Polytetrafluoroethylene hollow fiber membrane

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...

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.