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The working principle of defoamers and precautions for their use
Release Date:
2020-11-11
There is a wide variety of defoaming agents, each applied across numerous industries, and the selection of an appropriate defoamer often varies depending on the specific sector. An excellent defoamer must simultaneously deliver both defoaming and foam‑inhibition performance—quickly breaking existing foam while also preventing new foam from forming over an extended period. Next, we will provide a detailed overview of the primary mechanisms by which defoamers work, along with key precautions for their safe and effective use.
Defoamer There is a great variety of types, and they are also used in many industries; moreover, for different industries… Defoamer The choices also differ. An equally effective defoamer must simultaneously deliver both defoaming and foam‑inhibiting performance—meaning it should not only rapidly break existing foam but also prevent new foam from forming over an extended period. Next, we will provide a detailed introduction to… Defoamer Let’s discuss its main operating principle and the precautions to take when using it!
Working principle of defoamers:
Any factor that can disrupt foam stability can be utilized. Defoamer Defoamers must be liquids that readily spread across the solution’s surface. As such a liquid spreads, it carries away a thin layer of solution from the adjacent surface, locally thinning the liquid film; this leads to film rupture and foam destruction. In general, the faster a defoamer spreads on the solution’s surface, the thinner the film becomes, quickly reaching a critical thickness, thereby accelerating foam breakdown and enhancing the defoaming effect. Typically, liquids that can spread on the surface and exert a defoaming action possess low surface tension, adsorb readily at the solution–air interface, reduce local surface tension, and induce an imbalance that causes the foam to collapse.
Defoamer Precautions for use:
1. When diluting the defoamer, add water to the defoamer and stir slowly.
2. Since the emulsion exhibits optimal stability at its original concentration, the diluted emulsion must be used up within a short period.
3. Before use or sampling, the emulsion must be thoroughly mixed.
4. Oil-in-water emulsions can be diluted to any extent, but this also causes a sharp decline in emulsion stability, potentially leading to phase separation.
5. The defoamer emulsion is highly sensitive to frost and temperatures above 40°C, making it prone to degradation.
6. Prevent frost damage! Emulsions that have already frozen can be carefully thawed, but they must be tested before further use.
7. Prolonged vigorous shaking, intense shearing (e.g., using mechanical pumps, homogenizers, etc.), or stirring can destabilize the emulsion.
8. Increasing the viscosity of the emulsion or adding a thickener can enhance its stability.
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