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Expanded polytetrafluoroethylene microporous film, preparation method and treatment method thereof

A polytetrafluoroethylene membrane and polytetrafluoroethylene technology are applied in the field of expanded polytetrafluoroethylene microporous membrane and its preparation and processing, which can solve the problem of increasing the filtration resistance of the microporous membrane, low filtration accuracy, insufficient strength, etc. problems, to achieve the effect of improving tensile strength, high filtration accuracy, and improving operating pressure and life.

Inactive Publication Date: 2017-01-04
SHANGHAI XINGFU ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is to overcome the existing defects of pressure resistance, insufficient strength and low filtration accuracy of the existing expanded PTFE microporous membrane, and to improve the pressure resistance and strength simply by increasing the thickness of the expanded PTFE microporous membrane Not only the cost is high, but also the filtration resistance of the microporous membrane is greatly increased or the flow rate is reduced. An expanded polytetrafluoroethylene microporous membrane and its preparation method and treatment method are provided

Method used

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  • Expanded polytetrafluoroethylene microporous film, preparation method and treatment method thereof
  • Expanded polytetrafluoroethylene microporous film, preparation method and treatment method thereof
  • Expanded polytetrafluoroethylene microporous film, preparation method and treatment method thereof

Examples

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Embodiment 1

[0030] An expanded polytetrafluoroethylene microporous membrane with a cross-sectional structure such as figure 1As shown, it is a flat film, in which the first side 1 is made of 30 layers of air filter membranes, the middle part 2 is a polytetrafluoroethylene film cut long fiber base cloth, and the second side 3 is made of 30 layers of air filter membranes. The average pore diameter of the micropores 4 of the first side part 1 is 3 μm, the average pore diameter of the macropores 5 of the middle part 2 is 1 mm, the average pore diameter of the micropores 4 of the second side part 3 is 0.45 μm, the first side The holes in the part 1 , the middle part 2 and the second side part 3 form a partially three-dimensional through channel structure. The thickness of the expanded polytetrafluoroethylene microporous membrane is 0.3 mm.

[0031] It is prepared by the following preparation method:

[0032] 30 layers of air filter membranes are laminated and laid flat to form the first filt...

Embodiment 2

[0034] An expanded polytetrafluoroethylene microporous membrane with a cross-sectional structure such as figure 2 As shown, it is a tubular film, in which the first side 1 is made of 10 layers of clothing film, the middle part 2 is a polytetrafluoroethylene film cut long fiber base cloth, and the second side 3 is made of 10 layers of clothing film The average aperture of the micropores 4 on the first side is 3.5 μm, the average aperture of the macropores 5 in the middle is 1.2 mm, the average aperture of the micropores 4 in the second side is 1 μm, the first side, the middle and the holes on the second side to form a partially three-dimensional through channel structure. The thickness of the expanded polytetrafluoroethylene microporous membrane is 1.0mm.

[0035] It is prepared by the following preparation method:

[0036] 10 layers of clothing film are wound into a circular tube with an inner diameter of 2cm on the coiler to form the first filter layer; then a polytetraflu...

Embodiment 3

[0038] An expanded polytetrafluoroethylene microporous membrane is a tubular membrane, wherein the first side part is formed by laminating 30 layers of air filter membranes, the middle part is a polytetrafluoroethylene membrane cut long fiber base cloth, and the second side part It is composed of 10 layers of clothing film; the average pore diameter of the micropores on the first side is 5 μm, the average pore diameter of the large pores in the middle is 1.5 mm, and the average pore diameter of the micropores on the second side is 0.45 μm. The holes in the side part, the middle part and the second side part form a partially three-dimensional penetrating channel structure. The thickness of the expanded polytetrafluoroethylene microporous membrane is 0.8mm.

[0039] It is prepared by the following preparation method:

[0040] 30 layers of air filter membranes are wound into a circular tube with an inner diameter of 2cm on the coiler to form the first filter layer; then a polyte...

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Abstract

The present invention discloses an expanded polytetrafluoroethylene microporous film, a preparation method and a treatment method thereof, wherein the first side part and the second side part of the microporous film have a microporous structure, the middle part has a large pore structure, the micropores and the large pores form the partially three-dimensionally penetrating pore channel structure, the middle part is formed from a polytetrafluoroethylene film cut long fiber base cloth, and the first side part and the second side part are formed from a polytetrafluoroethylene microporous film. The preparation method comprises: flattening a polytetrafluoroethylene microporous film or rolling a polytetrafluoroethylene microporous film into a pipe to form a first filtration layer; stacking a polytetrafluoroethylene film cut long fiber base cloth on the first filtration layer to form a reinforcing layer; flatly stacking or rolling the olytetrafluoroethylene microporous film on the reinforcing layer to form a second filtration layer; and sintering the stacked product completing the stacking at a temperature of 350-390 DEG C so as to obtain the finished product. According to the present invention, the thickness of the expanded polytetrafluoroethylene microporous film is 300 [mu]m-1.0 mm, the porosity is 50-65%, the high strength is 200 N, the filtration precision is high, and the bubbling point is more than or equal to 0.2 MPa.

Description

technical field [0001] The invention relates to an expanded polytetrafluoroethylene microporous membrane, a preparation method and a treatment method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) has many advantages, such as high and low temperature resistance, acid and alkali resistance, corrosion resistance, etc., so it is called "the king of plastics". In recent years, unidirectional and biaxially stretched PTFE expanded materials are widely used in gas and liquid filtration, especially the requirements for PTFE microporous membranes are getting higher and higher. PTFE microporous membranes have the defects of pressure resistance, insufficient strength and low filtration accuracy, which limit the application range of expanded PTFE microporous membranes. In the prior art, increasing the thickness of the expanded PTFE microporous membrane is usually used to overcome the above defects, but relying solely on increasing the thickness not only increases...

Claims

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Application Information

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IPC IPC(8): B01D71/36B01D67/00B01D69/04B01D69/06
Inventor 楼曙泱张伟康陆霞
Owner SHANGHAI XINGFU ENVIRONMENTAL PROTECTION TECH CO LTD
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