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Method for hydrophilicity modification of polytetrafluoroethylene hollow fiber microporous membrane

A polytetrafluoroethylene, hydrophilic modification technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of inconspicuous modification of water flux and unsustainable modification effect, and meet the modification conditions Ease of control, performance improvement, and mild reaction conditions

Inactive Publication Date: 2019-04-12
XINJIANG DELAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For this reason, the present invention provides a method for hydrophilic modification of polytetrafluoroethylene hollow fiber microporous membranes, in order to overcome the problems in the prior art that the modification of water flux is not obvious and the modification effect is not durable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The first step: Ultrasonic cleaning of PTFE hollow fiber microporous membrane

[0023] After sorting a certain amount of polytetrafluoroethylene hollow fiber microporous membrane, put it in absolute ethanol for ultrasonic cleaning, stop ultrasonic cleaning after 5 minutes, take out the polytetrafluoroethylene hollow fiber microporous membrane and dry it in the air.

[0024] Step 2: Preparation of Nonionic Surfactant Solution

[0025] Accurately weigh 2 g of nonionic surfactant in a conical flask, add a certain amount of dichloromethane, stir on a magnetic stirrer until completely dissolved, and then make a 2 g / L solution with deionized water.

[0026] The third step: PTFE hollow fiber microporous membrane soaking

[0027] Soak the polytetrafluoroethylene hollow fiber microporous membrane obtained by ultrasonication in the first step in the nonionic surfactant solution of the second step, take out the polytetrafluoroethylene hollow fiber microporous membrane after soaki...

Embodiment 2

[0031] The first step: Ultrasonic cleaning of PTFE hollow fiber microporous membrane

[0032] After sorting a certain amount of polytetrafluoroethylene hollow fiber microporous membrane, put it in absolute ethanol for ultrasonic cleaning, stop ultrasonic cleaning after 5 minutes, take out the polytetrafluoroethylene hollow fiber microporous membrane and dry it in the air.

[0033] Step 2: Preparation of Nonionic Surfactant Solution

[0034] Accurately weigh 3 g of nonionic surfactant in a conical flask, add a certain amount of dichloromethane, stir on a magnetic stirrer until completely dissolved, and then make a 3 g / L solution with deionized water.

[0035] The third step: PTFE hollow fiber microporous membrane soaking

[0036] Soak the polytetrafluoroethylene hollow fiber microporous membrane obtained by ultrasonication in the first step in the nonionic surfactant solution of the second step, take out the polytetrafluoroethylene hollow fiber microporous membrane after soaki...

Embodiment 3

[0040] The first step: Ultrasonic cleaning of PTFE hollow fiber microporous membrane

[0041] After sorting a certain amount of polytetrafluoroethylene hollow fiber microporous membrane, put it in absolute ethanol for ultrasonic cleaning, stop ultrasonic cleaning after 5 minutes, take out the polytetrafluoroethylene hollow fiber microporous membrane and dry it in the air.

[0042] Step 2: Preparation of Nonionic Surfactant Solution

[0043] Accurately weigh 4 g of nonionic surfactant in a conical flask, add a certain amount of dichloromethane, stir on a magnetic stirrer until completely dissolved, and then use deionized water to make a 4 g / L solution.

[0044] The third step: PTFE hollow fiber microporous membrane soaking

[0045] Soak the polytetrafluoroethylene hollow fiber microporous membrane obtained by ultrasonication in the first step in the nonionic surfactant solution of the second step, take out the polytetrafluoroethylene hollow fiber microporous membrane after soa...

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Abstract

The invention relates to a method for hydrophilicity modification of a polytetrafluoroethylene hollow fiber microporous membrane, comprising the following steps: step 1, conducting ultrasonic cleaningon the polytetrafluoroethylene hollow fiber microporous membrane; step 2, preparing a nonionic surfactant solution; and step 3, soaking the ultrasonically cleaned membrane fibers in the step 1 in thenonionic surfactant solution prepared in step 2, after a certain time, taking the soaked membrane fibers out, and conducting natural drying and storage. The reaction only occurs on the surfaces of the membrane fibers, when the performance is improved, the inherent performance of the membrane fibers is not affected; the modification process is carried out in the aqueous phase, the reaction conditions are mild, the modification process and the modification conditions are easily controlled, the operation steps are simple, the whole modification process does not generate a large amount of harmfulwaste liquid, and the method is friendly to environment, free of pollution, energy-saving and high-efficiency, the hydrophilicity is maintained for a long time, and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of water treatment of polytetrafluoroethylene hollow fiber microporous membranes, and in particular relates to a method for hydrophilic modification of polytetrafluoroethylene hollow fiber microporous membranes. Background technique [0002] Membrane separation technology is a new type of separation technology developed in recent years. It is a method of separating mixtures by using a specially manufactured, selectively permeable membrane and driven by external force. It is different at the molecular level. A technology that selectively separates a mixture of particles of particle size when passing through a semipermeable membrane. Among them, the hollow fiber membrane has the advantages of high packing density per unit volume, high filtration and separation efficiency, small equipment, simple structure, and easy operation, and is widely used in separation technologies such as microfiltration, ultrafiltratio...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D71/36B01D69/02B01D67/00
CPCB01D67/0002B01D69/02B01D69/08B01D71/36B01D2325/36
Inventor 曾凡付王晓龙许白羽姚永杰
Owner XINJIANG DELAND
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