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What factors cause oil floating in defoamers?
Release Date:
2020-12-25
Both conventional working fluids and defoaming systems contain organic and inorganic substances, such as salts, alcohols, acids, and bases. These compounds often have emulsion‑breaking properties. Defoamers are added to the defoaming medium in small quantities, and they are exposed to entirely new and distinct conditions. So, do you know what factors cause oil floating to occur in defoamers? The following explains this phenomenon:
Both conventional working fluids and defoaming systems contain organic and inorganic substances, such as salts, alcohols, acids, and bases. These compounds often have emulsion‑breaking properties. Defoamers are added to the defoaming medium in small quantities, and they are exposed to entirely new and distinct conditions. So, do you know what factors cause oil floating to occur in defoamers? The following explains this phenomenon:
According to Defoamer Industry experts note that defoamers are typically formulated as mixtures, generally comprising a primary defoaming agent, a carrier, and various additives. Depending on the specific type of defoamer, its main components may include silicone oils, polyether compounds, higher alcohols, mineral oils, vegetable oils, and others. Carriers can be water or solvents such as aliphatic hydrocarbons, aromatic hydrocarbons, and oxygen‑containing solvents. Additionally, defoamers often contain auxiliary additives, including thickeners and preservatives.
Polydimethylsiloxane and polyether‑modified polydimethylsiloxane, among others. Due to its excellent resistance to high and low temperatures, stable physical properties, chemical inertness, and low surface tension, silicone is a widely used antifoaming agent.
Defoamers, such as polyacrylic defoamers, achieve selective incompatibility by modulating the polymer’s polarity and molecular weight. When using such defoamers, it is essential to assess their impact on gloss. Our company recommends solvent-based, non-silicone defoamers, which are particularly well suited for coil coatings, two-component polyurethanes, high-viscosity coatings, polyester coatings, and acrylic coatings, offering outstanding defoaming performance.
Generally speaking, a defoamer must be a substance that is insoluble in the foaming medium; it can be dispersed into the foaming medium in the form of droplets, or as droplets encapsulating solid particles, or as solid particles themselves. With a lower surface tension than the foaming medium, the defoamer spontaneously penetrates the liquid film, thereby causing the bubbles to rupture.
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