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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 difficulty in processing, and achieves excellent selection effect, simple structure, and long service life. long 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, 300nm<pore diameter<600nm, 200nm<stem diameter<400nm, 70nm<stem hole diameter<150nm; The porosity is 80±10%, the porosity of the stem pores is 30±15%; the total surface area of ​​the stem, stem area:stem hole area=15-30:1. 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 , to obtain the respective areas, the ratio...

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 400-500nm, the stem diameter is 250-350nm, and the stem pore diameter is 80-120nm; The porosity is 80-85%, the porosity of the stem hole is 30-35%; the total surface area of ​​the stem, stem area:stem hole area=24-28:1. The inner diameter is 0.3-1.4mm, and the film thickness is 120-150µm.

[0035] The hydrophobic angle of the obtained material is 160-171°. The obtained PTFE material is subjected to membrane distillation of high-concentration acrylonitrile wastewater, which has excellent performance and effect suitable for industrial production. The water quality after treatment is far better than the discharge standard. Membrane distillation flux > 20L / m2·h, the rejection rate is stable above 99%, continuous membrane distillation for 3-4 months, the flux drops to 65-72% of the original flux, th...

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 480nm, the stem diameter is 280nm, and the stem pore diameter is 95nm; wherein the porosity of the pores is 83%, The porosity of the stem pores is 31%; the total surface area of ​​the stem, stem area:stem hole area=26:1. The inner diameter is 1.2mm and the film thickness is 130µm.

[0038]The resulting material had a hydrophobic angle of 170°. The obtained PTFE material is subjected to membrane distillation of high-concentration acrylonitrile wastewater, which has excellent performance and effect suitable for industrial production. The water quality after treatment is far better than the discharge standard. Membrane distillation flux > 20L / m2·h, the rejection rate is stable above 99%, continuous membrane distillation for 3-4 months, the flux drops to 65-72% of the original flux, the color o...

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PUM

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Abstract

The invention provides a PTFE (polytetrafluoroethylene) hollow fiber membrane. The PTFE hollow fiber membrane adopts a 3D communicated pore structure, stem holes are formed in stems surrounding pores,the diameter of pores is larger than 300 nm and smaller than 600 nm, the diameter of stems of larger than 200 nm and smaller than 400 nm, and diameter of stem holes is larger than 70 nm and smaller than 150 nm; the porosity of pores is 80% plus / minus 10%, and the porosity of stem holes is 30% plus / minus 15%; the ratio of the total surface area of stems to the total surface area of stem holes is (15-30):1; the inner diameter is not larger than 2 mm. The PTFE 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): B01D71/36B01D69/08B01D69/02B01D67/00B01D61/36
CPCB01D61/364B01D67/0004B01D69/02B01D69/08B01D71/36B01D2323/39B01D2325/02B01D2325/04B01D2325/38
Inventor 周涛孙琦叶雷
Owner CHONGQING RUNZE PHARM CO LTD
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