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The issue of floating oil in defoamers
Release Date:
2021-03-11
The stability of an emulsion defoamer is achieved through a specific concentration of emulsifiers and stabilizers, applied via a defined processing method. Although the oily phase in an emulsion has a large specific surface area and is thermodynamically unstable, the presence of sufficient emulsifiers and stabilizers renders the emulsion relatively stable. However, if the defoamer is diluted with water or other process fluids, or added to a defoaming system, the stabilizing environment that supports it will be disrupted. In this new environment, the defoamer can readily destabilize both the emulsion and the bleaching oil.
In recent years, Defoamer Its development is accelerating rapidly. Many industrial processes on the market require the use of defoamers, but there is a problem: why do defoamers sometimes produce an oily film on the surface?
The stability of an emulsion defoamer is achieved through a specific concentration of emulsifiers and stabilizers, applied via a defined processing method. Although the oily phase in an emulsion possesses a large specific surface area and is thermodynamically unstable, the presence of sufficient emulsifiers and stabilizers renders the emulsion relatively stable. However, if the defoamer is diluted with water or other process fluids, or added to a defoaming system, the stabilizing environment that supports it will be disrupted. In this new environment, the defoamer can readily destabilize both the emulsion and the bleaching oil.
Both conventional working fluids and defoaming systems contain organic and inorganic substances, such as salts, alcohols, acids, and bases. These compounds typically have emulsion‑breaking properties. Defoamers are added to the defoaming medium in small quantities, and they are subjected to entirely new and distinct conditions. If the defoamer is of low technical quality and incorporates ordinary or inappropriate emulsifiers and co‑emulsifiers, it can readily destabilize the emulsion. When diluted with water, the resulting formulation may exhibit low viscosity and poor stability; moreover, vigorous stirring after dilution can further induce emulsion breakdown. The floating oil droplets are often no larger than the tip of a needle, with diameters less than 1 mm. Some of these oil droplets remain undispersed for extended periods, while others disperse over time, leaving behind a thin oily film on the water surface; in some cases, the oil even adheres to the walls of the container holding the aqueous dispersion.
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