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How do silicone-based defoamers eliminate foam?
Release Date:
2021-04-02
Silicone defoamers exhibit excellent defoaming and foam‑suppressing performance, owing to their low surface tension, which disrupts the surface tension at the gas–liquid interface and thereby achieves a defoaming effect. Next, we will outline the defoaming mechanisms of silicone defoamers for your reference.
Silicone defoamer It exhibits excellent defoaming and foam‑suppressing performance, which is attributed to its low surface tension. This low surface tension disrupts the interfacial tension at the gas–liquid boundary, thereby achieving a defoaming effect. Next, we will introduce the defoaming mechanisms of certain silicone‑based defoamers for your reference.
When a silicone-based defoamer is added to a foam system, the small particles of silicone oil that land on the foam surface rapidly reduce the surface tension at the point of contact, creating weak spots in the foam skin and thereby causing the foam to collapse.
In practice, the defoaming mechanism of silicone‑based defoamers can be described as follows: Due to the large surface area of the SiO2 filler, even a small amount of silicone oil, when added, rapidly disperses and induces emulsion breakdown and foam rupture at the interface. The localized disruption of adjacent bubbles further destabilizes the emulsion, accelerating the progressive collapse of the foam. In other words, if the emulsion is too stable, the defoaming efficiency diminishes; conversely, when the emulsion is unstable, it exhibits greater reactivity and effectively disrupts the foam. Thus, achieving effective defoaming requires a balance between stability and reactivity, and it is advisable to select silicone compounds that exhibit low solubility in both the aqueous and oil phases while maintaining exceptionally high activity.
Although silicone-based defoamers can be classified into various types—such as oils, solutions, emulsions, solid powders, and composite materials—they all share the following characteristics:
1. Low surface tension, requires a small dosage, and exhibits strong defoaming performance;
2. Exhibits excellent chemical stability and strong antioxidant properties, without compromising the fundamental performance of the foaming system.
3. Silicone antifoams exhibit excellent balance with the surface.
4. Excellent diffusivity, penetrability, and solubility;
5. Resistant to high temperatures and to acids and alkalis;
6. Good gas solubility and permeability;
7. Non-toxic, environmentally friendly, and safe.
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