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A kind of preparation method of superhydrophobic polytetrafluoroethylene fiber membrane

A polytetrafluoroethylene membrane and polytetrafluoroethylene technology are applied in the field of preparation of hydrophobic membrane materials, which can solve the problems of only focusing on fiber-forming template removal, and achieve the effects of intact fiber shape and surface, and improved strength and toughness.

Active Publication Date: 2019-05-17
四川百途环保材料科技有限公司 +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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  • A kind of preparation method of superhydrophobic polytetrafluoroethylene fiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]The polytetrafluoroethylene emulsion with a solid content of 60% is added dropwise to an aqueous solution of polyvinyl alcohol with a mass fraction of 12%, and stirred evenly to form 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, and the temperature is raised from room temperature to 110°C at 10°C / min, kept at 110°C for 90min, and at 7°C The heating rate is raised from 110°C to 290°C / min, the temperature is kept at 290°C for 100 minutes, the temperature is raised from 290°C to 380°C, the heating rate is 6°C / min, and the temperature is kept for 60 minutes.

[0031] 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 natural...

Embodiment 2

[0034] The polytetrafluoroethylene emulsion with a solid content of 60% was added dropwise to an aqueous solution of polyvinyl alcohol with a mass fraction of 9%, and stirred 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. / min The heating rate is raised from 90°C to 260°C, the temperature is kept at 260°C for 120 minutes, the temperature is raised from 260°C to 375°C, the heating rate is 8°C / min, and the temperature is kept for 115 minutes.

[0035] 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.

[0036] After cooling, take it out and pull out the cylindrical support mold to obtain a cylindric...

Embodiment 3

[0038] The polytetrafluoroethylene emulsion with a solid content of 60% is added dropwise to a polyvinyl alcohol aqueous solution with a mass fraction of 5%, and stirred 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. / min The heating rate is raised from 100°C to 275°C, the temperature is kept at 275°C for 110 minutes, the temperature is raised from 275°C to 380°C, the heating rate is 3°C / min, and the temperature is kept for 90 minutes.

[0039] Cooling: Under the flowing air 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.

[0040] After cooling, take it out and pull out the cylindrical support mold to obtain a cylindrical polyte...

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Abstract

The invention provides a preparation method of a polytetrafluoroethylene film. The preparation method comprises the steps of preparing a spinning solution, preparing fibers and sintering and is characterized by adding polytetrafluoroethylene emulsion after preparing a solution with a fiber forming carrier and a solvent, wherein the fiber forming carrier is polyvinyl alcohol, and the solvent is water; adopting multistep continuous sintering through program temperature control, and in flowing atmospheres, insulating at 90-120 DEG C for 30-120 minutes, increasing the temperature from 90-120 DEG C to 260-300 DEG C at a rate of 3-10 DEG C / min and insulating at 260-300 DEG C for 30-120 minutes; increasing the temperature from 260-300 DEG C to 370-390 DEG C at a rate of 2-8 DEG C / min and insulating at 370-390 DEG C for 5-120 minutes; carrying out cooling treatment after sintering: in the flowing atmospheres, reducing the temperature from 360-400 DEG C to 150-200 DEG C at a rate of 3-15 DEG C / min, insulating at 150-200 DEG C for 30-120 minutes and then carrying out natural cooling.

Description

technical field [0001] 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 [0002] 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. [0003] At present, the biaxial stretching method is mostly used in the preparation of polytetrafluoroethylene porous membranes. When this method wants to obtain a film with a higher porosity, the film needs to be stretched at a large scale, the surface structure cannot be controlled, and the film thickness is only less than a dozen microns. Supporting materials are needed in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/36B01D69/02B01D67/00
Inventor 姚永毅钟丕叶雷
Owner 四川百途环保材料科技有限公司
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