The higher the antifoaming performance of the defoamer, the better the foam breaking
As a defoamer, there are two methods of using it: adding it when foaming occurs and adding it in advance to prevent foaming. The amount of addition ranges from a few ppm to 1%, and can be increased or decreased according to the degree of foaming. When adding it in advance, weigh it with a balance and then put it into the corresponding liquid for mixing. Pour 100mL of the adjusted foaming liquid into a 600mL flat-bottomed measuring cylinder with an accurate scale, cover it with a bottle stopper and clamp it on the oscillator for 100 times of oscillation (to ensure that the measuring cylinder is full of foam), and remove it quickly after oscillation. Then the following performance evaluations can be performed respectively. Use a dropper to accurately and evenly add a certain amount of defoamer to the upper port of the measuring cylinder. After adding, start the stopwatch immediately and record the bubble height at different times in time. Repeat 3 times for each sample in parallel. Calculate the average value of its bubble height as the standard for evaluating the performance of the defoamer. The higher the bubble height, the worse the defoaming performance of the defoamer, and vice versa, the better the defoaming performance. Record the foam height at that time, repeat each sample 3 times in parallel, and calculate the average foam height as the standard for evaluating the foam suppression of the defoamer. The higher the foam height, the worse the foam suppression performance of the defoamer, and vice versa.
