Polytetrafluoroethylene ultrafine hollow fiber film

Abstract

The invention relates to a polytetrafluoroethylene ultrafine hollow fiber film. The polytetrafluoroethylene ultrafine hollow fiber film comprises a polytetrafluoroethylene material body, polytetrafluoroethylene is in a fibrous state, fiber diameter is 30-200 nm. The polytetrafluoroethylene material body has pore chambers with aperture of 10-1000 nm and a chamber wall formed by surrounding the pore chambers with three dimensions, the pore chambers are uniformly distributed, the pore chamber enables three dimensional penetration, the uniform distribution of the pore chambers means uniform distribution of the pore chambers on a porous material under any unit-grade volume; and porosity amount is more than 70%. The uniform distribution of pore chamber of the polytetrafluoroethylene ultrafine hollow fiber film provides concrete and clear measurement mode, clears porous material under small unit-grade volume size and the pore distribution uniformity of a multistage structure, the porous structure is highly uniform, so that the uniform consistency of each performances of the porous material is guaranteed.

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.