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PTFE (polytetrafluoroethylene) separation material

A technology of polytetrafluoroethylene and separation materials, applied in the direction of semi-permeable membrane separation, total evaporation, membrane, etc., can solve the problems of short service life, high cost of use, easy damage, etc., achieve strong fiber form, and improve durability , the effect of preventing collapse

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

[0019] The polytetrafluoroethylene separation material of this embodiment has a three-dimensional interconnected pore structure, and is characterized in that the stems surrounding the pores have stem holes. The pore diameter is 100-1000nm, the stem diameter is 50-300nm, and the stem pore diameter is not less than 30nm and less than 100nm. The porosity of the pores is 50%-95%, and the porosity of the stem pores is 15-65%.

[0020] Pore ​​diameter, stem diameter, and porosity were detected by nano-CT.

[0021] The preparation method of described PTFE material, comprises the following steps:

[0022] (1) Preparation of spinning solution: dissolve polyvinyl alcohol in water, add polytetrafluoroethylene emulsion, and mix well;

[0023] (2) Spinning: use high-voltage electrospinning equipment for electrospinning to obtain a uniform nanofiber precursor film;

[0024] (3) Sintering: ①Raise the temperature from room temperature to 90-120°C while maintaining a vacuum state. The vacuu...

Embodiment 2

[0027] The polytetrafluoroethylene separation material in this embodiment has a three-dimensional penetrating pore structure, with stem holes surrounding the pore, the pore diameter is 200±100nm, the stem diameter is 125±75nm, and the stem pore diameter is 50±20nm.

[0028] Wherein (I) the porosity of the pores is 60±10%, the porosity of the stem pores is 55±10%; the total surface area of ​​the stems, stem area:stem hole area=1-15:1.

[0029] Or (II) the porosity of the pores is 60±10%, and the porosity of the stem pores is 55±10%; the total surface area of ​​the stem, stem area:stem hole area=16-30:1.

[0030] Or (Ⅲ) the porosity of the pores is 80±10%, and the porosity of the stem pores is 30±15%; the total surface area of ​​the stem, stem area:stem hole area=1-15:1.

[0031] Or (IV) The porosity of the pores is 80±10%, and the porosity of the stem pores is 30±15%; the total surface area of ​​the stem, stem area:stem hole area=16-30:1.

[0032] Stem surface area image analy...

Embodiment 3

[0040] The polytetrafluoroethylene separation material in this embodiment has a three-dimensional penetrating pore structure, with stem holes surrounding the pore, the pore diameter is 200±10nm, the stem diameter is 125±10nm, and the stem pore diameter is 45±5nm.

[0041] Wherein (I) the porosity of the pores is 60%, and the porosity of the stem pores is 55%; the total surface area of ​​the stem, stem area:stem hole area=7:1.

[0042] Or (II) the porosity of the pores is 60%, and the porosity of the stem pores is 55%; the total surface area of ​​the stem, stem area:stem hole area=23:1.

[0043] Or (Ⅲ) The porosity of the pores is 80%, and the porosity of the stem pores is 30%; the total surface area of ​​the stem, stem area:stem hole area=7:1.

[0044]Or (IV) The porosity of the pores is 80%, and the porosity of the stem pores is 30%; the total surface area of ​​the stem, stem area:stem hole area=23:1.

[0045] Porosity of material = porosity of pores + (1 - porosity of pores...

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Abstract

The invention provides a PTFE (polytetrafluoroethylene) separation material. The separation material adopts a 3D communicated pore structure and is characterized in the stem holes are formed in stemssurrounding pores; the porosity of pores is 50%-95% and the porosity of stem holes is 15%-65%. The PTFE material has a special microstructure, stable and firm fiber state and stem hole structure, gooddurability of separation performance and long service life.

Description

technical field [0001] The invention relates to a polymer material, in particular to a polytetrafluoroethylene material, which is used for separation. Background technique [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, and high cost in application, and has not yet been applied ...

Claims

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Application Information

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IPC IPC(8): B01D71/36B01D69/02B01D61/36
CPCB01D71/36B01D61/364B01D69/02B01D2325/02B01D2325/38
Inventor 周涛孙琦叶雷
Owner CHONGQING RUNZE PHARM CO LTD
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