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PTFE (polytetrafluoroethylene) separation material

A technology of polytetrafluoroethylene and separation materials, applied in the direction of semi-permeable membrane separation, pervaporation, membrane, etc., can solve the problems of difficult structure control, short service period, high use cost, etc., and achieve the same selection efficiency and selection effect Affected, firm fiber form, long-lasting effects

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

[0020] The polytetrafluoroethylene separation material of this embodiment has a three-dimensional interconnected pore structure, which is characterized in that there are stem holes on the stem surrounding the pores; the total surface area of ​​the stem, stem area: stem hole area = 1-30:1 . The pore diameter is 100-1000nm, the stem diameter is 50-300nm, and the stem hole diameter is not less than 30nm and less than 100nm.

[0021] The pore diameter, stem diameter, and porosity are detected by nano-CT.

[0022] Image analysis of stem surface area: Use a scanning electron microscope (SEM photo, magnified 10000-50000 times) to take photos of the material. Scan the photo with an image processing equipment (TV IP-4100II produced by Avionics, Japan, TV image processor provided by Latock System Engineering) to separate the stem and the stem hole to obtain images of the stem and stem hole, and process the image by software , To obtain the respective areas, the ratio of the stem area to th...

Embodiment 2

[0029] The polytetrafluoroethylene separation material of this embodiment has a three-dimensional penetrating pore structure. The stem surrounding the pore has stem holes, the pore diameter is 200±100nm, the stem diameter is 125±75nm, and the stem hole diameter is 50±20nm.

[0030] (I) 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 pore area=1-15:1.

[0031] 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 pore area=16-30:1.

[0032] 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 pore area=1-15:1.

[0033] 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 pore area=16-30:1.

[0034] The preparation method of the PTF...

Embodiment 3

[0041] The polytetrafluoroethylene separation material of this embodiment has a three-dimensional penetrating pore structure. The stem surrounding the pore has stem holes, the pore diameter is 200±10nm, the stem diameter is 125±10nm, and the stem hole diameter is 45±5nm.

[0042] 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 pore area=7:1.

[0043] Or (II) The porosity of the pores is 60%, and the porosity of the stems is 55%; the total surface area of ​​the stems, stem area: stem pore area = 23:1.

[0044] 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 pore area=7:1.

[0045] 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 pore area=23:1.

[0046] Material porosity = pore porosity + (1- pore porosity) * stem p...

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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 ratio of the total surface area of stems to the total surface area of stem holes is (1-30):1. The PTFE material has a special microstructure, stable and firm fiber state and stem hole structure, good durability of separation performance and long service life.

Description

Technical field [0001] The invention relates to a polymer material, in particular to a polytetrafluoroethylene material, used for separation. Background technique [0002] Because of its wide temperature range, PTFE has excellent chemical stability, low friction and insulation properties. The separation membrane material prepared with PTFE as raw material not only has excellent chemical stability and thermal stability. It also has excellent waterproof, windproof, moisture permeability, breathability and stable charge storage. It has shown excellent performance in the manufacture of protective clothing, bag filter, building 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 membranes still have shortcomings such as low flux, low filtration accuracy, easy pollution of membrane pores, and high cost in application, and they have not yet realiz...

Claims

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Application Information

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