PTFE (polytetrafluoroethylene) flat membrane and preparation method thereof

A polytetrafluoroethylene and flat membrane technology is applied in the field of membrane distillation, which can solve the problems of difficulty in taking into account separation accuracy and processing efficiency, difficulty in implementation, and high cost of use, and achieve long-term effective operation, long cleaning cycle, and long service life. 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, with stem holes on the stems surrounding the pores, the pore diameter is 200±100nm, the stem diameter is 125±75nm, and the stem hole diameter is 45±25nm; the pores of the pores The ratio is 60±10%, the porosity of the stem hole is 55±10%; the total surface area of ​​the stem, stem area:stem hole area=15-30:1. 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, magnified 10000-50000 times). Scan this photo with image processing equipment (the television image processor TVIP-4100II that Japan Avionics company produces, the television image processor that Latock system engineering company provides) stem and stem hole are separated to obtain stem and stem hole image, The image is processed by software to obtain the respective areas, and the ratio of the stem area to the...

Embodiment 2

[0035] A polytetrafluoroethylene flat film has a three-dimensional through-hole pore structure, and there are stem holes on the stems surrounding the pores, the pore diameter is 150-250nm, the stem diameter is 100-120nm, and the stem pore diameter is 25-50nm; the pores of the pores The ratio is 55-65%, and the porosity of the stem hole is 50-55%; the total surface area of ​​the stem, stem area:stem hole area=20-26:1. The film thickness is 120-150µm.

[0036] The hydrophobic angle of the obtained material is 162-170°. The obtained PTFE material is subjected to membrane distillation of taurine wastewater at normal temperature, which has excellent properties and effects suitable for industrial production. Taurine can obtain products superior to pharmaceutical standards, and water can reach the standard of medical water for injection. Membrane distillation flux>20L / m 2 h, the rejection rate was stable above 99%, and the membrane distillation was carried out continuously for mor...

Embodiment 3

[0038] A polytetrafluoroethylene flat film has a three-dimensional through-hole pore structure. There are stem holes on the stems surrounding the pores. The pore diameter is 230nm. The porosity of the pores is 52%; the total surface area of ​​the stem, stem area:stem pore area=24:1. The film thickness is 120µm.

[0039] The hydrophobic angle of the obtained material is 168°. The obtained PTFE material is subjected to membrane distillation of taurine wastewater at normal temperature, which has excellent properties and effects suitable for industrial production. Taurine can obtain products superior to pharmaceutical standards, and water can reach the standard of medical water for injection. 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 dropped to 70-75% of the original flux, the color of the material after cleaning was pure white, and the flux returned t...

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Abstract

The invention provides a PTFE (polytetrafluoroethylene) flat membrane. The PTFE flat membrane adopts a 3D communicated pore structure, stem holes are formed in stems surrounding pores, the diameter ofpores is 200 plus/minus 100 nm, the diameter of stems is 125 plus/minus 25 nm, and the diameter of stem holes is 45 plus/minus 25 nm; 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 (15-30):1; the membrane thickness is larger than 10 mu m. 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): B01D71/36B01D69/06B01D69/02B01D67/00B01D61/36
CPCB01D61/364B01D67/0004B01D69/02B01D69/06B01D71/36B01D2323/39B01D2325/02B01D2325/04B01D2325/38
Inventor 周涛孙琦叶雷
Owner CHONGQING RUNZE PHARM CO LTD
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