Method for surface hydrophilic modification of polytetrafluoroethylene hollow fiber membrane

A technology of polytetrafluoroethylene and fiber membranes, which is applied in the field of hydrophilic modification of the surface of polytetrafluoroethylene hollow fiber membranes, can solve the problems of a large amount of harmful waste liquid, PTFE matrix damage, and high risk of operation, and achieve improved membrane surface performance effect

Inactive Publication Date: 2016-07-06
SICHUAN UNIV
View PDF8 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, PTFE will release a toxic substance perfluoroisobutylene during the high-temperature melting process, and it is not easy to maintain its shape; the surface of the PTFE film after chemical treatment will obviously darken and affect the performance of the material body, and the process will also produc

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for surface hydrophilic modification of polytetrafluoroethylene hollow fiber membrane
  • Method for surface hydrophilic modification of polytetrafluoroethylene hollow fiber membrane
  • Method for surface hydrophilic modification of polytetrafluoroethylene hollow fiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The first step, dipping in a solution containing sulfonic acid groups

[0047] First soak the PTFE hollow fiber membrane in isopropanol for 30 minutes to carry out short-term hydrophilic modification, and then take it out and immerse it in a sodium dodecylsulfonate (SDS) solution with a concentration of 5wt% for 10 hours. The immersion process is kept airtight to prevent the solution from volatilizing .

[0048] The second step, RF plasma treatment

[0049] Put the above impregnated sample on the quartz support in the reaction chamber to ensure that the hollow fiber membrane is in a suspended state, start the vacuum pump to evacuate to 5Pa, pass in nitrogen to clean and discharge the residual air in the reaction chamber and pipeline, adjust the needle valve control Gas flow at 20cm 3 / min, adjust the air pressure so that the pressure reaches 20Pa, start the RF power source after stabilization, and perform low-temperature plasma treatment on the PTFE hollow fiber membr...

Embodiment 2

[0051] The first step, dipping in the solution containing amino

[0052] First soak the PTFE hollow fiber membrane in isopropanol for 180 minutes for short-term hydrophilic modification, and then take it out and immerse it in a 45wt% ethylenediamine (EDA) solution for 7 hours. The immersion process is kept airtight to prevent the solution from volatilizing.

[0053] The second step, RF plasma treatment

[0054] Put the above impregnated sample on the quartz support in the reaction chamber to ensure that the hollow fiber membrane is in a suspended state, start the vacuum pump to evacuate to 5Pa, pass in nitrogen to clean and discharge the residual air in the reaction chamber and pipeline, adjust the needle valve control Gas flow at 60cm 3 / min, adjust the air pressure to make the pressure reach 80Pa, start the RF power source after stabilization, and perform low-temperature plasma treatment on the PTFE hollow fiber membrane, the processing power is 100W, the RF frequency is 13...

Embodiment 3

[0056] The first step, immersion in the solution containing hydroxyl

[0057] First soak the PTFE hollow fiber membrane in isopropanol for 100 minutes to carry out short-term hydrophilic modification, and then take it out and immerse it in a 30wt% polyvinyl alcohol (PVA) solution for 8 hours. The immersion process is kept airtight to prevent the solution from volatilizing.

[0058] The second step, RF plasma treatment

[0059] Put the above impregnated sample on the quartz support in the reaction chamber to ensure that the hollow fiber membrane is in a suspended state, start the vacuum pump to evacuate to 4Pa, pass in nitrogen to clean and discharge the residual air in the reaction chamber and pipeline, adjust the needle valve control Gas flow at 50cm 3 / min, adjust the air pressure so that the pressure reaches 50Pa, start the RF power source after stabilization, and perform low-temperature plasma treatment on the PTFE hollow fiber membrane. The processing power is 500W, the ...

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
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for the surface hydrophilic modification of a polytetrafluoroethylene hollow fiber membrane. The method comprises the following steps: firstly dipping the polytetrafluoroethylene hollow fiber membrane into a solution containing a hydrophilic group, so that the surface of the membrane is coated with a layer of hydrotropic substance; then processing the polytetrafluoroethylene hollow fiber membrane by utilizing a radio frequency plasma, simultaneously bombarding and etching a membrane body and the hydrotropic substance on the surface of the membrane to generate an active free radical, further initiating and grafting the hydrophilic group to the polytetrafluoroethylene hollow fiber membrane body so as to form a stable hydrophilic layer. According to the method disclosed by the invention, on the premise that the inherent excellent performance of the polytetrafluoroethylene hollow fiber membrane is not affected, the hydrophilic modification is performed on the surface of the membrane, so that the surface hydrophilicity of the polytetrafluoroethylene membrane is greatly improved. Therefore, the application scope of the polytetrafluoroethylene hollow fiber membrane in the membrane separation field is widened.

Description

technical field [0001] The invention relates to a membrane modification method, in particular to a method for hydrophilic modification of the surface of a polytetrafluoroethylene hollow fiber membrane. Background technique [0002] Polytetrafluoroethylene (PTFE) is a membrane separation material with excellent comprehensive properties. It has excellent chemical stability, high temperature resistance, organic solvent resistance, chemical corrosion resistance and good mechanical properties. It is known as the "king of plastics". "Reputation. In addition, compared with other structural types of separation membranes, the hollow fiber membrane has the advantages of large effective area of ​​the membrane, large water flux, compact structure of the membrane module, high packing density, small footprint, and convenient cleaning. Therefore, PTFE Hollow fiber membranes have broad application prospects in the field of membrane separation. [0003] However, due to the material's highl...

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
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B01D69/08B01D69/02B01D67/00B01D71/36
CPCB01D67/0002B01D67/0006B01D69/02B01D69/08B01D71/36B01D2323/34B01D2323/385B01D2323/46
Inventor 陈文清周明宋双张浩凡
Owner SICHUAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap