Method for preparing graphene oxide and polyving akohol composite membrane through electrostatic spinning

A polyvinyl alcohol and electrospinning technology, which is used in textiles and papermaking, filament/thread forming, fiber processing, etc., can solve the problems of poor wet film strength, poor water resistance, and poor wet film strength of polyvinyl alcohol films. Achieve the effect of improving wet film strength and water resistance, increasing porosity and specific surface area, and improving mechanical strength

Inactive Publication Date: 2014-07-23
JIANGNAN GRAPHENE RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are defects such as low separation efficiency, poor wet film strength, and poor water resistance of polyvinyl alcohol membranes, which restrict the application of polyvinyl alcohol membranes to a certain extent.
The traditional method of preparing polyvinyl alcohol film usually adopts the solution casting method (Cai Bangxiao, Zhang Peiqin. Journal of East China University of Science and Technology: Natural Science Edition, 2006,32(2):235-240.), but the polyvinyl alcohol produced by the solution casting method The membrane has disadvantages such as uneven pore size distribution, small specific surface area, and low separation efficiency.
Therefore, the biggest challenge in the preparation and application of polyvinyl alcohol membranes is how to solve the defects of poor wet film strength and water re

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Add 1g of graphene oxide to 100g of deionized water, and ultrasonically disperse for 0.5h to obtain a uniformly dispersed graphene oxide aqueous solution, and then mix the obtained uniformly dispersed graphene oxide aqueous solution with 6.447g of polyvinyl alcohol, and then Under the condition of a stirring speed of 30 revolutions / min, the mixed solution was heated to 60° C., kept reacting for 2 hours, and cooled to room temperature to obtain a spinning stock solution of graphene oxide and polyvinyl alcohol with a mass fraction of polyvinyl alcohol of 6%.

[0014] Then the spinning stock solution of graphene oxide and polyvinyl alcohol is electro-spinned at a temperature of 20°C, a spinning voltage of 8kV, a flow rate of 0.01mL / h, a spinning receiving distance of 8cm, a receiving roller speed of 100rpm, and a needle traveling back and forth. 20cm / min, time 12h, obtain graphene oxide and polyvinyl alcohol composite film.

[0015] Then the graphene oxide and polyvi...

Embodiment 2

[0017] Example 2: Add 0.7g of graphene oxide to 100g of deionized water, and ultrasonically disperse for 0.75h to obtain a uniformly dispersed graphene oxide aqueous solution, and then mix the obtained uniformly dispersed graphene oxide aqueous solution with 7.947g of polyvinyl alcohol, Then, under the condition of a stirring speed of 80 revolutions / min, the mixed solution was heated to 70°C, kept reacting for 4 hours, and cooled to room temperature to obtain a spinning stock solution of graphene oxide and polyvinyl alcohol with a mass fraction of polyvinyl alcohol of 7.315% .

[0018] Then the spinning stock solution of graphene oxide and polyvinyl alcohol is electro-spinned at a temperature of 20°C, a spinning voltage of 8kV, a flow rate of 0.01mL / h, a spinning receiving distance of 8cm, a receiving roller speed of 100rpm, and a needle traveling back and forth. 20cm / min, time 12h, obtain graphene oxide and polyvinyl alcohol composite film. Then the graphene oxide and polyvinyl...

Embodiment 3

[0020] Example 3: Add 0.2 g of graphene oxide to 100 g of deionized water, and ultrasonically disperse for 1 hour to obtain a uniformly dispersed graphene oxide aqueous solution, and then mix the obtained uniformly dispersed graphene oxide aqueous solution with 10.133g of polyvinyl alcohol, and then Under the condition of a stirring speed of 120 revolutions / min, the mixed solution was heated to 80° C., kept reacting for 6 hours, and cooled to room temperature to obtain a spinning stock solution of graphene oxide and polyvinyl alcohol with a polyvinyl alcohol mass fraction of 9.814%.

[0021] Then the spinning stock solution of graphene oxide and polyvinyl alcohol is electro-spinned at a temperature of 30°C, a spinning voltage of 16kV, a flow rate of 1mL / h, a spinning receiving distance of 12cm, a receiving roll speed of 500rpm, and a needle traveling speed of 30cm / min, time 24h, obtain graphene oxide and polyvinyl alcohol composite film. Then the graphene oxide and polyvinyl alc...

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PUM

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Abstract

The invention relates to a method for preparing a graphene oxide and polyving akohol composite membrane through electrostatic spinning. The method comprises the steps that graphene oxide is added into deionized water, ultrasonic dispersion is conducted, the evenly-dispersed graphene oxide aqueous solution and polyving akohol are mixed, the mixed solution is heated and reacts for a period of time on the condition of stirring, the mixed solution is cooled to reach indoor temperature, a spinning solution of the graphene oxide and the polyving akohol is obtained, electrospinning is conducted on the spinning solution of the graphene oxide and the polyving akohol, the graphene oxide and polyving akohol composite membrane is obtained, the graphene oxide and polyving akohol composite membrane is processed in the mixed solution of acetone, deionized water, hydrochloric acid and a cross-linking agent, and then cross-linked graphene oxide and polyving akohol composite membrane is obtained.

Description

Technical field [0001] The present invention relates to a method for preparing a graphene oxide and polyvinyl alcohol composite film by electrostatic spinning, in particular to a spinning stock solution of graphene oxide and polyvinyl alcohol for electrospinning, which is obtained after treatment with a crosslinking agent Graphene oxide and polyvinyl alcohol composite membrane with high separation efficiency, good wet membrane strength and excellent water resistance, which can be used in the field of membrane separation and a preparation method thereof. Background technique [0002] Polyvinyl alcohol has high hydrophilicity, pollution resistance, good chemical stability, thermal stability and film-forming properties. Therefore, polyvinyl alcohol membranes are widely used in membrane separation such as ultrafiltration, nanofiltration, reverse osmosis and pervaporation. Technical field C, Kaya A. Desalination, 2010, 253(1):175-179.). However, polyvinyl alcohol membranes have defe...

Claims

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Application Information

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IPC IPC(8): D04H1/4382D04H1/728D01D5/00
Inventor 贾宝平叶恩洲王秋泽丁建宁
Owner JIANGNAN GRAPHENE RES INST
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