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A kind of lignin cross-linked modified polymer separation membrane and use thereof

A cross-linking modification and lignin technology, which is applied in the field of lignin cross-linking modification polymer separation membrane, can solve the problems of difficult hydrophilicity and pollution resistance, single type of hydrophilic modifier, high synthesis cost, etc. , to achieve the effect of reducing preparation cost, low cost and simple operation

Active Publication Date: 2017-03-29
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two disadvantages in the existing polymer separation membrane blending modification method: (1) the type of hydrophilic modifier is single, or the synthesis cost is high (such as amphiphilic block polymer); (2) )Most hydrophilic polymers have good water solubility. On the one hand, they precipitate into the coagulation bath during the film forming process and become porogens; on the other hand, they gradually dissolve and lose during the long-term operation of the film. Hydrophilicity and stain resistance

Method used

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  • A kind of lignin cross-linked modified polymer separation membrane and use thereof
  • A kind of lignin cross-linked modified polymer separation membrane and use thereof
  • A kind of lignin cross-linked modified polymer separation membrane and use thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Mix polysulfone, lignosulfonate, water, and N,N-dimethylacetamide with a mass ratio of 15:0.4:1:85, stir and dissolve at 60°C for 4 hours to form a uniform solution, and then Stir at ℃ for 30 minutes, add glutaraldehyde with a mass percentage that is 4 times the lignin mass percentage in the solution, leave it to defoam for 12 hours to obtain a casting solution, and process it through a film forming machine to form a nascent film. In the last 10 minutes, immerse in an aqueous solution with a mass percentage of 15% N,N-dimethylacetamide at 50°C for 5 hours to promote crosslinking, and then transfer to a water bath at 60°C for 2 hours to stabilize crosslinking and obtain hydrophilic permanent polysulfone membrane.

[0021] figure 1 with 2 They are the scanning electron micrographs of the upper surface and cross-sectional structure of Example 1, respectively.

Embodiment 2

[0023] Mix polysulfone, alkali lignin, dioxane, and N,N-dimethylformamide with a mass ratio of 10:2:4:90, stir and dissolve at 40°C for 2 hours to form a uniform solution, and then Stirring at 20°C for 10 minutes, adding glutaraldehyde with a mass percentage content 6 times the lignin mass percentage content in the solution, standing for 12 hours for defoaming to obtain a casting solution, and forming a primary film through a film forming machine. Within 10 minutes after molding, immerse in an aqueous solution of 10% N,N-dimethylformamide at 60°C for 8 hours to promote crosslinking, then transfer to a water bath at 80°C for 12 hours to stabilize crosslinking, and obtain a hydrophilic Aqueous polysulfone membrane.

Embodiment 3

[0025] Mix polysulfone, lignosulfonate, water, and N,N-dimethylacetamide with a mass ratio of 30:0.2:1:70, stir and dissolve at 80°C for 12 hours to form a uniform solution, and then Stirring at ℃ for 1 hour, adding glutaraldehyde with a mass percentage of twice the lignin mass percentage in the solution, standing for 12 hours for defoaming to obtain a casting solution, processing and forming a primary film by a film forming machine, forming After 10 minutes, enter 15°C in an aqueous solution with a mass percentage of 60% N,N-dimethylacetamide and immerse for 10 minutes to promote crosslinking, and then transfer to a 40°C water bath for 8 hours to stabilize crosslinking and obtain hydrophilic permanent polysulfone membrane.

[0026] The measurement results are: the static water contact angle of the polysulfone membrane is 69°; the average pore size is 0.11 μm; the pure water flux of the membrane is 130L m at 25°C and 0.1MPa pressure -2 h -1 .

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Abstract

The invention discloses a lignin-crosslinking modified polymer separation membrane and an application thereof. Lignin is taken as a modifier and pre-dispersed in a membrane casting solution together with a crosslinking agent, lignin crosslinking is prompted through heating in a membrane forming process with a phase inversion method and an aftertreatment process, so that the crosslinked lignin exists stably in a substrate of the polymer separation membrane, and the long-acting hydrophilicity and lasting anti-fouling performance of the polymer separation membrane are realized. The lignin-crosslinking modified polymer separation membrane has low cost of raw materials, long service life and excellent anti-fouling performance; a preparation method has the advantages of simple process, easiness in operation, high universality and mild condition and is suitable for preparing a hydrophilic micro-filtration membrane, an ultrafiltration membrane, a nanofiltration membrane, a forward osmosis membrane, a reverse osmosis membrane, a pressure-retarded osmosis membrane and the like.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a lignin cross-linked modified polymer separation membrane and its application. Background technique [0002] Membrane separation technology is widely used in pure water purification, sewage treatment, food concentration, seawater desalination, gas separation and other fields due to its simple operation, high efficiency and environmental protection. However, polymer separation membranes are easily contaminated by proteins, carbohydrates, natural organic matter, polysaccharides and other substances during the application process, resulting in clogged membrane pores, decreased flux, and shortened service life. Therefore, it is of great significance to improve the hydrophilicity and antifouling properties of polymer separation membranes. [0003] The hydrophilic modification of polymer separation membrane mainly includes adsorption method, coating method, su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D71/74B01D71/06B01D71/56B01D69/12B01D69/02B01D61/18B01D61/08
Inventor 吴青芸顾林
Owner NINGBO UNIV
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