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Ultrafiltration membrane and preparation method thereof

A technology of ultrafiltration membrane and membrane casting solution, which is applied in the field of ultrafiltration membrane, which can solve the problems of long production cycle, inability to fundamentally solve the alkali resistance of the membrane, and the complexity of the overall process.

Active Publication Date: 2014-02-05
中科瑞阳膜技术(北京)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned preparation process first coats the composite layer, and then hydrolyzes after phase inversion. The overall process is relatively complicated, the production cycle is long, the cost is high, and it is difficult to industrialize; Alkali resistance

Method used

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  • Ultrafiltration membrane and preparation method thereof
  • Ultrafiltration membrane and preparation method thereof
  • Ultrafiltration membrane and preparation method thereof

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Embodiment Construction

[0050] The casting solution of the present invention can be applied to the non-woven fabric by methods and devices in the prior art, the methods and devices disclosed in CN1176608A can be used, and the method of spraying can also be used. In a specific embodiment of the present invention, the coating method and device used are the same as those disclosed in CN1176608A.

[0051] Cross-linked cellulose ultrafiltration membrane of the present invention mainly solves the alkali resistance of cellulose ester, and its preparation process comprises two parts:

[0052] 1. First, the preparation and hydrolysis process of cellulose ester (the hydrolysis process is equivalent to the deacetylation process). Cellulose ester (such as cellulose acetate, cellulose triacetate, cellulose nitrate, cellulose acetate butyrate and cellulose acetate propionate, etc.) 10-25wt%, solvent (such as acetone, formamide, dioxane, N-methylpyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, etc.) 65-9...

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Abstract

The invention relates to a cross-linking cellulose ultrafiltration membrane and a preparation method thereof. The cross-linking cellulose ultrafiltration membrane comprises a non-woven fabric layer and a cross-linking cellulose layer, wherein the non-woven fabric is selected from a polyester non-woven fabric, a polypropylene non-woven fabric, a polyethylene non-woven fabric and a polypropylene and polyethylene polymer non-woven fabric; the cross-linking cellulose is a product obtained by crosslinking and polymerizing glutaric dialdehyde, cellulose and polyvinyl alcohol. According to the invention, the hydroxy hydrolyzed from cellulose ester and the polyvinyl alcohol are crosslinked by adopting a cross-linking technology and utilizing the characteristics of the cellulose and the polyvinyl alcohol. The process disclosed by the invention is simple in production process, and shortens the production time and reduces the production cost by integrating a cross-linking process and a membrane drying process, thereby realizing the enhancement of alkali resistance property.

Description

technical field [0001] The invention belongs to the field of membrane technology, and relates to an ultrafiltration membrane, in particular to a cross-linked cellulose ultrafiltration membrane and a preparation method thereof. Background technique [0002] Membrane technology has been widely used in the fields of food, chemistry, medicine and environmental protection. Ultrafiltration technology is an important part of membrane technology and has a wide range of applications in technical fields such as protein concentration, sewage treatment and natural product separation. [0003] The core component of ultrafiltration technology is the ultrafiltration membrane. In the application process of ultrafiltration membrane, due to the difference in the properties of the feed liquid, the membrane performance shows a large difference under the same operating conditions. In the food field, it is often necessary to concentrate or separate proteins. The feed liquid to be separated cont...

Claims

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Application Information

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IPC IPC(8): B01D71/10B01D69/12B01D67/00
Inventor 李宁何福海魏齐杨楠
Owner 中科瑞阳膜技术(北京)有限公司
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