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Ultrafiltration membrane and preparing method thereof

An ultrafiltration membrane and base membrane technology, applied in the field of membrane separation, can solve the problems of low anti-pollution ability, poor hydrophilicity of polyethersulfone ultrafiltration membrane, short service life, etc., and achieve strong anti-pollution ability and excellent hydrophilic performance. , the effect of long service life

Active Publication Date: 2015-04-22
安得膜分离技术工程(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, polysulfone ultrafiltration membrane and polyethersulfone ultrafiltration membrane have poor hydrophilicity, low anti-pollution ability and short service life.

Method used

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Examples

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preparation example Construction

[0031] The invention also discloses a method for preparing an ultrafiltration membrane, comprising the following steps:

[0032] (A) providing a base membrane, the base membrane is a polysulfone membrane or a polyethersulfone membrane;

[0033] (B) coating a solution containing sulfomethylated polysulfone on the base membrane to obtain an ultrafiltration membrane;

[0034] The solution containing sulfomethylated polysulfone includes sulfomethylated polysulfone, pre-dissolved solution, dissolved diluent and water;

[0035] The mass fraction of the sulfomethylated polysulfone is 0.5-5%;

[0036] The mass fraction of the pre-dissolved solution is 3% to 8%;

[0037] The mass fraction of the dissolving diluent is 25-50%.

[0038] According to the present invention, a base membrane is firstly provided, and the base membrane is a polysulfone membrane or a polyethersulfone membrane. The invention has no special limitation on the source of the base film, which can be a commercially...

Embodiment 1

[0048]Dissolve 230g of polyethersulfone (23%), 10g of polyvinylpyrrolidone (1%), and 5g of polyethylene glycol (0.5%) in 755g of N-methylpyrrolidone, and stir fully at 80°C until each component is uniformly dissolved. Seal and stand for defoaming to obtain casting solution.

[0049] Use a scraper to evenly spread the casting solution on the polyester non-woven fabric as the supporting material, and then put it into the coagulation bath to form a film quickly after standing for 10-25S. The coagulation bath is pure water, and the temperature of the coagulation bath is controlled at 2 °C, and the ambient humidity is controlled at 30%, to obtain a base film.

[0050] Immerse the base film in a coating solution with a mass fraction of sulfomethyl polysulfone of 1.5%, a mass fraction of N-methylpyrrolidone of 5%, a mass fraction of glycerol of 40%, and a mass fraction of water of 53.5%. After 15 seconds, take out the membrane and dry it at 80°C to obtain an ultrafiltration membrane...

Embodiment 2

[0061] Dissolve 230g of polyethersulfone, 20g of polyvinyl alcohol, and 30g of povidone in 720g of dimethylformamide, fully stir at 80°C until each component is uniformly dissolved, seal and stand for defoaming to obtain a casting solution.

[0062] Use a scraper to evenly spread the casting solution on the polyester non-woven fabric as the supporting material, and then put it into the coagulation bath to form a film quickly after standing for 10-25S. The coagulation bath is pure water, and the temperature of the coagulation bath is controlled at 2 °C, and the ambient humidity is controlled at 30%, to obtain a base film.

[0063] Immerse the base film in the coating solution with a mass fraction of sulfomethyl polysulfone of 1.5%, a mass fraction of N-methylpyrrolidone of 5%, a mass fraction of ether of 45%, and a mass fraction of water of 48.5%, and stay for 20 seconds , take out the membrane and dry it at 80°C to obtain an ultrafiltration membrane with a cut molecular weight...

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Abstract

The invention provides an ultrafiltration membrane which comprises a base membrane body and a sulfomethylation polysulfone coating compounded on the base membrane body, wherein the base membrane body is a polysulfone membrane or a polyether sulfone membrane. A preparing method of the ultrafiltration membrane includes the steps that the base membrane body is provided, wherein the base membrane body is the polysulfone membrane or the polyether sulfone membrane; the base membrane body is coated with a solution containing sulfomethylation polysulfone to obtain the ultrafiltration membrane, wherein the solution containing the sulfomethylation polysulfone comprises the sulfomethylation polysulfone, predissolved liquid, dissolved diluent and water, the mass percent of the sulfomethylation polysulfone is 0.5-5%, the mass percent of the predissolved liquid is 3-8%, and the mass percent of the dissolved diluent is 25-50%. The ultrafiltration membrane is good in hydrophilicity, high in anti-pollution capacity and long in service life.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to an ultrafiltration membrane and a preparation method thereof. Background technique [0002] Membrane and membrane separation technology is a new type of high-efficiency separation technology, especially in line with the needs of modern industry for energy saving, improvement of production efficiency, reuse of low-grade raw materials and elimination of environmental pollution. Compared with traditional separation methods (such as evaporation, extraction or ion exchange, etc.), membrane separation technology operates at room temperature without phase change, and is especially suitable for the separation and concentration of heat-sensitive substances and biologically active substances, with high efficiency and energy saving , simple process, less investment, less pollution, etc., so membrane separation technology has broad application prospects in chemical industry, elec...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/68B01D67/00B01D61/14
Inventor 岳英李政雄朱翠芝杜德志
Owner 安得膜分离技术工程(北京)有限公司
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