Polytetrafluoroethylene hollow fiber membrane

Abstract

The invention provides a polytetrafluoroethylene hollow fiber membrane which comprises a polytetrafluoroethylene material body, wherein polytetrafluoroethylene takes the shape of fiber; the diameter of the fiber is greater than 200 nm and less than or equal to 2000 nm; the polytetrafluoroethylene material body is provided with pore cavities of which the apertures are 10-2000 nm and cavity walls formed by three-dimensional spaces surrounding the pore cavities; the pore cavities are in uniform distribution; the pore cavities are communicated in a three-dimensional manner; the pore cavities are in uniform distribution means that the pore cavities are in uniform distribution in a porous material by any unit-grade volume; and the porosity is greater than or equal to 65%. A specific and definite measurement mode is provided for pore cavity distribution uniformity of the polytetrafluoroethylene hollow fiber membrane, the pore distribution uniformity of the porous material and a multi-stage porous structure of the porous materials is measured by small-unit grade volume, the porous structure is high in uniformity, and thus uniformity consistency of different properties of the porous material can be 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...

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.