Determination of general properties of PP filter element microfiltration membrane

Determination of general performance of PP filter element microfiltration membrane (1) Membrane defect Membrane defect refers to the existence of pores in the surface or deep layer of the membrane, and its existence has a direct impact on the performance of the membrane, so the defective membrane should be removed before use. Defective films can generally be inspected visually or with the aid of a microscope, and can also be determined by bubbling by immersing them in water (or a non-solvent for the film). (2) The film thickness is generally measured by a spiral micrometer or a thickness gauge, and can also be measured visually under a microscope or electron microscope. (3) The measurement of the apparent density of the film generally adopts the weighing method to first weigh the film, and then calculate the volume according to the measured film thickness and inner and outer diameter data. The ratio of the two is considered to be the apparent density of the film. (4) Determination of porosity Characterization of separation performance of PP filter element microfiltration membrane Determination of retention rate (1) The important separation mechanism of PP filter element microfiltration membrane is the sieving mechanism, and the index to characterize the separation effect is the retention rate, which means that it can be retained by the membrane The ratio of the amount of a specific macromolecule to the total amount of that specific macromolecule in solution. (2) Molecular weight cut-off is generally defined as molecular weight cut-off with a cut-off rate greater than 90%. Obviously, the higher the rejection, the better the membrane with a narrower rejection range. Commonly used reagents for the determination of retention rate and retention range are: proteins, polyethanol and glucose.
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