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PTFE (polytetrafluoroethylene) hollow fiber membrane and preparation method thereof

A polytetrafluoroethylene and fiber membrane technology, which is applied in the field of membrane distillation, can solve the problems of difficulty in taking into account separation accuracy and processing efficiency, difficulty in structure control, and high cost of use, and achieves excellent selection effect, simple structure and convenient operation. Effect

Inactive Publication Date: 2019-03-01
CHONGQING RUNZE PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the relationship between the structure and performance of PTFE membranes has not been thoroughly studied at present, such as the separation accuracy and processing efficiency are difficult to balance; it has a precise microstructure, is easy to be damaged, has a short service life, and high cost of use; Stable performance, difficult structure control and performance improvement, difficult processing, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A polytetrafluoroethylene hollow fiber membrane with a three-dimensional penetrating pore structure, with stem holes on the stems surrounding the pores, the pore diameter is 800±200nm, the stem diameter is 500±100nm, and the stem pore diameter is 175±25nm; the pores of the pores The porosity is 60±10%, the porosity of the stem hole is 55±10%; the total surface area of ​​the stem, stem area:stem hole area=16-30:1. The film thickness is 100-200µm, and the inner diameter is 0.2-2mm.

[0025] Stem surface area image analysis: Photographs of the material were taken with a scanning electron microscope (SEM photographs, 10,000-50,000x magnification). Scan this photo with image processing equipment (the television image processor TVIP-4100II produced by Avionics Corporation of Japan, the television image processor provided by Latock System Engineering Company) separate the stem from the stem hole to obtain the stem and stem hole image, and process the image through software , ...

Embodiment 2

[0034] A polytetrafluoroethylene hollow fiber membrane has a three-dimensional penetrating pore structure, stem holes are arranged on stems surrounding the pores, the pore diameter is 680-730nm, the stem diameter is 420-450nm, and the stem pore diameter is 155-195nm; The porosity is 50-60%, the porosity of the stem hole is 55-60%; the total surface area of ​​the stem, stem area:stem hole area=18-20:1. The inner diameter is 0.3-1.4mm, and the film thickness is 120-150µm.

[0035] The hydrophobic angle of the obtained material is 156-175°. The obtained PTFE material is subjected to membrane distillation: it is used for the treatment of apple juice, and has excellent performance and effect suitable for industrial production. Highly concentrated fruit juice can be obtained without damaging nutrients (such as vitamin C, total acid, TSS, etc.). Membrane distillation flux>25L / m 2 h, the rejection rate is stable above 99%, and the membrane distillation is carried out continuously f...

Embodiment 3

[0037] A polytetrafluoroethylene hollow fiber membrane has a three-dimensional penetrating pore structure, stem holes are arranged on the stems surrounding the pores, the pore diameter is 700nm, the stem diameter is 425nm, and the stem pore diameter is 165nm; wherein the porosity of the pores is 58%, The porosity of the stem pores is 57%; the total surface area of ​​the stem, stem area: stem hole area = 19:1. The inner diameter is 1.2mm and the film thickness is 135µm.

[0038] The hydrophobic angle of the obtained material is 156-175°. The obtained PTFE material is subjected to membrane distillation: it is used for the treatment of apple juice, and has excellent performance and effect suitable for industrial production. Highly concentrated fruit juice can be obtained without damaging nutrients (such as vitamin C, total acid, TSS, etc.). Membrane distillation flux>25L / m 2 h, the rejection rate is stable above 99%, and the membrane distillation is carried out continuously fo...

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Abstract

The invention provides a PTFE (polytetrafluoroethylene) hollow fiber membrane. The PTFE hollow fiber membrane adopts a 3D through pore structure, stem holes are formed in stems surrounding pores, thediameter of pores is 800 plus / minus 200 nm, the diameter of stems is 500 plus / minus 100 nm and the diameter of stem holes is 175 plus / minus 25 nm; the porosity of the pores is 60% plus / minus 10% and the porosity of the stem holes is 55% plus / minus 10%; the ratio of the total surface area of the stems to the total area of the stem holes is (16-30):1; the inner diameter is not larger than 2 mm. ThePTFE hollow fiber membrane has long service life and good treatment efficiency.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene hollow fiber membrane and a preparation method thereof, which are used for separation and are especially suitable for membrane distillation. technical background [0002] Due to its wide temperature range, PTFE has excellent chemical stability, low friction and thermal insulation properties. The separation membrane prepared from PTFE not only has excellent chemical stability, thermal stability It also has excellent waterproof, windproof, moisture permeable, breathable and stable charge storage properties. It has shown excellent performance in the manufacture of protective clothing, bag filter, architectural lighting, etc. A large number of PTFE microporous membranes are used in the National Stadium "Bird's Nest" and the Millennium Dome in the United Kingdom. However, the current PTFE microporous membrane still has disadvantages such as low flux, low filtration precision, easy pollution of membrane po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/08B01D69/02B01D67/00
CPCB01D67/0002B01D69/02B01D69/08B01D71/36B01D2323/39B01D2325/02B01D2325/24B01D2325/28
Inventor 周涛孙琦叶雷
Owner CHONGQING RUNZE PHARM CO LTD
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