Preparation method of high-flux polytetrafluoroethylene composite nanofiltration membrane

A technology of polytetrafluoroethylene and composite nanofiltration membrane, which is applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as clogging and reduction of water flux of composite nanofiltration membrane, so as to improve filtration efficiency and improve water quality. Flux, breakage-avoiding effects
CN111804162AInactive Publication Date: 2020-10-23陈超
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
陈超
Publication Date
2020-10-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the technical field of membrane filtration, and discloses a preparation method of a high-flux polytetrafluoroethylene composite nanofiltration membrane. The preparation methodcomprises the following steps: S1, carrying out activation modification on a hydrophobic polytetrafluoroethylene microporous membrane by utilizing sodium alginate to obtain a hydrophilic polytetrafluoroethylene microporous membrane; S2, carrying out surface modification treatment on the quartz glass fibers by utilizing a silane coupling agent; S3, grafting trihydroxy quaternary ammonium salt to the surface of the quartz glass fiber to obtain modified quartz glass fiber; S4, depositing the modified quartz glass fiber on a hydrophilic polytetrafluoroethylene microporous membrane by a standing adsorption method to form a fiber net so as to obtain a pretreated polytetrafluoroethylene microporous membrane; and S5, coating the surface of the pretreated polytetrafluoroethylene microporous membrane with a polyethersulfone membrane casting solution, and drying to form the membrane. In the preparation process of the polytetrafluoroethylene composite nanofiltration membrane, macromolecular organic substances can be prevented from permeating into the polytetrafluoroethylene composite nanofiltration membrane from cracks in the surface of the polytetrafluoroethylene microporous membrane to block membrane holes so that the water flux of polytetrafluoroethylene composite nanofiltration is improved.
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Description

technical field

[0001] The invention relates to the technical field of membrane filtration, in particular to a preparation method of a high-throughput polytetrafluoroethylene composite nanofiltration membrane. Background technique

[0002] Membrane separation technology is a high-tech technology of multidisciplinary cross-permeation. Because of its advantages of high efficiency, energy saving and no phase change, it has become an important technology in the field of separation and purification. It is widely used in food and beverage processing, industrial sewage treatment, and large-scale air separation. , hydrometallurgical technology, production of gas and liquid fuels, and production of petrochemical products. In the development process of membrane separation technology, ultrafiltration, microfiltration and reverse osmosis technologies have been relatively mature, but with the continuous development and progress of membrane separation technology, ultrafiltration and rever...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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