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Hyperfiltration membrane or nanofiltration membrane with multi-layered composite structure and preparation method thereof

A multi-layer composite and ultrafiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as low porosity, not widely used in industrial production, maximum water flux limitation, etc., to achieve The effect of high water flux, stable chemical performance and high retention rate

Inactive Publication Date: 2011-08-03
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 is that the support layer under the separation layer is relatively dense and has low porosity, which will have a certain impact on the water flux and limit the maximum water flux.
Although the use of plasma technology to prepare functional layers on the surface of membranes has been widely studied, this technology has not been widely used in industrial production, and its modification mechanism is still under further study

Method used

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  • Hyperfiltration membrane or nanofiltration membrane with multi-layered composite structure and preparation method thereof
  • Hyperfiltration membrane or nanofiltration membrane with multi-layered composite structure and preparation method thereof
  • Hyperfiltration membrane or nanofiltration membrane with multi-layered composite structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 1). Prepare the electrospinning solution. Dissolve the polymer (polyvinylidene fluoride) to be electrospun in N,N-dimethylformamide at 50°C, stir for 6 hours to make it evenly mixed, and obtain a polymer electrospinning solution, in which the polymer The volume concentration in the electrospinning solution was 15% (g / mL).

[0059] 2). Electrospinning. Put the electrospinning solution prepared in step 1) into the liquid storage device of the electrospinning equipment at a temperature of 50°C. The nozzles are connected, the spinneret is fixed, and a non-woven fabric is placed on a metal plate as a collector. Adjust the distance between the spinneret and the collecting plate to be 15cm; the ambient temperature for spinning is 50°C, including the temperature of the electrospinning solution in the liquid storage device and the temperature of the collecting plate are both 50°C, and the air flow rate in the environment is controlled at 0.5~0.8m 3 / h; turn on the high-volta...

Embodiment 2

[0067] 1). Prepare the electrospinning solution. Dissolve the polymer (polyvinylidene fluoride) to be electrospun in N,N-dimethylformamide at 50°C, stir for 6 hours to make it evenly mixed, and obtain a polymer electrospinning solution, in which the polymer The volume concentration in the electrospinning solution was 15% (g / mL).

[0068] 2). Electrospinning. Put the electrospinning solution prepared in step 1) into the liquid storage device of the electrospinning equipment at a temperature of 50°C. The nozzles are connected, the spinneret is fixed, and a non-woven fabric is placed on a metal plate as a collector. Adjust the distance between the spinneret and the collecting plate to be 15cm; the ambient temperature for spinning is 50°C, including the temperature of the electrospinning solution in the liquid storage device and the temperature of the collecting plate are both 50°C, and the air flow rate in the environment is controlled at 0.5~0.8m 3 / h; turn on the high-volta...

Embodiment 3

[0076] 1). Prepare the electrospinning solution. Dissolve the polymer (polyvinylidene fluoride) to be electrospun in N,N-dimethylformamide at 50°C, stir for 6 hours to make it evenly mixed, and obtain a polymer electrospinning solution, in which the polymer The volume concentration in the electrospinning solution was 15% (g / mL).

[0077] 2). Electrospinning. Put the electrospinning solution prepared in step 1) into the liquid storage device of the electrospinning equipment at a temperature of 50°C. The nozzles are connected, the spinneret is fixed, and a non-woven fabric is placed on a metal plate as a collector. Adjust the distance between the spinneret and the collecting plate to be 15cm; the ambient temperature for spinning is 50°C, including the temperature of the electrospinning solution in the liquid storage device and the temperature of the collecting plate are both 50°C, and the air flow rate in the environment is controlled at 0.5~0.8m 3 / h; turn on the high-volta...

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Abstract

The invention relates to a hyperfiltration membrane or nanofiltration membrane with a multi-layered composite structure and a preparation method thereof. The hyperfiltration membrane or nanofiltration membrane is a polymer electrostatic spinning nanofiber membrane layer characterized in strong chemical resistance prepared through an electrostatic spinning method, a hydrophilic polymer ultra-thin separation layer obtained through interfacial polymerization, and a functional group surface modification functional layer formed through the grafting reaction of reactant gases on the surfaces of hydrophilic polymers, or a long-chain polymer surface modification functional layer formed through the grafting reaction of the reaction gases on the surfaces of the hydrophilic polymers, or a functionalgroup-containing long-chain polymer surface modification functional layer through the grafting reaction of the reaction gases with the functional groups on the surfaces of the hydrophilic polymers. The hyperfiltration membrane or nanofiltration membrane with the multi-layered composite structure has the advantages of high water flux, high cutting rate and stable chemical performances. The filtration membrane can be used for the production of domestic water, drinking water or water in special conditions, and is suitable for the medical field, food field, environmental protection field and the like.

Description

technical field [0001] The present invention relates to ultrafiltration membrane or nanofiltration membrane of multi-layer composite structure, and the preparation method of ultrafiltration membrane or nanofiltration membrane, particularly relate to and comprise electrospinning nanofiber layer, interfacial polymerization ultrathin separation layer and surface functional layer composite ultrafiltration or nanofiltration membranes. 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 worse than Grade V, losing its function as a source of drinking water. Now our country's urban wastewater treatment rate is 25%, and a lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D69/12
Inventor 张海源郑建芬赵志国韩志超
Owner INST OF CHEM CHINESE ACAD OF SCI
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