Preparation method of polyvinylidene fluoride/graphene oxide composite ultrafiltration membrane

A kind of polyvinylidene fluoride, graphene composite technology

Inactive Publication Date: 2016-01-27
山西交控生态环境股份有限公司
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Problems solved by technology

[0003] However, the polyvinylidene fluoride membrane (PVDF) currently used in industrial applications has problems such as poor hydrophilicity, poor oxidation resistance, poor pollution resistance, short service life, and high replacement costs, so it needs to be modified.

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  • Preparation method of polyvinylidene fluoride/graphene oxide composite ultrafiltration membrane

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Embodiment Construction

[0019] A preparation method of polyvinylidene fluoride / graphene oxide composite ultrafiltration membrane: preliminary preparation: (1) spare the following materials: adopt graphene oxide prepared by Hummers oxidation method as hydrophilic additive, polyvinylidene fluoride as membrane substrate, N , N-methylacetamide is used as a solvent, and deionized water is used as a coagulation bath; (2) Dry the material in step (1) in a vacuum oven at 80°C for at least 12 hours to remove the moisture absorbed by the material;

[0020] Production process: ① Accurately weigh a certain mass of graphene oxide, disperse it in N,N-methylacetamide solution, and ultrasonically treat it for at least 10 hours to obtain a fully exfoliated bulk liquid;

[0021] ② Stir and dissolve the polyvinylidene fluoride powder in the N,N-methylacetamide solution at 70°C, mix the graphene oxide dispersion with the polyvinylidene fluoride casting solution, stir for 24 hours, and ultrasonicate for 2 hours, To obtai...

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Abstract

The invention relates to a preparation method of a polyvinylidene fluoride / graphene oxide composite ultrafiltration membrane. The method comprises steps as follows: (1), graphene oxide with certain mass is weighed accurately, dispersed in an N,N-methyl acetamide solution and subjected to ultrasonic treatment for at least 10 h, and a fully stripped dispersion liquid is obtained; (2) polyvinylidene fluoride powder is stirred to be dissolved in the N,N-methyl acetamide solution at the temperature of 70 DEG C, the graphene oxide dispersion liquid and a polyvinylidene fluoride membrane casting liquid are mixed, stirred for 24 h and subjected to ultrasonic treatment for 2 h; (3) the membrane casting liquid is placed in a vacuum environment for full degasing, 200 mu m of the membrane casting liquid is accurately applied to a glass plate in certain size through a membrane scraper, the glass plate stays in the air for 20 s and is immersed in a coagulating bath which is deionized water at the temperature of 20 DEG C, and the phase conversion process is finished; (4) a prepared composite membrane is cleaned for removal of residual solvent. A polyvinylidene fluoride membrane material is modified, so that the application performance of the membrane is improved.

Description

technical field [0001] The invention belongs to the technical field of ultrafiltration membrane preparation, and in particular relates to a preparation method of a polyvinylidene fluoride / graphene oxide composite ultrafiltration membrane. Background technique [0002] Ultrafiltration is an important membrane separation technology, which has been widely used in many fields such as drinking water preparation, food industry, pharmaceutical industry, biotechnology, chemical process and environmental engineering. In ultrafiltration membrane separation technology, the core is the preparation of ultrafiltration membrane. Ultrafiltration membranes are generally made of organic polymer materials, commonly used are cellulose and cellulose derivatives, polysulfone (PS), polyethersulfone (PES), polyvinylidene fluoride (PVDF), polyamide (PA) and polyacrylonitrile (PAN). Among them, polyvinylidene fluoride (PVDF) is a typical polymer material for preparing ultrafiltration separation mem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/12B01D67/00
Inventor 郭瑞王宝亮冯晓伟岳华君赵飞赵凤瑞
Owner 山西交控生态环境股份有限公司
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