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Preparation method of multi-layer composite-structure filter membrane

A multi-layer composite and composite membrane technology, applied in chemical instruments and methods, ultrafiltration, membrane technology, etc., can solve the problems of maximum water flux limitation and low porosity, and achieve high water flux, high porosity, The effect of increased water flux

Inactive Publication Date: 2013-03-06
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this composite membrane is that the support layer under the ultra-thin separation layer is relatively dense and has low porosity, which will have a certain impact on the water flux of the membrane and limit the maximum water flux.

Method used

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  • Preparation method of multi-layer composite-structure filter membrane
  • Preparation method of multi-layer composite-structure filter membrane
  • Preparation method of multi-layer composite-structure filter membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1). Dissolve polyvinylidene fluoride in N,N-dimethylformamide at 50°C, stir for 6 hours to mix evenly, and obtain polyvinylidene fluoride electrospinning solution, wherein polyvinylidene fluoride is in The volume concentration in the electrospinning solution was 15%.

[0054] 2). Put the polyvinylidene fluoride electrospinning solution prepared in step 1) into the liquid storage device of the electrospinning equipment at a temperature of 50°C. The piston of the liquid storage device is connected to the syringe pump, and the liquid storage device passes through the The tetrafluoroethylene tube is connected to the spinneret, the spinneret is fixed, and the non-woven fabric is placed on the metal plate as a collector. Adjust the distance between the spinneret and the collector to be 15cm; the ambient temperature of spinning is 50°C, including the temperature of the electrospinning solution in the liquid storage device and the temperature of the collector are both 50°C; tur...

Embodiment 2

[0063] 1). Dissolve polyvinylidene fluoride in N,N-dimethylformamide at 50°C, stir for 6 hours to mix evenly, and obtain polyvinylidene fluoride electrospinning solution, wherein polyvinylidene fluoride is in The volume concentration in the electrospinning solution was 15%.

[0064]2). Put the polyvinylidene fluoride electrospinning solution prepared in step 1) into the liquid storage device of the electrospinning equipment at a temperature of 50°C. The piston of the liquid storage device is connected to the syringe pump, and the liquid storage device passes through the The tetrafluoroethylene tube is connected to the spinneret, the spinneret is fixed, and the non-woven fabric is placed on the metal plate as a collector. Adjust the distance between the spinneret and the collector to be 15cm; the ambient temperature of spinning is 50°C, including the temperature of the electrospinning solution in the liquid storage device and the temperature of the collector are both 50°C; turn...

Embodiment 3

[0072] 1). Dissolve polyvinylidene fluoride in N,N-dimethylformamide at 50°C, stir for 6 hours to mix evenly, and obtain polyvinylidene fluoride electrospinning solution, wherein polyvinylidene fluoride is in The volume concentration in the electrospinning solution was 15%.

[0073] 2). Put the polyvinylidene fluoride electrospinning solution prepared in step 1) into the liquid storage device of the electrospinning equipment at a temperature of 50°C. The piston of the liquid storage device is connected to the syringe pump, and the liquid storage device passes through the The tetrafluoroethylene tube is connected to the spinneret, the spinneret is fixed, and the non-woven fabric is placed on the metal plate as a collector. Adjust the distance between the spinneret and the collector to be 15cm; the ambient temperature of spinning is 50°C, including the temperature of the electrospinning solution in the liquid storage device and the temperature of the collector are both 50°C; tur...

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Abstract

The invention relates to a method for preparing a multi-layer composite-structure filter membrane with a plasma pretreatment method. According to the filter membrane, a polymer nano-grade fiber film layer prepared through an electrostatic spinning method, and a hydrophilic polymer ultra-thin separation layer are sequentially arranged on a non-woven fabric support layer substrate. Before the hydrophilic polymer ultra-thin separation layer is prepared through an interfacial polymerization reaction, the plasma pretreatment is carried out on the surface of the polymer nano-grade fiber film layer, such that functional groups are grafted on the surface of the polymer nano-grade fiber. Therefore, polymer nano-grade fiber film surface property is improved, such that the polymer ultra-thin separation layer can be better compounded, and the filtering performance of the multi-layer composite-structure filter membrane is comprehensively improved. The multi-layer composite-structure filter membrane provided by the invention has the characteristics of high water flux, high retention rate, and stable chemical property. The film can be used in productions of water used in special conditions, such as domestic water and drinking water. The film is suitable to be used in fields such as medicines, foodstuffs, environment protection, and the like.

Description

technical field [0001] The present invention relates to the ultrafiltration membrane or the nanofiltration membrane of multi-layer composite structure prepared by plasma pretreatment method, in particular to the ultrafiltration membrane or nanofiltration membrane which is composed of non-woven fabric support layer substrate, electrospun nanofiber membrane layer and interface by plasma pretreatment method. The invention relates to a preparation method of a filter membrane with a multi-layer composite structure composed of polymerized ultra-thin separation layers. Background technique [0002] With the rapid development of industry, water resources are seriously polluted, global fresh water resources are becoming increasingly scarce, and people's domestic water consumption is decreasing. It is becoming more and more important for water purification and reuse. Among the seven major water systems in China, 63.1% of the water quality of the river reaches Grade IV, Grade V or wors...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/12B01D61/02B01D61/14C02F1/44
Inventor 郑建芬张海源韩志超
Owner INST OF CHEM CHINESE ACAD OF SCI
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