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Preparation method of high-flux and high-strength polytetrafluoroethylene water body filtration composite nanofiltration membrane

A technology of polytetrafluoroethylene and composite nanofiltration membranes, which is applied in chemical instruments and methods, membranes, membrane technologies, etc., can solve the problems of basement membrane rupture and decrease in the strength of polytetrafluoroethylene basement membranes, and achieve control of reaction time, Improves water flux and avoids the effect of reducing infiltration efficiency

Inactive Publication Date: 2020-08-21
陈奎东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the PTFE-based membrane is bombarded by high-energy particles during the plasma treatment process, resulting in a sharp drop in the strength of the PTFE-based membrane, and it is easy to cause the base membrane to rupture during the continuous water pressure filtration process.

Method used

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  • Preparation method of high-flux and high-strength polytetrafluoroethylene water body filtration composite nanofiltration membrane
  • Preparation method of high-flux and high-strength polytetrafluoroethylene water body filtration composite nanofiltration membrane
  • Preparation method of high-flux and high-strength polytetrafluoroethylene water body filtration composite nanofiltration membrane

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Experimental program
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Effect test

Embodiment 1

[0027] A method for preparing a high-throughput and high-strength polytetrafluoroethylene composite nanofiltration membrane for water filtration, comprising the following steps:

[0028] S1. Hydrophilic modification treatment of hydrophobic PTFE microfiltration membrane:

[0029] Put the hydrophobic polytetrafluoroethylene microfiltration membrane into absolute ethanol for ultrasonic cleaning, dry, and set aside;

[0030] Add an aqueous solution of hydrochloric acid with a mass concentration of 10% into absolute ethanol at a ratio of 1:3 by volume, and stir evenly to obtain solution a. Add tetrabutyl titanate and nano silicon dioxide into absolute ethanol, tetratitanate The mass ratio of butyl ester to nano silicon dioxide is 1:0.4, the mass volume ratio of tetrabutyl titanate to absolute ethanol is 1g / 50mL, ultrasonic oscillation is carried out to obtain solution b, and the above-mentioned dried polytetrafluoroethylene micro Immerse the filter membrane in solution b, then sl...

Embodiment 2

[0037] A method for preparing a high-throughput and high-strength polytetrafluoroethylene composite nanofiltration membrane for water filtration, comprising the following steps:

[0038] S1. Hydrophilic modification treatment of hydrophobic PTFE microfiltration membrane:

[0039] Put the hydrophobic polytetrafluoroethylene microfiltration membrane into absolute ethanol for ultrasonic cleaning, dry, and set aside;

[0040] Add an aqueous solution of hydrochloric acid with a mass concentration of 10% into absolute ethanol at a ratio of 1:3 by volume, and stir evenly to obtain solution a. Add tetrabutyl titanate and nano silicon dioxide into absolute ethanol, tetratitanate The mass ratio of butyl ester to nano silicon dioxide is 1:0.3, the mass volume ratio of tetrabutyl titanate to absolute ethanol is 1g / 50mL, ultrasonic oscillation is carried out to obtain solution b, and the above-mentioned dried polytetrafluoroethylene micro Immerse the filter membrane in solution b, then sl...

Embodiment 3

[0047] A method for preparing a high-throughput and high-strength polytetrafluoroethylene composite nanofiltration membrane for water filtration, comprising the following steps:

[0048] S1. Hydrophilic modification treatment of hydrophobic PTFE microfiltration membrane:

[0049] Put the hydrophobic polytetrafluoroethylene microfiltration membrane into absolute ethanol for ultrasonic cleaning, dry, and set aside;

[0050] Add an aqueous solution of hydrochloric acid with a mass concentration of 10% into absolute ethanol at a ratio of 1:3 by volume, and stir evenly to obtain solution a. Add tetrabutyl titanate and nano silicon dioxide into absolute ethanol, tetratitanate The mass ratio of butyl ester to nano silicon dioxide is 1:0.5, the mass volume ratio of tetrabutyl titanate to absolute ethanol is 1g / 50mL, ultrasonic oscillation is carried out to obtain solution b, and the above-mentioned dried polytetrafluoroethylene micro Immerse the filter membrane in solution b, then sl...

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Abstract

The invention relates to the technical field of polytetrafluoroethylene membrane filtration, and discloses a preparation method of a high-flux and high-strength polytetrafluoroethylene water body filtration composite nanofiltration membrane. The preparation method comprises the following steps: S1, performing hydrophilic modification treatment on a hydrophobic polytetrafluoroethylene microfiltration membrane; S2, preparing a water phase solution and an organic phase solution; S3, putting the hydrophilic polytetrafluoroethylene microfiltration membrane in step S1 into the organic phase solutionfor soaking, taking out the hydrophilic polytetrafluoroethylene microfiltration membrane, sucking the redundant organic phase solution on the surface of the hydrophilic polytetrafluoroethylene by using sponge, then putting the hydrophilic polytetrafluoroethylene microfiltration membrane into a sodium alginate solution for soaking, and then putting the hydrophilic polytetrafluoroethylene microfiltration membrane into the water phase solution for an interfacial polymerization reaction to obtain a nanofiltration membrane intermediate; and S4, carrying out heat drying treatment on the nanofiltration membrane intermediate to obtain the composite nanofiltration membrane. The polytetrafluoroethylene composite nanofiltration membrane prepared in the invention has high strength and high permeationflux, so the water pressure resistance and the filtering efficiency of the composite nanofiltration membrane are improved.

Description

technical field [0001] The invention relates to the technical field of polytetrafluoroethylene membrane filtration, in particular to a preparation method of a high-throughput and high-strength polytetrafluoroethylene water filtration composite nanofiltration membrane. Background technique [0002] Nanofiltration (NF) is a new type of membrane separation technology that has been developed in the past 30 years and is separated by pressure. The pore size range of the nanofiltration membrane is between the reverse osmosis (RO) membrane and the ultrafiltration (UF) membrane, and the pore size is about 1-2nm. The interfacial polymerization method is currently the most widely used preparation method for the preparation of composite nanofiltration membranes. Through the polymerization and cross-linking reaction of aqueous phase monomers and organic phase monomers on the surface of the microporous base membrane, a layer with filtration properties is synthesized on the surface of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/36B01D67/00B01D61/00
CPCB01D61/027B01D67/0006B01D69/12B01D71/36B01D2325/36
Inventor 陈奎东
Owner 陈奎东
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