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Preparation method of polytetrafluoroethylene super-hydrophobic membrane

一种聚四氟乙烯膜、聚四氟乙烯的技术，应用在疏水膜材的制备领域，能够解决仅关注成纤模板去除等问题，达到纤维形态和表面完好、强度和韧性提高的效果

Inactive Publication Date: 2018-03-27
CHENGDU BAITU PHARM TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These reports all involve the step of high temperature sintering to remove the fiber-forming support, but these sintering processes only focus on the removal of the fiber-forming template

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add polytetrafluoroethylene emulsion with a solid content of 60% dropwise to a polyacrylic acid aqueous solution with a mass fraction of 15% and stir evenly to prepare a spinning solution. Then the polytetrafluoroethylene precursor film was fabricated by electrospinning method. Winding on a cylindrical support mold with a diameter of 5cm, winding 5 layers, and sending it to a tube furnace with nitrogen gas, the temperature of the sintering process is controlled by a program. Raise the temperature to 373°C with a heating rate of 8°C / min. After reaching the sintering temperature, the temperature of the sintering section is 373°C, and hold for 100 minutes.

[0029] Cooling: Under a flowing nitrogen atmosphere, cool down from 373°C to 180°C at a rate of 8°C / min, keep at 180°C for 80 minutes, and then cool naturally.

[0030] After cooling, take it out and pull out the cylindrical support mold to obtain a cylindrical polytetrafluoroethylene membrane with a thickness of 187 ...

Embodiment 2

[0032] Add polytetrafluoroethylene emulsion with a solid content of 60% dropwise into an aqueous polyacrylic acid solution with a mass fraction of 8% and stir evenly to prepare a spinning solution. Then the polytetrafluoroethylene precursor film was fabricated by electrospinning method. Wound onto a cylindrical support mold with a diameter of 5cm, wound 5 layers, and sent to a tube furnace for ventilation. The temperature of the sintering process was controlled by a program. The heating rate was 6°C / min from room temperature to 150°C. ℃ to 390 ℃, the heating rate is 6 ℃ / min, after reaching the sintering temperature, that is, the temperature of the sintering section is 392 ℃, and the temperature is kept for 10 minutes.

[0033] Cooling: Under the flowing atmosphere of air, cool down from 390°C to 200°C at a rate of 15°C / min, keep at 200°C for 30 minutes, and then cool naturally.

[0034] After cooling, take it out and pull out the cylindrical support mold to obtain a cylindric...

Embodiment 3

[0036] Add polytetrafluoroethylene emulsion with a solid content of 60% dropwise to a polyacrylic acid aqueous solution with a mass fraction of 6%, and stir evenly to prepare a spinning solution. Then the polytetrafluoroethylene precursor film was fabricated by electrospinning method. Wound onto a cylindrical support mold with a diameter of 5cm, wound 5 layers, and sent to a tube furnace with nitrogen gas. The temperature of the sintering process was controlled by a program. Raise the temperature to 376°C with a heating rate of 3°C / min. After reaching the sintering temperature, the temperature of the sintering section is 376°C and keep the temperature for 80 minutes.

[0037] Cooling: Under a flowing nitrogen atmosphere, cool down from 376°C to 190°C at a rate of 5°C / min, keep at 190°C for 40 minutes, and then cool naturally.

[0038] After cooling, take it out and pull out the cylindrical support mold to obtain a cylindrical polytetrafluoroethylene membrane with a thickness ...

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PUM

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Abstract

The invention provides a preparation method of a polytetrafluoroethylene membrane. The preparation method comprises spinning solution preparation, fiber formation and sintering. The preparation methodis characterized in that a fiber formation carrier and a solvent are processed into a solution, the solution is added into a polytetrafluoroethylene emulsion, the fiber formation carrier is polyacrylic acid, the solvent is water, the sintering process utilizes programmed temperature-controlled segmented continuous sintering and comprises that in a flowing atmosphere, the materials are heated fromthe room temperature to 120-200 DEG C at a heating rate of 3-10 DEG C / min, then are subjected to heat preservation at 120-200 DEG C for 30-120min, then are heated from the 120-200 DEG C to 360-400 DEG C at a heating rate of 2-8 DEG C / min and then are subjected to heat preservation at 360-400 DEG C for 5-120min, the sintering product is cooled from 360-400 DEG C to 150-200 DEG C at a rate of 3-15DEG C / min in a flowing atmosphere, is subjected to heat preservation at 150-200 DEG C for 30-120min and then is naturally cooled, and the polytetrafluoroethylene membrane has thickness of 174-222 microns. The beaded ultra-fine fiber polytetrafluoroethylene membrane is formed through the preparation method, forms a hydrophobic surface with a multi-level rough structure, has a surface water contactangle of greater than or equal to 150 degrees and porosity of 80% or more, solves the problem that in the polytetrafluoroethylene precursor membrane sintering, fibers easily collapse, has good fiber morphology and surface integrity and higher strength and toughness and can bear a certain vacuum pressure.

Description

[0001] The application of the present invention is a divisional application with the application number 201410163002.2, the application date of April 22, 2014, and the title of the invention "a method for preparing a polytetrafluoroethylene superhydrophobic membrane". technical field [0002] The invention relates to a preparation method of a separation membrane material used in the separation field, in particular to a preparation method of a hydrophobic membrane material. technical background [0003] Hydrophobicity is an important property of polytetrafluoroethylene (PTFE) materials, and it is the main performance of PTFE porous membranes applied to membrane materials. Although polytetrafluoroethylene material has low surface energy, the water contact angle of smooth polytetrafluoroethylene plane is between 98° and 112°, and the hydrophobic performance is not good. [0004] At present, the biaxial stretching method is mostly used in the preparation of polytetrafluoroethyle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/02B01D67/00B01D61/36
CPCB01D61/364B01D67/0002B01D69/02B01D71/36B01D2325/38
Inventor 姚永毅钟丕叶雷
Owner CHENGDU BAITU PHARM TECH CO LTD
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