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Why do so many people prefer silicone-based defoamers?
Release Date:
2022-06-20
There is a wide variety of defoamers available on the market, including silicone‑based, polyether‑based, and mineral‑oil‑based types. According to our research, silicone‑based defoamers are used more frequently. So why are they so popular? We’ve summarized the following key characteristics of silicone‑based defoamers:
There is a wide variety of defoamers available on the market, including silicone‑based, polyether‑based, and mineral‑oil‑based types. According to our research, silicone‑based defoamers are used more frequently. So why are they so popular? We’ve summarized the following key characteristics of silicone‑based defoamers:
1. With its insolubility, and owing to the unique chemical structure of organosilicon compounds, organosilicone defoamers do not dissolve in water, vegetable and animal oils, or high‑boiling mineral oils. This characteristic enables their use in both aqueous and oil‑based systems. Not only are they widely applicable and highly effective at suppressing foam, but their foam‑breaking performance is also significantly enhanced.
2. It exhibits low surface tension and strong defoaming and foam‑suppressing performance. Because silicone‑based defoamers contain dimethyl silicone oil of low to medium viscosity, their surface tension ranges from 20 to 21 mN/m—significantly lower than that of water (76 mN/m) and most conventional foaming liquids. This characteristic endows silicone defoamers with powerful defoaming efficacy and a broad range of applications; they not only rapidly eliminate existing foam but also effectively control foam formation.
3. It exhibits excellent thermal stability, with long-term resistance to high temperatures and short-term tolerance of temperatures exceeding 300°C. Even under neutral conditions at temperatures as high as 150°C, it maintains outstanding defoaming performance. Moreover, its key component—methyl silicone oil with an Si–O–Si backbone—remains intact, ensuring that this organosilicone defoamer remains effective across a broad temperature range. Its low dosage not only reduces costs but also avoids contaminating the system or adversely affecting the processing characteristics of the product.
4. High chemical stability and physiological inertness: Due to the relatively stable Si–O and Si–C bonds in organosilicone defoamers, these agents exhibit excellent chemical stability, maintaining superior defoaming performance even in systems containing small amounts of strong acids, bases, or salts, and rarely undergoing chemical reactions with other substances. Furthermore, their physiological inertness allows them to be safely used in industries such as pharmaceutical manufacturing, food fermentation, and personal care products, with no adverse side effects on humans.
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