widely used in ultrafiltration separation technology, such as pressure resistance, high temperature resistance and acid and alkali resistance, still needs to be improved

Method used

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  • Membrane casting solution, ultrafiltration membrane and preparation method of ultrafiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Weigh dry polym-phenylene isophthalamide (relative molecular mass is 250,000) raw material 15 grams, 4 gram polyethylene glycols (relative molecular mass is 400), join the 81 grams of dimethylacetamide In the solvent, stir and soak at room temperature for 1 hour, then heat up to 80°C and heat and dissolve for 6 hours. The prepared casting solution includes 15 parts by weight of polyamide, 4 parts by weight of additives and the rest of the solvent. After filtering, let it stand defoaming.

[0068] Paste the non-woven fabric flat on a clean glass plate. The humidity in the casting chamber is controlled at 40%, the temperature in the casting chamber is controlled at 25°C, and the completely degassed casting solution is poured into the clean casting chamber. On the woven cloth, use a stainless steel scraper with a thickness of 0.25mm to form a film, evaporate the nascent film in an air bath for 10 seconds, quickly put it into a coagulation bath with a temperature of 25°C, a...

Embodiment 2

[0070] Weigh dry polym-phenylene isophthalamide (relative molecular mass is 250,000) raw material 15 grams, 10 gram polyethylene glycols (relative molecular mass is 400), join in 75 grams of dimethylacetamide In the solvent, stir and soak at room temperature for 1 hour, then heat up to 80°C and heat to dissolve for 6 hours. The prepared casting solution includes 15 parts by weight of polyamide, 10 parts by weight of additives and the rest of the solvent. After filtering, let it stand defoaming.

[0071] The preparation conditions of the ultrafiltration membrane are the same as in Example 1.

Embodiment 3

[0073] Weigh 15 grams of dry polym-phenylene isophthalamide (relative molecular mass is 250,000) raw material, 4 grams of polyvinylpyrrolidone, join in the solvent of dimethylacetamide 81 grams, stir at room temperature Soak for 1 hour, then raise the temperature to 80° C. and heat to dissolve for 6 hours. The prepared casting solution includes 15 parts by weight of polyamide, 4 parts by weight of additives and the rest of the solvent. After filtering, let it stand for defoaming.

[0074] The preparation conditions of the ultrafiltration membrane are the same as in Example 1.

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Abstract

The invention provides a membrane casting solution, an ultrafiltration membrane and a preparation method of the ultrafiltration membrane. The membrane casting solution includes: polyamide; a pore-forming additive; and a solvent, the relative molecular mass of the polyamide is 200000-300000. As a result, the viscosity of the membrane casting solution is more appropriate, and the membrane casting solution has almost no bubbles, and is conducive to film formation.

Description

technical field [0001] The invention relates to the technical field of membrane production, in particular to a membrane casting solution, an ultrafiltration membrane and a method for preparing the ultrafiltration membrane. Background technique [0002] Membrane separation technology is mainly divided into four separation technologies: reverse osmosis (RO), nanofiltration (NF), ultrafiltration (UF), and microfiltration (MF). It is widely used in water treatment, medical industry and food industry due to its advantages of large size and easier operation. It is developing rapidly and has broad prospects. The practical performance of ultrafiltration membranes widely used in ultrafiltration separation technology, such as pressure resistance, high temperature resistance, and acid and alkali resistance, still needs to be improved. Contents of the invention [0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D67/00B01D61/14C02F1/44
CPCB01D61/145B01D67/0002B01D71/56C02F1/444
Inventor 孟祥钦柳艳敏江晓利郭宇丁宇陈月霞赵伟建
Owner CHINA LUCKY FILM CORP
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