The reaction mechanism of defoamer - solubilizing and foam aiding surfactants can cause bubble collapse
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Some low molecular substances which can be fully mixed with the solution can solubilize the bubble surfactant and reduce its effective concentration. The low molecular substances such as octanol, ethanol and propyl alcohol can not only reduce the concentration of surfactants in the surface layer, but also dissolve the surfactant adsorption layer to reduce the intermolecular tightness of the surfactant, thus reducing the stability of the foam.