Polytetrafluoroethylene hollow fiber membrane

A polytetrafluoroethylene and fiber membrane technology, which is applied in the field of porous materials, can solve the properties of polytetrafluoroethylene porous membrane materials such as strength, elastic modulus, uneven flux, inability to meet application performance, and irregularity of pore structure. and other problems, to achieve the effect of bright and smooth luster, uniform consistency and good penetration.

Inactive Publication Date: 2017-05-17
CHONGQING RUNZE PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the randomness and irregularity of the pore structure, it still cannot meet the performance requirements of many applications.
[0004] In many applications, it is required that the porous material itself is uniform, the pore size and the distribution of the pores are uniform, so that the performance is uniform, but in fact, many porous materials do not meet this requirement, and their uniformity complements; although some materials claim to be Higher uniformity has been achieved, but its unif

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The polytetrafluoroethylene hollow fiber membrane of the present invention has a two-stage pore structure, wherein the uniformly distributed and interpenetrating first-stage cavities have second-stage cavities evenly distributed and interpenetrating on the cavity wall, and the two-stage The holes also communicate with each other, and the communication is a three-dimensional communication. Each level of porous material in the material body is a continuous structure. The total effective porosity is 70%, the fiber diameter is 500nm±20nm, the average pore diameter of the macropore is 1000nm, and there are through small holes with an average pore diameter of 50nm on the wall of the macropore.

[0025] Take 9 three-dimensional bodies of the same size of 10mm × 10mm × 10mm on the porous material by mechanical processing method, and use the Mettler-Toledo XP26 Microbalance balance to test its quality. The results are shown in Table 1. Among them, relative to the average The ab...

Embodiment 2

[0037]The polytetrafluoroethylene hollow fiber membrane of the present invention has a three-stage pore structure, wherein the uniformly distributed and interpenetrating first-stage cavities have second-stage cavities evenly distributed and interpenetrating on the cavity wall, and the two-stage The holes also communicate with each other, and the communication is a three-dimensional communication. Each level of porous material in the material body is a continuous structure. The total effective porosity is 80%, the fiber diameter is 700±20 nm, and the average pore diameter of macropores is 1500nm. Tertiary pores with an average pore diameter of 10nm.

[0038] Take 9 three-dimensional bodies of the same size of 10mm × 10mm × 10mm on the porous material by mechanical processing method, and use the Mettler-Toledo XP26 Microbalance balance to test its quality. The results are shown in Table 1. Among them, relative to the average The absolute value of the deviation of the value is ...

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Abstract

The invention provides a polytetrafluoroethylene hollow fiber membrane. The hollow fiber membrane is prepared from a polytetrafluoroethylene material body, wherein the polytetrafluoroethylene is fibrous, and the fiber diameter is more than 200nm and less than or equal to 2000nm; the body is provided with pore cavities having a pore diameter of 10-2000nm and a cavity wall which encloses the pore cavity in a three-dimensional way; the pore cavities are uniformly distributed under an arbitrary unit-level volume on a porous material, and penetrated in a three-dimensional manner; and the porosity is 65 percent or over, and light transmittance is 45 percent or over. According to the polytetrafluoroethylene hollow fiber membrane, a specific and definite measurement mode is provided to uniform pore cavity distribution, a porous material and the pore distribution uniformity of the multi-stage structure of the porous material are measured by the scale of small-unit volume, so that the porous structure is highly uniform, and the uniformity of each performance of the porous material is ensured.

Description

technical field [0001] The invention relates to a porous material, in particular to a polytetrafluoroethylene hollow fiber membrane. Background technique [0002] A solid with a certain number of pores is called a porous material, which is a material with a network structure composed of through or closed pores. Compared with continuum materials, porous materials generally have the advantages of low relative density, high specific strength, high specific surface area, light weight, sound insulation, heat insulation, and good permeability. According to the different pore sizes, porous materials can be divided into microporous (pore diameter less than 2 nm) materials, mesoporous (pore diameter 2-50 nm) materials and macroporous (pore diameter greater than 50 nm) materials. [0003] Porous materials can be divided into metal porous materials and non-metal porous materials according to their materials. Non-metallic porous materials generally have the characteristics of large sp...

Claims

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Application Information

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IPC IPC(8): B01D71/36B01D69/08
CPCB01D69/08B01D71/36
Inventor 叶雷
Owner CHONGQING RUNZE PHARM CO LTD
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