Polytetrafluoroethylene fiber tubular film

Abstract

The invention relates to a polytetrafluoroethylene fiber tubular film, which comprises a polytetrafluoroethylene material body, wherein the polytetrafluoroethylene is fibrous, the diameter of the fiber is more than 200 nm and is less than or equal to 2000 nm, the polytetrafluoroethylene material body has pore cavities with a pore size of 10-2000 nm and cavity walls formed by surrounding the pore cavities in a three-dimensional space manner, the pore cavities are uniformly distributed and are communicated in a three-dimensional manner, various pore cavities present the uniform distribution on the porous material under any unit-scale volumes, and the porosity is more than or equal to 65%. According to the present invention, the uniform pore cavity distribution mode of the polytetrafluoroethylene fiber tubular film can be concretely and clearly measured, wherein the pore distribution uniformity of the porous material and the multi-level structure thereof are measured by using the small unit-scale volumes, such that the porous structure is highly uniform so as to ensure the uniformity of various performances of the porous material.

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...

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.