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Ultrafiltration membrane average pore size determination method

A technology of average pore size and measurement method, which is used in measurement devices, suspension and porous material analysis, instruments, etc., can solve problems such as difficult standard particle method measurement, and achieve the effect of improved measurement efficiency, high accuracy and fast measurement process.

Active Publication Date: 2013-07-31
上海斯纳普膜分离科技有限公司
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Problems solved by technology

[0011] To sum up, in various types of ultrafiltration membranes, on the one hand, for ultrafiltration membranes with relatively small pore diameters, the measurement results of the standard particle method are only of reference value; for ultrafiltration membranes with relatively large pore diameters, then It is difficult to use the standard particle method to measure; on the other hand, if the bubble point method is used to measure the average pore size of the ultrafiltration membrane, although the operation is relatively simple and convenient, there are two technical difficulties mentioned above

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Embodiment Construction

[0021] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to describe the technical solution of the present invention in detail.

[0022] The ultrafiltration membrane bubble point tester of the present invention includes an average pore size bubble point pressure measurement module similarly to the existing bubble point tester. The working principle of the average pore size bubble point pressure measurement module is as described in the background technology. With the continuous increase of the air pressure in the air chamber, the module will continuously test all the components in the air-ventilating state (bubbling state) on the ultrafiltration membrane to be tested. ) to detect the total ventilation air flow of the micropores, and continuously compare the air flow obtained by detection with a preset judgment standard, once the air flow reaches the preset judgment standard, it is judged that the air flow at this ti...

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Abstract

The invention discloses an ultrafiltration membrane bubble point determinator and an ultrafiltration membrane average pore size determination method. The ultrafiltration membrane bubble point determinator comprises an average pore size bubble point pressure determination module used for detecting the air flow of ventilation micropores in an ultrafiltration membrane, and the current air pressure in an air chamber of the ultrafiltration membrane bubble point determinator is judged to be an average pore size bubble point pressure when the air flow reaches a criterion, wherein the criterion is asfollows: the air flow is 8-10ml / min. By applying the determinator and the method provided by the invention, the average pore sizes of the ultrafiltration membranes with larger pore sizes can be rapidly and accurately determined.

Description

technical field [0001] The invention relates to the measurement of structure-related parameters of an ultrafiltration membrane, in particular to an ultrafiltration membrane bubble point tester and a method for measuring the ultrafiltration membrane average pore diameter realized by the ultrafiltration membrane bubble point tester. Background technique [0002] Morphological characterization of porous membranes includes structure-related parameters as well as permeation-related parameters. Structural parameters mainly include: pore size (maximum pore size and average pore size), pore size distribution, skin thickness, and surface porosity; and permeability parameters refer to the actual separation parameters of a specific solute by a porous membrane determined by the solute rejection rate measurement. [0003] The microfiltration membrane is a porous membrane with a large pore size, while the ultrafiltration membrane is a porous membrane with a small pore size. Determining t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B13/08G01N15/08
Inventor 楼福乐梁国明徐继平刘光全
Owner 上海斯纳普膜分离科技有限公司
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