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PTFE (polytetrafluoroethylene) flat membrane and preparation method thereof

A technology of polytetrafluoroethylene and flat membrane, applied in the field of membrane distillation, which can solve the problems of separation precision and processing efficiency, difficulty in processing, and difficulty in realization, etc., achieve long-term effective operation, long cleaning cycle, and increase throughput 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.; when PTFE materials are used in separation applications, how to synergistically match between microstructure and macroscopic morphology to obtain better performance, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A polytetrafluoroethylene flat film with a three-dimensional through-hole pore structure, stem holes surrounding the pore, 300nm<pore diameter<600nm, 200nm<stem diameter<400nm, 70nm<stem hole diameter<150nm; film thickness greater than 10µm; the porosity of the pores is 60±10%, the porosity of the stem pores is 55±10%; the total surface area of ​​the stem, stem area:stem hole area=1-15:1. The film thickness is 100-300µm.

[0026] 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 of the stem area t...

Embodiment 2

[0035] A polytetrafluoroethylene flat film has a three-dimensional through-hole pore structure, stem holes are arranged on stems surrounding the pores, the pore diameter is 500-550nm, the stem diameter is 250-300nm, and the stem pore diameter is 80-100nm; the pores of the pores The ratio is 55-65%, the porosity of the stem hole is 50-55%; the total surface area of ​​the stem, stem area:stem hole area=6-12:1. The film thickness is 120-150µm.

[0036] The hydrophobic angle of the obtained material is 161-172°. The obtained PTFE material is subjected to membrane distillation: it is used for the treatment of concentrated sulfuric acid and high-concentration phenol-containing wastewater, and has excellent performance and effect suitable for industrial production. After treatment, the discharge standard can be reached. Membrane distillation flux>20L / m 2 h, the rejection rate was stable above 99%, and the membrane distillation was carried out continuously for more than 5 months, t...

Embodiment 3

[0038] A polytetrafluoroethylene flat membrane has a three-dimensional through-hole pore structure, with stem holes on the stems surrounding the pores, the pore diameter is 520nm, the stem diameter is 250nm, and the stem pore diameter is 85nm; the porosity of the pores is 57%, and the stem diameter is 520nm. The porosity of the pores is 53%; the total surface area of ​​the stem, stem area:stem pore area=10:1. The film thickness is 140µm.

[0039] The hydrophobic angle of the obtained material is 167°. The obtained PTFE material is subjected to membrane distillation: it is used for the treatment of concentrated sulfuric acid and high-concentration phenol-containing wastewater, and has excellent performance and effect suitable for industrial production. After treatment, the discharge standard can be reached. Membrane distillation flux>20L / m 2h, the rejection rate was stable above 99%, and the membrane distillation was carried out continuously for more than 5 months, the flux ...

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Abstract

The invention provides a PTFE (polytetrafluoroethylene) flat membrane. The PTFE spiral-wound 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 150nm; the membrane thickness is larger than 10 mu m; the porosity of pores is 60% plus / minus 10%, and the porosity of stem holes is 55% plus / minus 10%; the ratio of the total surface area of stems to the total surface area of stem holes is (1-15):1. The PTFE flat membrane has long service life and excellent anti-fouling performance.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene flat 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 pores, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/06B01D69/02B01D67/00
CPCB01D67/0002B01D69/02B01D69/06B01D71/36B01D2323/39B01D2325/02B01D2325/24B01D2325/28
Inventor 周涛孙琦叶雷
Owner CHONGQING RUNZE PHARM CO LTD
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