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A Brief Analysis of Defoamer Types and Their Defoaming Mechanisms
Release Date:
2020-11-13
Silicone defoamers typically include polydimethylsiloxane and similar compounds. Due to their low cost and rapid defoaming performance, silicone defoamers are widely used across numerous industrial sectors and currently constitute the mainstream category of defoaming agents.
Defoamer From a compositional standpoint, defoamers are currently classified into three main types: silicone-based, mineral oil–based, and polyether-based. Based on their physical form, they are further divided into liquid and powder defoamers.
According to Defoamer The composition of defoamers is classified, and their mechanisms of action are analyzed, with an examination of the types of defoamers, their performance characteristics, and their application areas.
I. Silicone Defoamer
Silicone defoamer It exhibits strong defoaming performance, moderate foam‑suppressing ability, and poor solubility. At room temperature, it defoams rapidly; however, at elevated temperatures, it tends to separate into layers, its foam‑suppressing efficacy diminishes, and its defoaming rate slows down.
Silicone defoamer It generally includes polydimethylsiloxane, among others. Silicone defoamer Due to its low cost and rapid defoaming performance, it is widely used across numerous industrial sectors and has become the current mainstream choice. Defoamer Product.
II. Polyether Defoamers
Polyether‑based defoamers exhibit relatively weaker defoaming performance compared to silicone‑based defoamers, but they offer superior foam‑suppressing capabilities, long-lasting effectiveness, and excellent thermal stability. Consequently, they are widely used in industrial cleaning applications involving high‑temperature processes. Polyether‑modified silicone defoamers, on the other hand, combine the advantages of both polyether‑ and silicone‑based formulations, making them a mainstream direction in the current development of defoaming agents.
Polyether‑based defoamers typically contain polyoxypropylene, glycerin, and ethylene oxide ethers as their main ingredients. They are commonly used in food products—such as soybean products, beverages, and sucrose—during manufacturing processes. In industrial applications, they are also widely employed for foam suppression and control in areas like papermaking, printed circuit board cleaning, cement mortar production, coatings and inks, and flue‑gas desulfurization in power plants.
III. Mineral Oil Defoamer
Mineral oil defoamers typically consist of surfactants and carriers; the carriers are primarily low‑surface‑tension substances. Common carriers include fatty alcohols and water, which serve mainly to disperse and dilute the formulation. The surfactants, on the other hand, play the key role in suppressing and eliminating foam; frequently used surfactants include fatty acids, waxes, and aliphatic amides.
Analysis of the defoaming mechanism of defoamers
Defoamer There are many factors that influence defoaming, such as disrupting the elasticity of the foam film to cause bubble rupture; reducing the local surface tension of the foam to destabilize it; promoting drainage of the liquid film to collapse the bubbles; solubilizing surfactants to induce bubble breakup; and altering the foam‑formation rate to affect foam stability, thereby achieving defoaming. Additionally, adding hydrophobic components can attract the hydrophobic ends of surfactants, contributing to defoaming. In essence, these are the primary mechanisms underlying defoaming.
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