Defoamer testing
methods are divided into dynamic defoaming and static defoaming tests. If your
foaming environment is different, the recommended test methods are different.
There are three main types of foam experiments to characterize the activity of
defoamers. Persistence. As we have different experimental conditions in
different laboratories and the experiments used in our research to obtain
results from existing literature, we will introduce these experiments below.
Other methods are sometimes used depending on the particular application.
1．Ross-Miles
Foam Tester
Features: Tested
for strong foaming environments.
This experiment is widely used for characterization
(1)
Foaming of surfactant solution
(2)
Research and application of foam stability in the presence of defoamer
In the foaming
system, the defoaming performance test was carried out by circulating bubbling
by a Ross-Miles foam meter. In a 2000 mL measuring cylinder, a certain amount
of foaming liquid was added to adjust the flow rate, and foaming was performed
through the foaming liquid. When the foam to be produced rises to the 2000 mL
mark, a quantitative defoamer is added, and the foam elimination time is
recorded. When the foam disappears, the circulation is continued to be bubbled
and the bubble inhibition time of 2000 mL is recorded.
2．Air drum test
Features: Tested
for strong foaming environments.
The foaming liquid
and the defoaming agent were added to a 500 ml measuring cylinder,
constant to a set temperature, and air was bubbled into the set flow rate, and
the volume of the bubble volume (including the sum of the volume of the foam
and the medium) was recorded as a function of time T.
3．Shake flask test
Features: Quickly
identify the quality of defoamers.
The measuring cylinder is used to measure a
certain amount of foaming medium, and the temperature is adjusted to the
specified temperature. The antifoaming agent sample is added, the stopper is
covered, the measuring cylinder is shaken up and down several times at a
certain frequency and swing, and the cylinder is allowed to stand and the
timing is started, and the foam is discarded. The time taken for the liquid
surface to appear, that is the defoaming time of the shake flask.
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