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What is a defoamer, and how should it be added?
Release Date:
2020-11-16
Defoamers are typically liquid, compounded products, broadly categorized into three main types: mineral oils, organosilicon compounds, and polyethers. Mineral oil defoamers generally consist of a carrier and an active agent. The carrier is a substance with low surface tension, serving to disperse and dilute the formulation; common carriers include water and fatty alcohols. The active agent functions to suppress and eliminate foam, with wax, fatty amides, and fatty acids being frequently used.
Defoamer Most are liquid compound products, primarily categorized into three major types: mineral oils, silicones, and polyethers. Mineral oil defoamers typically consist of a carrier and an active agent. The carrier is a substance with low surface tension, serving to disperse and dilute the formulation. Common carriers include water and fatty alcohols; the active agent functions to suppress and eliminate foam, with wax, fatty amides, and fatty acids being frequently used.
Silicone-based defoamers typically include polydimethylsiloxane, among others. These defoamers exhibit poor solubility and are characterized by rapid defoaming at room temperature and excellent foam‑suppressing performance; however, at elevated temperatures, they tend to delaminate, their defoaming rate slows, and their foam‑suppressing efficacy diminishes.
Polyether defoamers include polyoxyethylene glycol ethers, among others. These defoamers are characterized by long-lasting defoaming, excellent performance, rapid defoaming action, and good thermal stability.
Below, the defoamer manufacturer introduces two common methods for adding defoamers:
1. Addition prior to foaming: This method involves adding a defoamer to systems that are prone to premature foam formation, thereby suppressing foam generation. For closed vessels and equipment, the defoamer can effectively eliminate existing foam.
2. Continuous Dosing: When the foaming liquid is circulating or flowing, the defoamer is consumed along with the liquid’s circulation. In this scenario, continuous dosing of the defoamer can effectively suppress foam, and the use of a metering pump allows precise control of the addition rate, thereby optimizing defoamer usage and achieving cost‑effectiveness.
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