PTFE (polytetrafluoroethylene) hollow fiber membrane and preparation method thereof

A polytetrafluoroethylene and fiber membrane technology, applied in the field of membrane distillation, can solve the problems of difficult balance between separation accuracy and processing efficiency, difficulty in realizing structure control, and high cost of use, and achieve 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 200±100nm, the stem diameter is 125±75nm, and the stem pore diameter is 45±25nm; the pores of the pores The ratio is 80±10%, the porosity of the stem hole is 30±15%; the total surface area of ​​the stem, stem area: stem hole area=1-15:1; 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, 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...

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 200-250nm, the stem diameter is 80-120nm, and the stem pore diameter is 30-45nm; The porosity is 75-85%, the porosity of the stem hole is 25-30%; the total surface area of ​​the stem, stem area:stem hole area=8-12:1. The inner diameter is 0.3-1.4mm, and the film thickness is 120-150µm.

[0035] The hydrophobic angle of the obtained material is 163-172°. The obtained PTFE material is subjected to membrane distillation at room temperature: the purification and crystallization of hyaluronic acid has excellent properties and effects suitable for industrial production. Products superior to pharmaceutical standards can be obtained, and the water can reach the standard of medical water for injection. Membrane distillation flux>24L / m 2 h, the rejection rate is stable above 99%, and the membrane distil...

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 240nm, the stem diameter is 100nm, and the stem pore diameter is 36nm; the porosity of the pores is 79%, The porosity of the stem hole is 26%; the total surface area of ​​the stem, stem area:stem hole area=9:1. The inner diameter is 1mm, and the film thickness is 125µm.

[0038] The hydrophobic angle of the obtained material is 169°. The obtained PTFE material is subjected to membrane distillation at room temperature: the purification and crystallization of hyaluronic acid has excellent properties and effects suitable for industrial production. Products superior to pharmaceutical standards can be obtained, and the water can reach the standard of medical water for injection. Membrane distillation flux>24L / m 2h, the rejection rate is stable above 99%, and the membrane distillation is carried...

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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 200 plus / minus 100 nm, the diameter of stems is 125 plus / minus 75 nm and the diameter of stem holes is 45 plus / minus 25 nm; the porosity of the pores is 80% plus / minus 10% and theporosity of the stem holes is 30% plus / minus 15%; the ratio of the total surface area of the stems to the total area of the stem holes is (1-15):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
CPCB01D61/364B01D67/0004B01D69/02B01D69/08B01D71/36B01D2323/39B01D2325/02B01D2325/38
Inventor 周涛孙琦叶雷
Owner CHONGQING RUNZE PHARM CO LTD
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