Semi micro Ubbelohde viscometerOperation steps:

Sample preparation: Ensure that the sample is clean and free of impurities to avoid clogging the capillary tube. For polymer solutions, strict filtration is required to remove flocculent substances.

Constant temperature control: During the experiment, it is necessary to strictly control the temperature of the constant temperature bath to ensure the accuracy of the measurement results. The solution needs to be kept at a constant temperature after each dilution before measurement.

Vertical placement: The viscometer should be fixed vertically in a constant temperature water bath to avoid the influence of vibration on the measurement results.

Dilution operation: When directly diluting the solution in the viscometer, it is necessary to ensure that the mixture is uniform after each addition of solvent, and to wash the capillary tube and each ball part to make the concentration of the solution equal throughout the viscometer.

Cleaning and maintenance: After measurement, the viscometer should be repeatedly cleaned with pure solvent and dried for later use. When not in use for a long time, soak it in hot detergent for several hours, then pour out the detergent and rinse it clean with tap water or distilled water.

Notes:

Before use, ensure that the viscometer and the liquid being tested are clean and free of impurities to avoid clogging the capillary tube.

Strictly control the temperature of the constant temperature bath and maintain it constant to ensure the accuracy of the measurement results.

The viscometer should be placed vertically and vibration should be avoided during the experiment to ensure accurate measurement.