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A kind of preparation method of polytetrafluoroethylene superhydrophobic film

A technology of polytetrafluoroethylene film and polytetrafluoroethylene, which is applied in the field of preparation of hydrophobic film materials, can solve the problems of only focusing on the removal of fiber-forming templates, and achieve the effect of fiber shape and surface integrity, strength and toughness

Active Publication Date: 2017-09-05
成都百途医药科技有限公司
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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 polytetrafluoroethylene superhydrophobic film

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The polytetrafluoroethylene emulsion with a solid content of 60% was added dropwise to a sodium alginate aqueous solution with a mass fraction of 15%, 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. 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.

[0030] 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.

[0031] After cooling, take it out and pull out the cylindrical support mold to obtain a cylindrical polytetrafluoroethylene membrane with a thic...

Embodiment 2

[0033] The polytetrafluoroethylene emulsion with a solid content of 60% was added dropwise to an aqueous solution of sodium alginate with a mass fraction of 8%, and stirred 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 5 cm, wound 5 layers, and sent to a tube furnace for ventilation. The temperature of the sintering process was controlled by a program. ℃ 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.

[0034] 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.

[0035] After cooling, take it out and pull out the cylindrical support mold to obtain a cylindrical polytetrafluoroethylene membrane with a thi...

Embodiment 3

[0037] The polytetrafluoroethylene emulsion with a solid content of 60% was added dropwise to a sodium alginate aqueous solution with a mass fraction of 6%, 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. 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 hold for 80 minutes.

[0038] 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.

[0039] After cooling, take it out and pull out the cylindrical support mold to obtain a cylindrical polytetrafluoroethylene membrane with a thickn...

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Abstract

The invention provides a preparation method of polytetrafluoroethylene film, which includes dosing of spinning solution, fiber making and sintering, and is characterized in that polytetrafluoroethylene emulsion is added after the fiber-forming carrier and solvent are prepared into a solution, and the fiber-forming carrier It is sodium alginate, the solvent is water; the sintering adopts the program temperature control segmental continuous sintering, under the flow atmosphere, the temperature is raised from room temperature to 120 ℃ ~ 200 ℃ at a rate of 3 ~ 10 ℃ / min, and the temperature is kept at 120 ℃ ~ 200 ℃ 30-120min; heat up from 120-200°C to 360-400°C at a rate of 2-8°C / min, keep warm at 360°C-400°C for 5-120min; cool after sintering, the cooling is in a flowing atmosphere Cool down from 360-400°C to 150-200°C at a rate of 3-15°C / min, keep warm at 150-200°C for 30-120min, and then cool naturally. The present invention has produced the polytetrafluoroethylene film with beaded superfine fibers, forming a hydrophobic surface with a multi-level rough structure together; the surface water contact angle is more than or equal to 150°, and the porosity is as high as more than 80%; and solves the problem of polytetrafluoroethylene In the sintering of the precursor film, the fiber is easy to collapse, the shape and surface of the fiber are intact, the strength and toughness are also greatly improved, and it can withstand a certain vacuum pressure.

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. [0002] 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 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 n...

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 成都百途医药科技有限公司
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