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How should defoamers be used correctly?
Release Date:
2021-08-19
Defoamers come in a wide variety and are primarily categorized into five major series: silicone‑based, higher alcohols, mineral oils, polyethers, and compounded formulations. These defoamers are characterized by rapid defoaming, long-lasting performance, broad compatibility with various media, and robust resistance to harsh conditions such as high temperatures, strong alkalis, and strong acids. They are extensively used to control harmful foam generated in processes across industries including textile printing and dyeing, pulp and paper manufacturing, wastewater treatment, waterborne coatings, and industrial cleaning.
Defoamer They come in a wide variety and are primarily categorized into five major series: silicone‑based, high‑carbon alcohols, mineral oils, polyethers, and compounded formulations. These defoamers are characterized by rapid defoaming action, long-lasting performance, and broad compatibility with various media—even under harsh conditions such as high temperatures, strong alkalis, or strong acids. They are extensively used to control harmful foam generated in processes like textile printing and dyeing, pulp and paper production, wastewater treatment, waterborne coatings, and industrial cleaning.
Proper use of defoamers can enhance their effectiveness. So, how should defoamers be used correctly?
The defoamer manufacturer is here to tell you:
1. Pilot on a small scale first, then expand to a pilot program:
Determine the optimal application and dosage of the product.
2. Mix thoroughly:
Before using the defoamer, the emulsion should be appropriately diluted and then thoroughly stirred until uniform.
3. Short-term use:
To ensure the concentration and defoaming performance of the defoamer, it must be used up within a short period of time.
4. Preventing frost and high temperatures:
Antifoaming agents can affect their performance under freezing and high-temperature conditions.
5. Not shocked:
Strong vibrations can compromise the stability of defoamers.
6. Appropriate viscosity:
Only by maintaining an appropriate viscosity can the performance of the defoamer be fully realized.
From an application standpoint, we naturally seek defoamers that are as easy to handle as possible. Ideally, a single addition of the defoamer to the foaming liquid would eliminate foam throughout the process, providing effective foam control. However, in practice, performance can be subpar in certain industries. This is because a defoamer must act at the liquid–gas interface to disrupt stabilizing agents and thereby suppress foam. During this process, numerous factors can lead to the removal of the defoamer from the surface. In other words, over time, the defoamer may gradually dissolve or emulsify into the liquid, losing its defoaming efficacy. Generally, the rate of dissolution and emulsification of a defoamer depends on several factors: shear forces, the type and concentration of surfactants, temperature, pH, the nature and concentration of solvents, and the presence of certain specific substances.
The dosage of the defoamer varies depending on the specific application, but it is recommended that the active ingredient concentration be no less than 10 ppm.
Addition of defoamer: Before adding to the foaming solution, gently shake to ensure the emulsion is uniform. It can also be added directly, or diluted with thickening water prior to incorporation into the foaming solution. However, any diluted defoamer must be used up within the same month.
Therefore, based on the foregoing analysis, it is generally recommended to employ a safe and effective approach: continuously or semi‑continuously adding a low‑concentration defoamer during the production process. This helps prevent foaming and the formation of oily residues on the silicone gel. If an adequate amount of silicone‑based defoamer must be added at the start of operation, care should be taken to avoid over‑addition.
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