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Preparation method of composite polytetrafluoroethylene nano-filtration membrane

A polytetrafluoroethylene and composite nanofiltration membrane technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of complex structure and complex preparation process of nanofiltration membranes

Active Publication Date: 2015-02-04
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bonds of each layer form a stable chemical bond, which has excellent compression resistance and mechanical strength. The structure of the nanofiltration membrane is too complicated, and the preparation process is too complicated

Method used

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  • Preparation method of composite polytetrafluoroethylene nano-filtration membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Activation: Submerge the hydrophobic polytetrafluoroethylene flat membrane in a 0.1% mass concentration of sodium dodecylbenzenesulfonate aqueous solution for 12 hours; take it out and dry it in the air to obtain an active base membrane;

[0028] (2) Water phase impregnation: immerse the active base film described in step (1) in an aqueous solution of 0.1% piperazine by mass concentration, stay for 30 minutes, take it out and dry it in the air to obtain the intermediate film 1;

[0029] (3) Oil phase impregnation: immerse the intermediate film 1 described in step (2) in the n-hexane solution of trimesoyl chloride with a mass concentration of 0.1%, stay for 30 minutes, and then place it in the air to dry to obtain the intermediate film 2 ;

[0030] (4) Water phase impregnation: immerse the intermediate membrane 2 described in step (3) in an aqueous solution of piperazine with a mass concentration of 3.0%, stay for 10 minutes, take it out and dry it to obtain the inte...

Embodiment 2

[0035] (1) Activation: Submerge the hydrophobic polytetrafluoroethylene flat film in a 4.0% mass concentration of sodium dodecylbenzenesulfonate aqueous solution for 5 minutes; take it out and dry it in the air to obtain an active base film;

[0036] (2) Water phase impregnation: immerse the active base film described in step (1) in an aqueous solution of 5.0% by mass concentration of p-phenylenediamine, stay for 5 seconds, take it out and dry it in the air to obtain the intermediate film 1;

[0037] (3) Oil phase impregnation: immerse the intermediate film 1 described in step (2) in a toluene solution of 5.0% mass concentration of isophthaloyl chloride, stay for 5 seconds, and then place it in the air to dry to obtain the intermediate film 2 ;

[0038](4) Water-phase impregnation: immerse the intermediate film 2 described in step (3) in an aqueous solution of 0.1% p-phenylenediamine in mass concentration, stay for 30 minutes, take it out and dry it to obtain the intermediate ...

Embodiment 3

[0043] (1) Activation: Submerge the hydrophobic polytetrafluoroethylene flat membrane in a 2.0% mass concentration of sodium dodecylbenzenesulfonate aqueous solution for 1 hour; take it out and dry it in the air to obtain an active base membrane;

[0044] (2) Water phase impregnation: immerse the active base film described in step (1) in an aqueous solution of ethylenediamine with a mass concentration of 3.0%, stay for 10 minutes, take it out and dry it in the air to obtain the intermediate film 1;

[0045] (3) Oil phase impregnation: immerse the intermediate film 1 described in step (2) in a n-heptane solution of 3.0% by mass concentration of terephthaloyl chloride, stay for 10 minutes, and then place it in the air to dry to obtain an intermediate membrane2;

[0046] (4) Water phase immersion: immerse the intermediate membrane 2 described in step (3) in an aqueous solution of 5.0% mass concentration of ethylenediamine, stay for 5 seconds, take it out and dry it to obtain the ...

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Abstract

The invention discloses a preparation method of a composite polytetrafluoroethylene nano-filtration membrane. After a hydrophobic polytetrafluoroethylene micro-pore membrane is activated, the composite polytetrafluoroethylene nano-filtration membrane is obtained by virtue of water-phase soaking and oil-phase soaking. The polytetrafluoroethylene micro-pore membrane has the characteristics that the strength is high and an additional supporting layer is not needed, and thus the membrane preparation process is relatively simple. Furthermore, by virtue of a unique node-fibril micropore structure of the polytetrafluoroethylene micro-pore membrane, the bonding strength between a base membrane and a nano-filtration modified layer is greatly improved, so that the performance of the composite nano-filtration membrane is improved. The prepared composite polytetrafluoroethylene nano-filtration membrane can be used for treating wastewater in severe environments of strong acid, strong alkali, high temperature and the like, and application occasions of an existing nano-filtration membrane are expanded.

Description

technical field [0001] The invention relates to a preparation method of a composite nanofiltration membrane, in particular to a preparation method of a polytetrafluoroethylene composite nanofiltration membrane. Background technique [0002] As a new membrane process between reverse osmosis and ultrafiltration, nanofiltration can be used to separate monovalent salts, divalent salts, and components with a molecular weight between 200-2000. In addition, the nanofiltration membrane is carried out at room temperature and will not destroy the various activities of the separated substances. At the same time, it has the advantages of low process osmotic pressure, low operating pressure, low operating cost, and excellent effluent quality. It can be widely used in many fields such as sewage treatment. . [0003] In the current nanofiltration composite membranes, polymers such as polysulfone, polypropylene, and polyvinylidene fluoride are basically used as base membranes, supplemented...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/12B01D67/00B01D61/02
Inventor 唐红艳郭玉海王峰朱海霖张华鹏李华彬
Owner ZHEJIANG SCI-TECH UNIV
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