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Organosilicone defoamers are an important class of defoamers.
Release Date:
2021-06-17
The defoaming process—both “foam suppression” and “foam breaking”—proceeds as follows: Upon addition of a defoamer to the system, its molecules become randomly distributed across the liquid surface, inhibiting the formation of an elastic film and thereby halting foam generation. When significant foam has already formed, introducing the defoamer causes its molecules to rapidly spread over the foam surface, spreading quickly to create an ultra‑thin bilayer. These molecules then further diffuse and penetrate, infiltrating in a layered manner and ultimately replacing the original thin wall of the foam film.
The defoaming process—both “foam suppression” and “foam breaking”—proceeds as follows: Upon addition of a defoamer to the system, its molecules become randomly distributed across the liquid surface, inhibiting the formation of an elastic film and thereby halting foam generation. When significant foam has already formed, introducing the defoamer causes its molecules to rapidly spread over the foam surface, spreading quickly to create an extremely thin bilayer; these molecules then further diffuse and penetrate, infiltrating in a layered manner and ultimately replacing the original thin wall of the foam film.
Understanding the defoaming mechanism of defoamers:
1. Foam collapse results from a localized reduction in surface tension. This mechanism originates when higher alcohols or vegetable oils are applied to the foam; as they dissolve into the foam liquid, they markedly decrease the surface tension at that specific location. Since these substances typically exhibit low water solubility, the reduction in surface tension is confined to the local region of the foam, while the surface tension surrounding the foam remains virtually unchanged. The area where surface tension has decreased is strongly drawn and stretched outward, leading to rupture.
2. Defoamers can disrupt membrane elasticity, leading to bubble rupture. When added to a foaming system, defoamers diffuse toward the gas–liquid interface, thereby inhibiting the ability of stabilizing surfactants to restore membrane elasticity.
3. Defoamers promote liquid drainage from the liquid film, thereby causing bubbles to rupture. The rate of foam drainage can serve as an indicator of foam stability; adding a substance that accelerates this drainage process can also exert a defoaming effect.
4. The addition of hydrophobic solid particles can lead to bubble rupture. On the bubble surface, these hydrophobic particles attract the hydrophobic tails of surfactants, rendering the particles hydrophilic and enabling them to enter the aqueous phase, thereby exerting a defoaming effect.
Before machining metal workpieces, they undergo a cleaning process. Metal cleaning typically employs chemical, physical, and mechanical methods to remove contaminants and surface residues, thereby enhancing the product’s appearance and quality.
Because many metals require substantial amounts of cleaning agents during the cleaning process, and because no defoamer is used, the high concentration of surfactants in these agents can lead to excessive foaming. This results in incomplete, inadequate, or insufficient cleaning, ultimately compromising both the efficiency and effectiveness of the cleaning operation.
To address the foam generated during metal cleaning, it is necessary to use a detergent specifically formulated for metal cleaning. Silicone defoamer This defoamer exhibits excellent defoaming and foam‑suppressing performance as well as superior resistance to high shear. When incorporated into transparent cleaning formulations, it does not alter the product’s appearance, nor does it cause oil floating, emulsion breakdown, or surface foaming; it leaves no residual film on surfaces and has no adverse impact on subsequent processing steps.
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