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Preparation method of super-hydrophobic polytetrafluoroethylene microporous membrane, membrane prepared by preparation method and application of super-hydrophobic polytetrafluoroethylene microporous membrane

A polytetrafluoroethylene, super-hydrophobic technology, applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve the problem that the high hydrophobicity of the film cannot be guaranteed for a long time, it is prone to breakage and peeling, and the manufacturing process is complicated. question

Active Publication Date: 2015-03-25
南京中科碧盾新膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above literatures describe all surface modification methods, which significantly improve the hydrophobicity of the film by forming a surface modified film on the PTFE film structure, but these processes include extrusion operations for manufacturing PTFE films and The step of forming a surface coating, which complicates the manufacturing process, significantly reduces production efficiency, and also leads to increased production costs
On the other hand, the formed hydrophobic coating is prone to damage and peeling off during long-term operation, so that the high hydrophobicity of the film cannot be guaranteed for a long time

Method used

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  • Preparation method of super-hydrophobic polytetrafluoroethylene microporous membrane, membrane prepared by preparation method and application of super-hydrophobic polytetrafluoroethylene microporous membrane
  • Preparation method of super-hydrophobic polytetrafluoroethylene microporous membrane, membrane prepared by preparation method and application of super-hydrophobic polytetrafluoroethylene microporous membrane
  • Preparation method of super-hydrophobic polytetrafluoroethylene microporous membrane, membrane prepared by preparation method and application of super-hydrophobic polytetrafluoroethylene microporous membrane

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preparation example Construction

[0050] The method for preparing superhydrophobic polytetrafluoroethylene microporous membrane of the present invention mainly comprises the following three steps: 1) polytetrafluoroethylene resin, extrusion aid, superhydrophobic fluorine-containing material and optional solvent are mixed to form paste; 2) extruding the paste to form a nascent film; 3) heat-treating, stretching and sintering the nascent film to form the superhydrophobic polytetrafluoroethylene microporous film. Those skilled in the art can understand that when the compatibility between the polytetrafluoroethylene resin and the superhydrophobic fluorine-containing material is high, it may not be necessary to use a solvent.

[0051] The polytetrafluoroethylene resin used in the present invention preferably has a crystallinity greater than or equal to 98%, and its number average molecular weight is 3 million to 10 million, preferably 4 million to 9 million, more preferably 5 million to 8 million. The polytetrafluo...

Embodiment

[0076] The polytetrafluoroethylene resin used in the following examples is a dispersed polytetrafluoroethylene resin (FR203A) purchased from Sanaifu Company; the extrusion aid isoparaffin is the Isopar G isoparaffin produced by Exxonmobil Company, with a distillation range of 167- 176°C.

[0077] The porosity of the membrane product of the present invention is measured gravimetrically. Specifically, the membrane material prepared by the present invention is immersed in the ethanol solution for 2 hours, so that the ethanol solution is completely immersed in the membrane pores, so as to clean the membrane pores. After cleaning, put the film material in a vacuum oven, dry it at 105°C for 2 hours, weigh it after drying, and record the dry film mass at this time m 1. The dry film was completely wetted with the ethanol solution, and then it was put into deionized water and soaked in deionized water for 24 hours. In the experiment, the deionized water was replaced every 4 hours, so...

Embodiment 1

[0081] Example 1: Preparation of hollow fiber-shaped superhydrophobic polytetrafluoroethylene microporous membrane

[0082] 1000 grams of polytetrafluoroethylene resin and 230 grams of extrusion aid aviation kerosene were fully mixed to form a mixed material. In another container, 160 g of perfluorooctylethyl methacrylate (FMA) / methyl methacrylate (MMA) / methacrylic acid (MAA) terpolymer (PMAA-co-PMMA-co -PFMA) (the fluorine atom weight content of the copolymer is 20%, the number average molecular weight is 10000, and the molar ratio of MMA / MAA substance is 2:1; the preparation method refers to the open literature: Hydrophobicity research of water-based fluorine-containing acrylate copolymer , Modern Chemical Industry, Vol. 27 No. 6, p46-49, June 2007) was dissolved in 600 g of solvent (a mixture of ethanol and acetone with a volume ratio of 2:1), and after it was completely dissolved, it was added to the poly The mixed material of tetrafluoroethylene resin and aviation kerose...

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Abstract

The invention relates to a preparation method of a super-hydrophobic polytetrafluoroethylene microporous membrane. The preparation method comprises the following steps: mixing polytetrafluoroethylene resin, an extrusion aid, a super-hydrophobic fluorine-containing material and an optional solvent to form a paste; and then, extruding the paste to prepare the super-hydrophobic polytetrafluoroethylene microporous membrane. The invention further relates to a super-hydrophobic polytetrafluoroethylene microporous membrane prepared by the preparation method, wherein the super-hydrophobic polytetrafluoroethylene microporous membrane has excellent hydrophobicity and has a water contact angle of 140 degrees. The invention further relates to an application of the super-hydrophobic polytetrafluoroethylene microporous membrane in a contactor.

Description

technical field [0001] The invention relates to a preparation method of a superhydrophobic polytetrafluoroethylene microporous membrane, the superhydrophobic polytetrafluoroethylene microporous membrane prepared by the method, and the application of the microporous membrane in a membrane contactor. Background technique [0002] PTFE material has outstanding chemical stability, excellent high and low temperature resistance and good corrosion resistance, so filter materials made of PTFE can be widely used in separation processes under harsh conditions. At the same time, due to its strong hydrophobicity, PTFE has also become an ideal membrane material for the membrane contactor process. It can be made into a microporous film with a microporous structure and is widely used to remove acidic components in mixed gases ( such as CO 2 , SO 2 ), removal of trace gases in water (such as CO 2 , O 2 or ammonia) and processes such as membrane distillation. [0003] At present, the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/04B01D69/06B01D53/22B01D19/00B01D61/36C02F1/08C02F1/44C02F103/04
CPCY02W10/37
Inventor 曹义鸣孙承贵康国栋吴鸣龙宝玉贾静旋刘丹丹
Owner 南京中科碧盾新膜科技有限公司
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