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What conditions must an effective defoamer meet, according to defoamer manufacturers?
Release Date:
2021-05-31
Defoamers are of great importance in industrial applications due to their excellent defoaming performance. The following are the criteria that an effective defoamer should meet.
Defoamer manufacturer What conditions must an effective defoamer meet?
Defoamers are of great importance in industrial applications due to their excellent defoaming performance. The following are the criteria that an effective defoamer should meet.
(1) It must possess higher surface activity than the foaming surfactant, meaning it must exhibit a lower surface tension.
(2) The foaming medium must be insoluble (or at least partially insoluble); otherwise, it will act as a surfactant, thereby stabilizing the foam.
(3) The droplet size of the defoamer should be within the range of the foam lamella thickness.
Defoamers exhibit strong defoaming performance, low surface tension, excellent spreading properties, and superior penetration, making them indispensable in industrial applications.
1. Application method:
Silicone oil and silicone‑oil–silica white carbon black composites—such defoamers generally cannot be added directly to the foaming liquid. Instead, they can be applied to the nozzle of the bottling machine, to the top of the container or to the inner edge of its upper portion, or they may be coated onto metal mesh, gauze, or glass wool and placed on the surface of the foaming liquid. A common method for preventing foam is to use an organic solvent, followed by diluting or emulsifying the appropriate solvent in water.
2. Solvent method:
Adding silicone fluids or silicone‑carbon black composites directly to aqueous systems results in poor dispersion and limits their effectiveness. Dissolving silicone products in hydrophilic solvents—such as ethylene glycol, glycerol, or other lower‑alcohol solvents—or, in some cases, in higher‑alcohol–phenol mixtures that are only slightly soluble in water—can yield liquid droplets of a certain degree of dispersion, thereby imparting defoaming action. However, this straightforward and convenient approach has not been widely adopted. On the one hand, the use of large quantities of solvent increases costs; on the other hand, without vigorous stirring, the solvent tends to disperse readily, while the silicone may coalesce in situ into oil droplets that lack defoaming activity and have excessively large particle sizes.
3. Emulsification method:
Over the past few decades, the widely accepted and permitted approach has been to emulsify polysiloxane liquids to produce defoamers for aqueous systems.
The cutting fluid defoamer is highly soluble in water and exhibits excellent resistance to high temperatures and to both acids and alkalis; it does not float on the surface.
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