Method for detecting hollow fibrous membrane aperture performance

Abstract

The invention discloses a method for detecting hollow fibrous membrane aperture performance, particularly a method capable using method in ASTM F316-03 standards to carry out performance detection on the inner-surface aperture and outer-surface aperture in a hollow fibrous membrane with the advantages of short sample preparation period, low analysis cost, objective and accurate analysis results, and simple operation. According to the invention, the process for detecting the inner-surface aperture performance comprises the following steps: cutting out a small section of the hollow fibrous membrane, sealing one end of the inner bore, and fixing a gas-guide tube communicated with the inner bore of the hollow fibrous membrane at the other end; completely putting the hollow fibrous membrane and the gas-guide tube together in an infiltration liquid to fully infiltrate to be as a sample to be detected for detecting the inner bore performance; putting the sample to be detected in a detection liquid, recording the gas pressure of a first bubble appearing at the sealed end as P2, using the P2 as the bubble point pressure corresponding to the maximum aperture of the inside bore, and calculating the maximum aperture of the inner surface by using the theoretical formula in the ASTM F316-03 standards.

Description

technical field [0001] The invention relates to the technical field of hollow fiber membranes, in particular to a method for detecting the aperture performance of hollow fiber membranes. Background technique [0002] Membrane science and technology, as an emerging discipline, is playing an increasingly important role in the national economy. In recent years, with the expansion of the application field of hollow fiber membrane technology, the requirements for the variety and performance of the membrane are getting higher and higher. Among the various properties of the membrane, people are most concerned about the separation performance and flux of the membrane, and this Both properties are related to the membrane pore size, so it is particularly important to accurately test the membrane pore size and its distribution. [0003] At present, the test standards for the pore size performance in the membrane field mainly include the ASTM F316-03 standard and the HY / T051-1999 hollo...

AI Technical Summary

Problems solved by technology

When testing the aperture of the inner surface, it is necessary to eliminate the resistance error caused by the outer layer and the middle support layer, so that the test results are close to the real value; when testing the aperture of the outer layer, because the outer layer of the fiber is difficult to form a closed space, it cannot Accurately measure the gas from the outer layer of the fiber through the outer hole of the fiber. It is difficult to directly measure the pore size of the outer layer of the fiber. If the gas is measured from the inner surface of the fiber and tested through the outer surface, the inner surface and other membranes cannot be ruled out. The resistance error of other parts of the silk structure also cannot accurately represent the true size of the pore diameter of the outer layer of the membrane.

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