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A kind of polytetrafluoroethylene microfiber tubular membrane

A polytetrafluoroethylene, tubular membrane technology, applied in the field of porous materials, can solve the properties of polytetrafluoroethylene porous membrane materials such as strength, elastic modulus, non-uniform flux, inability to meet application performance, and irregular pore structure. It can achieve the effect of bright and smooth luster, uniform consistency and good penetration.

Active Publication Date: 2021-01-26
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 uniformity is still the uniformity at the large volume scale. If it is measured with a small volume scale, for example, a plurality of three-dimensional bodies whose volume is not larger than one cubic centimeter are randomly selected on the material, and their volumes are measured respectively. Quality, the difference in uniformity is still very large, so the various properties of PTFE porous membrane materials such as strength, elastic modulus, flux, etc. are not uniform, which seriously affects its function.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The polytetrafluoroethylene fiber tubular membrane of the present invention has a secondary 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 The stage holes also penetrate each other, and the penetration is three-dimensional. Each level of porous material in the material body is a continuous structure. The total effective porosity is 75%, the fiber diameter is 150±20 nm, the average pore diameter of the large pores is 0.45 μm, and there are through small holes with an average pore diameter of 30 nm on the wall of the large pores.

[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 absolute value of the...

Embodiment 2

[0038] The polytetrafluoroethylene fiber tubular membrane of the present invention has a three-level pore structure, wherein the uniformly distributed and interpenetrating first-level cavities have second-level cavities evenly distributed and interpenetrating on the cavity wall, and the two The stage holes also penetrate each other, and the penetration is three-dimensional. Each level of porous material in the material body is a continuous structure. The total effective porosity is 85%, the fiber diameter is 180±20 nm, and the average pore diameter of macropores is 1000nm. Tertiary pores with an average pore diameter of 10nm.

[0039] 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 expressed as a percenta...

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Abstract

Provided is a polytetrafluoroethylene fiber tubular membrane, comprising a polytetrafluoroethylene material body; the polytetrafluoroethylene has a fiber shape and the fiber has a diameter of 30-200 nm; the body has pore cavities of a pore diameter of 10-1000 nm and cavity walls formed by three-dimensional spaces surrounding the pore cavities; the pore cavities are uniformly distributed and each pore cavity is three-dimensionally open; the pore cavities being uniformly distributed means that the pore cavities are uniformly distributed over any unit volume on the porous material, the porosity is 65% or higher, and the light transmittance is 45% or higher.

Description

technical field [0001] The invention relates to a porous material, in particular to a polytetrafluoroethylene fiber tubular 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 s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/36B01D69/04
CPCB01D69/04B01D71/36
Inventor 叶雷
Owner CHONGQING RUNZE PHARM CO LTD
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