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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

Inactive Publication Date: 2020-10-23
陈超
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polytetrafluoroethylene (PTFE) has the reputation of the king of plastics and has the highest strength among existing membrane materials. Therefore, PTFE has natural advantages as a support layer for nanofiltration membranes. The surface microstructure of PTFE microporous membranes is different from that of Microporous membranes of other materials, the surface of microporous membranes of other materials is dispersed with micropores that allow water molecules to pass through, while the surface microstructure of polytetrafluoroethylene microporous membranes is a fiber-node structure, that is, the surface has more strips Cracks, water molecules seep through the strip cracks of the PTFE microporous membrane, but the strip cracks on the surface of the PTFE microporous membrane have a larger size than the circular pores on the surface of the general microporous membrane , in the process of coating the polytetrafluoroethylene microporous membrane with macromolecular organic matter to prepare the filtration separation membrane, the macromolecular organic matter can penetrate into the larger-sized strip cracks on the surface of the polytetrafluoroethylene microporous membrane, resulting in polytetrafluoroethylene The clogging of the membrane pores of the vinyl membrane leads to a decrease in the water flux of the composite nanofiltration membrane

Method used

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  • Preparation method of high-flux polytetrafluoroethylene composite nanofiltration membrane
  • Preparation method of high-flux polytetrafluoroethylene composite nanofiltration membrane

Examples

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Effect test

Embodiment 1

[0024] The preparation method of high flux polytetrafluoroethylene composite nanofiltration membrane comprises the following steps:

[0025]S1. Measure equal volumes of deionized water and absolute ethanol and mix them to obtain a mixed solution of deionized water and ethanol. Add sodium alginate to the mixed solution of deionized water and ethanol to prepare a sodium alginate solution with a mass concentration of 4.0%. , add dropwise a hydrochloric acid solution with a concentration of 0.5mol / L to the sodium alginate solution to adjust the pH to 5, immerse the hydrophobic polytetrafluoroethylene microporous membrane in the sodium alginate solution, and then add glutaraldehyde crosslinking agent, glutaraldehyde The amount of aldehyde added is 3.5wt% of sodium alginate, heated to 50°C in a water bath, kept for 2.5 hours, and then placed in an oven and dried at 50°C to obtain an activated hydrophilic polytetrafluoroethylene microporous membrane;

[0026] S2. Add quartz glass fib...

Embodiment 2

[0031] The preparation method of high flux polytetrafluoroethylene composite nanofiltration membrane comprises the following steps:

[0032] S1. Measure equal volumes of deionized water and absolute ethanol and mix them to obtain a mixed solution of deionized water and ethanol, add sodium alginate to the mixed solution of deionized water and ethanol to prepare a sodium alginate solution with a mass concentration of 2.0% , add dropwise a hydrochloric acid solution with a concentration of 0.5 mol / L to the sodium alginate solution to adjust the pH to 4, immerse the hydrophobic polytetrafluoroethylene microporous membrane in the sodium alginate solution, and then add glutaraldehyde crosslinking agent, glutaraldehyde The amount of aldehyde added is 3.5wt% of sodium alginate, heated to 60°C in a water bath, kept for 2 hours, and then dried in an oven at 50°C to obtain an activated hydrophilic polytetrafluoroethylene microporous membrane;

[0033] S2. Add quartz glass fiber and silan...

Embodiment 3

[0038] The preparation method of high flux polytetrafluoroethylene composite nanofiltration membrane comprises the following steps:

[0039] S1. Measure equal volumes of deionized water and absolute ethanol and mix them to obtain a mixed solution of deionized water and ethanol, add sodium alginate to the mixed solution of deionized water and ethanol to prepare a sodium alginate solution with a mass concentration of 5.0% , add dropwise a hydrochloric acid solution with a concentration of 0.5mol / L to the sodium alginate solution to adjust the pH to 4.5, immerse the hydrophobic polytetrafluoroethylene microporous membrane in the sodium alginate solution, and then add glutaraldehyde crosslinking agent, glutaraldehyde The amount of aldehyde added is 3.5wt% of sodium alginate, heated to 55°C in a water bath, kept for 3 hours, and then placed in an oven and dried at 50°C to obtain an activated hydrophilic polytetrafluoroethylene microporous membrane;

[0040] S2. Add quartz glass fib...

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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.

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

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/12B01D69/10B01D69/02B01D67/00B01D61/00B01D71/36B01D71/02
CPCB01D61/027B01D67/0079B01D69/02B01D69/105B01D69/12B01D71/024B01D71/027B01D71/36B01D71/68B01D2325/02B01D2325/36
Inventor 陈超
Owner 陈超
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