There are many kinds of water-based defoamers, and R&D personnel in the waterborne material industry such as water-based coatings, inks, adhesives, cleaning agents, cutting fluids, etc. have to do a lot of defoamer evaluation experiments to know whether the defoaming is good or not.
The defoamer evaluation work is a number of repetitive experiments, which greatly occupies the time of R&D personnel and reduces R&D efficiency. The following tips are recommended, and you will know in 2 seconds whether the defoamer is good or not.
The trick is: before the defoamer is evaluated, by looking at the color of the defoamer, the color is appropriately picked out; and then the selected defoamer is compared and evaluated, so as to speed up the selection of the appropriate defoamer with comprehensive performance. Why look at the color can generally know whether the defoamer defoamer is good or not?
Because, experience tells us that the same type of defoamer, when the emulsion particle size is about 10 microns, the defoamer defoamer is better. Different emulsion particle sizes correspond to different emulsion colors, and the emulsion particle size can be roughly known by looking at the color.
Polysiloxane-type defoamer, when the size of the emulsion is about 10 microns, the color of the emulsion is milky white. If the several defoamers to be selected are polysiloxane-type defoamers, the milky white one is preferred.
Polysiloxane type defoamer, the particle size range corresponding to various emulsion colors is as follows:
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